US653637A - Machine-brake. - Google Patents

Description

No. 653,637. Patented luly I0, |900.

D'. AS'HMAN.

MACHINE BRAKE.

(Application led Jn. 25, 1900.)

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'NITED STATES PATENT Ormes;

DAVID ASHMAN, OF BALTIMORE, MARYLAND,

MANUFACTURING CO.

ASSIGNOR TO EAGLE NIACHINEBRAKE.

srncIFrcArioN forming part of Letters Patent No. 653,637, dated July 1o, 1900.

Application led January 25, 1900. Serial No. 2,736. (No model.)

To allai/hom t may concer-72,:

Be it known thatV I', DAVID AsHMAN, a citi- 'zen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Machine-Brakes, of which the following is a specification.

This invention relates to improvements in a brake device for machines, and is especially adapted for use on sewing-machines employing ily-wheels, although it is applicable to other classes of machines.

Thev invention is illustrated in the accompanying drawings, in which- Figure l is a vertical longitudinal section through the frame of a machine and illustrates the application of the invention. Fig. 2 illustrates one view of the operating-lever. Fig. 3 is an inverted plan view of the contact-brake device. Figli. is an elevation of part of the machine-frame and of the contact-brake device.

Referring to the drawings, the letters a c. designate two vertical standards of the frame of the machine which support the top b and are connected at the bottom by a stay-rod c, the ends of which pass through the standards and are secured thereto by means 0f nuts d.v The standard a is provided with a central hole e, through which one end of the driving-shaft f is passed, and a fly or driving wheel g is mounted on the projecting end of said shaft. A

guard his secured to the standard a by screws or bolts t', and said guard takes over the said wheel g. The guard h is provided with a hole opposite the end of the shaft, and a conepointed screw 7c is secured in said hole j, and the cone-point takes in a correspondinglyshaped indentation in the end of the shaft, thereby forming a cone-bearing. The opposite end of the shaft is also supported in a similar cone-bearing, the cone-pointed pin k' being secured in the standard d.

The standards a, and of. are each provided with a hole or bearing m m', anda rod n is supported in said bearings and is movable carries a brake-arm 19', which extends parallel with said rod and the end of which passes through an oblong hole q in the frame or standard a'. A spiral spring r surrounds the rod aand is compressed between the sleeve p and 5 5 the standard c', and said spring serves to press against the sleeve and push it and the rod endwise away from the standard a. lt will be seen that the oblong hole q in the frame, which receives the end of the brake-arm p', 6o is positioned so as to guide said arm in a horizontal plane to enable it to make contact with the rim of the fly or driving wheel g', and at the same time this construction prevents said arm and rod n from turning when the arm contacts with the revolving wheel. The end of the arm p has a dovetailed recess, and a block of rubber or other material s is inserted in said recess and contacts with the rim of the ily-wheel when it is desired to stop the latter 7o from revolving.

The standard a at a point between the driving-shaft f and endwise-movable rod n is provided with a bracket t, which supports an operating-lever u. The lever u at one end is provided with two prongs o, which take on opposite sides of the rod n between the two collars o o'. The said lever is provided with a pivot-hole w for a pivot-pin w', by means of which it is pivoted to the bracket t, and at the 8o lower end the lever. terminates in a fiat plate which may be actuated by the knee of the operator.

It will be seen that the collars 0 o and the sleeve p and arm p' are all adjustable on the 85 rod n.

The operation is as follows: Supposing the machine to be running and it being desired to stop the same, the operator will press against the plate @c of the lever u, pushing the 9o lower end of the lever toward the standard a, whereupon the upper or prong end of the lever will move in the opposite direction or toward the standard ct. This movement of the prong end of the lever will push the rod n toward the standard a' and cause the brakearm p to project through the oblong hole q and press the rubbers against the rim of the driving-wheel g. The rod n and brake-arm p', it has been stated, are prevented from roc turning with the wheel g because of the walls of the oblong hole q.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

In a brake device for machines, the combination of the standards a, a', formed with bearings m, m', and one of said standards ct being also formed with a hole q separate from its bearing; a shaft supported in said standards; a drive or fly wheel carried thereon; a rod movable endwise through bearings in a direction parallel with said shaft; a sleeve surrounding and secured to the movable rod and formed with a brake-arm p extending parallel with and spaced from said rod and projecting through the said separate hole q in 15 and the adjacent standard, and means for zo moving said rod and brake-arm.

In testimony whereof I aiiix my signature in the presence of two witnesses.

DAVID ASHMAN.

Vitnesses:

CHARLES B. MANN, J r., CHARLES L. VIETscH'.

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