Patent Grant
7997171
The present invention relates generally to portable electrical tools and is particularly directed to a screw driving tool of the type which receives a collated flexible strip or belt that contains individual screws, and drives the individual screws into solid objects. The invention is specifically disclosed as a screw driving tool with a collapsible front end to provide the capability to drive screws almost directly into corners of walls. The invention includes two main configurations, the first of which is an integral fastener driving tool, and the second of which is an attachment that can be mounted to the front end of a conventional screw gun.
Portable hand-held screw driving tools have been available from Senco Products, Inc. and DuraSpin Products LLC for several years. These tools typically include a movable front end that was essentially depressed into the remaining portion of the tool by pressing the front end of the tool against a solid object that will receive the screw. The movable portion of the previous tools has been referred to as a movable “nose piece,” which also had a slide body sub-assembly that is fixedly attached to the nose piece, thereby moving the slide body sub-assembly at the same time the nose piece moved, relative to the housing of the tool. As the nose piece and slide body sub-assembly move, a screw is indexed to a drive position, the head of the screw is engaged against the front end of a drive bit, and later the drive bit is rotated to cause the screw to rotate while it is emplaced into the solid object.
The initial movement of the tool could be referred to as a first stage of movement, during which the screw is indexed to the drive position (note that this is for an indexed on advance arrangement), and the drive bit is engaged within the slot or recess of the screw head. During the first stage, the drive bit is not intentionally rotated to any significant amount, perhaps only a small amount so as to ensure its proper alignment into the slot or recess of the screw's head. Then during a second stage of movement, the motor inside the portable tool is energized, and the drive bit is then rotated to drive the screw into the object.
In the previous Senco/DuraSpin tools, these two stages of movement caused the nose piece with slide body sub-assembly to linearly “collapse” into a “feed tube” that itself was fixedly attached to the housing of the portable tool. Since the feed tube was not movable with respect to the housing, the feed tube itself had a dimension that would contact a surface of a wall when the tool was used to drive a screw near the corner of two adjoining walls. The distal (i.e., front) end of the feed tube and the distal (or front) end of the housing were the primary constraints on locating a screw as close to the corner as possible.
Accordingly, it is an advantage of the present invention to provide a portable hand-held screw driving tool that has a collapsible front end that allows the screw driving tool to drive a screw into a corner of two adjoining walls at a position more nearly at the exact corner.
It is another advantage of the present invention to provide a portable hand-held screw driving tool that has a movable feed tube that allows the movable nose piece as well as the movable feed tube to “collapse” into the fixed housing area of the tool, and essentially allow the tool to be placed much closer to the exact corner of two walls.
It is a further advantage of the present invention to provide a portable hand-held attachment for use with a separate screw driving gun, in which the attachment has a movable feed tube that allows its movable nosepiece as well as the movable feed tube to “collapse” into a fixed housing of the attachment, and essentially it allows the attachment to place a screw much closer to the exact corner of two walls.
Additional advantages and other novel features of the invention will be set forth in part in the description that follows and in part will become apparent to those skilled in the art upon examination of the following or may be learned with the practice of the invention.
To achieve the foregoing and other advantages, and in accordance with one aspect of the present invention, a portable fastener-driving tool is provided, which comprises: (a) an elongated housing containing a prime mover device, the housing having a first end and a second end; (b) a first member extending from the first end of the housing, the first member having a third end and a fourth end, in a first, non-actuated state the third end being distal from the first end of the housing and the fourth end being proximal to the first end of the housing; (c) a second member extending from the third end of the first member, the second member having a fifth end and a sixth end, in the first, non-actuated state the fifth end being distal from the third end of the first member and the sixth end being proximal to the third end of the first member; (d) an intermediate drive device that extends between the prime mover device and the second member; wherein: (e) the first member is movable with respect to the housing; (f) the second member is movable with respect to the first member; (g) when in the first, non-actuated state, the first member extends past the first end of the housing such that the third end of the first member is positioned substantially at a first predetermined distance from the first end of the housing, and the second member extends past the third end of the first member such that the fifth end of the second member is positioned substantially at a second predetermined distance from the third end of the first member; (h) when in a second state, as the second member is pushed against a solid object, the first member continues to extend past the first end of the housing substantially at the first predetermined distance between the first end of the housing and the third end of the first member, but the second member moves toward the housing and the first member, such that the fifth end of the second member becomes positioned from the third end of the first member at a distance less than the second predetermined distance; and (i) when in an third state, as the second member continues to be pushed against the solid object, both the second member and the first member move toward the housing, such that the third end of the first member becomes positioned from the first end of the housing at a distance less than the first predetermined distance.
In accordance with another aspect of the present invention, a portable fastener-driving tool is provided, which comprises: (a) a housing containing a prime mover device and an intermediate drive device, the housing having an actuation end; (b) a movable first member extending from the actuation end of the housing, the first member having a first distal end; (c) a movable second member extending from the first distal end of the first member, the second member having a second distal end; wherein: (d) in a first, non-actuated state, the second distal end of the second member is substantially at a predetermined first distance with respect to the actuation end of the housing; and (e) when the tool is actuated by a sufficient force against the second distal end of the second member, the second member begins to move relative to the housing, and: (1) the second member travels through a first stage of movement from the predetermined first distance, and moves relative to the first member, while the first member is substantially prevented by a first mechanism from moving relative to the housing until the second distal end of the second member reaches substantially a predetermined second distance with respect to the actuation end of the housing; and (2) then the second member travels through a second stage of movement from the predetermined first distance and past the predetermined second distance, and the first member moves relative to the housing while overcoming the first mechanism, until the second distal end of the second member reaches substantially a predetermined third distance with respect to the actuation end of the housing, which substantially completes the movement of the second member; wherein the predetermined first distance is greater than the predetermined second distance, and the predetermined second distance is greater than the predetermined third distance.
