Patent Grant
8978226
The invention relates to a hand tool, and more particularly, a hand tool for use in the quick disconnect of a quick connect/disconnect coupling.
Quick connect/disconnect couplings are commonly used to connect pipes and tubing in many fields from automobiles and trucks to waterlines. Although easy to connect, the disconnection requires that the release ring on the connector be recessed simultaneously with the removal of the conduit in the opposite direction. This can be a problem when the connectors are placed in inaccessible areas.
Although many devices have been patented for stripping the ends of electrical wires, such as U.S. Pat. No. 4,951,529, to Andre Laurencot; and U.S. Pat. No. 4,475,418 to Isamu Tani none have addressed the issue of removing a quick connector from a conduit. U.S. Pat. No. 6,314,629 to Darren Kady, disclosed a tool for the easy removal of quick disconnect connectors from conduits however these tools are unable to handle over five eights (⅝″) and above diameters. Also, they are unable to handle many of the new slim line style quick connect/disconnect couplings for the plumbing industry.
The disclosed hand tool grasps and moves the conduit in the opposite direction from the release ring on the connector, easily removing the large connectors from the conduit.
A tool for the removal of connectors from pipes is disclosed that, in one embodiment, enables the removal of connectors from large pipes and in another embodiment from a size range of pipes. The body of the tool has a body divided into a gripping portion, having a first and second end, and a pusher portion, having a first and a second end. A pair of handles, a first connected to the second end of the gripping portion and a second to the second end of the pusher portion. In some embodiments the second handle, and connected pusher element, is stationary, while in others both handles, as well as the pusher and gripper elements, are movable.
At the first end of the gripping portion is the gripping element which consists of an arced movable gripping jaw and an optionally arced stationary gripping jaw. Both the stationary gripping jaw and the movable gripping jaw have gripping surfaces that are parallel to the circumference of the pipe. The gripping surface of the movable gripping jaw, and optionally the stationary gripping jaw, preferably have surfaces that have been roughened by at least one of undulations, pointed rows, multiple randomly placed pyramids, pointed columns, natural or synthetic coatings. The movable gripping jaw is connected to a linkage, connecting the jaw to the first handle.
In some embodiments the gripping portion and pusher portion are connected through a pivot connection for rotatability. A spring connected to the handles maintains the handles at a maximum separation distance thereby maintaining the first ends of the gripping portion and pusher portion adjacent one another.
The pusher portion has at its first end a pusher element that consists of an arced stationary pusher jaw and arced movable pusher jaw. Both the stationary pusher jaw and the movable pusher jaw have holding surfaces that are flat and parallel to the circumference of the pipe. The outer face surface of both the stationary pusher jaw and the movable pusher jaw are on the same plane in order to contact the connector ring, or connector, evenly and simultaneously. The holding surface of the stationary pusher jaw is on the same plane with the stationary gripper jaw to prevent angling of the pipe during connector removal. To facilitate removal of the movable pusher jaw from the pipe, the tip of the pusher jaw is preferably angled with respect to the pipe. The angle should be such that the pipe does not catch on the edge of the tip.
The holding surface and the gripping surface have a hardness greater than the hardness of said pipe.
To limit the rotation of the movable pusher jaw a stop a-step is used with a spring being used between the rotating pusher jaw and the pusher portion to return the rotating pusher jaw to a closed position. The connection point between the movable pusher jaw and the pusher element is dimensioned to avoid contact with the connector sealing ring and ensure even pressure is applied.
In the tool designed for a range of smaller size pipes, from ⅛ to ⅜, the arced holding surface of said movable pusher jaw is dimensioned to have at least 10% of the arced holding surface in contact with the pipe adjacent to the connector. Similarly, the arced gripping surface of said movable gripping jaw is dimensioned to have at least 10% of its gripping surface in contact with the pipe.
When the handles are initially compressed, the movable pusher jaw and movable gripper jaw clamp the pipe between the movable jaws and the stationary jaws. Further compression of the handles causes the gripping element to move away from the pusher element.
An example linkage is an E plate secured within the gripping portion to slide upon compression of the handles. The first end of the E plate receives a gripper tab at one end of the movable gripper jaw and a second end of said E plate receives a connector to the first handle. A guide member, such as a roller or tab, affixed to the gripping portion prevents the E plate from twisting.
