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Patent Details

Indian Institute of Technology (IIT) Roorkee 
Mechanical safety device for thread failure in power screw based heavy lifts 
Apurbba K. Sharma*, Nitesh Arora and Prabha Pal Singh Seerha  
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2018-07-26 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
Present invention proposed a design of a fully mechanical safety device which prevents falling of load due to breakage of power screw threads due to wear in screw based lifts. Due to repeated heavy lifting operations using power screw based lifts, screw threads fails due to wear load may slip which may cause accident. The safety device is completely mechanical, low cost, self-powered setup comprising of mechanical sensor nut which detects failure in screw thread by sensing relative motion between load and screw (slippage) and activating a clutch which lock the load in its place. The device has a low response time ( ̴ 2ms), does not require any additional power supply which makes it reliable. 

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