An assembly comprising a drive gear coupled to a shaft and a dial. The drive gear is configured to rotate along a first axis based on movement of the dial. The assembly includes a first linking member located along a second axis and configured to rotate about the second axis based on contact with the drive gear as the drive gear is rotated. The assembly includes a second linking member located along the second axis and configured to rotate about the second axis based on rotation of the drive gear and a coupling between the first linking member and the second linking member. The assembly includes a linking member selector configured to rotate about the first axis and for selecting at least a position corresponding to the first linking member that causes the coupling between the first linking member and the second linking member.

The multiple small pitch helical drives in linear and rotary actuators uses a plurality of small pitch helical screws in place of a single large pitch lead screw to provide increased power or force in a linear actuator or increased torque in a rotary actuator. The multiple small pitch helical drive includes a plurality of screws disposed between a base panel and a rear panel in a rigid skeleton, the screws having a single degree of freedom, i.e., they are free to rotate, but cannot move axially. A piston head having spaced disks includes floating nuts disposed in sockets on the disks for each of the screws, the piston head being free to travel on the screws between the base panel and the rear panel as the screws are rotated. The helical pitch reduction provided results in increased force output and increased torque for linear and rotary actuators.

A multiple-antenna positioning system with a single drive element, providing reduced weight and complexity over systems that have a drive element for each antenna. In certain examples, each antenna can be coupled with a rotating spindle, with each antenna spindle being coupled with a pair of link arms. By driving a single drive spindle, each of the antenna spindles in the system can be rotated by the associated pair of link arms. The link arms can have an adjustable length, such as through a turnbuckle mechanism, to reduce backlash in the system, and in some examples can apply a preload to the system. By reducing backlash, the multiple antenna positioning system can have improved responsiveness to a rotation of the single drive element, as well as improved stability of the positioning of each antenna when the drive element is held in a fixed position.

A device comprising a main support an equipment support having a first position and a second position adjustable relative to the height of the main support. A first crank lever is mounted to the first bearing and rotatable about a first rotational axis via a first shaft. A connecting rod is connected to the first crank lever via a first joint and to the equipment support via a second joint. A guide is arranged such that the equipment support is displaceable while guided to remain parallel to the main support. The equipment support passes an upper dead center position when moving from a first to a second position by rotation of the first crank lever and, upon further rotation a stop element contacts a stop.

A device comprising a main support an equipment support having a first position and a second position adjustable relative to the height of the main support. A first crank lever is mounted to the first bearing and rotatable about a first rotational axis via a first shaft. A connecting rod is connected to the first crank lever via a first joint and to the equipment support via a second joint. A guide is arranged such that the equipment support is displaceable while guided to remain parallel to the main support. The equipment support passes an upper dead center position when moving from a first to a second position by rotation of the first crank lever and, upon further rotation a stop element contacts a stop.

In order to solve low strength and labor-saving of transmission mechanism of conventional crank assembly for a bicycle, this invention provides a crank device. The crank device of this invention includes: a housing (3) to be connected to a frame of the bicycle; a transmission member (4) accommodated in the housing (3) in a loose-fit manner; a supporting shaft (5) partially accommodated in the transmission member (4) in a loose-fit manner; and two driving assemblies (8, 9). Each of the driving assemblies (8, 9) includes: a driving member (82, 92) secured to transmission member (4) and to be connected to a sprocket of the bicycle, wherein one end of the supporting shaft (5) passes through the transmission member (4) and the driving member (82, 92) in a loose-fit manner; and a force arm (81, 91) including an ear (811) secured to the driving member (82, 92) and a bump (812) pivoted to the one end of the supporting shaft (5). This invention allows the crank device to transmit a large force and enhance labor-saving effect.

In order to solve low strength and labor-saving of transmission mechanism of conventional crank assembly for a bicycle, this invention provides a crank device. The crank device of this invention includes: a housing (3) to be connected to a frame of the bicycle; a transmission member (4) accommodated in the housing (3) in a loose-fit manner; a supporting shaft (5) partially accommodated in the transmission member (4) in a loose-fit manner; and two driving assemblies (8, 9). Each of the driving assemblies (8, 9) includes: a driving member (82, 92) secured to transmission member (4) and to be connected to a sprocket of the bicycle, wherein one end of the supporting shaft (5) passes through the transmission member (4) and the driving member (82, 92) in a loose-fit manner; and a force arm (81, 91) including an ear (811) secured to the driving member (82, 92) and a bump (812) pivoted to the one end of the supporting shaft (5). This invention allows the crank device to transmit a large force and enhance labor-saving effect.

An embodiment of the present invention achieves a reduction in size of a movable structure for a device. A right link (6) is fixed to a rotary shaft (51) of a right motor (5). The right link (6) has a tip (61) which can slide in a sliding region (31). A portion of the tip (61) which can make contact with a connecting part (3) has a spherical shape. A left link (8) is fixed to a rotary shaft (71) of a left motor (7). The left link (8) has a tip (81) which can slide in a sliding region (32). A portion of the tip (81) which can make contact with the connecting part (3) has a spherical shape.

An embodiment of the present invention achieves a reduction in size of a movable structure for a device. A right link (6) is fixed to a rotary shaft (51) of a right motor (5). The right link (6) has a tip (61) which can slide in a sliding region (31). A portion of the tip (61) which can make contact with a connecting part (3) has a spherical shape. A left link (8) is fixed to a rotary shaft (71) of a left motor (7). The left link (8) has a tip (81) which can slide in a sliding region (32). A portion of the tip (81) which can make contact with the connecting part (3) has a spherical shape.

A multiple-antenna positioning system with a single drive element, providing reduced weight and complexity over systems that have a drive element for each antenna. In certain examples, each antenna can be coupled with a rotating spindle, with each antenna spindle being coupled with a pair of link arms. By driving a single drive spindle, each of the antenna spindles in the system can be rotated by the associated pair of link arms. The link arms can have an adjustable length, such as through a turnbuckle mechanism, to reduce backlash in the system, and in some examples can apply a preload to the system. By reducing backlash, the multiple antenna positioning system can have improved responsiveness to a rotation of the single drive element, as well as improved stability of the positioning of each antenna when the drive element is held in a fixed position.