US1876089A

US1876089A - Brake

Info

Publication number: US1876089A
Application number: US492277A
Authority: US
Inventors: James Robert T St
Original assignee: Bendix Brake Co
Current assignee: Bendix Brake Co
Priority date: 1930-10-30
Filing date: 1930-10-30
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

R. 1:. ST. JAMES Sept. 6, 1932.

BRAKE Filed Oct. 30. 1930 INVENTOR ma l 7. (Si china BY,

Patented Sept. 6, 1932 I UNITED STATES PATENT OFFICE ROBERT '1". ST. JAMES, OF CHICAGO, ILLINOIS, ASSIGNOR T0 BENDIX BRAKE COMPANY,

OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS Application filed October 80, 1980. Serial No. 492,277.

in a rounded notch forming one angle of an opening in one of the shoe ends, the opening preferably being generally triangular in outline so that it affords clearance for the movement of the cam in applying and releasing the brake. Preferably, the two ends of the friction means are arranged side by side and there is a generally triangular opening in each of the ends, with the apex of each opening opposite the base of the other so that a cam projecting through the openings may have its oppositely directed ends or lobes fitting into and operatively journaled in the rounded seats formed at the apexes of these triangular openings. Thus the cam moves the shoes or their e uivalents positively in both directions in app ying and releasing the brake so that there is no possibility of a shoe dragging when the brake is released.

The above and other objects and features of the invention, including various novel and desirable details of constructiomwill be apparent from the following description of the illustrative embodiment shown in the accompanying drawing, in which:

Figure 1 is a vertical section through the brake just inside the head of the brake drum and showing the brake shoes in side elevation;

Figure 2 is a partial section on the line 22 of Figure 1 and showing the mounting of the cam; and

Figure 3 is a partial section on the line 33 of Figure 2, but on a larger scale and showing a modified shape of opening in the ends of the shoes.

The illustrated brake includes a rotatable drum 10, at the open side of which 1s a suit able support such as a backing plate 12 and within which is arranged the friction means of the brake. The illustrated friction means includes a pair of shoes 14 notched at their I lower ends to embrace a fixed anchor 16 carried by the backing plate 12 and against which the shoe ends are held by a spring 18 tensioned between the shoes. v

According to the present invention, the upper ends of the webs of the shoes are oil'- set sufiiciently so that they extend past each other and are arranged side by side. These ends are formed with openings 20, generally triangular in outline, through which there extends an operating cam 22 shown as mounted on a cam shaft 24 journaled in the bearing 26 carried by the backing plate12.

In the arrangement of Figure 1, the upper apex of the opening 20 in the righthand shoe 14 and the lower apex of the opening 20 in the lefthand shoe 14 are formed as rounded seats into which there fit the rounded opposite lobes of the cam 22. When the brake is released, in this particular arrangement, the side of the cam is engaged by one side of each of the openings 20. It will be seen that the lobes of the cam 22 not only apply the shoes positively when it forces them the shoe ends. In this case the openings 120' are generally in the form of equilateral triangles so that the side of the opening does not engage the cam when the brake is released and the position of the shoe is determined entirely by the rounded notch or seat at the apex of its opening 120 which is journaled on the upper or lower end of the cam 122.

While two illustrative embodiments of the. invention have been described in detail, it is not my intention to limit its scope to those particular embodiments or otherwise than by the terms of the appended claims.

I claim 1. A brake comprising friction means having adjacent relatively movable ends 'ar-- ranged side by side and an o erating cam acting on said ends, said ends ing formed with openings embracing said camso that the cam moves the ends. positively in both directions.

2. A brake friction device havin in its m end an opening generally triangular in form with its apex formed as a rounded seat, in combination with a cam projecting into said 0 ning and having an'operating portion fitting into and journaled in said seat. 1 3. A brake comprising friction means havin its ends arranged side by side, said ends being formed with openings of oppositely dis- I posed nerally triangular outlines, the apex of eac of said triangles being opposite the a base of the other and eing rounded to form a seat, in combination with a cam projecting into said openings and having operating'portions on o posite sides of its axis and which fit into an are journaled in said seats '33 respectively.

In testimony whereof, I have hereunto signed my name.

, ROBERT T. ST. JAMES.