US1647224A

US1647224A - Extension table

Info

Publication number: US1647224A
Application number: US615120A
Authority: US
Inventors: Edward A Henricson
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-01-26
Filing date: 1923-01-26
Publication date: 1927-11-01
Anticipated expiration: 1944-11-01

Description

Nov. 1, 1927. 1,647,224

E. A. HENR ICSON EXTENSION TABLE Filed Jan. 26, 1923 2 Sheets-Sheet. 1

INV

I ATTORNEYS.

Nov. 1, 1927. I 1,647,224

E. HE/NRICSON EXTENSION TABLE Filed Jan. 26, 1923 2 Sheets-Sheet 2 INVENTOR.

ATTORNEYS. I

Patented Nov. 1, 1927.

UNITED. STATES EDWARD A. HENRICSON, CHICAGO, ILLINOIS.

EXTENSION TABLE.

Application filed January 26, 1923. Serial No. 615,120.

The mority of extension tables now in use are required to be pulled apart, one section in one direction, the other section in the opposite direct-ion, necessitating two persons to achieve the operation, therefore the purpose of the present invention is to provide an improved mechanism to facilitate the extensibilit'y and closing of extension tables, accomplishing the result by one operator.

Another purpose is to provide a mechanism of this kind including a pair of oppositely reciprocating racks guided in a floating frame, with a lever having reversible means cooperating with the racks, whereby said racks may be moved in opposite directions, for separating or closing the table halves or sections.

Still another purpose is to provide means for automatically reversing the reversible means, when the operating lever reaches the limit of its movement in'either direction.

A further purpose is the provision of means for locking said reversible means, 1n order to hold them in engagement with said racks, as the operating lever is moved.

A still further purpose involves means to permit of free and'easy reciprocating movements of the racks, and also means for disposing the outer end of a section of the operating lever sufficiently low to clear the depending rim or apron which is usually adjacent the margin of the table, so that the lever may hand.

herein given are in no way limitive and while still keeping within the scope of the invention any desired modification of detail and desired proportions may be made in the apparatus according to circumstances.

The invention comprises further features and combinations of parts as will be hereinafter set. forth, shown in the drawings and claimed.

In the drawings:

Figure 1 is a bottom plan view of an extension table showing the application of the improved mechanism for facilitating the extensibility of the two table halves 0r sect-ions;

Fig. 2 is a similar view showing the two table halves or sections extended;

Fig. 3 is a sectional view on line 38 of Fig. 2, also showing the table halves or sections extended.

Fi 4; is a sectional. view on line 4- 1.- of

be easily and quickly operated by i It is to be understood that the particulars stud 23.

Fig. 2, more clearly showing the various parts of the mechanism.

Fig. 5 is a perspective view of the floating frame with the racks guided therein.

' Fig. 6 is a perspective View of the operating lever and the reversible means for reciprocating the racks.

Referring to the drawings, 1 and 2 designate the two table ha ves or sections of the table, to which the slides 3 and 4 are secured as at 5 and 6. The slides are tongue grooved or dovetailed together, as shown at 7, to

guide and hold the table sections or halves in alignment, as the sections are separated and closed.

In order to facilitate the separation of the table halves or sections, racks 8 and 9 may be secured to the table halves or sections 1 and 2, in any suitable manner, preferablyloy screws 10. To connect and guide the racks, the table sections are moved towards and away from each other, floating frame 11 is provided, being preferably Hshaped, having its opposite edges rabbeted to seat the racks 8 and 9. These rabbets 12 have pockets 18, wherein anti-frictional rollers 14 are journalled upon pins 15. The rollers are provided for the purpose of facilitating the reciprocating movements of the racks. Plates 16 are secured by any suitable means, preferably by rivets 17 to the frame 11 for the purpose of covering the racks and holding them seated in the rabbets 12. The plates 16, at their corresponding ends, termi nate in

cams

18 and 19, constituting means to automatically reverse the rack operating means, as will be hereinafter described.

