A power wheelchair includes a frame, on which a pair of front wheel sets, a pair of middle wheel sets, a pair of rear wheel sets and a pair of elastic devices are provided. Each of the front wheel sets includes a front wheel mount having a first connection portion pivoted to the frame, and a second
A power wheelchair includes a frame, on which a pair of front wheel sets, a pair of middle wheel sets, a pair of rear wheel sets and a pair of elastic devices are provided. Each of the front wheel sets includes a front wheel mount having a first connection portion pivoted to the frame, and a second connection portion connected to a front wheel. Each of the middle wheel sets includes a middle wheel mount having a first connection portion pivoted on the frame, and a second connection portion, connected to a middle wheel. The elastic device are provided between the front wheel mounts and the middle wheel mounts respectively to cushion a swing of the front wheel set and the middle wheel set relative to the frame.
대표청구항▼
What is claimed is: 1. A power wheelchair comprising: a frame including a front, a rear and two pivot portions at opposite sides thereof; a pair of front wheel sets on the opposite sides of the front of the frame, wherein each of the front wheel sets includes a front wheel mount having a first conn
What is claimed is: 1. A power wheelchair comprising: a frame including a front, a rear and two pivot portions at opposite sides thereof; a pair of front wheel sets on the opposite sides of the front of the frame, wherein each of the front wheel sets includes a front wheel mount having a first connection portion, which is pivoted to the pivot portion of the frame, and a second connection portion, which is more distal to the frame than the first connection portion, and a front wheel connected to the second connection portion of the front wheel mount; a pair of middle wheel sets on the opposite sides of the frame between the front and the rear, wherein each of the middle wheel sets includes a middle wheel mount having a first connection portion, which is pivoted on the pivot portion of the frame, and a second connection portion, which is more distal to the frame than the first connection portion, and a middle wheel connected to the second connection portion of the middle wheel mount; a pair of rear wheel sets on the opposite sides of the rear of the frame; and a pair of elastic devices, each of which is provided between the front wheel mount and the middle wheel mount to cushion a swing of the front wheel set and the middle wheel set relative to the frame, wherein the middle wheel mount includes a frame base with a first hole portion to form the first connection portion and a transmission device, and each of the pivot portions of the frame is a tube through the first hole portion to be pivoted on the frame base and through the first connection portions of the front wheel sets to be pivoted on the front wheel mount respectively, and each of the transmission devices has a shaft to form the second connection portion for connection of the middle wheel respectively. 2. The power wheelchair as defined in claim 1, wherein each of the elastic devices has opposite ends pivoted on the front wheel mount and the middle wheel mount respectively. 3. The power wheelchair as defined in claim 2, wherein each of the elastic devices has a cushion member, which includes a cylinder with an end pivoted on the middle wheel mount and having a piston with an end pivoted on the front wheel mount and the other end inserted into the cylinder and a compression spring with opposite ends urging the cylinder and the piston. 4. The power wheelchair as defined in claim 3, wherein the cylinder includes an outer threaded section, and the cushion member includes an adjusting member screwed onto the outer threaded section of the cylinder to be turned for movement forward or backward relative to the cylinder. 5. The power wheelchair as defined in claim 1, wherein each of the middle wheel mounts has a second hole portion between the first connection portion and the second connection respectively, and each of the front wheel mounts has a third hole portion between the first connection portion and the second connection respectively, and each of the elastic devices has opposite ends connected to the second hole portion and the third hole portion. 6. The power wheelchair as defined in claim 5, wherein the frame base includes two parallel lateral plates, each of which has a hole to from the first hole portion of the frame base, and a top plate, which has two parallel axial holes to form the second hole portion, connected to the lateral plates, and the front wheel mount has a tube, which forms the first connection portion, between the lateral plates, and the pivot portion of the frame passes through the holes and the tube. 7. The power wheelchair as defined in claim 6, wherein each of the front wheel mounts includes a wheel frame connected to the tube and extended to the front of the frame to from the second connection portion at a front thereof for connection of the front wheel, and each of the wheel frames has a lateral frame, which has the third hole portion, between the first connection portion and the second connection portion. 8. The power wheelchair as defined in claim 1, further comprising a seat set mounted on a support tube of the frame between the front and the rear, wherein the support tube is more proximal to the rear wheel sets than the pivot portions of the frame.
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이 특허에 인용된 특허 (24)
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