摘要:
A zero fleet winch with guides that move while a cable is wound on a drum. The guides hold the cable always at 90 degrees to the drum. A tensioning turnaround sheave keeps the cable tight.
摘要:
Stage usable device, such as a moving light, is held on a platform that is raised and lowered by a winch connected to a truss. The winch can be connected inside the truss, outside the truss such as above or below the truss, or in corner blocks of the truss.
摘要:
A truss hinge that includes a number of different labeled parts, where connections between the two different parts can constrain the truss to different angles.
摘要:
A zipper style lift that coils into a box for storage, but extends to form a rigid, self erecting lift part. The lift stores itself in a housing when retracted, by retracting chain parts into a spiral form.
摘要:
A crossbow having an improved firing assembly. The improved assembly attaches to a bowstring at a single point and draws the string back to have the string retained between a first string retainer and a second string retainer. By allowing the string to be drawn utilizing a single contact point on the bowstring as opposed to the prior art methods of dual engagement points with the bowstring, the cost, maintenance and undesired variance in string retention associated with the prior art are substantially eliminated.
摘要:
Cryptographically Protected Prefixes (“CPPs”) are used to create IP addresses, preventing any correlation between a CPP IP address and a host's geographic location. An IP address is subdivided into address prefixes of multiple segments. Each segment is encrypted with a cryptographic key known only to a subset of routers in the access network domain (or Privacy Domain). Therefore, each router obtains the information it needs to forward a packet of information, but not any additional information.
摘要:
In a network of object oriented distributed systems, a plurality of program code managers, each having access to a plurality of program code segment objects, a plurality of address space managers, each having access to a plurality of address space objects having linked program segment and symbol address information, and a plurality of trusted third party authentication managers are provided, thereby allowing a client process executing in non-supervisor mode to be able to dynamically link a program segment to either another program segment in another address space or a process in either another address space or the client's address space, without compromising the security of the systems.
摘要:
A hoist pick up bar, which has its entire clamp system inside the footprint of the truss. A benefit of placing the hoist inside the truss allows designers to raise the truss structure itself higher since the hoist is no longer above it. In embodiments, the device has clamps that move out of the way so that the device can be lowered on to the truss.