U.S. patent number 3,815,956 [Application Number 05/320,495] was granted by the patent office on 1974-06-11 for rotary armchair.
This patent grant is currently assigned to Mauser Kommanditgesellschaft. Invention is credited to Karl Bocksch, Willi Hensel.
United States Patent |
3,815,956 |
Bocksch , et al. |
June 11, 1974 |
ROTARY ARMCHAIR
Abstract
A base carries an upright telescopic spring-loaded column the
lower end of which is removably received in a conical seat of the
base, and the upper end of which is also provided with a conical
seat. A discrete arm-rest unit has two symmetrically shaped tubular
elements, the outer ends of which are connected by respective
armrests, and the center of which is bridged by a connecting plate
having a conical opening into which the conical seat at the upper
end of the column is insertable so that a portion of the conical
seat extends upwardly out of the plate. A seat unit including a
seat and the backrest extending upwardly from the seat, is provided
at the underside of the seat with a socket into a conical recess of
which the upwardly extending part of the conical seat of the upper
end of the telescopic column is insertable.
Inventors: |
Bocksch; Karl (Arolsen,
DT), Hensel; Willi (Willingen, DT) |
Assignee: |
Mauser Kommanditgesellschaft
(Koln, DT)
|
Family
ID: |
5832240 |
Appl.
No.: |
05/320,495 |
Filed: |
January 2, 1973 |
Foreign Application Priority Data
Current U.S.
Class: |
297/344.21;
297/411.31; 297/411.46; 297/411.4 |
Current CPC
Class: |
A47C
3/18 (20130101); A47C 7/546 (20130101); A47C
3/20 (20130101) |
Current International
Class: |
A47C
3/18 (20060101); A47C 3/00 (20060101); A47C
7/54 (20060101); A47C 3/20 (20060101) |
Field of
Search: |
;297/349,418,416,411,412,440,445 ;248/415,405,406 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Zugel; Francis K.
Attorney, Agent or Firm: Striker; Michael S.
Claims
What is claimed as new and desired to be protected by Letters
Patent is set forth in the appended claims:
1. A rotary armchair, comprising a base; a spring-loaded
telescopable column connected with and extending upwardly from said
base, said column including an outer tube having a lower end
secured to said base and an upper end, and a turnable inner tube
extending through said upper end and provided with a conical free
end portion having a lower and an upper section; a discrete armrest
unit comprising two symmetrical shaped tubular elements having
respective farther-spaced outer ends bridged by armrests, and
closer-spaced center portions bridged by a connecting plate which
is provided with a conical opening arranged to receive said lower
section so as to releasably connect said unit with said column; and
a seat unit including a seat, a backrest extending upwardly from
said seat, a socket at the underside of said seat and having a
conical recess arranged to receive said upper section so as to
releasably connect said seat unit with said column, and a
projection on said seat and engaging one of said tubular elements
to thereby prevent relative angular displacement of said units.
2. A rotary armchair as defined in claim 1, wherein said base is of
substantially cruciform configuration.
3. A rotary armchair as defined in claim 2, wherein said base has a
plurality of projections; and further comprising casters on the
respective projections.
4. A rotary armchair as defined in claim 1, said armrests being
elongated and having spaced ends provided with inwardly extending
passages, the respectively associated outer ends of said tubular
elements each being received in stressed condition in one of said
passages; and pin means securing the respective outer ends in the
associated passages.
5. A rotary armchair as defined in claim 1, said base having a
conical bore; and wherein said lower end of said outer tube is
conically configurated and releasably received in said conical
bore.
6. A rotary armchair as defined in claim 1, wherein said armrests
each comprise a support, and padding on said support.
7. A rotary armchair as defined in claim 1, wherein said connecting
plate is welded to said tubular elements.
Description
BACKGROUND OF THE INVENTION
The present invention relates generally to a rotary armchair, and
more particularly to a spring-loaded rotary armchair, and still
more particularly to a spring-loaded rotary armchair which is
adjustable in its height.
Spring-loaded chairs which can be rotated and which may or not be
adjustable in the height of their seat, are already quite well
known. As a rule they are used as office furniture. There are two
basic types of such chairs, namely those having armrests and those
which are not provided with armrests. If the chair is of the type
having an armrest then it is well known to connect the armrests via
their carriers to the underside of the chair seat, either by
screwing them to the chair seat or by welding them to it. Of
course, this requires additional operating steps in assembling the
chair and increases not only the manufacturing cost but also the
manufacturing time and, in consequence, the selling expense of such
chairs.
Aside from these obvious disadvantages there are, however, other
disadvantages in this type of furniture, resulting from the fact
that the armrests are secured to the seat in such a manner that
they can be removed either only with great difficulty or not at
all. In particular, this results from the fact that there are
instances where particular type of work to be performed by a person
sitting on such a chair requires that the armrests be removed
because they hinder the movements of the user. Of course, if the
armrests are welded to the seat then they cannot be removed at all,
and even if they are only screwed in place they are also difficult
to remove and subsequently to reinstall. Conversely, it is
sometimes desirable to purchase first a rotary chair without
armrests and at a later date to be able to convert this chair to a
chair having armrests, a possibility which is also precluded by the
present state of the art.
