Cutlery – Cutting tools – Adjustable blade
Patent
1975-03-17
1976-07-06
Smith, Al Lawrence
Cutlery
Cutting tools
Adjustable blade
30338, 128305, 33164B, B26B 108, B26B 500
Patent
active
039673774
ABSTRACT:
Rotary motion is converted to linear motion by multiple thread sets which cooperate to provide precise control of the amount of rotary motion thus converted. As applied to a precision positioning device for a tool, blade or other object, the thread sets are preferably arranged in a serial and/or telescoped configuration. A relatively simple precision hand tool positioning device is realized by having one thread set arranged in a common direction but reduced pitch relative to the other set. The finiteness of the object positioning is further enhanced by moving it with respect to an inclined plane. A retaining device for gripping the element to be moved is directly associated with a shank having the smaller pitched thread set thereon. The shank is prevented from rotating but allowed to move linearly relative to a housing and the threads thereof engage a spindle which has another set of threads for engaging the housing. A calibrated indicator of the shank position in easily readable format is provided. A split collet for the shank with a spring biased collet clamp and actuator is particularly well-suited for use as a tool chuck especially useful for calibrated craftsman knives. A detent arrangement can be included with the housing.
REFERENCES:
patent: 272944 (1883-02-01), Case
patent: 2125005 (1938-07-01), Jearum
patent: 2968489 (1961-01-01), Doniger
patent: 3247592 (1966-04-01), Arden
Peters J. C.
Smith Al Lawrence
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