In one aspect the invention provides a safety lock device, for use with a pump-jack having a gear box and at least one rotating member, the safety lock device comprising an engagement member suitable for securely engaging the rotating member to prevent further substantial rotation of said rotating member and a mounting frame to mount the safety lock device to the gear box. The engagement member may be actuated between a locked position and an unlocked position.
Safety lock device for pump-jack
2017-02-21
Patent
Electronic Resource
English
Car lifting jack safety control device and car lifting jack
European Patent Office | 2021
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