This invention relates to a technique for hermetically sealing an artificial leg including a cylinder device. A rod member of the cylinder device extends from the inside to the outside of a shell structure of the cylinder device. The rod member is hermetically sealed at the periphery thereof by a be
This invention relates to a technique for hermetically sealing an artificial leg including a cylinder device. A rod member of the cylinder device extends from the inside to the outside of a shell structure of the cylinder device. The rod member is hermetically sealed at the periphery thereof by a bellows packing member. The bellows packing member comprises an inner bead, an outer bead which concentrically surrounds the outside of the inner bead, and a bellows packing body part which connects the inner and outer beads. The bellows packing body part includes corrugations, and each corrugation is less curved than an imaginary circle which is concentric with the inner bead and the outer bead. Both ends of each of the plurality of corrugations extend to the outer bead or are located at positions closer to the outer bead than the inner bead.
대표청구항▼
1. A hermetically sealed artificial leg comprising: an upper member for supporting a socket at an upper end thereof;a lower member for supporting a foot part at a lower end thereof;a knee coupling for bendably coupling said upper and lower members;a cylinder device for assisting and/or limiting move
1. A hermetically sealed artificial leg comprising: an upper member for supporting a socket at an upper end thereof;a lower member for supporting a foot part at a lower end thereof;a knee coupling for bendably coupling said upper and lower members;a cylinder device for assisting and/or limiting movement of said knee coupling;a shell structure for surrounding an outside of said cylinder device;said cylinder device including a cylinder body having an axis, and a rod member extending in a direction of said axis from said cylinder body, said rod member extending from inside of said shell structure to outside thereof; anda flexible packing member for hermetically sealing a periphery of said rod member, wherein said flexible packing member includes:an inner bead defining a hole for receiving said rod member therein and serving as a sealing portion at an inner periphery of said flexible packing member for hermetically sealing the periphery of said rod member;an outer bead concentrically surrounding the outside of the inner bead, the outer bead serving as an attachment part to a side of said shell structure and also serving as a sealing portion for the side of said shell structure; anda body portion formed between said inner and outer beads and integrally connecting said inner and outer beads, the body portion comprising a plurality of corrugations aligned with each other, and being configured for varying a distance between said inner and outer beads, andwherein each of the plurality of corrugations is arc-shaped;wherein each of the plurality of corrugations is positioned between the inner bead and the outer bead,wherein both ends of each of the plurality of corrugations extend to the outer bead or are located at positions closer to the outer bead than the inner bead, andwherein the plurality of corrugations are arranged line symmetrically with respect to a first line radially passing through the central axis of the inner bead, and the plurality of corrugations are arranged line symmetrically respect to a second line being perpendicular to the first line and radially passing through the central axis of the inner bead. 2. The hermetically sealed artificial leg of claim 1, wherein said shell structure and bellows packing member define a hermetically sealed space within said shell structure. 3. The hermetically sealed artificial leg of claim 2, wherein said artificial leg is configured to be electronically controlled, and, a part of an electronic control of the artificial leg is received in said hermetically sealed space. 4. The hermetically sealed artificial leg of claim 1, wherein when said upper and lower members move with respect to each other, said rod member is expanded and contracted in an axial direction of said cylinder body and at the same time, swung in a direction crossing said axis to deform said bellows packing body part. 5. The hermetically sealed artificial leg of claim 4, wherein, when said upper and lower members move with respect to each other, said inner bead is configured to move in a predetermined radial direction of said outer bead. 6. The hermetically sealed artificial leg of claim 1, wherein said cylinder body includes a rod guide for guiding said rod member, and said rod guide supports said inner bead. 7. The hermetically sealed artificial leg of claim 6, wherein said rod guide has a cylindrical shape and is provided, at an inner periphery of said rod guide, with a guide surface for guiding an outer periphery of said rod member and, at an outer periphery of said rod guide, with a ring groove into which said inner bead is received. 8. The hermetically sealed artificial leg of claim 7, wherein said ring groove is provided, at an opening part thereof, with a stopper adapted to retain said inner bead in the ring groove and to retain said inner bead in the ring groove during a movement of the inner bead caused by a movement of the knee coupling. 9. The hermetically sealed artificial leg of claim 1, wherein a rod end of said rod member of said cylinder device is located on a side of said upper member, while a cylinder head of said cylinder body of said cylinder device is located on a side of said lower member. 10. The hermetically sealed artificial leg of claim 9, wherein the inner bead has substantially the same height as the outer bead, in a sectional view taken along a longitudinal direction of the rod member. 11. The hermetically sealed artificial leg of claim 9, wherein the inner bead and the outer bead have different heights from each other, in a sectional view taken along a longitudinal direction of the rod member. 12. The hermetically sealed artificial leg of claim 1, wherein each of the plurality of corrugations in said bellows packing body part maintains the same height from said inner bead to said outer bead. 13. The hermetically sealed artificial leg of claim 12, wherein a height of each of the plurality of corrugations is smaller than a distance from said inner bead to said outer bead, when said bellows packing body part is in a non-deformed state. 14. The hermetically sealed artificial leg of claim 1, wherein connection of said knee coupling includes a single-axis connection or a multi-axis connection. 15. The hermetically sealed artificial leg of claim 1, wherein said cylinder device is selected from the group consisting of a hydraulic cylinder, a spring cylinder, a pneumatic cylinder and a linear actuator.
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