US112342A - Improvement in door-clamps - Google Patents

Description

'UNITED STATES PATENT OEETcE,

HENRYO. HOOPER, OF DIAMOND SPRINGS, CALIFOBIA.

IMPROVEMENT IN DOOR-CLAM PS.

y Specification forming part of Letters Patent No. 112,342, dated March 7, 1871.

To all whom it may concern.-

Be it known that I, HENRY O. HOOPER, of Diamond Springs, county of El Dorado, State of California, have invented certain new and useful Improvements in Door-Clamps 5 and I do hereby declare the `following description and accompanying drawings are suicient to enable any person skilled in the art or science to which it most nearly appertains to make and use my said invention or improvements Without further invention-or experiment.

My present invention has for its object an improvement in door-clamps g and it relates more especially to a doorfclamp for which Letters Patent were granted to me, No. 92,531,

`and dated July 13, 1869.

It consists in so forming the movable side pieces of the clamp which holds the door, andv their operating screws and gears, that these side pieces shall be moved equally at the top and bottom, and not necessitate an extension of those pieces down throughthe door, as is practically the case in the former machine.

Referring to the accompanying drawing for a more complete explanation of my invention, Figure 1 is an 4end view, and Fig. 2 is a side elevation.

A is the bed or licor which the cross-beams Brest. The upright posts C are fitted so as to slide at the bottom on the guiding-beams B, or they may travel On rollers, if desired. At the top of the posts C are placed, longitudinally, the bars D, which serve to support the door.

The projections or lugs E, which rise above the edge of the door as it lies, serve to clamp it when the sides D are moved toward each other.

The sides of the clamp are Operated by two screw-bars, F, at each end, one pair extending through the upper part and the other pair through the lower part of the posts C. u Nuts are firmly secured in the posts for each" l of the screws to pass through, and thethreads of each screw are made either right or left hand, according to their position, so that when they are turned the sides may be brought simultaneously toward each other, Or separated, as desired.

At or near -the center of each of the four screw-bars Fis placed a worms/heel, G, the two wheels at either end coming near enough 4together to be both operated by the same Worm or screw H. By this arrangement only two worms are needed to Operate thc top and bottom of both clamps, and these are placed at the ends of a shaft, I. This shaft is suitably supported by the central posts, J, within which the worms turn and through which the screw-bars pass, as shown.

The shaftI is turned by a belt which passes around the pulley K, and its motion can be reversed, to separate the sides by a cross-belt, upon the same pulley. By this arrangement I am enabled to insure a perfectly parallel movement of the clamps, so that, whether widely separated or near together, the clamps will always stand vertically, and will thus hold the door more securely.

I am also enabled to dispense with the eX- tensi'on of the posts C, which were formerlyaecessary in a practical machine.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The upper and lower sets of worm-wheels G, upon their respective screw-rods F, to gether with the shaft I and the worms H, when constructed to operate upon the posts C of the clamp, substantially as and for the purpose described.

In witness that the above-described invention is claimed by me I have hereunto set my hand and seal.

HENRY O. HOOPEB. [L. s] Witnesses:

JOHN L. BOONE, GEO. H. STRONG.'

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