Safety stop for lifting apparatus
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- เผยแพร่เมื่อ 26 ส.ค. 2024
- This mechanism is applied for hand powered lifting apparatus.
When there is a pulling force in blue cable, the yellow rod compresses brown leaf spring and the grey frame can move up down.
When there is no pulling force in blue cable or the cable is broken, the brown spring via yellow rod and green levers pushes two pink pawls into contact with two stationary racks thus the frame is kept immobile.
The moving down is a jerk proccess, pulling force in cable is only big enough to prevent the pawls from contact with the racks.
The video shows how the frame goes up, stops, goes down, stops, goes up again and stops when the cable is broken.
Leaf spring can be replaced with helical cylindrical one.
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The Otis Safety Elevator since 1880
It is my contribution to your great work, duc !! you had mentioned me to send you the sketch of the water pump with bellows, in the book of the link appears as number 453 you could do the simulation and upload the video?
As for mechanism 453 I can't make its animation because of the bellows. Their deformation during motion is impossible to be simulated in Autodesk Inventor.
This is very similar to safety brakes on an elevator.
I also had the same idea like this. thankyou
This is not my idea.
It is mechanism numbered as 278 in the book:
Henry T. Brown, 507 Mechanical Movements, New York 1908,122 p.
I am finding the address to download that book. Thankyou
hello duck, could you make the animation video for the membrane pump, that Brown's book is reference number 454, please?
As for mechanism 454 I have similar ones:
th-cam.com/video/8xv21E7XKBU/w-d-xo.html
th-cam.com/video/HoGTiXtCKmY/w-d-xo.html
ok with bellows not...and number 454 with membrane pump is possible,please?
Bellows or membranes are deformed during motion.
Autodesk Inventor gives up before them.
Maybe there are tricks to animate their motion but I don't know.
Elisha Otis
when you are bringing it down, it will get jammed.
When applying a moderate force (big enough for pressing the spring but not bigger than the load) to the cable, the load can go down.
It is rather difficult to keep such force constant so the moving down is a jerk proccess.
This mechanism is numbered as 278 in the book:
Henry T. Brown, 507 Mechanical Movements, New York 1908,122 p.
only get jam when it is at free fall i.e. rope broken... any other case the blue sure got some tension~