A pulley includes a tensioning device and a ratchet device disposed in the tensioning device. The tensioning device includes a first shell, a second shell installed to the first shell, and a first compartment defined in a side thereof. The tensioning device further includes a first block and a secon
A pulley includes a tensioning device and a ratchet device disposed in the tensioning device. The tensioning device includes a first shell, a second shell installed to the first shell, and a first compartment defined in a side thereof. The tensioning device further includes a first block and a second block located in the first compartment, with the first and second blocks adapted to pivot in the tensioning device. The ratchet device includes an actuating element, a ratchet, a first gripping element and a second gripping element, with the ratchet, the first and second gripping elements mounted onto the first block in sequence, with the actuating element provided to control the pivoting direction of the ratchet as to limit the direction of pulling a rope, which is winded between the first and second gripping elements.
대표청구항▼
What is claimed is: 1. A pulley, comprising: a tensioning device which is the combination of a first shell and a second shell including a first compartment defined in a side of the interior of one of the first and second shells, a second compartment defined in the other side of the interior opposit
What is claimed is: 1. A pulley, comprising: a tensioning device which is the combination of a first shell and a second shell including a first compartment defined in a side of the interior of one of the first and second shells, a second compartment defined in the other side of the interior opposite to the first compartment, a first block pivotally connecting to the first shell and located in the first compartment, and a second block pivotally connecting to the second shell and located in the first compartment, with the first and second blocks connecting to each other; and a ratchet device disposed in the tensioning device and including a ratchet, a first gripping element, a second gripping element and an actuating element pivotally installed in the second compartment, with the ratchet and the first and second gripping elements mounted onto the first block in sequence; wherein the actuating element includes a first restrict portion formed thereon and projecting downward therefrom between the first and second gripping elements and a second restrict portion protruding therefrom and adapted to block the ratchet. 2. The pulley as claimed in claim 1 further comprising a first receiving hole located in the first compartment on the first shell and a second receiving hole located in the first compartment on the second shell and corresponding to the first receiving hole, with the first block received in the first receiving hole and the second block received in the second receiving hole. 3. The pulley as claimed in claim 2, with the first block including a protrusion adapted to insert in the first receiving hole and a recess formed opposite to the protrusion, with the second block including a distal end adapted to be received in the recess of the first block and another end opposite to the distal end adapted to insert in the second receiving hole. 4. The pulley as claimed in claim 3, with the distal end of the second block having a reduced diameter. 5. The pulley as claimed in claim 1, with the ratchet having a hole therethrough, with the first gripping element having a hole therethrough, with the second gripping element having a hole therethrough; wherein the shapes of the holes correspond to the outer periphery of the first block. 6. The pulley as claimed in claim 1, with the first gripping element including a plurality of gripping portions radially arranged thereon against the second gripping element, with the second gripping element including a plurality of gripping portions radially arranged thereon against the gripping portions of the first gripping element; wherein the gripping portions have a plurality of notches thereon as to retain a rope in the pulley. 7. The pulley as claimed in claim 1, with the first shell including a first inserted hole in the second compartment and the second shell including a second inserted hole in the second compartment relative to the first shell, with the actuating element including an axle and an operating portion, wherein two ends of the axle are respectively received in the first and second inserted holes, and the operating portion protrudes form the tensioning device and is provided for operating. 8. The pulley as claimed in claim 7, the ratchet device including an elastic element mounted on the axle adjacent to the second shell; wherein the elastic element has a first end and a second end stretching therefrom, with the first end abutting with the inner wall of the second compartment and the second end abutting with the operating portion of the actuating element. 9. The pulley as claimed in claim 1, with the tensioning device including a coupler partially disposed therein and having a detachable bolt, with the first shell including a first limited hole formed therethrough and the second shell including a second limited hole formed therethrough relative to the first limited hole; wherein the coupler includes a U-shaped first end stretching from the tensioning device and a O-shaped second end disposed in the tensioning device; wherein the bolt is adapted to insert the first limited hole, the second end of the coupler and the second limited hole as to retain the coupler with the tensioning device.
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