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Publication numberUS297219 A
Publication typeGrant
Publication dateApr 22, 1884
Filing dateAug 22, 1883
Publication numberUS 297219 A, US 297219A, US-A-297219, US297219 A, US297219A
InventorsAdam L. Anthony
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 297219 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


PatentedApr. 2-2, 1884.




SPECIFICATION forming part. of Letters Patent No. 297,219, dated April 22, 1884. Application filed August 22, 1883. (No model.)

To all whom it may concern:

Be it known that I, A. L. ANTHONY, of Placerville, county of El Dorado, State 01' California,have invented an Improved Lap-Board; and I hereby declare the following to a full, clear, and exact description thereof.

My invention relates to an improved lapboard; and it'consists in sliding sidesorleaves and in hinged corners,whereby the lap'board may be closed up to smaller dimensions, either for convenience in use or transportation.

My invention consists, also, in the details of construction, whereby the parts are made to operate and are adjusted as may be desirable.

The object of my-invention is to provide an extensible lap-board which may be adjusted to different sizes and closed up for transportation. v

Referring to the accompanying drawings, Figure 1 is a perspective view of my lap-board extended. Fig. 2 is a perspective view of same shown closed up. Fig. 3 isatransverse section on line a: m, Fig. 2.

A represents the main center, having the usual portion cut out, as shown at E, for fitting the operator.

Upon each side of the main piece A are hinged the corners B B, adapted to fold over upon the main piece and meet at the center, Fig. 2.

To the upper surface of the main piece A is secured a guide, a, consisting of a brass strip, forming a trackway or channel, as shown. At the inner edges of corners B are similar guides, b, continuing the line of guide a. Upon the upper surface of the main piece A is a similar guide or way, 0.

D D represent the sides. They are together equal to the width of piece A. Across their tops are made extended slots d, which may be protected by suitable metal linings. Near their outer edges are made similar slots, d, Fig. 3. The inner ends of the side leaves, D, move in the guides 12, their slots (1 d passing over pins 6 in the four corners of the main piece A. This is the position shown in Fig. 1 when the lap-board is at its greatest extension. In shutting it up, the sides are pushed in on top of piece A. Their inner edges travel in guide a and their outer ends in guide a, both being directed accurately by the pins 6, past which their slots (2 d travel. The two sides meet in the center of the main piece A,

and the corners B, being now free, may be turned up over the lower portion of the main piece, the device then showing as in Fig. 2. To open it out again, first turn outward the corner-pieces B, and then separate the side leaves, vD, pushing them outwardly. Their lower edges move in guides b on the cornerpieces, and their slots (1 d direct them and detine their limit by coming in contact with the pins 6.

In order to fix the side leaves at any desirable limit, I have the set-screws s, passing down through the guides at and b, and impinging against the sides, to hold them wherever set.

Upon-the guides a. and I), I mark off a yardmeasure and suitable divisions thereof, as shown. This will be of advantage in the convenience it affords in measuring. By reason of this extension of the lapboard it may be conveniently carried about and made to suit the particular use of the occasion or wish of the operator.

Having thus described my invention,what I desire to secure by Letters Patent is 1. A lap-board consisting of the main piece A, having the cut-out portion E, thecornerpieces B B, hinged thereto and adapted to be folded thereon, and the side leaves, DD, sliding upon the corner and main pieces, substantially as herein described. 0

2. The main piece A, having the upper and lower ways or guides, c and a, and the hinged lower corners, B B, having ways or guides b, continuing the line of guide a, in combination with the side leaves, D D, slidingin guides b, c, and a, arranged and operating substantially as herein described.

3. The main piece A, having upper and lower ways or guides, c and a, and the hinged lower corners, B B, having ways or guides b, continuing the line of guides a, in combination with the side leaves, D D, slidingin guides b, c, and a, and the means fordirecting andlimiting their extension, consisting of the slots d d in said side leaves, and the pins 6 in the main piecc A, fitting through said slots, all arranged and operatingsubstanti ally as herein described.

- In witness whereof I hereunto set my hand.




Referenced by
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US3282230 *Oct 11, 1965Nov 1, 1966Levy Carol LPortable surface
US3338627 *May 13, 1966Aug 29, 1967Memorial HospitalWheelchair apparatus
US4819568 *Dec 14, 1987Apr 11, 1989Coffrin John CMulti-way portable writing desk
US4852498 *Mar 20, 1989Aug 1, 1989Curtis Manufacturing Company, Inc.Lap top computer work station
US5553824 *Aug 1, 1994Sep 10, 1996Dutra, Jr.; Joseph G.Adjustable length laptop computer tray assembly
US5971148 *Jan 26, 1998Oct 26, 1999Jackson; W. ShaunLuggage for nomadic computing
US6131522 *Oct 29, 1998Oct 17, 2000Hewlett-Packard CompanyUniversal space saving flatbed scanner stand
US6662733 *Oct 18, 2001Dec 16, 2003Martin Carl ScottMulti-leaf organizer
US7322300 *Nov 8, 2005Jan 29, 2008Jeremy Daniel CaetonSpace saving table
US20040045482 *Sep 4, 2003Mar 11, 2004Jonathan ChalmersMulti surface knee board
US20050188899 *Feb 28, 2004Sep 1, 2005Frederick YovichWork surface device
US20060118011 *Nov 8, 2005Jun 8, 2006Caeton Jeremy DSpace saving table
US20090265897 *Apr 16, 2009Oct 29, 2009Haynes Claude EMouse Support Tray for Computer
US20100032395 *Jul 17, 2009Feb 11, 2010Andrea ZabinskiFoldable tray attachment and package for chair
US20100295431 *Jun 8, 2007Nov 25, 2010Yuan SuWriting desk of drawer connecting with the arms support board
Cooperative ClassificationA47B23/002