US1756289A - Drafting board - Google Patents

Description

A ril 29, 1930. M. M. HARblNG DRAFTING BOARD Filed Jan. 23, 19 29 2 Sheqts-Sheei 1 April 29, 1930. M. M. HARDI G DRAFT'ING BOARD Filed Jan. 23, 1929 2 Sheets-Sheet 2 Patented Apr. 193% ,nezsa QMILO M. HARDING, or nos niiennns, CALIFORNIA nnnrrrne norm]:

7 Application filed January 23,1929; Serial No. 334,469.

, This invention relates to drafting boards, and has more particular reference to devices of this kind adapted for use in making either sheet metal reflector secured to the underside of said board member beneath the glass panel and adaptedto form abase to effectively sup port the board member on top of a desk or table at a desired inclination, and a source of light mounted in said reflector to illumi of the board member so thatv a tracing may be easily made. 1 p Y Other objects will become more apparent as the nature of the invention is better understood, and the same consists of the novel form, combination and arrangement of parts hereinaftermore fully described, shown in 1 the accompanying drawings, and claimed.

In the drawings:

Figure 1 is a top plan view of adrafting board embodying the present invention.

Figure 2 isa transverse verticalsection on line 2-2 of Figure 1. I f

Figure'3 is a longitudinal vertical section on line 3 3 of Figure 1.

. Figure 4 is a bottom plan'view of the de-. Y vice shown in Figure 1; and N I Figure 5 is an enlarged fragmentary section showing the manner of attaching the lamp supporting bracket to the reflector.

Referring more in detail to the drawings. the present drafting board embodies a rectangular board member composed of spaced relatively narrow top and bottom strips '45 and 6, spaced relatively wide side strips 7 nate the paper secured overthe. glass panel and 8 fltted between theopposite ends of the-" I top and bottom strips 5 and 6; and longitudinal end strips 9 and 10 extending acrossand secured to the outer edges'of the side strips 7, and 8 and the end-edges of the top and bot tom strips 5'and 6 so as to rigidly secure said strips 5, 6, v7 and 8 together, and prevent buckling of the board and breaking of the glass panel,; to. be referred to later. This forms a board member which is transversely elongated and has a central relatively large rectangular opening elongated longitudinally or from top to bottom of the board member. Theupper'edge portions of the strips 5, 6, i Tand 8 aboutthisopening are rabbeted as and is set with its upper surface fiushwith theupper' surface of the board member, the

panel 12 beingp'referably set at its edges in cement-to firmly hold it in place. The wide yside strips 7 and 8 adapt the board member for efficient use in general drawing work with paper sheets of various sizes which may 7 be readily fastened in place by thumb tacks.

In this respect, the-present device essentially 1 V diflers from mere'tracing boards having a uniformly narrow frame .in which is set a glass panel forming substantially the entire paper-supporting surface.

. r F astened to the underside of the board at an inclination, as clearly shown in Figure 3. The inner surface of the base 13 may be painted white to provide a reflecting surface. and the ends of the same are preferably 5 flanged as at 1 to receive screws or the like i to fasten such base or reflector to the board member, as shown clearly in the several I views. 7 Soft strips 15 may be secured on the bottom of the reflector or'base 13 to prevent at 11 to receive the margin of afrosted glass 7 plate or panel'12 which closes such opening marring of the finish of the desk or table top.

The rear end of the reflector 13 has a central opening in which is fitted the shank of a tubular bushing 16 having a head 17 on its outer end and a nut 18 threaded on its inner end. A curved strip of stiff sheet metal is provided to form a supporting bracket 19 having a lamp socket 20 secured on one end and formed with an opening atthe other end to fit over the shank of the bushing 16, be-

' tween thenut 18 and the rear wall of the refiector'. The nut-'18 is tightened to firmly secure the bushing 16 in place and to also firmly mount the bracket 19 in the deeper rear MILO M. HARDING.

end of the reflector. It is thus'apparent that an incandescent electric lamp 21 may be placed in the socket 20 and thereby supported in position to efi'ectively illuminate the portion of a paper sheet lying over the glass panel 12. An attachment cord 22 extends through the bushing 16 into the reflector, the inner ends of the conductor wires of said cord being connected to'the terminals of the 7 socket 20, and the outer endsof such wires being c'on'nected to the terminals of an attachment plug 22 so that current for the lamp 21 may be taken from a wall or lamp socket of a house wiring system.

i ,To employ the present drafting board in making tracings from sheets of paper or the like, the sheet having'the subject to be traced isplaced on the board member and over the glass panel, and then a sheet of blank paper or linen is laid over the first sheet toreceive the tracing. The sheets are then fastened in place by thumb tacks and the lamp 20 is 1i ghted to illuminate the paper and render the subject to be traced readily discernable so that a copy of the latter may be easily taken.

Obviously, the present invention maybe used for forms of copying, tracing, art and drawing work.

Minorchanges are contemplated within 7 the scope of the invention as claimed.

What I claim as new isi V g V 1. A drafting board comprising a board member having a central opening a glass panel set insaid opening, a hollow open-top reflector secured to the underside of said board member beneath said panel and gradually increasing in depth from front to rear of the board member to form a base adapted to support said board member at an inclination on a desk or table top the rear of the refiector being curved inwardly for assuring maximum reflection, and a lamp socket mounted in the deeper rear end of said reflector. v

2. A drafting board comprising a board member having a central opening, a glass.

panel set in said opening, a hollow open-top reflector havingvan inwardly curved portion atthe rear secured to the underside or said board member beneath said panel and gradually increasing in depth from front to rear

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