US2326177A - Brake shoe mounting construction - Google Patents

Description

Aug. 10, 1943. s. SCHNELL BRAKE SHOE MOUNTING CONSTRUCTION Filed June 27, 1941 INVENTOR STEVE SCHN E LL BY ATTORNEY FIG. I

Patented Aug. 10, 1943 B AKE-shoe MOUNTING consi'rnoccrron- Steve SchnelltK irkwood, Mm, assignor to Wagner, w Electric Corporation, St. Louis, M0,, ,a ccrpora- V tion of Delaware l Application Jmiezr, 1941-,Se rial-No; scam;

" mel nin. ,(oi se-qs) My-inventionrelates tobrakes and moreparticularly to a brake shoe-mounting construction wherebythe shoe may be mounted on a support, said construction being an improvement over that shown in my Patent No; 2,205,439-iSsued June 25, 1940. M

One ofthe objects of my invention is-to provide an improved" mounting construction for a brake shoe permitting said shoe to be mounted on a support for pivotal movement about a fixed axis and for sliding movementtoward the drum.

Another object of my invention is to provide an improved mounting construction for theend of a T-section brake shoe which Wi'llpermitthe shoe end to have a greater effective anchoring area than that which would be permitted by the normal depth of the end of the web of the shoe when said shoe is made" from rough T-section stock.

Yet another object of my invention is to provide an improvedmounting construction for a shoe end which will permit the pivotal axis of the anchor to be placed a'greater distance from slide toward thedrum in a predetermined'plane' yet have free pivotal'movementabout a fixedaxis.

Other objects ofmy invention will become apparent from the following description taken in connection with the accompanying drawing in 'wl'iich'Fignre 1' is a side View showing my improved brake shoe mountingconstruction, Figure 2 is an end view of the mounting construction; Figure 3' is a sectional view 'takenon the linefi t of Figure 2; Figure l'isa sectional-view taken on'the line-4 4"ofFigure'l; Figure 5 is'a view of the end of the brake shoe showing how theweb-is formed prior'to thewebbeing'shaped to its final construction; and Figurefi is a-view of the end of the shoe as formed before the U-shaped bracket is Welded thereto.

The brake-shoe I is of T-shaped 'cross section made froma piece ofrough T section stock. By means of the T-section'there is provided a Web Q and aiming carrying flange B-to -Whioh-is secured the lining :tfor cooperation with the drum b. i

As shown -in Figurefiytheend of-the T-section stock 6 from which the shoe. is made, has its web portion 2 provided with a cut-out "1, thereby forming legs 8 and t; The leg 8 hasan end surface If! and leg 9 has an end surface ll", said surfaces being at an angle to each other. After theresection stock is formed, as shown in Figure .5, leg 8 is deformed with respect to the web portion by beingbent away from leg 9 and tothe position shown in Figure 6; this position being such" that the surface l6 will be aligned with surface H- on leg 9. Thus it is seen thatby this construction that the effective (overall) depth -01 the-web at its end is considerably increased.

The end of shoe i has secured thereto by welding; a U-shaped bracket i2 provided with legs i3 and 14 and-a base portionl, said legs receiving legs 8 and 9 of the web portion of the shoe. With a the bracket secured to the end of the shoe in the the drum than wouldbe permitted by'the normal face of this block is provided with a groove 20 provided with a curved surface for receiving the ends of legs- Brand S'Which are formed with cooperating curved surfaces (see Figure 4). r In 7 order that the shoe may have relative movement with respect to the anchor pin, legs i3 and i i of the bracket are provided with oversize elongated openings 2| and 22, respectively. It is also noted that because of the oversize opening and 22, the clearance between the block and U-shaped member, and the cooperating curved surfaces of the end of the legs of the web and base of said bracket is spaced-away from the block to-provide a space 2 5 in which is positioned a leaf -spring 26. I his spring holds theends of-the means at the toeend of the shoe.

