US2780810A - Template for use with a stud driver - Google Patents

Description

Feb, 12, 1957 R. T. CATLIN ETAL TEMPLATE FOR USE WITH A STUD DRIVER 2 Sheets-Sheet 1 Filed May 25, 1953 Illlll.

2,780,810 r Patented Feb-12, 1957 miz TELATE FOR USE WITH A STUDD =1 a ER Robert T. fiatlin, Stratford, and'Cnrtis C. Clair, Milford, Conn, assignors to Remington Arms Company, line, Bridgeport, Conn, a corporationof'Delaware Application'May 25, 19 5s, seriarNo. 356,976 2 Claims. (Cl. 1"44.'5)

In certain applications-it is desirable to beable to further control the use of such stud drivers and to 'positively prevent their use except at specified predetermined safe locations. Such an arrangement is particularly desirable where stud drivers are used in repetitive assembly work. Typical examples of situations where such restricted firing control might be useful in repetitive assembly work are fastening bench tops to steel nnderframes, setting studs for anchoring bench feet to concrete floors, setting studs for installing conveyor sys tems, and mounting components of electrical systems.

It is the object of this invention to provide means for restricting the firing of studs to predetermined locations. For the greatest utility and the greatest safety, a supplement object is to provide such means which are also applicable as locating jigs on templates for accurately locating the studs which are to be driven.

A stud driver of the type shown in the application of Merle H. Walker, Serial Number 225,146, filed May 8, 1951, now Patent No. 2,645,772, issued July 21, 1953, lends itself particularly well to such an application, for in that tool the conventional guard is mounted on an action tube extension which telescopes over the barrel and normally extends forward beyond the muzzle end thereof. This action tube extension is coupled to an action tube which is arranged to release the fire control and permit firing of the stud driver only when the tool has been pressed against the work with sufiicient force to cause the action tube and action tube extension to be retracted re.ative to the barrel sufficiently to bring the end of the action tube extension back nearly to the plane of the muzzle or front end of the barrel. An action tube cover is provided on that tool which insures that, with the guard and action tube extension removed, it is not possible to release the fire control and fire the stud driver.

We contemplate that the best method of realizing the objects of our invention is to substitute for the action tube extension of the stud driver shown in the Walker patent application, above referred to, an action tube extension which does not extend to the muzzle of the barrel. We contemplate operating that short action tube extension by means of a guide tube which may be placed in the position where a stud is to be driven. Thus, the tool can only be fired when placed in the guide tube.

Preferably, the length of the short action tube extension is such that it will vanish within the action tube cover before it has been retracted enough to release the 2 fire control,-althou'gh the extension should be long enough to protrude from the action tube cover when no pressure is applied to the end thereof to permit theapplication of a Wrench to the extension for a change back to a standard guard.

The exact nature of the invention as well as other objects and advantages thereof will become apparent from consideration of the following specification referring to the attached drawings in which: 7

Fig. 1 is a vertical sectional view of suitable guide tubes and fitting plates secured to a template.

Fig. 2 is a side elevational view partially-in section showing the tool of the Walker application-previously referred to, with a short action tube extensionin place.

Fig. 3 is a view similar to Fig. 2, showing the tool inserted in the guide tube before pressure is applied thereto.

Fig. 4 is a view similar to Fig. 3, after sutficient pressure has been applied to the tool to release the sear-lock.

Referring to the drawings by characters of reference, it will be seen that Fig. 1 shows a template or base plate I. to which a fitting plate 2 and an attached or integral guide tube 3 are secured. The base plate 1 may be'any member which has a fixed location relative to the position in which the stud is to be driven.

