EP0381833A2 - Table extensible - Google Patents

Table extensible Download PDF

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Publication number
EP0381833A2
EP0381833A2 EP89122432A EP89122432A EP0381833A2 EP 0381833 A2 EP0381833 A2 EP 0381833A2 EP 89122432 A EP89122432 A EP 89122432A EP 89122432 A EP89122432 A EP 89122432A EP 0381833 A2 EP0381833 A2 EP 0381833A2
Authority
EP
European Patent Office
Prior art keywords
slide bar
slide
slide bars
table plate
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89122432A
Other languages
German (de)
English (en)
Other versions
EP0381833A3 (fr
Inventor
Pekka Liias
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LIIAS-MARKKINOINTI Oy
Original Assignee
LIIAS-MARKKINOINTI Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LIIAS-MARKKINOINTI Oy filed Critical LIIAS-MARKKINOINTI Oy
Publication of EP0381833A2 publication Critical patent/EP0381833A2/fr
Publication of EP0381833A3 publication Critical patent/EP0381833A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B1/00—Extensible tables
    • A47B1/02—Extensible tables with insertable leaves arranged in the centre and fixed frames

Definitions

  • the invention relates to an extensible table comprising a table plate comprising at least two table plate portions, and a foot construction supporting the table plate, at least one slide bar unit being ar­ranged under the table plate in its immediate vicin­ity, the slide bar unit comprising at least two inter­connected slide bars longitudinally displaceable with respect to each other so as to draw the table plate portions apart from each other for inserting an addi­tional table plate portion therebetween.
  • Extensible tables are well-known and the de­tails of their extendibility may be effected in various ways.
  • the present application is limited to tables which are extended by drawing apart the table plates so that one or more additional plates can be inserted therebetween.
  • a frequent problem with extensible tables provided with slide bars is that the slide bars supporting the table plate portions bend under the weight of the table plate portions so that the surface of the table is bent, being no longer fully horizontal. This is not merely a matter of ap­pearance but it may also deteriorate the operating properties of the table. If the slide bars are slender, the support is unstable; large slide bars, of course, support the table plates better than small ones; on the other hand they are bulky and expensive to manufacture. Slide bars are usually made of wood which has a good rigidity in relation to its weight and volume. Alternatively, the slide bars can be made of galvanized iron or in some cases of aluminium even though the table itself would be made of wood.
  • metal slide bars are small in size without any risk of breaking.
  • a disadvantage is that they deflect considerably even under a very low load. The deflection of an aluminium slide bar is particularly high due to the high elas­tic modulus of aluminium.
  • each slide bar in the slide bar unit comprises a longitudinal groove in which a guide piece is fastened close to one end of the slide bar, the guide piece being arranged eccentrically in the groove so that its edge facing away from the table plate and entering the groove of the adjacent slide bar is at a greater distance from the centre line of the groove than its opposite edge, similarly entering the groove of the adjacent slide bar, whereby the guide pieces in the slide bars guide the slide bars so that the more the slide bars are drawn apart from each other, the more the slide bars deviate from their parallel posi­tion with respect to each other.
  • the slide bar unit is preferably formed by a pair of slide bars, whereby an end portion of the upper surface of each slide bar in the pair of slide bars is recessed on the side of the guide piece, the unrecessed slide bar surface on the other side being intended to be fastened directly to the table plate above.
  • the extensible table is simple to manufacture and steady in construction when two pairs of slide bars are used, whereby all the slide bars in the pairs of slide bars and the guide pieces attached thereto are fully identical.
  • the basic idea of the present invention is to provide an extensible table with slide bars which in the extended position tend to form an angle which creates a kind of preload for slide friction, compen­sating for the load caused by the weight of the table plates so that the table plates are in a straight po­sition even in the extended position of the table.
  • the slide bars In the closed or retracted position the slide bars extend substantially in parallel.
  • a major advantage of the table according to the invention is that the table plates remain straight and horizontal in the extended position even though the slide bars by means of which the table can be extended are relatively small in size and easy to manufacture.
  • the slide bars are easy to operate so that the table can be rapidly changed from one position of use to an­other without any greater force.
  • the solution of the invention can also be applied to a flap hinge table whereby an additional able plate attached to the end of the table is fastened by means of the slide bars of the invention in such a way that the additional table plate can be fixed in horizontal position without that its outer edge slopes downwards.
  • FIG. 1 the extensible table according to the invention is shown from above in retracted posi­tion.
