Guide for a fastener hand tool

A guide for a fastener hand tool is disclosed including a truck having slidable engagement with a track affixed to the fastener hand tool. The slidable engagement comprises mated interlocking geometries between the truck and the track. A clamping mechanism is disposed on the truck for temporarily clamping opposing sides of the truck to the track at a desired position along the track and a contact piece having a non-marring, wear resistant surface is affixed to the truck. The contact piece is disposed for referencing against a guiding edge for a workpiece relative to the fastener delivery point. The truck can comprise a symmetrical shape such that the truck can be alternately engaged to the track with the clamping mechanism on a left side of the fastener hand tool or with the clamping mechanism on a right side of the fastener hand tool.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to fastener hand tools. Particularly, this invention relates to instruments for guiding the operation of hand tools for placement of a fastener media, including, but not limited to, pins, nails, staples or a rivets, caulking, tape, and adhesive.

2. Description of the Related Art

In various applications, different types of hand tools are used to dispense a fastening media such as nails, staples, rivets, caulking, tape, adhesive or numerous other types of fasteners. An individual user holds the tool, directs the operating end to a desired location, and activates the tool to deliver the fastening medium to the desired location. In one example, a nail gun (which can be powered by compressed air, electric power, combustion, or any other known power system) is configured to be held in one hand. The user directs the driver tip to a desired location, e.g. the surface of a wood workpiece at a location having a second wood workpiece directly behind it. The user then depresses a trigger causing the nail gun to rapidly drive a nail at the desired in a single power stroke penetrating both wood workpieces such that the nail fastens the two wood workpieces together. Other driven fasteners, such as staples and rivets can be delivered by similar hand tools.

In contrast, applied fastener media, such as caulking, tape or adhesive can be dispensed from hand tools such that when the user depresses an operating trigger, the fastening media is delivered continuously until the trigger is released. In this case, the fastening media is applied to a first workpiece surface and a second workpiece is positioned onto the first workpiece after application with the fastening media therebetween to form a bond.

In general, however, all such fastener hand tools are designed to dispense their respective fastener medium under the free hand direction of the user. Thus, such tools typically provide no means to conveniently and precisely control the placement of the fastener medium in a reapeatable manner, e.g. yielding a straight line of fasteners. This deficiency can often result in a variety of problems, particularly from less skilled users.

For example, haphazard placement of the fastener media can present a unprofessional appearance. Driven fastener media can be disposed in a flawed manner exiting the finished product in unacceptable locations yielding a visually unacceptable result. Such improper placement of the fastener media can also result inadequate fastening strength between workpieces due to misalignment of the fastener media. Some of these problems can be so severe that the finished product is unacceptable and must be completely redone. In addition, dispensing the fastener media without a guide can be significantly slower and therefore substantially more expensive. In addition, mistakes are the enevitable consequence of ordinary human error. Such mistakes can cost significant time and money to revisit and correct, reducing profits. Some tools for guiding the operation of the fastener hand tools have been developed.

U.S. Pat. No. 5,261,588 by Lin, issued Nov. 16, 1993, discloses an auxiliary slidable abutment is pivotally mounted on the nail cartridge of a nailing gun in such manners that it slides in a direction consistent with axis of the nail cartridge, and that it can be locked at any given point of its sliding course, and further that its bottom extends downward beyond the nail cartridge. It provides the nailing gun with the capability of doing things, such as driving with precision the nails onto a workpiece at the prescribed intervals, driving the nails with precision onto the fastened area of a horizontal board and a vertical board, and driving the nails onto a workpiece at a prescribed angle and with precision.

U.S. Patent Application Publication No. 2009/0152323 by Lin, published Jun. 18, 2009, discloses a position scale for a nail gun includes a scale member, a positioning member, and an extending member. The scale member is mounted on the nail gun with a zero scale aligned with a muzzle of the nail gun. The positioning member is detachably mounted on the scale member for reciprocation along the scale member with a position portion as an index of the scale marks of the scale member. The extending member is detachably mounted on the positioning member with an extending position portion vertical to the scale member, wherein the extending member is distal to the nail gun than the positioning member.

In view of the foregoing, there is a need in the art for apparatuses and methods for guiding the operation of fastener hand tools. There is a need for such apparatuses and methods to aid in controlling the delivery of the fastening with precision and repeatability. There is also a need for such devices to improve the speed and efficiency in dispensing the fastening medium and to do so while reducing the likelihood of errors. These and other needs are met by the present invention as detailed hereafter.

