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Патент USA US2405013

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July 30, 1946~
J. A. CAMPBELL
2,405,013
CHAIR
Filed Nov. 19, 1942
2 Sheets-Sheet 1
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@l
5’ INVENTOR.
BY
ì ' July 30, 19'46.
2,405,013
J. A. CAMPBELL
CHAIR
Filed Nov. 19, 1942
Il
2 Sheets-Sheet 2
/`
INVENTOR.
James ¿L áìüîïzübélß,
BY
~
ß
I
`
Patented July 30, 1946
2,405,013
UNITED STATES PATENT OFFICE
2,405,013,
CHAIR
James A. Campbell, Adrian, Mich., assignor of
one-half to Charles T. Campbell,_ Adrian,
Mich.
‘
Application November 19, 1942„ Serial No. 466,103
5 Claims.
(Cl. 155-94)
1
2
The present invention is directed to certain im
provements embodied in supports such as pedes
Fig. 3` is a cross-sectional view- taken substan
tially along the line 3-3 in Fig. 2.
tals and legs for stools, chairs, tables and other
Fig. llis a transverse cross-sectional view taken
substantially along the line 4-4 in Fig. 2.
similar articles. More speciñcally the invention
is directedk to adjustment features embodied in Ci
Fig. 5 is another transverse cross-sectional
view taken substantially along the line 5--5- in
such columns or legs for the various articles re
ferred to.
Fig. 2, and
Fig, 6 is a modiñed illustration of a fragmen
Heretofore various constructions have been uti
tary portion of the chair column showing a mod
lized inA providing extensible members for varying
ified form of spring for >latching the holding link
the heights of seats of chairs and stools, and
and for maintaining the same in operative en
other articles or for varying the heights of table
gagement with the notches in the movable
tops or similar articles, but the present construc
tion has as one of its main objects the provision
column.
Referring to Fig. 1 of the drawings, the chair
of cooperative mechanisms embodied by way of
comprises a column I supported'upon the suitable
example in a single column o_r pedestal for a chair
legs 2 and 3 which are adapted to cross through
and wherein the greater percentage of the entire
suitably positioned groovesprovided in the bottom
chair and its associated parts are primarily made
portion of the column. A seat 4 with' an asso~
of'non-metallic materials such as wood, ?lber,
plastics, etc., orco-mbinations thereof.
Another of‘ the objects relating to the preferred
form of construction herein disclosed and de
scribed is the provision of improved means for
positively locking the relatively movable members
which provide the extensible support or column.
The locking means will positively prevent col
lapse of the relatively movable members under
load and at the same time such members incor
porate means for permitting free movement of
said members in one direction to raise the eleva
tion of the seat height and also incorporate co
operative actuating means for releasing the lock
ing mechanism to permit relative movement of
the members in either direction for resetting the
chair in its lowermost position at which stage one
of the actuating means functions to restore the
locking means to a position for again actively
locking said relatively movable members against
collapse of the chair.
,
All other objects and advantages associated
with the detailed construction and improvements
embodied in the stool of the present invention will
hereinafter be pointed out in the following de
tailed description having reference to a preferred
embodiment of chair as illustrated in the accom
panying drawings.
In the drawings:
Fig. 1 is a front elevational View of a chair in
corporating a preferred form of improved column
or support for maintaining the height of the seat r
in various elevated positions.
Fig. 2 is a vertical cross-sectional view taken
substantially along the line 2-2‘in Fig. 1 to illusn
trate> in detail the mechanisms associated with the
ciated back 5 and back supports are all suitably
fastened to the seat base 'I fixedly secured to the
movable column or support 8. The column or
support I for the chair provides the fixed mem
ber, while the column or support 8 for the chair
seat is the movable member, and hence, it is
obvious- that the members l and 8 may be con
sidered as relatively movable members when taken
together and in their telescopic relationship.