  • the table plate generally indicated with the reference numeral 1
  • the table plate 1 comprises two abutting table plate por­tions 2 and 3.
  • Two slide bar units 4, 5 are arranged under the table plate portions 2, 3.
  • Both slide bar units are formed by a pair 4, 5 of slide bars compris­ing two interconnected slide bars 6, 7 and 8, 9, re­spectively, arranged side by side and longitudinally displaceably with respect to each other.
  • the slide bars 6 to 9 are made of wood, and the upper surface of each slide bar is provided with holes 10 for screws for fastening the table plate portions 2, 3 (directly) on the slide bars.
  • One end portion 11-14 of said upper surface is recessed so that it does not make contact with the lower surface of the table plate portions 2, 3.
  • the function of the recessed portions will be de­scribed later.
  • the foot construction supporting the table plate construction is not shown in Figure 1.
  • the extensible table according to the invention is shown in extended position, an addi­tional table plate portion 15 being inserted between the table plate portions 2 and 3.
  • the additional table plate portion 15 is fitted in position between the table plate portions 2 and 3 in a manner known for one skilled in the art.
  • FIGS 3 and 4 illustrate the operation of the pair of slide bars to be used in the table according to the invention.
  • the figures show the pair of slide bars from the side.
  • the backward slide bar A drawn with unbroken lines, comprises a groove B extending along the bar, and a guide piece C is fitted in the groove.
  • the guide piece C projects from the slide bar so as to enter a groove (not shown) in a slide bar D (drawn with broken lines) positioned on the slide bar A.
  • the groove in the slide bar D extends longitudinal­ly similarly as the groove B in the slide bar A.
  • the guide piece C is fastened close to the left end of the slide bar A, and it is arranged eccentrically so that its free lower edge E is at a greater distance from the centre line of the groove B than its upper edge F.
  • the slide bar D comprises a guide piece G similar to that of the slide bar A.
  • the guide piece G is fastened close to tne right end of the slide bar D, and its upper edge H is at a greater distance from the centre line of the groove in the slide bar than its lower edge I.
  • the guide pieces C and G are arranged eccentrically as described above, the slide bars A and D extend substantially in parallel with each other, defining therebetween an angle ⁇ ⁇ 0 in the retracted position of Figure 3.
  • the guide pieces C and G approach each other and the angle ⁇ grows.
  • the angle between the slide bars A and D is the greater, the more the slide bars A and D are drawn apart.
  • Figure 5 shows the table of Figure 1 from the side when enlarged double.
  • Figure 5 showing the table plate construction in retracted position, the same reference numerals as in Figure 1 are used.
  • a longitudinal groove in the slide bar 9 is indicated with the reference numeral 16.
  • the slide bar 8 com­prises a similar groove (not shown in Figure 5).
  • Figure 6 shows the table construction of Figure 5 in extended position with the additional table plate portion 15 fitted between the table plate portions 2 and 3.
  • Fig­ure 6 shows how the pairs of supporting slide bars in the solution according to the invention tend to deform the table plate 1.
  • the table plate portions 2, 3 could not be drawn apart from the position of Figure 5 to that of Figure 6 if the end portions 13, 14 of the upper surfaces of the slide bars would not be re­cessed. Without such recessed portions, the left-hand end portion of the upper surface of the slide bar 9 would hit the lower surface of the table plate portion 2 so that the surfaces would get stuck and the plate portions could not be drawn apart. Correspondingly, the right-hand end portion of the upper surface of the slide bar 8 would hit the lower surface of the table plate portion 3 so that the surfaces would get stuck. It is also possible that the upper surfaces of the slide bars are straight instead of being recessed.
  • the lower surfaces of the table plate por­tions 2, 3 should be provided with grooves correspond­ing to the slide bars in width and sufficiently deep to enable the slide bars to be drawn apart.
  • spacers corresponding to the recesses such as support ribs, can be provided between the table plates 2 and 3 and the slide bars 8 and 9 so as to form a sufficiently wide gap, corresponding to gaps 17 and 18 in Figure 5, between the upper surface of one end por­tion of the slide bars and the lower surface of the table plates.
  • the shape of the extended table plate construction will not be such as shown in Figure 6, but the weight of the table plate portions 2, 3 and 15 cause the slide bars 8 and 9 to bend so that the shape of the t ble plate construction is such as shown in Figure 7, in which the table plate 1 is even and horizontal.
  • Figure 8 shows the slide bar 9 of Figure 1 from the top and enlarged fourfold.
  • Figure 9 shows the slide bar of Figure 8 as seen in the direction J. It appears from Figure 8 how a guide piece 19 fitted in the groove 16 of the slide bar close to the end of the slide bar projects from the groove.
  • An end portion 14 of the upper surface 9 of the slide bar is recessed on the side of the guide piece 19.
