US Patent: 280,390
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| Divider or Compass
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Patentee:
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| William H. Mitchell (exact or similar names) - Boston, MA |
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Patent Dates:
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| Applied: |
Nov. 20, 1882 |
| Granted: |
Jul. 03, 1883 |
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Patent Pictures:
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Joel Havens
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Description: |
| Abstract:
In the drawings, A and B are the legs, which, formed as represented, are jointed together at their upper ends, each by having fixed to and projecting from it one of two circular segments, a b, and being suitably recessed to receive the segment fixed to the other leg. Between the two segments and fastened to one of them, or in one piece with it, is a worm- gear, C, through which and the segment there is extended concentrically with them a pin or rivet, D, having a cylindrical head, e, from which there is projected in line with it (the said rivet) a screw, d. Screwed on the said screw d is a winged nut, e, which has with it a circular cavity, f, to receive the rivet- head, in order to enable the nut to bear against the next adjacent of the two segments. By hammering down the rivet at its outer end the necessary friction of the legs at the joint can be secured. In order to prevent the rivet from turning in the segment farthest from its head of the rivet, when on the head, may be prismatic, or, if cylindrical, may be secured by a pin driven partly into it and partly into the head.
Claim:
One leg provided at the joint of the two legs with a worm-gear extended from and fastened to it, (the said leg,) in combination with a segmental screw adapted to the other leg and to operate with the worm-gear. |
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