US1493337A

US1493337A - Furniture for typewriter use

Info

Publication number: US1493337A
Application number: US498195A
Authority: US
Inventors: Grandjean Marc
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-09-03
Filing date: 1921-09-03
Publication date: 1924-05-06
Anticipated expiration: 1941-05-06

Description

May 6 1924.

M. GRANDJEAN FURNITURE FOR TYPEWRITER USE Filed Sept. 5, 2 Sheets-Sheet 3 I LU A 'JZZMQQZZOZ' 21 a2? fizzm?ieazz X1 ffazzayS Patented May 6, 1924.

UNITE. STATES TE T OF-IC' IMAIRC GRANDJEAN, 0F PARIS, FRANCE.

FURNITURE FOR TYPEwRITER USE. 7

' Application filed September a, 1921. Serial No. 493,195.

and useful Improvements in Furniture for Typewriter Use, of which the a specification. I

My invention relates to improvements in following is furniture fortypewriter use, and more particularly to an arrangement of movable shelf or base supportingthe machine whereby the latter may be caused to disappear within the piece of furniture wth great facility when not in use." To this end the piece of furniture is provided with a suflicient recess to receive the said base together with the machine mounted thereupon, the base being connected with the upper part of the said recess by swinging arms forming at each "base and of the typewriter supported thereupon are disposed in the following manner. The cleats or supports 7 are secured below side a sort of articulated parallelogram whereby the said base or shelf may be moved; while retaining the parallel position. The

movements are facilitated by the action of springs or weights acting upon the said base or upon the suspension arm thereof insuch manner as to suitably counterbalance the weight of the machine and base. The invention also comprises special locking devices for securing the said base in the ex treme positions, and releasing devices operated by hand or by pedal for disengaging the said-base.

The piece of furniture is preferably 'constructed in the form of a table, andthe shelf or base is supported'in such manner as to take a position either entirely below the table top or entirely in front of the'lar.

ter and on a somewhat lower level. 'How-.

ever, it is obvious that' thecsaid piece of furniture may be given any suitable form and that the shelf or base may be drawn out at any side thereof;

The following description together with the accompanying drawings which are given by way of example shows an embodiment of my invention as well as various "details of the locking and releasing devices.

Fig. 1 is a perspective view'of the whole piece of furniture the base disposed within the same and in theinoperative position.

Fig. 2 is a vertical section "of the piece of furniture and the said base in the operative position, showing the suspension and the locking devices; the dotted lines indicate the inoperative position.

Fig. 3 is a perspective view of the said J -base and the suspension devices in the operativeposition', with a modified. form of the, releasing device. a

1 indicates the, table top each side are disposed two suspension arms and 2"theinov- A ablefshelf or base of the typewriter. At

a, b, which are pivoted to the table at '3,

4." The arms aare pivoted to the said base atQ5, and at'6 the arms 6 are-pivotf ed to the arms asupporting the said baseg the

points

3, 4, 5, 6 beingdi'sposed at the angles of a'iparallelogram. The said base will therefore remain constantly .inthe horizontalposition irrespectively, of the posi- .tion of the arms a, Z). The arms a are bent f at an angle so that each is provided with,

an extension piece a. Suitable springs servv ingto compensate the weight of the said the table top, and have pivoted'thereto the arms o'f the parallelogram;.each of the cleats has. mounted thereupon a bearing 8.-

having journaled therein an annularstoppiece 9.. The rod 10 is slidable through the said stop-piece and is pivoted at 1-1 to the arm a The end of the said rod situated opposite the stop-piece. 9 is 'screwthreaded for a ,certain length and carries a nut 12. Y

. Between the stop-piece 9 and the nut 12 is disposeda spring 13 having sufficient power.

When the rod 10 is caused to slide inthe J stop-piece 9, the spring is compressed by will result.-

upon the tabletop, 11 upon the arm a and 14 upon the bearing 8 will n'owlbe situated on the same straight line. The nut 12 which moves together with the rod lO during the rotation of the arm a: occupies the. maximum. position adjacentthe stop piecer; In;

this'fpositio'n', the compression of the spring- "13 between the nut and. the stop-piece isa maximum} but inasmuch' as the points-of articulation are situatedin' a straight line, 7 the moment 'of' rotation exertedupon the r 1 said shelf by the spring will be-null. "As on the other hand the points 5 and .6 of the said base are situated vertically below the points of suspension 3 and 1, the action of gravity has no tendency to move the said shelf or base, and the latter is thus in a position of equilibrium.