In the tool that removes connectors from the large pipes, one inch and above, it is preferable to have a release mechanism on the movable gripper jaw. The release mechanism interacts with a release mechanism receiving area to release the movable gripper jaw from a closed position and relock the jaw in the closed position. An example release mechanism would consist of a release button, a release block and a spring to maintain the release block in a position to lock the movable gripper jaw. Movement of the release button compresses the spring and releases the movable gripper jaw to the open position.
On the tool for larger pipes the arced holding surface of the movable pusher jaw has a width in the range of about 27 mm to about 30.5 mm and preferably in the range of 28 mm to 29.5 mm and a depth in the range of about 13.5 mm to about 16.5 mm and preferably in the range of 14.5 mm to 15.5 mm. The arced gripping surface of the movable gripping jaw has a width in the range of about 20 mm to about 23 mm and preferably in the range of 21.5 mm to 22.5 mm and a depth in the range of about 2 mm to about 6 mm and preferably in the range of about 4 mm. In this size tool at least 23% of the arced gripping surface of the movable pusher jaw and the arced holding surface of the movable gripper jaw contact said pipe.
In some embodiments the gripping portion and the pusher portion can be connected by a bar with at least the gripping portion movable along the bar. The tool can further comprise a bar connection, the bar connection maintaining the gripping portion and said pusher portion slidably connected. In this embodiment at least one of the handles has a compression member to move one handle toward the other along the bar connection and a release member to move the handle away from the other handle.
In an additional embodiment, the pusher and/or gripper portions have a receiving area in the first end that includes a securing member to secure removable pusher and/or gripper elements.
The advantages of the instant disclosure will become more apparent when read with the specification and the drawings, wherein:
The disclosed hand tool is used to remove couplings from tubing, piping or other conduits. These quick connect/disconnect couplings are commercially used to connect tubing in all areas of industry, where the tubing is for air, chemicals or liquids. The structure, method of operation, and methods of connecting to various conduit materials, is well known in the art. The quick connect/disconnect coupling maintains the two conduits securely, and in fluid, and/or air, tight engagement with one another. The fluid can be a liquid such as water, oil, a combustion fuel such as gasoline, or a gas such as air, natural gas, propane, hydraulic fluids or the like. In the manual embodiment, the handle members are hand actuated and through a linkage, such as described in the U.S. Pat. Nos. 4,951,529, 4,475,418 and 2,523,936, actuate the gripping and release members. The tool can be built on the framework of wire strippers, such as disclosed in U.S. Pat. No. 4,951,529, 4,475,418 or 2,523,936, the disclosures of each patent being incorporated herein by reference, as though recited in full.
The phrase “maximum separation distance” as used herein means the fully open position at which the pair of handles are maintained by some form of spring means. At the maximum separation distance the gripping portion first end and the pusher portion first end are maintained adjacent to each other.
The term “arc” as used herein refers to the peripheral contour of a component which is a part of a circle or other curved line, such as an oval.
The term “spring” as used herein means an elastic contrivance or body, as a strip or wire of steel that recovers its shape after being compressed, as for example a leaf spring and a coil spring.
Quick release couplings are made for easy removal, and have expanded from the smaller size hones to larger diameter pipes, such as PVC, Pex, copper and conduits. As the diameter of the pipe increases, so does the difficulty in grasping the pipe and releasing the connector. Further, these larger couplings are frequently used in tight spaces, such as under sinks and within large equipment. The disclosed device enables a user to reach into tight spaces, grip the tubing, and separate the coupling with an easy to use hand tool.
The material of manufacture of the gripping tool should be steel or other durable material as there is a substantial amount of stress placed on the parts. Of specific issue is the movable gripper jaw as the teeth that actually grip the pipe to be removed are formed from this jaw. In order to grip the pipe, the material forming teeth and ridges must be harder that the material being gripped. The determination of the hardness of the materials needed for manufacture for use on a specific material can be through any of the known hardness testing methods. For example, copper pipe will range between 8.0 and 12.0 HS on the Schore's Scleroscope scale and can easily be gripped by any steel used for the tool manufacture. However, if steel pipes are used, the hardness of the tool must exceed the hardness of the pipe. In most applications a D2, heat treated iron alloy metal, such as an amorphous metal, zinc alloy or stainless steel with the appropriate heat treatment process can be used. For materials that are more difficult to grip and therefore prone to slippage, such as copper pipes, a hardened steel 440 heat treated to the heat spec of 50RWC or equivalent provides optimum results. Further, the greater the tension created by the compression spring 112, as noted herein, the faster the contact with the pipe and the greater the gripping pressure prior to separating. The choice of the appropriate metal for the end use will be evident to those skilled in the art.
