U.S. patent number 3,874,726 [Application Number 05/355,210] was granted by the patent office on 1975-04-01 for moulded chairs.
This patent grant is currently assigned to Sebel Limited. Invention is credited to Dillon Charles Furey, Harry Sebel.
United States Patent |
3,874,726 |
Sebel , et al. |
April 1, 1975 |
Moulded chairs
Abstract
A chair moulded in one piece from a suitable plastics material
stacks vertically, and has a seating area nearly as great as the
plan area of the seat, by waisting the back support at its junction
with the seat and rear legs, providing the rear legs with an
internally directed channel over the greater part of their length
which merges at the tops of the legs into the said waisted portion,
and making the side edges of the legs in the side planes of the
chair substantially vertical.
Inventors: |
Sebel; Harry (Bankstown,
AU), Furey; Dillon Charles (North Sydney,
AU) |
Assignee: |
Sebel Limited (Bankstown,
AU)
|
Family
ID: |
3765378 |
Appl.
No.: |
05/355,210 |
Filed: |
April 27, 1973 |
Foreign Application Priority Data
Current U.S.
Class: |
297/239;
D6/374 |
Current CPC
Class: |
A47C
3/04 (20130101); A47C 5/12 (20130101) |
Current International
Class: |
A47C
3/04 (20060101); A47C 5/00 (20060101); A47C
3/00 (20060101); A47C 5/12 (20060101); A47c
003/00 () |
Field of
Search: |
;297/239,DIG.2,216,452,445,458 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Gilliam; Paul R.
Assistant Examiner: Troutman; Doris L.
Attorney, Agent or Firm: Burns; Robert E. Lobato; Emmanuel
J. Adams; Bruce L.
Claims
We claim:
1. A chair stackable and rowable with an alike chair, comprising a
single body moulded from plastic material and defining a back
support, a seat, rear legs and front legs; the rear and front legs
having side edges which define lower parts of side planes of the
chair and said edges and planes being substantially vertical to
facilitate rowing of the chair with an alike chair; each year and
front leg defining a channel which, in cross-section, is convex
toward the inside of the chair, over an upper and at least a
greater part of its length, for receiving a corresponding
channel-like rear leg of an alike chair stacked thereon; the back
support having contracted waist portions adjacent the seat and the
rear legs, and the channel defined by the rear legs having top end
portions merging into respective, contracted waist portions to
facilitate stacking of the chair.
2. A chair as claimed in claim 1 wherein said channelshaped
cross-sections defined by the legs extend, and have diminishing
cross-sections, from the top of each leg downwards to adjacent a
lower end of the leg; a portion of the leg adjacent the lower end
being a solid piece of said plastic material.
3. A chair as claimed in claim 1 wherein an outward projection
extends across the channel of each leg adjacent the top of the leg,
and each leg has internal substantially vertical rib means, near
its top, for resting the lower ends of the rib means of one chair
on the outward projections of a lower chair when the chairs are
stacked.
4. A chair as claimed in claim 1 in which the seat has downwardly
extending front and rear skirts and the legs have flanges merging
with said skirts.
Description
This invention relates to moulded chairs, and more particularly to
a substantially vertical-stacking chair moulded in one piece from
plastics materials.
While chairs are known which stack almost vertically and are
moulded in one piece from plastics material, they do not give the
maximum desirable seating area for their overall dimensions in
plan. Accordingly for a chair of given maximum dimensions in plan,
and it is usually desirable not to exceed a maximum width of
nineteen inches for a chair used in public places such as
auditoriums, comfort is reduced, chairs also present problems when
arranged in rows due to the substantial gap between the chairs at
the seat level. This is due to the fact that the legs of
conventional, moulded chairs are splayed outwardly. For example, it
is a not uncommon requirement for public auditoriums that when
chairs are arranged in rows, the chairs must be connected together
in groups of, say, five. The purpose of this is to reduce the
likelihood of a chair being knocked over in panic situations, such
as in the case of fire, and blocking a row. The substantial gap at
seat level introduces difficulties in connecting the chairs
together in groups as part of the rows.
The present invention provides chairs which stack substantially
vertically, which are moulded in one piece from a plastics
material, and in which the seating area is nearly as great as the
plan area of the chair. The sides of adjacent chairs at seat level
are close together when put in rows, giving a more convenient row,
and making it easier to connect chairs together.
The objects of the present invention are achieved by making the
chair legs in at least the planes of the chair sides substantially
vertical, providing waist-like junctions of the backrest with the
seat and rear legs, and into shaping of the rear legs in to merge
the contracted waist-like junctions. By having the legs
substantially vertical as described the seating area is maximized,
while the waist-like shaping of the backrest and rear legs still
permits nearly vertical stacking.
Therefore according to this invention a substantially vertical
stacking chair moulded in one piece from plastics material and
having a back support, a seat, rear legs and front legs, is
characterized in that the side edges of the legs in the side planes
of the chair are substantially vertical, the back support at its
junction with the seat and the rear legs is contracted in
waist-form, and the rear legs have internally directed channels
over at least the greater part of their length which merges at the
tops of the legs into the contracted portions.
