Nippo Sangyo Co., Ltd.

Irie Koken Kabushiki Kaisha

Toshio Sawa

Yuzo Hayashi

Norikimi Irie

Atsushi Kasahara

Hironari Abe

Toshiro Katagiri

Yuya Abe

The object of the present invention is to provide a road surface roughness measuring apparatus for measuring the coefficient of dynamic friction and the roughness of the road surface in each direction at a same section where the coefficient of dynamic friction is measured, said apparatus divides the measuring circle on the road surface into a plurality of sections, on which measuring circle the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction. The road surface roughness measuring apparatus has: a frame ( ) having a plurality of legs ( ) used for placing the apparatus on a road surface (G); a rotary shaft ( ) mounted on the frame ( ) and extending vertically; a rotary encoder ( ) mounted on the top end of the rotary shaft ( ); a rotation plate ( ) mounted on the bottom end of the rotary shaft ( ); a motor ( ) provided with a speed reducing gear and for driving the rotary shaft via gears ( ); and a laser displacement gauge ( ) mounted on the rotation plate ( ). The laser displacement gauge ( ) is disposed in such a way as to measure a road surface roughness along a measuring circle (P) on which the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction by the rotation of the rotation plate. The measuring circle (P) is divided into a plurality of sections and the road surface roughness for each section (a to h) is calculated based on the signals of the laser displacement gauge ( ) and the rotary encoder ( ).

Road surface roughness measuring device

Valve body for non-sliding type gate valve

A non-sliding vacuum gate valve comprising a valve housing hermetically sealed to the outside, an opening formed in one of its side walls, and a valve body disposed within the valve housing and adapted to sealingly open or close the valve seat formed around the opening in which the mechanism for opening and closing the valve body sealingly open or close the valve seat is provided outside the valve housing, the mechanism being made to be able to carry out two subsequent movements, one to move the valve body in a direction substantially perpendicular to the valve seat, the other to move the valve body substantially orthogonal to a direction substantially perpendicular to the valve seat with the valve body being spaced apart from the valve.

Non-sliding gate valve for high vacuum use

A dynamic friction coefficient measuring apparatus includes a friction measuring portion having a disc with a friction measuring rubber member attached thereto, a driving disc adapted to rotate coaxially with the disc and a dynamometer which interconnects the disc and the driving disc. A tachometer measures the speed of the rubber member during rotation of the friction measuring portion. An X-Y recorder records two electric outputs of the friction measuring portion and the tachometer onto rectangular coordinates.

Dynamic friction coefficient measuring apparatus

Growing community of inventors

Sayama, Japan

Toshio Sawa