US178022A - Improvement in joiners clamps - Google Patents

Description

PATENT (Darren.

GUSTAV A. ,NAUMANN, 0F sr. LOUIS, MISSOURI.

IMPROVEMENT IN JOINERS CLAMPS.

Specification forming part of Letters Patent N 0. 178,022, dated May 30, 1876; application filed April 11, 1876.

To all whom it may concern:

Be it known that I, GUSTAV A. NAUMANN, of St. Louis, Missouri, have invented an Improvement in Joiners Clamps, of which the following is a specification:

This invention is an improvement on patents issued to me dated and numbered, re-

spectively, October 19, 1875, N 0. 169,027, and

March 14, 1876, No. 174,838.

Of the drawing, Figure 1 is a sectional elevation, showing the parts locked. Fig. 2 is a bottom plan of top plate with its operating parts in open or unlocked condition. Fig. 3 is a detail view of manner of fastening the front screw, Fig. 4 being a side elevation of the key used to operate the slides.

A and B are the fixed and movable jaws, respectively. 0 and O are the front and rear hand -screws, respectively. D and D are front and rear slides, which are to clamp the hand-screws. These slides are similar in construction, each having a nut-shaped portion with screw threads corresponding to the threads of the handscrews, and as shown in Fig. 1. The action and movement of the slides D D is similar as in my last patent referred to; but the parts that operate said slides constituting my present improvement are as follows: Besides the threaded portion of the slides D D, I construct the remaining part thereof to each present the hook shaped shanks cl and d (SeeFig. 2.) The space hetween the hook ends d and d is adapted to admitof a turn-key, d cross-shaped or doublearmed in construction, and as shown in Figs. 1, 2, and 4. d d (see Fig. 4.) are the arms of the-key, acting or turning in the space left between the two hooks of the slides, and consequently forcing said slides apart in opposite directions. E is a spring, (see Figs. 1 and 2,) which serves to return the slides to original position.

To retain my operating parts a cover-plate, F, is screwed down upon the top of the jaw and over the operating parts, said cover having proper opening for the hand-screws, and

the screws as firmly as possible, and at same time not weaken unnecessarily the jaw: The front screw, when any article is clamped, tends to draw outor unloosen its hold in the lower jaw, while the strain of the other handscrew is downward. In my present joint I pass the forward screw, say, about two-thirds into the jaw, and hold it in position by a staple, f which engages around the neck of the screw end, said staple having a broad bearing-surface, to act against the solid material above. (See Fig. 3.) The rear screw need only then to have ajoint with the lower jaw sufficient to prevent said screw disengaging or slipping out of its place, and giving it as much solid bearing below as possible. For this purpose I merely pass a pin, f through the jaw, to engage the neck end of the screw. (See Fig. 1.)

Thus constructed and arranged, the operation of the parts is as follows: The parts being iii locked position, (see Fig. 1,) the key (1 is on a cross-line with relation to the position of the book ends or slidesproper. To disengage the movable jaw from adjustment, the key is therefore turned, say, a quarter-turn, to the right; its arms d d engaging the hook end of the slides, force saine in opposite directions away from the hand-screws, and assume the unlocked position shown in Fig. 2. In this position the key has its arms parallel with the slides, and is at a dead-point; and having compressedthe spring E, the movable jaw is sufficiently loosened to be adjusted to required positions along the hand-screws. To secure the movable jaw in adjusted position, the key is turned so as to come to the position shown in Fig. 1, which enables the compressed spring to relock the slides in engagement with the hand-screws, and as indicated in Fig. 1.

Theadvantages achieved by this construction and operation of the parts (over my former patents) are, that the operation is more reliable, the clamp decisively and solidly holdin g the article. The adjustment of the movable jaw is greatly facilitated, and is positive by its slides in disengaging and engaging the threads; besides, the construction here shown and described is far more simple, easier made, and cheaper. In use, the clamp-screw is much more durable, stronger, and effective in its parts, for it will be noted that the greater solid 0, and stationary jaw A, arranged to operate portion of the jaw is retained-an advantage in the manner and for the purpose set forth.

of great importance in machines of this nature. In testimony of said invention I have here-- What I claim isunto set my hand. The turn-keyd having arms d d, the slides GUSTAV A. NAUMANN.

D D, having hook-shanks 01 d the spring E, Witnesses:

plateor cover F, having slot f, in combination WILLIAM W. HERTHEL,

with movable jaw B, right-and-lcft screws 0 OHAs. F. MEISNER.

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