Motor-driven massager with variable speed control

Details Motor-driven massager with variable speed control Motor-driven massager with variable speed control

1991-09-23

1993-11-30

Hafer, Robert A.

Surgery

Truss

Perineal

128 32, 128 44, 128 52, A61H 100

Patent

active

052655903

ABSTRACT:
A motor operated massager has a DC motor and an applicator driven thereby at a variable operation speed to apply a massaging action to a user's body during which the motor suffers a varying load in consequence of that the applicator means is pressed at a varying force against the user's body. A control is made to keep the operation speed at a selected level in accordance with a varying load requirement until the load reaches a tolerable load limit which is determined in correspondence to the selected operation speed. When the load increases beyond the tolerable limit, the motor is controlled differently to decrease the operation speed to such an extent as to follow the load increase until the load reaches a predetermined maximum load limit. Upon reaching the maximum load limit, the motor is stalled while limiting a motor current to a fixed level.

REFERENCES:
patent: 3696278 (1972-10-01), Kuniyoshi et al.
patent: 3697839 (1972-10-01), Unnewehr
patent: 4422448 (1983-12-01), Sugai et al.
patent: 4422449 (1983-12-01), Hamabe
patent: 4770065 (1988-09-01), Woyton
patent: 5022384 (1991-06-01), Freels et al.

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