Planetary gear transmission systems or components – Condition responsive control
Reexamination Certificate
1999-10-13
2001-03-06
Marmor, Charles A (Department: 3681)
Planetary gear transmission systems or components
Condition responsive control
C475S257000
Reexamination Certificate
active
06196943
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to electric tool knob control apparatus, and more specifically to a knob which may rotate forward or backward to regulate drive shaft torque of electric tool; also, torque can be homed to initial status by rotating knob around 360° in same direction.
BACKGROUND OF THE INVENTION
It's well known that in regulable drive shaft torque electric tool a knob is set on the outside of drive shaft. By engaging with the machine components inside the tool, knob may regulate drive shaft torque. Moreover, a torque scale is set on electric tool to regulate the need output torque with knob in which a pointer is installed. The pointer and the torque scale may read out drive shaft torque.
In early time, electric tool knob cannot rotate around 360° in same direction. The rotating is along low torque level to high torque level. When knob is in the highest torque level, knob should be rotated in opposite direction for going to low torque level. Therefore, it's need to move along a long distance and inconvenient for use. The present invention is to provide a switch device for solving the said drawback.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an electric tool knob control apparatus, which may regulate the output torque of drive shaft and home to initial status either forward or backward direction around 360°. To switch between high torque and low torque is faster than before.
Therefore, the present invention is to provide an electric tool knob control apparatus in which a compressing spring and a cam controller are set consequently on the sleeve of drive shaft base. Compressing spring locates between cam controller and base. On sleeve, an external gear wheel is set. Cam controller includes a spur cam-disk and a passive cam-disk. On spur cam-disk and passive cam-disk, cam-disk flange and cam-disk recess are circular arranged and relatively set; therefore, cam-disk flange and cam-disk recess may engage to each other. On spur cam-disk, a plurality of planet gearwheel is set pivotally. By covering the outside of cam controller and sleeve with a knob with inward gear set inside diameter, planet gear wheel may engage with inward gear and external gear wheel in the same time. Also, passive cam-disk, which engages with knob, may rotate with knob and move in axial direction of knob. Passive cam-disk and spur cam-disk may be driven to rotate while knob is moved to rotate. Therefore, passive cam-disk moves along axial direction to relax and compress the compressing spring for regulating drive shaft torque. By the rotational speed difference, knob may regulate torque and be homed in 360°.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4861201 (1989-08-01), Cuileron
patent: 4892013 (1990-01-01), Satoh
patent: 4898249 (1990-02-01), Ohmori
patent: 5277527 (1994-01-01), Yokota et al.
patent: 5437524 (1995-08-01), Huang
patent: 5711739 (1998-01-01), Hashimoto et al.
patent: 3-815883 (1988-05-01), None
patent: 7-293583 (1994-04-01), None
patent: 8-124460 (1994-10-01), None
Bacon & Thomas PLLC
Marmor Charles A
Trinity Metallize Co., Ltd.
Waddell Tisha D.
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