US2467083A - Marker - Google Patents

Description

April 12, 1949. A. J. FRANCIS, .JR

MARKER Filed May 2, 1945 Patented Apr. 12, 1949 UNITED STATES PATENT OFFICE MARKER Application May 2, 1945, Serial No. 591,535

2 Claims.

This invention relates to an electric marker and has for one object to provide a marker and a mechanism for operating it by means of which the marker is given a large number of rapid strokes, so that it may :be used as a marking, cutting or other tool.

In the particular form here shown the invention is embodied in an electrical marker which includes magnetic means cooperating with mechanical means for -causing reciprocation of a tool carrying member. An object of the invention is, therefore, to provide a combination of electrical and mechanical means for accomplishing the results stated.

Another object of the invention is to provide means for utilizing alternating current in an eiiicient and effective manner to provide the electrical phase of the total operation.

Another object is to provide an electrical circuit which may advantageously be used in connection with and for the purposes stated.

Other objects Iwill appear from time to time throughout the speciiication and claims.

This invention is illustrated more or less diagrammatically in the accompanying drawings, wherein:

Figure 1 is an end view of the device, taken generally from the left end of the structure shown in Figure 2;

Figure 2 is a longitudinal section with parts in elevation, taken at line 2-2 of Figure l;

Figure 3 is a partial section with parts in elevation, taken generally at right angles to the plane of Figure 2;

Figure 4 is a transverse section taken at line 4-4 of Figure 2; and

Figure 5 is a sectional detail of the switch, taken at line 5-5 of Figure 2.

Like parts are indicated by like characters throughout the specification and the drawings.

While almost any form of housing or casing may be used, the one illustrated herewith is a convenient form and comprises generally two halves I and 2. It is convenient to form them so that they interlock and so that a fastening means may readily engage both of them. Thus, as shown, the half l is provided with a raised edge Ia, and the half 2 has a raised edge 2a. Adjacent each raised edge is a cut-away lportion, so that when the parts are assembled together they interlock, as shown particularly in dotted lines in Figure 1. At that end they may be conveniently joined by a staple-like member 3 which passes through both casing members. The casing members are irregularly shaped, as shown, to

form adjacent one end an enlargement suitable for enclosing the magnets, and they are reduced adjacent the other end and may be held together by a band 4. A pair of spacing and sup porting rings 5 and 6 are positioned within the reduced portion, as shown particularly in Figure 2, and a tube or barrel 'I is fixed in these rings.

A connector member 8 is fixedly supported upon the tube l. From this member are supported hollow coils 9, 9, and from this member are also supported U-shaped laminations I0.

Another set of U-shaped laminatons II is secured to a yoke member I2, which is itself iastened to a shaft I3. This shaft is free to slide within the tube l and the other parts which will be described below. A collar I4 is fixed on the shaft I3. An adjusting nut I5 is threaded into engagement with the tube 1 and may be provided with an enlarged knurled or otherwise roughened portion I6.

A spring I'I is positioned about the rod I3 and bears at one end against the collar or shoulder I4 and at the other end against the adjusting nut I5. The rod I3 is threaded at its lower end, as at I8, and engages a chuck collet I9, which at one end forms a shoulder 20 in opposition to the corresponding shoulder 2I formed in the adjusting nut I5, as shown particularly in Figure 2. Threaded upon the chuck collet is a chuck shell 23. By means of relative adjustment of the chuck collet and the chuck shell a Iwriting tip or marking point member 24 may be removably and adjustably vpositioned in the collet. Positioned about the exterior of the tube 1 and bearing at one end upon the collar or stop 6 and at the other end upon the shoulder 25 formed on the exterior of the adjusting screw I5 is a spring 26. The purpose of this spring is to hold the adjusting screw in adjusted position and to prevent its displacement from that position, once it has been adjusted.

