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Publication numberUS934861 A
Publication typeGrant
Publication dateSep 21, 1909
Filing dateJan 30, 1909
Priority dateJan 30, 1909
Publication numberUS 934861 A, US 934861A, US-A-934861, US934861 A, US934861A
InventorsJens Vaaler
Original AssigneeClemetsen Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Type-writer desk.
US 934861 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

J'. VA ALER" TYPE WRITERDESK.

APPLICATION FILED JAN.30, 1909.

Patented Sept. 21, 1909.

Je /a5 dealer.

3 SHEETS-SHEET l.

wimeasal W J. VAALER.

TYPE WRITER DESK.

APPLICATION FILED JAN. 30. 1909.

Patented Sept. 21, 1909.

3 SHEETS-SHEET 2.

Z jfibeacieax J VAALER TYPE WRITER DESK.

nrmonlon nun JAR. so, 1909.

Pabgnted Sept 21.1909;

. a suns-4x1212 1- a.

E QQ m Q- I I 'pivotally connected' by acur'ved link 28, and the parts are so proportioned and arranged that whenthe platform is either in its housed and lowered, or withdrawn and raised, position, each link 28 will rest upon the hub portion of a'bell-crank, as shown in Figs 2 and 3, inv which-figures these hub-portions f are indicated by dotted lines surrounding the fulcrums 17. 'The tension of the springs 26,

which is exerted upon the rod in the directlon toward the rod 24:, is so proportioned to the weight of the typewrit-ing-machine as to act 'as a counter-balance for the same, though not to quite equal its weight. When the platform is in its lowermost and' housed position it is locked therein so that it 'cannot be raised until it has first been vdrawn vforward,'-wl'ien, upon reaching'its limit of forward movement, it is automatic ally unlocked to permit the platform to be raised for bringing the machine int-o operforming a shoulder 36. The cleat is so positioned as to permit the lip' 32 to bear against while the recess 31 engages the depending arm 116 of the adjacent rear bellcrank (see Fig. 5) which'locks the latter.

against turning on its fulcrum with the re sult that the platform is thereby'held inits lowered position. As the platform is drawn forward and the ear 32 passes the shoulder 36, one of the cam-faces 33 of the lever 30 encounters aca'm-block-37 in its path '(see Fig. 6), rocked on its pivot to disengage it from the bell-crank, wheithe platform.is free to be raised. As the platform is raised each one 7 of the four bell-cranks is inverted about its fulcrum, somewtit beyond the extent of 180, from the position shown in Fig; 2 to that shown in Fig. 3. The arms 116, all 'being of the same length, have a parallel move- -Fig. 2-. The springs,

ment throughout their inversion, sothat the platform is maintained in a horizontal posi tion at all times. 7

With the platform the shaft 25 is past a dead-center, that is, to

one'side of a line drawn through the centers of shaft 24 and the fulcrum 17, as shown in which in this position exerttheir greatest tension, tend toturn the arms 116 backwardly, which movement ischecked by contact of, the hnks with the while theopposite end is tapered to in the manner described is with the result that the arm 'is the cabinet, in its lower positionhub-portions of the adjacent bell cranks. The force of the springs being exerted in this direction, pressure of the arm 116 against the locking-arm is prevented, thereby permitting the latter to be swung freelyupon itsz ivotby contact of its'cam-surface 33' with the cam-block 37.

In the raised position shown in Fig. 3,

the pivot-connections of the arms 116 with the platform are to the rear of perpendicular lines drawn through. the fulcrums 17 of the bell cranks, so that the weight of the typewritin'g-machine is exerted to hold the links 28 against the hub-portions of the other bellcranks, as shown, an the tension of the springs also assists in maintaining the parts in that "position. 4

To lower the platform, itis first pulled forward against thetension of the" springs to carry the pivots which secure the bell-cranks to the platform past lines perpendicular to thefulc'rums 17 ,when the platformisfree to be 'lowered against the constantly increasing tension of the springs, which eases the movement in that direction. As this movement takes place the arm 116 of the forwardbell-crank contacts one of the camsurfaces 33 of the locking-arm 30 to turn the latter on its pivot, thereby disengaging its other end from contact with the shoulder 36, and causing the recess 31 to engage and lock the respective bell-crank, after which the platform is free to he slid back into the housed position shown in Fig. 2 The platform is stopped in this movement by the encounter of the end of the lever 30 with the head 35 (Fig. 7) of the cleat 34.

