US 1952621 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
March 27, 1934. B'ROMLEY 1,952,621
EXTENSION ATTACHMENT Filed June 13. 1931 Waff/vf): f
Patented Mar. 27, 1934 UNITED STATES PATENT OFFICE EXTENSION ATTACHMENT Application June 13, 1931, Serial No. 544,218
2 Claims. (Cl. 45-l13) My invention relates to tables having extension leaves and relates primarily to a simple and sturdy extension attachment for tables by which an extension leaf may be permanently attached to a table but may be easily and quickly moved between retracted and extended positions.
The principal object of my invention is to provide an attachment anda table in which the eX- tension leaves are supported againstthe underside of the table top when such leaves are in retracted position, and in which the extension leavesare supported by straight horizontal slides adapted to move horizontally into outer or extended position, there being simple means for raising and supporting the extension leaves in a plane withl the top of the table with which the extension leaves are employed.
It is a further object of the invention to provide a construction in which the extension leaves 2 are always in true horizontal position, and in which the leaves are attached to the horizontal slides by eccentric members which rotate so as to move the extension leaves between lowered and raised positions, these eccentric members having a slight upward movement in rotating from raised to lowered position, whereby to lock the leaves in raised position and to there be held with greater force as theweight on the leaves is increased.
It is a further object of the invention to provide an extension table construction of the above i character in which the table top can be secured firmly to the base. 35 A further object of the invention is to provide a simple parallel link eccentric device for supporting an extension leaf in adjustable relationship to the horizontal extension slides which are of straight form and of great strength.
Further objects and advantages of the invention will be made evident throughout the following part of the specication.
Referring to the drawing which is for illustrative purposes only: 45 Fig. 1 is a side view of an extension table embodying my invention, one of the extension leaves being shown in extended position therein.
Fig. 2 is a fragmentary end view taken from the right hand side of Fig. 1 and being drawn to enlarged scale.
Fig. 3 is a fragmentary section on a plane represented by the line 3-3 of Fig. 2, showing the extension leaf in raised position.
Fig. 4 is a fragmentary section similar to Fig.
55 3, but showing the extension leaf in lowered and retracted position, this view being derived on a plane represented by the line 4-4 of Fig. 2.
In the simple embodiment of myk invention shown in Fig. 1, I'show a table 5 consisting essentially of a base 6 and a top '2,' the base 6 including four legs 8, side pieces 9 and end pieces 24, and the top '7 including extending end portions 33 which project longitudinally beyond horizontal spacer or ller members which separate the top 7 from the base 6, thereby forming horizontal spaces between the end portions 33 and the end parts of the base 6.
' At the right-hand side of Fig. 1 I show an eX- tension leaf 31 in extendedposition, and at the left-hand side of Fig. 1 I show an extension leaf 26'in retracted position in one of the horizontal spaces 27. In Fig. 3 I show the manner in which the leaf 31 is supported on horizontal slides 30 which slide under the top 7 and through notches 28 in the end pieces 24 which extend across the space between the upper ends of the legs 8. For this purpose of supporting the extension leaf 31 in raised position adjacent to an end 33 of the top 7, as shown in Fig. 3, or in lowered position so that it may slide into a horizontal space 27 under the end 33, I employ vertically adjustable devices 29, each of which includes a lower plate 10, an upper angle 14, afpair of swingable or eccentric members 11 and 12, and a parallelizing link or ban 13. 85
The'lower plates 10 are secured to side faces of the slides by screws and the eccentric members 11 and 12 are pivoted thereto by rivets 15 and 16. The upper members or angles 14 are pivotally secured to the eccentric members 11 and Tn 12 by means of rivets 17 and 18. The ends of the links 13 are pivoted to the eccentric members 11 and 12 by means of rivets 19 and 2U. Near the lower ends of the eccentric members 11, as shown in Figs. 2 and 3, are rectangular holes 21 in which are secured the ends of a rectangular interconnecting bar 41, and from the bar 41 a tension spring 42 is extended to a screw-eye 43 in the lower face of the extension leaf 3 1. When the eccentric members 1l and 12 are in the positions of Figs. 2 and 3, the bar 4l is below the pivots l5, and the pull of the spring 42 tends to rotate the eccentrics 11 and 12 in anti-clockwise direction whereby to force the edge 47 of the leaf 31 against the edge 48 of the end 33.
