US1004961A - Extension-table. - Google Patents

Description

A. J. ANDERSEN. EXTENSION TABLE. 11110111011 FILED APR. 11, 1908. RENEWED D110. 23, 1910.

1,004,961. Patented 0111.3, 1911.

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VVJ WITNESSES COLUMBIA I'LANOGRAPII cu. WASHINGTON. u. c.

A. J. ANDERSEN.

EXTENSION TABLE.

APPLICATION FILED APB.17, 1908. RENEWED DBO. 23, 1910.

Patented Oct. 3, 1911.

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A. J. ANDERSEN. EXTENSION TABLE. APPLICATION FIL D APR.17, 190a. RENEWED DEC. 23, 1910. 1,004,961

Patented Oct. 3, 1911.

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ANDERS J. ANDERSEN, OF PHILADELPHIA, PENNSYLVANIA.

EXTENSION-TABLE.

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Specification of Letters Patent.

Patented Oct. 3, 1911.

Application filed April 17, 1908, Serial No. 427,584. Renewed December 23, 1910. Serial No. 599,017.

T 0 all whom it may concern:

Be it known that I, ANnnRs J. ANDnRsnN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement in Extension-Tables, of which the following is a specification.

My invention relates to new and useful improvements in extension tables and has for its object to provide an exceedingly simple and effective construction for extending and contracting a table by screw action.

A still further object of my invention is to provide for the extension leaves forming a permanent part of the table and a still further object of my invention is to construct and arrange these leaves so that they may be raised or lowered and be brought into alinement with the upper surface of the table when adjusting them in place.

WVith these ends in view this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same I will describe its construction in detail referring by letter to the accompanying drawing forming a part of this specification, in which- Figure 1 is a perspective of my improved table showing it fully extended and also showing it as being provided with a central 1 split standard as well as a split leg, Fig. 2

a perspective of the top of the table showing one of the leaves turned under prior to eX- tending the table, to the extent of one leaf. Fig. 3, is also a perspective of the top of the table showing the leaves folded lowered and swung at an angle for passing beneath the top. Fig. 4: is a perspective of the table turned up side down showing-the operating mechanism. Fig. 5 a perspective of the top having a portion broken away and illustrating the mechanism for raising and lowering the leaves. Fig. 6 a detail section of a portion of the operating screw showing the key fitted 'to' slide therethrough and a collar threaded upon the shank of the screw the key rod being square in cross section. Fig. 7 an end view of the collar showing the friction rolls journaled therein. Fig. 8 a section at the line X-X of Fig. 7. Fig. 9, is a detail section of a portion of the central support showing the spring for permitting a limited longitudinal movement upon the operating screw. Fig. 10 a detail view of the key for operating the key rod. Fig. 11 a View showing the dowel pins and the sleeves. Fig. 12 a detail view of the lifting cams and truss bar plate and crank shaft.

In carrying out my invention as here embodied, A and A represent the two sections of the table proper, having the usual rails B and to these rails are secured the cross strips O in which are set the guide rods D for guiding the sections A and A in extending and contracting the table and these rods also pass through the central support E on which is secured the central leg F and are sufliciently loose to slide in their bearings.

G represents the operating screw, a central blank portion of which passes through the central support and is retained therein by the collar G which is secured upon the screw between the two plates G while at the same time said support has also a limited movement upon this portion of the screw but is normally held in the position shown in Fig. 9 by the spring H interposed between the collar and one of the plates G the object being to permit the central support to have a limited movement relative to the sections A and A so as to properly adjust the leaves in place. One portion of the operating screw is provided with a right hand thread while the other portion is provided with a left hand thread, and these threaded portions pass through suitable nuts located in the cross strips C3,.so that when the screw is turned the sections A and A of the table will be either moved away from or toward each other as the case may be as will be readily understood.

I represents the key or crank for turning the operating screw and while this key may be of any construction I have here shown it as being made of two sections hinged together at I so that the outer section may be turned in upon the inner section and thus lie concealed and be out of the way when not in use, this key is attached to the key rod (Z.

J represents the extension leaves, which consist of several leaves hinged together, the central leaf having secured to its under side the truss bar K, through the center of which passes the stud L which latter is secured to the central support E. The under side of this truss bar is provided with a circular plate M which rests upon the lifting cams N the latter being secured upon the crank shaft set in the central support, and these cams are held by friction against retrograde movement while the leaves are being adjusted.

0 represents a crank which is secured upon the crank shaft 0 and by the proper turning of this crank the cams N will raise or lower the truss bar as the case may be and thus change the level of the extension leaves to correspond with the level of the top of the sections A and A of the table.

The operating screw is reduced and threaded as indicated at at having the collar 0 threaded thereon and the key rod (Z may be fitted on this collar in any suitable manner but I have here shown that portion which passes through the collar as square in cross section the opening in the collar being square and to reduce the friction upon this rod I journal rolls 6 in the collar in such manner that they bear upon the sides of the rod thus permitting the collar to freely slide upon the rod while at the same time turning with the same. The object of the key rod sliding in the collar is to permit the g0 and come of the operating screw without affecting the key rod.

