US867401A - Beamless-brake mechanism. - Google Patents

Description

110,867,401. PATBNTED 0e11, 1907.

' =1. B. McKIEL.

BBAMLESS BRAKE MECHANISM.

mumm nun June, 1901.

ATTORNE ys UNITED STATES JAMES B. MCKIEL, OF MARSHALL, TEXAS.

BEAMLESS-BRAKE MECHANISM.

Specification of Letters Patent.

Patented Oct. 1, 1907.

Application filed July 9, 1907. Serial No- 382,869.

To all whom it may concern:

Be it known that 1, JAMES B. MCKIEL, a citizen of the United States, residing at Marshall, in the county of Harrison and State of Texas, have invented anew and useful BeamlessBrake Mechanism, of which the following is a specification.

The principal object of the present invention is to provide a beamless brake of such construction that the stress exerted during the braking operation will all be of a tensional character, and in which uniform action of all of the brakes, and uniform pressure oi all of the brake shoes may be effected.

A further object of the invention is to provide an arrangement of braking rods or levers in which the strain on all of the rods throughout the system from the initial point of application of power to the brake shoes will be tensional. i

With these and other objects in view, as will more fully hereinafter appear the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawingsz-Figure 1 is a plan view of a beamless brake system constructed and arranged in accordance with the invention. Fig. 2 is a transverse sectional view of a portion of one of the trucks showing the mounting of a pair of brake shoes. Fig. 3 is a detail perspective view oi'a pair of brake levers and a floating lever showing their connections.

Similar numerals of reference are employed to indi- Cate corresponding parts throughout the several figures of the drawings.

Projecting from the opposite sides of the transoms 32 are spaced lugs 40 provided with openings 42 which serve for the passage of pivot pins 44 that carry the brake lever 45. Each of the brake levers carries at its lower end a brake shoe head 46 to which may be attached a brake shoe 47 of any ordinary construction.

In arranging the braking system, provision is made for exercising a direct pull on all of the brake lever conl necting rods, so that there shall be no thrust strain. For this purpose the primary lever 50 is pivoted at 51 to a part of the car frame, and the secondary lever 52 is pivoted at 53 to the car frame. The piston rod 54 of j the brake cylinder exercises a direct outward thrust on the lever 50, and this pulls the connecting rod 52 which joins the primary and secondary levers in the direction indicated by the arrow in Fig. 1. This movement is transmitted to a cross bar 58 by a connecting rod 59 and from this cross bar the movement is transmitted through a pair oi rods (30 to levers 61, there being one of such levers adjacent each pair of wheels at the same side of the truck. Each lever 61 is connected by a pair of rods 62 to the brake shoe carrying levers 45. The same construction is followed at the opposite end of the car.

It will be noted that from the primary lever outward in both directions to the brake shoe levers the strain on every rod is a pulling strain and greater force may be transmitted by tensional strain than through thrust strain on any rods of equal weight. The rods may, therefore, be made much lighter than usual andtherc is no tendency to buckle as is the case where relatively light rods are subjected to endwise compression.

I claim:-

1. In a beamless brake, brake shoe levers, brake shoes carried thereby, a floating lever for each pair of brake shoe levers, tension rods connecting the floating lever to the brake shoe lever, primary and secondary brake levers, and tension rods connecting the primary and secondary levers to the floating levers.

2. In beamless brakes, a pair of brake shoe levers. brake shoes thereon, a floating lever arranged between and pivotally connected to both brake shoe levers. tension rods connecting the floating lever to the brake shoe levers, and

l a tension rod for operating the floating lever.

! 3. In beamless brakes, a pair of vertically swinging levers, pivot lugs-on which said levers are mounted, brake shoe heads pivoted to the lower ends of said levers, brake shoes carried by the head, a floating; lever arranged between the two vertically pivoted levers, and tension rods connecting said lever to the floating lever.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

JAMES B. MCKIEL.

Witnesses:

CLIFFORD R. BONHAM, B. L. LANGLEY.

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