US1811167A - Stenciling device - Google Patents

Description

June 23, 1931. I H. ANDERSON ETAL 1,811,167

STENCILING DEVICE Filed Dec. 19. 1929 2 sheets sheet 1 N 0/, INVENTORS WWI. 620mm IMML 6 6 m (0W June 23, 1931.

H. ANDERSON ETAL 1,811,167

STENCILING DEVICE Filed Dec. 19, 192 2 Sheets-Sheet 2 q F.lg.LZ

40 2 4 4a. l I 5 15 device in cross-section, taken on the plane Patented June 23, 1931 UNITED STATES PATENT oFr-ics HERMAN ANDERSON AND RAYMOND J'. GANNON, OF PITTSBURGH, PENNSYLVANIA, 1 i ASSIGNORS T JAS'. H. MATTHEWS & GOMEANY, OF PITTSBURGH, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA s'rniroimne Davies 7 Application filed December 19, 1929. Serial No. 415, 148.

This invention relates to a stenciling device, consisting of the organization. of a paint-gun and a stencil in a frame, which device requires a minimum of supervision in the application of accurately painted patterns'or characters to surfaces to be marked;

The accompanying drawings illustrate a device embodying our inventlon;v Figure I is a v1ew of the dev ce in side elevation;

Figure II is a view in plan of the stencil,

showing interchangeable character-bearing plates mount-ed therein; Figure III is a view in cross-section, taken. on the plane III-III of Figure II; Figure-XIV is a View of the IVf-IV of Figure FigureV isan enlarged view of the base of the device in cross-section, showing the removable stencil positioned therein; Figure V1 is a further enlarged 2b v1ew showlng in cross-section a. characterbearingplate position inrthe stencil; Figure VII is a fragmentary view of the paintgun supporting standard, showing instrumentalities associate'dtherewith to regulate Figure VIII is a view in side elevation of a tally which may conveniently be associated with the stenciling device for recording in summation the number of applications of an patterns or characters which'have been made.

Referring to the drawings the device consistsof a stencil carrying base'to which an adjustable standard jl'is attached. Thebase includes a win'dowed fioor 4 (the numeral-4O t designates 'the window in the floor) which terminates peripherally in a wall or flange 4a, conveniently having a" stud, 2 integral therewith for theattachment of the standard 1 to the base 'A set-screw 12 serves to secure 1 the standard 1 to the stud 2', and manifestly the standard may" be adjusted angularly from the vertical osition in whichit is shown P 1 vide'd with wings 27 wh1ch,"when the keeper in Figure IV. V

,j In the suitably grooved ways 5 a stencil 2O is removably retained'beneath the floor 4 of plied. [The stencil comprises a carrier p atc'21' which is ordinarily formed of'sheet metal. The lower surface 22 is unobstructed, and is shaped to conform wlth the surfaces to' be marked-in this case, a plane surface.

The carrier plate isgprovided with an opening 21a (Fig. VI); and with strips 23 mounted upon the upper face of plate 2i and ex tending along opposite sides of opening 21a and forming with the plate grooves for guid mg and for retainlng in position the vcharacterebear ng plates 24.

The character-bearing plates 24jare con-' veniently formed of sheet metal and consist each of body portion substantially corresponding in length to the breadth of theopening 21a, to which body-portion thenumeral; 24 is immediatelyapplied, and ofopposite terminal tongues 25. The tongues 25 are'oifset with respect to the'body 24 by an'interval which corresponds to the thickness of the carrier plate 21 Thecharacter-bearing plates are thus adaptedto be set in the opening in carrier plate-21, with their terminal tongues over-lapping upon the upper face of the carrier plate and 'benea'thstrips '23, and with 1 the lower surfaces of their body portions extending in common plane with the lower surface 22 of carrier plate 21, i

The strips 23 overlie the tongues 25 of the charaCter bearing plates, as shown inFigure VI, andtin order to' remove'a character-bearmg plate 24, it must be slid lengthwiseof thei strips and opening 210; past 'the left-hand ends of the strips (Fig. II) whence it is free to be removed and replaced. When a desiredlegend has been composed by the arrangement of several character bearingplates say six character-bearing plates, a keeper 26 is inserted to 'stay the saidplates' and retain them in tightly closed 'side-by-side. relation 9 in the carrier plate 21. The. keeper-.26 is formed ofresilien't sheet metal, and is prothe s r psfi i t pre a a ns h t r'eurfaces or the stri s. Friction bevm be applied.

tween the flexed keeper and the strips 23 is effective to secure the keeper in position.