Referring more particularly to Figs. 2-and 3, it
is to be noted that the column I is divided into two
cooperating sections I0 and II which together
provide a common opening I2 for the reception of
the movable column or support 8. The latter is
preferably of square construction and the opening
l2 is also square to receive the column 8 whereby
column I and column 8 are prevented from rela~
tive rotation with respect to each other.
One face I3 of the column 8 is provided with a
plurality of notches I4 that are adapted to coop
erate with and receive one end of a link l5 which
is pivotally supported at I6 in the section Il of
the fixed column I. The link I5 extends about
the square column 8V and will normally engage
the face I3 of the latter column through gravity
and obviously will lie within one of the notches
I4 substantially in the manner shown in Figs. 2
and 3. Whenever column 8 is moved from the
position shown in the drawings and relatively to
the column l to the limit of> its upward move
ment as determined by the bottom-most notch,
certain other mechanisms will determine the
practical limits of movement of the column 8
relative to the column l as hereinafter explained.
In Fig._3, the upper end of the link I5 which is
two relatively movable members of the extensible 55 pivoted, as at IB, rests in the slot Il traversing the
upper face of section Il of ythe columnzl, and a
chair column or support.
eficacia
3
suitable wooden insert I8 is pressed or otherwise
secured within the slot i1 to hold the link I5 in its
proper pivotal position. Also, the horizontal por
tions of the link I5 may be provided with suitable
sleeve rollers such as I5 and 28 if desired to in
sure greater freedom of operation of the link I5
in the capacity for which it was designed.
To further accommodate the swinging move
ment of the link I5, the upper end of the sections
I8, II of the column I are suitably cut out as at
2l and 22 (see Figs. 2 and 4) to provide clearance
for the side arms of the link I5 as the latter
swings about its pivot IS.
The section Il! of column I is also provided
with a recess 23 substantially of the shape shown
at the upper end thereof to accommodate the
freely swingabl-e end of the link I5 as the lat
ter is moved about its pivot I6 during the oper'
ation of the chair. An additional slot 24 is cen
trally located with respect to the axial center of
the chair column'an'dj also centrally with respect
to the recess or cavity -23 and this slot 24 is
adapted for accommodating the leaf spring mem
ber 25 suitably secured to the bottom of the
its bottom-most position within the column I.
When the chair is in this position, as best shown
in Figs. 2 and 3, the seat may be adjusted ver
tically by increments as determined by the spac
ing the notches I4 by lifting or raising the seat
4. Through this action, the cam portions 43
of the notches I4 act to engage the sleeve roller
I9 and to swing the link I5 about its pivot I6
and into the recess 23 in the section I2 of the
column I. As each successive notch approaches
the link, the latter will drop into place and when
the desired seat elevation is reached the link I5
will act to firmly support the column 8 through
the side portions of the link and on its pivotal
end I5 nested in the upper end of the section II
oi column I. This provides the very strong hold
ing means for preventing relative movement of'
the members I and 8 in a direction to collapseA
the chair or its eXtensible column. Also, the
tensional stresses imposed on the column 8 bythe reaction of the link I5 within the particu-~
lar notch I4 in which it lies will be stronglyl
counteracted in view of the fact that the link
I5 is located about the column 8 and the greatery
portion of the cross-sectional area of the column.
8 is disposed within the link and in the line of.
slot‘by means of screws such as 28. Spring 25
is provided with a latch portion 21 which acts
force between the horizontally extending portions;
to hold the outer end 28 of the link I5 in the
I5 and 28 of the link I5.
raised Iposition shown in dotted lines in Fig. 2
Whenever it is desired to reset the chair height;
whenever the link is forced to snap beyond the
latch portion 21 of the spring and out of the 30 and the columns I and 8 for again adjusting the;
elevation of the seat 4 of the chair, the seat 4 and:
path of the movable column 8 and its associated
the column 8 may be lifted to their maximum,
notches I4.
