Abstract: A paper-made reel includes an impeller-like winding drum made of paper, and flange plates made of paper attached to one end and the other end of the winding drum, the winding drum includes a hollow shaft portion core, and a plurality of blade portions extending in radial directions from the shaft portion core, the shaft portion core and the blade portions are integrally formed by folding a sheet, the blade portions are formed in a state where the sheet is double-folded, and the winding drum and the flange plates are connected to each other by locking locking pieces formed at both ends of the winding drum to the flange plates.

Abstract: A paper-made reel includes an impeller-like winding drum made of paper, and flange plates made of paper attached to one end and the other end of the winding drum, the winding drum includes a hollow shaft portion core, and a plurality of blade portions extending in radial directions from the shaft portion core, the shaft portion core and the blade portions are integrally formed by folding a sheet, the blade portions are formed in a state where the sheet is double-folded, and the winding drum and the flange plates are connected to each other by locking locking pieces formed at both ends of the winding drum to the flange plates.

Abstract: A main valve body has a first passage, a second passage, and an opening which intersects the first passage and the second passage. A main plug body is rotatably inserted into the opening, and has an upper section into which a handle is inserted, and a lower section having a through-hole. An O-ring is seated on an annular groove which is provided in the vicinity of the through-hole. A seal-retaining member for preventing the O-ring from projecting is fitted to an expanded diameter section of the first passage. One end of the seal-retaining member tightly contacts an end surface of the expanded diameter section. A curved surface corresponding to an inner circumferential surface of the opening is formed at the other end of the seal-retaining member.

Abstract: A main valve body has a first passage, a second passage, and an opening which intersects the first passage and the second passage. A main plug body is rotatably inserted into the opening, and has an upper section into which a handle is inserted, and a lower section having a through-hole. An O-ring is seated on an annular groove which is provided in the vicinity of the through-hole. A seal-retaining member for preventing the O-ring from projecting is fitted to an expanded diameter section of the first passage. One end of the seal-retaining member tightly contacts an end surface of the expanded diameter section. A curved surface corresponding to an inner circumferential surface of the opening is formed at the other end of the seal-retaining member.

Abstract: A pipe joint comprises two tube-end connectors 4, 4 to which the end of a tube 3 is connected, a cylindrical spacer 1 with the tube-end connector 4 fitted to either end, and a pair of metallic housings 6, 6 that each axially covers half the side outer circumference of the spacer 1 and each tube end connector 4, 4.

Abstract: A tube joint for connecting a multi-walled tube assembly, typically a double-walled tube assembly, including a plurality of tubes defining a plurality of fluid passages to an object includes a joint body having a hole for inserting the tube assembly therein and as many passages as the number of the fluid passages. A tube connector mechanism is provided for engaging the tube assembly. A coupling has a rod for being fitted into the tube assembly and a passage for communicating the tube assembly with one of the passages of the joint body. The rod has on a distal end thereof a substantially spherical projection projecting radially outwardly for being fitted in an inner surface of the tube assembly to connect the tube assembly to the coupling. The inner surface of the tube assembly and the rod are slidable with respect to each other to prevent damage to the tube assembly when it is connected to and disconnected from the tube joint.