摘要:
A diagonal elevation apparatus comprises a frame fitted to a sloped surface connecting the floor surface of a lower floor to the floor surface of an upper floor, a platform and a counterweight. The platform is disposed inside the frame and has first guide rollers guided by first guide rails, and a platform gate on a step surface. The counter-weight is equipped with second guide rollers and has second guide rails for the second guide rollers. The second guide rails are disposed inside the first guide rails. The platform and the counter-weight are connected to each other by divided plain belts through pulleys disposed at the upper and lower ends of the frame at the front and back of the platform and the counter-weight. The diagonal elevation apparatus further comprises means for moving the platform, comprising a linear motor fixed inside the frame and a brake device, or a variable speed motor equipped with a reduction gear.
摘要:
An optical resin material comprising a polymer containing as an essential component at least one norbornyl acrylate or methacrylate or a derivative thereof is excellent in properties, particularly in moisture resistance and can be used for molding optical elements such as lenses, optical discs, etc.
摘要:
Expandable particles of a styrene polymer which comprise on the surface thereof an ester of an aliphatic carboxylic acid with an aliphatic alcohol, the ester having no hydroxyl group in the molecule and being a solid at room temperature, or a mixture of said ester and a finely divided lubricant, and a process for preparing the same.