Patent ID: 6163650
Filing Date: 2000-12-19
Classification: G03B

Abstract:
A camera comprising a thumbwheel that is manually rotatable in a film winding direction about an axis and that has a continuous alternating series of teeth and spaces concentric about said axis, and an anti-backup device having a tooth that can be received in any one of said spaces to bottom out in the space in order to prevent reverse rotation of said thumbwheel in a film unwinding direction, is characterized in that:said thumbwheel has a plurality of radial spokes that are deformable to change shape through stress in order to permit said thumbwheel to be tilted from being perpendicular to said axis to be inclined to the axis in order to only partially retract any one of said spaces that has received said tooth from the tooth, when one manually rotates said thumbwheel in the film winding direction, whereby as long as said thumbwheel is tilted said tooth cannot bottom out in any one of said spaces that has received the tooth.