U.S. patent number 3,596,991 [Application Number 04/790,981] was granted by the patent office on 1971-08-03 for chair with occupant-assisting feature.
Invention is credited to Oliver F. Mckee, Wayne F. Mckee.
United States Patent |
3,596,991 |
Mckee , et al. |
August 3, 1971 |
CHAIR WITH OCCUPANT-ASSISTING FEATURE
Abstract
An armchair including hydraulically controlled seat and arms
whereby a forward and upward pivoting of the arms and seat can be
effected so as to raise an occupant from the chair. Alternatively,
the seat, in conjunction with a supporting base therefor and the
back of the chair, can pivot rearwardly so as to assume a partially
reclining position with a footrest, through an appropriate linkage,
extending to assume a leg-supporting position.
Inventors: |
Mckee; Oliver F. (Arvada,
CO), Mckee; Wayne F. (Lakewood, CO) |
Family
ID: |
25152312 |
Appl.
No.: |
04/790,981 |
Filed: |
January 14, 1969 |
Current U.S.
Class: |
297/286; 297/330;
297/DIG.10; 297/337 |
Current CPC
Class: |
A61G
5/14 (20130101); Y10S 297/10 (20130101) |
Current International
Class: |
A47C
1/031 (20060101); A47C 3/20 (20060101); A47C
3/30 (20060101); A61G 5/14 (20060101); A61G
5/00 (20060101); A47c 001/031 () |
Field of
Search: |
;297/330,337,326,334,335,339,338,DIG.10 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Zugel; Frandis K.
Claims
What we claim as new is as follows:
1. An occupant-assisting chair comprising a supporting framework, a
seat unit, a back, and a pair of laterally spaced arms, said seat
unit including a seat and a seat base, means pivotally securing
said seat to said seat base at a first pivot point, means for
pivotally swinging said seat in a vertical plane about the first
pivot point, means pivotally securing said base to said framework
at a second pivot point spaced from the first pivot point, means
for pivotally swinging said base and seat in a vertical plane about
said second pivot point, means pivotally securing said arms to said
framework, and means for pivotally swinging said arms in a vertical
plane, the swinging of the two arms and the seat about the first
pivot point being synchronized and simultaneously effected, the
means for pivotally swinging said seat about the first pivot point
comprising link means engaged directly between said arms and said
seat whereby movement of the seat is effected in direct response to
movement of said arms.
2. The chair of claim 1 including a footrest pivotally mounted at
the upper edge thereof to the forward position of said seat unit,
and means responsive to the pivotal movement of the base for
selectively extending and retracting said footrest forward of said
base.
3. The chair of claim 2 wherein the means for selectively extending
and retracting said footrest in response to movement of the base
comprises linkage means engaged pivotally between said footrest,
base, and framework whereby an upward pivoting of said base effects
an extension of said linkage means and a corresponding upward
pivoting of said footrest, and a downward pivoting of said base
effects a contraction of the linkage means and a corresponding
retraction of said footrest.
4. The chair of claim 3 wherein said means for pivotally swinging
said base and said seat about the second pivot point comprises a
rotatably mounted control rod, link means rigid at one end with
said control rod for rotation therewith and slidably engaged with
said base at the other end, and power means for selectively
rotating said control rod in opposite directions resulting in a
corresponding rotation of the attached link means and a
corresponding swinging of the base slidably engaged with the second
end of the link means.
5. The chair of claim 4 wherein said back is rigid with the rear
edge portion of said seat base and pivotally movable therewith
about the second pivot point.
6. An occupant assisting chair comprising a supporting framework, a
seat unit, a back, and a pair of laterally spaced arms, said seat
unit including a seat and a seat base, means pivotally securing
said seat to said seat base at a first pivot point, means for
pivotally swinging said seat in a vertical plane about the first
pivot point, means pivotally securing said base to said framework
at a second pivot point spaced from the first pivot point, means
for pivotally swinging said base and seat in a vertical plane about
said second pivot point, means pivotally securing said arms to said
framework, and means for pivotally swinging said arms in a vertical
plane, the swinging of the two arms and the seat about the first
pivot point being synchronized and simultaneously effected, said
back being rigid with the rear edge portion of said seat base and
pivotally movable therewith about the second pivot point.
