The chain hoist has either a lever to power the hoist or a loop of operating chain pulls through the block of the hoist which then powers the block that takes up the main lifting chain.
@Texasmule3 ай бұрын
The lever is much more useful on loads more then 3 tons unless you can find one cheaper. Otherwise the manual chain is alot easier on your wrist
@akashrana516611 ай бұрын
Thank You, Very Conceptual Video👍👍
@joestepien8594 Жыл бұрын
Aside from the gearing which provides the 30 to 1 mechanical advantage, the principle is based on the physics definition of WORK. That is, WORK = FORCE x DISTANCE. In this case you use say 1 lb of force a distance of 30 inches (the 30 to 1 mech advantage) or 30 lb-in of work which is equivalent to having lifted 30 lb 1 in, 30 lb-in as well, without the mechanical advantage.
@user-zz3yv5be1q Жыл бұрын
你的描述很棒,我们可以提供最优质的链条
@jameswright-20245 ай бұрын
this is a system that is based on gear reduction ratio (7/5 x 18/4 x 19/4) and not a system of simple pulleys where the mechanical advantage is not the major advantage but a simple leverage as you mention in your question (a torque that is simply created by the distance multiplied by the input force). Gears are much efficient and do indeed provide mechanical advantage.
@ahobimo7327 жыл бұрын
Gotta love that 80s metal soundtrack during the disassembly segment.
@hugolafhugolaf10 ай бұрын
You know they mean business when they play that.
@chandrachurdmandal55503 жыл бұрын
Just awesome explanations
@JohnBobRoger5 жыл бұрын
Can you swap out the chain and use rope? 50 foot lift. For hoisting yourself up a mast and you have a halyard on a sheave at top. .
@jamesgrant75857 ай бұрын
Why did he use bolt cutters on the hand chain if he was taking it apart anyway?
@ajayapattnaik627 Жыл бұрын
How you calculate that it can raise 30 times more load than the effort??
@jameswright-20245 ай бұрын
7/5 x 18/4 x 19/4
@kramali60886 жыл бұрын
nice demonstration
@abdulraziq94255 жыл бұрын
Really it is good
@sudhirpatil34349 жыл бұрын
How does brake work??
@Texasmule3 ай бұрын
Rachet system have a reverse tooth gear that doesn't allow the system to move the other way unless a certain key is turned that reverse the pick
@telosfd11 жыл бұрын
For your SAFETY!!! Take care for Chinese Chain Hoist.
@basitmalik1502 жыл бұрын
That break. It can only stops in one direction. What about the other direction of pulling the chain....?
@ccaissie1132 жыл бұрын
yeah he failed to explain that....some of these videos are junk. I hope somebody fixes this so that people are more than halfway informed.
@TheLimbReaper11 жыл бұрын
I've never taken apart a chain hoist myself. Then again I've never had to climb up and release the "dog" they show holding that gear either.
@jacobyunderhill39993 жыл бұрын
This is infuriatingly incorrect. There is minimal stress on the first, 5-tooth gear. The twin gears aren't there to help that guy out. They exist to distribute the load of the next stage, the load on the 4 tooth gears. Those are under much higher stress. Notice how thick those 3 gears are compared to the others.
@moustafarefaat61556 жыл бұрын
what kind of metal used is it hard steel or just iron ?
@kentsimpson88042 жыл бұрын
Thanks, good job
@chandankumar-jp4li4 жыл бұрын
Very good video. Thanks.
@Ham54911 жыл бұрын
Everybody wonders that but nobody ever gives a good answer.
@TV-mv6nx4 жыл бұрын
Nice video
@ajayapattnaik627 Жыл бұрын
Can anyone give its velocity ratio calculations??
@barbooosa9 жыл бұрын
Thanks for the video!
@ziia05284 жыл бұрын
Fuc**ng awesome invention.
@alejandrorodriguez95547 жыл бұрын
Importantisssimo vid.
