A swivel caster is disclosed having a mounting plate, swivel yoke, swivel bearing, a wheel on the yoke, and structure which will locate and cammingly index the yoke and plate in a predetermined relative radial position and cammingly release the index in response to a torque force between the yoke an
A swivel caster is disclosed having a mounting plate, swivel yoke, swivel bearing, a wheel on the yoke, and structure which will locate and cammingly index the yoke and plate in a predetermined relative radial position and cammingly release the index in response to a torque force between the yoke and the plate.
대표청구항▼
An improved swivel caster having a mounting plate, a swivel yoke, a swivel bearing connecting the yoke to the plate, and a wheel mounted on the yoke with the axis of the wheel spaced from the axis of the swivel bearing, the improvement comprising means for automatically indexing and de-indexing the
An improved swivel caster having a mounting plate, a swivel yoke, a swivel bearing connecting the yoke to the plate, and a wheel mounted on the yoke with the axis of the wheel spaced from the axis of the swivel bearing, the improvement comprising means for automatically indexing and de-indexing the yoke with respect to the mounting plate, said automatic indexing and de-indexing means having a. a cam formed of round disc rigidly mounted on the yoke co-axially with and in a plane perpendicular to the axis of the swivel bearing, said cam being co-rotatable with the yoke and having 1. a circular surface concentric to the axis of the swivel bearing 2. a plurality of radial cam ramps extending radially from the circular surface, said radial cam ramps being spaced every ninety degrees from each other about the circular surface, 3. a pair of biasing surfaces in each radial ramp, there being a biasing surface on each side of each ramp, and 4. a central index surface in each ramp and between a respective pair of biasing surfaces, each index surface being in a plane parallel to the axis of the swivel bearing; b. a latch mechanism mounted upon the mounting plate, said latch having 1. a cam follower reciprocably displaceable within the latch, said cam follower having a cam engaging follower surface having a flat face surface lying in a plane parallel to the axis of the swivel bearing, said face surface having a width less than the width of said cam central index surface, and a follower flank surface on each side of The face surface, and 2. means for resiliently biasing the cam follower into engagement against the cam, with a follower flank surface being angularly cammingly engagable with and against a respective cam biasing surface during rotation of the yoke with respect to the mounting plate, said latch being operable for radially biasing the yoke into a position of index upon contact of a follower flank surface against a cam biasing surface, and said cam being operable for displacing the cam follower from a radial ramp to the circular surface upon application of a predetermined torque between the yoke and the plate which torque is sufficient to overcome the pressure of the biasing means through the angular camming engagement between a cam biasing surface and a follower flank surface; and c. an arcuate width between the cam biasing surfaces, which arcuate width is greater than a corresponding width of the follower flank surfaces so that when the yoke is in a position of radial index with respect to the mounting plate, the yoke is held in a position of index solely by engagement of the follower face surface directly against the cam central index surface under pressure from the biasing means, with there being an arcuate spacing between each respective follower flank surface and cam biasing surface, said arcuate spacing providing a limited amount of resilient radial movement between the yoke and mounting plate to either direction from a position of index and prior to contact of a follower flank surface against a respective cam biasing surface, such radial movement being in response to a low torque between the yoke and plate, which low torque is less than the predetermined torque required to displace the follower from the cam radial ramp to the circular surface.
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Britton, Daniel W.; Fleming, Wesley Justin; Singh, Paramjit, Accessory cross bar for a bicycle trailer.
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