An adjustable height chair has a pair of side frames and a seat frame with two seat/backrest portions secured together, with the seat frame pivotably mounted in the side frames. The chair height is changed by rotating the side frames in a direction opposite to the rotation of the seat frame, so that
An adjustable height chair has a pair of side frames and a seat frame with two seat/backrest portions secured together, with the seat frame pivotably mounted in the side frames. The chair height is changed by rotating the side frames in a direction opposite to the rotation of the seat frame, so that a seat panel which previously served as a platform to sit on becomes a backrest, and vice-versa. The chair preferably has one or more crossbars to serve the double duty of strengthening the frame of the chair, and supporting the seat panels in both sitting positions of the chair.
대표청구항▼
1. Furniture adjustable to provide a platform at each of two heights, said furniture comprising a. a first frame having first and second sides and forming first and second platforms at a substantial angle to one another,b. a second frame having a first side structure and a second side structure and
1. Furniture adjustable to provide a platform at each of two heights, said furniture comprising a. a first frame having first and second sides and forming first and second platforms at a substantial angle to one another,b. a second frame having a first side structure and a second side structure and at least one cross member secured to and extending between said first and second side structures,c. said first frame extending between and being pivotably attached at first and second pivot points to said first and second side structures of said second frame,d. each of said side structures of said second frame having at least one support leg structure,e. each of said support leg structures comprising a central leg member, said first pivot point being located on one of said central leg members, and said second pivot point being located on the other of said leg members,f. an arm/leg member being secured adjacent one end of said central leg member and forming an acute angle therewith,g. and a third member secured at one end to said central leg member to help support said furniture on a horizontal support surface when said pivot points are in a first position,h. with said furniture in a first position, said central leg member forming a first, relatively small acute angle with said horizontal surface, and said pivot points are in said first, relatively low position above said surface,i. said second frame being rotatable to a second position in which said central leg member and said arm/leg member contact said surface to support said furniture thereon, with said central leg member forming a second, relatively larger angle with said surface, with said pivot points at a higher elevation above said surface than their elevation when said furniture was in said first position,j. said first frame being rotated about said pivots in a direction opposite that in which said second frame is rotated to provide a seat in which the one of said platforms which was a seat, in said first position, now is a seat back,k. said cross member being positioned to support each of said platforms when said pivot points are at different heights above said horizontal surface. 2. A structure as in claim 1 in which said furniture is a chair and each of said platforms forms the seat or back of said chair, depending upon which of said two rotational positions said side structures is in. 3. A structure as in claim 2 including first and second pivot plates, each being secured to said first frame at one of said sides and extending from adjacent the intersection of said platforms to a position spaced therefrom in the included space between said platforms, said pivot plates being mounted to said pivot points at a location spaced from said intersection. 4. A structure as in claim 2 in which said third member is secured to said central member at a point adjacent said one end at which said arm/leg member is attached, said third member forming a substantial angle with said arm/leg member, whereby said third member forms an arm-rest when said furniture is in said second position. 5. A structure as in claim 4 in which, when said chair is in said second position, the angular space between said arm/leg member and said central leg member opens downwardly so as to be wider at the bottom and narrow at the top, and each is shaped so that it fits over the corresponding structure of another chair beneath it. 6. A structure as in claim 2 in which, when said chair is in said second position, the angular space between said arm/leg member and said central leg member opens downwardly so as to be wider at the bottom than it is at the top, and each is shaped so that it fits over the corresponding structure of another chair beneath it. 7. A method of adjusting the height of an item of furniture, said method comprising A. providing: a. a first frame having first and second sides and forming first and second platforms at a substantial angle to one another,b. a second frame having a first side structure and a second side structure and at least one cross member secured to and extending between said first and second side structures,c. said first frame extending between and being pivotably attached at first and second pivot points to said first and second side structures of said second frame,d. each of said side structures of said second frame having at least one support leg structure,e. each of said support leg structures comprising a central leg member, one of said first and second pivot points being located on said central leg member,f. an arm/leg member being secured adjacent one end of said central leg member and forming an acute angle therewith,g. and a third member secured at one end to said central leg member to help support said furniture above a horizontal support surface when said pivot points are in said first position,h. with said furniture in a first position, said central leg member forming a first, relatively small acute angle with a horizontal surface on which said furniture sits and said pivot points are in a first, relatively low position above said horizontal support surface,i. said second frame being rotatable to a second position in which said central leg member and said arm/leg member contact said surface to support said furniture thereon, with said central leg member forming a second, relatively larger angle with said surface, with said pivot points at a higher elevation above said surface than their elevation when said furniture was in said first position,j. said first frame being rotated about said pivots in a direction opposite that in which said second frame is rotated to provide a seat in which the one of said platforms which was a seat, in said first position, now is a seat back,k. said one cross member forming at least part of a support structure to support said platforms in each of two different rotational positions, andB. rotating said second frame relative to said first frame from one of said first and second positions to the other. 8. A method as in claim 7 in which said furniture is a chair and said platforms are seats/backrests of said chairs, said chair in one rotational position, having an inverted V-shaped leg structure for receiving another like chair below it, and the step of stacking said chair with at least one other like chair for storage. 9. A method as in claim 7 in which said providing step is selected from the group consisting of (1) providing another cross member to support one of said platforms when in seating position, and (2) locating said one cross member in a position to underlie each of said platforms when it is in seating position.
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이 특허에 인용된 특허 (5)
Yestadt, James F.; Yestadt, Frederick J., Adjustable height furniture.
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