In accordance with yet another aspect of the present invention, a portable fastener-driving tool is provided, which comprises: (a) a housing containing a prime mover device, the housing having an actuation end; (b) a movable first member extending from the actuation end of the housing, the first member having a first distal end; (c) a movable second member extending from the first distal end of the first member, the second member having a second distal end; (d) a first spring device that tends to oppose movement between the first member and the housing; (e) a second spring device that tends to oppose movement between the second member and the first member; wherein, when the tool is actuated by a sufficient force against the second distal end of the second member: (f) during a first stage of actuation, the second member moves relative to the first member, while being opposed by the second spring device, but the first member does not substantially move relative to the housing due to the first spring device; and (g) during a second stage of actuation, the first member moves relative to the housing, while being opposed by the first spring device.
In accordance with a further aspect of the present invention, an attachment for a separate portable fastener-driving tool is provided, which comprises: (a) a housing containing an open interior space for allowing an external drive device to pass therethrough, said housing having a mating end that allows it to mount to a separate portable fastener-driving tool, and said housing having an actuation end; (b) a movable first member extending from said actuation end of the housing, said first member having a first distal end; and (c) a movable second member extending from said first distal end of the first member, said second member having a second distal end; wherein: (d) in a first, non-actuated state, said second distal end of the second member is substantially at a predetermined first distance with respect to said actuation end of the housing; and (e) when said second distal end of the second member is pressed against an external surface, said second member begins to move relative to said housing, and: (1) said second member travels through a first stage of movement from said predetermined first distance, and moves relative to said first member, while said first member is substantially prevented by a first mechanism from moving relative to said housing until said second distal end of the second member reaches substantially a predetermined second distance with respect to said actuation end of the housing; and (2) then said second member travels through a second stage of movement from said predetermined first distance and past said predetermined second distance, and said first member moves relative to said housing while overcoming said first mechanism, until said second distal end of the second member reaches substantially a predetermined third distance with respect to said actuation end of the housing, which substantially completes the movement of said second member; wherein said predetermined first distance is greater than said predetermined second distance, and said predetermined second distance is greater than said predetermined third distance.
In accordance with a yet further aspect of the present invention, a portable fastener-driving tool is provided, which comprises: (a) a housing containing a prime mover device and an intermediate drive device, the housing having an actuation end; (b) a movable first member extending from the actuation end of the housing, the first member having a first distal end; and (c) a movable second member extending from the first distal end of the first member, the second member having a second distal end; wherein: (d) in a first, non-actuated state, the second distal end of the second member is substantially at a predetermined first distance with respect to the actuation end of the housing, and the first distal end of the first member is substantially at an initial position with respect to the actuation end of the housing; (e) when the tool is actuated by a sufficient force against the second distal end of the second member, the second member moves relative to the housing, the first member moves relative to the housing, and the second member is not prevented from moving with respect to the first member; during these movements, the second distal end reaches substantially a predetermined second distance with respect to the actuation end of the housing, which substantially completes the movement of the second member toward the housing, wherein the predetermined first distance is greater than the predetermined second distance; and (f) after the tool has been fully actuated such that the second distal end of the second member has reached substantially the predetermined second distance with respect to the actuation end of the housing, the force against the second distal end of the second member is removed: (1) then the second member moves relative to the housing such that its second distal end moves away from the actuation end of the housing, while traveling through a first stage of movement from the predetermined second distance toward the predetermined first distance, and the first member also moves relative to the housing such that its first distal end moves away from the actuation end of the housing until the first distal end of the first member arrives substantially at a predetermined third distance from the actuation end of the housing, and then the first member is prevented by a first mechanism from moving substantially further away from the housing; and (2) then the second member continues to moves relative to the housing such that its second distal end moves further away from the actuation end of the housing while traveling through a second stage of movement, until its second distal end reaches substantially the predetermined first distance from the actuation end of the housing, which substantially completes the movement of the second member away from the housing; wherein: (A) the first member continues to be prevented by the first mechanism from moving further away from the housing substantially past the predetermined third distance; and (B) the predetermined first distance is greater than the predetermined third distance, and the predetermined third distance is greater than the predetermined second distance.
