An operating shaft rises and falls by abutting against a cam surface of a cam rotatably built into the upper part of a stem. A swivel-preventing plate part is fixed to the lower end of the operating shaft. An engagement member is fixed to a support yoke and regulates the swiveling by engaging with t
An operating shaft rises and falls by abutting against a cam surface of a cam rotatably built into the upper part of a stem. A swivel-preventing plate part is fixed to the lower end of the operating shaft. An engagement member is fixed to a support yoke and regulates the swiveling by engaging with the swivel-preventing plate part. A brake shoe part is fixed to the lower part of the swivel-preventing plate part and brakes by abutting against a treat surface of a wheel when the operating shaft falls. A link cam causes a link cam to pivot and causes a brake plate to rise and fall by connected to the brake shoe part. A protruding part for braking, by displacement of the brake plate, is capable of engaging with and disengaging from an annular engagement receiving part formed in the inner periphery of the wheel.
대표청구항▼
1. A double-lock caster comprising: a stem erected on a support yoke which pivotally supports a wheel; a cam which is incorporated in an upper part of the stem and rotates by a rotary shaft; a plurality of braking and braking release cam surfaces formed at predetermined positions on an outer periphe
1. A double-lock caster comprising: a stem erected on a support yoke which pivotally supports a wheel; a cam which is incorporated in an upper part of the stem and rotates by a rotary shaft; a plurality of braking and braking release cam surfaces formed at predetermined positions on an outer peripheral surface of the cam; an operating shaft which abuts against the cam surfaces and slides up and down; a swivel-preventing plate part fixed to a lower end of the operating shaft; an engagement member which is fixed to the support yoke, and engages with the swivel-preventing plate part to regulate swiveling of the support yoke; a brake shoe part which is fixed to a lower part of the swivel-preventing plate part, and abuts against a tread surface of the wheel by downward movement of the operating shaft to perform braking; a link cam which is coupled with the brake shoe part, and has one end side pivotally supported by a bearing part extending to an outer side of the wheel and the other end side being latched on a brake plate which slides up and down along an outer surface of the support yoke; and a braking protruding part which is provided on the brake plate and engageable with an annularly continuous engagement receiving part formed on an inner peripheral side surface of the wheel, wherein downward movement of the operating shaft causes the engagement member to engage with the swivel-preventing plate part and causes the brake shoe part to abut against the tread surface of the wheel and, at the same time, pivotal movement of the link cam causes the brake plate to slide so that the braking protruding part engages with the engagement receiving part of the wheel, thereby performing swivel regulation and double braking;wherein a vertically extending slit is formed in a back surface of the support yoke, anda rail part having a T-shaped cross section is provided to protrude on a back surface of a support member which supports the engagement member, a central piece of the rail part is inserted into the slit to latch the support member on the support yoke, and a fixing shaft is press-fitted into a hole laterally piercing through the support yoke and the support member to fix the engagement member to the support yoke through the support member. 2. The double-lock caster according to claim 1, wherein a through hole which communicates with holes provided in side surfaces of the support yoke and laterally extends is provided in the support member, a part of the hole of the through hole is set to a press fitting dimension, and the engagement member is fixed to the support yoke through the support member by press-fitting the fixing shaft. 3. The double-lock caster according to claim 1, wherein the swivel-preventing plate part is formed into a plate-shape, and has engagement receiving parts provided on an upper surface and a lower surface thereof, andthe engagement member has a pair of engagement parts which are vertically apart from each other, the receiving part on the upper surface of the swivel-preventing plate part becomes engageable with the upper engagement part by a displacement of the operating shaft, and the receiving part on the lower surface of the swivel-preventing plate part becomes engageable with the lower engagement part by a further displacement of the operating shaft. 4. The double-lock caster according to claim 2, wherein the swivel-preventing plate part is formed into a plate-shape, and has engagement receiving parts provided on an upper surface and a lower surface thereof, andthe engagement member has a pair of engagement parts which are vertically apart from each other, the receiving part on the upper surface of the swivel-preventing plate part becomes engageable with the upper engagement part by a displacement of the operating shaft, and the receiving part on the lower surface of the swivel-preventing plate part becomes engageable with the lower engagement part by a further displacement of the operating shaft. 5. The double-lock caster according to claim 1, wherein the swivel-preventing plate part is formed by a cold forging process, and the engagement receiving part on the lower surface is formed of many annularly continuously arranged irregularities, and grooves are provided along proximal ends of convex gear parts respectively. 6. The double-lock caster according to claim 2, wherein the swivel-preventing plate part is formed by a cold forging process, and the engagement receiving part on the lower surface is formed of many annularly continuously arranged irregularities, and grooves are provided along proximal ends of convex gear parts respectively. 7. The double-lock caster according to claim 3, wherein the swivel-preventing plate part is formed by a cold forging process, and the engagement receiving part on the lower surface is formed of many annularly continuously arranged irregularities, and grooves are provided along proximal ends of convex gear parts respectively. 8. A double-lock caster comprising: a stem erected on a support yoke which pivotally supports a wheel; a cam which is incorporated in an upper part of the stem and rotates by a rotary shaft; a plurality of braking and braking release cam surfaces formed at predetermined positions on an outer peripheral surface of the cam; an operating shaft which abuts against the cam surfaces and slides up and down; a swivel-preventing plate part fixed to a lower end of the operating shaft; an engagement member which is fixed to the support yoke, and engages with the swivel-preventing plate part to regulate swiveling of the support yoke; a brake shoe part which is fixed to a lower part of the swivel-preventing plate part, and abuts against a tread surface of the wheel by downward movement of the operating shaft to perform braking; a link cam which is coupled with the brake shoe part, and has one end side pivotally supported by a bearing part extending to an outer side of the wheel and the other end side being latched on a brake plate which slides up and down along an outer surface of the support yoke; and a braking protruding part which is provided on the brake plate and engageable with an annularly continuous engagement receiving part formed on an inner peripheral side surface of the wheel, wherein downward movement of the operating shaft causes the engagement member to engage with the swivel-preventing plate part and causes the brake shoe part to abut against the tread surface of the wheel and, at the same time, pivotal movement of the link cam causes the brake plate to slide so that the braking protruding part engages with the engagement receiving part of the wheel, thereby performing swivel regulation and double braking;wherein a pair of hook-shaped bearing parts which extend downward on outer sides of left and right side surfaces of the wheel and have folded distal ends are provided to the brake shoe, a protruding pivot is born by the hook parts in the vicinity of a proximal end of the link cam, and a distal end of the link earn is locked to a pair of brake plates which slide up and down along outer surfaces of left and right side surfaces of the support yoke. 9. The double-lock caster according to claim 8, wherein a through hole which communicates with holes provided in side surfaces of the support yoke and laterally extends is provided in the support member, a part of the hole of the through hole is set to a press fitting dimension, and the engagement member is fixed to the support yoke through the support member by press-fitting the fixing shaft.
Figel, Gregory J.; Rudolf, Kenneth Q.; Albersmeyer, David A.; Heimbrock, Richard Henry; Walke, James L.; Michael, Brian P.; Suttman, Glenn C.; Turner, Jonathan D.; Wiggins, Brian T.; Weiler, Martin D., Stretcher having hand actuated caster braking apparatus.
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