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US 6,957,864 B2Granted
Chair with a stopping device
AssigneeNone recorded
InventorSu-Ming Chen
Life of this patent
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AssigneeNone recorded
InventorSu-Ming Chen
Estimating the term…
A chair includes an upper frame disposed above and pivoted to a lower frame. A stopping device includes a slide mounted slidably on the upper frame, and a stopping member. The slide is slidable between a first position, where the stopping member is offset from a rear plate of the lower frame in a longitudinal direction, and a second position, where the stopping member is aligned with the rear plate in a vertical direction. A cam mechanism includes a cam connected movably to side plates of the lower frame and a cam follower formed on the slide and engaging the cam in such a manner that movement of the cam from a releasing position to a restricting position results in movement of the slide from the first position to the second position.
A chair comprising:
The chair as defined in claim 4, further comprising second and third pivots, a backrest-supporting frame disposed rearwardly of said lower frame, and including two side plates extending in said longitudinal direction and pivoted respectively to said side plates of said lower frame through said second pivot and to said upper frame through said third pivot, said second and third pivots being disposed rearwardly of and being parallel to said first pivot, said stopping device further including an operating lever extending movably through said side plates of said backrest-supporting frame and movable in said transverse direction, said cam being mounted securely on said operating lever for co-movement therewith when said operating lever moves in said transverse direction, and having an inclined face which is inclined relative to said operating lever and which defines a first cam face, said slide having an inclined face that is inclined relative to said operating lever and that defines a second cam face which is in sliding contact with said first cam face by virtue of urging action of said urging member when said cam is moved between said releasing and restricting positions.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
The parts, being the back-rest, or the back-rest and seat unit, having adjustable inclination: by means of a peg-and-notch or pawl-and-ratchet…
Chairs
Term ended 9 Mar 2024 (estimated)
1. Field of the Invention
The present invention relates to a chair, more particularly to a chair with a stopping device for preventing tilting of a seat relative to a leg unit.
2. Description of the Related Art
Other features and advantages of this invention will become more apparent in the following detailed description of the preferred embodiment of this invention, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic side view of a conventional chair;
FIG. 2 is a fragmentary sectional view illustrating a top frame, a base frame and a position of the conventional chair;
Referring to FIGS. 3 to 6, the preferred embodiment of a chair according to the present invention is shown to include a leg unit 11, a U-shaped lower frame 3, first, second and third pivots 61, 62, 64, an inverted U-shaped upper frame 4, an urging mechanism 63, and a stopping device 7.
The leg unit 11 can include a hydraulically or pneumatically operated cylinder device.
The lower frame 3 has opposite front and rear ends, and includes a base plate 32 secured to a top end of the leg unit 110, spaced-apart side plates 31 extending between the front and rear ends in a longitudinal direction, and a rear plate 33 extending upwardly from the base plate 32. The rear plate 33 has an upper end 331.