In accordance with a still further aspect of the present invention, a portable fastener-driving tool is provided, which comprises: (a) a housing containing a prime mover device and an intermediate drive device, the housing having an actuation end; (b) a movable first member extending from the actuation end of the housing, the first member having a first distal end; and (c) a movable second member extending from the first distal end of the first member, the second member having a second distal end, the second member including a fastener indexing mechanism that operates with a collated strip of fasteners; (d) the intermediate drive device including a drive bit that extends toward the fastener indexing mechanism; wherein: (e) in a first, non-actuated state, the second distal end of the second member is substantially at a predetermined first distance with respect to the actuation end of the housing, and the first distal end of the first member is substantially at an initial position with respect to the actuation end of the housing; (f) when the tool is actuated by pressing the second distal end of the second member against a solid object with a sufficient force to cause the second member to be moved toward the housing: (1) the second member moves relative to the housing; (2) the first member moves relative to the housing; (3) the drive bit engages a first fastener of the collated strip of fasteners and, at the fastener indexing mechanism, separates the first fastener from the collated strip of fasteners to drive the first fastener into the solid object; (4) the second distal end reaches substantially a predetermined second distance with respect to the actuation end of the housing, which substantially completes the movement of the second member toward the housing, wherein the predetermined first distance is greater than the predetermined second distance; and (g) after the tool has been fully actuated such that the second distal end of the second member has reached substantially the predetermined second distance with respect to the actuation end of the housing, the force against the second distal end of the second member is removed: (1) then the second member moves relative to the housing such that its second distal end moves away from the actuation end of the housing, while traveling through a first stage of movement from the predetermined second distance toward the predetermined first distance, and during the first stage of movement the drive bit remains in a position that prevents the collated strip of fasteners from indexing; and (2) after the drive bit becomes clear of the collated strip of fasteners, the second member continues to move away from the actuation end of the housing while traveling through a second stage of movement toward the predetermined first distance, and a second fastener is moved into a drive position during the second stage of movement of the second member.
In accordance with still another aspect of the present invention, an attachment for a separate portable fastener-driving tool is provided, which comprises: (a) a housing having a mating end that allows it to mount to a separate portable fastener-driving tool, the housing also having an actuation end; (b) a movable first member extending from the actuation end of the housing, the first member having a first distal end; and (c) a movable second member extending from the first distal end of the first member, the second member having a second distal end; wherein: (d) in a first, non-actuated state, the second distal end of the second member is substantially at a predetermined first distance with respect to the actuation end of the housing; and (e) when the second distal end of the second member is pressed against a surface of an external solid object, the second member begins to move relative to the housing, and: (i) the second member travels through a first stage of movement from the predetermined first distance, and moves relative to the first member, while the first member is substantially prevented by a first mechanism from moving relative to the housing until the second distal end of the second member reaches substantially a predetermined second distance with respect to the actuation end of the housing; and (ii) then the second member travels through a second stage of movement past the predetermined second distance, and the first member moves relative to the housing while overcoming the first mechanism, until the second distal end of the second member reaches substantially a predetermined third distance with respect to the actuation end of the housing, which substantially completes the movement of the second member; wherein the predetermined first distance is greater than the predetermined second distance, and the predetermined second distance is greater than the predetermined third distance.
In accordance with a yet a different aspect of the present invention, an attachment for a separate portable fastener-driving tool is provided, which comprises: (a) a housing having a mating end that allows it to mount to a separate portable fastener-driving tool, the housing also having an actuation end; (b) a movable first member extending from the actuation end of the housing, the first member having a first distal end; and (c) a movable second member extending from the first distal end of the first member, the second member having a second distal end, and the second member having a fastener indexing mechanism; wherein: (d) in a first, non-actuated state, the first distal end of the first member is positioned substantially at a maximum first distance with respect to the actuation end of the housing, the second distal end of the second member is positioned substantially at a maximum second distance with respect to the first distal end of the first member, and a first fastener is not in a drive position; and (e) in a second, actuated state, the second distal end of the second member is pressed against a surface of an external solid object, such that: (i) the second member travels through a first stage of movement while moving relative to the housing and while moving relative to the first member; (ii) the first member is substantially held in place with respect to the housing by an inhibiting member; and (iii) the second stage thus moves relative to the first stage, and the first fastener is indexed to the drive position by the indexing mechanism, due to the relative movement between the first and second stages; (f) in a third, actuated state, the second distal end of the second member continues to be pressed against the external solid object such that: (i) the second member travels through a second stage of movement while moving relative to the housing; (ii) a physical positioning of the second member now actuates the inhibiting member, which thereby allows the first member to move relative to the housing, and causes the first member to be moved along with the second member, toward the actuation end of the housing; and (iii) as the first and second members both move relative to housing, a drive member of the separate portable fastener-driving tool engages the first fastener, and causes the first fastener to driven into the external solid object.
Still other advantages of the present invention will become apparent to those skilled in this art from the following description and drawings wherein there is described and shown a preferred embodiment of this invention in one of the best modes contemplated for carrying out the invention. As will be realized, the invention is capable of other different embodiments, and its several details are capable of modification in various, obvious aspects all without departing from the invention. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description and claims serve to explain the principles of the invention. In the drawings:
Reference will now be made in detail to the present preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings, wherein like numerals indicate the same elements throughout the views.
