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US 5,277,527 AGranted
Torque adjustment device
AssigneeRyobi Ltd.
InventorsTakao Yokota, Yasuo Wada
Life of this patent
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AssigneeRyobi Ltd.
InventorsTakao Yokota, Yasuo Wada
Estimating the term…
A torque adjustment device is disclosed which enhances durability and in which it is easy to set a maximum torque and to perform fine adjustment while normally keeping constant a rotational force of a torque adjustment sleeve. A cylindrical clutch adjustment handle is rotatably mounted at an opening portion of a housing. A clutch case is received within the clutch adjustment handle. A plurality of slant surfaces which are different in height in the axial direction are formed in an inner circumferential portion of the clutch adjustment handle. A clutch plate is supported to the slant surfaces. Also, the clutch plate is displaceably mounted along an outer peripheral portion of the clutch case. Steel balls which are held by a clutch surface of an inwardly toothed gear are received in holes of the clutch case. A spring is interposed between an abutment plate in abutment with the steel balls and the clutch plate. A plurality of recesses are formed in a flanged portion of the clutch adjustment handle. A projection of a positioning plate is engaged with the associated recess.
A torque adjustment device for adjusting the operation of a clutch mechanism for transmitting rotational force from a drive source to a spindle, wherein one end of a cylindrical torque adjustment sleeve is rotatably mounted at an opening portion of a housing, a bearing clutch case for supporting the spindle is received in the torque adjustment sleeve, a plurality of slant surfaces which are slanted in the circumferential direction of the torque adjustment sleeve such that the height of each surface changes in the axial direction of the torque adjustment sleeve are formed in an inner circumferential portion of the torque adjustment sleeve, a torque adjustment plate is supported on the slanted surfaces, a resilient member is interposed between the torque adjustment plate and the clutch mechanism, a positioning plate provided at an end face of the bearing clutch case is in abutment with the other end of the torque adjustment sleeve, and a click mechanism is formed between the positioning plate and the other end of the torque adjustment sleeve.
An electric drill having a spindle onto which a working tool is mounted, a drive motor, a switch means for turning on/off the motor, a speed reduction means including planetary gears, a torque adjustment mechanism for adjusting a maximum torque to be transmitted to said spindle and a housing for receiving said speed reduction means,
Dependencies are inferred from the claim text.