By pulling the extension leaf 31 in the direction of the arrow 38 of Fig. 3, the eccentrics or levers 11 and 12 may be rotated in clockwise direction and into the positions shown in Fig. 4,
thereby swinging the leaf 31 first slightly up- "110 Yet wardly, rightwardly, and then downwardly into engagement with the upper faces of the slide bars 30, as shown in Fig. 4. The leaf 31 being now in lowered position, the slide bars 30 and the leaf 31 may be slid leftwardly from the position in which they are shown in Fig. 3, into the position of Fig. 4 in which the leaf 3l rests in the space 27 under the end 33 of the table top 7. At this time the bar 41 is above the level of the pivots 15, and therefore the pull of the spring 42 tends to rotate the eccentrics 11 and l2 in clockwise direction so as to hold the leaf 31 down tightly against the upper faces of the slide bars 30 while the leaf 31 is resting in the space 27 and during its movement in and out of such space 27.
To move the extension leaf 31 from retracted position to extended position, the fingers are caused to engage a finger notch 50 adjacent to the outer edge of the leaf 31 and the leaf 31 is then pulled rightwardly, causing the slides 30 to move rightwardly until a stop strip 5l, secured to the under faces of the slide bars 30, engage the inner face of the end piece 24 as shown in Fig. 3. At this time stop blocks 32 which are secured on the upper faces of the slide bars 3G, are moved into such positions that they project slightly rightwardly from, or beyond, the edge 48 of the end 33, so that when the leaf 31 is swung upwardly from the lowered position which it is in when initially slid from the space 27, the edge 47 of the leaf 31 will rest upon the rightwardly projecting portion of the blocks 32, as shown in Fig. 3.
From Fig. 3 it will be perceived that the pivots Y17 lie to the left of the pivots 15 when the leaf 31 is in raised position; therefore, the weight of the leaf 31, and any additional weight which may be placed thereon, tends to resist movement of the leaf 31 toward lowered position. Accordingly, lowering of the leaf 3l may be accomplished only by a rightward pull thereon greater than the action of the spring against rightward movement of the leaf 31, Furthermore, the spring 42 may be of such strength that should the slide bars 30 be not pulled out to their full rightward position, the pull of the spring 42 against the lower portions of the eccentrics 11, while the edge 47 is in engagement with the edge 48, will cause the slide bars 30 to be moved rightwardly to the full distance determined by the engagement of the stop 51 with the end piece 24.
In my improved construction, the sliding structure formed by the slide bars 30 may be made very strong, yet inexpensively, and the raising and lowering means 29 may be cheaply constructed from stamped parts. In its preferred form, this raising and lowering means 29 operates rotatively in the adjustment of the extension leaf 31 between raised and lowered positions.
Although I have shown and described a simple and practical embodiment of my invention, it will be recognized that the various parts thereof may be replaced by other equivalent parts which will produce the same results in substantially the same manner; therefore, it should be kept in mind that the invention is not limited to the details disclosed herein, but should be accorded the full scope of the following claims.
I claim as my invention:
1. In a table construction of the character described, the combination of: a base; a top on said base, there being a space between said base and an edge portion of said top; an extension leaf adapted to be received in said space in horizontal position; a slide structure horizontally slidable under said space; link means for securing said leaf to said slide structure, said means being pivotally attached to said slide structure and to said leaf, and being adapted to hold said leaf in a raised position level with said edge portion of said table top and in a lowered position in which it will move into said space when said slide structure is slid inwardly; and spring means having one end secured to said leaf and the other end thereof secured to said link means so as to exert a resilient force to hold said leaf in either raised F lever members at a point eccentric to one of said:
securing means so as to swing from side to side of such securing means as said extension leaf is moved between raised and lowered positions and to exert a force for holding said leaf in either of ,Y
BURT H. BROMLEY.