In all embodiments herein the surfaces of the jaws contacting the pipe must be on the same plane in order for the entire curvature of the jaw to contact the surface of the pipe with equal pressure. The washers used on the conduits has a thickness of about 1/16 of an inch and any areas of uneven contact between the pipe and the jaw can result in increased difficulty in removing the connector or failure to remove pipe from the coupling.
In all designs the arc of movement of the gripper jaws and pusher jaws needs to be on the same plane, thereby causing the two stationary jaws and the two movable jaws to contact the pipe simultaneously. This is especially important on the tool removing the ¾ inch and the 1 inch pipe, however the performance of all sized tools can be affected.
The outer and inner surface of the stationary and movable jaws should be on the same plane in all embodiments. In other words, the outer surface of the movable gripper jaw must be flush, or on the same plane, with the outer surface of the stationary gripper jaw. In turn the inner surface of the stationary gripper (side with teeth) must be on the same plane with the inner surface of the stationary pusher in order not to cause a ratcheting effect of the pipe or conduit. This ratcheting effect will cause the pusher to override the release ring of the coupling resulting in failure to disconnect. The inner surface of the movable and stationary gripper jaws must also be flush with one another, as are the pusher jaws. This enables even pressure on the pipe at all contact surfaces.
The disclosed tool can be used on ⅛-1 inch pipes depending upon the jaw design. The basic body of the tool remains basically and therefore, the body of the tools will only be described in
It will be obvious to those skilled in the art that if the body of the tool is made larger or smaller, the dimensions of all interacting parts must be resized accordingly.
The primary description herein is the removal of the connectors from the pipe. However, the tool can also be used to place pipe into the connector in hard to reach areas. By simply reversing the tool the gripper portion moves the pipe to toward the connector when compressed. This is extremely valuable when the pipes are in difficult to reach places as the design of the handles provides an extension to the user's hand.
The upper section of the tool 100 is divided into a gripping portion 121 and a pusher portion 131 and form the upper portion of the frame elements 120 and 130. The frame elements 120 and 130 are maintained in a rotational relationship with one another through the use of a pivot, or hinge, 108.
The gripping portion 121 comprises moveable gripper jaw 122 and stationary gripper jaw 124. The movement of the moveable gripper jaw 122 must be sufficient to securely grip the pipe (not shown), without creating damage, and prevent movement along the length of the pipe.
The pusher portion 131 carries the movable pusher jaw 132 and stationary pusher jaw 134. The movable pusher jaw 132 must securely contact the pipe and ring (as disclosed hereinafter) while still enabling the pusher jaws 132 and 134 to move laterally along the pipe.
The stationary pusher jaw 134 and stationary gripper jaw 124 are affixed to the pusher plate 136 and gripper plate 126 respectively that provide support and structural strength to the tool 100. Preferably they are affixed through welding or molding, however the stationary pusher jaw 134 and stationary gripper jaw 124 can be affixed to their respective plates through other means known in the art such as screws, rivets, etc.
As the handles 102 and 104 are compressed, in what could be referred to as a first stage, the movable pusher jaw 132 and movable gripper jaw 122 are closed to grip the pipe between the movable gripper jaw 122 and stationary gripper jaw 124 and the movable pusher jaw 132 and the stationary pusher jaw 134. The compression spring 112 is tensioned to maintain the pusher portion 130 and the gripper portion 120 adjacent one another with the compression of the spring 112 first translating into the gripping of the jaws as stated above. Additional compression of the handles 102 and 104, or a second stage of compression, against the resistive force of the compression spring 112, tightly grips the pipe and the pusher portion 130 moves away from the gripping portion 120, separating the connector from the pipe.
The compression spring 112 provides the pressure that translates to the functioning of the gripping portion 120 and the pusher portion 130, with the greater the tension, the faster the opening and more powerful the grip. In order to accommodate the larger diameter pipes, the tensioning spring 112 should have a minimum gauge of about 0.05 mm with about 2 mm maximum. As the tensioning spring 112 affects the strength required to close the handles 102 and 104, and too great a gauge for the spring would make the tool difficult to operate.
Although handles are illustrated in conjunction with the embodiments herein, it should be noted that other means for activating the jaws, as well as other handle designs, can be used. Additionally, the springs that apply pressure to any portion of the tool can be replaced with pneumatics when or other device to apply pressure.
