US1875345A

US1875345A - Brake

Info

Publication number: US1875345A
Authority: US
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

L. E. LA BRIE Sept. 6, 1932.

BRAKE Filed Oct. 12, 1928 2 Sheets-Sheet m m T A NIL g m R E G D u L ATTOR N EY Patented Sept. 6,1932

LUDGER n. LA BRIE, or sou'rn ,ZBENZD, INDIANA, ASSIGNOR TO BENDIX BRAKE COM} rm, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE Application filed October 12, 1928. Serial No. 812,114.

This invention relates to brakes, and is illustrated as embodied in an internal expanding automobilebrake of the three-shoe servo type. An object of the invention is to provide an improved anchorage permitting one or both of the anchored shoes to seat fully against the drum, preferably by allowing the heels of the shoes to move outward slightly toward the drum.

With this object in view, the anchorage comprises a novel linkage, fully described below, arranged to permit the desired shoe movement. Preferably the anchoring linkage engages the shoe between its ends, and the end of the shoe nearest the anchor'is provided with novel stop means for determining its released position. In one desirable arrangement, an auxiliary shoe is pivoted to the shoe which is mounted on the anchoring linkage,

so that the heels of the two shoes move in unison. The two illustrated forms of anchorlinkage also embody substantial novelty'in and of themselves. 7

The above and other objects and features of the invention, including various novel and desirable details of construction, will be apparent from the following description of the illustrative embodiments shown in the accompanying drawings, in which:

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

Figure 2 1s a partial section on the line 22 of Figure 1, showing the brake anchorage;

Figures 3, 4, and 5 are respectively partial sections on the lines 33, 44, and 5'5 of Figure 2, showin in side elevation respectively the anchore end of the secondary shoe of the brake, the anchorage linkage, and the anchored end of the auxiliary shoe;

Figure 6 is a view corresponding to part of Figure 1, but showing only the anchored ends of the secondary and auxiliary shoes, with a modified linkage Figure 7 is a partial section on the line 77 of Figure 6 showing the brake anchorage;

Figures 8, 9-, and 10 are views corresponding respectively to Figures 3, 4, and 5, but showingthe modification of F igui'e 6; and

Figure 11 is a partial section on the line 11-11 of Figure 1, showing the connection between primary and secondary shoes.

The brake illustrated in Figure 1 includes a rotatable drum 10, at the open side of which is a support such as a backing plate 12, and

within which is arranged the friction means of the brake. In this particular brake the friction means includes a primary shoe 14, an anchored secondary shoe 16 to which the primary shoe is connected by means such as a floating pivot 18, and an anchored auxiliary shoe 20. The secondary shoe 16-has a pair of spaced-stiffening webs straddling the ends of the webs of

shoes

14 and 20, and the

shoes

14 and 20 may if desired be interchangeable The secondary shoe is shown provided with a steady rest 22.

The brake is applied by means such as a double

cam'24 forcmg shoes

14 and 20 apart against the resistance of a return spring 26 tensioned between them, the secondary shoe 16 being applied by the primary shoe 14 against the resistance of an auxiliary return spring 28.

Shoe 16 may be guided'during the application of the brake by predetennining the path of shoe 14 to which it is connected. For

example, shoe '14 may be provided with an opening-or cam slot 30, the inner edge of which engages a guide .formed as a rounded lateral projection 32 on the end of a stamped steel lever arm 34" secured fixedly but adjustably to the backing plate by a bolt 36 or the like, The upper end of spring 28 may be connected to the guide arm 34, as shown, or a se arate spring may be rovided if desired.

n the operation of t is device, the frst time the brake is applied after installation, the bolt 36 is loosened so that the inner edge of slot 30 may shift the guide arm 34 to its correctposition when the brake is applied, spring 28 serving to hold projection 32 against the edge of slot 30fduri'ng this time.

the released position 'of the anchored end of With the-brake so applied, bolt 36 is tightened, to preserve throughout the life of the brake the adjustment so made.

This guide is not claimed herein, as it is the invention of Roy S. Sanford and A. Y.

. Dodge, and is claimed in their applications Nos. 233,754, filed Nov. 17, 1927, and 312,039

filed Oct. 12, 1928.

The present invention has to do with the anchorage of the brake. In'the arrangement of Figures 1-5, the secondary shoe 16, the

webs of which maybe reinforced by plates 40 welded to their sides, is anchored by being connected by a transverse pivot 42 to a pair of links 44 between the webs ofthe shoe, which links in turn are pivoted on a fixed an'-. chor 46 carried by the backing plate. .Anchor 46 may be pressed through one or a pair of reinforcing plates '48 bolted to the backing plate.

In order to position the shoe 16 properly when the brake is released, it may be formed at its end with radial slots 50 embracing the anchor 46, the shoe being urged away from the drum by a. spring 52 connected to its end. Thus, as shown in Figure 3, the'outer ends of slots 50 serve in effect as a

stop determining shoes

16 and 20 are constrained to move. toward and from the drum in unison. The

harder shoes

14 and 16 wedge themselves against the drum when the brake is applied with thecar moving forward and the drum turning counter-clockwise, the more the heel of shoe 20 is forced outward againstthe drum, thus increasing the efiectivenex of shoe 20 and supporting the drum against distortion.

In reverse, the angle of thrust of shoe 20 .on pivot 58 is such as to tend to swing links.

