Battery operated device

Details Battery operated device Battery operated device

1991-03-25

1992-03-17

Shoop, Jr., William M.

Electricity: motive power systems

Battery-fed motor systems

318109, 388838, H02P 500

Patent

active

050971840

ABSTRACT:
A battery operated device includes a circuit connecting a DC motor (22) and a battery (9) made up of a plurality of cells (10, 11, 12) connected in series with a two-pole switch device (23) including a first switch (24) and a second switch (25). The DC motor (22) receives a lower battery voltage from an intermediate tap (17) of the battery through a first switch (24) and it receives the full battery voltage through an end tap (15) when the second switch (25) is closed so that the motor can be operated at two speeds. Further, elements are provided for preventing a short circuit between the intermediate tap (17) and the end tap (15) of the battery (9) when the second switch (25) is closed. As a result of this switching arrangement, an extensively interrupted-switching is available, so that practically no power lapses occur when switching over from one speed to the other.

REFERENCES:
patent: 635139 (1899-10-01), Kubierschky
patent: 2387262 (1945-10-01), Hubbard
patent: 3336516 (1967-08-01), Kelley
patent: 3984744 (1976-10-01), Moody
patent: 4260938 (1981-04-01), Joyes
patent: 4296363 (1981-10-01), Blake et al.
patent: 4406982 (1983-09-01), McClellan
patent: 4465958 (1984-09-01), Roberts
patent: 4639646 (1987-01-01), Harris et al.
patent: 4788480 (1988-11-01), Field et al.
patent: 4875539 (1989-10-01), Abukawa et al.

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