Evidently, therefore, the existing state of the art is in need of
further improvement.
SUMMARY OF THE INVENTION
It is, accordingly, a general object of the present invention to
provide such improvements.
More particularly it is an object of the present invention to
provide a rotary chair, in particular a rotary armchair, which can
be produced and assembled much more simply and less expensively
than heretofore known from the art.
Another object of the invention is to provide such a rotary
armchair which makes it possible for a user to convert the chair
readily, without the use of tools and in a brief span of time from
a chair having arms to a chair without arms, or vice versa.
An additional object of the invention is to provide such a rotary
armchair in which all components can readily be disassembled for
storage and, in particular, for packing and distribution purposes.
This, however, is a requirement which must harmonize with the
above-indicated requirement that the components of the armchair
should be capable of being assembled and disassembled by a user
without the need for tools and special connecting means.
In keeping with these objects, and others which will become
apparent hereafter, one feature of the invention resides in a
rotary armchair which, briefly stated, comprises a base, and a
spring-loaded telescopic column connected with and extending
upwardly from the base. The column includes an outer tube having a
lower end which is secured to the base and also having an upper
end. A turnable inner tube extends through the upper end and is
provided with a conical free end portion having a lower and an
upper section. A discrete armrest unit comprises two
mirror-symmetrical shaped tubular elements having respective
farther-spaced outer ends bridged by armrests, and closer-spaced
center portions bridged by a connecting plate which is provided
with a conical opening arranged to receive the lower section so as
to releasably connect the unit with the column. A seat unit
includes a seat, backrest extending upwardly from the seat, a
socket at the underside of the seat and having a conical recess
arranged to receive the upper section of the free end portion of
the inner tube, so as to releasably connect the seat unit with the
column. Further, the seat unit includes a projection which engages
one of the tubular elements to thereby prevent relative angular
displacement of the armrest unit and seat unit.
Due to the fact that the armrest unit is provided as a discrete
unit it can be installed or removed in toto when the chair is to be
converted to an armchair, or when it is to be converted to a chair
having no arms. Because the armrest unit is so constructed that the
tubular elements are symmetrical it is clear that the armrest unit
will always have the proper orientation with respect to the seat,
irrespective of how it is connected with the telescopical column.
The wedging action obtained in the conical connections between the
telescopic column and the armrest unit, and again between the
telescopic column and the seat unit, eliminates any need for
separate connecting means and makes possible a connection simply by
inserting the conical free end portion into the conical opening and
into the conical recess, respectively, without requiring any tools.
On the other hand, a mere upwardly directed blow by the edge of the
hand against the seat unit and the armrest unit will usually be
sufficient to disconnect the two from the telescopic column, again
without having to resort to the use of tools. The provision of the
projection on the seat, and the engagement of this projection with
one of the tubular elements of the discrete armrest unit, assures
that relative angular displacement of the armrest unit and the seat
unit is precluded, and at the same time assures that the
once-obtained orientation of seat unit and armrest unit relative to
one another will remain until it is desired to disengage them from
one another.
Furthermore, it is advantageous according to the present invention
to provide the base with conical recess having an upright
orientation, and to provide the lower end of the outer tube of the
telescopic column with a conical portion which can be received in
this recess. Thus, the column can also be readily connected with
and disconnected from the base without requiring tools for any
particular expertise.
The novel features which are considered as characteristic for the
invention are set forth in particular in the appended claims. The
invention itself, however, both as to its construction and its
method of operation, together with additional objects and
advantages thereof, will be best understood from the following
description of specific embodiments when read in connection with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 is a side view illustrating the base of the novel chair;
FIG. 2 is a side view illustrating the spring-loaded telescopic
column of the chair;
FIG. 3 is a side view illustrating the seat of the seat unit for
the chair;
FIG. 4 is another side view illustrating the backrest part of the
seat unit;
FIG. 5 illustrates in a side view the discrete armrest unit of the
chair;
FIG. 6 is a top-plan view of the armrest unit shown in FIG. 5;
and
FIG. 7 is a fragmentary longitudinal section illustrating a detail
of the connection of the armrest unit with the tubular elements
thereof.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the drawing we have illustrated a single exemplary rotary
armchair according to the present invention, with FIGS. 1-5 each
illustrating a portion of the armchair, FIG. 6 illustrating a
top-plan detail view of the portion shown in FIG. 5, and FIG. 7
showing a fragmentary detail view of the portion in FIGS. 5 and
6.
It will be seen, be referring to the drawing, that the telescopic
column is composed of an outer tube 2 and an inner tube 3 which
extends upwardly through the upper open end of the outer tube 2.
