US1694490A - Marking device - Google Patents

Description

Dec. 11, 1928. 1,694,490

E. sALzMANN MARKING- DEVICE Filed July 28, 1924 E! 0 IH E5 9 lr.: l, 2 9

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UNITED STATES PATENT oFFics. i

ERNST sALziviANiv, voF soLoTHURN, SWITZERLAND.'

MARKING DEVICE.

Application led July 28, 1924, Serial No. 728,763, and in Germany August G, 1923.

This invention relates to improvements in marking devices, and has particular reference to an instrument used by draftsinen to mark or locate points which are subsequently utilized for describing arcs and circles and determining measurements.

l/Vhen making a drawing either on plain or lined paper, it often becomes 'necessary to repeatedly use a particular point on thesheet as a center for describing arcs and circles and determining measurements. 'Ivhese points, which are customarilymade with a compass, are some times difiicult to .locate with the result that considerable time is lost.

In accordance with the present invention the above disadvantage is`overcoine by the provision of an instrument which may be readily manipulated to make a point by pricking the drawing surface and the saine time marking or locating said point by means of a marking cartridge so that the point will at all times be readily discernible. The device may also be provided with a sharpening tool by meansoi:l which the marking edges of the cartridge may be kept sharpened.

The inventive idea is illustrated in the accompanying drawing which shows preferred modifications.

In the drawing Fig. 1 is a longitudinal section showing the instrument in position for forming ay point; y

Fig. Q is a similar view showing the parts in position for marking said point;

Figs. 3 and 4 are side elevations ot the instrument taken at right angles to Figs. 1 and 2, respectively. h

Figs. 5, 6 and 7 are cross sections on the lines 5 5, 6 6 and 7 7, respectively, of Fig. l.

Figs. 8 and 9 are partial elevations of a second form of construction in the pricking and marking positions. A

Figs. 10 and 11 are sections of the marking cartridge, Fig. 10 being taken on the linel 10 10 of Fig. 1.

Fig. 12 shows the sharpening tool without protecting cap',

Fig. 13 is a protector screwed on the instrument, and

Fig. 14 is an enlarged view of the mark made by the instrument. l

A sleeve 4 is bifurcated at its lower end for a major portion of the ength-thereof and slidably mounted in the iturcated end of said sleeve is a slider i greater width than the sleeve as shown in Figure 6 to permit ythe operator ot' the device to grasp the projecting edges of the sliderand thus force the same downwardly. The lower portion of the slider 5 `is slotted, as indicated at 5',

to receive the head 3 to which the spindle 2 is I provides a bridge or connecting piece at the lower end of said sleeve which extends through the slot 5 as shown in Figure 5. The lower extremity of said sliderterniinates in a head 6 which has a bearing on the spindle 2 and which has a portion 6 pror jectiiig upwardly end of the sleeve 4.

The head6 is split at its lower end to forni a holding portion 7 for receiving the upper end of a tubular marking cartridge 8 fitted over the spindle?. and preferably made 0i'` soniccolored material suchas graphiteio'i" chalk, the lower end ofsaid cartridge being tapered to formv a sharp marking edge which will make a distinct circle about the point of the pricking needle when the latter is engaged with a drawing surface and the slider subsequently depressed to contact the lower end oil the cartridge with said surface and thereafter given a slightv rotation.

In order to retain the slider 5, and consequently the cartridge or marker 8, in aV retracted or normal. position, as shown in Figurcs l and 3, the sleeve 4 carries a disc 11 through which extends vthe lower end of a rod 10 secured to the upper end of the slider 5, said rod terminating at'its upper end in a head l0 in the form of a piston. Interposed between the head 10 and the disc 11 and encircling the i'oid l0l is an eXpansible coil spring 9 which normally bears against the head 10 to retain the same in its uppermost position with the result that the slider 5 and the cartridge 8 are also yieldably held in their normal retracted positions. Howinto the lower bifurcated i.

ever, when the slider 5 is depressed the rod l 10 is carried with it and operates, through its head 10,to contract and place under tension the spring v9 as shown in 'Figure 2 and when said slider is released, after making a mark on the drawing surface about the needle point 1,-r said spring Will expand and thus again restore' the various parts to' normal.

