Search International and National Patent Collections

1. (WO2018179207) HYDRAULIC SHOCK ABSORBER FOR ELEVATORS

Pub. No.:    WO/2018/179207    International Application No.:    PCT/JP2017/013229
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 31 01:59:59 CEST 2017
IPC: B66B 5/28
F16F 9/19
F16F 9/32
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: MIZUNO, Kosuke
水野 功介
KAJITA, Akinari
梶田 昭成
Title: HYDRAULIC SHOCK ABSORBER FOR ELEVATORS
Abstract:
The purpose of the present invention is to provide a hydraulic shock absorber capable of operating without oil spilling out onto the exterior surface of the hydraulic shock absorber or the elevator pit without providing an air chamber within a piston. This hydraulic shock absorber for elevators comprises: a cylinder in which an oil chamber is formed, with a pin rod erected on the bottom surface thereof, and into which hydraulic oil is injected; a vertically reciprocating piston which is inserted into the oil chamber; a piston head which is formed at the distal end of the piston and has an outside diameter larger than the outside diameter of the piston; an opening which is formed in the piston head so as to allow passage of the pin rod; a hollow portion which is formed inside the piston and into which hydraulic oil flows, through the opening, during operation; first through-holes which are formed in the side of the piston; a hollow air reservoir portion which is formed above the oil chamber; second through-holes which are formed in the side of the piston; and third through-holes which are formed in the cylinder. When the piston is lowered, the first through-holes are disposed inside the air reservoir portion in an exposed state.