Series 21 Spring Arm Lift Mechanism

A steel mounting plate with a lift arm and a bank of extension springs that balance the weight of a wall bed on one side board.

Details

Category: Beds › Single-Level Beds › Bed Lift Mechanisms

By Huu Khanh Nguyen · Updated November 9, 2026

Parameters

Name	Default	Unit
Bed Angle	0	°
Springs Per Mechanism	7
Arm Rest Angle	74.7	°
Link Pivot X	-71.5	mm
Link Pivot Z	0.86	mm
Tension Arm Shift X	jointX * (Math.cos((armRest + angle) * Math.PI / 180) - 1) + jointZ * Math.sin((armRest + angle) * Math.PI / 180)	mm
Tension Arm Shift Z	jointZ * (Math.cos((armRest + angle) * Math.PI / 180) - 1) - jointX * Math.sin((armRest + angle) * Math.PI / 180)	mm
Width	498.2213988673907	mm
Depth	23	mm
Height	374.7923877630395	mm