US758176A - Brake-head for car-brakes. - Google Patents

Description

PAT-ENTED @1126; 1904;

I J, H. GRAHAM; BRAKE HEAD FOR GAR BRAKES.

Ammonia nun mu 5, 19oz.

2 SHEETS-SHEET 1.

N0 MODEL.

.P-A'TENTED APR. 26, 1904.

' .J. H. GRAHAM. v

BRAKE HEAD FOR GAB. BRAKES.

APPLICATION FILED MAY 5, 1902. N0 MODEL. 2 SHEETS-Balm! 2.

UNITED STATES Patented April 26, 1904.

A T FI E-5i PAYNE GRAY, OF NEWTON, MASSACHUSETTS.

BRAKE-HEAD FOR CAR-BRAKES.

SPECIFICATION forming part of Letters Patent 110,758,176, dated April 26, 1904.

' Application filed May 6, 1902. Serial No. 105,921 (No model.) i

T0 aZZ whom it may concern:

Be it known that I, J OHN H. G AHAM, a citi:

zen of the United States, and a resident of Boston, county of Suffolk, State of M assachusetts, have invented an Improvement in Brake- Heads for Car-Brakes, of which the following description, in connection with the accompanying drawings, is .a specification, like figures on the drawings representing like parts.

In car-brakes as usually constructed the truck-frame has suspended from each end thereof a brake-beam carrying at its ends brake-heads which in turn support the brakeshoes. Usually the brake-beam is connected to the truck by means of links, and the point of connection between the link and the brakehead is situated at a considerable distance back of the frictional surface of the brakeshoe. are applied and friction generated between the brake-shoes and the wheels the resistance tothe tendency of the brake-shoes to move vertically, due to the friction between the shoes and the wheels, is applied to the brakebeam at such a distance from the frictional surfaces as to cause the brakes to chatter.

It is the object of this invention to overcome this objectionable chattering when the tion of brake which will be most effective in its application, and this I accomplish by providing each brake-head with means situated substantially in the plane of the braking-surface for securing the hanger directly thereto. Since the point of connection between the hanger and the brake-head is situated as nearly as possible in the plane of the friction-surface of the brake-shoe, the result is that the resistance to the vertical movement of the brakes caused by the friction between the shoes and the wheel is applied substantially at the point where the friction occurs and where it is most effective.

In the preferred embodiment of my invention I have provided the brake-head with a ledge or flange to which the hanger may be secured, which ledge or flange projects toward the front side of the brake-head or that side The consequence is that as the brakes wooden brake-beam, the ledge or flangeswill; preferably be extended from a vertical :back

to which the brake-shoes are attached, this construction bringing the point of connection between the hanger and brake-head approximately in the plane of the frictional surface.

Figure 1 is a side View. of a portion of the" car-truck, showing a brake apparatus having my improved brake-head. Fig. Zis a perspective view of the front side of the brakehead with the. brake-shoe removed. Fig. 3 is a perspective View of the back side of the brake-head constructed for use in connection with the wooden brake-beam. Fig. 4 is a similar view of a brake-head such as is used with the National hollow brake beam. Fig. 5 shows one way in which the brake-head may be suspended from the truck. 7 V

The brake-head is designatedgenerally by 3 and at its front side will have. the usual means for supporting the brake-shoe 4:.

In Figs. 1, 2, and 3 a brake-head adapted for use in connection with the ordinary wooden brake-beam 5 is illustrated, and in said figures the brake-head has at its back side the usual flanges 6, which embrace the brake-beam and are secured to said brake-beam in the usual well-known way. On one of the side faces, preferably the outer face 7, the head has a projecting flange or ledge 8, which extends forwardly toward the brake-shoe and wheel or toward thefront side of the brake-head, said shelf or ledge having the hanger which supports the brakemechanism secured there- VVhere the brake-head is adapted for the piece or ear 9, which extends outwardly from the face 7 and against whiohthe end of the brake-beam 5 rests. Where the brake-head, however, is adapted for use with Y the .w'ellknown National hollow brake-beam, the shelf or ledge 8 will project directly from the side of the head, .as seen in Figqi. 1

