US1938223A - Extension table - Google Patents

Description

Dec. 5, 1933.

w. o. KNAUB ET AL I 1,933,223

EXTENSION TABLE Filed Ma 14; 1931 3 Sheets-Sheet 1 1" .1 1g 4 4 4 y JJ&\\\\\\\\ 60/ 172,5 2 a L4 44 Z5 63 f Z J Z5 2 J5 4 AM! 475, 1f 46 J5 1 KW W W &

6K a I w 22 J5 20 Z4 M Z3 13 x4 0 25 3 m Z2 [0'33 M71129! Oscar [1' naab and 61 j Frederick 5. Walter 1 1 1933- w. o. KNAUB Er AL 38,223

EXTENSION TABLE Filed May 14, 1931 3 Sheets-Sheet 3 I a I I I, g 5 r gnwnfow William OJcar H275!!!) and irederick 13. Walter,

Patented Dec. 5, 1933 EXTENSION TABLE William Oscar Knaub, Mount Wolf, Pa., and FrederickB. Walter, Wabash, Ind., assignors to B. Walter & Company, Inc., Wabash, Ind'., a

corporation of Indiana Application May 14, 1931. Serial No. 537,320

7 Claims.

The'object of my invention is to produce an extension table of the fixed-center-leaf type in which the movable leaves are automatically raised to and depressed from the plane of the fixed center-top as a result of sliding movements of the extension leaves.

The accompanying drawings illustrate my invention in an embodiment where the extension leaves are to form extensions of the sides of the main top rather than the ends but it is to be understood that the extension leaves may be applied to the ends instead of the sides if desired.

Fig. l is a vertical medial section with the extension leaves in storage position;

Fig. 2 a similar section with the parts in an intermediate position toward elevated position;

Fig. 3 a similar section with the extension leaves elevated, preliminary to final use position;

Fig. 4 a similar view of the extension leaves in use position;

Fig. 5 asimilar view with the parts in an intermediate position from use position towards storage position;

Fig. 6 a similar view with the parts in fully extended position preliminary to storage assembly;

Fig. '7 a medial fragmentary section at right angles to the plane of the preceding figures;

Fig. 8 a vertical section in a plane parallel to Figs. 1 to 5 showing the slide-assembly supporting means;

Fig. 9 an elevation, full size, of one of the automatic cam mechanisms and immediately adja- 35 cent slide by which it is carried, and

Fig. 10 a horizontal section, immediately beneath the fixed top.

In the drawings indicates a suitable pedestal having a medial horizontal board 16 at the ends of which are secured upwardly extending spacer blocks 17 to the upper edges of which is secured the fixed top 18, the spacer blocks 17 being of such height as to provide, betwen board 16 and top 18, space for the slide assembly and extension leaves. Secured to the top of board 16, near each end, is a L-shaped bracket 19 to the vertical arm of which are pivoted two oppositely extended balancing levers 20, 20, the inner ends of which are connected by a pin and slot pivotal connection 21.

Pivotally suspended from the outer ,end of each lever 20 is a chair 22 and these chairs are connected in pairs, parallel with the fulcrums of the levers, by stretcher bars 23, 23 to the upper faces of which are secured the-fixed middle bars 24, 24 upon the opposite vertical faces of each of which are slide bars 25, 26 vertically and horizontally interlocked but slidably associated with the middle bar 24-. by a common dove-tail connection 2'7. Each slide bar 25 and 26 carries a rack 28 which are connected in pairs by a pinion 29 journaled on 60 the upper face of the intermediate bar 24. Anchored upon the vertical arm of each bracket 19 is one end of tension spring 30 the other end of which is anchored upon a nut 31 carried by a screw 32 projected through a bracket 33 carried 65 by one of the adjacent levers 20, the arrangement being such that the effective force of these springs may be adjusted by means of the screw and such that these springs counterrbalance, or nearly counterabalance, the weight of the slide I bar 70 structure and associated extension leaves. One of these springs may be provided for each of the levers 20 if desired although in practice it has been found that one spring for each pair of levers 20, 20, is generally sufficient.

Secured to and extending between each pair of slides 25, 25 and 26, 26 is an extension leaf 35.

Mounted in a pocket formed in the inner vertical face of eachslide bar 26, near its inner end, is a cam plate 41 having divergent cam flanges 42 and 43 connected together at their roots. Pivoted at 44 between the two cam flanges 42 and 43 is .a three-fingered cam dog 45 having divergent fingers 46, 4'7 and 48, said dogs being yieldingly urged to the position shown in Fig. 9 by cam dog 51.

Pivoted at on plate 41 is the cam dog 51 having divergent cam surfaces 52 and 53, the junction of which lies in the crotch between fin.- gers 46 and 47 of dog 45. Adjoining cam surface 53, and underlying cam surface 52, is a slot 54. Dog 51 is retained in its vertical plane, by a slotand-shouldered-pin connection 55 with plate 41, and is yeldingly urged to the position shown in Fig. 9 by spring 56.

Secured to the under face of the fixed top 18, adjacent theinner face of each slide bar 26, is a bracket 60, the dependingarmof which carries a pin 61 the end of which is projected into the plane of the dogs 45' and 51.

Extending outwardly from each pocket 40 the upper inner corner of each slide 26 is cut away at 62 to permit each slide 26 to slide inwardly free of pin 61.

