US2001944A - Brake - Google Patents

Description

C. H. TAYLOR May 21, 1935.

BRAKE Filed May 3, 1928 IHVEHTOR CGCZZETdyZOT BY a ATTORNEY Patented May 21, 1935 alicislij' BendixtBrake Coinpany South B 'end, Ind., a l

wr d li f lll hq i Aiiplibatin May s, 1928, Serial No. 274,698

-invention-relates tel-brakes, and is'illustratd' as embodied; in; an internal expanding brake for an ai'itomobile. object of the in yenti n'iS to providef'asimple'and very power- "fulbrakejpreferably of the type" having one part anchoring when the drum turns in one direction and another-part anchoring when the drum turns in the other direction. One feature of the invention relates 1 to 'intensifying the effect of the brake, by novel means such as levers rorcmg a intermediate portion of thefriction"meansagainst the drum; Preferablythe levers areformed asextensions of a pair cf shoes forming part of the friction means;

aiid whichfor'ce'athird'shoe against the drum,

the levers being arranged to fulcrum by sliding engagement with afliie'd abutment at one side of the drum. In the illustrated brake this abutment is at the opposite side of the drum from an abutment which forms the anchor.

Another important feature relates to novel floating operating means, preferably including floating levers mounted on the ends of the friction means, and connected by a floating rigid link or the like serving as a fulcrum member. These levers may be operated jointly, for example by a third lever which preferably is in disconnected thrust engagement with the floating levers.

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 one illustrative embodiment shown in the accompanying drawing, in which: t

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; and

Figure 2 is a partial section on the line 2-2 of Figure 1, showing part of the applying means.

The illustrated brake includes a rotatable drum [0, at the open side of which is arranged a,stationary support such as a backing plate [2, and within which is'the friction means of the brake. Preferably the friction means includes three novel shoes l4, l6, and la, the shoes l4 and I8 being interchangeable and being generally channel-shaped, while the shoe [6 is T- shaped in cross section. The shoes have outer cylindrical friction faces, to which suitable brake lining 20 is rivetedor otherwise secured.

Shoe I6 is connected at its opposite ends, by means such as floating pivots 22, to shoes l4 and I8, and according to an important feature of the invention the shoes I4 and i8 are extended at their Tower form levers 2 4 constituting brake-intensifying" means-j andflforr'ned withQrounded portion's 15 slidably engaging andkfulcrumingjon? a' flied abutment 281rivetedftobacking plate" I 21'" when the shoes l4 and- I 8 are spreadapart, the lower or-lever' 'portions"turn on'j the abutment 28to force the shoe l6 against the fdru m." F

The brake is applied; against the resistance of one" or more 'returnsprings30fby novel means which preferably includes -a. anof c sfhape'd floating levers 32' and 34 connected to the ends of shoes -l4-and l8 by floatingpivots 36." The fulcrums of these levers are provided; by a rigid fioatinglink 38 or the like connectih theaters? e d 9 the ver fwflfflfafi m te side by side, for disconnected-thrust engageme'iit with a rounded surface on the end of a third lever 49 on a shaft 42 carried by the backing plate and operated by an outside lever 44 and a tension element 46. v

The anchorage of the brake is provided by a fixed abutment 48, formed if desired as a lateral forged extension on a bracket 50 secured to the backing plate I2. When the drum is turning clockwise the shoe l4 anchors on the abutment 48, and when the drum is turning counter-clockwise the shoe l8 anchors on the abutment 48.

It should be noted that, since shoe I6 is forced outwardly while the shoes l4 and I8 are spread apart, the three shoes engage the drum at substantially the same time.

While one illustrative 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 the terms of the appended claims. The applying means described above is claimed in my divisional application No. 733,747, filed July 5, 1934.

I claim:

1. A brake comprising a plurality of floating shoes, in combination with a single abutment slidably engaged by two of the shoes and on which said two shoes pivotally fulcrum to apply another able drum, fixed abutments at opposite sides of the drum, and a floating friction device anchoring at one end on one of the abutments when the drum is turning in one direction and at the other end thereon when the drum is turning in the other direction, and having intensifying means fulcruming on the other of said abutments.

4. A brake comprising, in combination, a rotatable drum, fixed abutments at opposite sides of the drum, and a floating friction device comprising a plurality of shoes one of which anchors on one of the abutments when the drum is turning in on'e direction and another 'of which anchors thereon when the drum is turning in the other direction,

and at least one of which has intensifying means fulcruming on the other of said abutments.

5. A brake comprising, in combination, a drum, a floating friction device :engageable withthe drum and anchoring positively at one end when the drum is turning in one directionand at the other end when the drum is turning in the other direction, and intensifying means carried by the friction device and operating to force'an intera floating friction device engageable with the drum and having one part anchoring positively when the drum is turning in one direction and having another part anchoring positively when the drum is turning in the other direction, and

leverage means carried by the friction device and operating to force a portion of the friction device against the drum.

8. A brake having a fixed abutment, in combination with a pair of shoes having'extensions forming levers slidably fulcrumed on said abutment.

9. A brake having a fixed abutment, in combination with a pair of shoes having extensions forming levers slidably fulcrumed on said abutment, and a third shoe applied bythe fulcruming of said pair of shoes on said abutment.

10. A brake shoe having applying means at one end, and a pivot bearing between its ends, and a rounded thrust portion at its opposite end, in combination'with a stationary part on which said rounded portion slidably fulcrums.

"11 A brake shoe having applying means at one end anda rounded thrust portion at its opposite end, in combination with a stationary part on which said rounded portion slidably fulcrums.

12. A brake friction device having a central friction portion and end friction portions, and means on which the end portions slidablyfulcrum and pivot at their ends to apply the central portion.

13. A brake friction device having a central friction portion and end friction portions, means on which the end portions fulcrum to apply the central portion, and anchorage means for taking the torque of the whole of said device alternatively from one or the other of the end portions.

14. A brake comprising a fulcrum, a shoe disconnectedly pivoting on said fulcrum, and another shoe pivoted to and applied by the first shoe.

CECIL H. TAYLOR.

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