US335453A - Extension-table - Google Patents

Description

T. B. HENNESSY.

EXTENSION TABLE.

No. 335,453. Patented Feb. 2, 1886.

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THOMAS E. HENNESSY, OF CHICAGO, ASSIGNOR TO SAMUEL DINGEE, OF \VILMETTE, ILLINOIS.

EXTENSION-TABLE.

SPECIFICATION forming part of Letters Patent No. 335,453, dated February 2, 1886.

(No model.)

To (til whom it may concern.-

Be it known that I, THOMAS B. HENNEssY, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful 5 Improvements in Extension-'lables; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The object of my invention is to provide means for keeping the sliding bars ofextension- 1 tables closely together, and to avoid the possibility oftheir locking by reason of the swelling of the wood.

In the drawings, Figure 1 is a side elevation of one of the sliding bars. Fig. 2is a plan view of the same. Fig. 3 is a vertical transverse section taken on the line a 00, Fig. 2. Fig. at is a perspective view of a couple of bars in position to be united. Fig. 5 is a detail view showing in perspective the spring-plate; and Fig. 6 is a detail view showing the tenon and spring-plate attachment.

' Reference being had to the drawings, A and B represent sliding bars provided with longitudinal T grooves ormortises a, and provided at one end wit-h a tenon, C, which closes said mortises at one end of said bar. That part of the body of the tenon C which is within the mortise corresponds in shape-thereto; but the part thereof that projects from the bar is minus the flanges which would convert it into a T- shaped tenon, and adapt it to fit snugly the T-mortise of the engaging sliding bar B. The top of this tenon O is inclined or beveled from or near its outer end to its inner end, and secured to said inclined surface is a spring-plate, D. This plate D extends beyond one or both of the vertical sides of the tenon O a distance corresponding to about the depth of the lateral grooves of the T-mortise of the engaging bar 45 B. Thus, as shown in Fig. 4, as the tenon is inserted into the T-mortise of the engaging bar the side edges of the plate D will enter the lateral grooves of the same and hold the two bars closely together. If desired, the bev- 50 cling of the tenon may be dispensed with, and

the plate D extended a suitable distance in front of the inner end of the tenon, and bent downward slightly, so as to have about the same declination as the bevel of the tenon, as

hereinbefore stated. 5 5

The spring-plate D is secured to the tenon 0, preferably by a screw, d, which passes through a suitable aperture near its outer end and into the tenon. In order to prevent the plate from oscillating, I make a V-cut in it, preferably between the screw d and the outer end of said plate, and then turning the bradb thus formed downward drive itinto the tenon, as shown. A small screw or nail will answer just as well. and can be used-instead ofthe brad 6- b, if desired.

In order to facilitate the entrance of the inner or advanced edges of the spring-plate D intothe lateral grooves of the T-mortise a when the bars are being united, as shown in Fig. 4, 70 and to insure an easy movement of said edges in the grooves, I curve the corners ccnpward slightly. If the wood of which the barsAand B and the tenons G are made swells vertically, because of the prevalence of moisture, this spring-plate D will give suificiently to accon1- modate this swelling. In order to accommodate any lateral swelling, I can make the tenon narrower than the groove it enters. In Fig. 5 is shown a modified form of this plate D. It has lateral cuts made near its innerend, forming leaves 6 e, which are turned downward. This plate is secured to the tenon in such position that the leaves 6 0 will be in advance of the tenon, and. will press outward against the sides of the mortise in which it moves, thus accommodating any lateral swelling of the wood. The corners left by the forming of leaves e a may be turned slightly upward, if desired, as shown. 9C

The construction of the sliding bars I lay no claim to, but suffice it to say their construction and operation are the same as those now in current use.

I am aware of the existence of Letters Patent No. 257,274, granted May 2, 1882,in which the tongue is made entirely of wood, havinga longitudinal oblique slot in it to give it spring, and also of Letters Patent No. 183,276, granted October 17, 1876, in which the tongue is divided centrally at right angles to the bottom of the groove, and a rubber cushion or a metallic spring placed between the divided parts.

My invention differs from the construction of the patented inventions referred to in details hereinbefore described and illustrated, and as pointed out in the claims.

What I claim as new is 1. The combinatiomwith the sliding bars of extension-tables having longitudinal mortises in their engaging surfac'es,of the tenons adapted to enter said mortises, and the metallic spring'plate D, said plate having the corners of its advanced or inner end slightly curved upward.

2. The conibination,with the sliding bars of extension-tables having longitudinal mortises in their engaging surfaces, of a tenon having its inner end tapered or beveled, and the metallic springplate D, secured to said tenon.

3. The combination, with the sliding bars of extension-tables having longitudinal mortises in their engaging surfaces, of the tenons adapted to enter said mortises, and the metallic spring-plate D, substantially as set forth. 25

4. The combination, with the sliding bars of extension-tables having longitudinal grooves in their engaging surfaces, of the tenon 0, metallic spring-plate D,and screw d, said plateD having a V-cnt therein, forming a brad,which 50 is driven into said tenon to prevent the plate D from oscillating.

5. The combination,with the sliding bars of extension-tables having longitudinal mortises in their engaging surfaces, of the tenon 0, me- 3 5 tallic plate D, having the downwardly-turned leaves 6 e, and means for securing said plate to said tenon.

In testimony that I claim the foregoing as my own I hereunto affix my signaturein pres; o ence of two witnesses.

THOMAS E. HENNESSY.

Witnesses:

EDWARD W. SOHIRACH, FRANK D. THOMASON.

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