In Fig. 2 we have shown a stud driving'tool comprising a barrel 4, 'an action tube 5, action tube cover 6; and frame plate 7. To' this assembly there may be 'a'ttaclie'd by the hinge pin 8 a breech block 9 and housing 10 within which a fire control mechanism including a firing pin H, sear l2, and sear lock plunger 13 may be mounted. With the breech block in position to close the breech of the barrel aligned holes 14 and 15 in frame plate and breech block respectively permit the passage of an action tube finger 16. This action tube finger is supported on the action tube and when the action tube is retracted toward the frame plate, may pass through the aligned holes and engage the sear lock plunger 13 to release the fire control by moving the plunger 13 to the position shown in Fig. 4 where it is out of the way of the sear 12 and no longer prevents the sear 12 from being disengaged from the firing pin 11. The mechanism thus far described in relation to Fig. 2 is not a part of our invention, but is, instead, that which forms the tubject of the Walker application above referred to.

We have departed from the Walker construction by removing therefrom the action tube extension with its attached conical guard and have, instead, substituted a short action tube extension 17. The short action tube extension need only be long enough to extend out of the action tube cover 6 far enough to permit access to wrench flats 18 formed thereon for application or removal of the extension. The extension should nOt be long enough to permit grasping the extension and thereby moving the action tube far enough toward the frame plate to release the sear lock plunger without causing the outer end of the extension to disappear within the'action tube cover.

When the stud driver barrel is placed in the guide tube as shown in Figs. 3 and 4, the combined length of the action tube extension, and guide tube plus the thickness of the template 1, should be not less than the length of the original action tube extension-guard assembly. Described in another way, these dimensions should be such that when the stud driver is pressed toward the template with sufiicient force to bring the muzzle of the barrel to near the bottom face of the template, the action tube finger should be in position to retract the sear lock plunger and thereby release the fire control. Preferably, the combined length of action tube extension and guide tube should be less than the length of the original action tube extension-guard assembly by about the thickness of the template. With these dimensions, it will not be practicable to apply a loose guide tube and fitting plate to the barrel as a workable substitute for a standard guard. This is so because an attempt to press the tool toward the work and release the fire control will bring the muzzle of the barrel into contact with the work before the sear lock plunger has been retracted.

As shown in Fig. 1, the template may be laid out and a fitting plate-guide tube assembly secured in each location where a stud is to be driven. The stud driver with the short action tube extension in place may then be applied in succession to each guide tube and a stud driven at the location so determined. The stud driver may not, however, be fired indiscriminately, for the guide tube is a necessary element for the release of the fire control.

As a slight modification of our basic invention, the fitting plates may be formed to the shape and size of the interior of standard electrical outlet boxes and the guide tubes located to drive studs in the desired locations in the box. In such a case, the guide tube should be long enough to release the sear lock plunger at or shortly before the muzzle of the barrel has been brought to the plane of the end of the guide tube. For such an application, an electrical contractor, for example, could be supplied with a set of guide tube assemblies with fitting plates matching all of the standard electrical outlet boxes. This modification would be primarily useful as a means of accurately locating the driven stud with relation to the outlet box, since it would lack some of the safety features obtained by use of fixed position guide tubes.

Although we have illustrated only one embodiment of our invention, it should be obvious that modifications may be made therein without departing from the spirit of our invention. For an exact definition of the limits which we place upon our invention, reference may be had to the claims appended hereto.

We claim:

1. A template for use with a stud driving tool having a barrel for receiving a cartridge and a stud to be driven and having also a safety device operator longitudinally displaceable on said barrel to permit firing of the tool, said template comprising in combination a plate provided with apertures through which studs are to be driven into a workpiece upon which said template is placed, and a guide tube mounted in coaxial alignment with each of said apertures and rigidly secured to said plate, each of said guide tubes being of such diameter as to telescopically receive and guide the barrel of said tool and of such height that the upper end thereof longitudinally displaces Said safety device operator on the barrel of the tool when the barrel of the tool is inserted into stud driving position in a guide tube.

2. The combination described in claim 1, in which fastening means are provided for securing said tubes in a fixed position where studs are to be repetitively driven.

References Cited in the file of this patent UNITED STATES PATENTS 2,189,439 Temple Feb. 6, 1940 2,455,825 Temple Dec. 7, 1948 2,594,275 Baisch Apr. 29, 1952 2,637,241 Weber May 5, 1953 2,648,840 Farnsworth Aug. 18, 1953

Images