I 7 legs of the in frictional engagement with the tion, a member secured to the end of the web, an anchor pin carried by the support, an elongated block pivoted adjacent one end on the anchor pin, the axis of said anchor pin being opposite the deformed end of the web and the two end portions of the web engaging the block in a single plane for permitting the shoe to have sliding movement relatively to the block andjtoward the drum when the slioe is engaged with the drum, and means on the member for -cooperat ing with the rear side of the block at engaged with the drum, can have sliding move-- I .ment toward th drum' and in a plane corresponding to that in which the ends ofthe legs of the web lie.- This sliding movement permits the heel end of the shoe to automatically adjust itself so as to compensate for wear of the lining. The adjustment is maintained by the action of the leaf-spring 26 which holds the ends of legs 9 and it of the web in frictional engagement with the block but does not interfere with free pivoting of the shoe.. The springdoes not prevent adjustment from taking place, due to the superior force caused by drum rotation and acting to move the heel end of the shoe into en- .gagement with the drum when the shoe is caused to engage therewith by the usual actuating By forming the end of the web in the manner shown, the effective bearingsurfacebetween the shoe and the block is considerably increased over that which would be available if the depth of the end of the web, as determined by the rough T-section stock, were used. Also, by increasing the effective bearing surface, the anchor pin for the shoe can be placed farther away from the drum thereby increasing the self-energizing action of the shoe when engaged withthe drum.

The construction results in a saving of material as it is not necessary to use a T-section stock which has a web depth as great as the depth of the spread-apart legs. It is old to turn up the entire end of the web to obtain a, high anchor, but such construction weakens the shoe at the heel end. With my construction only a part of the web is turned up and the remaining part (leg 3) remains as originally formed and connected to the flange, thus retaining its maximum strength. The construction also permits the use of a long block wnich has a supporting surface 2d at its rear side opposite the endof leg 5 of the web. Such supporting surface preventsthe turning of of my invention, I do not intend that its'scope be limited except as set forth by the appended claims.

Having fuiiy described my invention, claim as new and desire to secure by Fatentoi the United States is: r I

1. In braking apparatus, adrum, a support, a .T-section brake shoe for cooperation with the what I Letters ,drum and having a portion of the end of its web deformed inwardly away from the remaining p01:-

or eliminates the digging of the a point between the anchor pin and the drum for preventing said block from having relative rotary movement with respect to the shoe,

1 2-. In braking apparatus, a drum, a support, a

-Ts'ection brake shoe for cooperation with the drum and having a portion of the end of its web deformed inwardly from the remaining portion, a U-shaped member secured to the end of-the web and forming a slot, an anchor pin carried by the support, a block pivoted on the anchor pin and positioned in'the slot so as to surface of the block and prevent it from having relative rotation with respect to the shoe.

, In braking apparatus, a drum, a support, an anchor pin carried by the support, a T-section brake shoe; a U-shaped' member secured to the end of the webof the shoe and forming therewith a slot, a block pivoted on the anchor pin and positioned in the slot for abutting engage ment by the end of the web of the shoe, said U-shaped member being constructed to permit the shoe to have sliding movement relatively to the block and toward the drum during braking action, and a spring interposed between the base 'of the U-shaped member and the block for niain- 't'o'l't'he shoe. N i i. In braking apparatus, a drum, a support, an

anchor pin carried by the support, a, T-s'ection' 'brakeshce 'a member secured to. the shoe and forming with the end of the web a slot of greater width than the web, a block pivoted on the anchor pin and positioned in the slot, the forward edge of said block being of greater width than the web andprovided with a straight groove in which is received the end of said web for sliding movement toward the drum during braking action, and a spring cooperating with the member and the rear edge of the block for maintaining frictional engagement. between the end of the web and the grooved surface of the block. 7

5. In braking apparatus, a drum, a support, an anchor pin carried by the support, a T-sectiOn brake shoe having aportion of the end of its web deformed away from the remaining portion to increase its eifective overall depth at said end, a U-shapedmember secured to theend of the Web and forming therewith an elongated slot, an elongated block pivoted adjacent one end on the anchor pin, and positioned in the slot, said block being engaged by the ends of the two portions of the web and said member being constructed to permit the end of the shoe to have relative movement with respect to the block and toward the drum in a selected plane, a spring interposed between the base portion of the U-shaped member and the block and maintaining the ends of the two portions of the web in frictional engagement with the block, and means on the U-shaped memher for cooperating with the block at apoint spaced from its pivotal axis for preventing said block from having relative pivotal movement with respect to the shoe.

