US1699539A

US1699539A - Brake

Info

Publication number: US1699539A
Application number: US173245A
Authority: US
Inventors: Howard M Leonard
Original assignee: Bendix Brake Co
Current assignee: Bendix Brake Co
Priority date: 1927-03-07
Filing date: 1927-03-07
Publication date: 1929-01-22
Anticipated expiration: 1946-01-22

Description

Patented Jan. 22, 1929.

UNITED STATES 1,699,339 PATENT OFFICE.

HOWARD M. LEONARD, OF SOUTH BEND, INDIANA, ASSIGNOR T BENDIX BRAKE COM#` A PANY, OF CHICAGO, ILLINOIS,

A CORPORATION or ILLINOIS.

BRAKE.

l.ippimimion ined March 7, 1927. serial No. 173,245.

This invention relates to brakes, and is illustrated as embodiedin an internal expanding brake of the type having three floating shoes arranged end to end Within the drum.

Various features 0f novelty relate to applying means including a pair of levers aet Y ing on two of the shoes (or on equivalent friction means) and one of which operates a third lever, to novel torque-taking devices arranged to wedge the shoes against the drum, to a new form of applying or expanding cam, and to other novel and desirable particular constructions which will be apparent fr om the followingdescription of the illustrative embodiment shown in the accompanying drawing, in which:y

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

- and Figure 2 is a partial sectionon the line 2-2 of Figure 1, showing the' spring arrangement.

The brake includes generally a rotatable drum 10, atthe open side of which is the lusual backing plate or other support 12, and within which is arranged the friction means, which is shown as including threel floating interchangeable shoes 14, 1 6, and 18, each approximately 120O in length, arranged end to end.

At each end of cacltshoe is a double-wedge recess 20 facing toward ithe center of the drum, and within each're'cess there is a part such a roller 22 -iiiounted 0n the backing plate 12. Rollers22-have three functions.: (1) they positionthe shoes when the brake is released; they talie the braking torque; and (3) t ey wedge-the shoes against the drum as they tend to turn with the drum' when the brake is applied. p

A- spring 24 is .connected directly at its right end to the lower end of shoe 14 and by a clip 26 slidable on its end it supports the right eiidof shoe 16,-i. e. outward movement of shoe 16 acts through clifp 26 to distort spring 24 crosswise. At its le t end, spring 24 is directly connected to the lower end of shoe 18, and a second clip 28 serves to support the left end of shoe 16. A second spring 30 is directly connected at its lower end to the left end of shoe 16, while its upper end is connected directly to the upper end of shoe 18, and by a clip 32 is also-connected to the upper end of shoe 14. i

Shoe 14 is applied by a lever 34 mounted the terms of the 'appended claims.

at its lower end on a pivot 36 carried by backing plate 12, and preferably having a roller or other part 38 having rolling engagement with the shoe approximately at its cen It will be seen that all three shoes are ap` y plied by forcing apart the upper ends of thev pair of

levers

34 and 40. For' this purpose s I provide a novel cam or expanding' device.

54, integral with or secured to the usual camshaft. This device has one projection 56 extending betwecn the ends of the levers and serving a cani acting on lever 40 to apply shoe 18 (and 16),.and a second projection 58 on the opposite side of the end of lever 34 and serving as a cani acting on that lever to apply shoe 14. The two projections define a notch receiving the end of lever 34 l/Vhile oneillustrative embodiment has been described in detail, it is not my intention to limit the scope of the invention to that particular embodiment, or otherwise than by l claiiji'i: ,l 1. A brake coniprisii'ig, in combination, a drum, at least three ,shoes' arranged end to end within the-druin, a pair of levers arranged to be forced apart to apply two ofthe shoes,

and a third lever operated by one of said pair 9 olf levers and arranged to apply thethird s oe.

2. A brake comprising, in combination, a drum, at least three shoes. arranged end to end within the drum,.a pair of levers pivoted near their ends and arranged to be forced apart to apply two ofthe shoes and one of which has a part extending beyond its pivot, and a third lever operated by said-part and arranged to-apply the third shoe. l

lflO

3. A brake comprising, in combination, a A

drum, at least three shoes arranged end to end within the drum', a pair of levers pivoted Inear their ends and arranged to be forced apart to apply two of the shoes and one of 'relie-h has apart extending f engagingsaidxpart at one end andthe third slioe at the'other end.

4, A brake comprising, in combination, a.

drum, friction means-engageable with .the drum, al air of levers having rollers between their en -s which act on the friction means, a third lever operatively engaged by one of the pair of levers and which also has a roller acting on the friction means, and means :tor forcing the'pairo levers in opposite directions to cause the three rollers to force the friction means against the drum.

5. A brake comprising, in combination.4 a drum, friction means engagcable with the drum, a pair of levers having parts'which act onthe frictionmeans, a third lever operatively enga ed by o'rieo'f the pair of levers and which also has'a'part acting on the friction means, and meansy for forcing the pair of levers in opposite directions to cause the three said parts to force the friction means against the drum.

6. A brake comprising, in combination, a drum, a lurality of unconnected floating segmental s oes arranged end to end within the drum and 'eaclnof which has at each end a Abraking torque? duble-wedge recess facing toward the center of the drum, agpaa-t ineach recess to take the dat `the'sam'e time to Wedge l the shoe againsti'tl-ie drum, and a corresponding plurality'ofifinterconnected levers acting on the threefshoes approximately at their centers toforce th'em against the drum;

.7. Brake-applying meansfcomprising, iin combination, a pair of pivoted parts having their free ends adjacent each other, anda rotatable applying device between said ends having a projection extending between said ends and serving' as a cam acting one one of said ends and having a second projection on the opposite side of the other of said ends and acting as a cani thercagainst, the two projections defining a notch in which said other at least one of theother levers being"arrangeq.k K

to be operated solely by saidone oftlie levers:

9. Brake-applying means for a bralrelh'zw-L ing' a drum, comprlsing a Alever arralng'ebl",-

fulcrnn'ied between its within the drinn and ends, operating incanSat one end of said lever,

a brake-ap lying'tpart between said means and the fu cruinr of the lever, `and another lever having another brake-applying part 'and which is operated by thelirst lever..

in combination,

10. A brake comprising, a drum, a plurali'tyof unconnected floating segmental shoes arranged end to end Within the drum, and a plurality of operating devi ces, one for each shoe, at least one of which, l

devices is'operated solely by one of the other devices. 'v'

11. A brake comprising, in combination, a drum, a plurality of shoes arranged end to end within the drum', and a plurality of operating devices' one for each shoe, at least one of which devices is operated solely by one of the other devices. y K p .In testimony -whereof, I have hereunto signed my name.

HOWARD 1st-LEONARD;