A stretcher including an upper frame for mounting a lifter thereon, a front leg pivotably attached to the upper frame, a rear leg pivotably attached to the upper frame, a fixed caster attached to one end of the front leg, a swivel caster attached to one end of the rear leg, and an auxiliary swivel c
A stretcher including an upper frame for mounting a lifter thereon, a front leg pivotably attached to the upper frame, a rear leg pivotably attached to the upper frame, a fixed caster attached to one end of the front leg, a swivel caster attached to one end of the rear leg, and an auxiliary swivel caster attached to the front leg, wherein the upper frame is vertically adjustable by folding the front and rear legs relative to the upper frame, and wherein the auxiliary swivel caster is positioned relative to the fixed caster such that the auxiliary swivel caster is in contact with the ground when the upper frame is fully lowered and the front leg is folded away from the rear leg, and the auxiliary swivel caster is out of contact with the ground when the upper frame is fully lowered and the front leg is folded toward the rear leg.
대표청구항▼
1. A stretcher, comprising: an upper frame for mounting a lifter thereon;a front leg pivotably attached to the upper frame;a rear leg pivotably attached to the upper frame;a fixed caster attached to one end of the front leg;a swivel caster attached to one end of the rear leg;an auxiliary swivel cast
1. A stretcher, comprising: an upper frame for mounting a lifter thereon;a front leg pivotably attached to the upper frame;a rear leg pivotably attached to the upper frame;a fixed caster attached to one end of the front leg;a swivel caster attached to one end of the rear leg;an auxiliary swivel caster attached to the front leg; anda brake assembly for applying braking force to the swivel caster;wherein the front leg and rear leg are arranged to move in the same direction and in opposite directions and the brake assembly is arranged to apply braking force to the swivel caster when the stretcher is fully lowered and the front and rear legs are arranged in the same direction or opposite directions;wherein the upper frame is vertically adjustable by folding the front and rear legs relative to the upper frame;wherein the auxiliary swivel caster is positioned relative to the fixed caster such that the auxiliary swivel caster is in contact with the ground when the upper frame is fully lowered and the front leg is folded away from the rear leg, and the auxiliary swivel caster is out of contact with the ground when the upper frame is fully lowered and the front leg is folded toward the rear leg;wherein the brake assembly includes a spring-biased button that is depressed by engaging with the upper frame to actuate the brake when the upper frame is fully lowered, and is released from contact with the upper frame when the upper frame is raised to disengage the brake; andwherein a stopper is arranged to cooperatively engage the frame when in the lowered position to control swiveling movement of the auxiliary swivel caster. 2. The stretcher according to claim 1, wherein the front and rear legs are independently pivotable relative to the upper frame such that the upper frame can achieve a horizontal position on an angled ground surface. 3. The stretcher according to claim 1, wherein both the fixed caster and the auxiliary swivel caster are in contact with the ground when the upper frame is at an intermediate vertical position. 4. The stretcher according to claim 1, wherein an upper end of the front leg circumferentially surrounds and engages a tubular member of the upper frame and is horizontally slidable along the tubular member of the upper frame. 5. The stretcher according to claim 1, wherein the vertical height of the stretcher when fully lowered in from 300 mm to 700 mm above the ground. 6. A stretcher, comprising: an upper frame supporting a lifter;a slide mechanism including a slide tube mounted to the upper frame for driving vertical movement of the upper frame;a front leg having an upper end slidably and pivotably attached to the slide tube and having a lower end with a fixed caster attached thereto;a rear leg assembly including a rear leg and a rear auxiliary leg each pivotably attached to the upper frame;a swivel caster attached to a lower end of the rear leg through a pivoting link; a support arm attached to the rear auxiliary leg and the pivoting link;an auxiliary swivel caster mounted to the front leg above the fixed caster; anda brake assembly for applying braking force to the swivel caster, wherein:the front leg and rear leg are arranged to move in the same direction and in opposite directions and the brake assembly is arranged to apply braking force to the swivel caster when the stretcher is fully lowered and the front and rear legs are arranged in the same direction or opposite directions; wherein:wherein the brake assembly includes a spring-biased button that is depressed by engaging with the upper frame to actuate the brake when the upper frame is fully lowered, and is released from contact with the upper frame when the upper frame is raised to disengage the brake; andwherein a stopper is arranged to cooperatively engage the frame when in the lowered position to control swiveling movement of the auxiliary swivel caster. 7. The stretcher according to claim 6, wherein the vertical height of the stretcher when fully lowered in from 300 mm to 700 mm above the ground. 8. A stretcher, comprising: a frame for mounting a lifter thereon;front and rear leg assemblies cooperatively supporting the frame and configured to pivot relative to the frame to change the vertical position of the frame relative to the ground, the front leg assembly including a front leg horizontally slidable along the frame and the rear leg assembly including a rear leg pivotably attached to the frame;a fixed caster attached to one end of the front leg;a swivel caster attached to one end of the rear leg;an auxiliary swivel caster attached to the front leg and positioned relative to the fixed caster such that, with regard to the fixed caster and the auxiliary swivel caster, only the fixed caster is in contact with the ground when the frame is fully raised, only the fixed caster is in contact with the ground when the frame is fully lowered and the front leg is folded toward the rear leg, and only the auxiliary swivel caster is in contact with the ground when the frame is fully lowered and the front leg is folded away from the rear leg; anda brake assembly for applying braking force to the swivel caster;wherein the front leg and rear leg are arranged to move in the same direction and in opposite directions and the brake assembly is arranged to apply braking force to the swivel caster when the stretcher is fully lowered and the front and rear legs are arranged in the same direction or opposite directions;wherein the brake assembly includes a spring-biased button that is depressed by engaging with the upper frame to actuate the brake when the upper frame is fully lowered, and is released from contact with the upper frame when the upper frame is raised to disengage the brake; andwherein a stopper is arranged to cooperatively engage the frame when in the lowered position to control swiveling movement of the auxiliary swivel caster. 9. The stretcher according to claim 8, wherein the front and rear legs are independently pivotable relative to the upper frame. 10. The stretcher according to claim 8, wherein both the fixed caster and the auxiliary swivel caster are in contact with the ground when the upper frame is at an intermediate vertical position. 11. The stretcher according to claim 8, wherein an upper end of the front leg is pivotably and slidably attached to a tubular member of the upper frame. 12. The stretcher according to claim 8, wherein the vertical height of the stretcher when fully lowered in from 300 mm to 700 mm above the ground.
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이 특허에 인용된 특허 (12)
Bloemer Guenter (Bergisch Gladbach DEX), Carriage for a stretcher.
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