Lee Allen,David Alan Ransley,Diego Rodriguez Gamallo
申请号：
GB201612933
公开号：
GB2552509A
申请日:
2016.07.26
申请国别(地区):
GB
年份:
2018
代理人:
摘要：
A lead screw mechanism 160, for example for a vehicle access ramp, comprising a support frame 110, a lead screw 150 and an internally-threaded mounting 160. The lead screw has an external thread and is rotatably mounted to the support frame. The mounting comprises a housing 161 and an internally-threaded insert 170 which is rotatably mounted in the housing and engages with the lead screw such that, when the lead screw rotates, the mounting travels along the lead screw. The mounting further comprises a lock 164 with a locked position in which the insert is rotatably fixed relative to the housing and a released position in which the insert is able to rotate in the housing. An electric, hydraulic or pneumatic motor may be used to rotate the lead screw. Therefore when the lock is in the released position the insert is free to rotate on the screw relative to the housing allowing for a manual actuation of the mechanism for instance in the event of a power failure.