'The position of the mechanism for aid-- justably supporting a typewriting machine primarily intended to be-on the pedestal of an ordinary 'oflice-desk, as shown; but I do not wish to be understood as intending to limit my improvement to thatparticular connection.

While I have shown and described my invention as applied to a typewriter in a desk,

the same is equally useful for application to other devices adaptedto be used in connectionwith and housed within a cabinet, pedestal or the like, such as a calculating machine, which it -is desired to so -mount within a structure such as those enumerated, as to permitof their quick and ready'withdrawal' therefrom in convenient position for use, and equal facility in returning them within pedestal, desk or similar structure after using, where they are hidden from' view and protected from dust. e

What I claimas new and desire to secure by Letters Patent is 1. In combination with a desk, cabinet, or,

the like, a carriage movably confined therein,

a platform withdrawably housed therein,

a desk-telephone, and other devices I ered and raised'positions of the platform,

whereby said platform-supporting elements are inverted on withdrawing the platform. to raise the platform during such with drawal.

2; In combination with a desk, cabinet, or the like, a carriage movably confined therein, a platform withdrawablyhoused therein, platform supporting elements pivoted on the carriage in a plane between the lowered and raised positions of the platform, where by said platform-supportmg elements are 1n- Yerted on withdrawing the platform to raise the platform during such withdrawal, and

locking-device releasably holding said platform-supporting elements.

3. In combinatio n with a desk, cabinet, or the like, a carriage movably confined therein, a plat-form withdrawably housed therein, a track for the carriage, and a pair of platform-supporting levers 'fulcrumed to each side of the carriage in a plane between the lowered and raised positions of the platform, whereby said levers are inverted on withdrawing the platform to raise the platform during such withdrawal.

t. In combination with a desk, cabinet, or the like, a track therein, a carriage riding on said track, a pair of bell-cranks fulcrumed at their angles to each side. of the carriage, a link'connecting the members of each of said pairs, at their shorter-arms, and a platform pivotally supported on the longer bell-crank arms the tulcrums of said arms being in a plane between the lowered and raised posit-ionsof' such plat-form, whereby said levers are inverted on withdrawing the platform tora-ise the plattorm dnrlng such W ithd ra wal.

upwardly extending rear arms at which the sides are connected, a pair of bell-cranks tulcrumed at their angles to each carriageside,-a link connecting the members-of each of said pairs at their shorter arms, a platform pivotally supported on the longer bellcrank arms, and springs connecting said longer arms with the carriage, for the purpose set forth.

6. In combination with a desk, cabinet or the like, a track therein, a carriage riding on said track, a pair of bell-cranks fulcrumed to each side of the 'rarriage, a link coxmecting the members of each of said pairs at their shorter arms, a platform pivotally supported on the longer bell-crank arms, a locking-lever fulcrumed between its ends on th-ecarriage to swing laterally and adapted to interlock at one end with a longer bellcrank arm and provided on its opposite end with a cam-head, and an abutment in the path of said head, for the purpose set forth.

T. In combination with av desk, cabinet-or the like, a track therein, a carriage riding on said track, a pair of bell-cranks t'nlcrumed to each side of the carriage, a link connect.- ing the members ofeach of said pairs at their shorterarms, a platform pivotally supported on the'longer bell-crank arms,- a cleat extendingalong an inner side of a pedestal andprotided with an offset in its forward end, a lever fulcrumed between its ends on the carriage to swing laterally, with an oftset in its rear end to engage a longerbellcrank arm, a lip adjacent to said offset to bear againstthe cleat, and a cam-head on its 'l orwardend, and an abutmentin the path of said head, for the purpose set forth.

JENS VAALER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2678862 *Oct 1, 1951May 18, 1954Nat Office Supply Mfg Co IncTypewriter support
US4616798 *Feb 26, 1985Oct 14, 1986Haworth, Inc.Adjustable support for CRT keyboard
US5257767 *Jul 21, 1992Nov 2, 1993Waterloo Furniture Components, Ltd.Adjustable support mechanism for a keyboard platform
US6883764Jul 19, 1999Apr 26, 2005Humanscale Corp.Keyboard support mechanism
US7841569Mar 20, 2006Nov 30, 2010Humanscale CorporationKeyboard support mechanism
US7841570Oct 21, 2008Nov 30, 2010Humanscale CorporationKeyboard support mechanism
US20100200712 *Apr 7, 2010Aug 12, 2010Humanscale CorporationKeyboard Support Mechanism
Classifications
Cooperative ClassificationA47B21/02