US1170125A - Bench dog or clamp. - Google Patents

Description

W. J. VILLARD.

BENCH DOG 0R CLAMP.

APPLICATION FILED MAR. 30. 1915.

1,170,125. Patented Feb. 1, 1916.

K I .iiHllllll Witnesses ventor;

Attorneys.

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' WALTER J. VILLARD, or BLOOMINGTON, ILLINOIS.

BENCHTDOG o R'oLAMr.

me ias;

To all whom it may concern:

Be it known that I, WALTER J. V LnARD, a citizen of the United States, residing at Bloomington, in the county of McLean and object, and means whereby said meansmay then be forced with considerablepressure against the board or object for securely or firmly clamping the same in place while being operated upon.

It is also within the scope of the present invention to provide a bench dog having the features above noted, the dog being of unique construction and operation to the said end, and in order that the device will be comparatively simple, compact and inexpensive in construction, as well. as being convenient, serviceable, practicaland eflicient in use.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the.

invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a plan view of the improved device, portions being broken away. Figs. 2 and 3 are enlarged sectional views taken on the lines 22 and 33, respectively, of Fig. 1.

In carrying out the invention, the body of the device comprises a base 1 in the form of a plate or casting, and having a longitudinal upper channel '2, and a laterally projecting extension 3 adjacent one end. The extension 3 is provided with a circular depression or recess 4, the channel 2 being arranged tangentially relative to the recess 4 and there being an opening 4 between the channel and Patented Feb. 1, 1916.

Application filed March 30, 1915. Serial No. 18,158.

recess. A top plate or cover 5 is secured upon the base 1 by means of screws or other securing means 6, for closing the channel 2 and recess 4, and holding the parts therein. The base 1 is also provided with an upstanding lug 7 approximately centrally of the recess 4, and with an arcuate slot 8 at one side of the recess 4. The base 1 is also provided with depending tenons 9, of which there may be any number, which are adapted to lit into mortises or bores drilled in the top of the bench or other support to which the dog is to be applied, and whereby the base 1 iskheld in place upon the bench, table, or the A bar 10 is slidable snugly within the channel 2 and projects beyond the ends of the base, one end of the bar 10 having a toothed jaw or head 11 to engage the board or other object which is to be clamped.

That edge of the bar 10 adjacent the recess 4' is provided with rack teeth 12, while the opposite edge of the bar 10 is provided with ratchet teeth 13.

7 As a means for forcibly sliding or moving the bar 10, an eccentric 14 is journaled upon the lug 7 within the recess 4, and is provided at that point of its periphery farthest from the lug or pivot 7, with teeth 14 providing a gear segment arranged'to engage the teeth 12 when the eccentric 14 is swung properly, and to disengage the teeth 12 when the eccentric is swung in the opposite direction to the proper extent. The eccentric l4'is provided with a radially projecting shank or extension 15 projecting through and working within the slot 8, and the outer or free end portion 16 of the shank 15 is offset upwardly and is tapered for receiving thereon a removable slip handle 17. WVhen the handle 17 is swung to bring the shank 15 to that end of the slot 8 remote from the channel 2, the teeth 14 will be disengaged from the teeth 12, and the bar 10 will then be free to be slid within the channel 2, and when the handle 17 is swung toward the bar 10, the teeth 14 will be engaged to the teeth 12 so as to forcibly move the bar 10 to the left, as seen in Fig. 1.

Means are employed for holding the bar 10 against reverse or retrograde movement unless desired, and to this end the base 1 is provided at that side of the channel 2 opposite the recess 4, with a pair of bores 18 having inner counterbores or pockets 19, and pawls 20 are mounted for reciprocation in the counterbo res 19, and have stems 21 slidable within and projecting from the bores 18. The stems 21 are provided at their outer or free ends with knobs 22, and coiled wire expansion springs 23 are disposed between the pawls and shoulders formed by the counterbores 19, to yieldably press the pawls 2O inwardly against the ratchet teeth 13 of the bar 10. The pawls 20 are so arranged as to alternately snap over the ratchet teeth 13, whereby when one pawl 20 contacts with the shoulder of one tooth, the other pawl will be midway between the shoulders of two teeth, and this provides a nicety of adjustment, without the necessity of the ratchet teeth 13 being too small or fine.

In use, supposing the base 1 to be applied to the bench or table to hold its position thereon, when the handle 17 is swung away from the bar 10 to the dotted line position illustrated in Fig. 1, the eccentric teeth 14% V will be disengaged from the rack teeth 12 of the bar 10, and the bar 10 may then be readily slid to the left, as seen in the said figure, to bring the jaw or head 11 against the board or other object which is to be clamped upon the bench or table. This provides for a quick adjustment to bring the jaw or head 11 quickly against the board or object, and then by swinging the handle 17 toward the bar 10 to the full line position as seen in Fig. 1, the teeth 141 will be engaged to the teeth 12 of the bar 10, and when the handle 17 is forcibly swung by the hand, the bar 10 will be forced onward with considerable pressure, whereby the board or other object will be firmly clamped in position. The pawls 2O prevent the retrograde or return movement of the bar, unless the stems 21 are drawn outward to release the adjacent pawls from the ratchet teeth 13, when it is desired to slide the bar 10 back to release the board or object. When ing noted that when the cover or top plate 5 is removed, the eccentric 14 and bar 10 may be readily placed within the recess 4 and channel 2, respectively, and when the cover 5 is attached tothe base, the eccentric and bar will be held in operative position thereby. I

Having thus described the invention, what is claimed as new is In a device of the character described, a base having a channel, a recess at one side of the channel, an opening between the recess and channel, an upstanding lug within said recess, aslot at one side of the recess and a pocket at that side of the channel opposite the recess, a bar slidable in said channel, that edge of the bar adjacent the recess having rack teeth, the opposite edge of the bar having ratchet teeth, a spring pressed pawl disposed in said pocket and 00- operating with the ratchet teeth to prevent the retrograde movement of the bar, an eccentric journaled upon the said lug within the recess and having teeth at that portion farthest away from said lug to swing into and out of engagement with said rack teeth, the eccentric having a shank projecting through said slot, and a cover secured upon the base over said channel and recess to hold the bar and eccentric therein.

In testimony that I claim the foregoing as my own, I have hereto aifixed my signature in the presence of two witnesses.

WALTER J. VILLARD.

Witnesses:

JEssE E. HOFFMAN, WILSON MAJOR.

Copies of this patent may be obtained for five'cents each, by addressing the Commissioner of Patents, Washington, D. G.

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