A compact and efficient block-and-tackle apparatus.

A compact and efficient block-and-tackle apparatus.

There is provided herein a load-lifting device for personal or mechanical use, a method of operating the load-lifting device and a fishing pole having the load-lifting device.

There is provided herein a load-lifting device for personal or mechanical use, a method of operating the load-lifting device and a fishing pole having the load-lifting device.

A hook device includes a central shaft which extends in a first direction, and a first locking portion and a second locking portion which are disposed such that the central shaft is interposed therebetween, in a second direction orthogonal to the first direction. The first locking portion and the second locking portion are connected to the central shaft in a state where the first locking portion and the second locking portion are not rotatable independently around an axis extending in the first direction and are rotatable around an axis extending in a third direction different from the first direction and the second direction.

A pulley device includes a strap loop, a cord-securing component and cord respectively attached to the strap loop, a pulley component, the cord attached to the pulley component. The pulley component includes a housing, and may include a wheel that rotates within the housing. The wheel may have a circumferential groove or flat circumferential side to accommodate a cord or belt. The cord may form a loop, enabling the cord loop to be secured on the cord-securing component so that the pulley device may be worn on a person's wrist.

Described herein is a hoisting block for a crane. The hoisting block includes an engaging element such as a load hook, to which a lifting tool such as a sling or a hoisting frame can be coupled. The hoisting block is provided with winches, outgoing winch cables of which are configured to carry the lifting tool to the engaging element and couple it to the engaging element. Also described herein is a crane provided with the hoisting block. The hoisting block can be applied for carrying a lifting tool to an engaging element and coupling it to the load-bearing means, or for stabilizing an engaging element relative to a support structure.

Described herein is a hoisting block for a crane. The hoisting block includes an engaging element such as a load hook, to which a lifting tool such as a sling or a hoisting frame can be coupled. The hoisting block is provided with winches, outgoing winch cables of which are configured to carry the lifting tool to the engaging element and couple it to the engaging element. Also described herein is a crane provided with the hoisting block. The hoisting block can be applied for carrying a lifting tool to an engaging element and coupling it to the load-bearing means, or for stabilizing an engaging element relative to a support structure.

A portable winch and method of use is shown. One advantage of winches shown includes an ability to lower a boom or boom sections into limited access exit pit for winching operations such as pipe bursting. Sectional boom designs shown provide the ability to easily raise and lower a boom large distances without the need for a single long boom. Selected winch designs shown include flexible inserts between the boom and the winch frame that help resist damage from unforeseen shifting of the device during operation. Designs and methods shown also include multiple pulleys on a boom end unit. Fasteners are shown that reduce build up of debris.

A portable winch and method of use is shown. One advantage of winches shown includes an ability to lower a boom or boom sections into limited access exit pit for winching operations such as pipe bursting. Sectional boom designs shown provide the ability to easily raise and lower a boom large distances without the need for a single long boom. Selected winch designs shown include flexible inserts between the boom and the winch frame that help resist damage from unforeseen shifting of the device during operation. Designs and methods shown also include multiple pulleys on a boom end unit. Fasteners are shown that reduce build up of debris.