US2137335A - Chair, seat, and the like - Google Patents

Description

Nov. 22, 1938. A. H. GABB 2,137,335

CHAIR, SEAT, AND THE LIKE Filed July 16, 1937 the backrest slidable in the channel or slideway,

' and in the instance of the co-operative serrated Patented Nov. 22, 1938 CHAIR,,SEAT, AND THE LIKE Archibald Horsfield Gabb,.B1-istol, England, as-

signor to The Tan-Sad Chair Company (1931) Limited, Birmingham, England, a British company Application July 16, 1937, Serial No. 154,009

In Great Britain August 21, 1936 under-frame a of the seat, which U-shaped member protrudes rearwardly and has associated with its limbs the clamping means hereinafter referred to. Attached to one limb a is the annular radially toothed or serrated element b- (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 b to engage the one limb of the U-shaped carrier member a The element is riveted in position at 17 The teeth b are raised in the pressing operation by appropriate slitting and are advantageously of a ratchet or one-way character. The co-operative serrated element Figure 4: is of oblong formation stamped up to a shallow tray construction, teeth 0 of a ratchet character being provided by slitting and raising at the extremities of the element. The walls of this element are slotted at the extremities c 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 c which is adapted to co-operate with a central aperture 17 in the fixed element b, a compression spring if desired being interposed between the elements for normally urging them apart. Each of the elements b and c in this invention 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 specification No. 1,860,096 aforesaid where castings are employed. The opposite arm of the U-shaped supporting member a is provided upon its inner face with a channel shaped strengthening bracket e having a sleeve 61 protruding through an aperture in the arm concerned, and within this boss a screw pin I having a handle I 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 toothed or serrated members I) and 0. Instead of forming ratchet teeth by slitting, interengageable serrations may be provided upon the elements by pressing, without any slitting operation.

I claim:---

1. 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 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 Claims.

The present invention has relation to chairs, seats, and the like, more particularly the backrests or back supports thereof. In the prior patent specification No. 1,860,096, May 24th, 1932, Headley-Assignees: The Tan-Sad Chair Company (1931) Limited, there is disclosed a backrest supporting mechanism of an adjustable character comprising a rearwardly protruding bifurcated support, an annular radially serrated 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 bifurcation aforesaid, an upright arm supporting and a hand screw member in the second bifurcation adapted to bear against the arm and secure same in position after the desired rotary and sliding adjustment has been made.

The present invention is concerned with adjustment 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 wherein a fixed 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 annular element, for engaging its carrier member,

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 drawings upon which:-

Figure 1 illustrates adjustment means for the backrest of a chair constructed according to the present invention.

Figure 2 is a sectional plan View taken on line 2-2 of Figure 1.

Figure 3 is a sectional elevation taken on line 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 invention the supporting means for the clamp comprises a U-shaped member (1 associated with the tions engaging said limb, the other element being pivotally mounted on the first element in face to face contact therewith, a tubular supporting arm one side of which is engaged by the slotted portions of the second element and a screw pin carried by the second connecting limb and engaging the opposite side of the supporting 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 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 portions engaging said limb, the other element having a stub axle and pivotally engaging the first element in face to face contact therewith, a tubular supporting arm one side of which is engaged by the slotted portions of the second element, a channel shaped strengthening bracket attached 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 supporting arm.

ARCHIBALD HORSFIELD GABB.

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