height which is determined by the ends of the
The upper end of the column I is closed by
lower pin S1 striking against the swingable side.
means of the cap 32 secured to said column by
means of the relatively thin strap 3i as by means CAD Ul legs of the link I5 and this action causes the`
link to snap into its dotted line position in Fig. 2;
of the screws 32> and 33 which pass through the
past the latch portion 21 of the spring 25. The
strap and into the cap 38 and column I, respec
link will be retained in this position entirelyv
tively'.- Obviously, the strap 3| may be of a
out of the path of movement of the column 8:
single piece or may overlap as at 35 in Fig. 4 with
the ends thereof secured in place by means of the 40 within the column I, thereby allowing the column.
8 free movement within the column I inasmuch~
screws _34.
»_
'
as no coo erative engagement will then resultv
The square column 8 is provided with the
between the end 28 of the link I5 and any one'.
spaced pins 35 and 31 whichmay be of fiber or
of the notches I4. By then allowing the column`
other suitable material and which extend through
8 to drop or to be moved downwardly toward.
the >column with their ends projecting beyond
its lowermost position, the projecting ends of the.
each side face of the columnand substantially
upper pin 36 will then strike the swingable legsalong axes parallel to the direction of the notches
of the link I5 to again cause the latter to snap:
I4 as illustrated. To accommodate the project
ing‘ends of the pins 35~and 31, the sections I0 and
beyond the latch portion 21 of the spring 25'.
I I ofthe column I are provided with common 50 Link I5 will then swing against the side face
I3 of the column 8 by gravity and into the upper
slots 3S and 39 which extend the full length of
most notch i4 so positioned and arranged to re
_the movement of said center column 8 and which
ceive the end 23 of the link I5 when members
terminate in the cavity at the upper end of col
I and 8 are in their maximum telescoped and
umn I that accommodates the link I5. The cap
Eil is also provided with diametrically located 55 nested positions. Adjustment of the seat height
of the chair may then again be effected by mov
slots> 40 and 4I to permit the passage of the
ing the column 8 relative to the column I by
projecting ends of the pins 3S and 31 during the
raising the seat 4 to any desired position suited
assembly of the chair or in the event that re
These notches may be
for the particular use to which the chair small be
at such a height until used for a diiîerent purpose
or by a different person. Normally, when the
It is also to be noted that the legs 2 and 3 have
pairs are to be made.
omitted if desired to eliminate the possibility of 60 applied.
The present design of chair has been devised
having articles or dirt dropping into or being
to provide an adjustable article of the class de
forced into the operating mechanisms of the
scribed which is substantially entirely made of
chair inasmuch as the cap 38 is removable.
non-metallic materials such as wood, fiber, plas
The operation of the extensible column of the
chair is simple and precise and obviously when 65 tics, or the like, and wherein the metallic pieces
employed are substantially reduced to an absolute
once set asto the height required by an indi
minimum.
vidual, the same will normally be maintained
been positioned substantially at 45 degrees with
column 8 is telescoped within the column I so 70 respect to the front and back plane of the chair
for the convenience of allowing a certain amount
as .to support the seat 4 in its lowermost eleva
of tilting of the chair when in use. Also, the
tion-with respect to the floor, the bottom end
notches I4 for receiving the end 22 of the link I5
of the column 3 will rest on the felt insert 42
have been disposed in a position to the rear of
at any time that the column 8 is telescoped to 75 the chair to guard against the possibility of catch
and the latter also actsV as a cushioning means
5
2,405,013
ing theclothing of the user in the notches when
the latter are exposed through the separation o
the columns I and B as described.
