US700437A - Apparatus for electrically operating tools. - Google Patents

Description

2 Sheets-Sheet l.

Patented May 20, I902.

(Application filed Apr. 11, 1900.)

C. E. MOORE. & C. J. REILLY. APPARATUS FOR ELECTRICALLY OPERATING TOOLS.

(No Model.)

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- Patented May 20, I902. C. E. MOORE & C. REILLY.

APPARATUS FOR ELECTRICALLY OPERATING TOOLS.

7 (Application filed Apr. IL 1900.) (No Model.) i 2 Sheets-Sheet 2.

UNITED STATES PATENT OFFIcE.

CHARLES E. MOORE, OF CHICAGO, ILLINOIS, AND CHARLES J. REILLY, OF SYRACUSE, INDIANA.

APPARATUS FOR ELECTRICALLY OPERATING TOOLS.

SPECIFICATION forming part of Letters Patent No. 700,437, dated May 20, 1902.

Application filed April 11, 1900. Serial No. 12.424. (No model.)

To aZZ whom it mag, aonccrn:

Be it known that We, CHARLES E. MOORE, residing at Chicago, in the county of Cook and State of Illinois, and CHARLES J. REILLY, re-

siding at Syracuse, in the county of Kosciusko and State of Indiana, citizens of the United States, have invented certain new and useful Improvements in Apparatus for Electrically Operating Tools, of which the following is a specification.

Our invention relates to apparatus for electrically operating tools; and it contemplates an apparatus designed and intended for the purpose of utilizing an electric current to opcrate a hammer or other tool with great rapidity and with an expenditure of comparatively little electric energy.

The object of our invention is to provide an apparatus for operating tools electrically which is simple in construction, inexpensive to manufacture, easy to operate, and a feature of special importance which is designed and adapted to provide for the utilization of the greatest possible proportion of the electric energy employed by concentrating the lines of force to the point where it is desired to use them.

Our invention also has in view to provide for reciprocating a core with great rapidity by alternately energizing a pair of axiallyalined solenoids and confining these solenoids in such a manner as to form complete magnetic circuits around the core and greatly increase the efliciency of the device thereby.

5 Our invention also has for its objects to provide an apparatus of this character which shallbe generally smallin size and easily portable, so that it can be readily used for operating a tool, and for simplifying and per- 0 fecting the details, so as to make the device substantial in character and effective in operation, while at the same time it is light in weight and easily manipulated and developing a maximum efiiciency with an expenditure of comparatively little energy.

In the'accompanying drawings, Figure 1 is a longitudinal central sectional view through an apparatus embodying our invention, the core being shown in its forwardly-driven po- 5o sition, 'but without showing a tool in the holder. Fig. 2is a detailed enlarged sectional view showing the hollow or recessed end of the core and the switch devices. Fig. 3 is a diagrammatic view showing the circuits. Fig.

4 is a transverse sectional view on the lines 4 4. of Fig. 1.

In the drawings we have shown for convenience our improved apparatus as it would be constructed for operating a tool, such as a hammer, requiring a number of successive 6o blows; but we would have it understood that this invention is not limited to such embodiment, and it may be used in many diilierent ways and with various tools.

Referring to the drawings, in which like numerals of reference denote corresponding parts in the several figures, 5 and 6 designate two axially-alined solenoids, which consist of coils of insulated wire of any kind wound around non-magnetic sleeves 7 and 8. A mov- 7o able core 9, made of softiron or any other magnetic material, is adapted to be reciprocated through the sleeves of the solenoids by alternately energizing the solenoids in a manner hereinafterdescribed. Each of the solenoids is inclosed within a shield of magnetic material, which forms a complete magnetic circuit through the core and operates to concentrate the lines of force to the point where they are to be used. These shields are pref- 8o erably made of soft iron, and they consist of cylinders 10 11, surrounding the coils, and disks 12,01? uniform diameter, which fit snugly within the cylinders at each end of the coils and have a screw-threaded connection with the sleeves whereby they are held sccurelyin place.