SUMMARY OF THE INVENTION

A guide for a fastener hand tool is disclosed including a truck having slidable engagement with a track affixed to the fastener hand tool. The slidable engagement comprises mated interlocking geometries between the truck and the track. A clamping mechanism is disposed on the truck for temporarily clamping opposing sides of the truck to the track at a desired position along the track and a contact piece having a non-marring, wear resistant surface is affixed to the truck. The contact piece is disposed for referencing against a guiding edge for a workpiece relative to the fastener delivery point. The truck can comprise a symmetrical shape such that the truck can be alternately engaged to the track with the clamping mechanism on a left side of the fastener hand tool or with the clamping mechanism on a right side of the fastener hand tool.

A typical embodiment of the invention comprises a guide for a fastener hand tool including a truck having slidable engagement with a track affixed to the fastener hand tool and having one end disposed proximate to a fastener delivery point of the hand tool, the slidable engagement comprising mated interlocking geometries between the truck and the track, a clamping mechanism disposed on the truck for temporarily clamping opposing sides of the truck to the track at a desired position along the track, and a contact piece having a non-marring, wear resistant surface affixed to the truck, the contact piece disposed for referencing a guiding edge for a workpiece relative to the fastener delivery point. The track can include a marked scale showing position of the truck relative to the fastener delivery point.

The mated interlocking geometries between the truck and the track can be symmetric such that the truck can be alternately engaged to the track with the clamping mechanism operated from a left side of the fastener hand tool or with the clamping mechanism operated from a right side of the fastener hand tool.

In a typical embodiment of the invention, the clamping mechanism can comprise a threaded joint spanning opposing sides of the truck. The threaded joint can include a captured nut disposed within a box section on one of the opposing sides of the truck. In addition, the threaded joint can comprise a thumb screw or a cam lock on the other side of the truck.

In some embodiments of the invention, the contact piece can comprise a disc having a hole therethrough and a pin through the hole affixes the contact piece in a channel within the truck. The channel of the truck can include ribs for securing the pin and engagement of the clamping mechanism clamping opposing sides of the truck to the track can simultaneously clamp the pin within the channel of the truck. The pin can engage the truck to be aligned parallel with the track and with the surface of the contact piece perpendicular to the track. The channel can also be open to both a front end and a rear end of the truck and the contact piece can be alternately engaged in either the front end or the rear end of the channel. The non-marring, wear resistant surface can comprise a nylon, a ultra-high-molecular-weight (UHMW) polyethylene, or a polytetrafluoroethylene (PTFE) material.

In further embodiments of the invention, the track can comprise a separate component affixable to the hand tool such that the one end of the track is disposed proximate to the fastener delivery point of the hand tool. The separate component can include a channel for engaging a bottom edge of the hand tool, the channel having opposing inner edges and tongue along one of the opposing inner edges, the tongue having a taper high spot in the middle and reduced heights at both ends. Alternately, the track can be integral to the fastener hand tool. In either case, the track can extend beyond a back end of the fastener hand tool.

Embodiments of the invention can include fastener hand tools dispensing a driven fastener medium selected from the group consisting of nails, pins, rivets and staples or fastener hand tools dispensing an applied fastener medium selected from the group consisting of caulk, tape, or adhesive.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As previously mentioned, embodiments of the invention encompass a guide for a fastener hand tool. The guide includes a truck having slidable engagement with a track affixed to the fastener hand tool. The slidable engagement comprises mated interlocking geometries between the truck and the track. The guide can be implemented with a separate attachable track to the fastener hand tool or with an integral track built into the tool. A clamping mechanism is disposed on the truck for temporarily clamping opposing sides of the truck to the track at a desired position along the track and a contact piece having a non-marring, wear resistant surface is affixed to the truck. The contact piece is disposed for referencing against a guiding edge for a workpiece relative to the fastener delivery point.

The guide can facilitate both left-right and front-back functional symmetry. The truck can employ a configuration such that it can be alternately engaged to the track with the clamping mechanism on a left side of the fastener hand tool or with the clamping mechanism on a right side of the fastener hand tool. Thus, the truck is left-right functionally symmetric. Similarly, the contact piece can be engaged to either the front end or back end of the truck and employed. In this manner, the guide is also front-back functionally symmetric.

