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US Patent: 6,109,141
Biasing Structure for Ratchet Wrench Pawl
Patentee:
William A. Nurmi (exact or similar names) - Racine, WI

USPTO Classifications:
81/60, 81/63

Tool Categories:
wrenches : ratchet wrenches

Assignees:
Snap-On Tools Co. - Kenosha, WI

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Mar. 12, 1999
Granted: Aug. 29, 2000

Patent Pictures:
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Report data errors or omissions to steward Stan Schulz
Snap-On Tools Company History
Description:
Seyfarth & Shaw - patent attorneys

Abstract

A biasing structure for maintaining a pawl in engagement with a toothed gear of a ratchet wrench is provided. The structure includes an elongated plunger having an axis, a pawl engagement end, a spring insertion portion having a free end, a central portion connecting the engagement end to the spring insertion portion, and an annular first shoulder having a shoulder diameter formed between the spring insertion portion and the central portion. The spring insertion portion is tapered from a maximum diameter at the first shoulder to a minimum diameter at the free end. The structure also includes a compression spring coupled to the plunger assembly and having a plurality of coils, wherein at least one of the coils has a diameter less than the shoulder diameter and is disposed about the central portion. A reversible ratchet wrench having a pawl and using the biasing structure is also provided.

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