44 outwardly, to. force the heels of

shoes

16 and 20 against the drum, thus giving asubstantial servo effect even in reverse.

In the arrangement of Figures 6-10, in which many of the advantages of the abovedescribed arrangement are retained, the secondary shoe 16is directly pivoted on a fixed anchor pming through a relatively large opening 72in shoe 20, while the auxiliary shoe 20 is anchored on short links 74 pivoted on anchpr'70 and connectedto shoe 20. by a transverse pivot .76.

The lower end of Shoe 20 is formed with a radial slot 78 embracing a transversepivot 80 carried by the spaced webs of shoe 16, and serving in eifect as a stop to determine the released position of the heel of shoe 20.

The above-described arrangements are similar in some respects to those ofPatent No. 1,566,954, granted December 22, 1925, of ap plication No. 284,576, filed June 11, 1928, and of a plication No. 267 ,860,-filed April 6, 1928. is not my intention to claim these .priorconstructions, or on the other hand to limit my invention to the particular embodiaments herein illustrated, or otherwise than by the terms of the appended claims.

I claim:

1. A brake comprising, in combination, a fixed anchor, I a shoe, angularly-movable means linking theshoe to said anchor, and an auxiliary shoe on the opposite side of the anchor from the first shoe and pivotally connected to said first shoe in such a manner that. the torque of both shoes is transmitted -to.the anchor by said means.

2. A brake comprising, in combination, a fixed anchor, a shoe, angularly-movable link members linking the shoe to said anchor, and an auxiliary shoe on the opposite' side of the anchor from the first shoe and piv otally connected to said "first shoe in such a manner that the torque of both shoes is transmitted to the anchor by said link members.

3. A'brake comprising, in combination, a fixed anchor, a shoe, angularly-movable means linking the shoe to said anchor, and an auxiliary shoe pivotally connected to said first shoe adjacent its anchored end in such a manner that the torque of both shoes is transmitted to the anchor by said means.

4.A brake comprising, in combination, a shoe, an anchor linkage pivotally connected to said shoe adjacent one end, an anchor for said linkage, and interconnected means between the shoe and anchor serving in effect as a stop to limit the brake-releasing move- 1111181113 of the end of the shoe nearest said anc or.

I 5. A brake comprising, in combination, a shoe, an anchor linkage pivotally connected to said shoe between-its ends,-and an anchor for said linkage, a part of the shoe engaging said anchorand-serving in effect as a stop to limit the brake-releasing movement of the end of the shoe nearest said anchor.

6. A brake comprising, in combination, an anchor, a shoe having 'a radial slot at its end movably embracing ,said anchor, and thrust-"transmitting means pivoted to an intermediate part ofthe shoe and mounted on said anchor.

7.- A brake comprising, in combination, an

anchor, a shoehaving a radial'slot at its end mo'v'ably. embracing said anchor, thrusttransmitting means pivoted to an' intermediatepart of the shoe and mounted on said anchor, and an auxiliary shoe'on theop'msite side of the anchor from the first shoe hairing a part extending past the anchor and connected to the first shoe.

8. A brake comprising, in combination, an anchor, a shoe having a radial slot at its end mova-bly embracing said anchor, and thrusttransmrtting means pivoted to an intermediate part of the shoe and mounted 'on said anchor, together with a spring acting on the shoe and urging the slotted end inwardly as ed to the first s oe, together with a floating primary shoe connected to the first shoe and applying means acting on the primary and auxiliary shoe.

10. A brake comprising a shoe having an intermediate part linked to a fixed anchor and having a slot receivin the anchor to serve as astop to determine t e released position of the end of the shoenearest the anchor.

11. A brake comprising a shoe having an intermediate part linked to a fixed anchor and having a slot receivin the anchor to serve as a stop to determine t e released position of the end of the shoe nearest the anchor, together with a sprin urging said end of the shoe toward said re eased position.

12. A brake comprising, in combination, an anchor, a shoe hav ng spaced webs formed at their ends with slots embracing said anchor, links between said webs ivoted at their ends to the anchor and to the s oe, and an auxiliary shoe having a single web extending between said links and connected to the spaced webs of the first shoe by a pivot extending through enlarged openings in the links.

13. A brake comprising, in combination, an

anchor, a shoe having spaced webs formed at their ends with slots embracing said anchor, links between said webs pivoted at their ends to the anchor and to the shoe, and an auxiliary shoe having a single web extending between said links and connected to the first shoe.

14. A brake comprising, in combination, an anchor, a shoe having spaced webs, links between said webs pivoted at their ends to the anchor and to the shoe, and an auxiliary shoe having-a single web extending between said links and connected to the spaced webs of the first shoe by a pivot extending through enlarged openings in the links.

15. A brake comprising two pivotally-connected overlapping shoes and a link serving as an anchorage for at least one of said shoes in both forward and reverse braking.

16. A brake comprising two pivotally-connected overlapping shoe and a linkage serving as an anchorage for both of said shoes in both forward and reverse braking.

17. Abrake comprising, in combination, an anchor, a shoe pivoted at one end on the anchor, an auxiliary shoe on the other side 7 of the anchor from the first shoe and which is formed with a slot at its end, a transverse pin carried by the first shoe and extending through said slot, and links pivotally connecting an intermediate part of the auxiliary (6 shoe to the anchor.

In testimony whereof, I have hereunto signed my name.

' LUDGER E. LA BRIE.