The column is spring-loaded, which can be achieved in a manner well
known from the art and therefore requiring no further discussion,
by inserting a so-called gas spring into the interior of the
column. An operating pin 6 is provided, which when depressed opens
a valve provided in the piston of the gas spring and unblocks the
piston of the latter so that the piston can move. The gas spring
resembles a shock absorber in its construction and operation. When
there is no weight on the telescopic column, the inner tube 3 will
slide upwardly upon depressing of the pin 6 until the latter is
disengaged, causing the valve in the piston of the gas spring to
close and thus to block the further movement of the piston. If the
telescopic column is subjected to a load, the inner tube 3 slides
into the outer tube 2 until the valve again is closed.
It is emphasized that the construction and operation of the gas
spring itself does not form a part of the present invention and is
well known per se from the art. It is mentioned here only for
purpose of explanation, and no claims are made as to its
features.
The outer tube 2 of the telescopical column is provided with a cone
5 which can be inserted into a corresponding bore located centrally
in the cruciform base 1. The outer ends of the projections of the
base are provided with adjustable casters 21, advantageously dual
characters. The upper free end portion of the outer tube 3 is also
provided with a cone, identified with reference numeral 4.
Before discussing further details of the assembly attention is
directed to FIGS. 5 and 6, it will be seen that the discrete
armrest unit which forms a part of the rotary armchair according to
the present invention is designated with reference numeral 13 and
has to symmetrical shaped tubular elements 17 and 18. The outer
free ends of the elements 17 and 18 (only one of elements 17 shown)
are, as seen in FIG. 7, received in passages provided at the
opposite ends of armrests 14 in which they are received under
pre-stress. In these passages they are retained against
displacement by pins 20. Reference numeral 19 designates padding or
upolstery on the armrests 14.
In the center region intermediate their respective outer ends the
tubular elements 17 and 18 are closest together and are there
bridged by a sheet-material (preferably sheet metal) plate 15 which
is welded to them. At the center of the plate 15 is a conical
opening 16 which can receive the lower section of the conical free
end portion 4 at the upper end of the outer tube 3 of the
telescopical column. The upper section of the free end portion 4
will then project upwardly beyond the plate 15. When the chair is
assembled to this extent, then the seat unit is secured to the
column. For this purpose the seat 7 is provided at its underside
with a socket 7a having a conical recess arranged to mate with the
upper section of the conical free end portion 4. Thus, the seat 7
is then connected with this upper section, that is the section
which projects upwardly beyond the plate 15. The seat is provided
with a laterally projecting extension or tongue 23 which, when the
seat 7 is connected with the column in the manner just described,
will engage one of the tubular elements 17 and 18 so as to prevent
any undesired changes in the angular orientation of the seat unit
and armrest unit with reference to one another.
Diagrammatically illustrated, because it does not form a part of
the invention, is an operating button 8 by means of which a user
can operate the pin 6 which in turn actuates the valve of the gas
spring; reference numeral 22 similarly diagrammatically identifies
an operating button for a further gas spring permitting an
adjustment in the inclination of the seat back or backrest 12. Of
course, there must be transmission members connecting the buttons 8
and 22 with the pin 6 and a corresponding pin for the second gas
spring, and these transmission members also do not form a part of
the present invention but should be understood to be located in the
interior of the seat 7.
The backrest 12 has a carrier 11 which is insertable into a recess
between the clamping device 9 composed of two shell sections which
can be so drawn together via an adjusting screw 10 as to retain the
carrier 11. The latter can thus be fixed in the clamping device 9
at any desired level. The device 9 is eccentrically mounted on the
seat 7 and its position and thereby the inclination of the backrest
12 can be changed by operating the gas spring mentioned above which
is not illustrated but which will be actuated by depressing the
button 22.
In addition to the advantages obtained with the present invention
and outlined above, there is the further advantage that a rotary
armchair such as illustrated in FIGS. 1-7 can be readily
manufactured but requires no assembly of its constituent components
to one another, namely of the column to the base, of the armrest
unit to the column, or of the seat unit to the column. These
various components can all be supplied in unassembled condition to
a user. This not only cuts down on the assembly operations at the
manufacturer, and thereby reduces the manufacturing expense, but
also permits a simpler packing of the components for shipment, and
a manner of packing which requires less shipping space. On the
other hand, the assembly of the various components by the user is
so simple and requires no tools or expertise at all, that it is
possible without any difficulty to expect a user to assemble the
components himself.
It will be understood that each of the elements described above, or
two or more together, may also find a useful application in other
types of constructions differing from the types described
above.
While the invention has been illustrated and described as embodied
in a rotary armchair, it is not intended to be limited to the
details shown, since various modifications and structural changes
may be made without departing in any way from the spirit of the
present invention.
Without further analysis, the foregoing will so fully reveal the
gist of the present invention that others can by applying current
knowledge readily adapt it for various applications without
omitting features that, from the standpoint of prior art fairly
constitute essential characteristics of the generic or specific
aspects of this invention and, therefore, such adaptations should
and are intended to be comprehended within the meaning and range of
equivalence of the following claims.
* * * * *