U.S. patent number 3,659,897 [Application Number 05/073,945] was granted by the patent office on 1972-05-02 for seat construction.
Invention is credited to John Dale Wright.
United States Patent |
3,659,897 |
Wright |
May 2, 1972 |
SEAT CONSTRUCTION
Abstract
A seat member is hinged to a base member and a plurality of
springs are located between the members to resiliently urge them
apart. Each spring is made of two counterposed leaf portions joined
together at one end and secured to one of the members at the other
end. The springs are arranged so that the spring force increases as
the seat member moves downwardly, and vice versa.
Inventors: |
Wright; John Dale (Rochelle,
IL) |
Family
ID: |
22116758 |
Appl.
No.: |
05/073,945 |
Filed: |
September 21, 1970 |
Current U.S.
Class: |
297/337;
297/DIG.10; 267/142 |
Current CPC
Class: |
A47C
7/445 (20130101); A47C 7/14 (20130101); Y10S
297/10 (20130101); A61G 5/14 (20130101) |
Current International
Class: |
A47C
7/14 (20060101); A61G 5/14 (20060101); A61G
5/00 (20060101); A47c 003/32 () |
Field of
Search: |
;297/456,302,DIG.10,337
;267/142,80,41 ;280/63 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McCall; James T.
Claims
The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. In a seat construction including a base member, a seat member,
and means swingably connecting the members at the front side
thereof, the improvement comprising: spring means located between
the members for urging the seat member from a lower position
adjacent the base member to a raised position at an angle to the
base member, the spring means including two counterposed arcuate
leaf springs each having front and rear ends, means securing each
rear end to a respective one of the members, means securing the
front ends of the leaf springs to each other at about a point on
the bisector of the angle between the members, and said
counterposed leaf springs being capable of lying generally flat
against each other along substantially their entire length when the
seat member is at its lower position, whereby the seat member can
move to the lower position under weight of an occupant while the
leaf springs flatten against each other between the members, and to
the raised position under the force of the springs when the weight
is removed.
2. The combination of claim 1 including means for limiting movement
of the seat member away from the base member under urging of the
spring means to the raised position.
3. The combination of claim 2 wherein the last-mentioned means
limits the movement of the seat member to the raised position at an
acute angle to the base member thereby positioning the seat member
for contact by an occupant.
4. A seat construction including a base member, a seat member,
means swingably connecting the members at the front side thereof
for movement of the seat member between a raised position and a
lower position adjacent the base member, leaf spring means
operatively connected to the members for resiliently urging the
seat member to its raised position, the leaf spring means having an
effective length which shortens as the seat member moves to the
lower position for increasing the force of said urging as the seat
member moves toward its lower position, so that the force is at a
maximum when the seat member is in its lower position and at a
minimum when in its raised position.
5. A seat construction as set forth in claim 4 wherein the leaf
spring means includes two counterposed portions joined together
adjacent the front thereof and at a location between the members,
each portion having a rear end attached to one of the members
adjacent the rear thereof, and the counterposed portions so
constructed and arranged that they lie generally flat against each
other between the members along substantially their entire length
when the seat member is at its lower position.
Description
BACKGROUND
This invention pertains generally to chairs and seats, and more
particularly to a seat construction having a tiltable seat
member.
It is sometimes difficult for an aged or infirmed person to be
seated, or to arise from a seat, without assistance. In the prior
art there has been provided chairs having seats which are
spring-urged upwardly to aid an invalid or other person to rise
from the seat. For example, see U.S. Pat. No. 3,158,398. The prior
art has at least two deficiencies. First, prior spring arrangements
have required considerable storage space when the seat member is at
the lower, seating position. More importantly, springs are
constructed to exert a substantially uniform force throughout their
range of operation. If a strong spring is utilized in order to give
the greatest desired lift at the lower position, the force at the
raised position is too strong and operates almost as an ejector.
This is aggravated by the fact that less of the occupant's weight
is supported adjacent the raised position than at the lower
position.
SUMMARY
The present invention relates to a seat construction having a
tiltable seat member.
It is an object of the present invention to provide a seat
construction with a tiltable seat member in which the spring takes
up little space in the lower, seating position.
Another object is to provide a seat construction of the type
described which overcomes the deficiencies of the prior art.
Still another object is to provide a seat construction with a
tiltable seat member which has its greatest lifting force in the
lower position.
These, and other objects and advantages of the present invention,
will become apparent as the same becomes better understood from the
following detailed description when taken in conjunction with the
accompanying drawings.
