Патент USA US2128210код для вставки
Aug. 23, 1938. u. k. JOHANNSEN 2,128,210 FOLDING TABLE Filed July 17, 1936 lll_l_l l INVENTOR. U0 0 K. Jo/m lwvs EM, ' ATTORNEY. Patented Aug. 23, 1938 2,128,210 UNITED STATES PATENT OFFICE 2,128,210 FOLDING TABLE Udo K. Johannsen, Cortland, N. Y., assignor to The Brewer-Titchener Corporation, Cortland, N. Y., a corporation of New York Application July 17, 1936, Serial No. 91,023 4 Claims. Fig. 1 represents an elevational side view of an tables of the fully automatic type and is more particularly concerned with a collapsible iron ing board stand comprising a three legged chassis 5 in which the legs are adapted to compactly fold erected ironing board assembly equipped with my ?atwise underneath one face of such board and to be manipulated in a simple manner. A pair of complementary or so-called rear legs have one end thereof directly pivoted to the top 10 board and a single inclined or so-called front leg may be similarly attached in substantial alignment with the axis of the rear leg pivots. All my rigid legs are positively actuated in unison between their respective erected and collapsible 15 positions by the use of a novel actuating gear. Such controlled movement is herein brought about by a manipulative primary toggle linkage of which one free link end is pivoted to the rear leg structure intermediate the ends thereof and the other free end of which linkage is pivoted underneath the board. The inclined front leg is in turn pivotally hooked up by an auxiliary toggle linkage that extends between said rear leg structure and the ?oor contacting end of the 5 front leg. Stop means prevent said auxiliary linkage from reaching full toggle alignment in both the col 24) lapsed and erected table positions. By this means, the primary linkage may be freely ma nipulated through a wide angular range Without being stalled by its cooperating linkage. i. . bottom view of my chassis when fully collapsed. 5 Figs. 5 and 6 are fragmental details respec tively taken along lines 5—5 and 6—~t of Fig. 1. Referring more speci?cally to- the drawing, the numerals l0 and Il respectively designate a pair of laterally spaced rear legs. The upper end of each such leg is pivoted at l2 to one board face l3. An intermediate pivot I4 is also located be tween the respective ends of each rear leg. This rear leg structure is preferably of a type in which the ?oor contacting ends are widely spread apart into the Fig. 2 position when the chassis is unfolded. To this end, I may resort to complementary brace straps such as l5 of which one end is pivoted to a rear leg while each oppo site strap end is pivotally attached by a metal bracket to said one board face at l6 but in an ax ially offset relation to the corresponding rear leg pivot l2. When collapsed, the rear legs will then fall within the board width con?nes in the Fig. 4 manner. like links such as ll having one of their respec tive free ends attached to an associated interme diate pivot M, as shown. The opposite link ends are pivotally adjoined at ill to a common guide is especially suited for an understructure com sion 2| arranged to thrust as a prop agency prising wooden slats that may be operatively in terconnected by simple hardware. Each such rigid table leg combines ample stiffness with low chassis weight that shall not prove burdensome against the board face in erected leg position. The guide link extension 22 is thereby kept spaced outwardly away from said face» and its terminal preferably provided with a cleared loop or ?nger piece 23 by which to swing the link l9 through a wide angle of approximately 180° into its folded position 18’. If preferred, the spaced to women when carried to or from a storage closet. The object of the present invention is to pro " vide for a sturdy folding table of the character indicated and one possessing comparatively few essential pivotal points that are not likely to be come rickety from wear after extended use or al low the superstructure to sway abnormally under 25 My primary or rear leg toggle linkage is of the jack-knife type and may comprise a pair of strut tacting leg ends simultaneous with the unfolding thereof, The actuating gear herein resorted to about a lateral spread on part of the floor con .15 devices, and Fig. 2 is a rear end View thereof. Figs. 3 and 4 respectively, show a side and a link 19, preferably made out of a strip of wood and the free end of which guide link is pivoted to the board face at 20. The pivot i8 is purpose ly disposed between the ends of such adjo-inecl toggle links to provide for a strutlike link exten In addition, my pair of rear legs are equipped with pivotally offset brace straps which bring .7 (Cl. 38—119) My invention broadly relates to portable folding link extension 22 may as a handle, be directly 45 grasped to perform a like function. The inclined front leg 24 may be pivotally at tached to the board coincident with the rear leg pivot I2. As depicted in Figs. 2 and 4, said wood its anticipated loading. My table improvements en front leg may be bifurcated by the use of . are further designed for rapid fabrication on an extensive scale at a low productive cost. Reference is had to the one sheet of drawings which are illustrative of a preferred exempli?ca companion slats of which the branched ends re spectively lead to one of the complementary piv ots l2 (see Fig. 4). A foot pivot 25 is located closely adjacent to the converging lower or ?oor tion and in which drawing: contacting end of the leg 24. An auxiliary toggle 55 2 2,128,210 linkage of the collapsible type interconnects said lapsible toggle linkage is not dependent upon the pivot 25 with the intermediate pivot ill and as such, may comprise a pair of relatively short use of a loose ended tension rod of the conven link components 26 and corresponding relatively long or tension rod components 271 that are jointed at 28, preferably by the use of a loose slot connection. As indicated in Fig. l by a dotted and dashed reference line A, the components of said auxil 10 iary linkage when extended, are prevented from reaching their respective aligned dead center po sitions by the use of a common stop lug 2e. Such Other advantages inherent in my table chassis are believed apparent to those skilled in this art, it being obvious that the same underlying struc tural principles may be used in associations other 0 than for ironing boards, and that various modi fications in design may readily be resorted to in likewise carrying out the illustrative embodiment, abut the front leg. The linkage thereby obviates a stalling of the primary linkage when the erected table legs are to be collapsed and said stop lug precludes such buckled toggle dropping through particularly pointed out in the appended claims. all without departing from the spirit and scope of my invention, heretofore described and more my complementary tension links 2i out of a one I claim: 1. In a collapsible table or the like adapted to unfold into erected position, a top board, a front leg having one end region pivoted to one board 20 face, a foot pivot carried by the opposite end region of the front leg, a rear leg structure also piece metal rod that is given a bail shape (see Figs. 4 and 5) of which the intermediate nose means located on said structure between the ends table legs be turned upside down during the fold 20 ing thereof. ' As a further feature, it is preferred to form portion 28 is threaded through the link slots while the bail terminals are each outturned into headed trunnions (see Fig. 6) that respectively constitute the intermediate pivots M. The end 30 forwardly overhanging loop 23. lug preferably spans the links 26 and is made to the alignment position A even should the erected 25 tional slip type likely to become entangled when a collapsed table is carried about. When folded, the board may be conveniently hung up by the of the wooden link I1 may be metal sheathed by an apertured cap 30 to reduce trunnion wear. The mode of folding my table legs is indicated by dotted lines in Fig, 1. In erected table posi tion, the guide link I9 is directed rearwardly toward the pivot l2 and this brings the link ex tension 25 into abutment with the board face 35 I3. The primary linkage then stands buckled through its dead center position and by virtue of the ?xed bracket pivot 28, the rear legs l0 and l I will be rigidly held against collapse. The extended auxiliary toggle becomes tensioned when the ironing board is loaded downwardly but the linkage components are not allowed to assume extended alignment because of the stop ‘lug 253. The weight of the toggle links 26 and 2'! are kept relatively light so as not to draw; the 45 front and rear legs together. When erected, the board is kept exceptionally rigid under load, partly because the foot pivot 25 is located near the floor contacting end of the inclined leg 24 rather than in the mid region thereof where a pivoted to the board face, supplementary pivot thereof, a primary toggle linkage including a strutlike link which intermediate its ends is piv otally jointed to one terminal region of a manipu lative guide link to provide for a strutlike link extension, one end of the strutlike link being mounted on the supplementary pivot and the op‘ posite terminal of the guide link being pivotally attached to said face to permit of swinging the jointed end of the guide link between extreme shift positions respectively lying alongside said face forwardly and rearwardly of such pivotal at tachment, the strutlike link extension being dis posed to thrust against the board face to retain the erected rear leg structure against collapse when the toggle linkage assumes a rearward posi tion and which extension spacedly holds the jointed end of the guide link away from said face, a cooperative auxiliary toggle linkage comprising a pair of jointed links pivotally suspended be tween the foot pivot of the erected frontleg and the retained rear leg structure, and stop means in terposed between the front leg and one such sus pendedlink serving to prevent toggle alignment with the other suspended link, the toggle joint of such auxiliary linkage