Automatic nailing machines are well known. Typically, in such a machine, nails joined side-by-side are stored in a magazine or nail basket. The nails are then fed into alignment with a pneumatic driver, which drives the nails when a trigger is pulled.
There are a number of applications where it is desirable to employ a washer with the nail, such as applying compressible materials, such as foam board insulation, or other tearable materials to a wall or roof. At the present time, there is no effective automatic device for automatically providing a washer to each nail as it is inserted. An object of the present invention is to provide such a device.
In accordance with the present invention, an automatic washer feeder for an automatic nail gun comprises a washer storage container that stores a coil of washers interconnected together edge-to-edge, a feeding mechanism that uncoils the washers and feeds them one at a time into a position wherein the washers are in alignment with nails being driven by the nail gun, the feeding mechanism being synchronized with the nail gun driver such that one washer is placed in line with each nail before it is driven. The washers are attached together edge-to-edge by a breakable linkage which is broken or cut when a washer is driven into contact with a substrate surface being nailed by the action of the nail gun. The present invention can be an attachment for an existing nail gun or it can be incorporated as an integral part of the tool.
A number of features of the present invention are shown in the attached drawings and described below in connection with preferred embodiments of the present invention.
a is a plan view of the apparatus of
a is a side elevational view of the apparatus of
b is a side view showing a plurality of washers connected together edge-to-edge by means of an adhesive tape attached to the tops of the washers.
a and 13b are perspective views of the track mechanism of the embodiment of
a through 14c are a perspective view, plan view, and rear elevational view of the foot mechanism of the embodiment of
a through 25d are a perspective view and left side, right side, and front elevational views of the washer pusher mechanism of
a and 26b are a schematic plan view and schematic side elevational view, respectively, of the washer feed mechanism, showing the washer locator, retainer, and washer pusher mechanisms.
a is a side elevational view of the slide track mechanism of the embodiment of
b and 29c are perspective views of the slide track mechanism taken from a position above and a position below the track mechanisms.
a and 33b are plan views of the foot mechanism of
Referring to the drawings, a conventional nail gun 10 shown schematically in
In accordance with the present invention, a washer magazine or basket 26 positioned adjacent the nail basket 18 houses a plurality of washers on a spool or reel 28. The washers are connected edge-to-edge, and fed in a line along washer slide track 29 to a foot mechanism 30 positioned below driver 16 and nail track 20. As disclosed in more detail below, the washers are fed into alignment with nail driver 16 along with nails from the nail basket, such that when the driver is reciprocated, it first engages a nail and then causes the nail to be inserted through the washer and then drives the nail into the substrate.
The manner in which the washers are fed along the washer slide track 29 is shown in
The characteristics of the tape used to attach the washers together is quite important. The tape must be strong enough to allow at least a two or three pound pull on the tape without breaking so that the washers can be fed. On the other hand, the tape must either break or be separable from the washers sufficiently easily that the washers will separate when they are driven into the substrate along with a nail. A preferred tape is polypropylene tape with a natural rubber adhesive. Another tape that has been found to be satisfactory is a polyester tape coated with a silicone pressure sensitive adhesive, sold by 3M as Scotch Brand No. 8902, and known as composite bonding tape. This tape has a relatively low level of elongation before it breaks, about 120 percent. The adhesive is strong enough to adhere to metal or plastic with sufficient strength within a temperature range of 150 degrees F. to below freezing and preferably to at least as low as 20 degrees F. The tape with the natural rubber adhesive has comparable characteristics.
As shown in
The manner in which the washers are advanced one by one into alignment with the nail gun driver is shown schematically in
A washer locator 45 is positioned adjacent the sides of the washers in order to resiliently hold them in a predetermined location until they are fed into position to be driven with a nail. The washer locator 45 illustrated is a spring member mounted at one end at a fixed position by a screw 46 or the like to slide track 29. The other end of the spring includes an outwardly extending portion 48 that fits between adjacent washers and properly positions them. This spring is resiliently deflected out of the way in order to permit the washers to be pushed past the spring by means of the washer pusher.
The manner in which the washers are separated from the tape is shown schematically in
The fact that the tape is affixed to the tops of the washers is also important. When the tape is affixed to the tops of the washers and the washers are separated slightly, the washers can then be wound on a reel or spool with the tape on top of the washers. This provides a substantially more compact method of storing the washers than attachment of the tape to the undersides of the washers.
In order to permit the washers to be wound in a coil with the tape attached to the tops of the washers, it is necessary to space the edges of adjacent washers apart so that the desired arcuate contour can be obtained without the edges of the washers coming into engagement and interfering with the inward bending of the washer strip. The washers are desirably separated by about forty to sixty-two thousandths of an inch and preferably about fifty thousandths of an inch.
Desirably, the washers are wound on spools or reels formed of cardboard or other suitable material, which are then mounted into a basket or reel holder 26. In the present invention, the spool is sufficiently large to hold approximately 350 washers. This is desirable because a conventional nail basket holds about 350 nails, so the user can replenish the supply of nails and washers at approximately the same time.
