IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0660963
(2000-09-13)
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발명자
/ 주소 |
- Figel, Gregory J.
- McCaig, Steven V.
- Siegle, Gary S.
|
출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
32 인용 특허 :
42 |
초록
▼
A chair for supporting a patient includes a base frame including a staging frame and a lower frame. The staging frame is mounted for vertical movement relative to the lower frame. An intermediate frame is coupled to the base frame for pivoting movement relative to the base frame about a generally ho
A chair for supporting a patient includes a base frame including a staging frame and a lower frame. The staging frame is mounted for vertical movement relative to the lower frame. An intermediate frame is coupled to the base frame for pivoting movement relative to the base frame about a generally horizontal transverse axis. An articulated patient support is mounted to the intermediate frame. The patient support includes longitudinally spaced back, seat, and leg sections mounted to the intermediate frame for movement relative to one another and relative to the intermediate fame. The back, seat and leg sections are movable relative to the base tame about the horizontal transverse axis. A hydraulic system includes a first hydraulic cylinder actuating vertical movement of the staging frame relative to the lower frame, a second hydraulic cylinder actuating movement of the leg section relative to the seat section, and a pump actuating both the first and second hydraulic cylinders.
대표청구항
▼
A chair for supporting a patient includes a base frame including a staging frame and a lower frame. The staging frame is mounted for vertical movement relative to the lower frame. An intermediate frame is coupled to the base frame for pivoting movement relative to the base frame about a generally ho
A chair for supporting a patient includes a base frame including a staging frame and a lower frame. The staging frame is mounted for vertical movement relative to the lower frame. An intermediate frame is coupled to the base frame for pivoting movement relative to the base frame about a generally horizontal transverse axis. An articulated patient support is mounted to the intermediate frame. The patient support includes longitudinally spaced back, seat, and leg sections mounted to the intermediate frame for movement relative to one another and relative to the intermediate fame. The back, seat and leg sections are movable relative to the base tame about the horizontal transverse axis. A hydraulic system includes a first hydraulic cylinder actuating vertical movement of the staging frame relative to the lower frame, a second hydraulic cylinder actuating movement of the leg section relative to the seat section, and a pump actuating both the first and second hydraulic cylinders. 91557, 19980800, Kunze, 236/034.5; US-5860591, 19990100, Gylov et al., 236/042; US-5927597, 19990700, Bolágar et al.; US-5934552, 19990800, Kalbacher et al., 236/012.2; US-5979777, 19991100, Ems, 236/012.2; US-5988514, 19991100, Huang, 236/012.14; US-6079625, 20000600, Lebkuchner, 236/012.2; US-6089462, 20000700, Osvaldo, 236/012.2 y to 10°-20°.3. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a number of the spiral groove groups equally-spaced arranged in circumferential direction is set to 3-30, preferably to 4-20.4. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a radial width of the groove region from R2to R3is A; a radial width of the annular flat dam from R1to R2is B; and the ratio of A to B is set to 0.5-5, preferably to 1-3, R1, R2and R3being radial distances measured from a central axis of said bi-direction rotatable face seal.5. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a number of the rows of the spiral grooves in radial direction in each spiral groove group is set to at least 3, preferably to 3-5.6. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein the half groove region that pumps the sealing fluid downstream in normal rotating direction is the primary half groove region, and the angle of a circular segment of said region, such as the included angle between a radial ray O-X and O-X1, is ß1; the other half groove region that pumps the sealing fluid downstream in reverse rotating direction is the secondary half groove region, and the angle of a circular segment of said region, such as the included angle between a radial ray O-X and O-X2, is ß2; the ratio of ß1to ß1is set to 1-5, preferably to 1-3; wherein the primary and secondary half groove region are quasi-symmetric for ß1/ß2>1 or symmetric for ß1/ß2=1, the angle of circumference of each spiral groove group, such as the included angle between radial ray O-X1 and O-X2, is ß, and ß=ß1+ß2.7. The bi-direction rotatable face seal with spiral grooves as claim in claim 6, wherein the angle of circumference of each segment land, such as the included angle between radial ray O-X1 and O-X3 or O-X2 and O-X6, is &ggr;, and the ratio of ß1to &ggr; is set to 1.2-10, preferably to 2-6.8. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a normal width a of a spiral groove is set to 0.5-5 mm, preferable to 0.5-3 mm.9. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein the at least three rows of spiral grooves in each spiral groove group are equally-spaced arranged in radial direction; each spiral land is laid between two adjacent spiral grooves; the normal width b of a spiral land is set to 0.5-5 mm, preferably to 0.5-3 mm, and the ratio of a to b is set to 0.5-2, preferably to 0.8-1.2.10. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a depth of every spiral grooves is uniform and is set to 2-20 &mgr;m, preferably to 3-10 &mgr;m.11. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a depth of every row of spiral grooves in each spiral groove group is varied in radial direction and gets more and more shallow from high pressure side to low pressure side; and the depth is set to 2-20 &mgr;m, preferably to 3-10 &mgr;m.12. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a depth of each spiral groove in each spiral groove group gets more and more shallow in circumferential direction from the fluid feed-in groove to the right or left edges and in radial direction from high pressure side to low pressure side; and the depth is set to 2-20 &mgr;m, preferably to 3-10 &mgr;m.13. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a depth of the spiral grooves in the secondary half groove region is shallower than the primary half groove region.14. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein the radial fluid feed-in groove in a spiral groove group is arranged between a radial ray O-X4 and O-X5, and the included angle δ between a radial ray O-X4 and O-X5 is set to 0.2°-2 � and the width of the groove is between 0.5-3 mm, preferably 0.5-2 mm.15. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein two walls of the radial fluid feed-in groove in a spiral groove group are parallel and a normal width S of the groove is set to 0.5-3 mm, preferably to 0.5-2 mm.16. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a depth of the radial fluid feed-in groove in each spiral groove group is uniform, and said depth is set to 3-50 &mgr;m, preferably to 10-20 &mgr;m.17. The bi-direction rotatable face seal with spiral grooves as claimed in claim 1, wherein a depth of the radial fluid feed-in groove in each spiral groove group is varied and is gradually more and more shallow from the high pressure side to the low pressure side; said depth being set to 3-50 &mgr;m, preferably to 10-20 &mgr;m.
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