7. The chair of claim 6 wherein said means for pivotally swinging
said base and said seat about the second pivot point comprises a
rotatably mounted control rod, link means rigid at open end with
said control rod for rotation therewith and slidably engaged with
said base at the other end, and power means for selectively
rotating said control rod in opposite directions resulting in a
corresponding rotation of the attached link means and a
corresponding swinging of the base slidably engaged with the second
end of the link means.
8. The chair of claim 6 wherein the means for pivotally swinging
said arms in a vertical plane comprises a hydraulic ram engaged
between each arm and an arm underlying portion of the
framework.
9. An occupant assisting chair comprising a supporting framework, a
seat unit, a back, and a pair of laterally spaced arms, said arms
being pivotally secured to said framework for swinging movement in
a vertical plane between a first generally horizontal position and
a second generally vertical position, power means engaged between
said framework and said arms for effecting a selective pivotal
adjustment of said arms, said seat unit including a seat pivotally
mounted for swinging movement in a vertical plane between a first
generally horizontal position and a second generally vertical
position, and means for enabling a synchronized vertically pivoting
adjustment of said seat in conjunction with the power means
adjustment of said arms between the first and second positions of
said arms and said seat, the means enabling a synchronized
adjustment of the seat comprising lift link means including a link
engaged between each arm and the seat, and a stabilizer link
pivotally secured at one end thereof to each lift link and having
the second end thereof slidably engaged with the corresponding side
edge of the seat for movement therealong in response to an angular
adjustment of the corresponding lift link resulting from the
pivotal swinging of the arms and seat.
10. The chair of claim 9 wherein each arm includes, toward the rear
end thereof, an adjustable arm support selectively movable between
a first position generally recessed within the arm and a second
position projecting perpendicularly upward therefrom.
11. The chair of claim 9 wherein said seat unit includes a base
rigid with said back, said base and said back, at the approximate
juncture therebetween, being pivotally secured at said framework
for a rearward swinging thereof relative to said arms and said
framework.
12. An occupant assisting chair comprising a supporting framework,
a seat unit, a back, and a pair of laterally spaced arms, said arms
being pivotally secured to said framework for swinging movement in
a vertical plane between a first generally horizontal position and
a second generally vertical position, power means engaged between
said framework and said arms for effecting a selective pivotal
adjustment of said arms, said seat unit including a seat pivotally
mounted for swinging movement in a vertical plane between a first
generally horizontal position and a second generally vertical
position, and means for enabling a synchronized vertically pivoting
adjustment of said seat in conjunction with the power means
adjustment of said arms between the first and second positions of
said arms and said seat, said seat unit including a base rigid with
said back, said base and said back, at the approximate juncture
therebetween, being pivotally secured to said framework for a
rearward swinging thereof relative to said arms and said
framework.
13. An occupant-assisting chair comprising a supporting framework,
a seat unit, and a back, said seat unit including a seat and a seat
base, means pivotally securing said seat to said seat base at a
first pivot point, means for pivotally swinging said seat in a
vertical plane about the first pivot point, means pivotally
securing said base to said framework at a second pivot point spaced
from the first pivot point, and means for pivotally swinging said
base and seat in a vertical plane about said second pivot point,
said back being rigid with the rear edge portion of said seat base
and pivotally movable therewith about the second pivot point, said
seat being separate from said back and pivotally swingable about
the first pivot point independent of said back.
14. The chair of the claim 13 wherein said second pivot point is
located approximately at the juncture between the back and the seat
base. 15The chair of claim 13 including a pair of laterally spaced
arms pivotally secured to said framework for swinging movement in
conjunction with said seat, each arm including, toward the rear end
thereof, an adjustable arm support selectively movable between a
first position generally recessed within the arm and a second
position projecting perpendicularly upward therefrom.
Description
The instant invention is generally concerned with the provision of
a chair which incorporates power adjusted sections for assisting an
occupant in both lowering into and rising from the chair as well as
assuming various reclining positions therein.
