US2797491A

US2797491A - Square attachment for providing a scriber or a height gauge

Info

Publication number: US2797491A
Application number: US474384A
Authority: US
Inventors: Asperger Paul
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-12-10
Filing date: 1954-12-10
Publication date: 1957-07-02
Anticipated expiration: 1974-07-02

Description

July 2, I957 P. ASPERGER A 2,797,491

SQUARE ATTACHMENT FOR PROVIDING A SCRIBER OR A HEIGHT GAUGE Filed 03. 10. 1254 IN VEN TOR. Paul flspe rger A T TORNE Y United States Patent C) SQUARE; ATTACHMENT 'FDR- PROVIDING: A: SCRIBERZ OR: A,.HEIGH'.I, "GAUGE 1 The present invention relates to layout tools .used for markingmeasurements upon workpieces and aims to provide, a, novel and improved, device q n the forrn ;o an attachment to asquare wherebya combinationscribenand i h ga s pr ed- An object of the. invention is; to provide, a .rnarker, at-

tachment to asquare whereima,marker-1 blade, is adjust.-

ably clamped to the blade of a squarefor marking. aworkpiece while being held in v.properaposition relative-[to said workpiece -by engagement of .the head of, that square with a surfacepn or directly related to saidworkpiece,

Anotherobjectlof the. invention is to provide, in 3 211001 of, the character.v set forth, a novelt supporting; andadjusting. means for a marker on and relative to .a, squarewherer by th e scale on the blade of the square is usedtodetemline the position of the marker.

A further object of the invention is to provide,'in a tool of the ,character s et forth, a novel clamping structure for rigidlyholding a marker inadju sted position on a block which in turn is clamped 'to the blade of a square.

It is-also an object-of the-invention -to provide a device of the abovefindicated character, whichissimpleand substantial in construction, inexpensiveito manufacture, and yet. highly efiicientand practical in use.

These, together. withother auxiliary features andobjects ofther-invention which willllateribecome apparent-as the following description proceeds, are attained by the present invention, a preferred embodiment of which has been illustrated, by way of example only, in the accompanying drawings, wherein:

Figure 1 is a side elevation showing the attachment on a square and used as a height gauge;

Figure 2 is a similar view showing the attachment and a square used as a scriber;

Figure 3 is a transverse section taken on line 3-3 of Figure 1;

Figure 4 is a similar sectional view taken on line 4-4 of Figure 1 and looking upwardly; and

Figure 5 is a vertical setion taken on line 5-5 of Figure 1.

Referring more specifically to the accompanying drawing wherein like numerals designate similar parts throughout the various views, the numeral 10 indicates the workpiece; 11, a surface plate upon which the workpiece 10 rests; and 12, a machinists square having a head 13 and scaled blade 14, the blade 14 also being provided with t ,a longitudinal groove 15 and the head with a clamping means 16 by which the head is adjustable on and removable from the blade. Because the constructions of such parts of a machinists square are well-known in the art, further detailed illustration and description thereof have been omitted.

The improved attachment to the square 12, which is designated generally by the numeral 17, consists mainly of a rectangular block or head 18 slotted, as at 19 and 20, on sides thereof at right angles to one another for receiving and having clamped therein portions of the blade 14 of the square 12 and a marker blade 21, re-

Patented. July I 2, 1957 speetively; The slots 19 and.. 2 0 are, of dep hs and h- .substant a lyi qual to. he dt s d' h kne ses of; the.. qi1 .e. b ade 1 an a k r. b e ,;re pe tive: y d. t, o ngth t end. nti e y ss the block 18 for permitting longitudinal slidableladjustment of,saidsq areb1ade nd said. ark riblad n .said sl ts and relative to said block. The marker blade-.21. has i s: pposi e ide edges p r ll to. o e, ano r. a d. i f onsiderably g e ter e gth then he block 18 hrough .which.,.i ex ends-.- Themar r b a 1 has t orward marking. ndt e e ed, at wr gl provide a shar edge22 which is on -the.sameplane-astthat of the surface 23 .of the ,bloek thatis slotted ,to receive. said bladsafihus ei her ne i eedgeo t m k r 7. ade or. t e/s rface 123 at the slot may be registered, withthescale on the square blade, in determining the .position of the, edge 22 of the marker fromthe head 13. of-the squares,

A clan ping, element 24 bolted, as atv 25,.t0 the block 18, at the surface v23,. thereof. engageszone side, edge; .of the marker blade 21 andforWsthe otherside. edgetof said marker, bladgin, contact engagement. with the, bottom surface of the slot 20 throughout thelengthof, said slot for holding saidwblade ,squared, with .said block. t A notch 26 inwardly of. the surface 23. and, extending: entirely across lthe,block ,18: relieves the block from contacting the-end portionsof the ,clampingelement24,.that engages the, mar ker.blade,21, thus assuring the. application: of pressure by said clamping elementonsaid marker. blade. The 0 ,h6r, end portions, of said clamping element, and notchareprovided with contacting surface s.27 and 28,

