Patent ID: 6952349

Claim:
A modular assembly for housing an electronic circuit, comprising a supporting structure having vertically extending guides, and at least one circuit module engageable with the guides for movement in a vertical direction between a mounted position and a dismounted position, the assembly further comprising a motion control device having a first component provided on the module and a second component provided on the supporting structure, and wherein the first and second components of the motion control device are cooperable when the module is between the mounted and dismounted positions to apply a force to the module at least equal to the weight of the module to resist downward movement of the module relative to the supporting structure in engagement with the guides under its own weight, and to permit downward movement of the module when a downward force additional to the weight of the module is applied thereto, wherein one of the first and second components is an elongated engagement surface, and the other of the second and first components comprises a rotatable element engageable with the engagement surface for rolling movement therealong, and includes a retarding device for generating resistance to rotary movement of the rotatable element in at least one rotation direction.