Crank case drain plug structure and method

Details Crank case drain plug structure and method Crank case drain plug structure and method

1995-01-23

1996-08-20

Denion, Thomas E.

Lubrication

Automobile crank and gear case service

138 89, 184109, F16C 314

Patent

active

055470424

ABSTRACT:
Improved drain plug structure and method for the oil pan of the crank case of an automobile engine of the like, which permits removal of the drain plug for draining oil from the oil pan without leaking of oil on tools or personnel. In accordance with the invention, a resilient sealing member is provided operably positioned in relation to the stem of the drain plug and the opening through the oil pan to prevent undesired leakage between the drain plug and oil pan during removal of the drain plug. In a preferred embodiment, the sealing member is a cylindrical, resilient disc of sealing material secured to the end of the stem of the drain plug. In a modification, the diameter of the sealing member is adjusted by placing a disc over the sealing member and compressing the sealing member between the disc and end of the stem of the drain plug. In further modifications, the sealing member is am annular band of O-ring in a groove around the inner end of the stem of the drain plug or may be a band or O-ring in the opening through the oil pan adjacent to the bottom thereof. In accordance with the method of the invention, a drain plug is provided with a sealing member on the inner end thereof operably positioned in relation to an oil pan and the drain plug during removal of the drain plug from the oil pan to seal between the oil pan and the drain plug. In modifications of the method, the sealing member is compressed to vary the diameter of the sealing member and/or is positioned in an annular groove about the end of the stem of the drain plug of in the opening in the oil pan which receives the drain plug.

REFERENCES:
patent: 3967697 (1976-07-01), Guenther
patent: 4503934 (1985-03-01), Stephanus et al.
patent: 4938314 (1990-07-01), Sitzler et al.
patent: 4951723 (1990-08-01), Hoeptner, III

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