US2031690A - Brake shield - Google Patents

Description

Feb. 25, c E U BRAKE SHIELD Filed Nov. 21. 1934 Mai-l III-III II wIIIII" INVENTOR. Clem/155E911 ATTORNEY.

Patented Feb. 25, 1936 BRAKE SHIELD Clarence E. Budd, South Bend, Ind., asslgnor to Bendix Products Corporation, South Bend, Ind., a corporation of Indiana Application November 21, 1934, Serial No. 754,024

2 Claims.

This invention relates to brakes, and is illustrated as embodied in an internal expanding brake having a novel and improved joint between the drum and the backing plate.

5 An object of the invention is to provide simple and inexpensive, but effective, means for sealing the joint between the drum and backing plate, to keep out dirt, water, etc. Preferably the seal is made very efiective by a double seal, or a sort of multiple baflie.

In the preferred arrangement, a sheet met device is formed with a double-thickness inner portion welded or otherwise secured to the peripheral portion of the backing plate, and with di- 15 verging outer portions cooperating respectively with the inner and outer surfaces of the drum.

Preferably the portion which cooperates with the exterior of the drum has a flange encircling the drum adjacent its free edge.

This'novel sheet-metal device may be made by forming or rolling-strip stock to the desired crosssection, in a continuous spiral if it is rolled. If such a spiral is formed, sections are cut therefrom and their ends welded or otherwise secured to- 25 gether to form substantially complete rings. The

device may also be built up by making two stampings and welding or otherwise securing them together at the double-thickness portion.

The above and other objects and features of 30 the invention, including various novel combinations of parts and desirable particular constructions, will be apparent from the following description of the illustrative constructions shown in the accompanying drawing, in which:

Figure 1 is a section through a brake embodying the invention;

Figure 2 is a perspective view of a blank which may be used;

Figures 3 and 4 are sections showing the form- 40 ing of the device from the blank of Figure 2;

Figure 5 is a perspective showing a piece of strip stock suitable for use in making the device by a rolling operation;

Figure 6 shows this stock rolled to the neces- 45 sary cross-section, in a long continuous spiral;

Figure 7 is an elevation showing a ring made from a section of the spiral of Figure 6, with its ends welded together; and

Figure 8 is a partial section through a brake,

50 corresponding to the upper part of Figure 1, but showing the device made by welding together two stampings.

The illustrated brake includes a rotatable drum l0 having a cylindrical braking flange l2, prefer- 66 ably with an external stiffening flange H at its edge. A backing plate It, arranged at the open side of the drum, cooperates with the drum to form a substantially closed brake chamber housing the brake friction means, shown as shoes l8. The present invention has to do with sealing 5 the joint between the drum and the backing plate.

In the method of making the sealing device illustrated in Figures 2, 3 and 4, I provide a ring 20 of sheet metal, either stamped from a flat 1o sheet, or bent edgewise from a steel strip. In the latter case the ends of the bent section of sheet steel are butt-welded or otherwise secured togather to form a continuous flat ring.

This blank is first drawn into the shape shown in Figure 3, with a cylindrical inner flange 22, and a channel-section portion 24 terminating in a peripheral cylindrical flange 26. The flange is next formed radially outward as a plane portion 28. This gives two diverging portions 24 and. 28 integrally connected by a double-thickness portion MB.

The device is next secured to the periphery of the backing plate it, as shown in Figure 1, for example by welding the double-thickness portion 25 to the outer peripheral zone of the backing plate. When the backing plate and the drum are then assembled as in Figure 1, the portion 28 is in close sealing proximity to the interior of the brake drum, being closely encircled by the 30 braking flange l2, while the flange 28 closely encircles the drum flange Hi in cooperative sealing relationship thereto. This gives the desired double baiile efiect, and effectively seals the joint.

As illustrated in Figures 5, 6 and 7, the device may be made from strip steel 32 (Figure 5), by rolling it into a spiral 38 of the cross-section shown in Figure 4, cutting a convolution thereirom and flattening it into a ring 36 (Figure 7) and butt-welding or otherwise securing its ends together in a permanent joint 38.

As illustrated in Figure 8, two ring-shaped blanks similar to the blank 20 may be provided, one being somewhat larger and being stamped or pressed to form the channel 24 and the flange 26, and the inner peripheral zones of the two blanks being welded or otherwise secured together to form a. double-thickness portion 40 corresponding to the portion 30 shown in Figures 1 and 4.

While several illustrative constructions have been described in detail, it is not my intention to limit the scope of the invention to those particular constructions, or otherwise than by the terms of the appended claims.

I claim:

LAbrake baekineplatcadaptedtobearrangedatandtocloeetheopensideoiahrake drum.andhnvingaecuredatitsperiphery a sheet metal member doubled on itself and having one edge in close proximity to the internal surface oi the drum and having a portion adjacent its other edge projecting over the exterior o! the drum prising a double-thickness inner portion formed to be secured to the backing plate and two diverging outer annular portions, one adapted to come into close proximity to the interior of a brake drum and the other having a peripheral flange adapted to encircle the periphery of the drum at its edge, said device comprising a sheet-metal Dart folded on itself to form said double-thickness portion.

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