The solenoids shieldedas hereinbeforc described are connected together mechanically to provide a complete and continuous body for the apparatus, as bya central cylinder 13, which has a screw-threaded connection with the two cylinders 10 11 and is provided with the annular shoulders 14. 15, against which said cylinders abut. This central cylinder is 5 made of non-magnetic material and serves to prevent the formation of amagnetic circuit from one solenoid to the other and at the same time forms, with thecylinders 1.0 11, a complete and symmetrical shell surrounding the tco working parts of the apparatus and constituting the body thereof.

At one end of the apparatus we provide a handle 16, which is mounted on a headpiece 17, having a screw-threaded connection with the cylinder 11 and provided with an abutting shoulder 18. At the other end of the apparatus is a cap 19 and a tool-holder 20, hereinafter described.

The core, which is reciprocated by and through the solenoids, is composed, preferably, of a solid section 21 and a hollow or recessed section 22. This hollow or recessed section may be made by boring out a solid core or by employing a tube, as shownin the drawings, which has a screw-threaded connection with a boss 23 on the solid section of the core or is otherwise connected therewith. On that part of the core which operates between the solenoids is a collar 2 L, adapted to prevent the core from dropping out of place and arranged to engage with the disks 12 and sleeves '7 S.

The switch device, comprising movable and stationary contacts, is arranged within the hollow or recessed section of the core at or about its outer end, the movable contact being rigid with and carried by the core back and forth upon the stationary contacts. The movable contact 25 is preferably made in tubular form and partly insulated by an interiorly-arranged insulating-sleeve 26, but having a part thereof in the form of a ring 27 un insulated to engage and make connection with the stationary contacts. This tube is held rigidly within the hollow section 22 of the core by means of an insulating-sleeve 28 or other suitable devices, so that it will be carried back and forth on the stationary contacts to make successive contacts therewith.

The stationary contacts 29 and 30 are independently supported within the tube 25, the contact 29 being carried by a spring contactstrip 31, of any conducting material, fastened to a stationary part, such as the head 17, and insulated therefrom by an insulating-strip The other stationary contact 30 is adjustably mounted on the screw-threaded end 33 of a metallic adjusting -rod 34:, which extends through the head 17 and is provided with an insulated cap 3%, by means of which the rod can be turned to adjust the contact 30 longitudinally on the screw-threaded end 83. This contact 30 rests and slides upon the strip of insulation 35, carried by the spring contactstrip 31 or otherwise fixedly secured in the tube 25, which prevents the contact turning with the rod, and it is prevented from working off of the screw-threaded end of the rod by the stops 36. The contact 29 is preferably arranged forward of the contact 30, so that it will form a contact with the ring 27 of the tube 25 when the core is in a forward posi tion, as shown, and the contact 30 is arranged to form a contact with the ring 27 of the tube when the core is in its retr cted position, the extent of movement of the core bero es? ing regulated by adjusting this contact 30 on its supporting-rod.

A circuit-closer 87 is screwed or otherwise secured in one end of the sleeve 38, carried by the rod 39, which passes through and is guided in the openings -tO and 41 in the head and handle, respectively, and is provided with a finger-piece 42, between which and the handle a spring t3 is located to normally hold the circuit-closer away from the circuit-closing contact-points 4t and 45, preferably made of spring metal. This construction and arrangement provides for securing the circuitcloser rigidly in its proper place, so that it can be operated in the desired manner and always effect a perfect closing of the circuit; but the details of this circuit-closer may be changed without departing from the invention.

The cap 19 has a screw-threaded connection with the cylinder 10, and it is provided interiorly with a shoulder-4G, between which and the end of the solenoid anon-magnetic sleeve 4:7 is arranged to constitute a guide for the hammer end of the core, this hammer forming a part of the core, but being made of some hard non-magnetic material, such as phosphor-bronze. The hammer is arranged to operate upon atool-holder 20 of any desired construction; but in the drawings we have shown this part provided with a socket to receive the tool and having a flange 49 around its upper end, which operates between the sleeve t7 and a shoulder 50 in the cap to retain the holder in the cap.

