US8903A - Holdback for sleds - Google Patents

Description

. P. DICKSON.

Sled-Brake.

Patented Apr. 27, 1852.

AM PHOTO-LITHO. [20- N.Y. (OSBCRNES PROCESS) PERRY DICKSON, OF BLOOMING VALLEY, PENNSYLVANIA.

HOLDBACK FOR SLEDS.

Specification of Letters Patent No. 8,903, dated April 27, 1852.

To all whom it may concern:

Be it knownthat I, PERRY Dickson, of Blooming Valley, in the county of Crawford and State of Pennsylvania, have invented a new and useful Improvement in the Holdbacks of Sleds; and I do hereby declare that the following is a full, clear, and exact description of. the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1, is a plan of a sled to which the improvement is applied. Fig. 2, is a longitudinal elevation of the same. Fig. 3, is alongitudinal section of the same.

Similar letters of reference indicate corresponding parts in each of the several fig- A, is the sled. g B, is the roller which is square, and turns upon pivots b, b, whlch are placed as far as possible downward and backward from its center.

C, C, are the dogs, which are secured by clamp bolts a, to the upper side of the roller opposite the hounds of the tongue; they are of suificient length to allow of their ends, which are hooked,to enter the snow or ice, when the roller is turned back far enough to bring them to an angle of to the sur face. The front end of each dog has a. hinge eye formed upon it which stands above and in front of the roller.

D, is the tongue, to the bounds (Z, (Z, of which are secured plates E, E, on the undersides of whichare eyes which fit to, and form hinge joints 6, with the eyes on the front ends of the dogs. The back parts f, f, of the plates E, extend over the front parts of the dogs, which are upon the roller, and form stops, against which the dogs and roller rest, and are kept rigid with the tongue while drawing.

The operation is as followsin drawing, the dogs are held up to the position shown in Fig. 2, as the draft acting on the hinges 6, turns the'roller over forward; but in descending an inclined surface,where the sled has a tendency to run faster than is consistent with safety, the slightest cessation of draft on the part of the animal, will cause the roller to turn over backward and drive the dogs into the ground as represented in Fig. 3. In stopping the sled on a level surface the same effect will be produced by the stopping of the animal; but on the slightest draft being applied to the tongue the dogs are raised and the sled is left free to run onward. In backing, when necessary, the form and position of the teeth of the dogs, allow them to slide freely over the ground.

I do not claim connecting the dogs with, and operating them by the backward pressure of the tongue, but

I claim as my invention and desire to se-- cure by Letters Patent, as being moresimple than the ordinary means by which this is effected,

Attaching the dogs 0, C, to the roller B, rigidly, instead of to therunners as is usual, and connecting the tongue to the said roller by hinges or analogous joints, in such a manner that the backward motion of the tongue in relation to the body of the sled, turns the roller on its axis and forces the points of the dogs so attached to it into the snow or ice of theroad, substantially as and for the purpose herein set forth.

PERRY DICKSON.

Witnesses DAVID NELSON, Coornn RAY,

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