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Патент USA US2137335

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Nov. 22, 1938.
‘
A. H. GABB
CHAIR, SEAT, AND THE LIKE
Filed July 16, 1937
2,137,335
Patented Nov. 22, 1938
2,137,335
umrrse STATES rare-Ni" orrice ‘
CHAIR,‘,SEAT, AND THE LIKE
Archibald Hors?eld Gabb,.B1-istol, England, as
» signor to The Tan-Sad Chair Company (1931)
Limited, Birmingham, England, a British com
,
pany
Application July 16, 1937, Serial No. 154,009
In Great Britain August 21, 1936 ,
2 Claims. (01. 155—-157)
The present invention has relation to chairs, under-frame a of the seat, which U-shaped mem
ber protrudes rearwardly and has associated
seats, and the like, more particularly the back
rests or back supports thereof. In the prior with its limbs the clamping means hereinafter
5
patent speci?cation No. 1,860,096, May 24th,
referred to.
1932, Headley-Assignees: The Tan-Sad Chair
Company (1931) Limited, there is disclosed a
backrest supporting mechanism of an adjust
able character comprising a rearwardly protrud
nular radially toothed or serrated element b
ing bifurcated support, an annular radially ser
rated element attached to one bifurcation which
is adapted to co-operate with an oblong serrated
element having a channel or slideway and a
spigot rotatable in a blind aperture in the bi
furcation aforesaid, an upright arm supporting
‘T the backrest slidable in the channel or slideway,
and a hand screw member in the second bifur
cation adapted to bear against the arm and se
cure same in position after the desired rotary
and sliding adjustment has been made.
The present invention is concerned with ad
justment means of a somewhat similar character
to the aforesaid, and has for its object primarily
to reduce cost and simplify construction, and
accordingly there is provided adjustment means
for the backrest of a chair, seat or the like where
in a ?xed annular radially toothed or serrated
element and a co-operative toothed or serrated
element for the sliding association of a backrest
arm engageable by hand screw fastening means,
are stamped up from sheet metal to shallow dish
or tray formations, the metal teeth being raised
advantageously with appropriate slitting, each
element being slotted in the instance of the an
nular element, for engaging its carrier member,
' and in the instance of the co-operative serrated
element,_ for engaging the supporting arm.
In order that this invention may be clearly
understood and readily carried into practice,
reference may be had to the appended sheet of
40 drawings upon which:
Figure 1 illustrates adjustment means for the
backrest of a chair constructed according to the
Attached to one limb a1 is the an
(Figure 4). This element is stamped up from
sheet metal to a shallow cup or dish formation,
the wall of which is slotted at two points b1
to engage the one limb of the U-shaped carrier
member al. The element is riveted in position at 10
172. The teeth b3 are raised in the pressing op
eration by appropriate slitting and are advan
tageously of a ratchet or one-way character.
The co-operative serrated element 0 Figure 4:
is of oblong formation stamped up to a shallow 15
tray construction, teeth 01 of a ratchet character
being provided by slitting and raising at the ex
tremities of the element. The walls of this ele
ment are slotted at the extremities c2 for the
sliding reception of a supporting arm 01 which
may be of rectangular tubing, and centrally this
element 0 is provided by riveting with a stub
axle c3 which is adapted ‘to co-operate with a
central aperture 174 in the ?xed element b, a com
pression spring if desired being interposed be 25
tween the elements for normally urging them
apart. Each of the elements b and c in this in
vention is therefore primarily of a sheet metal
character, the teeth being raised from the sheet
metal, these features primarily differentiating
the present invention from that disclosed in the
prior patent speci?cation No. 1,860,096 afore
said where castings are employed. The opposite
arm of the U-shaped supporting member a1
is provided upon its inner face with a channel
shaped strengthening bracket e having a sleeve 61
protruding through an aperture in the arm con
cerned, and within this boss a screw pin I having
a handle I1 is rotatably mounted. This screw pin
is adapted to engage the supporting arm d and
lock same in position after adjustment has been
obtained by sliding and relative setting of the
present invention.
toothed or serrated members I)1 and 0. Instead of
Figure 2 is a sectional plan View taken on line
2—-2 of Figure 1.
forming ratchet teeth by slitting, interengage
Figure 3 is a sectional elevation taken on line
ments by pressing, without any slitting opera
tion.
I claim:--
3-3 of Figure 1.
Figure 4 illustrates in perspective primary
components of the clamp hereinafter referred to.
Figure 5 illustrates in sectional plan view the
connection of the adjustment means with the
seat frame.
In a convenient embodiment of the present in
vention the supporting means for the clamp com
55 prises a U-shaped member (11 associated with the
able serrations may be provided upon the ele
45
1. Adjustment means for the back rest of a
chair comprising in combination a supporting 50
member having two spaced connecting limbs,
two sheet metal radially toothed elements of
shallow dish formation each having a slotted
edge wall, one of which elements is mounted on
the inside of one limb and has its slotted por
2
-
‘
2,137,335
tions engaging said limb, the other element be
ing pivotally mounted on the ?rst element in
face to, face contact therewith, a tubular sup
porting arm one side of which is engaged by the
~
slotted portions of the second element
and a
inside of one limb and has its slotted portions
engaging said limb, the other element having a
stub axle and pivotally engaging the ?rst ele
ment in face to face contact therewith, a tubu
lar supporting arm one side of which is engaged
screw pin carried by the second connecting limb
by the slotted portions of the second element, a
and engaging the opposite side of the supporting
channel shaped strengthening bracket attached
arm.
to the second limb of the supporting member, a
sleeve extending through the second limb and
bracket and a hand screw engaging the sleeve
co-operating with the opposite side of the sup
porting arm.
2. Adjustment means for the back rest of a
chair comprising in combination a supporting
member having two spaced connecting limbs, two
sheet metal radially toothed elements of shal
low dish formation each having a slotted edge
wall, one of which elements is mounted on the
ARCHIBALD HORSFIELD GABB.
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