In
The teeth 330 of the stationary gripper jaw 332 must not extend beyond the arc 340 of the stationary pusher jaw 342. An unevenness between the two causes the stationary pusher jaw 342 to jump the thin connector ring 384 (
In these figures the gripping surface 336 is slight rounded. This is one embodiment of gripping surface and will work with softer pipe, such as PVC. However, if the tool is being used with metal pipe, a sharper surface, such as multiple pyramids or pointed ridges, such as illustrated with the stationary gripper jaw 332, is preferred.
The movable pusher jaw 344 and stationary pusher jaw 342 are also illustrated with the stationary pusher jaw 342 attached to, or extending from the pusher plate 136 The movable pusher jaw 344 is dimensioned to receive the pipe adjacent the connector. In order to facilitate receiving the pipe, the tip 350 of the movable pusher jaw 344 is angled, thereby preventing the pipe 380 from catching on the pusher jaw 344.
The stationary pusher jaw 342 and the stationary gripper jaw 332 are illustrated herein as having an arc, however it should be noted that the stationary gripper jaw 332 can be flat, convex or concave as long as it has a biting point that will grip the pipe that does not extend beyond the surface of the stationary pusher jaw 342. As stated heretofore the body of the tool, handle and opening mechanism, is described in conjunction with
In
Many connectors 382, especially at the larger diameters, are provided with a ring 384 adjacent to the pipe 380 to provide a better seal. This ring 384 must be contacted with even pressure in order enable the removal of the connector 382.
In
The release button connector 354 can be seen in this figure extending from the release button 352 through the gripper plate 126. The release button 352 mechanism is described in detail hereinafter.
In
In some applications, the gripping surface can be a natural or synthetic substance, for example rubber, epoxy, or polyurethane, that can prevent the gripper jaws from slipping on the pipe. It will be known to those skilled in the art the appropriate gripping surface based upon the end use.
In
While it is preferable that the width of the gripping surface 1004 fully contacts the pipe in order to provide the appropriate grip on the pipe, it is not necessary. It is important that a sufficient portion of the gripping surface 1004 contact the pipe to hold the pipe surface firmly and prevent slippage. For optimum gripping, the minimum depth A is the same on gripper side M as it is on the opposing gripper side N (not shown). In other words, each side of the movable gripper jaw is preferably the same as the opposing side so that both edges between the gripper side M and gripper side N and the gripping surface 1004, or arc to side transition points, contact the surface of the pipe simultaneously.
To prevent torquing and to obtain the optimal results, the sides of the movable gripper jaw, stationary gripper jaw, movable pusher jaw and stationary pusher jaw are, as described above.
In most uses, the arc 1000 between distal point E and minimum depth A and minimum depth A and proximal point F will be generally equal, however it is not necessary that they be mirror images. In some applications, having distinctly different arcs can be advantageous and will be known to those skilled in the art. The arc 1000 preferably has sufficient contact to enable the contact surface 1004 to firmly grip the pipe.
In order to ensure that the connectors 382 are removed reliably and to eliminate damage to the ring 384, the brace 360 of the movable pusher jaw 344, as illustrated in
In addition to the movable pusher jaw 344 having an arc 370 that enables at least 10%, and preferably at least 50%, of the movable pusher jaw 344 to contact the pipe while lying adjacent to the ring 384, the outer face 390 of the movable pusher jaw 344 must be on the same plane as the outer face 392 of the stationary pusher jaw 342. If the two faces 390 and 392 are out of alignment, the ring 384 will be contacted unevenly and the connector 382 may not be removed.
As with the movable gripper jaw 1002, it is preferable the both the leading and the trailing side of the movable pusher jaw 344 contact the pipe simultaneously. However, the connector will still be easily removed as long as the outer face 390 contacts the connector ring evenly. However, if the inner edge (not illustrated) of the movable pusher jaw 344 contacts the pipe prior to the outer face 390 contacting the pipe, the outer face will not contact the connector ring at the edge and therefore will most likely be unable to remove the connector.
To apply the required even pressure to the connector ring, the arc 370 of the moveable pusher jaw 344 width, between proximal point G and distal point H, is in the range of about 27 mm to about 30.5 mm and preferably in the range of 28 mm to 29.5 mm with a depth D in the range of about 13.5 to about 16.5 and preferably in the range of about 14.5 mm to about 15.5 mm, as illustrated in
As illustrated heretofore, a release button 352 is used to release the movable gripper jaw 334 to enable it to extend around the pipe. The release button 352 is connected to a shaft 824 that extends through the plate 822 via a slot (not illustrated) to engage the release block 826 as illustrated in
The exact dimensions, both length and diameter, as well as the tensile strength, are dependent upon the size and type of the pipe being used and will be known to those skilled in the art.