As soon as the said base is moved in order to bring the same to the upper position, the weight of the base and the machine on the one hand and the action of the springs 13 on the other hand will give rise to opposite moments of rotation. As the base continues to be raised, the moment of rotation due to gravity will increase. As the articulation 11 of the arm a will deviate from the straight line 314:, the moment of rotation produced by the action of the springs will also increase with the rise of the said base in spite of the gradual diminution of the tension of the springs. It will sufiice to suitably regulate the tension of the springs 13 by means of the nuts 12 in order to obtain the equilibrium substantially in all positions of the base containing the typewriter.

In order to maintain the said base in the upper as well as in the lower position, looking devices have been provided which are disposed partly upon the said base and part-- ly upon the arm a. For this purpose, the extension 0 of each arm a is provided at the end with the pawl 15 which is pressed upon the arm by a spring or a weight and is provided with a tail piece orpedal 16, Fig. 2; upon a cross-piece 17 disposed between the legs of the table is secured a catch 18 serving as a stop-piece for the pawl 15 in the upper position of the said base. When the latter reaches the required position, the pawl engages automatically behind the catch 18 under the action of the spring or the weight. 'To release the pawl it will suffice to press with the foot upon the tail piece 16, after which the base and machine may be lowered.

To maintain the base in this lower position, a hook 19 connected with a spring 20 is secured below the said base. The crosspiece 17 is provided with a projection 21 behind which is engaged the hook 19 under the action of the spring 20 when the base reaches the lower position. In order to facilitate the release of the device when the said'base is in the upper position, the device shown in Fig. 3 may be employed.

The two pawl's 15 engaging the catches 18 are formed as strips secured to a shaft 22 which connects the extended ends 0 of the bent arms a, one of the strips being extended beyond the rod to provide a tail piece 16. The release is effected by hand by means of a drawing button 23 disposed in front of the said base and connected by a rod 24 with a lever 25 pivoted under the base. The free end of the said leveracts the said rod being upon the tail piece 16 of one of the pawls devices used for the engagement and the release of the said base. It should be remarked that the extensions 0 of the arms a constitute stays to uphold the said base in a perfectly rigid manner when the latter is drawn out. This rigidity also results from the fact that the parallelogram 3, l, 5, 6 is not entirely closed as would occur in case the base a were to be raised to the level of the table top Z).

Claims 1. In a piece of furniture, the combination of a table having a top, a movable shelf supporting a typewriting machine, suspension levers joined at one end to the table top and at the other end to the said shelf, the pivot joints being situated at the vertices of a parallelogram-at each side of said shelf, one lever at each side being bent at a right angle, a rod pivoted to said lever near the elbow, a guide disposed upon theframe through which said rod is loosely slidable in a substantially horizontal direction, and a compression spring disposed upon said rod, bearing upon the said guide and serving to practically balance the weight of the loaded shelf in all positions of the same.

2. In a piece of furniture, the combination of a table having a top, a movable shelf supporting a typewriting machine, suspension levers joined at one end to the table top and at the other end to the said.

shelf, the pivot joints being situated at the vertices of a parallelogram at each side of the said shelf, one lever at each side being bent at a right angle, a rod pivoted to said lever near the elbow, a guide disposed upon the frame through. which said rod is loosely slidable in a substantially horizontal direction, a compression spring disposed.

upon said rod, bearing upon the said guide, ivoted to said lever at a point such that t e spring shall be compressed to the maximum when the said shelf is brought back to its recess while at the same time the moment of the thrust of the spring with respect to the pivoting axis of the levers shall be annulled.

In testimony, that I claim the foregoing as my invention I have signed my name in presence ofa subscribing witness.

MARC GRANDJEAN. Witness:

MANUEL CQMPIN.