It is a primary object of the instant invention to provide a chair
which will find particular utility with the aged, sick or otherwise
incapacitated person who, because of the nature of the particular
condition involved, finds the normal physical exertion required to
enter and leave a chair beyond his capacity. In furtherance of this
object, the instant invention provides a chair, and more
particularly an armchair of the upholstered type, which
incorporates pivotally mounted arms and a pivotally mounted seat
power controlled for a selective forward and upward pivoting
thereof so as to raise an occupant from a seated position within
the chair to a standing position just forward of the chair with the
elevated arms and seat providing a continuous support for the
occupant as he rises from the chair. By the same token, a person
can, through a reversal of this operation, be lowered gently to a
fully seated position within the chair.
Another highly significant object of the instant invention is to
incorporate a powered reclining construction whereby an occupant of
the chair can adjust the chair to assume any of a plurality of
reclining or partially reclining positions. With regard to both the
reclining movement of the chair and the previously referred to
occupant raising and lowering movement, it is contemplated that an
appropriate control panel be provided on the chair itself within
convenient reach of the occupant.
These together with other objects and advantages which will become
subsequently apparent reside in the details of construction and
operation as more fully hereinafter described and claimed,
reference being had to the accompanying drawings forming a part
hereof, wherein like numerals refer to like parts throughout, and
in which:
FIG. 1 is a top plan view of the chair of the instant
invention;
FIG. 2 is a side elevational view of the chair and includes a
phantom line illustration of a partially elevated position of the
arms and seat;
FIG. 3 is a front elevational view of the chair;
FIG. 4 is a side elevational view of the chair with the arms and
seat in the fully elevated occupant discharging or receiving
position;
FIG. 5 is a side elevational view of the chair with portions broken
away and removed so as to illustrate the footrest-extending
linkage;
FIG. 6 is a partial side elevational view of the chair in its
reclining position;
FIG. 7 is a schematic illustration of one form of hydraulic system
which can be utilized;
FIG. 8 is a perspective view of the seat and back arrangement of
the chair;
FIG. 9 is a perspective view of the control means for effecting the
reclining of the chair;
FIG. 10 is an enlarged cross-sectional detail of the lower position
of the stabilizing link and the guide track therefor; and
FIG. 11 is a perspective detail of one of the shoulder supports
associated with the chair arms.
Referring now more specifically to the drawings, reference numeral
20 is used to generally designate the chair comprising the instant
invention. This chair 20 will be of the type incorporating side
arms 22 and normally, an upholstered body, the upholstery having
been removed from the illustrated chair so as to expose the
internal construction and operating components thereof.
The chair 20 includes a pair of laterally spaced vertically
orientated generally rectangular side frames 24 as well as a
horizontal box or base frame 26 located between the side frames.
Appropriate internal bracing, such as the diagonal brace 28, can be
provided in conjunction with the frames 24 and 26 as required to
ensure the rigidity or stability thereof.
Each of the sidearms 22 is pivotally engaged, as indicated at 30,
to the forward end of the generally horizontal top beam 32 of one
of the side frames 24, the arms 22, in the normal position thereof,
overlying the being directly supported on the top beams 32. A
double-acting hydraulic ram 34 is associated with each arm 22, each
ram 34 being pivotally mounted at the lower end 36 thereof to the
bottom beam 38 of the associated side frame 24 and, at the upper
end 40 thereof to the associated arm 22 in inwardly spaced relation
to the point 30 at which the arm 22 is pivotally mounted for
swinging in a vertical plane. In this manner, as the rams 34 are
extended, the movement thereof being synchronized, the two arms 22
will pivot vertically upward and forward. Incidently, in order to
reduce the bulk of the apparatus, it is contemplated that the rams
34 be mounted within the side frames 24 with the arm-engaging
piston rods 42 projecting through rod accommodating slots 44 within
the top beams 32.
A combination seat and back support 46 is positioned between the
side frames 24 and includes, in the normal position thereof, a
substantially horizontal seat base 48 and a generally vertical back
or back-defining structure 50. The support 46 includes, at the
approximate juncture between the base 48 and the back 50, a pair of
laterally directed stub shafts 52 which pivotally mount the support
46 between the rear portions of the opposed side frames 24 by
rotatably engaging through rearward winglike enlargements 54 on the
vertical rear members 56 of the side frames 24 whereby a rotational
movement of the seat and back support 46 within a vertical plane is
possible in a manner and for reasons which shall be explained
subsequently.
The actual seat 58 of the chair 20 is pivotally engaged with the
front of the seat base 48 for swinging movement in a vertical plane
thereabout, this seat 58, in its normal position, directly
overlying and being supported on the base 48.
The vertical pivoting of the seat 58 is to be synchronized with the
vertical movement of the arms 22. As such, a pair of rigid lift
links 60 are engaged between the arms 22 and the seat 58 to the
opposite sides thereof, each link 60 having a first end thereof
pivotally engaged with the corresponding side of the seat 58 toward
the rear thereof, and the second end thereof pivotally engaged with
the corresponding arm 22 in inwardly spaced relation to the rear
end thereof. Thus, as will be appreciated form FIGS. 2 and 4, the
raising and lowering of the arms 22, through the selective
extension and retraction of the rams 34, will result in a
corresponding raising and lowering of the seat 58 along
therewith.
Lateral stability is introduced into the lift links 60 and hence
the unsecured ends of the arms 22 by means of a pair of stabilizing
links 62. Each of the stabilizing links 62 is pivotally engaged at
one end thereof with one of the lift links 60 in spaced relation
below the corresponding arm 22, and is rotatably and slidably
mounted on the other end thereof in an elongated track 64 fixed to
the corresponding side of the seat 58, the second or lower end of
each stabilizer link 62 having a laterally directed enlarged
rollerlike head 66 thereon confined within the corresponding guide
track 64 for movement therealong in response to a pivotal
adjustment of the arms 22 and seat 58 so as to provide a constant
degree of lateral stability.
Referring now specifically to FIGS. 5, 6 and 9, the mechanism for
reclining the chair, and more particularly the combination seat and
back support 46, shall be detailed. As previously indicated, the
support 46 is pinned for rotational pivoting in a vertical plane to
the rear vertical member 56 of the side frames 24. The seat base 48
itself includes a pair of side-mounted depending elongated brackets
68, each having an elongated guide slot 70 defined therein. An
elongated control rod 72 extends transversely across the box frame
26 beneath the seat base 48 and has the opposite ends thereof
rotatably mounted within appropriate brackets 74 affixed to the
opposed sides of the box frame 26. A rigid control link 76 is
rigidly fixed to the control rod 72 at an intermediate point
therealong, this control link extending rearwardly and slightly
downwardly into pivotal engagement with the forward end of the
piston rod 78 of a double-acting hydraulic ram 80 which is in turn
pivotally mounted to the rear of the box frame 26 whereby a
selective extension and retraction of the ram 80 will result in,
through the rigid control link 26, a rotation of the control rod
72. This rotational movement of the control rod 72 is translated
into a vertical pivoting of the seat and back support 46 by means
of a pair of rigid links 82, each rigidly affixed to the control
rod 72 toward one end thereof and having a laterally projecting
stub shaft 84 projecting through and both rotatably and slidably
received within the slot 70 of the bracket 68 mounted on the
adjacent portion of the base 48. In this manner, as will be readily
appreciated from the drawings, upon an extension of the ram 80, a
clockwise rotation of the control rod 72 will be effected which in
turn results in a clockwise rotation of the links 82 and a
corresponding upward pivoting of the seat base 48, and hence the
entire support 46, about the pivotal axis thereof. With particular
reference to FIG. 6, it will be noted that, upon a rearward
pivoting of the support 46, the seat 58 itself actually pivots
slightly upward due to the fixed length of the lift link 60, thus
even further enhancing the reclining posture of the occupant of the
chair 20.
A footrest 86 is pivotally engaged across the front of the seat
base 48 and is link controlled for pivotal swinging in a vertical
plane between a first vertical position assumed when the chair 20
is in its normal or upright position, and a second substantially
horizontal position assumed when the support 46 is in the sully
reclined position. The link system which controls the movement of
the footrest 86 in response to the pivotal movement of the base and
back support 46 is preferably duplicated on each side of the base
48 and includes, noting FIG. 5 in particular, a first vertical link
88 pivotally fixed to the adjacent side of the base 48 at a point
downwardly spaced from the extreme upper end of the link 88. The
extreme upper end of the link 88 is pivotally engaged with a
rearwardly directed substantially horizontal link 90 which in turn
has the rear end thereof pivotally engaged with a downwardly and
forwardly inclined link 92. The lower end of the link 92 is
pivotally engaged with the corresponding side of the box frame 26.
Finally, a relatively short link 94 is pivotally engaged to the
lower end of the first link 88 and extends upwardly and forwardly
therefrom into pivotal engagement with the footrest 86. These links
88 through 94 are of a size and so orientated relative to each
other as to effect an upward and forward pivoting of the footrest
86 upon a movement of the base and back support 46 from the normal
seat-forming position of FIG. 5 to the reclined position of FIG. 6,
the links 90 and 92, upon assuming a generally vertical alignment
with each other, swinging the first link 88 upwardly and forwardly
so as to, through the short extension of link 94, raise or upwardly
pivot the footrest 86 therewith.
With reference to FIG. 7, one form of hydraulic system whereby the
control of the chair with regard to both the charging and
discharging of the occupant and the reclining of the seat and back
support can be effected has been illustrated. Basically, the
illustrated system includes an electric pump 96 as well as a pair
of electromagnetic control valves 98 whereby the fluid can be
selectively directed either to the arm control rams 34 or the seat
and back reclining ram 80. An appropriate control box 100 will be
provided within easy reach of the occupant of the chair on one of
the chair arms 22. As an alternative to the positioning of the
control box 100 directly on the arm 22, handgrips 102 can be
provided on the arms 22 for assisting the occupant in stabilizing
himself during the raising and lowering movement of the arms and
seat with the controls being provided on one of these handgrips
102. Likewise, various other hydraulic systems can of course be
utilized, for example separate systems one operating the arms and
seat, and the other operating the reclining support 46.
As an additional means for stabilizing the occupant of the chair as
he is being lowered into or raised from the chair, a pair of
pivotally mounted rests 104 are provided, one on each of the arms
22 adjacent the rear end thereof. Each rest 104 actually consists
of a block received within a mating notch 106 formed within the
inner edge portion of the corresponding arm 22, this block being
pivotally mounted for movement between a first position received
within the notch 106 coplanar with the arm 22 and a second position
projecting perpendicularly therefrom. The rest 104 has a bracket
108 mounted on the lower face thereof, this bracket having a curled
edge portion 110 which is, upon a movement of the rest 104 to the
second projecting portion, received about a rigid rod 112 fixed to
the arm 22 and lying across the notch 106 whereby the rest 104 is
stabilized in its projecting position so as to sustain the weight
of the occupant of the chair during the lifting or lowering
operation. Incidently this rod 112 also acts so as to support the
rest 104 in its downwardly pivoted or closed position. The two
rests 104 will engage the occupant beneath his armpits and hence
provide a positive support for the occupant as the arms, and hence
the occupant, approach the vertical position, thus providing a
secure support for the occupant against any tendency for the
occupant to slide forwardly out of the seat. If so desired, the
pivotal mounting of each of the rests 104 can be such as to retain
each rest 104 in a pivotally moved position until again physically
moved, thus enabling the rest 104 to project perpendicularly upward
from the arm 22 when the arm 22 is in its normal horizontal
position. In this manner, the rests 104 will be orientated to take
the load of the occupant as the arms gradually raise, the full
weight of the occupant being transmitted to the arms through the
pin-engaged brackets 108 on the rests 104.
From the foregoing, the operation of the chair should be readily
appreciated. Basically, through the power manipulation of the arms
and seat, an incapacitated person can lower himself into a proper
seated position within the chair, and subsequently raise himself to
an upright position out of the chair, in each instance being
securely and safely supported by means of a direct supporting
engagement of both the arms and the seat with the body of the
occupant. Once a seated position is assumed within the chair, the
chair itself, also through an occupant controlled manipulation of
the power system, can be reclined, with an associated footrest
portion elevating so as to lift the legs of the occupant. In the
power system, it is contemplated that the control valves be such so
as to allow the operative components to be locked in any adjusted
position thereof.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous modifications and changes
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation
shown and described, and accordingly all suitable modifications and
equivalents may be resorted to, falling within the scope of the
invention.
* * * * *