@mahadevaswamyp8213 жыл бұрын
How much amount pls
@90sforever764 жыл бұрын
Chain kuppe line h bhai kaha milege
@causeformayhem2 жыл бұрын
I got 17.1 times force with my calculations. Ofc I had to use an assumed torque of 55.6Nm
@ajayapattnaik627 Жыл бұрын
Can you please give the calculation??
@abhishekprajapati5285 жыл бұрын
Nice
@Tonys_Podium10 жыл бұрын
How does sit lower without engaging the ratchet pawl?
@Ham54910 жыл бұрын
Check out the video "Automatic brake in spur gear hoist" and read the expiation.
@afifmahmoud65229 жыл бұрын
a glutch
@abousamah19679 жыл бұрын
Nice شرح جميل هل اجد ترجمه عربيه
@makineedivenkataramana74304 жыл бұрын
Well explained, Thank you
@leandrojr.picson584 жыл бұрын
I think the Larger gear is moving slow than the Smaller Gear, the pull of man should be at the small gear, just commenting
@causeformayhem2 жыл бұрын
The reason for this is to and another weight reduction. It's a concept similar to that of the wheel and axle.
@salemsaleh.19028 жыл бұрын
How many tons could it lift ?
@noshaosama33317 жыл бұрын
I've seen it at work. It lefts 2 tons, but I don't know if they are limited to such weight
@ccaissie1132 жыл бұрын
So, dude, when you turn the chaiin the other way to lower it, how does it do it against the ratcheting pawl? Explain that.....
@mahmoudlasheen57622 жыл бұрын
Did u know? I was looking for an answer
@causeformayhem2 жыл бұрын
It uses a clutch that disengages the hand chain sprocket from the ratchet. Meaning the ratchet and pawl stay stuck but hand chain sprocket can initiate the backwards movement lowering the load. When the hand wheel stops moving the clutch engages and the load stays in place
@naturafibre79052 жыл бұрын
and that mechanism didn't explained in the video
@KhuongNguyen-jv4it9 жыл бұрын
excellent
@user-mz6le4gr3d6 жыл бұрын
ราคาเทาไรครับ
@fadi_koka8 жыл бұрын
How about backward
@l337pwnage8 жыл бұрын
+Fadi Koka same thing, but in reverse. Sounds like smart ass answer, but, it's basically true. Look at the clutch that was tightened up at the beginning. Look at the screw threads on the main shaft. When you go backwards, you loosen the clutch and the load slips down. "Why doesn't it freewheel?", you ask. Glad you asked that. :) The load spins the driveshaft which tightens the clutch from the other side, and once the clutch is tight, that pawl(usually there are two pawls in that style of hoist) stops the load from dropping.
@mahmoudlasheen57622 жыл бұрын
@@l337pwnage and how do u detach the clutch from the other side?
@l337pwnage2 жыл бұрын
@@mahmoudlasheen5762 I think I understand your confusion, but I'm not sure. When raising, the clutch just stays tight and is held by the force of the load against the operator or pawl. The clutch is "pinched" by the force created by the threads the chainwheel threads on to. The only time the clutch slips is when you lower the load. When you lower the load, you are "unpinching" the clutch, but the force of the load quickly spins the gears and the main shaft, which tightens the clutch again, which results in the load being slightly lower.
@sert874 жыл бұрын
Gotta keep those 12 year olds interested with cheesy montage and music.
@kamalkamalov5 жыл бұрын
Tenks
@mytube43856 жыл бұрын
WHY HAND CHAIN ISNT DRIVE WITH SOME KIND OF SMALL ELECTRIC MOTOR??
@jasond47526 жыл бұрын
That's why it has a chain, for manual hand use. Hoists with electric motors don't have a chain.
@michaellynch98624 жыл бұрын
my tube low duty cycle. Hoists are commonly equipped with electric motors.
@ryanhogge84 жыл бұрын
These hoists are already fairly heavy, but for mobile use a powered hoist would be prohibitively heavy. Not only are the powered chain hoists heavier, they also take up more space, which can in some circumstances make them useless. And finally, the manual ones are less expensive.