US297219A

US297219A - Lap-board

Info

Publication number: US297219A
Authority: US
Publication date: 1884-04-22
Anticipated expiration: 1901-04-22

Description

(No Model.)

A. L. ANTHONY LAP BOARD.

PatentedApr. 2-2, 1884.

UNITED STATES PATENT OFFICE.

ADAM L. ANTHONY, OF PLAGERVILLE, CALIFORNIA.

LAP-BOARD.

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.

ADAM. L. ANTHONY.

Witnesses:

FLORENCE E. ANTHONY, JOHN H. ANTHONY.