The object is, with the frame 11 stationary to reciprocate the rac 8 and'9 in one or the other direction by means of a lever 20, so as to open or close the table halves or sections. In order to impart intermittent move ments to the racks and table halves or sec tions, the operating lever 20 is given a series of oscillatory strokesv This lever 20 com prises a base section 21 and a handle section 22, which are mounted pivotallyon a screw Both sections of the lever are aligned parallel, the handle having an elongated slot 24, through which the reduced threaded shank of the screw stud 23 passes. The shank of the stud 23 also engages through the base section of the lever and is threaded into the frame 11, thereby pit? otally supporting the lever. Pawls 25 and 26 are mounted on pivots 27, which are carried by the opposite ends of the base section 21 of the lever. Both ends of each pawl are pointed and are adapted to cooperate with racks. hen oscillatory movements are imparted to the lever diagonal opposite ends of both pawls engage with the teeth of the racks 8 and 9, in the manner shrown in Figures 1 and 2, causing the racks to reciprocate step by step, either to separate or close the table sections. To cause the pawls to operate in unison, a bar 28 pivotally connects corresponding end portions of the pawls, and is provided with a centrally disposed headed stud 29. Passing through the slot 2% is a headed stud 30, which insures holding the base and handle sections of the lever in alignment. The shank of the stud 80 is threaded into the base section of the lever.

Projecting from one edge of the slotted end of the handle section of the lever is an arm 81, the end portion of which is provided with a bifurcation 32, which receives the shank of the stud 29, the arms caused to be formed by the bifurcation engaging under the head of the stud serving to maintain the handle in inoperative position as shown in Figs. 1 and 2, and also to prevent outward movement of the bar 28 which would result in the disengagement of the pawls and 26 from the rack bars 8 and 9.

Carried by the pawls, between the pivots 27 and the pivots of the bar 28, are pins 33 and 3 1, which cooperate with the

cams

18 and 19 for the purpose of reversing the pawls.

Supposing the extensible table is closed, as in Figure 1, and it is desired to separate the table halves, the operating lever is first positioned, as in said figure, and upon so placing the lever the pin will engage with the cam 19, causing the pawls 25 and 26 to tilt until their ends and 36 engage the teeth of the racks. The handle end of the handle sec tion of the lever may then be moved in the direction of the arrow (1., (in Figure 1) the lever being oscillated sufficiently in such manner until the racks have been moved the desired distance and the table halves or sections separated or spaced to receive the necessary extra leaves. TTowever the lever can not be oscillated, as long as the bifurcation of the arm 81 remains in engagement with the stud 29 and the extremity of the handle end of the handle section is within the rim or apron 37 of the table. In fact the engage ment of the bifurcated arm with the stud 29 keeps the lever well inside of said rim or apron 37. In order to operate said lever, the handle end of the handle section of the lever is first sprung downwardly sufliciently and then drawn or pulled longitudinally outwardly and due to an inclined block or cam 38 (which is carried by the base section 21 of the lever) the handle section of the lever is held sufficiently below the rim or apron 37, whereby the lever may oscillate as previously set forth. The pawl ends and 41 are adapted to be engaged with the rack bars 8 and 9 as will be hereinafter described when it is desired to close the table sections.

It should here be stated that a spring 39, the ends of which are connected with the stud 29 of the bar 28 and the stationary stud 23, serves to yieldably hold said bar 28in such a position as to normally maintain the rack engaging pawl ends clear of the rack bars. Thus the pawl ends will only be engag-ed with said rack bars by the action of the

cammed surfaces

18 and 19 operating against the

pins

33 and 34, respectively, the lever section 22 being movable bodily in either direction to engage the desired

33 or 34 with its cammed surface according to whether the table sections are to be closed or opened.

After the sections 1 and 2 have been spread, the handle section 22 will again slid inwardly to inoperative position as shown in Figs. 1 and 2.

