US1950021A

US1950021A - Extension table

Info

Publication number: US1950021A
Application number: US688242A
Authority: US
Inventors: Jr Charles L Creech
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-09-05
Filing date: 1933-09-05
Publication date: 1934-03-06
Anticipated expiration: 1951-03-06

Description

March 6, 1934. c QREECH, JR 1,950,021

EXTENSION TABLE Filed Sept. 5, 1933 2 Sheets-Sheet l V I A5 fl '74 CHARLES L. CREECHLJIQ.

March 6, 1934- c. 1.. CREECH, JR

EXTENSION TABLE Filed Sept. 5, 1933 2 Sheets-Sheet 2 CHARLES L. CREECHJR iliL lllllliiurj Patented Mar. 6, 1934 UNETED T E S PART FFHT 8 Claims.

This invention relates to an extension table having a very inexpensive structure, thus enabling its use in many tables at a cost so low as to provide an extension table which can be sold at an extremely low price in comparison with the more complicated extension tables.

It is an object of this invention to provide an extension structure for tables comprising the extremely simple structure of a pair of parallel bars having channels in their upper edges with followers mounted in the channels and secured to the extension portions of the table top and having racks secured directly to the lower surface of the extension portions and engaging opposed portions of a pinion secured centrally of each parallel bar, the hardware supporting the pinions having curled ends for confining the racks against the pinions.

Some of the objects of the invention having been stated, the details of the invention will appear more fully when taken in connection with the accompanying drawings in which:-

Figure 1 is an elevation of an extension table constructed in accordance with my invention;

Figure 2 is a top plan View of my extension structure with parts broken away and with the additional leaf omitted;

Figure 3 is an isometric view of the central portion of one of the parallel bars and the racks and pinion associated with each bar;

Figure 4 is a transverse sectional view taken along the line 4-4 in Figure 2;

Figure 5 is a transverse sectional view taken along the line 55 in Figure 2.

Referring more specifically to the drawings, indicates the framework of a conventional table which may have a top framework thereon as desired, or the extension structure can be secured directly to the tops of the posts if desired. Two bars 11 are secured to the top of the framework in parallel relation, each of these bars being identical in structure and similar reference characters apply to both. Each parallel bar has a longitudinally disposed groove 12 in the upper side thereof in which are slidably mounted a plurality of follower blocks 13, each block having channels along each side thereof, and the grooves in the parallel bars being larger at the bottom than at the top, whereby, when the follower blocks 13 are fed thereinto from the open ends of the groove they cannot be moved upwardly out of the grooves. These follower blocks 13 have vertically disposed holes therein which are penetrated by wood screws 14, which have their tips or upper ends embedded in the

sections

15 and 16 of the table top.

Centrally of each parallel bar 11 there is disposed a bracket 17 having a flat central portion and having hooked portions 17c and 171) on its ends. Centrally of this bracket there is mounted for rotation a pinion 18, and racks 19 and 20 have one of their ends secured directly to the lower side of the top sections by means of a screw 21. with the pinion 18 by the hooked end portions 17a and 17b of the bracket 17.

Bracket 17 is secured to the parallel bar by means of a screw 27, which also penetrates pinion 18 and secures it in position for rotation.

In order to secure the bars 11 to each other in exact parallel relation, a plurality of struts 28 may be provided, it being evident that the number of struts used will vary with the length of the :7

17 while the top sections are pushed into engagement with the additional leaf 22.

It is to be noted that top section 15 has a plurality of pins 23 projecting from the inner edge thereof, which are adapted to penetrate holes 24 in the top section 16, when no additional leaf is employed, but when the additional leaf is being employed, then the pins 23 project into holes 25 in the additional leaf 22 and the other edge of the additional leaf has pins 26 projecting from the other edge thereof which fit into the holes 24 in the top section 16.

It is to be noted that there is some clearance between the groove 12 and the follower blocks or members 13. ment of blocks 13 in groove 12. the fact that the blocks 13 are pivoted centrally, they easily follow in the groove 12.

It is to be noted that the blocks 13 normally rest on the bottom of the groove 12 and is out of contact with the sidewalls of the groove. This eliminates much friction and also prevents rapid wear. If the upper edges of the sidewalls of the groove were in continuous contact with the The racks l9 and 20 are held in engagement This permits easy sliding move- On account of area of wearing surface rapid wear would result,

but with the bottom of the groove receiving all the wear, such wear is slower on account of the broad surface.