6. In braking apparatus, a drum, a support, an anchor pin carried by the support, a T-section brake shoe having a portion of the end of its web deformed away from the remaining portion to increase its effective overall depth at said end, a U-shaped member secured to the end of the web and forming therewith an elongated slot, 7 an elongated block pivoted adjacent one end on the anchor pin and positioned in'the slot, said block being provided with a grooved edge having a straight bottom engaged by the ends of the two portions of the web and said member being constructed to permit the end of the shoe to have relative movement with respect to the block and toward the drum in a selected plane,'a leaf-spring interposed between the base portion of the U- shaped member and the rear edge of the block and maintaining the ends of the two portions of the web in frictional engagement with the groove of the block, and means on the U-shaped member for cooperating with the block at a point spaced from its pivotal axis for preventing said block from having relative pivotal movement with respect to the shoe.

. '7. In braking apparatus, a drum, a support, an

anchor pin carried by the support, a T-section brake shoe having a straight end edge, a block pivoted on the anchor pin and provided in the edge surfacethereof adjacent the shoe with a straight groove for receiving the end of the shoe web and permitting the shoe to have sliding movement in a selected plane toward the drum during braking action, said groove having its bottom surface curved and the end surface of anchor pin carried by the support, a T-section brake shoe having a straight end edge, a U- shaped member secured to the end of the shoe and forming with the end of the web a slot of greater width than the web, a block pivoted on the anchor pin and positioned in the slot, said block also being of greater width than the web and provided on its forward edge adjacent the shoe with a straight groove for receiving the end of the shoe web and permitting said shoe to have sliding movement in a selected plane toward the drum during braking action, said groove havin its bottom surface curved and the end surface of the web being provided with a cooperating like surface to thus permit the shoe to have a limited lateral turning movement with respect to the block and without substantial decrease of the areas of the surfaces in contact, and a leaf-spring cooperating with the member and the rear edge of the block for maintaining frictional engagement between the conctacting curved surfaces.

9. In braking apparatus, a drum, a support, a T-section brake shoe for coperation with the drum and being made from T-section stock in which the leg thereof forms the web of the finished shoe and is of substantially uniform depth, said stock having a portion of one end of its leg deformed away from the remaining portion thereby causing one end of the shoe web to have an overall depth greater than that of the leg of the stock, a member secured to both parts of the end of the web and forming a slot, an anchor pin carried by the support, and a block pivoted on the anchor pin and positioned in the slot so as to be engaged by both the end of the deformed part of the web and the end of the remaining portion, the axis of said anchor pin being opposite the deformed end of the web and the cooperating surfaces of the block and web being such as to permit the end of the shoe to have sliding movement toward the drum relatively to the block and in a selected plane when the shoe is engaged with the drum.

10. In brakin. apparatus, a drum, a support, a T-section brake shoe for cooperation with the drum and being made from T-sectionstock in which the leg thereof forms the web of the finished shoe and is of substantially uniform depth. said stock having a portion of one end of its le deformed away from the remaining portion thereby causing one end of the shoe web to have an overall width greater than that of the leg of the stock, a member secured to both parts of the end of the web, an anchor pin carried by the support, and means for pivotally mounting said member on the anchor pin. the axis of said pin being positioned opposite the end of the deformed portion and spaced inwardly from the brake drum a distance at least as great as the distance from the drum to the inner edge of the web which is not deformed.

STEVE SCHNELL.

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