The present invention is a screw driving tool that loads a collated flexible strip or belt of individual screws, and drives the individual screws into solid objects. A first illustrated embodiment has a movable nose piece that is attached to a slide body sub-assembly that includes an indexing sprocket to receive the collated strip of screws, and to feed an individual screw into a drive position so that the screw can be driven into the solid object. The movable nose piece and slide body are in a mechanical slidable arrangement with a movable feed tube, which in turn is in a slidable mechanical arrangement with a fixed feed tube that is fixedly attached to the housing that contains the major components of the tool. When the front end of the nose piece is pressed against a solid object, it begins an actuation sequence in which the nose piece is essentially pushed back into the movable feed tube portion during a “first stage” of movement. During this first stage, a screw is placed into the drive position, and the slide body sub-assembly and the screw are then forced back toward a drive bit until the head of the screw abuts the drive bit. In a first mode of the invention, this ends the first stage of movement.
During a second stage of movement, the nose piece continues to be pushed back toward the remainder of the tool, and now the movable feed tube also begins to move relative to the fixed feed tube. This begins the second stage movement, which ends when the movable feed tube essentially collapses entirely into the fixed feed tube region. During this second stage movement in the first mode of the invention, the drive bit is rotated by a prime mover device, thereby rotating the screw so that it is rotatably emplaced into the solid object against which the front end of the tool abuts. In a second mode of the invention, the drive bit can begin rotating the screw as part of the first stage of movement.
At the end of the second stage of movement, the screw is entirely driven into the solid object, and the tool can be removed from the solid object. The movable feed tube is now returned to its “free” or non-actuated position by a coil spring, and also the movable nose piece along with its attached slide body sub-assembly are also moved back to their “free” or non-actuated position, by a different coil spring.
In the first illustrated embodiment, a leaf spring helps to prevent the movable feed tube from substantially moving during the first stage of movement. Once the first stage of movement is completed, the leaf spring is bumped away from a slot that it rests in, which occurs during the second stage of movement, while the movable feed tube is moving relative to the fixed feed tube.
In a second illustrated embodiment of the screw driving tool of the present invention, there is no leaf spring, and a coil spring essentially provides all of the mechanical opposition to prevent substantial movement of the movable feed tube relative to the fixed feed tube during the first stage of movement of the nose piece. A further alternative embodiment could utilize a single two-stage spring that exhibits at least two different spring rates at varying compression displacements. A yet further alternative embodiment could use a different type of latching or mechanical resistance device to oppose the motion of the movable feed tube relative to the fixed feed tube during the first stage of movement, or perhaps an opposing or resisting device that works on a different principle of operation, such as pneumatics, hydraulics, or electricity. For example, a vacuum resisting and return device, or a compressed air resisting and return device could be used, or a combination of a mechanical resisting element and a pneumatic return element could be used. Or, for example, an electromagnetic device such as a solenoid could be used, first to oppose the first stage and/or second stage movement, then to return the movable members to their “free” positions—or a solenoid in combination with a mechanical device that performs one of the two functions of opposition or return. Moreover, other types of springs could be used, for example, such as a wind-up spring motor with an attached cable, or perhaps an elastomeric spring, such as a bungee cord-type of device, particularly for the return mechanism. Furthermore, a compression spring could be used that is not a round coil spring, for example.
Referring now to the drawings,
The housing portion 20 of the tool includes a front housing outer shell structure 22, and a rear housing portion that has a top gripping surface 24 as well as a bottom gripping surface (or set of surfaces) 42, that are also part of the handle portion 40. Housing portion 20 is also sometimes referred to herein as an “elongated housing.” Toward the front of housing portion 20 is a “fixed feed tube” 26, that houses some movable portions of the tool 10, as discussed below. In the illustrated embodiment, the feed tube 26 is fixedly attached to the housing portion 20, and is also sometimes referred to herein as a “first member.” In the illustrated embodiment, a “movable feed tube” 28 is one of the movable elements of the tool, and is also sometimes referred to herein as a “second member.”
The front end portion 30 includes a moveable nose piece 32, which is attached to a slide body sub-assembly 34. Both the nose piece 32 and slide body sub-assembly 34 are moveable in a longitudinal direction of the tool 10, and when the nose piece 32 is pressed against a solid object, the screw driving tool 10 will be actuated to physically drive one of the screws into the solid object, also referred to herein as the “workpiece.” Nose piece 32 has a front surface 36, which preferably has a rough texture such as sandpaper, so that it will not easily slide while pressed against the surface of the workpiece when the tool is to be utilized. In the illustrated embodiment of
The slide body sub-assembly 34 is movably attached to the movable feed tube 28, such that slide body sub-assembly 34 essentially slides along predetermined surfaces of movable feed tube 28. In addition, a slot is formed in movable feed tube 28 to provide a camming action surface (essentially a slotted opening having a curved portion and a straight portion) for a cam roller 70 to traverse as the slide body sub-assembly 34 moves, relative to the movable feed tube 28. This action is used to cause the “next” fastener of the collated strip (see below) to index to a “firing position,” by way of an indexing action of the slide body sub-assembly 34 (which indexing action is internal to the slide body sub-assembly).
Handle portion 40 includes a set of bottom gripping surfaces 42 that can be used by a person's hand to readily grip the handle and not easily slide along the bottom surface of the housing portion 20. Handle portion 40 also includes a trigger 44, which is used to actuate an electrical switch to operate the internal drive mechanisms of the hand-held portable tool 10. In the illustrated embodiment, a power cord 46 is attached at the bottom area of handle portion 40, which provides electrical power to the internal drive mechanism of the tool 10. Note that some fastener-driving tools have a battery sub-assembly to provide the electrical power, which of course can be used with the present invention.
