A hand crank for a landing gear is described, the hand crank having a main body provided at a first end with a connecting element for fastening the hand crank to an input shaft of the landing gear and formed at an opposite, second end to rotate the hand crank. The hand crank only allows torque to be transmitted from the hand crank to the input shaft if the operator holds the hand crank with at least one hand. A clutch is arranged in the force flow between the first end of the main body and the connecting element, wherein the clutch is held in an open disconnected position and is moved into a force-locked connection position by operating an actuating element arranged at the second end.

A crank assembly with an adjustable handle assembly that includes a handle mounted on bearings and on an axle such as a self-locking, quick-release pin. The pin allows the handle assembly to be removably positioned in any of a number of holes in the crank body allowing choice of high leverage or high speed during crank operation. While designed with hand-cranked trailer jacks in mind, the crank assembly can be used in various applications requiring hand cranking by suitable choice of crank interface and dimensions. An adapter at the crank interface may be used alone with a power drive tool or by hand with the crank assembly.

In combination with a crank assembly, the improvement comprising an apparatus for improving operation of the crank assembly. The apparatus includes an an end cap of a predetermined material, an elongated extension member having each of a predetermined shape, a first predetermined length and formed of a first predetermined material, such predetermined shape includes a projection on one end thereof for engagement with one end of the crank assembly. A sleeve is disposed around at least a portion of the elongated extension member, such sleeve having a second predetermined length and formed of a second predetermined material. There is a means for securing the sleeve to the elongated handle member.

Various implementations include a handle attachment device. The device includes a body and a drive shaft. The body has a first portion and a second portion. Each of the first portion and second portion defines at least one fastener opening. Each of the at least one fastener opening defined by the first portion is alignable with one of the at least one fastener opening defined by the second portion. The first portion and the second portion are clampable on a crank when the device is in a mounted position. The crank has a crank rotational axis.

Various implementations include a handle attachment device. The device includes a body and a drive shaft. The body has a first portion and a second portion. Each of the first portion and second portion defines at least one fastener opening. Each of the at least one fastener opening defined by the first portion is alignable with one of the at least one fastener opening defined by the second portion. The first portion and the second portion are clampable on a crank when the device is in a mounted position. The crank has a crank rotational axis.

A rotary high lifter and controlled descender has a main housing enclosing a ratchet spool, controlled descender, and locking pawl. An adjustable crank turns the ratchet spool and takes up rope which raises an attached feeder, nestbox, etc. The locking pawl assures that as the rope is wound, the lifter/descender automatically locks in place so that an inadvertent crank release of the crank does not cause the feeder to fall. The rope exits the main housing via an inlet nipple which protects the housing from the elements, insects, etc. To lower the feeder, actuate a cam lock to release the locking pawl, and turn the crank in the opposite direction. Releasing the cam lock can actuate a controlled descender portion of the invention. These components apply a brake-pad-like action against the ratchet spool (can also use a tension knob) to control the speed of rotation and descent.

Provided are systems and methods for adjusting an armrest assembly, the assembly comprising an armrest that includes an armrest pad, a rising platform having a nut aperture, a nut positioned within the nut aperture. The assembly further includes a rod assembly coupled with the armrest, an adjustment mechanism for raising or lowering the armrest, and may include one or more rotation stops coupled with a stationary plate.

A feeder for pigs includes a hopper and a trough for receiving the feed where an elongate opening is defined by an elongate shelf to control the amount of feed discharged from the hopper to the trough. An adjustment linkage for lifting the shelf against the weight of feed in the hopper includes a first lift screw and a second lift screw each for applying a lifting force to the elongate adjustment member located at spaced positions from the end walls of the hopper. Each of the screws includes a gear box with a shaft connected between the two gear boxes to communicate drive therebetween for simultaneous operation of the lift screws by a hand crank connected to one at the top of the feed in the hopper.

Various implementations include a handle attachment device. The device includes a body and a drive shaft. The body has a first portion and a second portion. Each of the first portion and second portion defines at least one fastener opening. Each of the at least one fastener opening defined by the first portion is alignable with one of the at least one fastener opening defined by the second portion. The first portion and the second portion are clampable on a crank when the device is in a mounted position. The crank has a crank rotational axis.

Maneuver element of the type composed by an element provided, on each end, with a protruding grip and centrally with safety means which can be activated under pressure and controlled from outside, apt to engage the structure on which it is mounted and to prevent the rotation, said pressure activated means, being composed of a button system having a central hole, housed within a depression of said maneuver element, and partially protruding from it, from the base of said button system abutting engaging and retaining plugs, housed free to move longitudinally within the holes obtained in said maneuver element, characterized in that fast remote identification means of the functionality of said maneuver and pressure fast activation means of said engaging and retaining plugs are associated with said button system, said pressure fast activation means of said plugs being composed by the association of engaging elements mounted on a rotor with driving and retaining elements provided on a stator complementary to said rotor.