Constant belt tension assembly for wheelchairs

Details Constant belt tension assembly for wheelchairs Constant belt tension assembly for wheelchairs

1981-12-02

1984-01-10

Peters, Jr., Joseph F.

Motor vehicles

Power

Electric

180DIG3, 192 11, 474137, F16H 710, B60K 1704

Patent

active

044248733

ABSTRACT:
A wheelchair having left and right drive wheels (18, 26) each connected with a wheel pulley (16). Left and right electric drive motors (10) are connected with drive pulleys (12, 20). V-belts (14) extending between the drive and wheel pulleys. Left and right belt-pulley engagement improvement assemblies (40, 60) urge the belts further around the circumference of the drive pulleys to improve frictional engagement and reduce slippage. Each engagement improving assembly includes a first roller (84) and a second roller (94) disposed adjacent an associated drive pulley (20) for selectively urging a first portion (52) and a second portion (54) of the belt together. As the belt portions move toward each other, the belt wraps further around the drive pulley increasing the frictional engagement area reducing the amount of tension required for non-slipping engagement between the belt and the pulley. The first roller (84) is disposed on a first slide assembly (62) and the second roller is disposed on a second slide assembly (64). The first slide assembly slides freely on a guide rod (60) and the second slide assembly is limited in its movement by a tension limiting spring (72). A pivot (102) and cam (104, 108) assembly selectively move the guide rod and first slide assembly relative to each other to move the first and second rollers into and out of engagement with the belt.

REFERENCES:
patent: 1582516 (1926-04-01), Gibson
patent: 3064744 (1962-11-01), Jennings
patent: 3575058 (1971-04-01), Kraus
patent: 3598194 (1971-08-01), Wappler et al.
patent: 3834477 (1974-09-01), Sandow
patent: 4012963 (1977-03-01), Ehters et al.

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