Handle portion 40 also includes a curved guide member 48 that can receive a flexible collated strip of screws, in this case the collated screw sub-assembly 60. The collated screw sub-assembly 60 mainly consists of a plastic strip 62 that has several openings to receive individual screws 64. The overall collated screw sub-assembly is flexible to a certain degree, as can be seen in
Some of the mechanical mechanisms described above for the portable screw driving tool 10 has been available in the past from Senco Products, Inc., including such tools as the Senco Model Nos. DS162-14V and DS200-14V. These earlier tools utilized a fixed feed tube only, and there was no equivalent movable feed tube structure, only a movable slide body 34 and nose piece 32 structure. Some of the components used in the present invention have been disclosed in commonly-assigned patents or patent applications, including a U.S. Pat. No. 5,988,026, titled SCREW FEED AND DRIVER FOR A SCREW DRIVING TOOL; a United States Patent application titled TENSIONING DEVICE APPARATUS FOR A BOTTOM FEED SCREW DRIVING TOOL FOR USE WITH COLLATED SCREWS, filed on Sep. 29, 2004, having the Ser. No. 10/953,422, now U.S. Pat. No. 7,032,482; a United States Patent application titled SLIDING RAIL CONTAINMENT DEVICE FOR FLEXIBLE COLLATED SCREWS USED WITH A TOP FEED SCREW DRIVING TOOL, filed on Oct. 13, 2004, having the Ser. No. 10/964,099, now U.S. Pat. No. 7,082,857; and a United States Patent application titled METHOD AND APPARATUS FOR COOLING AN ELECTRIC POWER TOOL, filed on Dec. 27, 2004, having the Ser. No. 11/023,226.
The main purpose of tool 10 is to drive screws that are provided in the form of the flexible collated strip sub-assembly 60. The individual screws 64 are held in place by a flexible plastic strip 62, and as the screws traverse through the guide member 48, they are ultimately directed toward the front end portion of the tool 30 until each of the screws 64 reaches a “drive” position at 68 (see
When the nose piece 32 is actuated by being pressed against a workpiece (see
The tool 10 can also be configured in an alternative screw-feed actuation mode, in which the lead screw is moved into the firing position at 68 as the nose piece 32 is pressed against the surface of a workpiece; this type of screw-feed actuation can be referred to as “indexed on advance.” If tool 10 is configured for indexed on advance, then the lead screw would not yet be in the position at 68 (as seen on
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The second coil spring 84 is shown in its expanded position in
The movements of the springs are more fully described below in reference to the other figures. Another component visible in
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In this view of
A similar but older version of a Senco/DuraSpin tool is also illustrated in
Tool 110 also can place a screw near a corner. In
As can be seen in
Another construction application in which the present invention can be used is for the installation of windows in buildings. An exterior mount window will typically have an outer flange that mounts from the outside of the building. The tool of the present invention can readily place a screw through this flange into a building's exterior sheathing or cladding, for example, while positioning the screw near a protrusion in the window frame that otherwise can cause a clearance problem when using conventional tools.
Referring now to
The smaller coil spring 80 is illustrated as fitting inside the movable feed tube 28, and against the spring post 82, as illustrated in the earlier views. Spring post 82 also surrounds the outer dimensions of the coil spring 84, which itself fits into the fixed feed tube 26.
Leaf spring 90 is held in place by a screw 92 into a leaf spring block (i.e., a supporting member) 102. A slide tube latch 86 is held in place in the bottom of the movable feed tube 28 by a screw 88, which retains the movable feed tube 28 and its contents within the body of the tool 10.
The tool 10 has another adjustment with regard to how far the screw or other type of rotatable fastener will be driven into a solid object. This is controlled by a depth of drive knob 94, which enters a depth of drive block 96 through a depth of drive coil spring 98, which puts tension on the knob 94. A set of push nuts 104 are used to hold certain other members in place, as discussed below.
Referring now to
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In
The coil spring 280 is shown in its fully compressed position, while the larger coil spring 284 is shown in a position where it has not been substantially compressed at all. This would be at the end of the stage 1 movement for this alternative embodiment 200. In this situation, the coil spring 284 can provide the sole opposition to the beginning of the stage 2 movement. Alternatively, some other type of latching device or other type of mechanical friction device could be used to assist the opposition forces provided by the coil spring 284, if desired.
Referring now to
In
The smaller coil spring 280 is shown in its fully compressed position, while the larger coil spring 284 is shown in a position where it has not been substantially compressed at all. This would be at the end of the stage 1 movement for this alternative embodiment 250. In this situation, the coil spring 284 can provide the sole opposition to the beginning of the stage 2 movement. Although the movable feed tube 278 in
It should be noted here that a single coil spring that extends from the rear portion of the “large” spring 84 all the way to the front portion of the “small” spring 80 could potentially replace the two individual springs 80 and 84. To use this configuration, a positive latching mechanism would be used to prevent the movable feed tube 28 from moving during the “stage 1” movement of the nose piece 36 and slide body sub-assembly 34. Once a screw was properly indexed into the drive position (at 68), the positive latching mechanism would then be allowed to release the movable feed tube from its “confinement,” and then movable feed tube 28 could also be allowed to move “backward” into the fixed feed tube 26, as described above. (This, of course, is for a screwdriving tool that operates as an “indexed on advance” tool.)
