3results about How to "Heavy weight" patented technology

The tower crane cab without the framework structure comprises an underframe, side plates, a front plate, a rear plate and a top plate, each side plate is formed by stacking an inner side plate and an outer side plate, and a hollow section structure is arranged in each side plate; the front plate comprises a plurality of beam-shaped plates which are distributed at intervals in the longitudinal direction; the beam-shaped plate is formed by stacking an inner beam plate and an outer beam plate, and a hollow section structure is arranged in the beam-shaped plate; the rear plate comprises a wall plate and a door plate which can be opened and closed relative to the wall plate; the wall plate is formed by stacking a rear inner plate and a rear outer plate, the interior of the wall plate is of a hollow section structure, and the top end, the bottom end, the left end and the right end of the wall plate are each of a double-layer plate structure formed by stacking and welding the rear inner plate and the rear outer plate. The top plate comprises an outer top plate and a beam-shaped inner top plate which are stacked and welded, and a hollow section structure is arranged in the top plate. According to the tower crane driver without the framework structure, lightweight design is achieved, and the advantage of being low in manufacturing cost is achieved. Correspondingly, the invention further provides the tower crane adopting the frameless cab.

Provided is a sealant composition that can ensure good sealing properties while suppressing a flow of a sealant during travel and that can provide such performance in a well-balanced, compatible manner. As a sealant composition constituting a sealant layer (10) disposed in an inner surface of a pneumatic tire, a sealant composition in which a proportion (A) of toluene insoluble occupying the sealant composition is from 30 mass% to 60 mass% is used, or a sealant composition in which a ratio (d1 / d2) of measured specific gravity (d1) of the sealant composition measured by an underwater replacement method to calculated specific gravity (d2) of the sealant composition calculated from specific gravity and a blended amount of each raw material in the sealant composition is from 0.7 to 0.9 is used.