Modular hand mixer
US4349758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1980 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Jan 11, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H1/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A modulator motor and drive unit for use in an electrical device, such as a hand food mixer, wherein the motor is characterized by a low-cost speed control which is capable of providing a large number of discrete motor speeds. The speed control, rather than utilizing a multi-contact switch connected to the field coil by individual taps, has approximately twenty field coil continuous loop taps wound over a bobbin spindle in side-by-side relationship with a wiper contact being slideably movable relative thereto along a path from which the insulation has been removed. Positions of the wiper contact may be determined by replaceable detent elements provided with different detent patterns providing different series of motor speeds whereby the same motor and drive module may be provided within a suitable housing(s) for the economical production of several different models of such electrical devices having differing speed selections. The housing halves are provided with module supporting means and may be permanently secured together by adhesive means. The motor is also characterized by a torsion spring and brush guide arrangement which prevents any contact of the brush springs with the mot…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.