Referring now to
A smaller coil spring 380 is illustrated as fitting inside the movable feed tube 328, and against a spring post 368 of a latch block structure 382. The latch block 382 also surrounds the outer dimensions of a second, larger coil spring 384, which itself fits into a fixed feed tube 326. The latch block 382 is held in place within the movable feed tube 328 by a set of screws 342, as illustrated in
A slide tube latch 386 is held in place in the bottom of the movable feed tube 328 by a flat head screw 388, which retains the movable feed tube 328 and its contents within the body of the front portion 300 of the tool. The screw driving tool has another adjustment that controls how far the screw (or other type of rotatable fastener) will be driven into a solid object. This adjustment is controlled by a depth of drive knob 394, which enters a depth of drive block 396 through a depth of drive coil spring 398, which puts tension on the knob 394. A push nut 399 holds the depth of drive coil spring 398 in place.
The fixed feed tube 326 includes a set of “liners” that act as guides for the movable feed tube 328, in which feed tube 328 essentially slides along these guides 306 and 308, into the fixed feed tube 326. A set of push nuts 304 holds these guides 306, 308 in place. In one embodiment of the invention, there are two different types of guides at opposite corners, and the guides are typically made of nylon or some other type of plastic material that has relatively low friction and low wear characteristics. If the fixed feed tube is eliminated and its functions performed by the front housing portion 322, then the guides 306, 308 could be inserted into the housing 322, or the housing itself could act as the linear guides if the housing is made of a proper material.
When the front surface 336 of nosepiece 332 is pressed against a surface (typically a workpiece), the nosepiece 332 will tend to be pushed back into the movable feed tube 328. As that occurs, the cam roller 372 will move through its curved slot 373 in the side wall of the movable nosepiece 332. Moreover, the slide body sub-assembly 334 will move relative to the movable feed tube 328.
A linear actuator 350 is affixed or attached to the slide body sub-assembly 334, near one of its rear corners. Linear actuator 350 essentially is an extension (or a “protruding member”), and has a distal extension portion at 352, and a shorter, intermediate extension portion at 354. The further extension 352 serves as a guide to ensure that the slide body 334 and linear actuator 350 will be “aimed” at the proper target, and thus remain in a proper mechanical orientation during movement toward the movable feed tube 328. As will be seen in other views, this far distal extension 352 will tend to pass beneath a predetermined surface of the latch lever 360. However, the intermediate extension portion 354 of the linear actuator will, at its proper movement position, abut against the predetermined surface of the latch lever 360. When this occurs, the latch lever 360 will be pushed inward (i.e., toward the centerline of the slide body sub-assembly 334 and coil springs 380, 384), and this will also force the leaf spring 364 to be compressed.
As the latch lever 360 is pushed inward, it will clear the edge of the window 344, and once that occurs, the movable feed tube 328 will then be allowed to also move backwards with respect to the fixed feed tube 326. Until this has occurred, the latch lever 360 holds the movable feed tube 328 in a semi-fixed position with respect to the fixed feed tube 326, such that the movable feed tube 328 cannot be pushed backward with respect to the fixed feed tube 326. This is because the latch lever 360 is abutting the rear edge of the opening or window 344 in the fixed feed tube 326. This occurs during the “stage 1” portion of the movement of the slide body sub-assembly 334, and this is similar to the other embodiments discussed above, in which it is not desired to allow the movable feed tube 328 to move with respect to the fixed feed tube 326 while a screw is being indexed into its drive position (when the tool is constructed as an “indexed on advance” configuration).
Once the latch lever 360 has been pivoted sufficiently so that its surface no longer contacts the rear edge of the window 344, the movable feed tube 328 can then be moved with respect to the fixed feed tube 326, and then this allows the “stage 2” movement of the slide body sub-assembly 334 to occur. In general, the smaller coil spring 380 will be compressed during the stage 1 movement, and the larger coil spring 384 will either not be depressed at all, or will be depressed only slightly (this mainly depends on component tolerances of the entire tool assembly). However, once the latch lever 360 has been moved, and the movable feed tube 328 can move with respect to the fixed feed tube 326, this allows the larger coil spring 384 to also be compressed, which occurs during the stage 2 movement.
Referring now to
The linear actuator 350 has its farthest extended portion 352 within a cut-out or opening along the side of the latch block 382. Since the latch block 382 is affixed to the movable feed tube 328, the slide body sub-assembly 334 can move (along with the linear actuator 350) through this cut-out or opening in the latch block 382.
In this relaxed position, the linear actuator 350 is not making contact with the latch lever 360, and thus latch lever 360 is allowed to be in its extended position, such that it has a surface that is abutting an edge of the window (or opening) 340 in the movable feed tube 328. As can be seen in
The latch lever 360 will be “allowed” to extend into these openings 340 and 344 because, when the front portion 300 is in its extended or relaxed position, latch lever 360 it is not being constrained by the linear actuator 350 and the leaf spring 364 can pivot the latch lever “outward” into the window (opening) 340. Also, when in this relaxed or extended position of the front portion 300, the smaller coil spring 380 is relaxed, as is the larger coil spring 384. Moreover, the cam follower 372 is in its initial position within its curved cam slot 373.
