Патент USA US2405013код для вставки
July 30, 1946~ J. A. CAMPBELL 2,405,013 CHAIR Filed Nov. 19, 1942 2 Sheets-Sheet 1 mw @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.