being arranged to au tomatically recede from said face when the guide certain amount of lateral flexure would be ex link is swung away from its extreme rearward pected. position. A grasping of the ?nger piece 23 allows the link Hi to be swung into its dotted depending posi tion of Fig. 1 when the auxiliary linkage will par tially collapse as shown in dotted outline and thereby carry the front leg toward the board in unison with a similar rear leg movement. When the primary toggle joint i8 reaches its outer most position i8’, the understructure assumes the 60 folded Fig. 4 position. In that relationship, the stop lug 29 abuts a portion of the front leg 24 and again prevents the secondary toggle from reaching its inverted dead center position; hence, the linked understructure is kept free to unfold by a reversal of the described guide link move ments without any interlocking effects. A noteworthy attribute of the present table structure lies in its relatively simple linkage 70 adapted to automatically unfold from a central ized manipulative point such as the link l9, and still bring about a spreading of the rear legs. In erected position, the several legs are automat ically retained without need of any supplemen 75 tary latch device. In addition, the auxiliary co-l 2. In a collapsible table or the like adapted to unfold into erected position, a top board, a front leg having one end pivoted to the board, a footv pivot on the opposite end region of the front'leg, 'a rear leg structure also pivoted to the board, supplementary pivot means located between the ends of said structure, manipulative link means extending between the supplementary pivot and the board serving to guide the rear leg structure from collapsed into a retained erected position, a cooperative toggle linkage comprising a pair of jointed links pivotally suspended between the foot pivot of the erected front leg and the re tained rear leg, and stop means for one such sus pended link serving to prevent toggle alignment with the other suspended link, the interposed toggle joint thereof being arranged to automati cally recede from said face and being operative by the manipulative link means toinitiate a col lapsing movement on part of the several erected legs. ' 3. In a collapsible table or the like adapted to unfold into erected position, a top board, a front (Hi 3 2,128,210 leg having one end region pivoted to the board, a foot pivot on the opposite end region of the front leg, a structure comprising a pair of rear legs also pivoted to the board, a supplementary pivot located between the respective ends of each rear leg, manipulative link means extending between the supplementary pivots and the board serving to guide said rear legs between collapsed and erected positions, and a toggle linkage disposed 10 between the foot pivot and said pair of rear legs whereby the front leg is actuated in unison with the guided rear legs, said linkage comprising a pair of jointed link components of di?erent lengths of which the free end of the shorter link 15 component is mounted on the foot pivot and the free end of the longer link component is given a unitary bail shape of which the bifurcated terminal regions are respectively attached to a different rear leg and arranged to constitute the 20 aforesaid supplementary’pivots thereof and the medial nose region of which bail pivotally engages the other end of the shorter link component to constitute the toggle joint of such linkage. 4. In a collapsible table or the like adapted to 25 unfold into erected position, the combination of a top board, a front leg having one end region pivoted to one board face, a foot pivot carried by the opposite end region of the front leg, a rear leg structure also pivoted to said board face, supplementary pivot means located on said struc ture between the ends thereof, a primary toggle linkage including a strutlike link having one end pivotally jointed to one terminal region of a manipulative guide link, the other end of the strutlike link being mounted on the supplemen tary pivot and the opposed terminal of the guide link being pivotally attached to said face to per mit of swinging the jointed end of the guide link through its aligned dead center into a buckled 10 toggle position lying rearwardly of such pivotal guide link attachment and wherein said toggle linkage serves to retain the erected rear leg structure against collapse, a cooperative aux iliary toggle linkage comprising a pair of jointed 15 links of di?erent lengths pivotally suspended be tween the foot pivot of the erected front leg and the retained rear leg structure, and stop means operatively interposed between the shorter link and said front leg serving to prevent toggle align 20 ment with the longer link, the stop means being disposed to automatically recede from said face when the guide link is swung away from its buckled position and the respective linkages be ing so arranged that the primary linkage when manipulated cannot become stalled because of link alignment on part of the auxiliary linkage. UDO K. J OHANNSEN.