Invalid chairs

Claim 2

An invalid chair comprising: a. a chair base having a pair of mutually parallel forwardly extending members forming part thereof, b. a seat portion, c. guide means connecting said seat portion to said chair base and comprising two legs which extend forwardly and downwardly from said seat portion and which are pivoted to said members, said guide means guiding said seat portion from a lowered position to a raised position with a combined upwArd, forward and forwardly tilting movement, d. extensions to said legs extending forward beyond said pivots, e. a longitudinally extending tie bar associated with each member, f. a pivotal connection between each tie bar and each of said extensions, g. a transversely extending longitudinally movable cross member connected to said tie bars, h. a fixed transversely extending frame member behind said cross member, and i. a plurality of extension springs extending rearwardly from said cross member to said transversely extending frame member, said springs urging said seat portion towards its raised position.

Claim 3

An invalid chair according to claim 1 further comprising a plurality of studs on said transversely extending cross member and said transversely extending frame member to anchor said springs therebetween.

Claim 4

An invalid chair according to claim 2 wherein the studs on the transversely extending frame member are in aligned relationship longitudinally of the frame member, and at least two of the studs on the transversely extending cross member are arranged in stepped relationship with respect to the studs on the transversely extending frame member.

Claim 5

An invalid chair comprising: a. a chair base, b. a seat portion, c. guide means connecting said seat portion to said chair base, said guide means guiding said seat portion from a lowered position to a raised position with a combined upward, forward and forwardly tilting movement, d. arms carried by said seat portion and movable therewith, e. resilient means operatively connected between said chair base and said seat portion to urge the seat portion towards said raised position, the force of said resilient means being adjustable to substantially balance the weight of an invalid whereby an invalid by leaning back overcomes the force of the springs and lowers the seat portion or maintains it in its lowered position but the invalid by leaning forward is either raised by the resilient means or remains in the raised position, f. a latch mechanism to enable the seat portion of the invalid chair to be held in the lowered position, said latch mechanism comprising a latch pivotally mounted on one of said seat portion and said chair base, g. a striker plate rigidly attached to the other of said seat portion and said chair base, h. spring loaded means operatively connected to the latch to maintain operative engagement between the striker plate and the latch in the lowered position of the seat portion of the chair, and i. a latch release mechanism incorporating a resilient link in said latch release mechanism whereby said latch mechanism is releasable only when said seat portion is held in its lowered position by the weight of an occupant but not when the seat portion is held in its lowered position by the latch mechanism.

Claim 6

An invalid chair comprising: a. a chair base, b. a seat portion, c. guide means connecting said seat portion to said chair base, said guide means guiding said seat portion from a lowered position to a raised position with a combined upward, forward and forwardly tilting movement, d. arms carried by said seat portion and movable therewith, e. resilient means operatively connected between said chair base and said seat portion to urge the seat portion towards said raised position, the force of said resilient means being adjustable to substantially balance the weight of an invalid whereby an invalid by leaning back overcomes the force of the springs and lowers the seat portion or maintains it in its lowered position but the invalid by leaning forward is either raised by the resilient means or remains in the raised position, f. a latch mechanism to enable the seat portion of the invalid chair to be held in the lowered position, said latch mechanism comprising a latch pivotally mounted on one of said seat portion and said chair base, g. a striker plate rigidly attached to the other of said seat portion and said chair base, h. spring loaded means operatively connected to the latch to maintain operative engagement between the striker plate and the latch in the lowered position of the seat portion of the chair, and i. a latch release mechanism incorporating a resilient link in said latch release mechanism whereby said latch mechanism is releasable only when said seat portion is held in its lowered position by the weight of an occupant but not when the seat portion is held in its lowered position by the latch mechanism.

Claim 7

An invalid chair according to claim 4, said resilient link comprising a plate member, a rod extending slidably through a hole in said plate member, a compression spring mounted on said rod and an abutment on said rod for said compression spring.