It should be noted that, although example embodiments of the invention are described herein with respect to an example nail gun, those skilled in the art will understand that the novel guide for a fastener hand tool is readily applicable to any suitable type of fastener hand tool for dispensing a range of fastener media. The differences in the detailed designs of the various types of fastener hand tools can be readily accommodated implementing an embodiment of the invention as described herein without undue experimentation. Accordingly, a fastener hand tool as referenced herein refers to any hand tool, power, pneumatic, manual, hydraulic, etc. that dispenses any kind of fastener media, including, but not limited to, a nail gun, a screw gun, a staple gun, a caulking gun, a rivet gun, a tape dispenser or any other suitable fastener media hand tool as will be understood by those skilled in the art. Typically, an applicable fastener hand tool can dispense a fastener medium in either a driven or applied form.

Driven media such as nails, pins, rivets or staples can be delivered individually from a fastener hand tool with a quick forced impact from the delivery point of the tool with each pull of the trigger. Such driven fastener hand tools can be powered by compressed air, combustion gases, electric linear motor or any other suitable drive source.

Applied fastener medium such as caulk or adhesive can be dispensed from a fastener hand tool continuously from the delivery point of the tool as long as pressure is applied to the trigger. Such applied fastener hand tools can be powered by the user's hand pressure (although a powered heating element may be used to liquify some types of adhesive). A fastening media such as tape can be drawn out of an unpowered hand tool, pulled from an end that is initially fastened to the workpiece.

2. Exemplary Guide for a Fastener Hand Tool

FIGS. 1A to 1Cshow front, side, and back views, respectively of an exemplary embodiment of the invention for guiding operation of a fastener hand tool114. The guide100comprises a simple, compact system including a truck102and a contact piece104. Typically, the contact piece104is affixed to the truck102with a pin122(e.g. bolt, nail, or any suitable post with a head) that is engaged through a hole in the contact piece104into the truck102. The truck102is slidably engaged with a track106(or rail) that is affixed to the fastener hand tool with one end of the track106disposed nearer to a fastener delivery point112of the hand tool114than the opposite end. The guide100also includes a clamping mechanism110disposed on the truck102for temporarily clamping opposing sides of the truck102to the track106at a desired position along the track106by the user.

FIGS. 1D and 1Eshow side views of the exemplary embodiment of the invention for guiding operation of a fastener hand tool114in use positioning a fastener medium relative to a reference edge116in different positions along the track106.FIG. 1Dshows the guide100with the truck102clamped on the track106in a position very near the fastener delivery point112as appropriate for the relative distance between the guiding edge116and the fastener delivery point112. In contrast,FIG. 1Eshows the guide100with the truck102clamped on the track106in a position very distant from the fastener delivery point112due to the more distant guiding edge116.FIG. 1Dalso shows the track106including a marked scale showing position of the truck relative to the fastener delivery point, which can optionally be included with any embodiment described herein. The marked scale can be integrated into the track by laser etching, machining, stamping, printing, bonding with adhesive or any other suitable process.

In both cases, the user directs the fastener delivery point112of the fastener hand tool114to a desired location based on the guide contact with the reference edge116. With the truck102properly positioned on the track106, the fastener delivery point112on the surface of a workpiece118A is automatically located such that the second workpiece118B is directly behind it. Thus, the user can operate the fastener hand tool114with confidence even though he may not be able to see the location of the second workpiece118B.

Activation of the fastener hand tool114by the user causes the fastener medium120, e.g. a nail, to be delivered penetrating both workpieces118A,118B such that the fastener medium120secures the two workpieces118A,118B together. Location of the next fastener is quickly identifed by the user by simply moving the fastener hand tool114along the reference edge116(in a direction perpendicular to the track106).

It should be noted that in the case of applied fastener media, such as caulking, tape or adhesive, the guide100is used in the same manner except that the fastener medium120is applied directly to the surface of the workpiece118A. The second workpiece is then positioned onto the first workpiece118A surface after application with the fastener media therebetween to form a bond. Although there is no blind fastening with applied fastener media such as caulking, tape or adhesive, the user still benefits significantly by being able to deliver a straight line of fastener media as applied fastener media is delivered continuously until the trigger is released. Thus, applied fastener media types benefit from the control maintained by the guide100as the fastener hand tool114is moved along the reference edge116(in a direction perpendicular to the track106) continuously delivering the fastener media.