The circuits are illustrated in Fig. 3 and will be readily understood by reference thereto. Assuming that the parts are in the position shown in Figs. 1 and 2, in which the core has been carried to a forward position and is ready to be retracted, it will be observed that the current,tak en from any source of supply, will pass in through the feed-wires at the plug 51. and around through the insulated wire 52 to the circuit-closing contact-point tt and through the circuit-closer 37 to the contact 1-5 and contact 53 to the movable contact-ring 27, it being understood, of course, that the tube 25 constitutes the movable contact, although only the part 27 is adapted to make actual contact with the stationary contacts. From here the current passes through the contact 29 and strip 31 to the contact-ring 54: and finger 55 into the solenoid (3, and thence by way of the contact-finger 59 and ring 57 out of the apparatus through the wire 58. The passing of the current through the apparatus in this manner energizes the solenoid 0 and operates to retract the core until thepart 27 of the movable contact is in engagement with the sta tionary contact 30, whereupon the current is shifted to pass from the movable contact through the contact 30, rod 34, and wire 59 to the solenoid 5, through which it passes, and on through an insulated wire (30 to the finger 59, as before. The solenoid 5 may therefore be designated the workin g solenoid and the solenoid 6 the retractingsolenoid.

Instead of making continuous wire connections with the solenoids 5 we provide intermediate spring contact-fingers 61, which are carried by the cylinder 13 between the two solenoids. These fingers consist of springmetal strips having their ends bent or curved to engage with circular contacts 62 63 on the ends of the solenoids, the contacts 61 being insulated from the cylinder 13 and the contacts 62 63 being insulated from the disks 12, to which they are fastened, but each connected by wiring, as shown in Fig. 3. This construction provides a complete electric connection,while mechanically the parts simply contact without being fastened together, and enables the removal of either, or both, of the solenoids without requiring the unfastening of any electrical connections. hen the solenoids are arranged in position and the parts properly connected together, the spring-fingers 61 will be. sure to properly engage with the contacts 62 and 63 without requiring any special adjustment. We prefer to make the contacts 62 63 in the form of rings or parts of rings, so that a proper engagement of the fingers 61 therewith will always be obtained without the necessity of securing the solenoids in the cylinder 13 at any particular registration. By these means the parts of the apparatus may be easily and quickly assembled or taken apart and repaired or replaced without necessitating a fine adjustment or requiring any special skill to secure the desired connections.

Theapparatus as has been described consists, essentially, of two shielded solenoids and the central cylinder forming a mechanical connection between the shields inclosing the solenoids, and these parts are so constructed and arranged that they can be sep-' arated by simply unscrewing the solenoids from the central cylinder, the electric connections being formed in such a manner as to permit of this separation without requiring any attention on the part of the operator. When it is desired to assemble the parts, the coils having been wound on the sleeves and the shields arranged in place, the solenoids are slipped onto thecore and screwed into the cylinder 13. The spring contact-fingers 61 are arranged in such a position that they cannot fail to make proper contact between the rings or parts of rings 62 63in the circuit leading through the solenoid 5, and this connection is made whether or not the screwthreads are turned to a perfectfineness and the solenoids adjusted in the cylinder 13 to their exact correct position. The headpiece and cap are then secured in place with their as sociated parts in an obvious manner, and the apparatus is ready for its electric connections and a tool to operate.

The shields are provided with small openings .64: to admit air therein and to avoid heating of the coils, and the circuit-wires are arranged in a convenient and suitable manner in the air-space between the coil and its shield and in other parts of the apparatus, being wholly inclosed within and protected by the body thereof.

From the foregoing description and by reference to the drawings it will be observed that we have provided an apparatus of great simplicity for electrically operating tools which is free of complicated parts and easy to assemble and which depends upon no special knowledge or skill for its proper and successful working. The arrangement and combination of parts is of novel character and enables us to make an apparatus capable of operating with great rapidity and accomplishing superior results, which is very light in weight and of small compass, so that it can be carried around and handled with facility.

