Machine element or mechanism – Mechanical movements – Rotary to reciprocating and rotary
Reexamination Certificate
1998-10-29
2001-03-06
Herrmann, Allan D. (Department: 3682)
Machine element or mechanism
Mechanical movements
Rotary to reciprocating and rotary
C173S047000, C475S175000
Reexamination Certificate
active
06196076
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to an electrical rotatively-driven hand tool and in particular to a knob switch device adapted in the hand tool, especially a knob that is capable of 360° rotation to switch between the simplex rotation and the rotation with vibration.
BACKGROUND OF THE INVENTION
Conventionally, electrical tools that drive a screwdriver or a drill bit can only rotates. For the reason that the screw driver or the drill bit may get stuck in the material of the work pieces the electrical tool is made to be switchable between simple rotation and rotation with vibration which allows the tool to work more effective and efficiently by combining rotation and axial vibration.
The prior art electrical tool capable of rotating with vibration comprises an impress ring of a steel ball, a spring, and a stop ring sequentially fit over a canister. The spring is seated between the stop ring and the impress ring of the steel ball. Plural teeth are formed on the top of the canister. Springs, a switch set, a vibration block and a vibration set are sequentially fit over an output shaft. Teeth are formed on both the vibration block and the vibration set and are engageable with each others The stop ring is fixed on the knob. With control juts formed on the back end of the electrical tool pushing the switch set, the teeth of the vibration block and the teeth of the vibration set are controlled to engage or to separate. When the teeth engage each other, the vibration set is fixed and the vibration block rotates with the rotation of the output shaft. This causes the output shaft to rotate with axial vibration. When the teeth of the vibration block and the teeth of the vibration set separate, the output shaft can only rotate without vibration.
The above prior art structure of the electrical tools, which can be switched between simple rotation and rotation with vibration, utilizes the jut eccentrically formed on the stop ring to push the switch set. When the stop ring rotates, the spring set on the jut drives the switch set to move axially. Further, it controls the vibration block and the vibration set to engage each other, which causes the axial vibration. Therefore, when the stop ring rotates, the single jut works in the eccentric position of the switch set and the rotation is only allowed in one direction. The movement of the switch set in the axial direction is unstable and the precision of switching operation is poor. Thus, the present invention intends to improve the prior art design of the electrical tool which is capable of switching between simple rotation and rotation with vibration.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a knob switch device to be adapted in an electrical rotatively-driven hand tool, which is capable of rotating over 360° in order to switch between simply rotating and rotating with vibration.
Another object of the present invention is to provide a knob switch device, which allows the switch set moving axially to push the vibration block in a more stable manner. The knob switch is rotatable in either direction to perform the switching operation. Thus a high precision and convenient switching operation is obtained.
The present invention provides a knob switch device comprising a clutch control device, which is arranged inside an inner casing and a switch device, which is arranged outside the inner casing. The clutch control device comprises a switch block, a switch set, a vibration block and a vibration set which are sequentially fit over an output shaft. Teeth, which are engageable with each other, are formed on the switch block and the switch set. Further teeth, which are engageable with each other, are formed on the vibration block and the vibration set. The switch device comprises a stop ring, a stop board and a gyrator ring. The stop ring is rotatable with respect to the inner casing. The stop board is only allowed to move axially on the inner casing. By means of biasing force caused by a biasing element, arc sections on the stop board are caused to engage arc sections on the stop ring. A clutch member is movably arranged on the stop board. A knob is fit over and fixed to the gyrator ring and the stop ring, which are manually rotated by rotating the knob. The gyrator ring has a circular inner circumference and a recess of a predetermined length along the circumferential direction is formed on the circular inner circumference. A turning ring is set on the switch block and having plural holes which are lined along the turning ring. An inward-toothed ring is set on the gyrator ring comprising plural axially extending cylindrical posts having a radius smaller than the radius of the hole receivable into the holes. The inward-toothed ring has teeth formed on an inner circumference, which has a fixed eccentricity. An outward-toothed ring is in the inward-toothed ring. The amount of the teeth of the outward-toothed ring is less than the amount of the teeth of the outward ring and is engageable with each other. The clutch extends out of the central hole of the gyrator ring and engages one of the teeth of the outward-toothed ring to fix the outward-toothed ring and prevent the outward-toothed ring from rotating so as to form a speed reduction device. By rotating the knob, the stop ring and the gyrator ring are rotated at the same time. It makes the arc sections of the stop ring push the jut of the stop board and the stop board moves axially to drive the inward-toothed ring. When the clutch is moved into the recess of the inner circumference of the gyrator ring and separates from the outward-toothed ring, it will lead in releasing the clutch. And it makes the knob, the inward-toothed ring and the turning ring rotate at the same time. By having the clutch moved out of the recess, the gyrator ring rotates and makes the clutch to be seated in the inner circumference, which fixes the outward-toothed ring again and resumes the speed reduction function, and it drives the switch block to rotate. Then the switch block fits the switch teeth and makes the teeth of the vibration block to fit the teeth of the vibration set and make the output draft to have action of vibration at rotating time. When the knob is rotated forward or backward, the output shaft resumes to rotate without the action of vibration.
REFERENCES:
patent: 628094 (1899-07-01), Hooper
patent: 3835715 (1974-09-01), Howell
patent: 4158313 (1979-06-01), Smith
patent: 4229981 (1980-10-01), Macky
patent: 5451127 (1995-09-01), Chung
Herrmann Allan D.
Ostrolenk Faber Gerb & Soffen, LLP
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