When the table halves or sections are in their open positions and it is desired to close them, the lever is moved until the pin 33 of the pawl 25 engages the cam 18; causing the pawls to oscillate until their ends 40 and 411 engage the racks. Repeated oscillatory movements of the lever in such wise will cause he racks to move sufficiently to close the table halves. The function of the spring 39 in normally tending to maintain the pawl ends 40 and 41 out of engagement with the rack bars at the end of each stroke is very important at this point since otherwise after the table sections 1 and 2 have been closed it would be necessary to crawl under the table in order to disengage the pawls and reverse the position thereof in order to reopen the sections since the ends 40 and 41 would prevent movement of the lever handle in a clockwise direction to engage the pin 3 1- with its cam surface 19 for engaging the pawl ends 35 and with the raclt. V

The proportions and arrangement of the various parts may appear. as requirin strokes of considerable distance on the para of the lever and pawls. However. the mechanism may be made with parts so anged and proportioned that the lift of the pawls will be slight and the strokes of thelever relatively short, hence, no appreciable tend-- ency to keep the pawls out of engagement with the racks will be experiences. Furthermore, the pawls will be frictionally held in engagement with the racks during a working stroke of the lever handle 22. It is ohvious, that when the table halves are in their open positions the operator opera e the bar 28 by inserting the hand through the space between the table sections. When the bar 28 is grasped by the hand it maybe shifted and the entire lever oscillated until the table sections are almost closed, then the handle section of the lever may be grasped and operated, as in the first instance When the table sections are partly open, the bar :28 may be grasped and the entire lever actuated to further open the table halves.

Having set forth the invention, what is claimed is:

1. in an extension table, opposed extensible table halves, means including a pair of parallel movable racks, floating means for extensibly and operatively connecting said halves. and oscillatory means provided with reversible pawls operatively engaging with the racks to move them in one or the other direction, whereby the table halves are separated or closed.

2. in an extension table, opposed extensible table halves, means including a pair of parallel movable racks extensibly and operatively connecting said halves, and oscillatory means provided with reversible pawls operatively engaging with the racks to move them in one or the other direction, whereby the table halves are separated or closed, and means carried by said oscillating means for locking the pawls and preventing movement of the oscillatory means, thereby preventing separation of the table halves.

3. In an extension table, opposed extensible tablehalves, means including a pair of parallel movable racks extensibly and operatively connecting said halves, and oscillatory means provided with reversible pawls operatively engaging with the racks to move them in one or the other direction, whereby the table halves are separated or closed, means for locking the pawls and preventing movement of the oscillatory means, thereby preventing separation of the table halves, said oscillatory means including a longitudinally movable handle section, which also constitutes a part of the locking means, and means for bending the handle section downward clear of the rim or apron of the table, whereby the handle section may be moved longitudinally for unlocking the pawls and the oscillatory means.

4. The combination with opposed extensible table halves, of a pair of parallel reciprocating racks connected to and movable with said table halves, means floating extensibly and operatively connecting said racks, an oscillatory device mounted on said floating means and provided with double acting pawls engaging with and imparting reciprocating movements to the racks for separating said table halves.

5. The combination with opposed extensible table halves, of a pair of parallel reciprocating racks connected to and movable with said table halves, means extensibly and operatively connecting said racks, an oscillatory device mounted on said means and provided *ith double acting pawls engaging with and imparing reciprocating movements to the racks for separating said table halves, and means carried by said rack connecting means for reversing the pawls for reversibly engaging with and imparting reciprocating movements to the racks in the opposite directions for closing said table halves;

6. The combination with opposed extensible table halves, of means including a pair of parallel movable racks extensibly and operatively connecting said halves, oscillatory means provided with reversible pawls operatively engaging with and reciprocating the racks in directions to cause separation of the table halves, and means controlled by said oscillatory means for automatically reversing said pawls for reversibly engaging with and reciprocating the racks in the opposite directions for closing said halves.

7. The combinationwit-h opposed extensible table halves, of means including a-pair of parallel movable racks eXtensibly and 0peratively connecting said halves, oscillatory means provided with reversible pawls operatively engaging with and reciprocating the racks in directions to cause separation of the table halves, means controlled by said oscillatory means for automatically reversing said pawls i'or reversibly engaging with and reciprocating the racks in the opposite directions for closing said halves, and means for locking the pawls in either of their positions and preventing movement of the oscillatory means, thereby preventing movement of the table halves.