8 and 9 differs from the construction above described only inthe arrangement of the lower end of the slider and of the lneedle holder. i j j y The spindle 12 is loosely mounted on the spindle 2,for longitudinal movement relative thereto and has its threads engaged with internal threads lformed in the head G.V The upper end of the spindle 12 carriesa disc :or

enlargement 13 which is interposedy between the lower end of the head 3 and the head 6, vits engagement with the latter head preventing complete detachment of the spindle 12 therefrom. With the vparts in the normal position `shown in Figure 9, a. downward movement of the slidei 5 carries the spindle with it, without-turning of said spindle, until tliemarker 8 engages the drawing surface, as shown in Figure. At this; time the disc 13 is still in engagement with the head 6, but upon further pressure being applied to the slider 5 to move it to the position shown in Figurev 8, the spindle 12, being no longer capable of downward movement, will be turned relative to the spindle :2 by reason of the screw threads in the head 6, thereby 'causA ing the marker 8 to make a circle about the point'formed by the spindle 2. Upon removal of the instrument from the drawing surface and consequent retraction of the slider 5, its head 6 will draw the spindle 12 back to its normal position shown in Figure 9.

The sharpening tool shown in Figs. 12 and 13 consists of a hand-piece 14 which is provided with a toothed hea-dl for sharpening the outer edge of thel end of the cartridgeand with a sleeve 16 with" a toothed edge for sharpening the inner edge of the end of the cartridge. l

This sharpening tool may be screwed into the upper end of the sleeve 4 and be protected byua cap 17 screwedover the top of the sleeve and thus protected as shown in Fig-13, but the instrument could be provided with such a sharpening tool, the sharpeningl tool being disposedin a separate cap. r

Having now particularly described and as-v certained the nature of my said invention and lin what manner the same is to be performed, I declare that what I claim is 1. A marking instrument for use in making drawings,` including a spindle having a prickingneedle adapted to form a ypoint in a drawing surface, a s lidingrmember having a bearing von said spindle and movable along.

the sa1nea marker4 carried by said sliding member and movable therewith from a normally retracted position into engagement withsaid drawing to vform a mark thereon adjacent the point formed by said needle,

' retracted position.

and means for normally retaining said with said drawing surface to form ar mark thereon adjacent the point forme'dby vsaid fneedle, and meansfor normally retaining.. saidmarker and sliding member iii,tlieirre.

tracted positions. f f j l 3. A marking instrument for use in making drawings, including a spindle. having Aa 'K pricking needle adapted to form a point in a drawing surface, a sliding member movable along said spindle, a marker carried,

said sliding member andmovable therewith from a normally retracted position into en-l gagement withsaid drawing surface toform a mark thereonv adjacent the point formed by said needle, a sleeve for said sliding memj y ber having a bifurcated vend forming position.

guides i for receiving and supporting said member, fr and means enclosed by said sleeve for nor.L mally retaining said marker in its retracted i L A markinginstrument for use inmak-y ing drawings, 'including a spindle having a -pi'icking needle adapt-ed to form a point in a drawingl surface, a sliding member movable along saidl spindle and terminating at one end in a split head, a marker mounted in saidl L' split head and movable with saidv sliding member from a normally retracted position into engagement with said drawing surface to form a mark thereon adjacent thepoint vformed by said needle, a sleeve for said sliding member having a bifuicated end forming guides for receiving and supporting said member, and means enclosed'by saidsleeve for normally retaining*saidmarker in itsy 5. A marking instrument for use in male ing drawings, including aA spindle having a pricking needle adapted to form a point ina drawing surface, a sliding memberhaving a bearing on said spindle and movable, along the same, ainarker carriedbysaid sliding member land movable therewithv from al normally retractedy position into .engagement with said drawing surface to form; a mark thereon adjacent the pointformedby said needle, means forv normally retaining said marker in its retracted position, and means vfor causing rotation of said marker after the sliding member. has been moved along said spindle to engage ther marker withsaid sur-N face.

ERNST fsALzMANN.'

In testimony whereof I aHiX my signaturem,

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