The operation is as follows:

Starting with parts in the positions shown in Fig. 1, an outward pull exerted upon either one of the extension leaves 35 projects the slides 25 and 26 outwardlyrpins 61 riding over the cam surface 52 of dog 51 and over finger 46 of dog 45through vertical planes of the outer edges of the fixed the position shown in Fig. 2 and thence, pins 61 striking the cam flanges i2, further outward pull upon the extension leaf causes the entire slide structure to be elevated until pins 61 lie in the crotches between the cam flanges a2 and i3, finger 48 of dog 45 being first depressed by pin 61 and then snapping back over said pins, the parts being then in the positions shown in Fig. 3, at which time the extension leaves have been elevated approximately into the plane of the fixed top 18. Thereupon inward movement of either one of the extension leaves projects dogs 45 over pins 61, said pins passing between fiangesS and the adjacent fingers 47 of dogs 4.5, said fingers l'l yielding upwardly until pins 61 lie in slots 5% of dogs 51 beyond cam surfaces 43 thereof, whereupon fingers 47 of dogs 45 are swung downward into engagement with the adjacent cam flanges 43. Dogs 51 then rest on pins 61 and the leaves are in the plane of the fixed top 18.

In order to return the extension leaves to storage position either of said leaves is first drawn outwardly, in the plane of the fixed top, vhereupon pins 61 engaging the upper faces of fingers 47, pass between said faces and cam surfaces 53 of dogs 51, thus crowding the slide structure downwardly. Pins 61 engage fingers 46 of dogs 45 to swing said dogs in a clockwise direction until the junction between cam surfaces 52 and 53 are crowded below pin 61, whereupon springs 56 swing the points of dogs 51 beneath the pins 61, at which time the extension leaves are in an intermediate plane between the plane of the fixed top and the storage plane. ihereupon inward movement of either of the extension leaves drives the cam surfaces 52 of dogs 51 beneath pins 61, thus crowding the slide assembly downwardly to bring the extension leaves into a plane beneath the plane of the fixed top just before the inner edges of the extension leaves reach the p, whereupon the extension leaves may be driven inwardly to storage position as shown in Fig. 1.

The weight of the slide structure being counterbalanced by springs 30, the necessary vertical displacements of the slide structure may be readily produced as a result of horizontal movements of the extension leaves so that the extension leaves are automatically raised into and depressed below the plane of the fixed top by successive lateral sliding movements of the extension leaves.

I claim as my invention:

1. A draw-leaf table comprising a pedestal, a main top carried thereby, a vertically-movable slide structure mounted beneath the main top and comprising a laterally-shiftable leafand a slide support therefor, and means dependent upon lateral movement of the slide mechanism for automatically raising and lowering the slide structure, said means comprising coacting camdog mechanism and an abutment, one carried by a fixed portion of the table structure and the other by the slide, the cam-dog mechanism com prising two coordinated parts movable relative to each other and coacting with the abutment to produce positive opposite vertical movements of the slide structure upon alternate outward lateral movements of the slide.

2. A draw-leaf table comprising a pedestal, a

main top carried thereby, a vertically-movable slide structure mounted beneath the main top and comprising a laterally shiftable leaf and a slide support therefor, vertically movable supporting means interposed between the pedestal and slide structure, and cam-dog mechanism and a coacting abutment, one carried by a fixed portion of the table structure and the other by the slide mechanism, the cam-dog mechanism comrising two coordinated parts movable relative to each other and coacting with the abutment to produce positive opposite vertical movements of the slide structure upon alternate outward lateral movements of the slide.

3. A draw-leaf table of the character specified in claim 1 wherein the cam-dog mechanism comprises a pair of divergent cam surfaces, a threefingered cam-dog pivotally mounted between said divergent cam surfaces, and a coacting cam-dog having its free end projected between two of the fingers of the first-mentioned cam-dog.

4. A draw-leaf table of the character specified in claim 2 wherein the cam-dog mechanism comprises a pair of divergent cam surfaces, a threefingered cam-dog pivotally mounted between said divergent cam surfaces, and a coacting camdog having its free end projected between two of the fingers of the first-mentioned cam-dog.

5. A draw-leaf table comprising a pedestal, a main top carried thereby, two pairs of oppositelyprojected levers pivoted upon the pedestal below th main top, spring counter-balances acting upon said lever pairs, a vertically-movable slide structure supported upon said lever pairs, said slide structure comprising a slide movable parallel with said levers and supporting an extension-leaf at its outer end, and means dependent upon lateral movement of the slide mechanism for automatically raising and. lowering the slide structure, said means comprising coacting camdog mechanism and an abutment, one carried by a fixed portion of the table structure and the other by the slide and the cam-dog mechanism comprising relatively movable parts coacting with the abutment to produce positive opposite vertical movements of the slide structure upon alternate outward lateral movements of the slide.

6. A draw-leaf table comprising a pedestal, a main top carried thereby, two pairs of oppositelyprcjected levers pivoted upon the pedestal below the main top, spring counter-balances acting upon said lever pairs, 2. vertically-movable slide structure supported upon said lever pairs, said slide structure comprising a slide movable parallel with said levers and supporting an extension-leafat its outer end, and means dependent upon lateral movement of the slide mechanism for automatically raising and lowering the slide structure, said means comprising coacting camdog mechanism and an abutment, one carried by a fixed portion of the table structure and the other by the slide, the cam-dog mechanism comprising two divergent cam surfaces, a threefingered cam-dog pivotally mounted between said surfaces, and a cam-dog having its free end projected between two fingers of the first-mentioned cam-dog.

-7. As an article of manufacture, a cam-dog structure for draw-leaf tables comprising a main plate provided with a pair of divergent cam flanges, a three-fingered cam-dog pivotally mounted upon said plate between said camfianges, a spring biasing said cam-dog in one direction, a second cam-dog pivotally mounted upon said plate with its free end projected between the two fingers of the first-mentioned camdog most remote from the apex of the cam flanges, and a spring biasing said last-mentioned cam-dog toward the first-mentioned cam-dog.

WILLIAM OSCAR KNAUB. FREDERICK B. WALTER.

LOO

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