发明名称 |
Screw drive engagement/disengagement and decoupling mechanism. |
摘要 |
<p>A half-nut block containing a threaded bore and a larger, overlapping, unthreaded bore is engaged with a lead screw. The larger bore overlaps the threaded bore so that effectively a half-nut results. The half-nut comprises a face having an acute angle in relation to the lead screw and this angled face contacts the inside of a bearing block within which the half-nut is mounted. The bearing block is slidably mounted on a C-tube which is mounted around and extends along a predetermined length of the lead screw. Also mounted on the C-tube is an arm for transmitting the linear motion of the bearing block to a remote point such as the plunger of a syringe. The arm is coupled to the bearing block at points selected so that transmission to the arm of any wobbling of the bearing block is reduced. The arm includes a lever which engages a cam formed on the half-nut to force the half nut to disengage from the lead screw when the arm is to be moved to a new location on the lead screw. A spring bias is coupled to the half-nut block opposite the cam for urging the half-nut block back into contact with the lead screw after disengagement. A stop mechanism prevents undesired disengagement of the half-nut block from the lead screw when force is applied other than by the cam block. <IMAGE> <IMAGE></p> |
申请公布号 |
EP0445499(B1) |
申请公布日期 |
1994.12.14 |
申请号 |
EP19910100067 |
申请日期 |
1991.01.02 |
申请人 |
IVAC CORPORATION |
发明人 |
SMITH, EUGENE P.;BOYD, ROBERT R. |
分类号 |
A61M5/145;F16H25/20;(IPC1-7):A61M5/145;A61M5/20 |
主分类号 |
A61M5/145 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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