In order that there should be no wear upon the wood where the dowel pins are located I provide the metallic sleeves f which fit in the edges of the top of the table and the leaves and through which the dowel pins 9 pass said pins being of suflicient length to be driven into the wood back of the sleeves.

When the table is to be fully extended the operating screw is so manipulated so as to force the sections A and A outward to their limit after which the sectional leaves are unfolded and the crank O manipulated to raise these leaves to their highest point when they will be 011 a level with the top of the table after which it is only necessary to draw the sections A and A toward each other sufficiently to bring the usual dowel pins in each of the dowel holes and thus clamp the leaves in position as clearly shown in Fig. 1.

Should it be desired to cut out one section of the folding leaves, this section is folded under as shown in Fig. 2 after which the sections A and A are drawn closer together to again clamp the leaves in position, when this last named change is made it is not necessary to change the level of the leaves.

Should it be desired to cut out two of the sections of the leaves the opposite end section is turned under as above described and the sections A and A are again further drawn together. The length of the table may be still further contracted by folding in more of the sectional leaves as shown in Fig. 5, when by lowering the leaves by the proper manipulation of the crank 0' these two sections will be brought on a level with the top of the table, and by the proper manipulation of the operating screw the screws on the table will clamp the leaves as before described.

When it is desired to entirely cut away the sectional leaves the sections thereof are folded as shown in Fig. 3 and the lower end is swungsidewise upon the stud as shown in Fig. 3, when the sections of the table are drawn together the leaves will pass beneath the top of the table and be housed in a clearly shown in Fig. 4.

From the foregoing description it will be obvious that the table when contracted may be readily adjusted to various lengths and when so adjusted will be as rigid as though it were not adjusted and these adjustments are made by the operating screw and require no great amount of physical effort and as the leaves are also retained with the table they do not require to be moved and stored when not in use as is usually the case in this class of tables.

In Fig. 1 I have shown pedestal sections A and A which may be used to support the table when the latter is of considerable size, but may be omitted if desired.

()f course I do not wish to be limited to the exact construction here shown, as this may be varied within certain limits without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new and useful, is

1. An extension table, the combination of two sections, rods for guiding said sections in their movements toward and from each other, a central support, a double threaded operating screw passing through said central support, a collar secured upon the screw, two plates secured to the support between which said collar is confined, allowing a limited longitudinal movement of the support upon the screw, nuts carried by the sections into which the operating screw is threaded, sectional leaves pivoted to the central support so as to have a vertical movement and means for raising and lowering said leaves, as specified.

2. In a table of the character described, two sections adapted to move toward or from each other, rods for guiding said sections, a central support through which said rods pass, an operating screw 7 passed through said central support and having a longitudinal movement therein, a collar secured on said screw, two plates secured to the sides of said support for limiting the tional leaves pivoted upon said stud, cams mounted on said central support for raising and lowering said leaves and means for operating said cams, as specified.

3. In a table of the character described, the combination of two sections, cross strips secured to said sections, nuts secured to said cross strips, a double threaded operating screw adapted to run in said nuts, a key rod fitted to slide in the operating screw and adapted to turn the latter, a key attached to the outer end of the key rod, a central support through which the operating screw passes, a collar carried by the screw, said collar being located within a recess formed in the central support, a spring adapted to bear against said collar and one wall of the recess to determine the normal position of the central support relative to the screw, a stud projecting upward from the central support, sectional leaves, a bar secured to one of said leaves, said bar being pivoted upon said stud, a plate secured to said bar, cams upon which the plate rests and adapted to raise and lower the leaves for alining them with the upper surface of the table, a crank shaft journaled in said support upon which said cams are secured, and a crank secured to the outer end of the crank shaft, as and for the purpose set forth.

4:. In a table of the character described, the combination of two sections, cross strips secured to said sections, rods passed through the cross strips for guiding the sections in their sliding movements, a double threaded screw for operating the sections threaded through nuts set in certain of the cross strips, a central support, a stud projecting upward from said support, a bar K pivoted upon said stud so as to have a limited vertical movement, sectional leaves secured upon said bar, a circular plate carried by said bar, cams upon which said plate rests, a shaft journaled in the support upon which said cams are secured and a crank secured to the outer end of said shaft for operating the same to raise and lower the leaves, as specified.

5. In combination, in a table of the character described, two sections adapted to move toward or from each other, a double threaded operating screw threaded into cross strips carried by said sections, a collar threaded upon one end of said screw, a key rod square in cross section adapted to slide through said collar and into a hollow in said screw, and a key secured to the rod for revolving the latter, as specified.

6. In combination, in a table of the character described, two sections adapted to move toward or from each other, a double threaded operating screw threaded into cross strips carried by said sections, a collar threaded upon one end of said screw, a key rod square in cross section adapted to slide through said collar and into a hollow in said screw, anti-friction rolls journaled in the collar and a key secured to the outer end of the rod for revolving the latter, as specified.

In testimony whereof, I have hereunto aflixed my signature in the presence of two subscribing witnesses.

ANDERS J. ANDERS'EN.

Witnesses:

EDw. W. AUsTIN, S. S. WILLIAMSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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