The present invention is directed generally to lift chairs, and more particularly to lift chairs having reclining capability.
Conventionally, power-assisted chairs typically include a motor-operated lift mechanism for aiding invalids and those persons requiring assistance in entering or exiting the chair. More particularly, motor-operated lift mechanisms are interconnected between a stationary base assembly and a moveable chair frame. An example of such a power-assisted chair is disclosed in U.S. Pat. No. 4,993,777 to LaPointe.
Some power-assisted chairs also include separate linkage mechanisms for permitting the seat occupant to selectively actuate an extensible leg rest assembly and/or produce reclining angular movement of a seat assembly between “upright” and “reclined” positions. However, many power-assisted chairs which provide such a multi-functional combination require the use of multiple motors for driving (i.e., pushing) the separate linkages which results in extremely large and expensive chair units yet still having limited reclining options. Moreover, such power-assisted chairs typically incorporate a drive mechanism which employs both a power “drive” function (i.e., for extending the leg rest, lifting the chair, and/or reclining the chair) and a power “return” function for returning the chair to the normal seated position.
One power-assisted lift chair that employs a single actuator is disclosed in U.S. Pat. No. 5,730,494 to LaPointe et al. This chair employs a linear actuator with a carrier, wherein the carrier moves rearwardly relative to the base to lift the chair from its upright position. The carrier moves forwardly to move the chair from its upright position to its TV and fully reclined positions.
Those skilled in this art will appreciate that additional chair designs with improved functionality may be desirable.
As a first aspect, embodiments of the present invention are directed to a seating unit. The seating unit comprises: a base; a frame with arms on opposing sides; a seat; a backrest; at least one ottoman; a reclining mechanism, a lift mechanism and a power unit. The reclining mechanism interconnects the frame, the seat, the backrest, and the at least one ottoman, and comprises a series of pivotally interconnected links and configured to move the seating unit between (a) an upright position, in which the backrest is generally upright and defines a first backrest angle relative to horizontal, the seat is generally horizontal, and the at least one ottoman is retracted below the seat, (b) a TV position, in which the backrest substantially maintains the first backrest angle, and the at least one ottoman is extended in front of the seat, and (c) a fully reclined position, in the at least one ottoman remains extended on front of the seat, and the backrest defines a second backrest angle relative to horizontal that is shallower than the first backrest angle. The lift mechanism interconnects the base and the frame and is configured to move the seating unit between the upright position and a lift position, in which both the frame and the seat are raised and tilted forward from their respective positions in the upright position, and the backrest defines a third backrest angle relative to horizontal that is greater than the first backrest angle. The power unit is interconnected with the reclining mechanism and the lift mechanism and is configured to move the seating unit between the lift, upright, TV and fully reclined positions. A lowermost portion of the backrest moves substantially directly vertically when moving from the upright position to the lift position. In such a configuration, the arrangement of the backrest and/or seat can provide the occupant with a more secure sensation as the chair lifts; it does not produce a sensation of the occupant being “thrown” from the chair, as can be the case with other lift chairs.
As a second aspect, embodiments of the present invention are directed to a seating unit comprising: a base; a frame with arms on opposing sides; a seat; a backrest; at least one ottoman; a reclining mechanism; a lift mechanism; and a power unit. The reclining mechanism interconnects the frame, the seat, the backrest, and the at least one ottoman and comprises a series of pivotally interconnected links and configured to move the seating unit between (a) an upright position, in which the backrest is generally upright and defines a first backrest angle relative to horizontal, the seat is generally horizontal, and the at least one ottoman is retracted below the seat, (b) a TV position, in which the backrest substantially maintains the first backrest angle, and the at least one ottoman is extended in front of the seat, and (c) a fully reclined position, in the at least one ottoman remains extended on front of the seat, and the backrest defines a second backrest angle relative to horizontal that is shallower than the first backrest angle. The lift mechanism interconnects the base and the frame and is configured to move the seating unit between the upright position and a lift position, in which both the frame and the seat are raised and tilted forward from their respective positions in the upright position, and the backrest defines a third backrest angle relative to horizontal that is greater than the first backrest angle. The power unit is interconnected with the reclining mechanism and the lift mechanism and is configured to move the seating unit between the lift, upright, TV and fully reclined positions. The seat defines a first seat angle in the upright position and a second seat angle in the lift position, and the difference between the first and second seat angles is between about 13 and 21 degrees.
The present invention will be described more particularly hereinafter with reference to the accompanying drawings. The invention is not intended to be limited to the illustrated embodiments; rather, these embodiments are intended to fully and completely disclose the invention to those skilled in this art. In the drawings, like numbers refer to like elements throughout. Thicknesses and dimensions of some components may be exaggerated for clarity. Well-known functions or constructions may not be described in detail for brevity and/or clarity.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein the expression “and/or” includes any and all combinations of one or more of the associated listed items.
