US1632782A - Brake shoe - Google Patents

Description

' June '21, 1927.

V. BEND IX ET AL BRAKE $502;

File'd Dec. 27, 1926 INVENTOR VINCENT BENDIX L ER E. LA BRIE ATTORNEY Patented June 21, 1927.

UNITED STATES PATENT Fries;

VINCENT IBENDIX, OF CHICAGO, ILLINOIS, AND LUDGER E. LA ERIE, 0}? SOUTH BENT),

INDIANA, ASSIGNORS T0 BENDIX BRAKE COMIPANY,

rona'rrouor ILLINOIS.

OF CHICAGO, ILLINOIS, A COR-' BRAKE SHOE.

Application filed December 27, 1926.

This invention relates to brake shoes and is illustrated as embodied in shoes for an internal expanding automobile brake. An object of the invention is to provide improved constructions for such shoes, especially with a view to increasing their strength and facilitating their manufacture.

Various features of novelty relate to building up the shoe from an arcuate band and a separate web member by forming the web member with inclined tongues secured to the face of the band but with the tongue at the end of the shoe flat against the face of the band so that the web at that point is at right angles to the band, to an improvement in the cam-engaging thrust member at the end of the shoe so that it may be embraced between a cam flange and the cam bracket to hold the shoe against lateral movement, to stiffening the anchored end of the shoe by integrally continuing a narrowed part of the band along the pivot arm of the shoe, to stiffening a pair of spaced arms on the shoe which are intended to straddle part of an adjacent shoe by integrally continuing an outer band and preferably forming the band to embrace a part of the adjacent shoe to support it against the lateral movement, and to a novel arrangement of bearing Wash ers secured to part of the shoe to embrace a pivot for the shoe.

The above and other desirable features of construction will be apparent from the following description of the illustrative embodiment shown in the accompanying drawing, in which:

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

Figure 2 is a partial section on the line 2-2 of Figure 1 showing the novel cam plates; I

Figure 3 is a partial section. on the line 3-3 of Figure l and showing a steady rest for one of the shoes;

Figure 4 is a partial elevation of the center shoe, looking in the direction of the arrows 4% of Figure 1 and showing the arrangement of the ab0ve-described tongues;

Figure 5 is a similar elevation at the end of one of the end shoesflooking in the direction of the arrows 5--5 in Figure 1;

Figure 6 is a partial section on the line Serial No. 157,104.

66 of Figure 1 and showing the connection between two of the shoes;

Figure 7 is a section through the center shoe on the line 7--7 of Figure 1;

Figure 8 is a section through one of the end. shoes on the line 8-8 of Figure 1;

Figure 9 is a partial'section on the line 9-9 of Figure Land showing the anchor age of the brake;

Figure 10 is a partial. section on the line 10-1O of Figure 1 and showing the en:- bra'cingof a part of one shoe by the end of the other;

Figure 11 is a section on the line 11--11 of Figures 1 and 10 and showing the overlapping of the two shoes; and

Figure 12 is'a section on the line 19rd? 7 of Figure 1 and showing: the construction. at the end of the shoe.

The illustrated .bralre includes a rotatable drum 20,- at the open side of which is arranged stationary support such as a back- 7 ing plate 22, and Within which are arranged three brake shoes 24, 28, and 28. The shoe 2-1; is anchored on a pivot 30 between. the ends of the shoe 26, while the shoe 26 is anchored on a pivot 32 between the ends of the shoe 24, and the shoe 28 connected to the unanehorcd end of the shoe 26 by a floating pivot 3-1. The brake is applied against the vresistance of a return spring 3610; means such as a double cam 38, the shoe 25 being 5 applied by the shoe 28 against the resistance of an auxiliary return spring 40. The idle position of the shoe 26 is determined by a stop in theform of a grooved eccentric 42 interlocking with a tiange' l on the end of 9 a floating pivot- 34. The shoe 28 is shown as being provided with a steady rest including a pin 46 secured to the backing plate 22 and projecting through an opening in the shoe E28, and having at its end a. pair of washers 9 48 on opposite sides of the shoe and held a by a cotter pin 50. A coil spring 52 is sleeved on the pin to and holds the shoe yieldingly as far outwardly as the cotter pin will permit. The present invention relates to various novel structural features of the brake shoes, whether or not used in this particular brake.

Each of the brake shoes is built up of n outer arcuate bflfidfii, to which the ore lining 56 is riveted or otherwise secure and-one or more separate stiffening members spot-welded or otherwise secured to the in "nor face of the band. Each of the shoes 24 and 28 has a single stiffening member 58 radiall slotted to form inclined tongues 60 which arelaterall bent in opposite directions so that, in" e ect, -as shown in Figure 5, they form two staggered series of tongues 'enga g and spot-welded or otherwise sel0 cure to the inner fac'e of the outer band 54. At the ends of the shoes, however, the member 58 extends perpendicularly against the inner face of the band 54, and is then turned at right angles to form a separate tongue 62 engaging the inner face of the band 54. Thus the band 54 is supported at its center at the end of the shoe. Shoe 26 is provided with two stiifening members 64 and 66 which are formed with alternately bent or staggered tongues '68 correspondingycto the tongues 60. As best shown in Figure 4, the corresponding tongues 68 on the two stiifening members 64 and 66 are preferably bent in the same a 25 direction throughout the greater part 'of the shoe. However, the two end tongues 70 are-both bent outwardly at right angles the same as the tongue 62, so that the ends of the stifi'ening members 64 and 66 are peri pendicular to the inner face of the band 54 of shoe'26: I Y The up er ends of the shoes 24 and 28 q are provided with cam or thrust plates 72 extending across and centrally braced by the ends of the stiffening members 58. Each cam plate then extends back to form two parallelparts and is finally extended into engagement with and secured to the opposite sides of the member 58, so that each cam plate 72 in efiect formsa box-section adapted to be embraced between the bracket 74, in which the cam-shaft is jour'nalled, and a flange 7 6 on the end of the cam 38.. The ends of the shoes, where they are mounted on the] ivots 30, 32, and 34, are preferably provide with hearing washers 78 which are drawn outwardly to form short sleeves adapted to be journalled on the pivots, and which are'notched at their edges to form sets of radially projecting tongues alternating with notches or spaces. Where the shoes are provided with these washers on opposite sides,'as for exam Ie the shoe 24 as shown in or opening in the washer Figure 9, the note on one side is arranged opposite the tongue of the washer on the opposite side, so that the tongue may be spot-welded to the stiffening member 58 with only two thicknesses of metal to be dealt with.

