US2458188A - Drafting instrument - Google Patents

Description

Jan. 4, 1949. J, MORAN 2,458,188

DRAFTING INSTRUMENT Filed May l5,A 1946 Wm A 26 32 INVENToR. JOSEPH MORAN le BY TTORNEY Patented Jan. 4, 1949 uul'rlen eat,

reassess 'DRAFTING msifnuMENfr JosepliiMoramJkcagoflll. ApplieaumMay-is, 1946, srialinnfissasos fz (or. sexta) i i The present invention relates .to draftingin- .therethzfu'gmhmichfis'rovided-:atone extremity struments, and more particularly to improve- 'wlhvaa'tlla'mpng 'iscTS. ments therein. v'In' 'usefthemember II "is ,se cured'toal'sitable It is often necessaryrin drafting to draw 'lines fdraftiiig ltablfe" `y, ,pbitionin''g "'th'e base i I3 over or do lettering at various angles or atvarious' 5 ftneftop"thereofuntil thexzblock 11i 'Seng''aefesthe positions on the sheet on which the work "is being e'dgetherofaridthen tighterngthebolt f8"the done. The usual method 'for such :operations `disc:'I9*engagingthe nrrdersidebfthetabl'e. `It is to utilize a T-square and triangles,'whichper is obvious that the device"ma y r'be clamped 'to form suitably under many conditions. "However, different tableslofdifferent "tlrieknesses' and iat such implements are not 'satisfactory for opera-M10 any V4s`u'itaril'e"position'onifihetalla tions at varied angles, or where itisdesirableto .A, straight-edge. 2l is securedi'torthameni-ber clamp the instruments '1in a 'certain'rposition'lor LIl bysecuring means.inicatedgenerallyas .22. repeated operations. The" sepurmgtmean'sin 'dnclueafplate '123 "which Accordingly, an object "of 4the 'presen-t invenis "secured by screws to 'a'ifbloc'k' 2:6 "located any angle or at any position "on "the sheetion '2'3eissufolently'Wideto'eitend*across-thezslot'iIZ which work is .being done. andoverthe-"meniber ITI thus preeluding'the A second obj ect of the invention is to provide "block 2liandplate2'3"ffromipassingidownwardly suitable clamping means for insuring repeated throughrthesldtl.

operation at the same angle or position. zo platelTLs'nnilar A.insnreto the' plate 23, 'is

rThe -device embodyingiiilfieinventionfcomprises, positioned under themember "-11 iand `in alignin general, a member for secull'enentto aldraftment with .the plate' 23. ""Thetwo plates lare ing table, a straight-edge, means -for securing fsecured*together-bythe screws 24.

the straight-edge to the member in such a man- Abrolt'thavingffaflargeilcrrurledih'eadpasses ner as to allow it to be secured at any 'position 25 through an l[opening .iinithe top 'fpla'te U23, is

straight-edge which rmay be secured torth'ehst fthrough--fan vinnen-lngiin plate-i231. VAThe straight-edge'perpendicularlyuthereto, when detbolft 728ist'prot/"ided wit'hfa tappeddentralppening sired. in the bottom thereof, the threads" 'lng opposite Ajbe'tter understandingcio'ffthe devicemaybem .to those -onthe bolt.A that is,-i"f the boltisffprohad bythe following-detailed"descriptionthereoi *slided"withri-gliti-lianilthreafds'- those-'effthe openwhen read in conjunction with the accompanying ing are of the left-hand variety. drawing, in which The tapped opening in the bolt 28 receives a Figure l is a perspective View of an apparatus set screw 29 which is threaded through the embodied in the invention; 35 straight-edge 2l, the under side of the straight- Figure 2 is an enlarged sectional view taken on edge lbeing-counterbored to receive the head the line 2-2 of Figure 1; of the set screw.