, esnec veb'; hat es ht y d-by r l y c eas:

ing the thick ess ofthe clampingielemen t and the depth of the notch as both extend outwardly. Between the-location oftheangled,contactingsurfaces .27. and 28 and the locationof engagement of .the clamping element with the side edge ofthe markerblade, the-bolt. 25: is arranged and extends; through an-opening 29 in theclamping ele: ment.beforebeingfthreaded into anopening. 30 in-. the block 18, t A knurled. head 31 on the bolt ZSengages the outer, surface of. the clamping element, for applying pressure to said clamping element and against both the marker blade 21 and the

angled contacting surfaces

27 and 28. The

angled surfaces

27 and 28 maintain the clamping element 24 squared with the block 18 and blade 21 both during and after clamping operation, thus efiecting an eflicient clamping action. Also by slightly receiving one end portion of the clamping element 24 between opposite side walls of the notch 26, the clamping element is held against turning during clamping operation.

Another clamping element 32 of similar construction to the clamping means 16 that adjustably attaches the blade 14 to the head 13 of the square 12 is provided for adjustable attachment of the block 18 to the blade 14 of the square, which consists of a draw bolt 33 slidable in an opening 34 in the block and at right angles to the slot 19 and which engulfs the portion of said slot through which it extends. The draw bolt 33 has a knurled nut 35 threaded on one end which bears against a side of the block 18 and has the other end portion reduced in thickness and provided with a small lateral tongue 36 for extending to one side of the square blade 14 and engaging the tongue into the longitudinal groove 15 in said blade. Upon rotation of the nut 35 in a direction tending to withdraw the draw bar 33, the tongue 36 engaging in groove 15 will pull one side edge of the square blade 14 in tight engagement with the bottom surface of the slot 19, thus securely clamping the block in adjusted position on the blade 14. Reversing the direction of turning of the nut 35 will relieve the clamping action and permit sliding of the block 18 to other adjusted positions 3 or removal of the improved attachment 17 from the square.

It is clearly apparent that by precision grinding the

slots

19 and 20 in the block 18 to size throughout their lengths and at right angles to one another, the

blades

14 and 21, when clamped against the bottom surfaces of said slots will be maintained at ninety degrees relative to one another independent of adjustments of said blades with respect to the block and to one another.

In Figure 1, the improved attachment is shown clamped to the blade of a square in a manner for use as a height gauge whereby a measurement is made upon the workpiece 10 the proper distance above the face of a surface plate 11 upon which both the workpiece and head of the square rest. Figure 2 shows adiiferent arrangement of the head 13 of the square relative to the improved attachment for use of the tool as a scriber. In this case, the head of the square is slid along a surface of the workpiece 10 while the sharp marking edge 22 of the attachment marks a line on another surface of the work. When used for either of these purposes, it will be noted that the marker blade 21 is longitudinally adjustable to considerable distances with respect to the block 18 which permits efiicient use of the tool in laying out workwith irregular sides or with cavities therein on which markings are to be made.

In view of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the construction, operation, and advantages of the device will be quite apparent to those skilled in the art. A more detailed description is accordingly deemed unnecessary.

While I have herein described a specific form which the invention may take, it will be understood that changes and modifications may be made which still fall within the spirit and scope of the appended claim.

What is claimed is:

An attachment for a square having a blade with graduations thereon and a head with clamping means by which said blade is adjustable according to said graduations to different positions on said head, said attachment comprising a substantially rectangular block having a pair of narrow and relatively deep grooves therein extending inwardly from different right-angled sides thereof and entirely thereacross and having narrow bottom surfaces at right angles to one another, said grooves being slightly offset transversely to each other and being open to one another where they cross, one of said grooves being of a width substantially equal to the thickness of the blade of the square and being adapted to receive a portion of said blade with one of its side edges in engagement with the narrow bottom surface at the depth of said groove, clamping means on said block and engaging said blade so as to frictionally hold said side edge of said blade against the bottom surface of said groove, 21 marker blade of a thickness substantially equal to the width of the other of said grooves and of a width substantially equal to the depth of said second-mentioned groove and adapted to be partially received in said second-mentioned groove with one of its side edges in engagement with the narrow bottom surface at the depth of said second-mentioned groove, said marker blade having one of its side surfaces in contacting position with a side surface of the blade of the square at the location where said blades cross and having its side edge opposite to that engaging the narrow bottom surface at the depth of said second-mentioned groove aligned with graduations on the blade of the square, and another clamping means on said block in engagement with the side edge of said marker blade opposite to that in engagement with the bottom surface of said second-mentioned slot so as to hold said marker blade squared with the blade of the square and in longitudinal adjusted position relative to said block, said marker blade having a sharp marking edge on one of its ends and on the same plane as that of the side edge of said marker engaged by said second-mentioned clamping means and aligned with said graduations.

References Cited in the tile of this patent UNITED STATES PATENTS 579,952 Campbell Apr. 6, 1897 1,179,142 Shaugnessy Apr. 11, 1916 1,380,744 Simmons June 7, 1921 1,404,425 Bartholdy Jan. 24, 1922 1,509,703 Bourgeois Sept. 23, 1924 2,345,424 Pfeifer Mar. 28, 1944