US169027A

US169027A - Improvement in joiners clamps

Info

Publication number: US169027A
Authority: US
Publication date: 1875-10-19
Anticipated expiration: 1892-10-19

Description

UNITED STATE-s PATENT OFFICE GUSTAV A. NAUMANN, OF S'I. LOUIS, MISSOURI.

IMPROVEMENT IN JOINERS CLAMPS.-

Specication forming part of Letters Patent No. l 69,027. dated October 19, 1875; application led September 6, 1875.

To all whom it may concern:`

Be it known that I, GUsTAv ADOLPH NAU- MANN, ot' St. Louis, Missouri, have invented an Improved J oiners Olamp, of which the following is a specitication:

The ordinary clamp-screw consists of jaws or holders operated by wooden hand-screws reversely positioned, so that, to adjust and use thejaws or clamps Lfor holding work, it is necessary to turn both screws in opposite directions. This to do, in large clamp-screws, more especially, is very ditlicult; also, said screws project in opposite directions, rendering the device inconvenient, cumbersome, and and difficult for operating, turning, or handling; nor can the device holding` the work be laid down or positioned in accordance with the position best suited to the nature of the Work. All this to avoid isthe object of my improvement; and it consists in the novel construction and combination of its parts in manner now to be more fully described.

Of the drawing, Figure l is a sectional elevation. Fig. 2 is a plansection ot' the Inovable jaw on line x x.

A is the Xed jaw, constructed as ordinary. B is the movable jaw. B1B2 are the handscrews. The hand-screws I have both positioned alike, both running through the upper jaw B, and both secured in the txed jaw A, as shown in Fig. l. To dispense with the constant screwing together and apart ot' the jaws, I make the movable jaw B capable ot' being brought toward or away from the jaw A by sliding on the screws. This I accomplish as follows: The jaw B I make hollow almost its entire length. (See Figs. l and 2.) In its hollow is a slide, O, which is made otf the constructive shape shown in Fig. 2, having slots cc', for the double purpose of allowing the screws B1 B2 to pass through, as well as to lighten the weight of the slide. The back sides of the slots cc have threads cut in them, (see Fig. 1,) to engage the threads of the handlscrews, and are held in engagement with the latter by a spring, D, inserted behind the slide. (See figures.) lSimilarly I provide the opposite sides of the slots d d ot' the jaw B with screw-threads, indicated in Fig. l.

to narrow, or vice versa, the end of the slide' projecting out at the back of' the jaw B is pressed in by the operator, which compresses the spring, and disengages the threaded sides oi the slide from the hand-screws, and said screws from the threads in the upperjaw, and thus said jaw is capa-ble of being adjusted as the nature of the work requires. the operators hold on the slide is released, the spring restores said slide in original engagement with the hand-screws.

lhe screws B1 B2 I prefer making of metal, having the threads thereof running reversely, (see Fig. 1,) so that the engagement described with the threads in thejaw B, as well as slide O, can be had. Also, the slide is of metal. The device is, therefore, durable, cheap, and

its advantages over ordinary clamps ot' this character apparent.

What I claim is- The combination of' the movablejaw B, carrying the slide O, having slots c c', the spring D, the hand-screws 151132, having bearing-surface of threads reversed, all said parts being constructed and arranged to operate With relation to each other and a fixed jaw, A, substantially as is herein shown and described, and for the purpose set forth.

In testimony of said invention I have hereunto set my hand.

GUSTAV ADOLPH NAUMANN.

Witnesses WiLLrAM: W. HERTHEL, CEAS. F. MErsNER.

As soon asv