Abstract: An apparatus comprises frame plates, lever arms, a linkage assembly, bridge arms, upper pad assemblies, and lower pad assemblies. The lever arms are operative to pivot relative to the frame plates. The linkage assembly is pivotally coupled to the frame plates and to the lever arms. The bridge arms are pivotally coupled to the lever arms. The upper pad assemblies are pivotally coupled to the bridge arms. Lastly, the lower pad assemblies are pivotally coupled to the frame plates. Pivoting the lever arms in a first direction translates the upper pad assemblies towards the lower pad assemblies, and pivoting the lever arms in a second direction translates the upper pad assemblies away from the lower pad assemblies. Actuation of the linkage assembly is operative to cause the lever arms to pivot.

Abstract: Aspects of the invention are directed to an apparatus that may be used as a chain tensioner. The apparatus comprises a release handle, which is limited in motion by an elongate member that rides in a shaped guide slot. As a result of this configuration, two distinct forces must be applied to the release handle before a chain is released from the apparatus. Such a configuration reduces the chances of inadvertent releases of a chain.

Abstract: Aspects of the invention are directed to an apparatus that may be used as a chain tensioner. The apparatus comprises an attachment element, such as a hook, that is rotatably coupled to a locking plate. In use, the apparatus is operative to take on a plurality of locked states and an unlocked state. Each of the plurality of locked states is characterized by the locking plate being pressed into a cavity of a locking body in a manner that prevents the locking body, and, by extension, the attachment element from rotating. The unlocked state is characterized by the locking plate being outside the cavity, and thereby free to rotate. The attachment element is therefore capable of being swiveled between, and locked into, multiple orientations.

Abstract: Aspects of the invention are directed to a fastening device. A housing comprises a substantially planar coupling plate defining an aperture. A first engagement member passes through the aperture and defines a first arcuate surface with a first outwardly extending foot at a proximal end and a first protruding rim at a distal end. A second member is largely a mirror image of the first engagement member. A slide is adapted to be translated between a first position and a second position. When the slide is in the first position, the slide occupies a space between the first and second engagement members so that they are fixedly spaced apart. When the slide is in the second position, the first engagement member and the second engagement member are free to limitedly pivot in the housing to a condition in which the distal ends of the two engagement members meet.

Abstract: Aspects of the invention are directed to a fastening device. A housing comprises a substantially planar coupling plate defining an aperture. A first engagement member passes through the aperture and defines a first arcuate surface with a first outwardly extending foot at a proximal end and a first protruding rim at a distal end. A second member is largely a mirror image of the first engagement member. A slide is adapted to be translated between a first position and a second position. When the slide is in the first position, the slide occupies a space between the first and second engagement members so that they are fixedly spaced apart. When the slide is in the second position, the first engagement member and the second engagement member are free to limitedly pivot in the housing to a condition in which the distal ends of the two engagement members meet.

Abstract: In the absence of centrifugal force produced during rotation of helicopter blades, damage may result if a blade is rotated upward by wind or other forces. Lock units removably appended between the rotor assembly and each blade pitch housing attached to a helicopter blade are usable to restrict upward rotation. A base portion of a lock unit may be configured to be held in position by a removable pin device. An extendible device extending from the base portion to a surface of a blade pitch housing can be adjusted to press the base portion back against a surface of the rotor assembly. The lock unit thereby restricts these surfaces of the blade pitch housing and rotor assembly from moving closer to each other and thereby restricts upward rotation of the blade pitch housing and its attached helicopter blade. The lock units are readily removable in preparation for returning a helicopter to active use.

Abstract: Blade fold hinge units are attachable between each helicopter blade and its hub attachment point, while maintaining continuity of mechanical connection of each blade to its hub portion. A two portion hinge unit has a first portion for blade attachment and a second portion for hub attachment. The first and second portions are hinged via a transverse pin to enable blade drooping downward, before or after a blade is pivoted to an aft position for helicopter storage or shipment. Upon aft pivoting of a blade, undesired further pivoting or knuckling of the hinge unit relative to the hub is prevented by addition of a lock link. After blade folding, the blades may be suitably fixed in position adjacent the aft portion of the helicopter body.

Abstract: Angled warp spikes enable secure attachment to the steel flooring of a railroad boxcar. Such flooring includes transverse slots with a curved depth profile. The warp spikes are designed to deform or warp as they are driven into a flooring slot and conform to the curved depth profile. Tiedown fixtures fabricated of steel plate can be attached to the floor of a boxcar by warp spikes driven through elongated openings in the fixture into slots in the boxcar flooring. Tiedown fixtures used with warp spikes provide a boxcar tiedown system to which tiedown load carrying members, such as cables, chains, braces and struts can be connected.