US744792A - Brake. - Google Patents

Description

, PATBN'TBD Nov.'24, 1903.

J. l E. P10K.

BRAKE.

APPLIOATI-ON FILED BBB; 7, 1903.

NO lMODEL.

` l l l l l I I Lr 'hun ,UNITED STATES atented November 24, 1903.

PATENT OFFICE.

JOHN HENRY PICK, OF STAMFORD, ENGLAND, ASSIGNOR TO THE RICK MOTOR. COMPANY, LIMITED, OF STAMFORD, LINCOLN, ENGLAND.

BRAKE.`

SPECIFICATION forming part of Letters Patent No. 744,792, dated November 24, 1903.

Application led February 7, 1903. Serial No. 142,264. (No model.)

To a/ZZrwr/om it may concern:

Stamford, Lincoln, England, have invented new and useful Improvements in Brakes, of which the following is a specification.

This invention relates to an improved brake especially applicable for use in connection with motor-vehicles, but also applicable for other purposes.

According to my invention I fix a drum upon a moving axle'or shaft, and in connection with this drum I use a metal band, preferably lined with leather or other material and having at its two ends boxes through which a shaft, carried in a fixed standard or support, extends. This shaft has formed upon or attached to it a cam, which works in the boxes of the brake-band and which is so arranged that the partial rotation of the said cam causes the boxesto move in opposite' directions, and thereby grip the band on the drum. The spring of the band is sufcient to remove the brake from frictional contact' with the drum. A

The brake is preferably operated by a lever mounted upon the cam-shaft.

InY the accompanying drawings, Figure l is a side elevation of a brake made according to the invention. Fig. 2 is an end elevation thereof, and Fig. 3 is a sectional elevation of the band-boxes and cam.

o, is the moving axle or shaft which is to be braked, and b is the drunrwhich is keyed thereto, the said drum being provided with a peripheral groove b.

c is the metal band, which, as above, described, is advantageously provided with the leather or other suitable lining d and which is coiled around the peripheral groove b' in the'drum b.

e and f arethe two boxes to which the two ends of the band c are secured, the said boxes being formed with guiding-apertures e and f', respectively,throughwhich passes theconcentric portion of the shaft g rotatably mounted in the standard or support h, which is here shown carried bya sleeve i on the shaft a.

j is the cam, which is keyed upon the shaft g inside the two boxes e andl f. This cam is shown of an elliptical shape, the ends of the boxes against which the said cam bears being of a corresponding shape, as will be seen from Fig. 3. When the cam is in the normal positionthat is to say, in the position shownin ythe drawings with its major axis upright-the band c is slack upon the drum b. If, however, the shaft g be turned in either direction through the medium of the lever k, keyed upon it, the two boxes are moved by the cam in opposite directions or toward one another, thereby tightening the band c upon the drum b. Upon releasing the lever 7c the spring or elasticity of the band c`is sufficient to take it out of frictional contact with the drum.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is tobe performed, I declare that what I claim is- In a brake, the combination with a drum and a metal band surrounding the same, of a box attached to each end of said band, the said boxes having each a guiding-aperture, a shaft having a concentric portion passing through said guiding-apertures and a cam on said shaft adapted to bear against the ends of the boxes to move them in opposite directions and tighten the band upon the drum', whereby the said band grips the drum throughout its entire circumference with substantially equal pressure, substantially as described. Y

JOHN HENRY PICK. Witnesses:

JOHN E. BoUsFIELD, C. G. REDEERN.

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