Tools – Wrench – screwdriver – or driver therefor – Responsive to movement of work
Patent
1990-04-11
1991-09-03
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Responsive to movement of work
81 583, 81 57, B25B 2300
Patent
active
050442333
ABSTRACT:
A depth adjuster for a rotary tool such as a screwdriver having a tool bit projecting through a nose provided at the front end of the rotary tool. The depth adjustor comprises a locator sleeve mounted on the nose to project on the front end of the tool in such a manner as to surround the tool bit. The locator sleeve has an internal thread engaged with an external thread on the nose so as to be axially movable relative to the nose and the tool bit as the sleeve rotates about the nose. A lock ring is fitted on the nose to be rotatively fixed but axially movable relative thereto. The lock ring is biased towards the locator sleeve by a spring for locking engagement into the locator sleeve so as to rotatively fix the locator sleeve around the nose, whereby retaining the locator sleeve at a desired axial position relative to the nose. The engagement between the lock ring and the sleeve is such that, when the locator sleeve is forced to rotate about the nose, the lock ring moves axially rearwardly against the spring bias to disengage the locator sleeve from the lock ring, thereby permitting the locator sleeve to rotate freely from the lock ring for adjustment of an axial position of the sleeve relative to the nose. The spring is supported between the lock ring and a rear end of the locator sleeve so that the spring is received and concealed within the locator sleeve together with the lock ring.
REFERENCES:
patent: 1744976 (1930-01-01), Levedahl
patent: 3460408 (1969-08-01), Raymond
patent: 3712352 (1973-01-01), Lafferty, Sr.
patent: 4809572 (1989-03-01), Sasaki
Hongo Syoichi
Tatsu Kunihiko
Torigoe Masao
Yamamoto Masao
Cruz Lawrence
Matsushita Electric & Works Ltd.
Schmidt Frederick R.
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