초록 ▼

A power operated chair lift mechanism including long links pivotally connected at one end to a horizontally movable follower block and pivotally connected at the other end to a vertically movable chair support, and short links pivotally connected at one end intermediate the ends of the long links an

A power operated chair lift mechanism including long links pivotally connected at one end to a horizontally movable follower block and pivotally connected at the other end to a vertically movable chair support, and short links pivotally connected at one end intermediate the ends of the long links and at the other end to the base to form an isosceles linkage for raising and lowering the chair in response to horizontal movement of the follower block. Auxiliary links are connected to a second follower block and to vertical guideways in the chair support and are pivotally connected intermediate their ends to the short links to provide a second isosceles linkage for maintaining the chair support in a fixed attitude during raising and lowering of the chair. The chair can be rotated about an upright axis in all vertically adjusted positions.

대표청구항 ▼

A power operated chair lift mechanism comprising, a base having horizontal linear guide means thereon, a chair support, a first follower means mounted on the horizontal linear guide means for horizontal movement relative to the base, first link means, means connecting one end of the first link means

A power operated chair lift mechanism comprising, a base having horizontal linear guide means thereon, a chair support, a first follower means mounted on the horizontal linear guide means for horizontal movement relative to the base, first link means, means connecting one end of the first link means to said first follower means for movement therewith and for pivotal movement relative thereto about a first horizontal axis, means connecting the other end of the first link means to the chair support for pivotal movement relative thereto about a second horizontal axis, a second link means, means connecting one end of the second link means to the first link means at a location intermediate the first and second horizontal axes for pivotal movement relative thereto about a third horizontal axis, means pivotally connecting the other end of the second link means to the base for pivotal movement relative thereto about a fourth horizontal axis at a fixed location, the spacing between the third and fourth horizontal axes along the second link means being equal to the spacing between the first and third horizontal axes along the first link means, means engaging said chair support for maintaining the chair support in a fixed attitude relative to the horizontal as the chair support is moved vertically, and power operated means connected to said first follower means for moving the first follower means along the horizontal linear guide means to raise and lower the chair support, said means for maintaining said chair support in a fixed attitude including, vertical guide means on the chair support, a second follower means on said horizontal linear guide means, a third follower means mounted on the vertical guide means for vertical movement relative to the chair support, a third link means shorter than said first link means, means connecting one end of said third link means to said second follower means for movement therewith and for pivotal movement relative thereto about a fifth horizontal axis, means connecting the other end of said third link means to said third follower means for movement therewith and for pivotal movement about a sixth horizontal axis, and means pivotally connecting said second link means to said third link means for relative pivotal movement about a seventh horizontal axis at a location on said third link means intermediate said fifth and sixth horizontal axes and at a location on said second link means intermediate said third and fourth horizontal axes.