US1756975A - Brake - Google Patents

Description

A. Y. DODGE May 6, 1930.

BRAKE Filed Feb. 4, 1926 I A M M. M W

Fla. 2

'INVENTOR ADlEL Y. DODGE BY J:

ATTORNEY Patent May 5, i936 ADE-1L Y. JDQIDEE, 011? SOUTH. BEND, INDLdNA, AQSIGNUR TU BEITDIX FZBHAKJE GQMPAHY, BF GEIGAGU, ILIDXNOKS, A QJDRE'GRA'IEL'ON Us? ILLINGIS linplication filed February it, i926. Serial no. $5,945.

This invention relates to brakes, and is iliustrated as embodied in an internal expand ing automobile brake. An object of the invention is to improve the efficiency of a brake of the type in which one shoe forces another against the drum. Preferably the first shoe is anchored at one end,-well within the curve of the shoes in the brake illustrated,- by being pivotally connected to the other shoe near its anchored end, it is highly desirable that this pivotal connection should he between the ends of the other shoe, so that thus each of the shoes is anchored between the ends of the other. in the arrangement shown in the drawings, there is a third shoe arranged to a ply the anchored shoe.

Another ieature of the invention relates to thcuse oil a spring acting on one of two con nected shoes in such a manner as to hold the other one of the shoes awayironi the drain, preierahiy in an idle position. determined by a. novel stop, until the spring is overcome by movement of the first shoe with the drum This insures successive action oithe shoes, giving; smooth and gradual application'of the brake.

The above and other objects and features of the invention, including a novel shoe con-- struction embodying spaced flanges between the sides of the shoe and straddling part of an adjacent shoe, and other novel combinations of parts and desirable particular eonstructions, will be apparent from the following description of one illustrative emhod1- merit shown in the accompanying drawing, in which: I

Fig, 1 is a verticsl section through the brake, list inside the head of the drum, and showing the shoes in side elevation;

Fig. 2 is a section through the central shoe, on the line 22 of Fig. l;

Fig. 0 is a section through one end shoe, on the line 3-3 of Fig. 1; and V Fig, 4 is a section on the line it-dot Fig. 1, showing the anchoring ot the shoes.

The brake selected for illustration includes t drum it), the open side of which is closed by a hacking plate 12,

iiithin drum iii-is arranged a shoe i i, piv

oted at its lower end, so that it is most efiec tive when the drum is turning clockwise,

which would be when the vehicle is moving backward. The pivoted end of this shoe curves inwardly of the drum, so that the pivot 16, which takes the tor us from the shoe, thus having the function 0 an anchor, is a considerable distance radially inward from the braking flange of drum it], well within the curve of the'hralre shoes. This gives a considerable Wedging efiect due to the drum friction, when the drum is turning clockwise, so that the shoe so mounted has a very power ful retarding efiect. Such powerful ection in a single shoe would not ordinarily be desirableiin a shoe retarding forward movement of the vehicle, as at the high speeds of such forward movement it would give too harsh s retarding effect, At the relatively low speeds of rearward movement, however, this mounting is erinissihie, and gives a greatly in creased bra ring action in reverse.

, Shoe i i has a pair of oppositely-extending flanges 18 entirely around the edge of its central stifiening flange, parts of which form the cyiindrically-eurved friction face 26, and is thus generally t -shaped in cross-section, as appears in Adjacent the lower end of shoe is is a cen tral shoe 22, having a pair of spaced-apart stiil'ening flanges 2t spaced inwardly between its edges, to straddle part of the end of shoe 14. 'ii'langes 24: are spaced apart just enough to clear flanges 18, so that they position the shoes laterally with respect to each other. once 22 1s p voted on-an anchor 26 passing through a relatively large opening in the straddled part of shoe 14: (Fig. 42-). is to he noted that the anchor oi shoe 22 is between "the ends of shoe i l and that the pivot or anchor of shoe it is between the ends of shoe 22, thus securing the greatest possible use of the drum surface, the friction parts of the two shoes coming immediately adjacent each other The torque-taking means 16 of since 14 is in. the form of a pivot connecting shoe 14. to flanges 24: of shoe 22, the anchor or pivot being shown held. in place by an enlarged head siidably engaging plate 12,

At the unanchored end of shoe 22 is arranged a third shoe 28 having edge flanges till 30 positioned by flanges 24, and copnected to the end of shoe 22 by a pivot 32, which pivot serves as the anchor for shoe 28.

Shoes 14 and 28 are forced apart against the resistance or a return spring 34, to apply the brake, by means such asa. double cam 36. An auxiliary spring 38 insures that shoe 28 will first engage the drum, and will then turn with the drum to overcome sprin 38 and force shoe 22against the drum. pring 38 is connected at one end to plate 12 and at 1 the other end to shoe 28 near its pivoted end,

and thus acts through pivot 32 to hold shoe 22 away from the drum with one flange 24 against an adjustable eccentric stop 40 carried by the backing plate while shoe 28 1s being swung against the drum by cam 36 or the like. This insures successive operation. of the shoes, giving a smooth and gradual operation of the brake. The arrangement of this spring was disclosed in my prior application No. 23,763, filed April 17, 1925, and claims to this feature are to be regarded as divided from that application. At the same time the movement of shoe 14 urges the pivot or anchor 16 toward the drum.

When used in an automobile, Fig, 1 would be a vertical section through one left brake,

- just inside the wheel and looking toward the car, with the front of the car at the left, thus bringing pivots 16 and 26 at the rear of the brake.

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 or the appended claims.