'
In the preferred form of construction illus
trated in Figs. ‘1 to 5 inclusive, the operation of
the link I5 depends upon gravity and for that
reason any chair or stool or other article sup
ported by means of an extensible column would
necessarily have to be disposed in positions where
in the column will normally be maintained sub
6
detent surrounding the inner member, said detent
being normally positioned by gravity in the path
of movement of the inner member, said outer
member having a recess within its interior in
which the datent is contained, and said inner
member having notches in one side thereof to
receive a coacting member of the detent, whereby
said two relatively movable members are locked
against relative motion in said one-direction, said
recess permitting said detent to be moved out of
stantialiy vertically or reasonably close thereto.
It is also possible to conceive various 'other situ
ations wherein it might be necessary to tilt the
the path of said inner member during the rela
tive movement of said members in the aforesaid
extensible column or the same might be applied
said inner member and arranged to engage said
detent when the inner member is raised a pre
determined distance, whereby to move said swing
abie detent out of the path of movement of the
inner member to permit free relative movement
of said members in either direction, other abut
ment means carried by the inner member above
the detent, functioning to swing the detent into
operative position, and resilient means carried by
in such positions wherein the link I5 Would‘nor- ,
mally be Yunable to drop into any one of the sev
eral slots I4. For this reason the modiñcation
illustrated in Fig. 6 has been added to illustrate
a more positive means for holding the link I5
against the face I3 of the column 8 or more spe- ,
ciiically within any particular notchv I4 which is
aligned with the end 28 of the link I 5 to take care
of situations as above referred to.
Therefore, to eii‘ect the positive operation of
the link I5 independent of gravity, the spring 25
in the preferred form of construction has been
replaced by a spring 45 so shaped and mounted
within-a recess 46 in the upper end of the sec
tion I0 of the column I as to normally urge the
opposite direction, abutment means carried by
the outer member functioning to yieldably hold
the detent in inoperative position.
2, In an adjustable chair, the combination of
two relatively movable telescoped members pro
viding an extensible column for supporting a
seat at various heights within certain predeter
.mined limits, a pivoted link disposed wholly with
end 28 of the link I5 into active engagement with 30 in the outer member and pivotally carried by the
the notches I4. The spring 45 in this case is
outer member and extending about the inner one
secured adjacent the upper face of the section
of said members and lying thereagainst, said
I0 of the column I by means of screws 41 or the
inner member having a plurality of notches, said
like. The free end portion 48 of the spring 45
link having one portion thereof engageable by
is made to bear against the side I3 of the column
gravity within the conñnes of any one of said
8 and regardless of the position of the pedestal.
notches whereby the telescoped members are
Whenever the column 8 is moved the link I5 will
locked against relative movement in one direc
be cammed against the straight end 48 of the
»tion to support said seat, and abutment members
spring by means of the cam surfaces 43 of the
carried by the inner member, one above and one
notches and the spring section 48 will force the 40 below said link, one of which is arranged to move
link into the next succeeding notch when the
said link out of the path of movement of the
latter is brought in line with the link end 28
inner member when a deñnite seat height is at
of the link I5. The spring 45 is also provided
tained and the other acting to restore the link to
with the curved portion 49 which provides the
active locking position at another seat height
latching means for holding the link I5 when the
removed from the iirst seat height and a latch
latter is urged over the high point 50 on the
member secured to the outer telescoped member in
spring to be held out 01° operative engagement
a recess thereof and latchingly engageable with
with the notches I4 in the column 8 in the same
said link when the latter is moved upward.
manner as in the preferred form of construction.
3. In an adjustable chair, the combination of
The foregoing description as relating to the pre 60 two relatively movable telescoped members pro
ferred embodiment of the present invention as
viding an extensible column for supporting a seat
disclosed in the drawings may obviously permit
at various heights within certain predetermined
of various modiiications which presumably will
limits, a link wholly within and pivotally car
not depart from the general scope and ñeld of
ried by the outer one of said members and ex
the present invention. Hence, it is to be under*
tending about the other member and lying there
stood that the present extensible means as incor
against, said other member having a plurality of
porated in a chair, stool, or the like, is not to be
notches, said link having one portion thereof en
gageable by gravity Within the coniines of any
limited to the exact form, construction, arrange
ment or combination of parts as specifically re
one of said notches whereby said relatively mov
ferred to and described or to the particular uses
able members are locked against relative move
mentioned.