  • the guide piece 19 is asymmetrical in cross-section as seen in the direction of the groove 16 so that its lower edge 20 facing away from the table plate and to be fitted in the groove of the adjacent slide bar is at a greater distance from the centre line of the groove 16 than its opposite upper edge 21 similarly to be fitted in the groove of the adjacent slide bar (corresponding to the arrange­ment of Figure 3).
  • a stop member such as a nail 22, is arranged in the groove 16 so as to prevent the de­tachment of the two adjacent slide bars from each other: the guide piece of one of the two slide bars is arrested by the nail in the other slide bar.
  • the shape and position of the stop member may deviate from those shown in the figure.
  • Figure 10 shows the slide bar of Figure 8 as seen in the direction K.
  • Figure 11 shows the slide bar of Figure 8 as seen in the direction L.
  • the groove 16 is symmetrical and dovetail shaped.
  • the guide piece 19 positioned in the groove 16 is such in shape that after having been turned through 180° around its longitudinal axis, its shape is the same as before turning.
  • Figures 12 and 13 show the slide bar of Figure 9 along the section XII-XII and XIII-XIII, respective­ly.
  • Figures 14 to 16 show the slide bar 8 of Figure 1 from above and from both sides when enlarged four-­fold. So the slide bar 8 shown in Figures 14 to 16 interacts with the slide bar 9 of Figures 8 to 10.
  • a guide piece fastened to the slide bar 8 close to its one end is indicated with a reference numeral 23.
  • An edge 24 of the guide piece 23 facing the table plate 1 and entering the groove of the adjacent slide bar is positioned closer to the centre line of the groove 25 than its opposite edge 26, similarly entering the groove of the adjacent slide bar.
  • Figure 15 shows the slide bar of Figure 14 as seen in the direction M
  • Figure 16 shows the slide bar of Figure 14 as seen in the direction N.
  • the groove of the slide bar 8 is in­dicated with 25.
  • the slide bar 8 is fully identical with the slide bar 9. Considerable economic advantages are obtained in the manufacture of slide bars when the slide bars 8 and 9 forming the pair 5 of slide bars are fully identical.
  • Figure 17 shows a pair of slide bars formed by the slide bars of Figures 8 to 10 and 14 to 17 as seen from the end and enlarged double as compared with Figures 8 and 14.
  • Figure 18 is a perspective view of the guide piece 23 attached to the slide bar 8. Similarly as above, the guide piece 19 attached to the slide bar 9 is fully identical with the guide piece 23.
  • Figure 19 shows a cross-section of an alterna­tive guide piece to be attached to the slide bars.
  • Figures 20 to 22 show a preferred embodiment of the slide bar unit when a wide range of extendability is required.
  • a slide bar unit 28 is shown from above.
  • the slide bar unit comprises three interconnected slide bars 29, 30, 31 arranged side by side and longitudinally displaceably with respect to each other.
  • the outermost slide bars 29 and 31 are of the same type as the slide bars 5 to 8 shown in Fig­ures 1, 2 and 5 to 17. Thus they comprise grooves (not shown in Figure 20), guide pieces 33 and 37 (drawn by broken lines) and recessed portions 38 and 39.
  • the middlemost slide bar is of different type, comprising two grooves (not shown in Figure 20) and guide pieces 32, 32′ (drawn by broken lines) fitted in the grooves.
  • the guide pieces 32, 32 are fastened to the slide bar 30 in such a manner that they are posi­tioned close to the ends of the two slide bars at opposite ends.
  • the distance X between the guide pieces 32′ and 33 and the distance Z between the guide pieces 32 and 37 de­creases. Roughly speaking, the maximum length of the slide bar unit in extended position is the sum of the lengths of the slide bars forming it.
  • Figure 21 shows a section along the line XXI-XXI of Figure 20. As ap­pears from the figure, the upper surface of the middlemost slide bar 30 is positioned lower than the upper surface of the outermost slide bars 29 and 31.
  • an edge 35′ which faces away from the table plate and enters the groove of the adjacent slide bar 29 is at a greater distance from the centre line of the groove 34′ than the opposite edge 36′ similarly entering the groove of the adjacent slide bar 29.
  • This construction is such that the more the outermost slide bars 29 and 31 are drawn apart, the more they deviate from their parallel position with respect to the middlemost slide bar 30; in this way, a double preload effect is attained in the slide bar unit 28.
  • the nail-like stop members 40 and 41 are arranged in the grooves of the middle most slide bar 30 in such a manner that they are positioned on opposite sides with respect to the guide pieces 32 and 32′. The stop members 40 and 41, which are fastened close to each end of the slide bar 30, prevent the outermost slide bars 29 and 31 from being detached from the slide bar 30.
  • the number and shape of the slide bars can vary (a single pair of slide bars is enough for supporting the table plates though it is preferable to use two pairs). In view of the manu­facturing techniques, however, it is important that the guide pieces in both slide bars in the pair of slide bars are identical in shape and that the grooves in both slide bars of the pair of slide bars are identical in shape.
  • the shape and position of the stop member may also vary.
  • the slide bars need not be made of wood, though wood is to be preferred.