8. The combination with opposed extensible table halves, of means including a pair of parallel movable racks extensibly and operatively connecting said halves, oscillatory means provided with reversible pawls operatively engaging with and reciprocating the racks in directions to cause separation of the table halves, means for automatically reversing said pawls for reversibly engaging with and reciprocating the racks in the opposite directions ior closing said halves, means for locking the pawls in either of their positions and preventing movement of the oscillatory means, thereby preventing movement of the table halves, said oscillatory means including a longitudinally movable handle section, which also constitutes a part of the locking means, and means for bending the handle section downward clear of the rim or apron of the table, whereby the handle section may be moved longitudinally for unlocking the pawls and the oscillatory means.

9. The combination with opposed extensible table halves, of means including a pair of parallel movable racks extensibly and operatively connecting said halves, an oscillatory operating lever mounted on said means, double acting pawls carried by. the opposite ends of said lever for cooperating mounted for longitudinal movement on and for operating said lever.

10. The combination with opposed extensible table halves, of means including a pair of parallel movable racks 'entensibly and op- 5 eratively connectin said halves, an oscillatory operating lever mounted on said means, double acting pawls carried by the opposite ends of said lever for cooperating with and reciprocating said racks in one direction for separating said table halves, means connecting said pawls to cause them to move in unison, and a handle section mounted for longitudinal movement on and for operating said lever, said handle section clearing the rim or apron of the table to prevent collision with the latter.

11-. The combination with opposed extensible table halves, of means including a pair of parallel movable racks extensibly and operatively connecting said halves, an oscillatory operating lever mounted on said means, double actinp; pawls carried by the opposite ends of said lever for cooperating with and reciprocating said racks in one direction for separating said table halves, means connecting said pawls to cause them to move in unison, a handle section mounted for longitudinal movement on and for operating said lever, and means carried l y the handle section and cooperating with said connecting means to lock said pawls.

12. The combination with opposed extensible table halves, of means including a pair of parallel movable racks extensibly and operatively connecting said halves, an oscillatory operating lever mounted on said means, double acting pawls carried by the opposite ends of said lever for cooperating with and reciprocating said racks in one direction for separating said table halves, means connecting said pawls to cause them to move in unison, a handle section mounted for longitudinal movement on and for op erating said-lever, and means for automatically reversing said pawls, whereby said pawls may engage with and reciprocate said racks in opposite directions for closing said table halves.

nee/32.2

13. The combination with opposed extensible table halves, of means including a pair of parallel movable racks extensibly and operatively connecting said halves, an oscillatory operating lever mounted on said means, double acting pawls carried by the opposite enos oi said lever for cooperating with and reciprocating said racks in one direction for separating said table halves, means connecting said pawls to cause them to move in unison, a handle section mounted for longitudinal movement on and for operating said lever, said handle section being engageable with the rim or apron of the table to prevent movement of the lever, means for bending the handle section clownward clear ot the rim or apron of the table when the handle is moved longitudinally, whereby said lever may oscillate, and means for automatically pawls, whereby they may engage with and reciprocate said racks in opposite directions "tor closing said table halves.

M. The combination with opposed table reversing said halves or sections, of a compound pawl and rack mechanism operatively and extensibly necting said halves or sections, whereby said halves may be extended or closed, said mechanism including an oscillatory operat ing lever, a' support therefor, and cam means carried by said support for reversing said pawls.

15. The combination with opposed table halves or sections, of a compound pawl and rack mechanism operatively and extensibly connecting said halves or sections, whereby said halves may be extended or closed, said mechanism including an oscillatoryand extensible operating lever, and means efiective upon lengthwise movements of said lever for locking said 'pawls and means for locking said mechanism.

16. The combination with opposed table halves or sections, or" a compound pawl and racl: mechanism operatively and eXt-ensibly connecting said halves or sections, whereby said halves may be extended or closed, means for locking said mechanism, means for unlocking said locking means, and means for automatically reversing the pawls, when aid locking means is released.

In testimony whereof I afiiX my signature,

EDl VARD A. HENRICSON.