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Patents used by William Hood

D 13 690

Patent Number D 13 690
Date Applied For 7 December 1882
Date Issued 6 March 1883
Issued to Amedee J Benjamin
Location Valley Falls, R I
Current Class/ subclass D8/ 72

Drawing in Patent D 13, 690 to Benjamin, used by Hood

Illustration of Patent

The illustration has just 1 figure, with the jaws, and screws indicated, and the pronounced curve to the outer faces or backs of the jaws.

Description of Design Patent

Quoting the specification:

Heretofore hand screws or clamps -- such as are used by carpenters, cabinet-makers, and others for holding their work together -- have been made with straight backs parallel with the faces of the jaws.

My design consists in making the backs of the jaws of curved form, the outline of which, when viewed in elevation, as in the drawing, forms a graceful convex configuration extending from the rear end of the jaw to the bevel of the nose end thereof, said convexity having its greatest projection at or about the central portion of the jaw, at or near where the center screw of the device passes through.

A A are the jaws, which may be said to constitute the frame of the device; B, the center screw, and C the end screw. The inner faces, b, of the jaws are of straight configuration, as usual, and their noses or front ends, d, of the ordinary beveled form; but the backs of the jaws are made with a graceful convex sweep or configuration, e, extending from the rear ends, f, to the forward part, g, at which point the convexity terminates and the ordinary end level d joins the convexity. The greatest projection or convexity of the curved back e is intended to be at or about the central portion of the Jaws A, where the ordinary center screw, B, intersects it. This curved or convex configuration of the backs of the jaws presents to the eye a much more desireable and graceful form for the jaws than the common form of jaws heretofore used in hand-screws, the backs of which are made straight and parallel with the faces of the jaws.

And the claim:

  1. The within-described design for the form or configuration of hand screws or clamps, which consists in the backs of the jaws made of convex form, as herein shown and described.
  2. The design for a hand screw or clamp herein shown and described, the same consisting in having the backs of the jaws made with a convex form or configuration, the greatest projection of the convexity being about where the center screw of the devices passes through the jaws, as set forth.

Note that the patent expired in 1897. Note that later models of Hood (and Hood and Rice) clamps keep the curvature indicated at f and g, but otherwise the back of the jaws is flat.

last revised and validated

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