Landscapes

  • Tables And Desks Characterized By Structural Shape (AREA)
EP19890122432 1989-02-08 1989-12-05 Table extensible Withdrawn EP0381833A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI890598A FI80827C (fi) 1989-02-08 1989-02-08 Foerlaengbart bord.
FI890598 1989-02-08

Publications (2)

Publication Number Publication Date
EP0381833A2 true EP0381833A2 (fr) 1990-08-16
EP0381833A3 EP0381833A3 (fr) 1991-01-23

Family

ID=8527860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890122432 Withdrawn EP0381833A3 (fr) 1989-02-08 1989-12-05 Table extensible

Country Status (3)

Country Link
EP (1) EP0381833A3 (fr)
DK (1) DK167421B1 (fr)
FI (1) FI80827C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627794C2 (de) * 1996-07-10 1998-07-23 Tony Rueegg Ausziehtisch, ausziehbare Trägerkonstruktion, sowie Gleitkörper für eine ausziehbare Trägerkonstruktion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1848475A (en) * 1932-03-08 Adjustable table extension
US2456999A (en) * 1945-06-15 1948-12-21 Segal Irving Extension table
GB689491A (en) * 1948-12-15 1953-04-01 William Angus & Company Scotla Improvements relating to tables
US2860939A (en) * 1958-04-22 1958-11-18 Cooper Joseph Slide assembly for extension tables
DE2203378A1 (de) * 1972-01-25 1973-08-02 Loh Kg Hailo Werk Zargenfuehrung fuer ausziehtische oder -platten
DE8511029U1 (de) * 1985-04-16 1985-06-20 Hailo-Werk Rudolf Loh Gmbh & Co Kg, 6342 Haiger Ausziehtisch für Möbel, insbesondere Küchenmöbel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1848475A (en) * 1932-03-08 Adjustable table extension
US2456999A (en) * 1945-06-15 1948-12-21 Segal Irving Extension table
GB689491A (en) * 1948-12-15 1953-04-01 William Angus & Company Scotla Improvements relating to tables
US2860939A (en) * 1958-04-22 1958-11-18 Cooper Joseph Slide assembly for extension tables
DE2203378A1 (de) * 1972-01-25 1973-08-02 Loh Kg Hailo Werk Zargenfuehrung fuer ausziehtische oder -platten
DE8511029U1 (de) * 1985-04-16 1985-06-20 Hailo-Werk Rudolf Loh Gmbh & Co Kg, 6342 Haiger Ausziehtisch für Möbel, insbesondere Küchenmöbel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627794C2 (de) * 1996-07-10 1998-07-23 Tony Rueegg Ausziehtisch, ausziehbare Trägerkonstruktion, sowie Gleitkörper für eine ausziehbare Trägerkonstruktion

Also Published As

Publication number Publication date
DK167421B1 (da) 1993-11-01
FI890598A0 (fi) 1989-02-08
FI80827C (fi) 1990-08-10
DK549389D0 (da) 1989-11-03
FI80827B (fi) 1990-04-30
DK549389A (da) 1990-08-09
EP0381833A3 (fr) 1991-01-23

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