US Patent: 6,109,141
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| Biasing Structure for Ratchet Wrench Pawl
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Patentee:
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| William A. Nurmi (exact or similar names) - Racine, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 12, 1999 |
| Granted: |
Aug. 29, 2000 |
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Stan Schulz
Snap-On Tools Company History
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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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