In addition, spatially relative terms, such as “under”, “below”, “lower”, “over”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. Thus, the exemplary term “under” can encompass both an orientation of over and under. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
This invention is directed to seating units that have a stationary base, a seat portion, and a backrest. As used herein, the terms “forward”, “forwardly”, and “front” and derivatives thereof refer to the direction defined by a vector extending from the backrest toward the seat parallel to the underlying surface. Conversely, the terms “rearward”, “rearwardly”, and derivatives thereof refer to the direction directly opposite the forward direction; the rearward direction is defined by a vector that extends from the seat toward the backrest parallel to the underlying surface. The terms “lateral,” “laterally”, and derivatives thereof refer to the direction parallel with the floor, perpendicular to the forward and rearward directions, and extending away from a plane bisecting the seating units between their armrests. The terms “medial,” “inward,” “inboard,” and derivatives thereof refer to the direction that is the converse of the lateral direction, i.e., the direction parallel with the floor, perpendicular to the forward direction, and extending from the periphery of the seating units toward the aforementioned bisecting plane.
The seating units illustrated and described herein comprise a plurality of pivotally interconnected links. Those skilled in this art will appreciate that the pivots between links can take a variety of configurations, such as pivot pins, rivets, bolt and nut combinations, and the like, any of which would be suitable for use with the present invention. Also, the shapes of the links may vary as desired, as may the locations of certain of the pivots. Moreover, in some instances combinations of pivot points may be replaced by equivalent structures, such as “slider-crank” configurations, like those described in B. Paul, Kinematics and Dynamics of Planar Machinery 4-21 (1979).
Referring now to the figures, a reclining lift chair, designated broadly at 10, is illustrated in
Referring now to
The frame 14 includes arms 29 and a rear panel 31 that spans the arms 29. Each arm 29 comprises an inner panel 40 and an outer panel 42 that are separated by spacers 41a, 41b, thereby forming a cavity 43 within each arm 29.
Still referring to
The lift mechanism 23 is configured to move the chair 10 between an upright position (shown in
Referring now to
A lift mounting plate 44 is mounted to the outer surface of the inner arm panel 40. A lift mounting bracket 46 is fixed to the outer surface of the lift mounting plate 44 and extends laterally therefrom. A lift link mounting bracket 30 is mounted on a side rail 24 of the base 12 forwardly of the cross-member 25 and extends upwardly therefrom.
A rear lift link 36 is pivotally mounted to the lift link mounting bracket 30 at a pivot 38. A front lift link 32 is pivotally mounted to the lift link mounting bracket 30 at a pivot 34. Each of the front and rear lift links 32, 36 extends upwardly and forwardly from its respective pivot 34, 38 to a respective pivot 50, 52 with the lift mounting bracket 46. A cover 47 shields the lift links 32, 36 from the outside.
Referring now to
Turning now to the reclining mechanism 21, each of the reclining mechanisms 21 is a mirror image of the other reclining mechanism about a vertical plane that extends from the front of the chair 10 to the rear centered between the arms 29. In the interest of brevity, only one reclining mechanism 21 will be described herein, with the understanding that the discussion is equally applicable to the other reclining mechanism 21. Also, the reclining mechanism will be described first with respect to the fully reclined position (
Referring still to
Still referring to
Referring still to
Referring once again to
A drive link 168 is attached to the front ottoman drive link 108 at a pivot 172, and extends rearwardly therefrom to a pivot 170 with the frame mounting bracket 60.
Operation of the chair typically begins in the upright position (
Still referring to
To move the chair 10 to the TV position of
Rearward movement of the seat 16 also forces the backrest 18 rearwardly relative to the frame 14 and rotates the backrest 18 very slightly counterclockwise. However, the backrest 18 substantially retains the first backrest angle between it and the seat 16 observed in the upright position of
To move the chair 10 to the fully reclined position of
The chair 10 can be returned to the TV and/or upright position by actuating the actuator 54 to do so. As the rod 58 extends from the sleeve 57, the chair 10 reverses the sequence described above.
The chair 10 can be moved from the upright position of
In the lift position, the backrest 18 typically has an angle relative to horizontal of between about 81 and 101 degrees. As such, the lowermost portion of the backrest 18 has moved substantially directly vertically from its position in the upright position; for example, the lowermost portion of the backrest 18 may move only 0 to 1.25 inches forward relative to the base 12. Also, the seat 16 typically moves such that the rearmost edge thereof moves between about 0.25 and 1.25 inches forwardly, and the pitch angle of the seat is between about 13 and 21 degrees relative to horizontal. This movement of the backrest 18 and/or seat 16 can provide the occupant with a more secure sensation as the chair 10 lifts; it does not produce a sensation of the occupant being “thrown” from the chair, as can be the case with other lift chairs.
Also, with reclining and lift mechanisms of this configuration, the chair can take many different styles, including off-the-floor and high leg styles that are typically difficult to employ with reclining lift chairs.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention.
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Number | Date | Country | |
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20110291460 A1 | Dec 2011 | US |