Patent Application
20150239114
1. Field of the Invention
The present invention relates, in general, to the field of power tools. In particular, the present invention relates to a power tool for setting anchors into a workpiece, such as concrete.
2. Description of the Related Art
Threaded drop-in anchors are usually manually set in concrete by drilling a hole and manually hammering the anchor into the concrete with a setting, tool. The setting tool is generally a male or pin-like tool that is sufficiently narrow to fit within the hole and fully strike one end of or inside of the anchor to set the anchor into the concrete. The setting tool is drive set to the shoulder of the concrete. Each size and type of anchor is installed using a setting tool supplied by its respective manufacturer. Therefore, there is a need in the art for a universal setting, tool capable of retaining bits of various sizes and types and capable of setting various anchors into workpieces.
Existing anchor setting with manual tools such as the pin-like tool and hammer combination are labor intensive. Further, there is a need in the art to accommodate a pin-like tool for continuous strike actions in a high energy level device for setting anchors.
A method and apparatus for retaining tool bits of various lengths and diameters in an impacting setting, tool that allows for a longitudinal translation of the bits. The bits are selectively removable and replaceable depending on the size of the anchor to be set. Thus, the tool sets anchors of various diameters and lengths and from multiple anchor manufacturers. The apparatus is in an electrically powered tool for use in driving the setting pins of threaded drop-in concrete anchors.
In an embodiment of the present invention, a bit retention device includes an upper support member having an inner surface and an outer surface and a lower support member fixed to the upper support member. A stationary plate can be mounted to the inner surface of the upper support member. A clamp plate can be operatively connected to the upper support member and opposing the stationary plate. The upper support member and the lower support member frame the stationary plate and the clamp plate. Also within the frame created by the upper support member and lower support member are a plurality of fixed clamp plate sleeves. The clamp plate sleeves are surrounded by corresponding clamp plate springs that resiliently bias the clamp plate toward the stationary plate.
The upper support member can have an elongated body that extends in a longitudinal direction within the tool housing. The elongated body can have sidewalls with a crenellated profile formed of upright sections and notches
The stationary plate and clamp plate can have a plurality of laterally extending tabs that are arranged alternatingly in the longitudinal direction of the bit retention device, so that the clamp plate can move relative to the stationary plate for accommodating different diameters of tool bits. Additionally, the stationary plate and the clamp plate can have substantially V-shaped cross-sections that open toward each other to form a diamond shape for securing different diameters of tool bits therebetween.
In a further embodiment of the present invention, an anchor setting, tool includes above-described bit retention. The anchor setting tool can include a housing having a handle portion, a transmission portion and a forward portion. The bit retention device can be disposed at least partially within the forward portion for retaining a tool bit in a longitudinal direction and include a stationary plate, and a clamp plate biased toward the stationary plate. The tool further includes a motor powered by a power source, such as, for example, a battery, and a transmission mechanism arranged in the transmission portion and driven by the motor for converting rotary motion of the motor to linear motion of driving striking rod. The striking rod can be disposed in the forward portion between the transmission mechanism and the bit retention device. The striking rod can be moveable in a reciprocating manner from an impact received from the transmission mechanism to strike the tool bit.
A method for retaining a bit in a bit retention device having a longitudinally extending upper support member and a longitudinally extending lower support member encasing a clamp plate spring assembly includes providing a stationary plate mounted to the lower support member; providing a spring-biased clamp plate operatively connected to the upper support member and biased toward the stationary plate; and inserting a tool bit between the stationary plate and the clamp plate to move the clamp plate away from the stationary plate.
The numerous advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying Figures. In the drawings, like reference numerals designate corresponding parts throughout the several views.
Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Referring now more particularly to the drawings,
With continuing reference to
The housing 12 may include a body portion 12a, which may be configured to house the motor 14 and transmission mechanism 414, and a handle 12b. The housing body portion 12a is vertically arranged in the housing 12 and has an upper portion and a lower portion. The lower portion of the housing includes the motor exhaust 17. The handle 12b may be configured to house the control unit 22. The handle 12b may provide the housing 12 with a conventional pistol-grip appearance and may be unitarily formed with the body portion 12a or may be a discrete fabrication that is coupled to the body portion 12a, as by threaded fasteners (not shown). The handle 12b may be contoured so as to ergonomically fit a user's hand and/or may be equipped with a resilient and/or non-slip covering, such as an overmolded thermoplastic elastomer 13.
