Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1986-10-02
1988-03-01
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
74412TA, 384517, F16C 1908, F16H 2520
Patent
active
047277629
ABSTRACT:
This improved driving force support is used in a linear actuator in which rotary motion of a rotating screw shaft is converted to linear motion of a travelling nut. The driving force support comprises a pair of springs surrounding the rotating shaft and held in compression between a pair of shaft bearing receivers. The receivers and bearings held thereby move axially with the rotating shaft as axial forces are applied to the shaft by the travelling nut. The bearing receivers slide axially in a hollow housing. The springs are arranged in series between seats which normally abut the respective bearing receivers and also normally abut stop surfaces in the housing. One spring has a high degree of stiffness, and the other has a comparatively low degree of stiffness. An intermediate seat between the springs has a projection which abuts the seat on the opposite end of the weaker spring to limit the flexure of the weaker spring, while allowing it to compress as the bearing receivers move axially through a short distance. When the driving force exceeds a predetermined limit, the resulting axial movement of the bearing receivers is detected by a limit switch, which can be used to stop the actuator. During stopping, further rotation of the shaft results in compression of the stronger spring until the rotation stops.
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Staab Lawrence J.
Tsubakimoto Chain Co.
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