Referring now to
Referring now to
While that has been occurring, the movable feed tube 328 has not been allowed to move with respect to the fixed feed tube 326. However, the linear actuator 350 has now been forced back by the motion of the slide body sub-assembly 334 until its intermediate extension 354 has made contact with the latch lever 360. The view of
Referring now to
Referring now to
Referring now to
Referring now to
The attachment 400 mates to the front end of the screw gun 410 by use of a separate adapter 420. Once the attachment 400 has been mounted to the screw gun 410, a collated strip of screws can be used with the screw gun 410, via this attachment 400. The collated strip is not illustrated in this view, but it would slide through a feed rail 430 that is mounted onto pedestals 416 that are mounted to the upper surface of its housing 422. On the lower surface of the housing 422 is a grip area 414, for placement of the user's hand. Attachment 400 includes a depth of drive adjustment knob 496, and also has a depth of drive indicator at 498. The housing 422 thus exhibits a “mating end” near the adapter 420, which receives the front end of the screw gun 410.
During operation, a collated strip of screws (or fasteners) would be fed through the guide rail (or feed rail) 430, from the rear toward the front of the tool attachment 400. As the collated scrip leaves the feed rail 430, it would travel the pathway indicated by the reference numeral 412. It would then enter a slide body sub-assembly 434 which would have an indexing sprocket that will control the positioning of the screws or fasteners that are part of the collated strip of fasteners.
Any one of the “front end” embodiments discussed above with respect to using a movable feed tube of the present invention could be provided in the attachment 400. In the view of
The housing 422 exhibits an “actuation end” at the area in which the movable feed tube 428 is located. Housing 422 also includes an open interior space (not visible in
It should be noted that the front portion of the attachment 400 is essentially an upside-down version of the front end assembly 300 of
Attachments for screw guns have been available for many years, including attachments made by Senco Products, Inc., and DuraSpin Products, LLC, the assignee of the present invention. However, the embodiment 400 is able to have its front portion fit much more tightly into a corner, by virtue of its movable feed tube 428. In other words, it will operate in the same manner as the earlier described embodiments, and will fit into a corner in the same fashion as illustrated by the tool 10 in
Most of the above-described embodiments are based on a screwdriving tool that operates on an “indexed on advance” principle of operation. However, the principles of the present invention also apply to a tool which operates on an “indexed on return” principle of operation. In an “indexed on return” tool, a fastener (e.g., a screw) would be fed to the drive position 68 as the nosepiece 32 and slide body sub-assembly 34 are moving away from the main body of the tool 10, instead of when nosepiece 32 and slide body sub-assembly 34 are moving toward the tool main body. (These reference numerals relate to
An “indexed on return” tool will not need to restrict the movements of the slide body sub-assembly 34 or the movable feed tube 28 while these parts are being pushed into the fixed feed tube 26, as the tool is being actuated to drive a fastener into a workpiece. The fastener/screw will already be in the drive position 68 (as illustrated in
However, upon release from the workpiece, the slide body sub-assembly 34 and nose piece 32 will begin moving away from the fixed feed tube 26, and the bit 66 of the tool will remain in contact with the plastic strip 62 until the slide body sub-assembly 34 moves far enough away from the tool body so that the strip 62 will “clear” the bit 66. During a first stage of movement (i.e., a “stage 1” movement) of the slide body sub-assembly/nose piece, it will be desirable for the movable feed tube 28 to also move away from the tool body/fixed feed tube 26. Typically, the movable feed tube 28 will not be allowed to continue movement past a predetermined maximum distance from the fixed feed tube 26 in this “indexed on return” tool. The stage 1 movement will end when the movable feed tube 28 reaches this predetermined maximum distance.
The movable feed tube must not be allowed to interfere with the “loading” of the “next” fastener from the collated strip 62 into the drive position 68, for the next actuation/operation of the tool as a fastener-driver/screwdriving tool. At some point it is desired for the movable feed tube 28 to become substantially stationary with respect to the tool's housing 22 and fixed feed tube 26 (e.g., at the above-noted predetermined maximum distance) while the slide body sub-assembly continues to move away from the tool housing/fixed feed tube, and thereby allow the indexing sprocket of the slide body sub-assembly to operate its camming action (e.g., like the cam screw 372 in the cam slot 373 in
A set of springs can act as an inhibiting force against movement of the movable feed tube 28 during the stage 2 movement described in the previous paragraph. Alternatively, a mechanical latching mechanism could be used to positively prohibit movement of the movable feed tube 28 during this stage 2 movement. Such devices could be similar to the coil springs 80 and 84, described above, and/or to latching or detent mechanisms such as the leaf spring 90 of
An alternative way of describing the present invention as an indexed on return tool is to define “stage 1” movement as ending when the screw strip 62 clears the bit 66, as the slide body sub-assembly 34 (along with nose piece 32) moves away from the housing 20 and the fixed feed tube 26. The movable feed tube 28 also would likely be moving away from housing 20 and fixed feed tube 26 during this stage 1 movement of the slide body sub-assembly/nose piece.