The trigger 18 may be coupled to the housing 12 and is configured to receive an input from the user, typically by way of the user's finger, which may be employed in conjunction with a trigger switch 18a to generate a trigger signal that may be employed in whole or in part to initiate the cycling of the tool 10 to strike the striking rod 400 and, in turn, the tool bit 20, and anchor (not shown). The setting pin portion 20a is inserted into the anchor such that when the tool bit 20 is struck by the striking rod 400, the tool bit moves longitudinally within the bit retention device 16 to strike the body of the anchor and wedge the anchor into a workpiece, such as concrete.
As shown in
With reference to
As further shown in
Optionally, a pair of inclined slots (not shown) is formed on the rotating shaft 416. An impact wheel 420 is mounted on the rotating shaft 416. Optionally, the impact wheel 420 comprises a pair of guiding slots (not shown) which are formed on its inner wall and opposite to the inclined slots (not shown) respectively. As a further option, a pair of steel balls (not shown) can be arranged movably in two chambers formed by the inclined slots and the guiding slots. When the inclined slots are moved relative to the guiding slots, the chambers formed thereby are moved with a result that the steel balls can be moved along with the chambers. The impact wheel 420 can thus be driven to rotate through the steel balls within the inclined slots when the rotating shaft 416 is rotated.
A pair of projections 422, which extend along the diameter direction of the impact wheel 420, is provided on the periphery of the impact wheel. An energy storing spring 424 is mounted between the impact wheel 420 and the rotating shaft 416 in manner so that one end of the energy storing spring 424 abuts to a shoulder of the rotating shaft 416 and the other end of the energy storing spring 424 abuts to a side surface of the impact wheel 420. Under an axial biasing force of the energy storing spring 424 acting upon the impact wheel 420 along the axial direction of the rotating shaft 416, the impact wheel 420 is located at a first axial position relative to the rotating shaft 416. In the first axial position, the impact wheel 420 rotates in a circle on the rotating shaft 416 and the steel balls. When the impact wheel 420 is rotated to a position where the projections 422 contact the second end 412 of the striking rod 400, and the striking rod 400 encounters a larger resistance that is difficult to overcome provisionally, the impact wheel 420 is temporarily stopped from rotating by the striking rod 400, so that the impact wheel 420, with the cooperation of the steel wheels, guiding slots and inclined slots, overcomes the axial force of the spring 424, compresses the energy storing spring 424 and moves from the first axial position to a second axial position relative to the rotating shaft 416. At the second axial position, the projection 422 of the impact wheel 420 departs from the striking rod 400, and the stopping is released. In this case, the energy storing spring 424 starts to release its elastic potential energy. Under a function of rebound axial force of the energy storing spring 424, the impact wheel 420 is pressed back to its first axial position quickly, and is moved at a higher speed than that of the rotating shaft 416 with the cooperation of the inclined slots, guiding slots and steel wheels. As a result, the second end 412 of the striking rod 400 is impacted by the projections 422 of the impact wheel 420 to move at a high speed in a direction away from the projections 422, and the striking rod 400 strikes the end face 20b of the tool bit 20 quickly. In this way, a strike action is achieved. When the impact wheel 420 is continuously driven to rotate and to be stopped by the striking rod 400, the wheel enters into succeeding cycles, which will be achieved in the same manner.
Additional features of the motor and transmission mechanism are disclosed in U.S. Pat. No. 8,439,243, which is hereby incorporated by reference in its entirety.
Referring now to
As shown in
The front portion 32 of the shroud 30 includes notched surfaces 40 for retaining a front portion of the lower support surface.
As illustrated, for example, in
Blind holes 50 can be provided in upright sections 46. The blind holes 50 allow for securing, the stationary plate to the upright sections 46. Additionally, the notch sections 48 have threaded apertures 52 for inserting components of the clamp plate spring assembly. Inner surfaces 36 of the shroud 30 can have ribbed surfaces 54 integrally formed with the upright sections 46. The ribbed surfaces 54 support the stationary plate within the shroud 30. The left side of the shroud 30 in
The valley portion 44 of the shroud 30 has a V-shape as a main or central component of the cross-section. The V-shape of the shroud provides a controlled surface for the location of the various cylindrical anchor setting, bits.
As shown in
The shroud can be formed from steel, sheet metal, or materials such as plastic, magnesium and aluminum.
In an embodiment of the present invention, shown, for example, in
In addition to the V-shape portion of the cross-section, the stationary plate 60 also includes a plurality of tabs 62 through which a threaded fastener 64 can secure the stationary plate, through the blind holes 50, to the upright sections 46 of the shroud 30. The tabs 62 can be formed to project radially inward from an inner surface of the stationary plate 60 and to fold over the upright sections 46 of the shroud 30. The tabs 62 can be arranged in laterally opposing pairs, that is, on opposite sides of the valley 44 in the shroud 30. The stationary plate 60 can be formed from any material including but not limited to, hardened steel.
