Pulleys for bondage suspension

Pulleys for bondage suspension

For those into or wanting to explore bondage suspension it would probably be a good idea to purchase the appropriate means of doing it without injury to your back and the person whom you are suspending. I have collected antique pulleys for bondage suspension for sometime, the wooden ones particularly. Something about old wood restored. A pulley for those who don’t know is a wheel with a grooved rim for carrying a line, rope, wire rope or chain, turning in aframe or block and serving to change the direction of or transmit power, as in pulling at one end of the line to raise a weight at the other end. A combination of such wheels in a block or blocks to increase the power applied. In other words you can increase the power needed to pull a dead weight quite considerably by using pulleys, plus control the actual lift.

Important before you start attaching pulleys to ceiling beams that you actually ascertain whether the ceiling joists can take the weight. Some of the old garages and basements around have RSJ’s in the form of a channel steel girder. Bit like a railway line with a lip. You can actually attach a sliding wheel housing to these which allows you to slide the housing to whatever position you want it across the girder’s reach. The housing contains an opening through which the pulley block with hook can be placed.

I would use a secure chain as a means of attaching a block pulley to a beam rather than a rope. I would also recommend you use a good quality manila or hemp rope hawer laid which are 20% stronger than a shroud laid rope. All topes are measured by their circumference, and they reeve through a common wood block whose length is three times their size, and through a climp block twice their size. Calling the size of the rope, in inches – C – we find its strengths as follows:

Breaking strength = C² divided by 3 gives us the breaking strain in tons.
Proof strength = C² divided by 4
Safe working load for occasional lift = C² divided by 7
Safe working load for continuous working = C² divided by 18

When a purchase is put on to the fall of another purchase, as with a liff upon luff, the resultant purchase obtained is equal to the power of the first purchase multiplied by the power of the second purchase.

If the above makes absolutely no sense to you whatsoever it is probably advisable to seek professional help when you are installing or thinking of installing a system of pulleys. You will of course have to maintain the pulleys and see that they are oiled from time to time and ropes checked for damage. But once a system is in place there is very little maintenance involved. Of course some pulleys can accomodate chain. Great if you love the sound a chain pulley makes – not so great if you live close to neighbours.

Pulleys for bondage suspension

Single Whip

A rope rove through a single block pulley fixed in any position. No lifting power gained at all.

Double Whip

A rope rove through two single pulley blocks – upper block a tail block, lower block a movable hook block. Lifting power gained – double.

Watch Tackle or Luff Tackle

Double hook block and single hook block

Double Luff

Two double blocks

Single Spanish Burton

Two single blocks and a hook – lifting power gained – three times.

Double Spanish Burton

There are two forms of this purchase, the above my using three single blocks, or the one below using one double block and two single blocks – lifting power gained – five times.

Three-fold Purchase

Three-fold standing for the number of pulley wheels housed in the block. One single length of rope is roved through the pulleys. Two three-fold blocks – lifting power gained – six to seven times.

Four-fold Purchase

Two four-fold blocks containing four pulleys each -lifting power gained – eight to nine times.

Gun Tackle

Two single blocks – lifting power gained – two or three times – according to which is the movable block.

Handy Billy or Jigger

A small tackle for general use usually attacked to a line or rope; a double block with a tail and a single block with hook.

Watch our videos with bondage suspending.

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