US2346474A

US2346474A - Engraving tool

Info

Publication number: US2346474A
Application number: US325445A
Authority: US
Inventors: Torre Miguel De La
Original assignee: Burgess Battery Co
Current assignee: Burgess Battery Co
Priority date: 1940-03-22
Filing date: 1940-03-22
Publication date: 1944-04-11
Anticipated expiration: 1961-04-11

Description

plil-ll, lg44. M. DE LA TQRRE 2,346,474

ENGRAV ING TOOL Filed March 22, 1940 747.11 may?.

INVENTOR ATTORNEYS Patented Apr. 11, 1944 N u luirili STATES PATENT `OFFICE I 1 Miguel de la Torre, New Haven, Conn., assignor,

by mesne assinments, to Burgess Battery Company, Chicago, lll.. a corporation of Delaware Application March 22, 1940,.Serial No. 325,445

(c1. 'xs-13.1) My invention relates tolnew and useful im-y 7 Claims.

provements in engraving An important object of my invention' is to provide a tool for engraving, burning, beating, or embossing glass, metals and like materials, which may be electrically operated from any convenient v source oi'v current supply. i l

Another object of myinvention is to providea tool of the .above-mentioned character which includes an engraving point and means to impart a point being suiiicient to perform the engraving operation.

Other objects and advantages of my invention,

will be apparent during the course of the follow.

ing description,

In the drawing, forming a part of this` specifi-l cation, and wherein like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of a device embody-,-

ing myA invention, y

Figure 2 is a longitudinal sectional view taken on the line` 2--2 of Figure 1, I f

Figure 3 is a bottom plan view of my device,

Figure 4 is a fragmentary side elevation, showing parts in section, and illustrating a modiication of the clamping means for holding the engraving needle,

Figure 5 is a transverse sectional view taken on the line 5 5 of Figure 4, and

Figure 6 is a fragmentary side elevation of my device, and ,showing an Vattachment incorporated therewith for burning the surface of the work.

In the accompanying drawing, wherein for the f the end ofthe armature.

purpose ofl illustration, is shown a preferred emwhich the `coil of wire l5 is wound, and from,

which the coil isv insulatedby: thefmateriari'i 'I'hesid walls'of the'casing are bowed outwardly, as at I1 and I8, toaccommodate the laterally extending portions of the core and the endsl Il of the core extend outwardly of the casing and are adapted to be vconnected with any suitable source of current supply. The top wall 2l o1' the casing is spaced substantially above the core and lwindings to deiine the amature chamber 2|,

which chamber is of substantially greater depth than the armature 22 arranged therein. The end 23 of theI armature is Yheld in close proximity to l lation with the casing and to permit the opposite end 25 of the armature to have a substantially free oscillatory movement between the top of the kcore and the top wall 20 of the casing. An adjusting screw 26 is carried by the top wall 2l ad jacent the end 25 of the armature and the inwardly extending end thereof is adapted to be contacted by the armature.l The extending end of the screw may be advanced or retracted to limitthe oscillatory movements oi' the vibratory end of the armature.

The depending tube 21 is welded, or otherwise secured, to the bottom wall of the casing below A sleeve 28, of a suitable insulating material, is snugly pressed over the tube 21 and with its upper end 28 abutting the bottom wall of the casing. The lower end 3l of theinsulating sleeve extends substantially beyond the tube 21 and the extending portion is enlarged and formed with an internally screw,-

threaded bore 3|, which bore is of slightly largerdiameter than is the tube 21. A bushing 32 is threadedly received within the bore 3| and the lock nut 33 is carried by the bushing and adapted to be moved into abutting engagement with the lower end 3| of the insulating sleeve to x the movement of the bushing in a. selected, advanced or retracted position.

A driving rod 34 extends through the bushing, through the tube 21 and into the armature chamber 2| below the oscillating end 25 of the armature, and a coil spring 35 is interposed between the inner end of the bushing 32 and the annular collar 36 formed on the rod and peripherally engaging the inner bore of the tube 21. The resilient action of. the spring urges the end 3i of the'driving rod into pressed engagement with the bottom face ofthe armature and acts to hold the vibrating end lof the armature against the inwardly extending 4endl o1` Qthe adjusting screw,

The portion of the driving rod extending through the bushing is enlarged to constitute a head portion 31 adapted to snugly, but slidably, engage the inner bore of the bushing. The portion of the head extending beyond the bushing is provided with an end recess 33 to receive the engraving needle 3l and a set screw 4I, carried by and extending laterally from the head is adapted to secure the needle within the recess. Y

When an alternating current is supplied to the winding i5, a magnetic field will be created to alternately attract and repel the armature, 22. 'Ihe effect on the amature will be to produce a vibratory'actuation of the end 25 thereof and the vibration of the amature in the abovemanne'r will produce an axial vibration of the driving rod 34 which operates against the resilient 'action of the coil spring 35. The bushing 32 may be advanoedor retracted from the bore 3l to vary the tension of the coil spring and the adjusting screw 28 may be advanced into or retracted from vthe armature chamber 2l to selectively position thevibrating end 25 of the armature. The actuation of the driving rod in the above manner will cause the engraving point 29 to rapidly vibrate against the work 4l and to etch or engrave Athe contacted surface thereof. By suitably positioning the bushing 32 and the adjusting screw 26, the stroke of the driving rod maybe adapted to any hardness of material being operated upon. I have found that best results are obtained by holding the driving rod perpendicular to the surface of the work and sliding the emzraving point along the surface thereof. It is`.not necessary to force the point into or against the surface of the work, the weight of the device plus the vibratory motion of the point being' sufficient to hold' the point in engagement with the surface and to produce the desired effect.

