US2194889A - Drafting means - Google Patents

Description

March 2.6, 1940.` H, L DE |s| E 2,194,889

DRAFTING MEANS Filed Jan. 2l, 1938 3 Sheets-Sheet 1 57 Q j 25 d /L///// '25 t fi C j 53 ////y/l gx i 5J 75 @1 5? l V \U- f f i? March 26, 1940. H. l.. DE LlsLE DRAFTING MEANS 3 Sheets-Sheet 2 finanzian- Filed Jan. 2l, 1958 March 26, 1940. H, L DE L lsLE 2,194,889

DRAFTING MEANS Y Filed Jan. 2l, 1938 3 Sheets-Sheet 3 f 1 u T f PatentedfMar. 26, 1940 UNITED STATES PATENT OFFICE 4 Claims.

This invention relates to drafting means of the class employed by mechanical draftsmen, engineers and the like.

An important object of the invention is the provision of a drawing board desirably of wood, combined with metallic means for mounting a parallel rule of the cord controlled type.

Another object of the invention is the provision of a support such as a desk or table for the y drawing board, and means in association with these parts for readily reversing the direction of mounting of the board on the support so that the desk can be used by one person while the drafting board may be used simultaneously by another, and at the same time providing a maximum of efficiency and rigidity.

Other objects and advantages will be apparent from the following description, taken together with the accompanying drawings, in which- Figure 1 is a side elevational view of my improved drafting means;

Figure 2 is a front elevational view of the structure of Fig. 1, being broken away to conserve space;

Figure 3 is a reduced side elevational view of the complete desk and drafting board in one alternative position;

Figure 4 is a similar view in another alternative position;

Figure 5 is an enlarged fragmentary vertical sectional view taken on the line 5-5 of Fig. 1;

Figure 6 is a similar view taken on the line 6--6 of Fig. 1;

Figure l is a fragmentary side elevational view, partly in cross-section, taken on the line l-l of Fig. 6;

Figure 8 is a view similar to Figs. 5 and 6, but taken on the line 8-8 of Fig. 1;

Figure 9 is a view similar to Fig. 7 but taken on the line 9-9 of Fig. 8;

Figure 10 is a plan view, broken away to conserve space, and partially in section, of the drawing board and parallel rule device;

Figure 1l is a section taken on the line ll-Il of Fig. 10; y

Figure 12 is a side elevational. view of the structure of Fig. 10; and

Figure 13 is an enlarged sectional view taken on the line |3-I3 of Fig. 10. 1

Referring in detail to the illustrative construction shown in the drawings, the support 20 may be a table or advantageously a desk having drawers such as 2| in one face, together with a knee opening 22 in this same face, and upon 55 which is mounted a drafting board 23.

In accordance with the present invention the drafting board is rigidly secured at each side to a somewhat truncated triangular bracket 24, one of the longer sides 25 of the bracket being inwardly anged and permanently secured to the 5 board as by screws 26; one of the shorter sides 21 of the bracket extending from the board adjacent its rear edge; and another still shorter side 28 of the bracket extending from the board adjacent its front edge. of each bracket is an aperture 29 through which passes a pivot screw 30, threadedly received in an extension member 3| telescopically slidable in a channel member 32, one of ywhich is secured along each upper side of the desk as by screws 33 ,15 permanently secured. Tightening of the pivot screw 30 clamps the members 3| and 32 lagainst relative movement, but by reason of the shoulder 34 on the bolt 30, prevents clamping of the bracket 24 to the desk and permits this bracket 30 to be swung in a plane parallel to the sides of the desk, that is, to cause the drawing board 23 to be moved toward or away from the desk top 35.

At its rear 2l each bracket has a slightly arcuate closed slot 36, through which passes a clamping bolt 31 received at its rear end in the extension member 3|, and secured therein against outward movement by nut 38, the extension member being also desirably hollow or channel-shape in cross-section for this purpose. A cap nut 39 80 having a hand wheel 40 thereon is received on the clamping bolt 31 and may be tightened or loosened to clamp the bracket 24 to the desk against movement of the bracket on its pivots 30, or, to permit movement of the drawing board on these pivots aliV within the limits of the slot 36, as desired.

The screw bolt 4| is also shown for cooperating with the pivot screw 30 to normally prevent sliding of the extension member 3| in the channel 32. However, by loosening the members 30 and 40 4| the extension member 3| may be moved horizontally in the channel 32, to vary the position of the pivot 30 with reference to the desk. Not only may the pivot 30 be moved toward or away from the person sitting at the face of the 45 desk from which the drawers 2| open, as shown in Fig. 3, but the position of the board with respect to the desk may even be reversed as shown in Fig. 4, so that the board faces toward a person who may be working at another desk to the right 50 of the desk shown in Fig. 4, and who may occupy a swivel seat such as 42 so that person may turn and use the board as it is mounted in Fig. 4. At this time another person may be using the top 35 of the desk 20. u

At the front lower corner 10.