While it is within the scope of my invention to use any usual or suitable hanger device for suspending the brake-head and brake-beam from the truck, yet I prefer to employ arigid hanger member 10 instead of the usual link commonly employed, as such rigid hanger serves to hold the brake-head more steadily in its proper position and prevents chattering. As herein illustrated, the hanger 10 comprises a screw-threaded rod or bolt, which is suspended from the truck, as will be presently described, and which passes through an aperture 11 in the supporting-flange 8, said hanger being clamped to the supporting-flange by means of nuts 12. Preferably I will interpose between the flange and each nut 12 a washer 13, of some suitable elastic material. The hanger may be suspended from the truckframe in any suitable way, but preferably the same is provided at its upper end with an eye 14, which is slidingly fitted over the supporting-arm 15, secured to the truck. The said arm 15 may either be rigidly secured to the end of the truck, as shown in Fig. 1, or the same may be fulcrumed upon the car-axle, as in my copending application, Serial No. 105,922, filed May 5, 1902, and as shown in Fig. 5, the advantage of this latter construction being that the application of the brakes does not cause the truck-frame to tip, as is the case where the force of the-vertical movement of the brake-shoes, due to the frictional contact between the same and the wheels, is transmitted directly to the end of the truckframe, as in Fig. 1.

It will be observed from the foregoing that the point at which the brake-heads are secured to the hanger is situated substantially in the plane of the frictional surfaces, and therefore the resisting force which prevents the vertical movement of the brake-shoes when the brakes are applied is applied directly to the brake-head and at the point where it is most effective to prevent chattering of the brakes. It is also a decided advantage to have this force applied di rectly to the brake-head instead of to the brakehead through the brake-beam, for a substantially rigid connection is thereby thus made between the hanger and the brake-head. A further advantage from this structure is derivedv from the fact that the brake-head is so constructed that the point of attachment between the same and the hanger is situated in the longitudinal plane of the supporting-arm. This is made possible by the special construction of brake-head, and it prevents any distortion or twisting of the supporting-arms when the brakes are applied.

Believing thatI am the first to devise a brake apparatus wherein the hanger is secured directly to the brake-head at a point in front of the brake-beam, I desire to claim the same broadly, and would consider as coming within my invention any brake-head having means for securing the same directly to the hanger at a point in front of the brake-beam and substantially in the plane of the braking-surfaces without regard to the precise construction of brake-head or the specific form of hanger em: ployed.

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

1. A brake-head adapted to support a brakeshoe, and having means to secure a hanger directly thereto,said means being situated on one side of the brake-head.

2. A brake-head, a brake beam secured thereto and a hanger secured directly to the brake-head at its outer side.

3. A brake-head having means to secure a brake-beam to the back side thereof, and means to secure a hanger to the outer side thereof.

4. Abrake-head having a supporting-flange projecting forwardly from the outer side there of, said flange being adapted to be secured to a hanger.

5. In a brake apparatus, a brake-head having a supporting-flange projecting forwardly from the side thereof, and a hanger suspended from the car-truck and secured directly to the said flange, the construction being such that the point of connection between the hanger and the brake-head is substantially in the plane of the braking-surface.

6. In a brake apparatus, a truck-frame, a hanger suspended therefrom, and a brake-head connected directly to said hanger, the point of 7 connection between the hanger and brake-head being situated at one side of the longitudinal plane of the car-wheel.

7. In combination in a brake mechanism, a brake-head provided with a laterally-extending flange; a hanger rigidly secured to said flange and loosely suspended from a springcontrolled beam mounted upon the car-truck; said beam; and said car-truck.

8. A brake-head adapted to support abrake shoe and having a laterally-extended flange provided with an eye for the attachment of the brake-head to a hanger.

9. In a brake apparatus, a brake-head having a laterally extending flange projecting from one side thereof, and a hanger supported by the car-truck and secured directly to the said flange.

10. Ina brake apparatus, a truck-frame, a hanger suspended therefrom, and a brakehead having a laterally-extended flange to which the hanger is secured.

11. A brake-head adapted to support a brake-shoe andhaving a laterally-extending brake-head and a vertical hanger therefor secured thereto in front of the brake-beam and in immediate proximity to the shoe-face of said brake-head; said hanger being thereby adapted to transmitvertioally and directly the frictional stresses; and said brake-beam.

15. In combination in a brake mechanism, a brake-head and a hanger therefor rigidly secured thereto in front of the brake-beam and in immediate proximity to the shoe-face of said brake-head; and said brake-beam.

16. In combination in a brake mechanism, a brake-head and a hanger therefor rigidly secured thereto in immediate proximity to the shoe-face thereof and in front of the brakescribing Witnesses.

JOHN H. GRAHAM. Witnesses:

JOHN G. EDWARDS, LOUIS 0. SMITH.

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