US1929820A

US1929820A - Extension table

Info

Publication number: US1929820A
Application number: US586636A
Authority: US
Inventors: Jacob S Knechtel
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-01-14
Filing date: 1932-01-14
Publication date: 1933-10-10
Anticipated expiration: 1950-10-10

Description

J. S. KNECHTEL EXTENSION TABLE Oct. 10, 1933.

Filed Jan. 14, 1932 2 Sheets-Sheet l III/I4 lnlntor. Jaco S. KHeC/1fel.

Patented Oct. ll

cairn srArEfs' fra'renrorrcs 1,929,820 ExTENsIoN TA B LE I Jacob S. Knechtel, Hanover; Ontario, Canada Application January 14, 1932; Serial No. 585,636

4 Claims. ((31. 45 -112) The principal objects of this invention are to provide an extension table which may be operated with very great ease to either extended or closed positions, and to devise a construction of extremely simple form which will be inexpensive to manufacture and very dependablein operation. I I

A further object is .to provide an extension table with an extension leaf having side rails corresponding with the side rails of the table top.

The principal features of the invention consist in the novelarrangernent of an extension leai between the extension slide and'the" permanent table top whereby said leaf is retained in its central position and in the novel construction and arrangement of a lever carried by the adjustable slide and co-operating with cam blocks on the extension leaf whereby said leaf is raised 01' lowered vertically. I I

A further feature of importance consists in the arrangement of hinged-side rails corresponding with the side rails of the table mounted on the extension leaf to complete the side rail of the table when in its extended position.

'In the accompanying drawings, Figure 1 is an underside plan View of my improved table top shown in the closed position.

igure 2 is an underside plan view of the table top shown in the. extended position, one of the side rails on the extension leaf being .folded and the other opened to the extended position.-

Figure 3 is a cross sectional View through the line 3-3 of Figure 1.

Figure 4 is a longitudinal sectional view of one end of the table, taken through the line 4-4 of Figure 1. Y

On reference to the accompanying drawings it will be seen that the table top is formed of two movable portions 1 and 2 which are preferably constructed with the moulded side rails 3. The outside extension slide bars 1, which are of the usual construction, are here shown secured to the underside of the top of the movable portion 1 and the inside slide bars 5 are secured to the underside of the top of the movable portion 2 and between these arearranged the central slide bars 6, each set of bars being slidably connected in the usual manner by dove tail tongue and groove slide connection.

Thecentre bars 6 are of slightly greater depth than the

bars

4 and 5 and the top and bottom surfaces thereof extend slightly above and below the inside and outside bars.

. The centre'bars are supported on any desirable form of leg supports 7.

1n the centre of each of the bars 6 and on the underside is pivotally mounted a spur gear 8 and rack bars 9 secured to the underside of the inner and outer slide-bars mesh with these gears to operate both endsof the table simultaneously.

Thisarrangement of spur gears and racks is quite common. 1

The outside and inside slide bars are spaced from the underside of, the table top bythe

bars

10 and 11 respectively, the space being slightly greater than the thickness of the table top. These spacer bars extend from the outside ends of the table top inwardly andthe inner ends are spacedfapart'a distance slightly greater than I the width of the extension leaf 12, which-rests 76' between them upon the top of the centre eXtension bar. 7 7

Each of the centre extension bars is provided with a vertical hole 13 which isslightly offset I from the pivot of the gears and pins '14 secured in the leaf 12, preferably centrally thereof, extend into these holes and fit quite loosely therein. These pins hold the extension leaf in a cen tralized position both longitudinally and transversely of the table. I I

Bars 15' are secured to the underside of the extension leaf preferably outside of the extension 'slide bars and are adapted to engage the underside of the portions 1 and 2 to ensure the alignment of the leaf with the table top when the leaf is raised and also to prevent the disp1acement of the leaf.

A pair of

cam blocks

16 and 17 are secured in offset relation to the underside of the leaf 12 preferably adjacent to the longitudinal edges. These blocks are formed with bevelled inward ends.

A cross bar 18 is secured between the inside slidebars 5 and is preferably set diagonally, the ends thereof being rabbeted into grooves 19 in the inner sides of said bars.

A lever 20, which may be formed of a bar of wood, is pivotally mounted on a bolt 21 secured in the cross bar 18. This lever is preferably of angled form, the inward end 22 thereof being cut 100 to extend at an obtuse angle from the outer portion. This lever is adapted upon being swung on its pivot to engage the bevelled end of both of the cam blocks 16 and 1'? simultaneously when thetable portions 1 and 2 have been drawn out to in Figure l or in the extended position in align-- ment with the side rails of the table. Such friction hinges are quite commonly known in the furniture art and their construction need not' b described in detail. I

It will be readily appreciated that a table constructed as described is of very simple form and its operation is so simplethat even a small child can quite easily operate it.

To operate the table it is merely necessary to pull upon either end when the movable portions 1 and 2 will slide apart to their maximum position.- This'movement brings the pivot bolt of the lever to a central position as shown inFigure 2 underneath the extension leaf. By reaching under the table top and grasping the knob 24;, the operator then=merely swings'the lever on its pivot and the lever engaging thebevelle'd'en'ds of the cam blocks lifts the leaf into'a position level with' the tabletop, it'beingheld-to its central-position by the pins 14 engaging the sides ofthe holes -13.

The leaf-will beheld in its raised position supported by-the-rigid lever with the-extending ends of" the crossbars 15' preferably snugly engaging theunderside ofthe adjacent table top sections I and 2-. The siderails are then swung "downwardly and the ends of the table can then be moved inwardly-to close'tightly against the centre In closing the table" it is "merely necessary to fold in='the-side'"rails, swing-the l'ever*20 on its pivotto lower the centreleaf; then pushtheend members'together.

What-I claim as' my invention is:

1. In an extension table, the'combinati'on with a pa-ir of -table f tops mounted upon extension slides, of a leaf housed beneath the "movable members of the table top and supported on said extension slides, means for holding said leaf from lateral or longitudinal displacement, a cross bar extending between and connected with. the inner extension slides, a pivot bolt secured to said cross bar, a lever pivoted on said pivot bolt above the cross bar and extending transversely of said leaf, and bevelled blocks arranged on the underside of said leaf and directly engaged by said lever at spaced points either side of its pivot. I r

2. In'an extension table, the combination with a pair-of separable table tops mounted on extension slides, of a leaf member housed beneath the table tops and movable vertically, cam blocks sloping longitudinally of the leaf at the side edges thereof, a lever pivotally supported on a 'verti cal pivot below said leaf and extending longitudinally between said extension slides and'directly engagingsaid cam blocks: inits swinging movement to raise and lcwer'said leaf said lever being of angledform with the inner and outer portionsthereof -radiating from said. pivot in angular relation to each othenarid a handle extension'"fromj the outer portion of said lever accessible between the slid'e'extensions at the end of the table.

4. In an extension table, the combination with a "pair of table tops 'mount'e'd upon I extension slides, of a leaf housed beneath the table tops and movable vertically, said leaf presenting cammedsurfaces sloping in the longitudinal direction thereof and a swingablen eans arranged longitudinally ofthe table and movable into and out'of directoperative engagement with said 1 cammed surfacesin its swinging movement to raise andl'ower said movable leaf. 7 JACOB S. KNECHTEL.