Specification of Robert Clark : truss.

  • Clark, Robert.
Date:
1856
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Robert Clark : truss. Source: Wellcome Collection.

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    Clark's Improved Truss. 10 be void, as in and by tbe said Letters Patent, relation being thereunto had, may more fully and at large appear. NOW KNOW YE, that in compliance with the said proviso, I, the said Robert Clark, do hereby declare that the said Invention, and the manner in which the same is to be performed, is described and ascertained by the 5 Drawing or Plan, and description thereof, with the references thereto herein- after contained. In witness wliereof, I have hereunto set my hand and seal, this Twenty- second day of April, in the year of our Lord One thousand eight hundred and three. The Invention and improvements for which the Patent is claimed are three, videlicet:— First, the circular motion, of which the plate B is capable on it’s centre, and which allows the pad, with it’s adjustments, to be placed immediately to it’s 15 required bearing. Second, the sliding motion allowed to the pad, by which means the pad remains firmly held to the required part, independent of the irregular motions of the body. Third, the application of the lever to the instrument, and which, with a screw adjustment, produces a pressure on the pad, which can be increased 20 or diminis he at pleasure. Description of the Truss, it’s several Parts, their Arrangement and Uses. The body spring A, with the buckle and roller at one end of it, and a strap at the other to attach the instrument to the body with, is as in common with other trusses. B, Fig. 1, is a geometrical representation of a circular plate, which 25 is fixed on the body spring of the truss with a screw and collet (d9 Fig. 2). On this plate are fixed two bars, edgewise, and parrallel to each other (a, a, Fig. 1), to either end of which the rest of the apparatus may occasionally be fixed. (6,&,) are circular slits or apertures made near the circumference of the plate, and which allows it the motion described in the first part of the claim ; the screws 30 (c, c,) with their collets being fixed to the body spring. B, Fig. 2, is a profile of the same Plate, shewing the manner in which it is fixed to the body spring, and the profile or side view of the bars (a. a). C, Fig. 1, represents a frame, having the half of a double joint at one of it’s extremities (e), and that of a single joint at the other (/). The end (e) of this frame may occasionally be 35 applied to either end of the bars (a, a,) of the plate B. C, Fig. 2, is a profile view of the same plate. D, Fig. 1, represents an apparatus, with rollers, to prevent friction, which is attached to and slides on the frame C on one side,