A feature of the present invention is to attach the washers together with the pressure sensitive adhesive tape described above and to mount the tape as described. This provides an effective and inexpensive way of attaching the washers together. However, there are other ways to attach washers together that functionally can be satisfactory. These include molding or otherwise forming the washers with their edges joined together edge-to-edge; molding the washers side-by-side with a string, such as a nylon fishing line, extending though the mold cavity and being integrally molded into the washers (called “string collation”); melting the washers together so that they are attached edge-to-edge; gluing or bonding the washers together edge-to-edge; and attaching the washers with mechanical tabs, such as a tab on one washer that fits a recess in another washer.
The present tape method may provide some cost advantage over other attachment methods, but other methods will work. An integrally molded washer strip 31′ is shown in
A washer strip 31″ wherein individual washers are attached together by a nylon or string or other plastic filament 37 is shown in
While molded washers are contemplated in
One embodiment of the invention is shown in more detail in assembled form in
A washer slide track 74 (
Foot mechanism 95 comprises a lower member 96 and an upper bar 98 which together encircle an open center area 101 through which nails are driven. The foot has spaced vertical openings 100 extending downwardly from the upper side of the foot. A pair of pins 97 and 99 fit snugly in the openings and slide up and down in mating openings in the tubular members 88 and 90 on the track, which serves as a bearing guide. Bar 98 engages a movable safety bracket 104 (see
As shown in
A washer retainer 110, shown in
The washer feed mechanism of this embodiment also includes a washer locator in the form of an indexing spring 113 that is attached to the side plate 112 of retainer 110 by screws 115 or the like that extend through slotted openings in the side plate and into the side of the slide track (see
The details of the washer pusher 120 employed in the embodiment of
As shown in
An alternative embodiment 144 of the present invention is shown in
While the present invention is particularly suitable for automatically inserting plastic washers on nails as they are driven into a substrate, it is contemplated that the present invention also can be used to insert nails in metal washers. In such a case, either a light weight, pierceable metal washer is used or it is necessary to provide an accurate aligning mechanism so that the nail accurately hits the hole in the metal washer. Another way of inserting a nail in a metal washer is to provide a means to first set the tip of the nail in the washer without applying the full driving force of the driver to the nail. Once the nail is set, the driver can be applied with full force to drive the nail into the substrate.
Another, and preferred embodiment of the present invention is shown in
Referring to
The reel holder 152 is securely attached to the nail gun by means of a bracket 172 which has openings in an upper surface that are bolted downwardly on the top of the nail gun. The reel holder can also have a reinforcing arm attaching the side of the reel holder to the handle of the gun. However, this reinforcing arm is generally not necessary in this embodiment.
As stated above, washers are mounted on a spool 205 formed of cardboard or other suitable material, having circular plates on each side of a cylindrical core connecting the plates. The spool fits loosely into the reel holder and washers are fed downwardly from curved flange 170 at the inlet of the washer passage to outlet 166 of the washer passageway. By eliminating a spindle on which the reel is mounted, this reduces rotational friction between the reel and the reel holder, thus facilitating the feeding of washers to the nail gun. While the reel rests loosely in the cavity in the reel holder, tabs 176 positioned adjacent the outer edge of the reel holder restrain the reel from falling out of the open side of the reel holder. The flexible sides of the reel can be pinched together to insert the reel into the cavity and to remove the reel from the cavity, but the tabs are generally sufficient to hold the reel in the cavity during use.
In the present invention, it is desirable that the coil of washers be able to rotate freely on the reel and not require that the reel itself rotate. Thus, if the reel becomes wet or otherwise sticks in the reel holder the washers will still be free to rotate on the reel and be dispensed with minimum of pulling force. This construction is accomplished by mounting the washers on the reel by a process called back spinning. First, to wind the strip of washers on the reel a piece of adhesive tape at one end of the strip 203 of washers is attached to the core 205 of the reel and then the reel is rotated until the washers are wound on the reel (
The slide mechanism 168 of the embodiment of
This embodiment of the invention also includes a washer locator or indexing spring 186 of somewhat different shape than the indexing spring of the prior embodiment. In this embodiment, indexing spring 186 includes a resilient flat portion 187 and a circular end portion 188 that extends inwardly into an opening 190 in the mounting bracket 192 of the washer feeder mechanism. The circular end portion of the spring fits between adjacent washers and holds them in a proper position until they are to be pushed into alignment with the nail driver. The indexing spring is deflected out of the way when the washer pusher advances the washers in the mechanism, while the retaining spring holds the washers down on the track.
In the embodiment disclosed in
The embodiment of
The present invention provides a simple and economical way to automatically feed washers so that they are inserted on each nail as the nail is driven into a substrate by an automatic nail gun in a reliable and efficient manner.
This is a divisional application of U.S. patent application Ser. No. 10/121,627, filed Apr. 12, 2002, now abandoned which is a continuation of U.S. patent application Ser. No. 09/380,871, filed Sep. 10, 1999, now abandoned, which is a National Stage of PCT Application PCT/US99/02791, filed Feb. 9, 1999, which claims the benefit of U.S. Provisional Application 60/074,050, filed Feb. 9, 1998, now abandoned.
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Number | Date | Country | |
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Child | 11425399 | US |
Number | Date | Country | |
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Parent | 09380371 | US | |
Child | 10121627 | US |