ment in one direction to support said seat, abut
What I claim as new and desire to secure by
ment members carried by the inner one of said
Letters Patent is:
movable members, one above and one below said
l. In an adjustable chair or the like, the com
link and operating to move said link out of the
bination of two relatively movable telescoped 65 path of movement of said other member When a
members coacting to support a chair seat, con
deñnite seat height is attained and to restore the
cealed retaining means connecting said members
link to active locking position at another seat
to lock the same against relative movement in
height removed from said first seat height, and a
one direction and to allow said members to be
spring latch secured to one of said members and
relatively moved in the opposite direction to ad 70 functioning to hold said link out of locking posi
just the supported height of the seat, said re
tion with respect to said members until restored
taining means comprising a swingable detent dis
to active locking relation thereto.
posed wholly within the outer member and piv
4. In an extensible support, the combination
otally carried by the outer member on a fulcrum
of a pair of telescoping members adapted for
disposed at one side of the inner member with the 75 relative movement and having a relatively close
2,405,013
7
iit therebetween, retaining mechanism coacting
between said members to lock the same in certain
relative positions to prevent the diminution of
the overall length of said telescoping members,
said retaining mechanism comprising a swingable
detent contained within and swingable within
a recess in the outer member and surrounding
the inner member, said detent having one end
pivotally connected with the outer member and
adjacent one side of the inner member, the other
end of said detent being adapted to engage the
other side of the inner member, said inner mem
ber having notches in the side thereof engaged
by said detent to allow said other end of the de
tent to position itself in the path of movement `
of said inner member whereby relative movement
of said telescoping members in a direction to de
crease the overall length of said members is pre
vented, said notches having sloping edges coop
erating with said detent to permit said telescop
ing members to move apart to adjustably increase
the overall length of the combined members,
abutment means carried by the inner member
adapted to engage and swing said detent out of
the path of movement of the inner member when
the latter is raised to a predetermined height for
rendering said retaining mechanism inoperative
to prevent the diminution of the overall length
of said combined members, whereby said length
may -be readjusted, other abutment means car- il
ried by the inner member for restoring the de
tent to its normal position for again preventing
diminution of the overall length of the combined
members, and a spring latch carried by the outer
member for yieldably holding the detent in in- '
operative position.
5. In an extensible support, the combination of
a pair of telescoping members adapted for rela
8
tive movement, retaining mechanism coacting be
tween said members'to lock the same in certain
relative positions to prevent the diminution of
the overall length of said combined members,
said retaining mechanism comprising a swing
able detent contained Wholly within and having
one end pivotally connected with one of said
members and adjacent one side of the other
member, the other end of said detent extending
across and engaging the other side of said other
member, and there being notches in the side of
said other member to allow said other. end of
said detent to position itself in the path of move
ment of said notched member, whereby relative
movement of said telescoping members in a di
rection to decrease the overall length of the com
bined members is prevented, said notches hav
ing inclined edges to permit said detent to pass
from notch to notch and thereby permit said
telescopìng members to move apart to adjust
ably increase the overall length of the combined
members, and means for rendering said retaining
mechanism inoperative to prevent the diminution
of the overall length of said combined members,
said means comprising latch means to hold the
detent out of the path of movement of said other
member, said latch means including a spring arm
for normally urging said detent into locking re
lation with said other member when said retain
ing mechanism functions in the capacity of pre
venting the diminution of the overa11 combined
length of said members, and upper and lower
abutment means carried by the notched member,
the upper abutment means adapted to release
said detent from the spring latch, and the lower
abutment means adapted to engage said detent
with the latch.
JAMES A. CAMPBELL.
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