PURPOSE:To provide a liquid crystal compsn which makes time division driving possible at a low voltage, consisting of the first liquid crystal (in which anisotropy of dielectric constant is negative), the second liquid crystal (in which said anisotropy is positive), and the third liquid crystal contg a specified liquid crystal compd exhibiting less temperature dependence of threshold voltage CONSTITUTION:The first liquid crystal (A) (which contains at least one compd of formula I wherein R1, R2 are each straight-chain alkyl and in which anisotropy of dielectric constant is negative), the second liquid crystal (B) (which consists of at least one compd of formula II, at least one compd of formula III and at least one compd of formula IV wherein R3, R4, R5 are each straight-chain alkyl and in which anisotropy of dielectric constant is positive), and the third liquid crystal (C) (which contains at least one compd of formula V wherein R6, R7 are each straight-chain alkyl), are mixed together to obtain a nematic liquid crystal compsn for an electric field effect type liquid crystal display apparatus which is applied watches, electronic calculators, etc This liquid crystal compsn makes time division driving possible at 3V or lower, exhibits excellent voltage margin, and further has excellent chemical stability, resistance to freeze at low temperature, etc

Liquid crystal composition

PURPOSE:To improve the workability, by mounting a plastic grill frame having a groove to a jig applied with high frequency heating, folding and inserting an end of a metallic net, melting the inside of the groove with welding through high frequency heating and welding the plastic and the metal. CONSTITUTION:The jig 2 having a high frequency induction heating coil 1 is mounted on a surface plate 3 and the plastic grill frame 4 is fitted to a prescribed position. The grill frame 4 has the groove 6 and a ridge 7 bending the end of the metallic net 5 is inserted into the groove 6. Then, a high frequency current flows to the coil 1 to heat up rapidly the bent ridge 7, which is pressed with a press plate 9 of a press machine 8 so as to protrude the bent ridge 7 of the metallic next to the lastic grill frame 4 and hardened with cooling. Thus, the workability and the yield are improved.

Method for fitting a metallic grill to plastic grill frame mounted on front surface of sound equipment

PURPOSE:To prevent a fitting leg from becoming loose by inserting and bending the fitting leg of a metallic net into penetration holes provided around the speaker sound discharging hole part of a cabinet and welding a rib piece provided at the inner surface side of the cabinet onto the fitting leg. CONSTITUTION:A metallic net main body 1 is inserted into the recessed groove 5 of the cabinet 3 made of synthetic resin in which the bending part 1a of an outer circumference has a speaker sound discharging hole part 4, a fitting leg 2 is inserted into the penetration holes 6 of the cabinet 3 and fitted at the cabinet 3 so as to cover the speaker sound discharging hole part 4. The fitting legs are respectively bent between a pair of rib pieces 7 and 7 protruded at the inner surface side of the cabinet 3 and the rib piece 7 is fitted to the cabinet 3 by melting it on the bent fitting leg 2. Thus, the loosing of the fitting leg 2 of the metallic net main body 1 can be effectively prevented.

Net fitting method

PROBLEM TO BE SOLVED: To provide a movement preventing device for a fluid pipe, capable of suppressing variance in the moving margin of a slip-off preventing member and stably exerting an effect of preventing movement of a fluid pipe.SOLUTION: The movement preventing device includes: a slip-off preventing member 6 having a pawl 8 that can bite the outer peripheral surface 2a of a water pipe P; an annular housing 7 for housing the slip-off preventing member 6 in a housing groove 9; an elastic member 11 attached to the first side face 61 of the slip-off preventing member 6, the side face facing a movement direction of the water pipe P; and a holding member 12 attached to the side face of the slip-off preventing member 6, the side face facing in an opposite direction to the first side face 61. In the process from an initial state to such a set state that the pawl 8 of the slip-off preventing member 6 is locked to the outer peripheral surface 2a, a gap D between the first side face 61 and an inner face 91 opposing thereto is held via the elastic member 11 while the holding member 12 is in contact with an inner wall face 92 opposing to the second side face.

Movement preventing device for fluid pipe

Device for preventing breakage of pipe in pipe joint

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Device for preventing breakage of pipe in pipe joint