Quick release for helically-threaded drive unit

Details Quick release for helically-threaded drive unit Quick release for helically-threaded drive unit

1980-03-19

1982-03-30

Marmor, Charles A.

Dispensing

With discharge assistant

Insertable cartridge or removable container

222333, 222390, 744248A, B67D 546

Patent

active

043220223

ABSTRACT:
The drive train of the threadably advanced piston for a power caulker is provided with a quick release feature. When this feature is activated, the active portions of the drive nut of a lead screw in the drive train are disconnected from the lead screw so that internal pressure in the supply chamber of the cartridge may quickly equilibrate itself by pushing the piston and its lead screw backwards. Thus, dispensing may be smartly stopped and sharply curtailed, merely by releasing the trigger on the power hand tool and activating the quick release. Either of these acts may be performed first or both may be performed simultaneously. By preference, the quick release feature includes threaded claws that are cammed into and out of driving relation with the lead screw by a simple twist of the drive nut.

REFERENCES:
patent: 1393001 (1921-10-01), Wood
patent: 2393764 (1946-01-01), Frank
patent: 3997084 (1976-12-01), Davis, Jr.
patent: 4080844 (1978-03-01), Killian
patent: 4171072 (1979-10-01), Davis, Jr.

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