Handwheel-operated device

a technology of handwheel and chuck, which is applied in the direction of portable power-driven tools, applications, kitchen equipment, etc., can solve the problems of limited speed and/or torque that can be developed at the chuck, devices are therefore unsuitable for long-term use, and users who lack physical strength, and achieve the effect of accurate response of the speed of rotation

Inactive Publication Date: 2006-11-02
CAMBRIDGE CONSULTANTS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] The effect of the variable low-pass signal filter is to cause the first control means to react relatively quickly to changes of angular displacement and/or angular velocity of the handwheel at low speeds of rotation of the handwheel, and relatively slowly to changes of angular displacement and/or angular velocity at higher speeds of rotation of the handwheel. This has been found to be necessary to give an accurate response of the speed of rotation of the chuck to changes of the speed of rotation of the handwheel at low speeds of rotation of the handwheel, which gives a user of the device the same impression of control of the speed of rotation of the chuck as is obtained with a conventional mechanical device, but avoids an overly abrupt response of the speed of rotation of the chuck to changes of the speed of rotation of the handwheel at high speeds of rotation of the handwheel. Such an abrupt response of the speed of rotation of the chuck to changes of the speed of rotation of the handwheel is gen

Problems solved by technology

However, the magnitude of the speed and/or torque that can be developed at the chuck is limited by the magnitude of the speed and/or torque applied to the handwheel, which must be

Method used

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Examples

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Embodiment Construction

[0079] The cordless drill 10 of FIG. 1 comprises a body 12, a handwheel 14 and a chuck 16. Except for the handwheel, the drill 10 superficially resembles a conventional drill, with a pistol grip 18, trigger switch 20 located in the pistol grip, and forward housing portion 22 located in front of the trigger. The handwheel 14 is attached to the portion 22. A rechargeable battery 24 is removably attached to the base of the body.

[0080] Turning to FIG. 2, from which the battery 24 has been omitted for the purpose of clarity, the body 12 contains a first motor 26, a first rotary encoder 28, a gearbox 30, a second motor 32, a second rotary encoder (not shown), and first and second gear wheels 34 and 36, respectively. The body 12 further contains first control means in the form of a programmed microprocessor (not shown). The first rotary encoder 28 is made up of a multipole magnet and three Hall effect detectors and is attached to a first end of the spindle of the first motor 26. The gearb...

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Abstract

A handwheel-operated device comprising a body, a handwheel and a chuck, the handwheel and the chuck being rotatable relative to the body, and the device further comprising a first motor operable to rotate the chuck, first sensor means responsive to rotation of the handwheel and first control means operable in conjunction with the first sensor means to cause the first motor to rotate the chuck in dependence upon an angular displacement and/or angular velocity of the handwheel.

Description

FIELD OF THE INVENTION [0001] This invention relates to a handwheel-operated device and to a method of controlling a motor of a handwheel-operated device by sensing rotation of the handwheel and causing the motor to rotate a chuck in dependence upon the rotation of the handwheel. BACKGROUND TO THE INVENTION [0002] Mechanical devices of the kind having a handwheel connected to a chuck through a gear train, so that rotation of the handwheel causes a corresponding rotation of the chuck are well known. Hand drills and hand whisks are examples of such devices. These handwheel-operated devices are popular because a handwheel affords a high degree of control over the speed of rotation of the chuck. However, the magnitude of the speed and / or torque that can be developed at the chuck is limited by the magnitude of the speed and / or torque applied to the handwheel, which must be provided by the user. Such devices are therefore unsuitable for use over long periods or by users who lack physical ...

Claims

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Application Information

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IPC IPC(8): E21B17/22A47J43/10B23B45/02B25F5/00
CPCA47J43/1037B25F5/00B23B2260/128B23B45/02
Inventor WEBSTER, CRAIG DUNCAN
Owner CAMBRIDGE CONSULTANTS LTD
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