As already pointed out, the stroke Aof the driving rod may be easily and expeditiously adjusted to the particular hardness of the material being operated upon, and the point 39'mayv be easily sharpened by holding the point at the proper angle against a piece of carborundum'jor the like. When desired, a used or broken point may be easily removed from the head of the driving rod and a new one substituted therefor.

Figure 4 illustrates a modification of the head 3l. The bushing 32 is provided with a'substantially -square bore and the head 31 of the driving rod is shaped to conform therewith in a manner to prevent rotation of the head relative to the bushing. 'Ihe end 42 of the head is tapered and provided with right-angularly disposed cuts which define gripping lingers adapted to engage the engraving point when the `chuck 43 is threaded onto the head.

Figure 6 illustrates an attachment'which may be applied to the device to produce a burning of the work 4l. The attachment comprises a stepdown' transformer 44 including the conventional core 45, primary coil 46 and secondary coil 4l. The leads 48 and 49 of the primary coil lead to a suitable source of current supply, and theleads l and 5| of the secondary coil are connected'to a clip 52 and a clamp 53, respectively. The clip 52 comprises 'a split sleeve 54 adapted to be snugly fitted to the enlarged head portion 31 of the driving rod and a depending spring arm 55 carried by the sleeve yand frlctionally engaging the engraving point. The metallic clamp 53 may be of any suitable shape or construction and includes cooperating jaws l. and 61 adapted to asienta grip a portion of the work 4I. The transformer 44 will provide low voltage current which will flow from the transformer through the secondary lead ll to the engraving point, and, upon engage- 5 ment of the point with the work, the current will flow thmugh the work to the clamp 53 and through the lead 3| .back to the transformer. When the point is applied to the surface of the f work 4lv the vibratory movement thereof will l0 produce an arcing between the point and the work to burn the surface contacted by the point. It is to be understood that the `form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the size, shape and arrangement of parts maybe resorted to without `departing from the spirit of my invention, or

scope of the appended claims.

Having thus described my invention, I claim:

1. VAn engraving thol, comprising a casing having an elongated tubular stem, a rod extending axially through said stem and into said casing and being adapted to carry a tool element at the distal end thereof, a vibratory hammer within said cas- 2'5 ing and adapted to move said rod toward said distal end upon energization of said hammer, means for energizing said hammer, and spring means cooperating with said rod to normally hold the same in pressed engagement with .said hammer.'

` 2. An engraving tool, comprising the combination of a casing having an elongated tubular stem, an independently movable rod extending axially through said stem and into said casing and being a5 adapted to carry a tool element at the distal end thereof, a vibratory hammer within said casing and adapted to move said rod element toward said distal end upon energizationof said hammer, means for energizing said hammer, spring means cooperating with said rod to normally hold said rod in pressed engagement with said hammer, and adjustable means for varying the tension of said spring means. l'

3. An -engraving tool, comprising the combination of a casing having an elongated tubular stem, -an independently movable rod element extending axially through said stemand into said casing and being adapted to carry a tool element at the distal end thereof, a vibratory hammer within said casing and adapted to move said rodelement toward said distal end upon energization of said hammer, means for energizing said hammer, an adjustable element carried by said casing and contacting said hammer to regulate-the vibratory 5.5 movement thereof, spring means cooperating with said rod to normally hold the same in pressed engagement with said hammer, and adjustable means to vary the tension of said spring means.

4. An engraving tool comprising the combina- 50 tionof a casing having an elongated tubular stem, a bushing snugly receiving the extending end of the rod and screw-threadedly received 7 within the bore ofthe stem for axial adjustmenttherein,l aspring interposed between said projec`l tion and the bushing for holding the first-men tioned end of thev rod in pressed engagement with the hammer, said spring being selectively tensioned by movement oi thev bushing relative to said stem, and'a needle element mounted in the extending end of the rod.

5. An engraving tool comprising the combination of electro-magnetic means,y a pivoted armature therefor and a rod adapted to carry a needle element at one end and to be actuated axially at its other end by said armature, said rod abutting said armature at a point removed from the pivot of said armature, the end of said armature removed from said pivot being free to move away from said electro-magnetic means, stop means to limit said movement of said armature away from said electromagnetic means, casing means for said electro-magnetic means, axial guide means for said rod associated with said casing means, spring means cooperating with said rod to normally press said rod against said armature and move said armature away from said electromagnetic means and against said stop when not electrically activated, said arrangement being such that when said electro-nagnetic means is electriu cally activated said armature is attracted thereto against the spring pressure on said rod.

6. An engraving tool comprising the combination of a housing containing electro-magnetic means having an armature associated with the upper portion thereof, said housing having its upper wall spaced substantially from said armature when said armature is in the activated position, said housing having an elongated tubular stem, a rod extending axially through said stem and into said housing, said rod being adapted to carry a needle element at one end thereof, spring means cooperating with said rod to normally press said rod into said housing and against one end of said armature, said armature having its opposite end pivotally held adjacent said electromagnetic means, said iirst end being free 'to move and normally held away from said electro-magnetic means by said rod, said arrangement being such that when said electro-magnetic means is electrically activated said armature is attracted thereto against the spring pressure on said rod.

7. An engraving tool comprising the combination of a housing containing electro-magnetic means having an armature associated therewith,

.into said housing and against one end of said armature, said armature being pivotally mounted with said rod abutting a portion thereof removed from the pivoted part, said armature being `free to moveaway from said electro-magnetic means when the latter isl not activated, said armature being normally held away from said electro-magnetic means by said rod, said arrangement being such that when said electro-magnetic means is electrically activated said armature is attracted thereto against the spring pressure on said rod. MIGUEL DE LA TORRE.