Patent ID: 6176456
Filing Date: 2001-01-23
Classification: A47B,Y10S

Abstract:
A mechanism for mounting a support for an art device for vertical swinging movement relative to a base comprising: a mounting member adapted for connection to said base; a three bar linkage having a first end adapted for connection to said support and a second end connected to said mounting member for mounting said support for vertical swinging movement relative to said mounting member between lower and upper positions, and said linkage consisting of first, second and third links and first, second and third pivot means, said first link having a first end coupled by said first pivot means to said third link for pivotal movement about a first axis and a second end coupled by said second pivot means to said mounting member for pivotal movement about a second axis, said second link having a first end coupled by said third pivot means to said third link for pivotal movement about a third axis disposed parallel to said first and second axes and a second end supported on said mounting member solely by said second pivot means for sliding movement transversely of and for pivotal movement about said second axis; and locking means responsive to gravity for retaining said support in a selected vertical position immediate said lower and upper positions and responsive to a lifting force applied to said support for releasing said locking means to permit said support to undergo movement towards said lower position.