DRAWINGS
FIG. 1 is a perspective view of the present invention with a
portion of the cover broken away for better illustration of the
parts;
FIG. 2 is a side elevation view, with the cover removed,
illustrating the relationship of the parts in the raised position;
and,
FIG. 3 is a side elevation view similar to FIG. 2, but also having
the web removed, and showing the relationship of the parts in an
intermediate position as the seat member moves to the lower
position, and with another position illustrated in phantom
lines.
DESCRIPTION
Reference is now made more particularly to the drawings which
illustrate the best presently known mode of carrying out the
invention and wherein similar reference characters indicate the
same parts throughout the several views.
The seat construction includes a base member 11 and a seat member
12. The seat member advantageously includes a cushion portion 13
and a support portion 14 which is swingably connected to the base
member by a hinge 16. The hinge 16 may be of any convenient
construction and is herein shown as a piano hinge. The support
portion 14 and the base member 11 may be constructed of any
suitable materials such as wood, metal or plastic. While these
parts are herein shown as generally solid pieces, it is deemed
obvious that they may be in the shape of a frame or otherwise
shaped. The cushion portion 13 can be of any convenient
construction, such as foam or innerspring, and may be eliminated if
desired. Base member 11 has a plurality of openings 11a formed
therein adjacent its rear edge. Similarly, portion 14 has a
plurality of openings 14a.
A plurality of springs, generally designated 20, are provided for
resiliently urging the seat member 12 to its raised position
illustrated in FIGS. 1 and 2. Each spring 20 is preferably a leaf
spring and is herein formed of two counterposed leaf springs 22 and
24 each having front and rear ends. The front ends of the
counterposed leaf springs are secured together in any convenient
manner, such as by welding. The rear ends of the leaf springs are
disposed in the openings 11a and 14a, as best shown in FIG. 1. The
front ends of the leaf springs, where they are joined, are
advantageously disposed at the bisector of the angle between the
base member 11 and seat member 12 for a purpose which will
hereinafter be explained.
A web 32, shown in phantom lines in FIG. 1, is connected to the
base member 11 and seat member 12 to positively limit movement of
the seat member away from the base member under urging of the
springs 20 to the raised position. At the raised position, the seat
member 12 is preferably at an acute angle to the base member. This
angle is preferably about 45.degree. or slightly greater.
A cover 34, of any suitable material, can be applied to cover the
seat construction and hide the springs 20 if desired. If suitable
materials are selected, the cover material can assume the function
of the web 32.
Referring now to the side elevation views, the seat construction is
illustrated in the raised position in FIG. 2. Here it can be seen
that the inner ends of the leaf springs 22 and 24 are generally at
the bisector of the angle between the base member 11 and seat
member 12. It will be noted that the leaf springs 22 and 24 engage
each other only at their inner ends when in this raised position.
Referring now to FIG. 3, there is illustrated moved positions of
the seat member 12. As the seat member 12 is moved to its lower or
seated position under the weight of an occupant, the inner end of
the spring 20 moves slightly toward the hinge 16 while remaining
substantially at the bisector of the angle between the base and
seat members. As the spring 20 is forced downwardly, greater areas
of the leaves 22 and 24 come into contact with each other. This
increases the stiffness of the leaves and thereby increases the
resistant pressure of the spring 20. When the seat member 12 is at
the lower position, this force is at the maximum. At the same time,
the leaves 22 and 24 are generally contiguous to each other along
most of their length so that they are stored between the base
member 11 and seat member 12 thereby assuming little space.
The embodiment illustrated is adapted for use with an existing
chair or other article of seating. When so used, the bottom of base
member 11 should be covered with a suitable non-slip material. This
can be a portion of cover 34 or the top and sides of the cover 34
can be other suitable upholstery material.
It is now deemed obvious that the present invention overcomes the
disadvantages of the prior art and provides a spring arrangement
which takes little storage space in the lower, seated position.
Additionally, it is deemed obvious that the present invention
provides a novel arrangement in which the force of the spring
increases to a maximum at the lower position and thereby gives the
greatest lifting power where it is needed most. Conversely, the
least force is applied at the raised position and thereby reduces
the possibility of a feeling of ejection by an occupant arising
from the seat.
While a preferred embodiment of the invention has herein been
illustrated and described, this has been done by way of
illustration and not limitation, and the invention should not be
limited except as required by the scope of the appended claims.
* * * * *