Патент USA US2137335код для вставки
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.