In an embodiment of the present invention, shown, for example in
Another structural characteristic of the clamp plate 70 is that the front end of the clamp plate can be non-parallel. As shown for example in
The clamp plate 70 also includes a plurality of tabs 74 that are aligned with the notch sections 48 of the shroud 30. The clamp plate tabs 74 extend laterally from the center portion of the clamp plate. The clamp plate 70 can have an aperture in each tab 74 that is axially aligned with the threaded apertures 52. The tabs 74 are arranged in a longitudinal direction of the shroud 30. At rest, the tabs 74 of the clamp plate are flush with horizontal surface portions of the upper support member 46. Stationary posts or clamp plate sleeves 72 are inserted into the apertures in the clamp plate 70 and the shroud to locate the clamp plate relative to the shroud. The clamp plate can be constrained in the tool by one or more clamp plate sleeves that are aligned to the shroud 30 by means of fasteners.
Additionally, the clamp plate sleeves 72 constrain movement of the clamp plate 70 to move only vertically with respect to the shroud. The tabs 74 alternate with the tabs 62 of the stationary plate 60 along the lateral wall 42 of the shroud 30.
The clamp plate 70 can also have a lead-in surface of alternate cross-section that guides the tool bit into the power tool.
In an embodiment, clamp washers 76 can be secured to the clamp plate 70 around the clamp plate apertures. The clamp washers 76 may be placed between the clamp plate springs and the clamp plate. The clamp washer 76 serves to distribute the load and create a rest surface for the springs, such as, for example, when the springs are compressed by entry of the tool bit into the bit retention device.
The clamp plate 70 can be formed from any material including but not limited to hardened steel and sheet metal.
In an embodiment, shown in
In an embodiment of the present invention, as shown in
The clamp plate sleeves 72 prevents the clamp plate 70 from shifting sideways with respect to the shroud 30 when the clamp plate moves vertically along the clamp plate sleeve and when the clamp plate and stationary plate 60 are holding a tool bit 20.
In an embodiment shown in
The clamp plate springs 80 can be mounted between the clamp plate 70 and the lower support member. In an embodiment of the present invention, the clamp plate spring 80, such as, for example, helical compression springs, are disposed around the clamp plate sleeves 72 to provide a clamping force against the clamp plate 70 to hold the tool bit 20. The clamp plate springs 80 provide resistance against movement of the clamp plate 70 toward the lower support member by biasing the clamp plate in the direction of the stationary plate 60.
The clamp plate springs 80 may be of various types including, but not limited to coil springs, torsion springs, and leaf springs. Although helical coil springs are illustrated, the clamp plate element may alternatively be retained by a mechanical or electrically operated clamp.
When a tool bit 20 is inserted along the longitudinal axis of the shroud 30 between the stationary plate 60 and the clamp plate 70, the diameter of the tool bit radially displaces the clamp plate 70 away from the stationary plate 60. In addition, the resistance provided by the clamp plate springs 80 ensures an interference fit of the tool bit 20 between the stationary plate 60 and the clamp plate 70.
In an embodiment of the present invention as shown in
The cage 82 has apertures therethrough for inserting fastening elements to secure the cage to the shroud 30.
As shown in the cross-sectional view of
Replaceable inserts or anchor setting bits having various diameters and lengths are retained during use of the tool. Changing between different sized tool bits is made easier and faster than in existing bit retention devices. Although a cylindrical tool bit is illustrated, the bits can be of any shape including but not limited to rectangular, triangular and oval. The spring-loaded clamp plate and clamp plate spring assembly automatically adjusts and applies a retaining force to accommodate different sizes of bits. As a result, no tools are needed to load or unload the tool bits.
While aspects of the present invention are described herein and illustrated in the accompanying drawings in the context of a fastening, tool, those of ordinary skill in the art will appreciate that the invention, in its broadest aspects, has further applicability.
It will be appreciated that the above description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. While specific examples have been described in the specification and illustrated in the drawings, it will be understood by those of ordinary skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure as defined in the claims. Furthermore, the mixing and matching of features, elements and/or functions between various examples is expressly contemplated herein, even if not specifically shown or described, so that one of ordinary skill in the art would appreciate from this disclosure that features, elements and/or functions of one example may be incorporated into another example as appropriate, unless described otherwise, above. Moreover, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular examples illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out the teachings of the present disclosure, but that the scope of the present disclosure will include any embodiments falling within the foregoing description and the appended claims.
| Number | Date | Country | |
|---|---|---|---|
| 61944843 | Feb 2014 | US |
