US2148800A

US2148800A - Differential screw for vises

Info

Publication number: US2148800A
Application number: US167199A
Authority: US
Inventors: Fred F Billings
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-10-04
Filing date: 1937-10-04
Publication date: 1939-02-28
Anticipated expiration: 1956-02-28

Description

Feb. 28, 1939. F. F. BILLINGS 2,148,800

DIFFERENTIAL SCREW FOR VISES Filed Oct. 4, 193';

P l? 1a 22 l0 W//////////////////////////////////////////////// a l L 1 Z INVEN TOR 45 not constitute a part of the invention. 6 will cause it (the sleeve) to stand still, while 45 Patented F eb. 28, 1939 l v UNITED STATES PATENT OFFICE DIFFERENTIAL SCREW FOR VISES Fred F. Billings, Belmont, N. H.

Application October 4, 1937, Serial No. 167,199 b i 2 Claims. (01. 8133) The invention relates to an operating screw for In the body of the movable jaw, in line with Vises, which shall be positive and rapid inits the nut K, a hole 5 is formed, constituting a action for opening and closing the vise when idle, bearing for the sleeve 6', threadedly mounted on and automatically provide means for exerting a the finer threaded end of the screw, next to the .5 powerful pressure the instant the vise jaws come collar 3. The hole is of less diameter than the 5 in contact withwork held between them. This is collar 3, but has its outer rim countersunk to corto be. accomplished without the necessity of marespond with a conical portion l9, formed on the nipulating any part of the vise other than the sleeve 6. handle, The sleeve 6 has a barrel portion of less diam- 10 l The invention also provides. for instantly locketer than that of the collar 3, which affords a 10 ing the differential feature out of action when the bearing for the jaw R, a conical portion l9, which vise is to be used on soft material, or on light provides a thrust-bearing on the outer side of the work where the fullpower of the screw is not rejaw, and a flanged portion l5, which terminates quired, or when it is desired to set the jaws more in a handwheel 15, outside the jaw R.

16 snugly against the work, before bringing the dif- A flanged Col spaced a short distance from ferential action into use the sleeve 6, is fixed t0 the smaller end Of the Another salient object is, to achieve the above screw i, by means of a pin 8, which pin also serves results without introducing a screw of objectionas a pivot for attaching the operating handle 9. ably fine pitch, in the construction of the mecha- A flange on the collar 1 approaches the rim of the 20 nism used, hand-wheel 16, forming with it a housing in 20 To accomplish these and other desirable results, which a spiral Sp is ca ed. the invention consists in the novel construction The spring I0 is an automatic differential conand arrangement of parts, as described in detail, trol for the screw I. It is attached t one d and set forth by the accompanying drawing, in to a boss [2, centrally located on the end of the which drawing, similar designating characters sleeve 6. Thence it spirals clockwise and out- 25 refer to the same parts throughout the series. Wardly throu Sev a t to a Point eal Figure 1 is a front elevation of the screw mechthe rim of the flang At this Point p e anism, and a vise of conventional type equipped 81108 l, 011 the inner Side Of the flange, engages therewith. Parts of the operating handle and a a p 29 in h end f h prin 0, t n in 30 flanged collar have been removed to reveal other to carry it forward in a clockwise direction. The 30 essential parts referred to in the description. torsion thus engendered tends to keep the sleeve Figure 2 is a vertical longitudinal section, taken 5 fi y ut a st t e collar 3, but admiton the line AB, Figure 1, of the invention as it ting of one or more revolutions of the screw appears in place in the body of a vise. within the sleeve 6, before the collar 1 will abut Figure 3 is a section of the latch l3. he sleeve 5.

0 generally represents a vise having a fixed W, With the Vise J' W Open! W e mot on is jaw n body, i hi h fixed t Serves imparted to the screw l by means of the handle as an anchorage for the operating screw of the 9, the Sleeve 3, under the tension of e Spring vise. A movable jaw R, is mounted in slidable w move as a unit With the Screw au 4o relation with the jaw D, by a hollow beam X, the l w R t0v pp t law D in a ratio de- 40 fixed in the base of the jaw R, and projecting termined by the thread in the nut K. If the mothrough a corresponding opening in the body tion be continued after the jaws make contact of the vise, These parts are shown only as a setwith work held between them, the friction enting for t mechanism t b d ib d do gendered on the conical portion l9 of the sleeve The screw I is provided with a coarse thread both threads on the screw I will pass on through at one end, of sufiicient length to extend through their respective huts; he spring in acting as a the nut K, and provide a range of action equal to yielding medium to admit of such action. The the intended capacity of the vise. The opposite differential action of the two threads thus re- 'end has a portion of its length turned to a slightly volving in unison, will cause the jaw R to ap- 50 smaller diameter, and provided with a thread 2, p ac t l D in a greatly reduced t of slightly finer pitch than that operating in the therebs affording a p werful leverage for tightnut K. At the juncture of the two diameters, a ening t l ws On the WOrk. collar 3, is mounted on the smaller end of the The screw action described in the preceding screw, and retained in place by the set-screw 4. paragraph is fully automatic, both for tightening 55 and loosening the vise, and under ideal conditions will give perfect results. Under practical conditions however, I prefer to employ means for looking the differential out of action when so desired, and this I accomplish in the following manner.

A deep notch 2| is formed in the rim of the hand-wheel l6, adjacent to the flanged collar 1, and extending a considerable distance around the rim of the wheel. In this notch, a latch I3 is pivotally mounted, being held in place by a screw 22, passing through an elongated hole 24, in the body of the latch, and into a boss l1, formed above the rim of the hand-wheel, midway of the ends of the notch 2l--2l. A hook 25 is formed at one end of the latch, and the latch is so poised in relation to the flanged collar 1, that the hook, when depressed as indicated by the dotted lines 18, will engage both the protuberance H on the flange l, and the end of the notch 2|, preventing any further relative motion between the collar 1, and the sleeve 6.

By pressing the opposite end 26 of the latch l3, the hook may be made to release its hold on the flange 1, restoring the differential function to the screw as already described.

In the body of the latch l3, adjacent to the screw 22, a compression spring I4 is placed at one end of the elongated hole 24. The tendency of this spring is to keep the corrugated end 23, of the latch, in close contact with the abrupt end of the notch 2|. The corrugations on the end of the latch are so formed as to act coordinately with the rounded end of the notch, causing the latch to remain in or out of action as the case may be.

The principle of the differential screw has been used in the past for many purposes, but, what I claim as new is:

1. In a vise, a combination of a screw having threads at one end, operating in a fixed nut in the body of the vise, a plain collar near the other end of the screw, threads of a finer pitch than the first threads, extending from the collar to the end of the screw, a sleeve threadedly mounted on the second threads, the sleeve forming a cylindrical bearing and a thrust bearing for the movable jaw of the vise, a flanged sleeve fixed to the end of the screw beyond the collar and separated from the latter, and a spring attached to the sleeve and the flanged sleeve, with tension adjusted to keep the sleeve abutted against the plain collar, substantially as described.

2; In a vise, a combination of a screw having a plain collar near its end, a thread extending from the collar to the end of the screw, a sleeve comprising a bearing for the movable jaw of the vise, mounted on the thread, a flange on the sleeve terminating in a hand-wheel outside the jaw, a flanged collar fixed to the end of the screw beyond the sleeve and separated therefrom, and a latch mounted in a notch in the rim of the handwheel, releasably engaging both the hand-wheel and the flanged collar, for the purpose described.

FRED F. BILLINGS.