Each plate 24 may by cutting be caused to bear its own distinctive character 24a. In Figure II the assembly is shown of a plurality of character-bearing plates in the opening of the carrier plate. Manifestly any arrangement of particular characters is possible, and characters of any sort, whether numerals, letters, or conventional signs or designs may be formed in the individual plates 24. Plates of uninterrupted continuityblank plates, with no character cut through themmay be interposed, to effect, proper spacing of characters. Facility in change and adaptation of the stencil as a whole in applying diflerent particular legends or other designs to surfaces to be marked is manifestly possible.

It will be noted that the carrier plate 21 is formed with off-set lateral flanges 28. These flanges are off-set at an interval suiiicient to enable the tops of the strips 23 to pass freely beneath. the floor 4 of the base when the stencil is positioned with the flanges 28 inserted in the ways 5, and slid into the position assumed during use; that is, into the position shown in Figure V, which places the effective portion (the character-bearing )ortion of the stencil in ex sosure throu h window 40. -By forming the carrier plate with the oft-set flanges 28,. and by forming theIcharacter-bearing plates 24: with off-set terminal tongues and sobringing the lower surfaces of these plates to common plane with the lower surface of the carrier plate, it is manifest that in use thecharacter-bearing plates will come into close contact with a surface to which the stenciling device may Adjustably mounted at an interval of space above the stencil-carrying base is a paint-gun 3. The mechanical construction and operation of the illustrated paint-gun 3 are well known to the art, and precise description of it is unnecessary. In general, however, the paint-gun is connected to a sourceofcompressed air,'andthe air, as in operation it is released through a small ori- ,fice, draws a suitable printing fluid from a container andeniits a jet 9 of air carrying in atomized condition the printing fluid. In the drawings,the compressed air enters the paint-gun through a tube 6, and a bottle 7 contains the fluid which is drawn through a tube 8 into the gun. If the bottle be positioned at some elevated station remote from the ap paratus (as, obviously, it may be) gravity will aid the flow of fluid into the gun.

Although the paint-gunB in and of itself is well known, its organization with the instrumentalities of our device is deemed to be novel. On, the upper extremity of standard 1 there is formed a boss 19, suitably bored to,

receive'the stem 13 of a clincher-bracket 11 in which the paint-gun 3 is secured. Arranged with the thumbscrews 14 to be fixed at various positions on the stem 13 are collars 15a, 15b bearing against the boss 19 and adjustably securing the paint-gun in the desired position laterally of the device. Oompleinentary longitudinal adjustment of the point-gun may be had by swinging the stand ard 1 on set-screw12. l

'In stenciling, the jet 9 of air and printing fluid is directed toward the stencil-carrying base and plays upon the effective area of the stencil; that is to say, upon the area of the stencil which is exposed by the windowed floor 4 of the base. As may be seen in Figure I, the jet 9 diverges downwardly, and attains a breadth which is as great as the breadth of the window 40. Two auxiliary air jets (see Fig. IV) may be directed obliquely downward upon jet 9, and from op osite sides, to control the breadth of the Jet 9. While, of course, the depth of jetv 9 is relatively slight, it may be varied both in breadth and depth by proper control of jets 10. To permit the jet in its depth (transversely, Fig. IV) to cover the efiective area of the stencil we have movably mounted the paint-gun. The mounting of the stem 13 in the boss. 19 is expedient to this end That is, byswinging the paint-gun and its supporting bracket 11 on the axis of the revoluble stem 13, the spray orjet will, in striking the stencil, travel in accordance with the angular movement of the gun. As shown in Figure VII, adjustable stops 16 may be set in lugs 17 on the standard 1 to limit the rotary movement of the paint-gun and to confine the travelling of the jet within desired limits. That is to say, a set-screw 18 forms in effect a protuberance on the collar b, and the inner ends of the thumb-screws 16 afford adjustable stops to limit movement ofthe screw 18, and thereby confine rotation of the paint-gun within the desired limits.