Figure 3 is an enlarged sectional view taken on FY-Om the above deSOIiDtOn it may be Seen that the line 3 3 of Figure l; and inasmuch as the set screw 29 secures the straight F' ure4 is an enlar ed sectional View taken on 40 edge 2| t0 the bolt 23- and as the bolt 28 is thelfne 4 4 of Fgur 1 threaded through the block 2s, the plate 21 wm Referring now to Figure 1, it may be geen that be held between the straight-edge 2I and the a two barred longitudinal member I I is provided, block 26' Y r in th bolt 28, and which has a central longitudinal slot I2 extend- 45 beugcunggus(hwbo nis of an opp0 ing almost the enme length thereof' At one site thread, such will not result in loosening of extremity of the member Il a short flat base lI3 the screw 29 the Straight edge 2| becoming is Secured by means of screws M or other 5mt loosened with respect to the remainder of the able meansassembly, thereby allowing it to be positioned at By reference to Figure 4 it may be seen that 50 any angle with respect 1-,0 the plate 21 and thus two of the screws I4 are Short, passing through with respect to the member Il. Thereafter the the member II and the base I3 only, whereas the bolt 28 w11 be tightened` with the straight edge other tWO SCI'BWS IMSS through 9 block l5 and 2| beine,r held by the described assembly in such thread into another flat base I'l. The base I1 is angular position. provided with a large-headed bolt I8 threaded 55 A second top plate 3l is provided, adjacent the each other. edge 33 is not in use' the bolt 31 .may be removed 3 plate 23, which is also of su'lcent width to extend over the slot I2 and member Il. The plate 3| is provided with an opening through which extends a large headed bolt 32 which is threaded into the block 26. By tightening `the bolt 32 the plate 3| will be clamped against the member and preclude movement of the block 26 in the slot I2. However, by loosening the bolt 32 the entire assembly may be moved Within the slot |2 to anyposition with respect .to the member| l, at whichtimeJthe bolt 32 will be tightened again.

Therefore, from the above description it may antenas be seen that the straight-edge 2| may be secured f at any angle with respect to the member and may then be moved to any positionk alongthe ber having a longitudinally extending central slot, means secured to said member for securing said member to a drafting table, a straight-edge, a block positioned in the slot in said member, an upper plate secured to said block and extending over the slot and said member, a bolt passing through said upper plate and threadably engaging said block, said bolt being provided with a tapped central opening, a screw threadably ensaid bolt, and va lower plate positioned between gaging said straight-edge. and the opening in said block and said straight-edge, whereby the 'recited elements operate to permit said straightedge torbe positioned at any angle with respect length of the member Il and be secured in that position all while retaining the previously set angular relationship with thefmember I I.

With reference to Figure 1 again, it may be seen that a second straight-edge 33 is optionally provided. The straight edge 33 has a plate 34,

bifurcated et 3s, extending 'sidewar'diy therefrom approximately midwayof its length. The

I plate 34 `is secured. to the straight-edge '33 by any suitable means, such asv the illustrated screw.

Referring now to Figure 3, it may bevseen that a knurled headed bolt 31 .passes through the bifurcated portion 36 vof the plate 33 and threads into. the straight-edge 2|, the plate 34 and shoulder portion. of the bolt 31 being separated by awasher 38. y

When it is desired to use the straight-edge 33 the bolt 31`may beloosened, if in the straightedge 2|,. the bifurcated portion 36 of the plate 34positioned encompassing the bolt 31 under the,

washer 38, and the bolt 31 tightened. By placing. the straight-edge 33 in engagement with the extremityof the straight-edge 2| it will insure the members being perpendicular with respect to It is obvious that when the straighthas beenrdescribed it is-illustrative only, merely being an embodiment within the scopeand spirit Vof lthe invention.

what is eieimed isz' 1. A drafting instrument comprising a memto said member.

2..A drafting instrument comprising a member having a longitudinally extending central slot, means securedto said member for securing said member to a drafting table, a straight-edge,

a block positioned in the slot insaid member, anupper .plate secured to said block and extending over the slot and said member, a bolt passing through said upper plate and threadablywengaging said block, said bolt being provided with a tapped central opening, a screw threadably engaging said straight-edge and the opening in said bolt, and alower plate positioned between said block and said straight-edge, whereby the Arecited elements operate to permit said straightedge to be positioned vas an angle with respect to said member, a second upper plate extending over the slot and said member, and a bolt passing through said second upper plate and threadably engaging said block, whereby said second ,upper plate and said bolt operate to permit said straight-edge to be positioned at any point in theslot in said member.

l JOSEPH MORAN.

REFERENCES CITED .-The following references are of record in the vle'of this patent:A

UNITED STATES PATENTS vNumber Y Name Date 530,741 Altpeter Dec. 11, 1894 1,346,409 Lucas July 13, 1920 FOREIGN PATENTS y Number I -Country Date Great Britain Oct. 28, 1922

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