Current for energizing the coils 9 is conducted to them by wires 2'I which pass through the housing, through any appropriate opening which may be surrounded by a grommet 28. The coil circuit includes wires or connectors 29 and 30 which are led to the switch enclosed in the housing 3| from which a handle or operating means 32 projects. As shown in Figure 5, the connector 29 is joined to a contact 33 within the switch housing and the connector 30 is joined to a contact 34 within the housing. The switch handle or lever 32 has fixed on it the operating pins 35 and 36, and these, when moved in one position, actuate the member 31 to bring it in contact with the two .3 contacts 33 and 34. When in another position, not shown, the member 31 remains out of contact with the contacts and the circuit is not closed.

As shown in Figure 3, name or marking plates 38 may be inserted in the housing.

Although I have shown an operative form of my invention, it will be recognized that many changes in the form, shape and arrangement of parts can be made without departing from the spirit of the invention, and my showing is therefore to be taken as, in a sense, diagrammatic.

The use and operation of this invention are as follows:

The marker of this invention is intended to be used with alternating current. When a suitable marking point or writing tip 24 has been put in place, the wires 2l are connected with the source of current and the switch is operated to complete the circuit and the coils 'are energized. The pull developed by the coils as the alternating current grows to maximum value draws the upper set of laminations I l down toward the xed laminati-ons I0, closing the gap which appears between them in Figure 2. When this occurs, the spring I1 is somewhat compressed, and the rod I3 is moved downwardly, carrying with it the point 24. After the peak of the half wave of the current is reached, the current begins to decrease to zero and the pull on the movably mounted laminations III is reduced. The spring I'I' is then free to expand and in doing so it carries the rod I3 and the laminations Ii and the point 24 upwardly, that is to say, it withdraws the point somewhat into the housing, and the laminations II are restored tothe position indicated in dotted lines in Figure y2, in which there is an air gap between the laminations ylli and the lamin'ations I I.

With an ordinary 60-cycle circuit, there would be 7,200 strokes per minute, so long as the switch is in position to vcomplete the circuit and to cause the magnets to be energized. A fluctuation of the current within the magnets is dependent, of course, upon the aiternations of 'the current, and by this means a rapid and strong reciprocation of the shaft I3 and of the point 24 'isaccomplished The length of the stroke is adjusted by rotating the `member I6, which moves it longitudinally with respect to the tube fI. To accomplish adjustment of the stroke, the member IE is turned, for example, clockwise, which increases the pressure on the spring Il, thus holding the gap between the two sets of lamin'ation's open yfor va greater distance. vThe spring 26 serves to prevent acci*- de'ntal or undesired movement `'of lthe adjusting nut I6. The 'chuck assembly is supported in the longitudinally extended portion vof the housing,

4 where the two are in contact over an extended area, as shown generally at the right end of Figure 2.

The wires or cords 21 which come out of the handle have been placed half way down the casing deliberately. It has been found in the past that where the cord was brought out to the end of the casing, it presents a certain drag in use. Where it is `brought out at the point indicated herewith, it conveniently fits under the users hand, which will generally be engaged about the reduced portion of the housing and offers no resistance to the free movement of the tool.

I claim:

yl. In combination in an electrical marker, a housing, a barrel xed therein, a pair of solenoids fixed with relation to said barrel, fixed armatures within said solenoids, a reciprocating shaft mounted within said barrel, a U shaped member secured to said `shaft and extended into said solenoids toward said member, spring means tending to move said shaft in one direction, said solenoids when energized tending to move said shaft in an opposite direction, a collet fixed to said shaft, a marking pointer secured in said collet, and conductors for supplying current to said solenoid to energize it.

2. In combination in an electrical marker, a barrel, 'a plurality of solenoids ixed with vrelation to said barrel, a plurality of xed armatures within said solenoids, 'a reciprocating shaft mounted `within said barrel, `a U shaped member secured to said shaft and extended yinto said solenoids toward said fixed armatures, spring means tending to move said shaft in one direction, said solenoids when energized tending to move said shaft in an opposite direction, a collet xed to said shaft, a `marking pointer secured in said collet, conductors for supplying current to said solenoids to energize them, and a switch 'for interrupting and completing the circuit to said solenoids.

ANDREW J. FRANCIS, Jn.

REFERENCES CITED The following references are lof record 'in the file of this patent:

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