' A tally may be included with the device, for indicating the total number of markings which the device has made during a certain interval of time. This recording feature is found to be particularly advantageous in steel-sheet mills where it is customary to inspect, count, and mark each sheet. At variance with the usual practice one attendant may attend to all three of these matters. Our device does not require close supervision in operation- It may be placed on a sheet and intuitively operated-operated by feelwhile the operator is searching for defects the sheet which he is marking; and, of course, the tally records each application, whereupon the number of sheets may be determined.

lVe haveshown a tally 80 in FigureVIII, a tally which indicates progressively in units of one each oscillation of the tally-operating arm 81.. The tally 80 may conveniently be attached to the flange 4a of the stencil-carrying base, and a floating pin 82 may be supported in a bracket 83. The pin 82 is provided with a grooved head 84 to receive the arm 81, and the lower end of the pin normally extends below the plane of the stencil 20. By placing the stencil upon a surface to be marked, the tally-operating arm 81 is raised to record one application. Manifestly, a saving of time and of labor is realized.

A further important advantage of the stenciling instrument is worthy of mention. It has to do with the marking of metal sheets which are provided for protection with a thin film of oil. In marking such sheets, it has to our knowledge always been necessary preliminarily to remove the oil from the surface before the printing fluid may be satisfactorily applied. We have found, however, that the paint-gun may be so operated and so positioned relatively to the stencil 20 that the characters or patterns may be directly applied to an oily surface. That is to say, if the paint-gun is operated by air under a pressure of 40 pounds, and the spray or jet orifice of the paint-gun is arranged from 7 to 9 inches from the stencil, a peculiar action takes place. The mixed jet of air and printing fluid penetrates and replaces the oil on the surface which lies immediately beneath the cut-out portions of the stencil, and sharp and legible characters are, as a result, applied to the sheet.

What we claim is:

1. In a portable stenciling machine which is movable as a unit to a position of rest upon the surface to be marked, the combination of a supporting base for the machine, a stencil removably secured in said supporting base, which stencil conforms to the surface to be marked and comprises the bottom face of said base which is adapted to lie in close contact with said surface to be marked, a standard extending upward from said base, and a paint-gun movably secured to said standard above said base and its included stencil.

2. In a portable stenciling machine which is movable as a unit to a position of rest upon the surface to be marked, the combination of a supporting base for the machine, a stencil removably secured in said supporting base, which stencil conforms to the surface to be marked and comprises the bottom face of said base which is adapted to lie in close contact with said surface to be marked, a standard extending upward from said base, a paintgun movably secured to said standard above said base and its included stencil, and adjustable means for limiting the extent of such movement.

3. In a portable stenciling machine which is movable as a unit to a position of rest upon the surface to be marked, the combination of a supporting base for the machine, a stencil removably secured in said supporting base,

which stencil conforms to the surface to be marked and comprises the bottom face of said base which is adapted to lie in close contact with said surface to be marked, a standard extending upward from said base, a paintgun revolubl secured to said standard above said base an its included stencil, and adjustable means for defining an are through which said paint-gun may be revolved.

4. In a portable stenciling machine which is movable as a unit to a position of rest upon the surface to be marked, the combination of a windowed supporting base for the machine, a stencil removably secured in said base within the area of its Window, which stencil conforms to the surface to be marked and upon which surface the stencil is adapted to rest,

a standard extendin upward from said base,

a paint-gun revolu ly supported by said standard, an are through revolved.

5. In a stenciling machine, the combination of a base, a stencil removably secured in said base, a standard extending upward from said base, a paint-gun revolubly supported by said standard, and adjustable means for defining an angle through which said paint-gun may be revolved.

In testimony whereof we have hereunto set our hands.

HERMAN ANDERSON. RAYMOND J. GANNON.

and adjustable means for defining which said paint-gun may be

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