FIGS. 2A and 2Bshow close up side and back views of an exemplary embodiment of the invention for guiding operation of a fastener hand tool114. The slidable engagement between the truck102and track106is accomplished through mating interlocking geometries108on each. In one example, the mating interlocking geometries108comprise two opposing tongues on the truck102which engage matching outward facing slots on the track106. Typically, the gap between the interlocking profiles may only be a few thousandths of a inch allowing the interlocking geometries to freely slide between each other. Once the geometries are interlocked, the truck102can only be moved linearly back and forth along the track106and can only be disengaged from the track106by being moved beyond one end of the track106. The interlocking geometries of the truck102are part of a contiguous element.

The truck102can be produced from any suitably strong structural material, such as a metals like steel or aluminum. Lighter metals are preferred to minimize weight added to the hand tool. In addition, although it is possible to produce the truck102as a machined part, the slidable engagement between the truck102and track106through mating interlocking geometries108makes these elements ideally suited for manufacturing production through an extrusion process, such as with extruded aluminum, as will be understood by those skilled in the art.

The slidable engagement between the truck102and track106can employ any suitable interlocking geometries108can be used as will be understood by those skilled in the art. For example, the opposing tongues can alternately be disposed on the track106with the slots on the truck102and/or the tongues and slots can comprise more complex geometric key and matching keyway designs. A symmetrical design for the interlocking geometries108such as this is necessary for enabling the left-right functional symmetry as further described hereafter with respect toFIGS. 4A and 4B.

Another example of suitable (but asymmetrical) interlocking geometries is shown by the attachment of the track106to the fastener hand tool114. SeeFIGS. 1C and 2B. In this case, a channel has a single tongue (or lip) on one side and a flat backing surface on the opposing side. The single tongue engages a slot on one side of the fastener hand tool114with the flat backing surface braced on the other side. SeeFIGS. 1C and 3C. These interlocking geometries108can also provide a slidable engagement if they are incorporated between the truck102and the track106(or the truck102and directly to the fastener hand tool114as described hereafter with reference toFIGS. 5A to 5C).

The contact piece104affixed to the truck102employs a non-marring, wear resistant surface. The contact piece104is designed so that it can be used against finish workpiece surfaces without causing damage or requiring cleaning. Accordingly, the contact piece104can be made from nylon, ultra high molecular weight (UHMW) polyethylene, polytetrafluoroethylene (PTFE) or any other suitable known material. The contact piece104can be affixed to the truck102with a pin122(e.g. bolt, nail, or any suitable post with a head) that is engaged through a hole in the contact piece104into the truck102.

Engagement to the truck102is made by inserting the pin122into a channel124in the truck102. The channel124extends through the length of the truck102and is open to both a front end and a rear end of the truck102. In addition, the channel124includes a pair of ribs on opposing sides which secure the pin122in place. When engaged with the truck102, the pin122is aligned to be parallel with the track106and with the surface of the contact piece104perpendicular to the track106. Because the channel is open at both ends, the contact piece104can be alternately engaged in either the front end or the rear end of the channel124. This enables front-back functional symmetry as previously mentioned. SeeFIG. 6described hereafter.

As previously described, the guide100also includes a clamping mechanism110disposed on the truck102for temporarily clamping opposing sides of the truck102to the track106at a desired position along the track106by the user. The clamping mechanism110can be implemented as a threaded joint spanning opposing sides of the truck102. In one example, the threaded joint includes a captured nut126disposed within a box section128on one of the opposing sides of the truck102. A thumb screw130(or wing nut) engages the threaded joint through a hole132on the opposite side of the truck102. In another example, the clamping mechanism can be implemented as a cam lock134on the opposite side of the truck102. SeeFIG. 2C. The cam lock134comprises a member (e.g. threaded member) engaging a fixed center150that is in turn rotatably engaged to a lever152having a variable radius (depending upon lever position) against a fixed surface. Those skilled in the art will appreciate that any other suitable known clamping mechanism can be implemented for clamping opposing sides of the truck102to the track106as well.

It should be noted due to the design of the truck102having an overall channel configuration with two opposing sides that each engage the track106, when the clamping mechanism110is engaged it simultaneously clamps the truck102to the track106and also pinches the pin122to become locked in the channel124. Thus, the clamping mechanism110serves a dual function.

