Disclosed herein are methods, systems, and components for the design of a flat belt based block and tackle design that is theoretically free of fleet angles. A mapping technique forms a set of planar positions for the centerlines of the free spans that provides a plurality of sheave geometries, which reside on a common axis and spans that are free of fleet angles at the sheave engagement interfaces. This permits the use of high-performing flat belts in high-reduction block and tackle topologies, with the principal benefits of an extended service life, high power transmission efficiency, more effective traction power transfer, and a compact machine design.

The extension-retraction device according to the present disclosure is an extension-retraction device in which a first belt and a second belt wound around the outside of the first belt are spirally wound around a tubular structure. The second belt includes an engaging pin having a fitting portion that fits into a hole of the first belt and an insertion portion that protrudes from the fitting portion and is inserted into the hole of the first belt. The fitting portion has a cylindrical shape having a diameter corresponding to the hole of the first belt, and the side surface of the insertion portion is inclined so that the diameter of the insertion portion decreases toward the tip portion.

A cable-operated mechanism for actuating a slide-out room includes a column, an endless chain loop disposed with the column, first and second drive blocks engaged with the chain loop, and first through fourth cables attached at first ends thereof to the drive blocks. The cables are attached at second ends thereof to inboard and outboard ends of a slide out room. Operation of the chain loop in a first direction tensions the cables attached to the inboard end of the room and slackens the cables attached to the outboard end. Operation of the chain loop in a second direction has the opposite effect.

The present invention relates to a linear actuator comprised of a tube and method of deploying 3 spools of strips into a tube by consolidating the strips in an overlapping condition with each other each in a helical form of a constant diameter.

A portable radar system comprising: a base; a mount connected to the base; a radar antenna pivotally attached to the mount; and a linear actuator pivotally connected between a portion of the base and the radar antenna, the linear actuator comprising a base containing an extendable column, which when deployed is substantially cylindrical, having a corrugated outer wall, and which is configured to raise and lower the radar antenna.

A telescopic device includes an expandable tubular structure and an inner-side guide member disposed inside the tubular structure. The tubular structure includes an outer belt and an inner belt. The outer belt and the inner belt each have a plurality of first protrusions and holes arranged in a row in the longitudinal direction. The inner-side guide member has a first spiral groove extending along the plurality of first protrusions. When the inner-side guide member rotates in one direction, the outer belt and the inner belt are sent out, so that they are spirally wound while being engaged with each other, and the tubular structure extends. The first spiral groove has a body and an end portion extending from the body toward the root of the inner-side guide member. The distance between the end portion of the first spiral groove and the main part of the first spiral groove is small.

Rotary-to-linear transmission systems are disclosed comprising a support, at least one pulley coupled to the support, a rotor having an axis of rotation, a carriage, at least one pulley coupled to the carriage, and at least one piece of flexible material coupled to the rotor, wound around the rotor, wrapped around at least one pulley coupled to the carriage, wrapped around at least one pulley coupled to the support, and wound around the rotor again.

An actuator device comprises a compact housing including an extendable corrugated column comprising: a horizontal helical band; a vertical sidewall band having a plurality of hinged segments; and a resilient retaining band; wherein the hinged segmented vertical band includes a first group of segments having tabs defined at longitudinal ends of the first group of segments, the tabs configured to overlap and engage an outer edge of the horizontal helical band, and a second set of segments positioned between adjacent tabbed segments of the first group of segments, the second set of segments configured to define corrugations between adjacent tabbed segments in the first group of segments.

The spiral advance/retreat actuation device includes a first strip material, a second strip material, an inner guide member as a strip material guide unit, an outer cylindrical wall, and a strip material storage container. The strip material storage container includes a first storage chamber that spirally stores a first strip material that has transitioned from a cylindrical configuration state to a separated state, and a second storage chamber that spirally stores a second strip material that has transitioned from a cylindrical configuration state to a separated state. The inner bottom surface of the first storage chamber and the inner bottom surface of the second storage chamber are sloped so as to descend as they move away from the axis.

The present disclosure provides differential drive assemblies and methods of making and operating differential drive assemblies. The differential drive assembly includes a rotor having a rotor axis about which the rotor is configured to rotate. The rotor has a peripheral wall portion encircling the rotor axis that is positioned a varying distance radially outward from the rotor axis. The differential drive assembly also includes a base coupled to the rotor. That includes a first plurality of pulleys and a carriage movably coupled to the base that includes a second plurality of pulleys and is movable with respect to the base. The differential drive assembly includes a rope wound about the rotor. The rope extends from the peripheral wall portion of the rotor to the second plurality of pulleys. The rope extends from the second plurality of pulleys to the first plurality of pulleys to form a continuous rope circuit.