In the operation of the apparatus a tool is arranged in the tool-holder and the electric connection at the plug 51 is efiected. The tool is held up against the work, and the operator closes the circuit by pressing upon the cap 42, whereupon one or the other of the solenoids is energized to attract the core, and this movement of the core, as has been previously explained, breaks the circuit initially made and switches the current into the other circuit passing through the other solenoid, which immediately attracts the core, thereby again breaking the circuit and switching the current back into the first circuit. In this manner the core is continuously reciprocated at a very high rate of speed, according to the strength of the current. The coils and the other parts of our apparatus are proportioned according to the work to be done and the current to be carried, the current being taken from any source of supply and a resistance device of any suitable construction being used whenever necessary.

I11 starting the apparatus in operation it is first necessary to secure an engagement be tween the movable contact andeither of the stationary contacts. This may be accomplished by raising the handle until the core moves by gravity to its forward position, Fig. l, in which the contact 29 is in engagement with the movable contact-ring 27. Therefore when the circuit is closed the current first travels in the circuit formed through the retracting solenoid 6 and is then switched into the circuit formed through the Working solenoid 5, which causes the core to give a hammer-blow upon the tool-stock. This arrangement of the working solenoid in advance of the retracting solenoid is not absolutely necessary, however, and may be IIO changed, if desired, and many other changes in the form and proportion of parts and details of construction may be made without departing from the spirit or sacrificing the advantages of our invention. We prefer to make the core, the cylinders 10 11, and the disks 12 of soft iron, the tool-stock of toolsteel, the cap, the sleeves, the hammer-head, the cylinder 13, and the head and handle of bronze, and the contacts of brass; but we do not confine ourselves to the use of these particular materials, as others may be substituted whenever desired and when equivalent results can be obtained. lVe may also use any suitable insulating material, and the wires are insulated and arranged in the apparatus in a manner which is most convenient.

The apparatus constructed in accordance with this invention can be used with a great many different kinds of machine-toolssuch as a hammer, a dental mallet, a chisel, a drill, a saw, a file, &c.--in fact, with any tool which can be operated by a reciprocating motion. One of the most important features of the invention is that the apparatus, although of very small compass, is capable of producing unusual results by reason of the rapidity of its action. By reciprocating the core at a high rate of speed we are able to accomplish with an apparatus comparatively light in weight and small in compass far superior results to much heavier and larger apparatus, which depend upon the force of each blow delivered slowly for its effect.

We secure the greatest possible efficiency from the electric current by employing the magnetic inclosing shields for the coils,which result in reducing the air-gap, confining the magnetic field, and concentrating the lines of force directly upon the core and securing their full effect at the point where they are to be used.

The non-magnetic parts of the apparatus may be made of aluminium, and other means than the screw-threads maybe employed for securing the parts together.

Having thus fully described our invention, what we claim, and desire to secure by Letters Patent, is

1. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids and to communicate a succession of blows to a tool, and independent and separated magnetic shields for said solenoids to concentrate the lines of force on the core, substantially as described.

2. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids and communicate a succession of blows to a tool, said core being magnetically insulated from the solenoids, and independent and separated magnetic shields for said solenoids to reduce the air-gap and concentrate the lines of force on the core, substantially as described.

3. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized,

of a magnetic core arranged to be reciprocated by and through said solenoids, a non magnetic sleeve between the core and each solenoid, and magnetic shields around the solenoids and insulated from each other, substantially as described.

4. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, a magnetic shield surrounding each solenoid and a non-magnetic connection between the shields, substantially as described.

5. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, a magnetic shield around each solenoid, and a non-magnetic cylinder forming a connection between the shields, substantially as described.

(3. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, and electric circuits for alternately energizing the same, of removable contact connections in the circuit leading to one of the solenoids and arranged between said solenoids to engage terminals on the adjacent heads thereof for making permanent electrical connections between the two solenoi( s, substantially as described.

7. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids and electric circuits for alternately energizing the same, of removable contact connections in the circuit leading to one of the solenoids and consisting of spring-metal devices arranged between said solenoids and engaging terminals on the adjacent heads thereof for making permanent electrical connections between the two solenoids, substantially as described.

8. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be operated by and through said solenoids, electric circuits for alternately energizing the solenoids, a non-magnetic mechanical connection between the solenoids and removable electric connections in the circuit leading to one solenoid and engaging the terminals thereof for making permanent electrical connections between the two solenoids and carried by the mechanical connection between the solenoids, substantially as described.

9. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids,of a magnetic core arranged to be re ciprocated by and through said solenoids, a magnetic shield around each solenoid, a nonmagnetic connection between the shields, electric circuits for alternately energizing said solenoids and electric connections in the circuit leading to one solenoid carried by the non-magnetic connection between the shields and consisting of spring contact-fingers engaging terminals on the adjacent heads of the solenoids, and adapted to be removed with the non-magnetic connection, substantially as described.

10. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids and a magnetic core adapted to be reciprocated thereby, of curved contacts on the adjacent ends of the solenoids, a nonmagnetic connection between the solenoids and contact devices carried by said non-magnetic connection and arranged to engage the curved contactson the solenoids, substantially as described.

11. In an electrical apparatus foroperating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids and provided with a hollow or recessed section and a circuit maker and breaker at said hollow or recessed section, substantially as described.

12. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, said core being recessed or hollow at one end thereof, substantially as described.

13. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, said core comprising a solid section and a hollow end section, and a circuit maker and breaker at said hollow end section, substantially as described.

14. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, said core consisting of a solid section and a tubular section connected with said solid section, and a circuit maker and breaker at said tubular section, substantially as described.

15. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core arranged to be reciprocated by and through said solenoids and having a recessed or hollow section, and a switch device operating in the hollow section of the core for switching the current alternately through the solenoids, substantially as described.

16. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, ot' a magnetic core adapted. to be reciprocated by and through said solenoids and having a recessed or hollow section, a movable contact carried by the hollow section of the core and stationary contacts arranged to be alternately engaged with said movable contact as the core is reciprocated for switching the current alternately through the solenoids, substantially as described.

17. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be reciprocated by and through said solenoids, a tubular contact device carried by said core, and stationary contacts arranged within said tubular contact and adapted to engage therewith alternately as the core reciprocates to switch the current alternately through the solenoids, substantially as described.

18. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be reciprocated by and through said solenoids, a tubular contact device carried by said core and partly insulated interiorly, and stationary contact devices arranged within the tubular movable contact device and adapted to engage therewith to switch the current alternately through the solenoids, substantially as described.

19. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be reciprocated by and through the solenoids, a tubular contact device carried by the core, and an adjustable stationary contact device arranged to engage with said movable tubular device, substantially as described.

20. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be reciprocated by and through said solenoids, a tubular contact device carried by the core, a fixed stationary contact arranged to engage with the movable contact and a stationary longitudin ally-adj ustable contact arranged to engage with the movable contact as the latter reciprocates and adapted to be adjusted to limit the reciprocating movement of the core, substantially as described.

21. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be reciprocated by and throughthe solenoids, a tubular contact device partly insulated interiorly and carried by the core, a fixed contact device arranged within the tubular movable contact to engage therewith, an adjustable stationary contact also arranged within the tubular movable contact, and means for holding the said'adjustable contact from revolving while it is being adjusted longitudinally, substantially as described.

22. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be reciprocated by and through said solenoids, a tubular movable contact device partly insulated interiorly and carried by the core, a stationary contact 29 arranged to engage with the movable contact, a stationary contact 30 and a supporting-rod for said latter contact provided with a threaded end to receive the contact,whereby said contact may be adjusted longitudinally by rotating the rod, substantially as described.

23. In an electrical apparatus for operating 29. In an electrical apparatus [or operating a tool, the combination with a pair of alined a tool, the combination with a pair of alined solenoids, of a magnetic core adapted to be re ciprocated by and through said solenoids and having a recessed or hollow end section, a tubular contact device secured in the hollow end of the core and reciprocating therewith, and stationary contacts arranged within the tubular movable contact and adapted to engage therewith, substantially as described.

24. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids and having a recessed or hollow end section, a tubular contact device secured in the hollow end of the core and reciprocating therewith, a contact 29, a support for said contact, an insulated plate arranged within the tubular movable contact and above the support for the contact 29, a contact 30 resting upon said insulating-plate,a supporting-rod having a threaded end to receive the contact 30 and its other end projecting through the apparatus and adapted to be rotated to adjust the contact 30 on the end thereof longitudinally, substantially as described.

25. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arran ged to be reciprocated by and through said solenoids, a non-magnetic connection between the solenoids, a cap arranged at one end of the apparatus, and a tool-holder supported by said cap, substantially as described.

26. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, a cap at one end of the apparatus, a sleeve secured in said cap and adapted to receive the core, and a tool-holder movably carried by the cap and adapted to be operated by the core, substantially as described. I

27. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of amagnetic core arranged to be reciprocated by and through said solenoids, a hollow headpiece arranged at one end of the apparatus, and a circuit-closer device arranged in said hollow headpiece and adapted to be operated from the outside thereof to close the circuit and start the apparatus in operation, substantially as described.

28. In an electrical apparatus for operating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, a hollow headpiece, contacts 44, 45 located within said hollow headpiece, and a circuit-closer operating through the headpiece and adapted to engage said contacts, substantially as described.

solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, a hollow headpiece at one end of the apparatus, contacts ll, 45 arranged within said headpiece, a circuit-closer for engaging said contacts, curved contact devices 54:, 57 and contact- fingers 55, 56, substantially as and for the purpose described.

30. In an electrical apparatus foroperating a tool, the combination with a pair of alined solenoids adapted to be alternately energized, of a magnetic core arranged to be reciprocated by and through said solenoids, a magnetic shield around each solenoid, a non-magnetic connection between the shielded solenoids, a cap connected to the outer end of one of said shields and a headpiece connected to the outer end of the other shield, substantially as described.

31. An electrical apparatus foroperatinga tool, comprising a pair of alined solenoids adapted to be alternately energized, a magnetic core arranged to be reciprocated by said solenoids, a cylindrical magnetic shield inclosing each solenoid, a cylindrical non-magnetic connection between the shields, a cap at the outer end of one shield, ahollowheadpiece at the outer end of the other shield and a handle carried by said headpiece, substantially as described.

32. An electrical apparatus for operating a tool, comprising a pair of alined solenoids adapted to be alternately energized, a magnetic core arranged to be reciprocated by said solenoids, a magnetic shield inclosing each solenoid and concentrating the lines of force on the core, a non-magnetic connection between the solenoids, a hollow headpiece, contact devices arranged within said headpiece and a switch device carried by the core, substantially as described.

33. An electrical apparatus for operating a tool, consisting of a body comprising a non magnetic cylinder, a shielded solenoid connected to each end of said cylinder, a magnetic core, electric circuits for alternately energizing the solenoids to reciprocate the core, a hollow headpiece, a handle connected to said headpiece and a switch device carried by the core and operating in the hollow headpiece, substantially as described.

31-. The combination with a core for operating a tool and means for actuating the core, of an inclosing casing comprising a central cylinderhaving annular shoulders 14,15 therein, and cylinders 10, 11 arranged in the ends of the central cylinder and abutting against the shoulders therein, substantially as described.

35. An electrical apparatus for operating a tool, consisting of a body comprising two solenoids each of which is provided with a magnetic shield inclosing its ends and outer surface, a non-1n agnetic connection between said solenoids to maintain them in proper alinement, electrical circuits for alternately ener gizing said solenoids, and a magnetic core adapted to be reciprocated by the solenoids, substantially as described.

36. The combination with a core and means for reciprocating the sa1ne,of an inclosing casing comprising a central cylinder, a cap, a headpiece having a handle, and cylinders arranged between the central cylinder and cap 10 and the headpiece and central cylinder and all connected together, substantially as described.

CHARLES E. MOORE. CHARLES J. REILLY.

Vi tnesses:

W. M. SIMPSON, WM. 0. BELT.

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