US1985212A - Draftsman's table - Google Patents

Description

Dec. 18, 1934. A QFARRELL -1,985,212

DRAFTSMAN 5 TABLE Filed Oct. 11, 1932 4 Sheets-Sheet 1 4* INVENTOR Dec. 18, 1934. e, A. OFARRELL 1,985,212

DRAFTSMANS TABLE Filed Oct. 11, 1932 -4 Sheets-Sheet 2 INVENTOR Dec. 18, 1934. G. A. OFARR ELL DRAFTSMAN'S TABLE Filed Oct. 11, 1932 4 Sheets-Sheet 5 2 ew In l 4 6 A m m M "Hump" I iNvE ToR .49. a. OM

G. A. OFARRELL DRAFTSMANS TABLE Dec. 1-8, 1934.

4 Sheets-Sheet 4 Filed 001;. 11, 1952 I INVENTOR 'v ifllhe zinvention relates; toga. table.

Patented Dec. 18, 1934 f a P feemlani 1 OFarrell; oakmonaim. Application pewter, 11, 1932,. Serial.. No.-,63 7,,2 62' construction designed. particularly for use, ,by draftsmem-but useful :in ::other r relations vemploying a straight edge maintainedaat-nightj angles to the side edges of the table. The invention has for its principal tlobjeets'itheiprovision of improved means for maintaining the straight edge employed at right angles to the side edges of the board in its various positions of adjustment, and the provision of improved means for adjusting the angle of the straight edge. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein:-

Figure 1 is a side elevation of one form of table construction. Figs. 2, 3 and 4 are partial plan, front and rear elevation views respectively of the table. Figs. 5, 6, 7 and 8 are detail views of the means for gripping the upper and lower edges of the sheet of drawing paper. Fig. 9 is a side elevation of a modification. And Figs. 10, 11 and 12 are detail views of a modified straight edge construction permitting the adjustment of the blade to various angular positions.

Referring to the drawings, 1 is one of two similar end members of the table frame shaped as indicated in Fig. 1 and consisting of metal strips, such end members being secured together by means of the angle irons 2, 2 and the foot board 3, and supported upon the angle brackets 4, 4. The structure is preferably bolted together throughout to permit it to be knocked down and shipped in compact form.

The board 5, which is of wood, is provided at one side with brackets 6 pivoted at 7 to brackets 8 carried by the frame. At its opposite side, it is provided with brackets 9 carrying the pivoted links 10 which support the board at various positions of adjustment, pins 11 carried by brackets 12 and engaging the holes 13, serving to provide the necessary adjustment.

The straight edge device comprises a U-shape bar 14, on which is pivoted the straight edge blade or plate 15, which also has a limited endwise movement on the bar. The ends of the bar lie at the sides of the table, and are pivoted at 16 to links 17, which in turn are pivoted to the rod 90. extending through the brackets 9. This arrangement permits the plate 15 to slide freely along the surface of the board and maintains it in all of its various positions at right angles to the center line of the board.

The drawing paper 18, or other fabric, is-

clamped at its upper edge between curved plates 19 and 20, the upper plate being secured in position. byithecclamm'ng? bo1tsa21. The. platesyare heldzuto the: boardiby boltsi22. ,sAmIuraJityoQf holes23 are, provided tat {the-edge. of ether board for :-;receiving these {lbOltS v22-, 5 so that x-the Zapper edge-:ofethe ,.-paper- -may;-;be .qadjusted ytolauitathe; onvenieneegofithcidraft manz ,-.:Withiwide,tab1es and large drawings, this permits the draftsman to adjust the position of the edge of the paper down, so that it is not necessary for him to lie across the board. The lower edge of the paper 18 is clamped between the curved plates 24 and 25 by means of the bolts 26, and the pulled yieldingly downward to hold the paper fiat on the board by means of the flexible strips 27 passing over the pulleys 28 and 29 and provided with the counterweights 30. A curved guard 31 carried by brackets 32, shields the strips 27 and the paper (when it lies over the pulley 28) from contact with the body of the draftsman. This arrangement permits of the use of a wide sheet of drawing paper, and its adjustment away from the upper edge of the table so that the lower edge lies, to the right of the pulley 28 (Fig. 1) and partly beneath the table.

Fig. 9 illustrates a modification, in which a different means is employed for engaging the lower edge of the sheet of drawing paper, or fabric, 18 and holding it tight on the board. The device here employed comprises a pair of lips 33, 34 between which the edge of the sheet is gripped, bolts 35 serving to draw them together. This lip 33 is pivoted to arms 36, which are pivoted to a bracket 37 on the lower side of the board 38. The weight of the lips'and the arms, which may be additionally weighted to suit requirements, serves to hold the paper tighten the board at various positions of adjustment, the dotted line position a showing the parts when a substantialjportion of the sheet 18 has been adjusted to a positionjbelow the table. r

In the modification of Figs. 10 to 12, provision is made for adjusting the straight edge plate 39 to different angular positions, one of which is shown in dotted lines b. The plate or blade 39 has a stop plate 40 secured to it, andis pivoted at 41 upon a bracket 42 which is slidable on the rod 14. The bracket 42 carries a slotted quadrant 43, and swinging arms 44 and 45 also pivoted at 41, which arms maybe fixed in any desired position by means of the thumb screws 46. The

arms each carry a stop pin 47, which moves in the slot in the quadrant and projects to a point below the-lower face thereof, such pin serving as a stop for engaging the edge of the plate 40,- and holds the plate and the blade 39 in position. When plates are the arms 44 and 45 are in the positions shown, the blade is held by the stop pins in the full line position shown. If it is desired to position the blade 39 in the dotted line position, the arm 44 is swung to the right till the stop pin occupies the position marked and clamped there by its thumb screw, so that the plate 40 engages it in such position, and the plate 39 occupies the dotted line position b.

What I claimiszq v v 1. In combination with a --tab1e, 'a U-shaped member having its middle portion lying over the top of the table and its ends at the sides thereon} pivoted to the ends.

links at the sides of the table of said member and to the table, and 'a' straight edge pivoted on said middle portion. of-the arm' in parallelism therewith.

2. In combination w1th"a table, a i l-shaped member having its middle portion lying .over the j top of the table and its ends extending downward along the sides thereof, a link at each side of the table pivoted at its upper end just below the top of the table and at its other end to one of the ends o'tsaid member, and a straight edge adapted to lie on top of the table and pivoted on said middle portion" of the member in parallelism with the middle portion of said member and resting flat on the top of the table.

3. In combination with a table, a bar mounted for movement over the table in parallelism with the edge thereof, a bracket mounted on the bar for sliding and pivotal movement thereon, a pair of arms pivoted on the bracket and provided with stop means, means for clamping the arms to the bracket in any desired position of adjustment, and astraig'ht edge pivoted on the'bracket and provided with means for engaging said stop means.

.4. In combination with a table, a for movement over the table in parallelism bar mounted with the edge thereof, a bracket mounted on the bar .for sliding and pivotal movement thereon, said bracket being provided with a slotted quadrant, a pair of arms pivoted on the bracket and provided with, stop pins projecting through the slot in the quadrant, clamping means for securing the a rms'in-any desired position of adjustment, and a a straight edge pivoted on the bracket and provided with means for engaging said stop pins and thus fixing the position of the straight edge.

G. A. OFARRELL.

Images