Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1981-02-23
1983-07-19
Ward, Jr., Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 85, 277 95, 277189, 3081871, 188 18R, 248632, 248634, F16J 1532, F16J 1534
Patent
active
RE0313149
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The invention relates to a seal and a seal assembly in which the seal is positioned at a location sufficient for sealing an annular opening between first and second members rotatable one relative to the other. More particularly, the invention relates to a seal having first and second legs each having a sealing surface in contact with a respective one of a face and an outer surface of the second member.
2. Background Art
In the use of first and second members rotatable one relative to the other, it is desirable to seal an annular opening between the members to prevent passage of foreign matter through said annular opening. According to the present invention, a seal is used to block passage of foreign matter between the first and second member.
U.S. Pat. No. 3,998,297 which issued on Dec. 21, 1976, to Aono shows a brake assembly having a backing plate and cover plate connected thereto which form a labyrinth barrier to material passing between the backing plate and an associated brake drum. U.S. Pat. Nos. 3,533,491 and 3,463,273 which issued to Svenson & Morrison on Oct. 13, 1970, and Aug. 26, 1969, respectively, show similar embodiments of barriers on brake assemblies.
U.S. Pat. No. 4,043,620 which issued to Otto on Aug. 23, 1977, shows embodiments of seals used to seal an annular opening between a shaft and bearing supported housing. U.S. Pat. No. 3,687,464 which issued on Aug. 29, 1972, to Jackson et al shows an embodiment of a seal used to seal between surfaces of a shaft and related perpendicular abutment.
For example, in a lift truck, a brake assembly generally has a backing plate connected to an axle housing. A wheel of the lift truck mounts to a hub which is rotatably connected to an axle tube. The hub includes a brake drum portion. Brake shoes controllably ride against the brake drum portion to slow or stop rotation of the wheel relative to the axle tube. The backing plate is provided to prevent foreign matter from entering the drum which can interfere with the operation of brake shoes against the rotating hub. However, because of relative rotation between the backing plate and hub, an "annular opening" is necessarily maintained between said hub and backing plate. During operation of the vehicle, dirt, rock, or water for example, can enter through the annular opening and interfere with brake operation.
Heretofore, metal plates have been connected to one of the backing plate and hub and angularly extended over the other of said members to form a baffle or labyrinth against entry of the foreign matter. This type of solution, however, does not create a positive seal between the two surfaces and dirt and water can still enter the brake assembly, especially in the harsh environment of a work vehicle such as a lift truck.
Therefore, it is desirable to provide a seal and seal assembly which provides a positive seal between the surfaces of two members rotatable one relative to the other, such as the backing plate and hub, to substantially block entry of foreign matter therebetween.
DISCLOSURE OF INVENTION
In one aspect of the present invention, a seal has a body and first and second legs. The first leg has a sealing surface and is connected to the body and extends outwardly from a first side of the body. The second leg has a sealing surface and is connected to the body and extends outwardly from the first side of the body. The sealing surfaces are oriented generally perpendicular one relative to the other.
In another aspect of the present invention, a seal assembly has first and second members and a body and first and second legs. The second member has an outer surface and a face extending from said outer surface. The first and second members are rotatable one relative to another. The first leg has a sealing surface in sealing, slideable contact with the face of the second member. The second leg has a sealing surface in sealing, slidable contact with the second member radially at the outer surface of said second member. Means is provided for sealably connecting said body to
REFERENCES:
patent: 2092919 (1937-09-01), Johnson
patent: 2198944 (1940-04-01), Mikkelson
patent: 3006701 (1961-10-01), Curtis
patent: 3218692 (1965-11-01), Kayser
patent: 3438639 (1969-04-01), Paulsen
patent: 3447848 (1969-06-01), Pitner
patent: 3533491 (1970-10-01), Svenson
patent: 3614113 (1971-10-01), Burk
patent: 3614183 (1971-10-01), Berens et al.
patent: 3841723 (1974-10-01), Kelso
patent: 3998297 (1976-12-01), Aono
patent: 4021085 (1977-05-01), Willyard
patent: 4058322 (1977-11-01), Fass
Heming William B.
Towmotor Corporation
Ward, Jr. Robert S.
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