LIFTING DEVICE
First Claim
1. A lifting device, used to carry an object, the lifting device comprising:
- a body;
a sliding member, slidably disposed on the body, used to carry the object, and capable of staying at any position between a first position and a second position;
a pulley, pivotally disposed within the body and having at least one first groove surrounding a circumference of the pulley, wherein a curvature radius of the first groove is a constant value;
a worm, being coaxial with the pulley, wherein the worm has a second groove surrounding a circumference of the worm, and a curvature radius of the second groove gradually changes;
an elastic member, disposed in the body and having a first end and a second end opposite to each other; and
a connecting member, having a first end portion connected with the second end of the elastic member and a second end portion connected with the sliding member, and winding within the first groove and the second groove,wherein when the sliding member slides from the first position to the second position, or slides from the second position to the first position, the worm and the pulley rotate at least one circle, gravity of the object and the sliding member acts in concert with the curvature radius of the first groove to generate a first torque, elastic member is elastically deformed and correspondingly generates a force, the force acts in concert with the curvature radius of the second groove to generate a second torque, and a sum of the first torque and the second torque is zero.
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Accused Products
Abstract
A lifting device including a body, a sliding member, a pulley, a worm, an elastic member and a connecting member is provided. The sliding member is used to set an object and stays at any position between two positions. The pulley has a fist groove. A curvature radius of the first groove is a constant value. The worm has a second groove. A curvature radius of the second groove is a non-constant value. The elastic member is disposed in the body. When the sliding member is slid between the two positions, the pulley and the worm are rotated in at least one circle. A sum which a first torque generated by a gravity of the object and the sliding member with the curvature radius of the first groove and a second torque generated by a force of the elastic member with the curvature radius of the second groove is zero.
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Citations
11 Claims
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1. A lifting device, used to carry an object, the lifting device comprising:
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a body; a sliding member, slidably disposed on the body, used to carry the object, and capable of staying at any position between a first position and a second position; a pulley, pivotally disposed within the body and having at least one first groove surrounding a circumference of the pulley, wherein a curvature radius of the first groove is a constant value; a worm, being coaxial with the pulley, wherein the worm has a second groove surrounding a circumference of the worm, and a curvature radius of the second groove gradually changes; an elastic member, disposed in the body and having a first end and a second end opposite to each other; and a connecting member, having a first end portion connected with the second end of the elastic member and a second end portion connected with the sliding member, and winding within the first groove and the second groove, wherein when the sliding member slides from the first position to the second position, or slides from the second position to the first position, the worm and the pulley rotate at least one circle, gravity of the object and the sliding member acts in concert with the curvature radius of the first groove to generate a first torque, elastic member is elastically deformed and correspondingly generates a force, the force acts in concert with the curvature radius of the second groove to generate a second torque, and a sum of the first torque and the second torque is zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification