Chair with occupant assisting features

A chair having a seat pivotally connected to a base frame, the seat's pivotal axis being horizontal and parallel to the front of the chair and located intermediate the front and back of the seat proximal its center of gravity. A hydraulic cylinder is attached; between the seat and base frame to dampen pivotal movement of the seat as a person is assisted into or out of the chair.

TECHNICAL FIELD 
The present invention relates generally to orthopedic chairs and more 
particularily to chairs with occupant-assisting features. 
BACKGROUND ART 
Persons suffering from physical maladies often experience great difficulty 
getting up from a chair well as lowering themselves into a chair. For 
example, arthritics, and persons having back and leg ailments, cannot 
easily flex their knees and initiate movements towards the standing or 
sitting position. 
The problems to which this invention addresses itself have been most 
commonly solved with electric recliner chairs. Having motorized power 
available, it is an easy thing to add what is termed an "elevating seat". 
In addition to being expensive, chairs employing electric motor power 
generally also are designed in the cushioned easy-chair style, and to the 
knowledge of the inventor, are available only as an adjunct to the 
reclining feature. Not everyone who desires a occupant-assisting chair 
also wishes an easy chair and not disabilities. 
Other chairs which have occupant-assisting features include those which 
employ hydraulic rams, extending arms which the occupant pulls or pushes 
in order to move the seat up or down with his body, and spring assisted 
chairs. Such devices are generally of benefit to one requiring such 
assistance. However, the hydraulic approach, like its electric powered 
counter part is expensive and subject to breakdown. Those with pull bars 
are suitable only for users having adequate strength in their arms and 
shoulders, and the spring assisted chairs are difficult to adjust for the 
different sizes and weights of users. 
DISCLOSURE OF INVENTION 
It is a general object of the present invention to provide an improved 
chair with occupant-assisting features. 
Another object is to provide a chair which assists a user into or out of a 
seated position. 
A further object of the present invention is to provide a chair with 
occupant-assisting features which is simple in structure, and easy to 
maintain and operate. 
Yet another object is to provide a chair with occupant-assisting features 
which is adjustable for persons of different weights and builds. 
Another object is the provisions of a chair with occupant assisting feature 
which relies on the shifting of weight by the occupant for its 
functioning. 
More generally, it is an object of the present invention to provide a chair 
having a seat pivotally connected to a ground-supported frame with a 
horizontal pivotal axis parallel to the front of the chair, said axis 
located intermediate the front and back of the seat at a location 
generally under the center of gravity of the seat. Hydraulic cylinders, 
which dampen the pivotal movement of the seat, are attached between the 
front and rear edges of the seat and the chair's frame. 
These and other objects, advantages and novel features of the present 
invention will become apparent from the following detailed description of 
the invention when considered in conjunction with the accompanying 
drawings.

BEST MODE FOR CARRYING OUT THE INVENTION 
Referring now to the drawings in which identical or corresponding parts are 
indicated by the same reference character throughout the several views, 
and more particularly to FIG. 1, the chair is designated generally at 10 
and has a ground-supported base frame, designated generally at 11, and a 
seat frame, designated generally at 12. 
Referring now to FIGS. 1, 2, and 3, base frame 11 includes two inverted 
"U"-shaped leg members 11a, each having a cross-member 11b affixed between 
the legs thereof. "U"-shaped leg members 11a are connected in a spaced 
apart and parallel relationship via parallel connecting members 12a, 12b 
and 12c, thus forming the four legs of chair 10. Connecting member 12a is 
affixed between an intermediate point on each cross-member 11b such that 
it is perpendicular to the planes of leg members 11a. Connecting member 
12b is affixed between leg members 11a at the juncture of cross-members 
11b with leg members 11a at the rear of base frame 11. Connecting member 
12c is affixed to the base portion, between leg members 11a at a point 
intermediate the legs, of "U"-shaped Members 11a. (see FIGS. 2 and 3). 
As best seen in FIGS. 2 and 3, a rigid seat-supporting beam 13 is affixed 
between leg members 11a at a location proximal to, and parallel with, 
connecting member 12c. The upper surface of beam 13 is in a horizontal 
plane below that of the upper surface of connecting member 12c, the 
distance between the planes being equal to the thickness of a closed 
leaf-type hinge 14 mounted on the upper surface of beam 13. The lower leaf 
14a of hinge 14 is affixed to the upper surface of beam 13 with its 
bearing portions 14b parallel with and just beyond the forward edge of 
beam 13. The upper leaf 14c of leaf hinge 14 is affixed to upper seat 
frame 12 (in a manner to be disclosed) such that seat frame 12 will pivot 
about the forward edge of beam 13. It can therefore be seen that 
connecting member 12c serves as a "stop," to restrain seat frame 12 from 
pivoting backwards beyond a normal sitting orientation. 
Seat frame 12 includes a pair of "L"-shaped parallel seat support members 
16 running from the front to the back. The rear-ward ends of seat supports 
16 are affixed to the base portion of a "U"-shaped arm rest 17. The legs 
of the "U" of arm rest 17 extend downwards at the front where a front 
cross member 17a is affixed between its free ends. The forward ends of 
seat supports 16 are affixed to cross-members 17a. 
The upper leaf 14c of leaf hinge 14 is affixed between seat supports 16 
such that its bearing portions 14b project below seat support 16 and where 
it is pivotally attached to the lower leaf 14a of leaf hinge 14. The total 
width of seat frame 12 is slightly less than the distance between leg 
members 11a, so that seat frame 12 may freely pivot forwards between the 
front legs of chair 10. 
Upper leaf 14c of leaf hinge 14 is located on seat frame 12 at a location 
such that the weight of seat frame 12 is roughly equal fore and aft of 
bearing portions 14b and 14c. Thus, only a minimal force is required to 
cause seat frame 12 to pivot on hinge 14. A person sitting down in, or 
arising from, said seat from a substantially standing position to a 
sitting position, or vice-versa, respectively, may do so with a minimal 
movement of his or her upper body backwards or forwards. 
Again referring to FIG. 1, hydraulic cylinder 19 is pivotally attached at 
its lower end to an intermediate point on cross-member 12a of base frame 
11 such that cylinder 19 will pivot within a plane parallel to each leg 
member 11a. Cylinder 19 is pivotally connected at its upper end to front 
cross-member 17a of seat frame 12. Since conventional cylinders supply a 
greater and more uniform bias in compression than in tension, a second 
cylinder 21 is pivotally affixed at its lower end to an intermediate point 
on cross-member 12b such that it also will pivot within a plane parallel 
to each leg member 11a. The upper end of cylinder 21 is pivotally 
connected to a plate 22 located aft of the pivot axis of seat 12 and 
depending from one of the seat supports 16 (see FIG. 2). Plate 22 has a 
series of apertues 11a punched therein so that the upper end of cylinder 
21 may be removably fastened through any one of said apertures 22a. 
Rear cylinder 21 will dampen rearward pivotal movement of seat frame 12 as 
a user seats himself therein. By refastening rear cylinder 21 within a 
different aperture 22a so that it is at a shallower angle, the amount of 
compressive bias is reduced, and a lighter weight person may be assisted 
into chair 10. Similarly, if cylinder 21 is fastened at a steeper angle, 
the compressive bias is increased to accommodate a heavier person. 
Cylinder 19 functions so as to dampen forward pivotal movement of seat 
frame 12, as the occupant leans forward to be assisted out of the chair 
10. 
A handgrip 24 is mounted to the forward end of each armrest 17 and extends 
upwardly and away from armrest 17. Handgrips 24 will allow the user to 
pull himself to a slightly forward leaning position in order to pivot seat 
frame 12, and be assisted out of chair 10. In this way, the occupant is 
not required to utilize his back muscles to bend forward and rise from 
chair 10. 
An upholstered back 26 is affixed to the bent portion of seat supports 16 
of seat frame 12. Upholstery is also added to the upper surfaces of 
armrests 17. An upholstered headrest 28 is affixed to a frame 29, which is 
mounted in a conventional manner upon the base portion of the "U" of 
armrest 17. A seat cushion 31 is mounted on seat supports 16 in a 
conventional manner. 
Upholstery buttons 31a are installed slightly rearward from the center of 
seat cushion 31 to form a slight depression. The depression serves to 
relocate the center of gravity of an occupant in chair 10 slightly farther 
back than a chair with a flat cushion. This enhances the assist features 
described hereinabove, since seat frame 12 will more easily pivot 
rearwardly with the added force applied to the rear portion of seat frame 
12 by this relocation of center of gravity. 
Conventional foot rests 32, of the type which may be pivoted between a 
vertical (as shown) and horizontal position, may be added to the front 
legs of chair 10, as required by the particular user. 
It will be readily understood that the particular disposition or 
arrangement or nature of the elements of the invention are not of the 
essence of the invention, and that many variations, substitutions, and 
modifications may be made in, the departure from the particular 
construction and characterization in the drawings and foregoing 
description, without departing from the true spirit of the invention. It 
is therefoe to be understood that the invention should be limited only by 
the breath and scope of the appended claims.