The stifi'ening member 58 of each of the shoes 24 and 28 is continued beyond the lower end of the shoeto form an arm adapted to be mounted on the prefer to stiffen this arm by inte ally continuing a narrowed portion of t e band 54 pivot 30 or 34, and we b substantially to the end of the shoe. This part of thestitlening member 58 pro ec ts at right angles to the member 54, as shown in Figure 11,vand is formed with a flange 80 spot-Welded or otherwisesecured to the in nor i'ace oitlie narrowed continuation of the band 54. It Will be seen that both of the shoes 24 and 28 project pastthe corresponding ends of the shoe 26, the pivot arms at the lower ends of these shoes being straddled by the ends of the stiffening members (it and (51.3. The shoe 26 is also reinforced by continuing the band 54 along the pivot arms formed by continuing the members64 and 66 at the right end of the shoe and offsetting them within the curve of the shoe to be mounted on the pivot or anchor We prefer, however, to form an opening 82 betwebn these continuations of the band 54, for the lower end of the shoe 24, and at the extreme end of the band 54 ofshoe 26 we provide a pair of lugs 84 projecting from opposite sides of the opening 82 into engagement with the opposite sides of the member 58 to position the shoe 24 laterally and sup port it against lateral movement.

lVhile one illustrative embodiment of the invention has been described indet-ail, it is not our intention to limit its scope to that particular embodiment or otherwise than by i the terms of the appended claims.

We claim:

1. A brake shoe built up of an arcuate lining-carryin band and a web member secured to one iace of the band and serving to stiifenit, and in which said web member is throughout a considerable part of its length formed; with inclinedtongues engag- I ing and secured to said face of the band, and

at its end extends substantially perpendicLp V lar to the band with a tongue at right angles to said end engaging and secured to said face of the band.- i

2. A brake shoebuilt up of an arcuate' lining-carrying band and a web member secured to one face of the band and serving to stiffen it, and in which said web mem her is throughout'a considerable part of its length formed with inclined ton ues engagmg and secured to said face 0? the band, and at its end extends substantially perpendicular to the band. 4

3. A brake shoe built up of an arcuate 1min -carrying band and a web member socure to one face of the band and serving to stifi'en it, and in which said web member is throu bout a considerable art of its length ormed with staggered series of tongues inclined in op site directions into enga ement with one ace of the band, and 125 111, w ich said web member at its end ex tendis perpendicularly from said face of the -4. A brake shoe havin a stiffening web, and a thrust member at t lie end of the shoe I? hold'the shoe against lateral movement.

eitendingacross and centrally engaged by the end of said web, then extending at hot sides of the shoe in parallel planes parallel to said web away from the end of the shoe,

and finally extended into en agement with.

and-secured to the opposite si es of said web, thus formin a box'section thrust member "with paralle sides adapted to be embraced tween a cam flange and a cam bracket to 5. A brake shoe comprising an outer arcuate. lining-carrylng band, and a curved stlfiemng web member secured alon its "outer edge to the inner face of the ban and at one end of the shoe continued as a pivot arm offset substantially within the curve of said band, the band being narrowed in width and into rally continued along said offset arm to stiffen it.

6. A brake shoe comprising an outer arcuate band and a pair .of separate s aced stiflenin webs secured to-one face 0 said band an integrally continued at one end of the shoe as spaced mwardly-ofiset pivot arms adapted to strddle a part of an adjacent "shoe, the ban being integrally continued along said spaced arms an slotted to embrace said part of the adjacent shoe and support it laterall 7. A brake shoe comprising an outer arouate band and a pair of spaced stiffenin webs projecting from one face of said ban at least at one endyof the shoe; and integraL 1y continued at said end of the shoe as 'Zpaced inwardly-offset ivot arms adapted to raddle a part of an a jacent shoe, the band being integrally continued along said spaced arms and slotted to embrace said part of the adjacent shoe and'support it laterally.

8. A brake shoe comprising an outer arev nate band and a pair of spaced stiffening webs projecting from one face of said band at least at one end of the shoe and integrally continued at said end of the shoe as spaced mwardly-ofl'set pivot arms adapted to straddle a part of an adjacent shoe, the band being integ ally continued alon saidspace'd arms an "formedbetween said arms, with a relatively wide opening for the passage of said part of the adjacent shoe and with. lugs projecting toward each other from the sidesof said opening near the end of the shoe to engage and support the opposite sides oi said part.

9. A brake shoe comprisingan outer arcuate lining-carrying band and two spaced stiffening members secured to one face of said band and having alternatel -bent tongues engaging and secured to sai face, the corresponding tongues of said two members bein bent in the same direction.

10. A rake shoe having a part formed with anvopenmg, and a' pair of bearing part in line with said opening, the washers having outwardly-extending tongues separated by openings and being arranged with the tongues ofone opposite the openings of the other.

In testimony whereof, we have hereunto signed our names. VINCENT BENDIX.

LUDGER E. LA BRIE.

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