Abstract: A wheeled dolly that can be readily removed from and attached to a portable shelter in an upright position by a single person. One person may use the wheeled dolly to easily lift and transport the portable shelter, wherein the portable shelter may be a canopy, tent, pavilion, awning, or the like. The dolly may comprise a pair of wheels selectively connected by an axle beam, and a pair of mounting elements having first portions and second portions and extending laterally outward from the third segment of the axle beam, wherein the mounting elements are operably configured to be selectively and securely inserted into a pair of receiver holes located on the portable shelter.

Abstract: A wheeled dolly that can be readily removed from and attached to a portable shelter in an upright position by a single person. One person may use the wheeled dolly to easily lift and transport the portable shelter, wherein the portable shelter may be a canopy, tent, pavilion, awning, or the like. The dolly may comprise a pair of wheels selectively connected by an axle beam, and a pair of mounting elements having first portions and second portions and extending laterally outward from the third segment of the axle beam, wherein the mounting elements are operably configured to be selectively and securely inserted into a pair of receiver holes located on the portable shelter.

Abstract: An improved pin assembly for forming at least one pin joint in an object. The pin assembly may be readily inserted into and removed from more than one object when forming a pin joint, without the need for any special tools or equipment. The pin assembly comprises an unthreaded, self-locking pin comprising a first end and a second end; an elongated shaft; a hole intersecting the shaft; and a fin slidably disposed in the hole. The self-locking pin is configured to be readily inserted into and readily removed from an object, wherein the object comprises at least one first aperture on at least one first space frame member and at least on second aperture on at least one second space frame member. The fin is in its extended position after the self-locking pin is inserted through both the first space frame member and the second space frame member.

Abstract: A ball relief feature for a ball screw allows multiple turn ball circuits with reduced ball bearing stack-up within the ball screw assembly. Reliving bearing stack up allows for ball circuits having more turns without reducing the number of load carrying ball bearings of a typical ball nut. The ball relief feature reduces ball bearing stack-up by allowing the balls to re-distribute relative to one another and space themselves evenly in oversized portions of the ball circuit track other than the ball return mechanism.

Abstract: This invention relates to an end cap return for a ball screw. The end cap uses tangential force from the sidewalls of the ball passage to roll the ball bearings sideways out of the leadscrew raceway rather than the typical protruding finger that picks the balls up directly. The end cap allows it to be advantageously fabricated with using additive manufacturing, making the end cap cost effective for use in custom ball screw assemblies. In some embodiments, the end cap may include an insert for certain portions of the end cap that can be easily and inexpensively replaced should the insert become worn.