Once the bit 66 has cleared strip 62, the indexing sprocket in slide body sub-assembly can be rotated to advance the “next” fastener/screw 64 to the drive position 68. The movable feed tube 28 needs to be prevented from substantial movement for a sufficient time to allow the slide body sub-assembly to continue moving away from the housing/fixed feed tube, or at least the movable feed tube 28 needs to be substantially slowed to allow a differential velocity to exist between itself and the slide body sub-assembly 34. This will allow the indexing sprocket to advance the next fastener/screw 64 to the drive position 68, using the camming action of the cam screw 372 in the cam slot 373 in
Note that the movable feed tube 28 can be held in place for the entire duration of the slide body sub-assembly's stage 2 movement, if desired, or the movable feed tube 28 could be allowed to have further movement after the sprocket has advanced the next fastener/screw 64 to the drive position 68. So long as some type of indexing mechanism is able to advance the next fastener/screw to the drive position in some form, the exact movements of the movable feed tube 28 and the slide body sub-assembly 34 do not need to be constrained to a specific pattern, while still falling within the principles of the present invention.
It will be understood that the terminology “feed tube” is one selected by the inventors for the relatively square structures seen in the views. When seen from the front of the tool 10, these structures are essentially hollow “tubes,” but the tubes are not cylindrical. These structures are also sometimes referred to as “members” in other portions of this patent document, particularly in the claims. It will be understood that virtually any shape could be used for these structures, including a hollow cylinder, if desired, without departing from the principles of the present invention. The movable nose piece with slide body sub-assembly are also sometimes referred to as a “member” in other portions of this patent document, particularly in the claims.
One major reason for using both a “fixed” feed tube 26 and a “movable” feed tube 28 in the design of the tool 10 is so that the movable feed tube, perhaps along with the nose piece 32 and slide body sub-assembly 34, can be retrofitted into existing screw-driving tools sold by the assignees, Senco Products, Inc. or DuraSpin Products LLC. In the existing conventional tools, the movable portion (which chiefly consisted of the nose piece and slide body S/A) was installable into a non-movable feed tube that itself was affixed to the housing.
The “fixed feed tube” 26 of the present invention is analogous to the earlier non-movable feed tubes of the earlier Senco/DuraSpin tools. It will be understood that a separate “fixed” feed tube would not always be necessary for the workings of the present invention (see
It will be understood that the principles of the present invention are applicable to many different types of fastener driving tools, including tools powered by AC electrical power (e.g., 120 VAC line power from an outlet), DC electrical power (e.g., from a battery or a solar panel), a pneumatic power source, or a hydraulic power source, for example. In other words, the prime mover device 52 could comprise an electric motor, a pneumatic motor, or a hydraulic motor, for example. In addition, the types of fasteners that can be driven in the manner of the present invention are not limited to screws, but could instead be nails or rivets, for example.
It will be understood that the term “collated screw sub-assembly” as used herein refers to a strip of screws that are temporarily mounted in a flexible strip of material that exhibits openings and other structures to hold the screws in place until they are needed. In many products, the flexible strip of material comprises plastic, but other materials could be used, if desired. The individual screws are advanced to a driving position in a screw driving tool (such as portable tool 10), and each screw is individually driven from the flexible strip by the tool when the tool is actuated.
As used herein, the term “proximal” can have a meaning of closely positioning one physical object with a second physical object, such that the two objects are perhaps adjacent to one another, although it is not necessarily required that there be no third object positioned therebetween. In the present invention, there may be instances in which a “male locating structure” is to be positioned “proximal” to a “female locating structure.” In general, this could mean that the two male and female structures are to be physically abutting one another, or this could mean that they are “mated” to one another by way of a particular size and shape that essentially keeps one structure oriented in a predetermined direction and at an X-Y (e.g., horizontal and vertical) position with respect to one another, regardless as to whether the two male and female structures actually touch one another along a continuous surface. Or, two structures of any size and shape (whether male, female, or otherwise in shape) may be located somewhat near one another, regardless if they physically abut one another or not; such a relationship could still be termed “proximal.” Moreover, the term “proximal” can also have a meaning that relates strictly to a single object, in which the single object may have two ends, and the “distal end” is the end that is positioned somewhat farther away from a subject point (or area) of reference, and the “proximal end” is the other end, which would be positioned somewhat closer to that same subject point (or area) of reference.
All documents cited in the Detailed Description of the Invention are, in relevant part, incorporated herein by reference; the citation of any document is not to be construed as an admission that it is prior art with respect to the present invention.
The foregoing description of a preferred embodiment of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Any examples described or illustrated herein are intended as non-limiting examples, and many modifications or variations of the examples, or of the preferred embodiment(s), are possible in light of the above teachings, without departing from the spirit and scope of the present invention. The embodiment(s) was chosen and described in order to illustrate the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to particular uses contemplated. It is intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
The present application is a divisional application of Ser. No. 11/359,943, titled “PORTABLE SCREW DRIVING TOOL WITH COLLAPSIBLE FRONT END,” filed on Feb. 22, 2006, now U.S. Pat. No. 7,493,839; which claims priority to provisional patent application Ser. No. 60/656,346, titled “PORTABLE SCREW DRIVING TOOL WITH COLLAPSIBLE FRONT END,” filed on Feb. 25, 2005.
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| Number | Date | Country | |
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| Parent | 11359943 | Feb 2006 | US |
| Child | 12131283 | US |