It is also to be noted that the ends of the racks l9 and 20 have a portion which has no teeth therein. This forms a stop and prevents the racks from passing out of engagement with the pinion, as it limits the outward movement of the top sections.

Another advantage of the structure shown in the drawings is that the racks are pivotally connected to the top sections and therefore the top sections do not influence the racks in their engagement with the pinions, but the racks are allowed to float in the guides 17a and 17?). This prevents any binding between the racks and the pinion and the supports for the racks.

In the drawings and specification there has been set forth a preferred embodiment of the invention and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being set forth in the appended claims.

I claim 1. An extension table having a pair of parallel bars provided with grooves in the upper side thereof and extending longitudinally of the bars, said grooves being restricted their upper portions, a plurality of memi: rs having enlarged lower portions slidaoly mounted in said grooves, a plurality of s etions forming the table top, means pivotally connecting each of said members to the lower surface of said sections.

2. An extension table having a pair of parallel bars provided with groves in the upper side thereof and extending longitudinally of the bars, said groves being restricted at their upper portion, a plurality of members having enlarged lower portions slidably mounted in said grooves, a plurality of sections forming the table top, means pivotally connecting each of said members to the lower surface of said sections, a pinion rnounted on the upper side of said bars and a pair of racks having one of their ends pivotally secured to the lower surface of said sections and engaging opposed portions of said pinion.

3. An extension table having a pair of parallel bars provided with grooves in the upper side thereof and extending longitudinally of the bars, said grooves being restricted at their upper portion, a plurality of members having enlarged lower portions slidably mounted in said grooves, a plurality of sections forming the table top, means pivotally connecting each of said members to the lower surface of said sections, a pinion mounted on the upper side of said bars and a pair of racks having one of their ends secured to the lower surface of said sections and engaging opposed portions of said pinion and single means for supporting said pinion, and holding said racks in engagement with said pinion.

4. An extension table having a pair of parallel bars provided with grooves in the upper side thereof and extending longitudinally of the bars, said grooves being restricted at their upper portion, a plurality of members having enlarged lower portions slidably mounted in said grooves, a plurality of sections forming the table top, means pivotally connecting each of said members to the lower surface of said sections, a pinion mounted on the upper side of said bars and a pair of racks having one of their ends secured to the lower surface of said sections and engaging opposed portions of said pinion, single means for supporting said pinion and holding said racks in engagement with said pinion and a bracket disposed transversely of each bar for supporting the pinion and having hooked portions on its ends forming slides for said racks.

5. An extension table having a top formed of a plurality of sections, a pair of parallel spaced channel bars having longitudinally extending slots therein, broader at the bottom than at the top, a plurality of members pivotally mounted on the lower surface of the sections and having enlarged portions disposed in the enlarged portions of said grooves, permitting movement of the members longitudinally of the grooves but restricting lateral and vertical movement thereof.

6. An extension table having a top formed of a plurality of sections, a pair of parallel spaced channel bars having longitudinally extending slots therein, broader at the bottom than at the top, a plurality of members pivotally mounted on the lower suriace of the sections and having enlarged portions disposed in the enlarged portions of said grooves permitting movement of the members longitudinally of the grooves but restricting lateral and vertical movement thereof, a pinion mounted on the upper side of said bars and a pair of racks having one of their ends pivotally secured to the lower surface of said sections and engaging opposed portions of said pinion.

'7. An extension table having a top formed of a plurality of sections, a pair of parallel spaced channel bars having longitudinally extending slots therein, broader at the bottom than at the top, a plurality of members pivotally mounted on the lower surface of the sections and having enlarged portions disposed in the enlarged portions of said grooves permitting movement of the members longitudinally of the grooves but restricting lateral and vertical movement thereof and single means for supporting said pinion and holding said racks in engagement with said pinion.

8. An extension table having a top formed of a plurality of sections, a pair of parallel spaced channel bars having longitudinally extending slots therein, broader at the bottom than at the top, a plurality of members pivotally mounted on the lower surface of the sections and having enlarged portions disposed in the enlarged portions of said grooves permitting movement of the members longitudinally of the groove but restricting lateral and vertical movement thereof, a bracket disposed transversely of each bar for supporting the pinion and having hooked portions on its ends forming slides, and a pair of racks pivotally secured to each top section and mounted in said slides and engaging said pinion.

CHARLES L. CREECH, JR.