3. Attachable Track with Tapered Engagement

FIGS. 3A to 3Cshow an exemplary attachable track for use with the exemplary embodiment of the invention for guiding operation of a fastener hand tool114. As previously mentioned, the track106includes an interlocking geometry108to engage the truck102. On the opposite side the track106also includes a channel136with a single tongue138(or lip) on one side and a flat backing surface140on the opposing side. The single tongue138engages a slot142on one side of the fastener hand tool114with the flat backing surface140braced against the other side.

In addition, the track106can employ a novel attachment feature to the fastener hand tool114. The tongue138is tapered along the length of the track106such that it has a high spot in the middle144and reduced heights at both ends146A,146B. A full height tongue across the length of the track106would be very difficult to install as the tongue forms an interference fit across the entire distance. Accordingly, the tapered tongue138reduces the length of the interference fit resulting in a good balance between secure engagement of the track106to the tool114and making the track106removeable by hand. Adjustment of the interference fit can be readily achieved with minor crimping of the channel136, particularly in the area of the high spot in the middle144.

FIGS. 4A and 4Bshow front views of an exemplary embodiment of the invention for guiding operation of a fastener hand tool114with left and right functional symmetry. As previously mentioned, a symmetrical design for the interlocking geometries108is required for enabling the left-right functional symmetry. This allows the truck102to be installed onto the track106in either direction as shown. As previously described, the clamping mechanism110is operated from one side of the truck102. Accordingly, if the truck102can be installed and operated in either direction, the clamping mechanism110can be used from either the left or right side of the fastener hand tool114as desired by the user as shown.

It is important to note that this left-right functional symmetry also requires that the contact piece104can be installed symmetrically front to back as well as previously described. This is necessary because, if the truck102is reversed, the contact piece104will be reversed as well. If the user desires to use the guide in the same mode, e.g. with the contact piece surface facing the fastener delivery point112, the contact piece104must be positioned on the opposite side of the truck102as well. As previously described, the engagement channel124for the pin122of the contact piece104being open to both ends of the truck102enables this reversible installation of the contact piece104.

5. Integral Fastener Hand Tool Track

FIGS. 5A and 5Bshow front views of embodiments of the invention employing a separate track piece and an integral track, respectively, for guiding operation of a fastener hand tool. As previously mentioned, embodiments of the invention can be implemented with a separate track106, e.g. as described inFIGS. 3A to 3C, or with an integral track106built into the fastener hand tool114.FIG. 5Ashows the separate track106configuration, whereasFIG. 5Bshows an example embodiment employing an integral track106. In this case, the interlocking geometry108is configured to engage directly a track106integrated into the fastener hand tool114as shown. It is important to note that, although the integral track106is shown with an asymmetric interlocking geometry108, the integral track106can be readily configured with a symmetric interlocking geometry108such as previously described, e.g. inFIG. 2B.FIG. 5Cshows a side view of an integral track106for guiding operation of a fastener hand tool114.

FIG. 6shows a side view showing operation of an embodiment of the invention employing a reversed contact piece104. This illustrates an alternate operating mode for the guide100employing the contact piece104installed on the opposite side of the truck102such that the surface of the contact piece104is facing away from the fastener delivery point112. This allows the user to employ the guide100if the reference edge116is disposed facing towards the fastener delivery point112as shown.

It should be noted that the height of the truck102may interfere with the workpieces118A,118B in some installations. Embodiments of the invention are not limited to a truck102having the relative height as shown in the figures. Those skilled in the art will a truck102having a shorter height in order to reduce the chances of interference in use is well within the scope of the described embodiments.

7. Extended Track

FIG. 7shows a side view showing operation of an embodiment of the invention employing an extended track106beyond the back end of the fastener hand tool114. Just as the height of the truck102can be varied as described above, the length of the track106can also be varied within the scope of the invention. Embodiments of the invention can employ a track106of any length provided the resulting length enables a structurally stable use. An extended track106as shown inFIG. 7(or longer) can be employed temporarily in an unusual fastener installation scenario. The user can opt for a shorter length track106in regular use.

This concludes the description including the preferred embodiments of the present invention. The foregoing description including the preferred embodiment of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible within the scope of the foregoing teachings. Additional variations of the present invention may be devised without departing from the inventive concept as set forth in the following claims.