Patent ID: 9345630
Filing Date: 2016-05-24
CPC Classification: A61G,F16F

Claim Text:
1. An upper frame position holding structure used for an ambulance vibration-proof rack having a stretcher-supporting upper frame which is attached to a base frame via a link mechanism including a front link mechanism located on a front side and a rear link mechanism located on a rear side, is swingable along a trajectory of movement of a four-bar linkage by the link mechanism including the front link mechanism and the rear link mechanism, and has a position where a substantially horizontal posture is taken in the trajectory of movement, while, at other positions, taking an inclined posture with a front side being located higher than a rear side, the upper frame position holding structure comprising at least one of a front link mechanism control means and a rear link mechanism control means, wherein, irrespective of a position of the upper frame in the trajectory of movement, the link mechanism including the front link mechanism and the rear link mechanism is locked in a state where the upper frame is displaced to the substantially horizontal posture, wherein the front link mechanism control means includes an operation member which, when given an external force, brings the upper frame into the substantially horizontal position by displacing the upper frame rearward while lowering the front side of the upper frame, and locks the front link mechanism in the state where the upper frame is brought into the substantially horizontal posture, to hold the upper frame in the substantially horizontal posture, and wherein the rear link mechanism control means includes an operation member which, when given an external force, brings the upper frame into the substantially horizontal posture by displacing the upper frame rearward while raising the rear side of the upper frame, and locks the rear link mechanism in the state where the upper frame is brought into the substantially horizontal posture, to hold the upper frame in the substantially horizontal posture.