In order for the plate 822 to remain solidly attached to the brace plate 860, only separated by the depth of the E plate 880, a recessed portion 862 of the brace plate 860 is provided with a depth sufficient to receive the spring 828 and release block 826. Additionally, a receiving hole 864 is placed in the brace plate 860 to receive the end of the spring 828. It will be obvious to those skilled in the art that the depth of the recessed portion 828 must accommodate the release block 826 and that varying the depth of the release block 826 will require a variance in the depth of the recessed portion 828.
It should be noted that although a spring mechanism is used to release the movable gripper jaw, any type of release and relock mechanism can be used and alternate designs will be known to those skilled in the art.
The E plate 880, illustrated within the tool in
The guide can be a channel, ball bearing, tab or other means to prevent the E plate 880 from twisting. The connection member 1002 can be a wire or bar and will be known to those skilled in the art.
The top bar 882 of the E plate 880 has a length in the range of about 10 mm to 17 mm, although the preferred length is about 14 mm. The top bar extension 884, as well as the mid bar extension 886 are in the range of about 8 mm to about 12 mm, with a preferred length of 9 mm. The distance between the top bar extension 884 and the mid bar extension 886 is in the range of about 8 mm to about 18 mm with a preferred distance of about 10 mm. The length of the spine 889 of the E plate 880 is in the range of about 42 to about 48 preferably 46 mm with the bottom extension 888 being at least 6 mm, and preferably about 10 mm. The bottom extension 888 serves as the attachment point for the connection between the handles 102 and 104 and the gripper and pusher jaws.
To close the movable gripper jaw 889 once the connector has been removed, the user squeezes the handles 102 and 104, thereby locking the movable gripper jaw 889 in the closed position.
The movable pusher jaw 900, as illustrated in
In
The removable jaw 2030 has a rotating jaw 2032 that rotates at pivot 2040 to separate the rotating pusher 2034 from the stationary pusher 2036. The stationary pusher 2036 is part of the stationary base 2038 that is configured to fit within the pusher unit 2000. The periphery of the removable jaw 2030 should be such that it forms a close fit within the interior of the receiving area 2010, shelf 2012 and back wall 2008. The leg 2042 of the removable jaw 2030 should be dimensioned to be a friction fit within the receiving area 2010 to enable the shaft to engage force the leg 2042 tightly against the shelf 2012 when the knob 2006 is tightened.
In this embodiment, stationary pusher 2036 has an extension 2048 and the rotating pusher 2034 has a mirror extension 2049. The extensions 2048 and 2049 can be dimensioned fit the appropriate end use. One examples of use for the aforenoted embodiment would be to access the release spring in a fuel filter in designs where the fuel line is locked in position on the fuel filter by a recessed retaining spring. This design is known in the fuel filter art. Another use would be to access the recessed release ring connector design as used in Europe. Europe has two types of connectors being used, one with prongs along the outer rim and one with the recessed release ring. In both designs, releasing the connector requires pressure to be applied to a recessed portion of the connection that is readily accessible through use of the disclosed tool.
It should also be noted that the extension can be incorporated on the tool as described in
The removable jaw 2050 is the same design as removable jaw 2030, with the variation being in the diameter of the extension 2056 of the movable pusher jaw 2052 and extension 2058 of the stationary pusher jaw 2054. As with the other embodiments, and described heretofore, the surfaces of the pusher jaws must have full, flat surface contact with the line or pipe and the teeth of the gripper jaws must not extend beyond the pusher jaws.
As noted above, the embodiments illustrated in
As stated heretofore, the handles and body of the tool can remain the same, with the jaws changing. As illustrated in
The depth dimension on the embodiment in
SV
In
In
In this figure the movable gripper jaw 334 is in the closed position. As can be seen, the spring 828 is pushing the release block 826 upward to maintain the tab 842 in the tab receiving notch 840. Upon release of the locking button the movable gripper jaw 334 swings backward until the tab 870 comes in contact with the top bar extension 884.
