Retrofittable chair lifting and tilting device
AssigneeHand Machine Company, Inc.
InventorsArnold H. Rudes, Robert F. Hand
Life of this patent
Estimating the term…
Abstract
A power lifting and tilting device is more universally adaptable for economic retrofitting to most types of chairs as assists for the infirm. Little or no floor clearance requirements are achieved with power driven rollers traveling oppositely inclined surfaces of the device to produce lifting and tilting action for alighting from and occupying the chair.
Claims19
A retrofittable chair lifting and tilting device which comprises lower main frame means for resting on a support surface;
- upper supporting platform means for engaging with a chair, said lower main frame means and upper supporting platform means having front and rear sections corresponding respectively to the front and rear of said chair;
- right and left linking arm means pivotally connected to the rear section of said lower main frame means and to the front section of said upper supporting platform means for forwardly tilting said upper supporting platform means as it is elevated relative to said lower main frame means;
- a plurality of cam means having oppositely inclined surfaces positioned between said upper supporting platform means and lower main frame means;
- roller means for engaging said inclined surface, and motor means for advancing said roller means and wedging apart said cam means to actuate said upper supporting platform.
A lifting and tilting device retrofittable to a chair without requiring structural alterations to said chair, which comprises a lower main frame for resting on a supporting surface;
- an upper chair platform for engaging with the bottom of a chair, said lower main frame and upper chair platform having front and rear sections corresponding respectively to the front and rear of said chair;
- right and left irregular parallelogram linkage arms pivotally connected to the rear section of said lower main frame and front section of said upper chair platform for forwardly tilting said upper chair platform as it is elevated relative to said lower main frame;
- pairs of first and second cam elements having oppositely inclined surfaces laterally offset from one another, said first cam elements being spaced relative to one another and mounted in dependency relationship to said linkage arms, said second cam elements being spaced relative to one another and mounted upwardly to said lower main frame;
- rollers rotatably mounted on a cross shaft and spaced so each engages the inclined surface on said cam elements, and a motor and drive shaft for advancing said cross shaft and rollers for wedging apart the cam elements for actuating the upper chair platform.
A retrofittable chair lifting and tilting device which comprises lower main frame means for resting on a support surface;
- upper supporting platform means for engaging with a chair, said lower main frame means and upper supporting platform means having front and rear sections corresponding respectively to the front and rear of said chair;
- right and left linking arm means pivotally connected to said lower main frame means and upper supporting platform means for forwardly tilting said upper supporting platform means as it is elevated relative to said lower main frame means;
- a plurality of cam pairs, each of said cam pairs comprising an upper cam and a lower cam, said upper and lower cams each having an inclined surface positioned opposite to the other between said upper supporting platform means and lower main frame means;
- roller means for engaging said inclined surfaces, and motor means for advancing said roller means and wedging apart each of said cam pairs to actuate said upper supporting platform.
Dependencies are inferred from the claim text.