Reference will now be made to the accompanying drawings in
which:
FIG. 1 is a perspective view of a chair according to this
invention,
FIG. 2 is a rear elevation of the chair,
FIG. 3 is a side elevation,
FIG. 4 is a front elevation,
FIG. 5 is a bottom plan,
FIG. 6 is a section, to an enlarged scale, in the line 6--6 of FIG.
3,
FIG. 7 is a side elevation showing two chairs according to FIGS. 1
to 6 with one chair stacked on another, and
FIG. 8 is a top plan showing two chairs according to FIGS. 1 to 6
placed side by side.
The chair shown in the drawings may be moulded in one piece from a
suitable plastics material such as acrylonitrile-butadiene-styrene.
The chair consists essentially of a back support 1, seat 2, rear
legs 3, 4 and front legs 5, 6. The perimeter of the back support
has a rearwardly directed strengthening flange 7 which at the top 8
is also directed downwardly as well as rearwardly. The back support
is shaped to conform to the shape of the back of a seated person,
and at the bottom, where the back support of the new chair nerges
with the seat and rear legs, it is waist-shaped at 9, 10 as is best
seen in FIGS. 4 and 8. The flanges 7 continue downward past the
seat as rear flanges of the rear legs 3, 4. The sides of the seat
are turned down as skirts 11 with reinforcing beads 12 which beads
also extend down the insides of the front and rear legs. The skirts
11 merge into the flanges 7 by way of the waist portions 9, 10 so
as to form channels 13 which extends down the rear legs at 14 with
a slightly diminishing, channel-like cross-section until near the
bottoms of the rear legs where the channels cease at 15 and the
bottommost portion of the leg is moulded as a solid piece 16.
The front legs 5, 6 are also moulded with channels 17 whose
cross-section diminishes slightly from top to bottom, the channel
ceasing near the bottom of the legs which finish as a solid piece
18. The front of the seat also has a downwardly directed skirt 19
which merges with the front flanges 20 of the front legs. The
perimeter of the skirt 19 and flanges 20 is also provided with a
thickened strengthening beading 21.
The side skirts 11 also merge with the side flanges 22, 23 of the
front and rear legs respectively - these flanges narrow toward the
bottom and nearly disappear at the bottom.
A small outward projection 24 extends across each leg channel near
the top of the leg, and these projections form stops on which
internal projections or ribs 25 of each leg rest when one chair is
stacked on another.
An essential feature of the invention is that the edges of the
legs, in the planes of the two sides, are substantially vertical.
This can be seen in FIGS. 2 and 4 where the beadings 12 of the rear
legs 3,4 as well as those of front legs 5,6 lie in a vertical
plane. As a consequence two chairs can be placed side by side as
shown in FIG. 8 with the vertical and horizontal beadings 12 in
contact, or nearly so. The adjacent edges 26 of the seats are then
about one half inch apart at their closest points. The necessary
moulding draft angle in the legs to permit withdrawal of a chair
from a mould is provided in the front and rear planes of the legs.
This construction enables the seat to occupy most of the space of
the chairs and tends to maximize the seat area for a given overall
width of chair. Despite the vertical nature of the legs in the side
planes it is still possible to stack the chairs nearly vertically
as in FIG. 7. The stacking height is determined by projection 24
and cooperating rib 25 - by providing a positive stacking height by
these means jamming of chairs when stacked is virtually
eliminated.
Strengthening ribs are shown at 27, FIG. 5.
A central cavity can be provided in each solid foot 16 extending
upwardly from the bottom of the foot. Plastic glides or inserts can
be provided each of which has an upwardly directed part which fits
into the cavities, and an inverted mushroom base. The inserts may
be a force fit into the cavities, or be screwed or otherwise
secured in place. For a general purpose chair the bases of the
inserts will be about 21/2 centimetres thick, and the leading edge
of the chair will then be about 44 cms. from the floor. However,
either the front or rear inserts can be replaced by inserts having
bases of greater height or thickness, say 5 cm., to give a more
relaxed or more vertical seating posture respectively.
The chair can readily be adapted for people shorter than normal,
for example those wishing to have a leading edge of 42 cms. from
the floor, by fitment of inserts which are only 1/2 cm thick.
Postural adjustment can be provided by use of the 21/2 cm. inserts
in either front or rear legs.
When two or more chairs are to be joined together when placed side
by side (as in FIG. 8), which is commonly known as rowing, the side
skirts 11 can be used with whatever joining means are used.
Outwardly projecting stubs can be moulded into the skirts which
abut against each other when the chairs are rowed. One possible
joining means are bolts passing through the stubs.
The front legs of the chair are the same width as the rear legs -
it is impossible to keep chairs tidy in an auditorium where the
back legs are spaced apart more widely than the front legs.
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