3683898 is referenced by 7 patents and cites 4 patents.

Therapeutic apparatus to aid certain disabled and bedridden persons to participate in physical activities otherwise prevented because of their infirmities. In one embodiment of the invention, the apparatus includes an exercise bar supported above a bed by a block and tackle assembly connected with motor means operative therethrough to reciprocate the bar vertically. The bar is also supported for angular displacements about a generally vertical axis, and a reversible drive motor may be included to impart angular displacements to the bar. The apparatus may be used, for example, in exercising the back, leg, arm, and shoulder muscles of a bedridden person.

Title
Therapeutic apparatus
Application Number
05/083,702
Publication Number
3683898
Application Date
October 26, 1970
Publication Date
August 15, 1972
Inventor
Underwood Timothy J
Assignee
Humphrey Elevator and Truck Company
IPC
A61h 01/02
A61H 01/02
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