As noted heretofore, the E plate 889 used in all size tools is subjected to force at about a 45 degree angle through connector rod 1730 as the handles are squeezed. Due to the angle, the bottom extension 888 of the E plate 889 is pulled outward at the angle matching that of the connector rod 1730. This can eventually bend the E plate 889 and cause the tool to be inoperable. In order to prevent the E plate 889 from bending, a guide 1732 is placed approximate the base bottom extension 888. As the handles are compressed, pulling the connector rod 1730 downward, the E plate 889 is slid downward between the guide 1732 and the back plate 1712, thereby prevent the E plate 889 from buckling.
Although the guide 1732 as illustrated in this embodiment is a roller, any alternate member can be used to retain the E plate 889. The important feature is for the guide 1732 to be spaced from the back plate 1712 slightly more than the thickness of the E plate 889. This prevents any bending of the E plate 889 as it is fully supported on both sides while still enabling the E plate 889 to slide. Alternatively a channel can be used in the body to prevent the E plate from twisting. Other retaining members and methods will be evident as long as the E plate is prevented from twisting while being permitted to slide.
The rotating pusher jaw 1652, as mentioned heretofore, rotates freely in all embodiments. As with the E plate described in
The rotating pusher jaw 1652 has a disc 1660 that extends from the interior surface of the rotating pusher jaw 1652. Extending from the disc 1660 is a pivot 1658 at approximately the center point. At one edge of the disc 1660 is a pusher receiving hole 1656 to receive the end of the spring 1672.
In the tool 1650 an arc 1678 is either molded or milled and is dimensioned to receive the disc 1660 of the rotating pusher jaw 1652. The back plate 1670 of the tool 1650 contains a receiving hole 1674 dimensioned to receive the pivot 1658. The spring 1672, has one end secured in the spring receiving hole 1676 while the other end is placed in the pusher receiving hole 1656. The spring 1672 is, at rest, maintaining the rotating pusher jaw 1652 in the closed position. The tension must, however, not be so great as to make it difficult for the rotating pusher jaw 1652 to open when placed against the pipe.
To limit the swing of the rotating pusher jaw 1652 a stop pin 1654 is positioned to contact the body of the tool 1650. The placement of the stop pin 1654 can vary, depending upon the size of the tool, and will be known to those skilled in the art. Alternatively, other types of stops mechanisms can be used, for example a tab that extends from the bottom of the pusher jaw to interact with the back of the pusher portion, or a tab on the pusher portion that will prevent rotation of the movable pusher jaw.
Relative movement between the upper and lower gripping jaws in all embodiments enables the tool to clamp onto the pipe or conduit, whether one or both jaws move, or whether it is the upper or lower jaw that is movable. The movement of either or both jaws can be achieved in any of the methods well known in the art.
An example of tools 1600 and 1650 having both jaws moving is illustrated in
In
In
This stationary body on a rod also containing a movable body is known in the clamp art and covered under U.S. Pat. Nos. 5,009,134, 4,926,722, 5,222,420 and 5,022,137. The clamps however have inward facing pads and when the handles are squeezed, the two pads come together to make contact. If the portion of the claim is reversed, the stationary and movable bodies move apart, however the pad on the movable body is facing away from the pad on the stationary body. Therefore internal modification of the design must be made in order to adapt the movable gripper. The basic interior design of how the movable body moves and is locked in place, however, can be seen in the forgoing patents. Alternate means of moving and locking the movable gripper jaw can be used, such as a toothed bar and gears, and will be known in the art.
Although the foregoing illustrates represent the preferred embodiments, it should be noted that arcs as used in both the release elements and the gripping members are optional. Any of the embodiments can use all arced surfaces, all flat surfaces or a combination thereof. It is preferable that the foregoing gripping members have either teeth, such as pliers, or some type of non-slide coating that prevents the conduit from slipping. In some instances, it may be beneficial to use both the teeth and a rubber coating and the obvious use of one or the other, or a combination thereof will be obvious to those skilled in the art.
It should be noted that although the description of the action of the hand tool is described as three specific stages, in actual use the motion is smooth and sufficiently rapid to eliminate any separate, specific stages. The mechanism used to translate the movement of the handles to the gripping head, as illustrated herein, is an example of one method and different mechanical methods of translating the movement of the handles to the movement of the head will be obvious. The novelty lies in the gripping and pusher action, rather than how this action is achieved and the motion exchange from handles to air tool will be obvious to those skilled in the mechanical arts.
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| Number | Date | Country | |
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| 20130326854 A1 | Dec 2013 | US |