When mounting the board as shown in Fig. 4 in reversed position, it will be understood that the extension members 3i are slid into the channels 32, through their rear open ends after the extension members have been slid rearwardly outwardly therefrom and the board reversed, and then when the proper adjustment has been made to project the board over the rearV edge of the desk, the screw bolt 4I is tightened to prevent relative sliding movement oi.' the extension 3i in the channel 32. Since the extension membei' 3i and the board are shifted as a unit, the relation of the pivot 38 and clamping bolt 31 with respect to the extension member and the bracket 24 need not be disturbed, while in any position the board is free to be adjusted angularly toward or from the desk on its pivot 38 by movement of the clamping bolt 31 in the slot 35. In order to guide the extension member 3l in the channel 32, the extension member desirably has bosses 43 and 44 for screw bolts 30 and 4i respectively, which are snugly received in the longitudinally extending slot 45 in the channel member 32. Also a bushing 46 for the clamping bolt 31, advantageously made of f.bre or a like material may be similarly somewhat snugly received in this slot 45. The bushing 46 is preferably elongated longitudinally `of the slot 45 to enhance the bearing area across the slot 36. I will now describe my improved parallel rule device. To each side of the wood board 23 and outside of the brackets 24 is secured a box-like channel member 48. 'I'his channel member 48 is desirably sunk into the top surface of the .board' 23 so as to be flush therewith, flanges 49 on the channel members piercing the board top and thereby attaching the channel members 48 securely to the board. Adjacent the front of the board theside walls 58 of the channel members are abutted against the side edge of the board 23,

but extend below this side edge to carry the shelflike lower wall of the channel member 48 spaced from the lower under face of the board.

At their forward ends the channel members 48 .carry in their side walls 50 a horizontally axled 5` bolt 52 upon which is journaled a pulley wheel 53, the board being recessed as at 54 to receive the nut on the inner end of the axle bolt 52. Adjacent to the rear end, each of the channel mem- .bers 48 carries a vertically axled bolt 55 upon w'which is journaled a pair of vertically spaced apart horizontally disposed pulley wheels 56 and 51. The under face of the board is recessed as at 58 to receive the pulley wheels 56 and 51 and .the channels themselves are cut away in their 55side lfaces 50 as at 59 to permit the peripheries of the pulley wheels 56 and 51 to project therethrough. The pulley wheels 56 and 51 are desirably spaced apart by a sleeve 68 and between lthe upper pulley wheels 51 and the upper wall of the channel is a fibre washer 6I into which an oil hole $2 gives access for lubrication. A metallic washer 63 may be disposed between the fibre washer 6I' and the hub of the pulley wheel 51.

" Communicating with the cut-out portions 58 of the 'under face ofthe board 24 is the transverse channel 64 in thls under face which extends across the board and through which the parallel cord 65 is trained. ,It is understood that this cord comprises a series of runs endlessly connested, and trained over the pulley wheel 53, then along one side oi' the board. then over say y the upper pulley wheel l1 at the right hand side of the board, down to the lower pulley wheel 56 at the left hand side of the board, then over one of the pulley wheels 53 at the left hand side o1' the board, then back along this side of the board to the upper pulley wheel 51 at the left hand side of the board. then across the board to the lower pulley wheel 55 at the right hand side of the board, and back to the pulley wheel 53 at the right hand side of the board.

It will be understood that a conventional parallel rule.66 which extends across the upper face of the board may be secured to the cord 65 by any attaching means such as the means 61 at each side of the board and when once clamped to the cord with its edges parallel to the front edge of the board will continue to move up and down on the face of the board in such perpetuated parallel relationship.

In order to permit of increasing the vertical distance between the upper and lower walls of the channel member 48 a filler bar 68 is advantageously secured along each under side of the board 23. Screws 69 may secure both the channel member 48 and the iiller bar 68 to the board.

Having described my invention, I claim:

1. In drafting means including a drafting board and support therefor, the combination of channel members mounted horizontally on the parallel lateral sides of said support adjacent its upper end, said channel members being open at at least one end, an extension member snugly received telescopically in each channel member for sliding movement therein from end to end of the channel member, a bracket xed to each side of the drawing board to jointly span the upper end of the support, each bracLet being pivotally connected to one of said extension members whereby the drawing board may be adjusted forwardly and rearwardly of said support by movement of said extension members in said chan` nels and said drawing board may also be adjusted angularly with respect to said support by movement on said pivots, and means for fixing said angular adjustment.

2. The structure of claim l wherein the means for` fixing said angular adjustment includes a slot in said bracket and clamping means passing through said slot to clamp the bracket to the extension against pivotal movement.

3. The structure of claim 1 wherein the means for fixing said angular adjustment includes a slot in said bracket and clamping means passing through said slot to clamp the bracket to the extension against pivotal movement, and wherein the extension is also of hollow channel-shape and said clamping means is received partially in said hollow extension.

4. The structure of claim 1 wherein both the channels and the extension members are of hollow box-like form slotted longitudinally on one of their faces, the unslotted face of the extension member being immediately adjacent the slotted face of the channel member and said connections between said extension member and said bracket extend through the slot in the channel member to the said adjoining face of the extension member.

HAROLD L. DE LISLE.

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