I claim:

l. A brake comprising a pair oi? arouate friction devices, in combination with torquetaking means for, one of said devices a sub stantial distance radially within the curve or said devices, and torque-taking means for the adjacent end oi the other device between the ends of the first device, one or" said means be ing a pivot connecting the two devices.

2. A brake comprising a pair of arcuate friction devices, one including a single shoe and the other including connected shoes, in combination with torque-taking means for said single shoe a substantial distance radially within the curve of said devices, and torquetaking means for the adjacent end of one of the connected shoes between the ends of the single shoe, one of said means being a conthe other having a flan e extending between and straddled by the pair of flanges, together with torque-taking means pivotally connecting the shoes and engaged by the end of said straddled flange, and torque-taking means msaeve engaged by the pair of flanges between the ends of said other shoe.

4. A brake comprising, in combination, a pair of curved shoes, the first havin a pair of flanges spaced apart from pach 0t er and the other havin a flange extending between and straddled by the pair of flan es and thence offset well within the curve of t e shoes and there pivoted to said flanges, and torquetaking means engaged by the pair of flanges between the ends of said other shoe.

5. A brake comprising, in combination, a pair of shoes, the first having a pair of flanges spaced apart from each other and both spaced inwardly from the side edges of the shoe and the other having a flange extending between and straddled by the, pair of flanges, together with torque-taking means engaged by the ends of said pair of flanges, and means pivotally connecting the pair of flanges to the straddled flange between them.

6. A brake comprising, in combination, a pair of shoes, the first having throughout its length a pair of flanges spaced apart from each other and both spaced inwardly from the side edges of the shoe and the other having a flange extending between and straddled by the pair of flanges, together with torquetalzing means engaged by the end of said straddled flange, and torque-taking means engaged b the ends of the pair of flanges, and a third snoe pivotally connected to and arranged to operate one of said pair of shoes.

7. A brake comprising, in combination, a

\ pair of shoes, the first having a pair of spaced flanges spaced inwardly from the side edges of the shoe, and the other having a flange between and straddled by the spaced flanges, together with means connecting the shoes and ta" ing the torque of each shoe between the ends of the other shoe, said means acting on the ends of the shoes at which the flange is straddled by the pair of flanges.

8. A brake comprising, in combination, a

pair of shoes, the first having a air of spaced I flanges spaced inwardly from t aside edges of the shoe, and the other having a flange between and straddled by the spaced flanges,

together with means for pivoting the pair of flanges to the straddled part of said flange, and an anchor for taking the torque of both shoes by engagement with one of the shoes.

Q. A brake comprising, in combination, a

drum, a pair of shoes, one of which. is anchored at one end, a pivot directly connecting the other end of the anchored shoe to the adjacent and of the unanchored shoe, a spring connected to the unanohored shoe and acting through the pivot to hold the anchored shoe away from the drum until overcome by with the drum, a third shoe,-and a second spring tensioned between the unanchored shoe and the third shoe. I

it A brake comprising, in combination, a

movement of the unanehored shoe angularly drum, a pair of shoes, one of which is anchored at one end, a pivot directly connecting the other end of the anchored shoe to the adjacent end of the unanchored shoe, a spring connected to the unanchored shoe and acting through the pivot to hold the anchored shoe away from the drum until overcome by movement of the unanchored shoe angularly with the drum, a third shoe pivoted at the end adjacent the anchored end of the first anchored shoe, and means for forcing the third shoe and the unanchored shoe in opposite directions against the drum.

11. A brake comprising, in combination, a drum, a pair of shoes engageable with the drum, a connection between the shoes, and a spring connected to one of the shoes and acting through the connection and forming the sole means urging the other of the shoes away from the drum.

12. A brake comprising, in combination, a drum, a pair of shoes engageable with the drum, a connection between the shoes, an anchor for one of the shoes, and a spring connected to the unanchored shoe and acting through the connection and forming the sole means urging the anchored shoe away from the drum.

13. Brake mechanism for a vehicle having a road wheel provided with a brake drum comprising, in combination therewith, at least three articulated arcuate brake shoes within the drum, two of which shoes are adapted to wrap with the drum to retard its rotation in the forward travel of the vehicle and the third shoe is adapted to retard its rotation in the opposite direction, said third shoe provided with torque taking means located radially substantially within the curve of the shoes.

14.. Brake mechanism for a vehicle having a road wheel provided with a brake drum comprising, in combination, a pair of retarding devices located within the drum to be urged thereagainst, one retarding device adapted to Wrap with the drum in one direction of rotation to retard its travel and the other retarding device adapted to wrap with the drum in the opposite direction of rotation to retard its travel, said retarding devices provided with torque taking means at adjacent ends, one of which is a pivotal connection betweenthetwo devices, and one of which is positioned substantially radially nearer the axis of the drum than the other.

15. Brake mechanism for a vehicle having a road wheel provided with a brake drum comprising, in combination therewith, a pair of arcuate retarding devices of unequal length arranged within the drum to be urged thereagainst, the retarding device of greater length adapted to wrap with the drum in the forward direction of travel of the vehicle and the device of less length adapted to wrap therewith in the opposite direction of rotation of the drum, said devices provided with torque taking means at their adjacent ends,

the torque taking means of the device of less length being positioned substantially inwardly radially of the torque taking means of the device of greater length, one of said torque taking means comprising a pivotal connection between the two devices.

16. A brake comprising, in combination, a drum, a pair of brake shoes arranged therein with overlapping ends engaging radially and circumferentially separated torque taking members, one of which is a fixed anchor and the other a pivot connecting the two shoes, said anchor being located substantially nearer the periphery of the drum than the pivot.

In testimony whereof, I have hereunto signed my name.

ADIEL Y. DODGE.

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