US1377562A

US1377562A - Electkic habimeb

Info

Publication number: US1377562A
Authority: US
Publication date: 1921-05-10
Anticipated expiration: 1938-05-10

Description

F. w. DAVEY.

-ELECTFHC HAMMER.

APPLICATION HLED SFPTl 19, 1919.

Patented May 10', 1921.

SNN

, UNITED STATES "FREDERICK W.1DAVEY, or BROOKLYN, NEWfYoRK.

To all whom it magz/ concern.'

PATENT OFFICE.

ELECTRIC Heini/IER.l f

Ble; it known that I, FREDERICK W. DAVEY, acitizen of the United States, residinofin Brooklyn, inthe county of Kings and tate rof New York, have'invented certain new and useful Improvements in Electric Ham mers, of which the following isa specication. 1

This invention relates to Yelectric harnmers of the type in which the hammer' or plunger'memher is reciprocated byv means of electric solenoids which are alternately energized for drawing the reciprocating member back and forth. f

kas the description proceeds; and while herein minute details of theinventionv are'described, vthe invention is not limited to these, j since many and various changes maybe `nism is shown in connection with an elec- The objects of the invention are to provide an eilicient arrangement for reciprocating the hammer member, and vto provide j means for moving the lhammer member from neutral position during the starting of the loperation thereof. l'

Anotherobjcct is to provide an arrangement whereby the reciprocating` member will be prevented from becoming permanently maonetized. l

ther objects of the invention will appear lmade without departing from the scope of the, invention as claimed. l

` In the accompanying drawing, showing by way of example, one of many possible embodiments of the invention,-

Figure 1 isa central longitudinal Asectional viewy showing the operating and controlling mechanisms ofthe hammer;

Fig. 2 is' a sectional view taken on the line A-Bof Fig.` 1; E

Fig. 3 is'fragmental perspective view of the yreciprocating plunger/member; and j Fig. l is a fragmental elevation', partly in section, showing 'a detail of vthe hammer starting, switch.

` Vhil'e my improved reciprocating mechatric hammer, itis understood that itV may be used in connection with many otherldevices in which a member has to be reciprocated.

yIn the'present instance, the reciprocating 'mechanism is shown embodied yin an electrical hammerprovided' with a cylindrical casing 5in the forward end of which is secured a forward head vvo' provided with an axial guide bore 7. ,In .the rear of said casing there is secured a rear head 8 provided with Specication of letters Patent. Patented lay 10, 19 2L Application filed September 19, y1919. Serial No. 324,755. v' y va handle 9. In said guide bore 7 there is loosely received the reduced end 10 of atool Vspindle 11, said reduced end projecting into the casing chamber formed by said cylindrical ycasing and head;

Intermediately of said chamber ythere is' disposed ka disk 12 of tough insulating material yprovided with an angular central opening 13 (Fig. 2), and a plurality oi ra- .dial `bores 14e' connecting' with said central opening and disposed at right angles to each other... Said disk is held in place between a plurality of lugs 16 by screws 17 passing from the outside through said 4lugs and into ythe disk. g

A guide tube 19 of bronze or other desired f non-magnetic material andof square internal cross-section passes through said angular opening and terminatesnear said head. Forward and rear solenoids'20 and 21 are disposed on said tuhe against said disk and are wound and connected up so as to have their like' poles adjacent,A for instance as shown, thev letters S placed near the inner end of keach solenoid, and the`letters N placed near the outer ends of the solenoids indicating that these may be eithernorth 'or 'south' poles respectively. The object of this will be presently explained'. End disks 22 placed near the endsy ofthe guidetube hold thesolenoids in place.

A rubber buffer 24 is disposed within said guide tube 19 against the rear head 9; and within said tube, between said buffer andthe 'tool spindle 1l, there isslidably disposed a reciprocating member or plunger-26 (Fig.

Vopenings 'are contact plates 31 held in place by meansoi` front and rear rivets 32 and 33 passing through said transverse Aopenings and said contacts and electrically connected contacts of each pair witheach other.

In each of said radial openingf's'lllk there is slidably disposed a carbonlbrush 34.- (Fig. 2), adapted to pass through the openings 35 in the'tube 19 and engage said contactplates 3l. Each brush is provided with a contact stem 36 projecting'at the outer ends of the radial bore. A screw plug 38 closes 'the outer end of each radial bore and is provided with a central perforation through which said stem passes. A helical spring v39 Vcompressed between the f/plug and brush posed in the outer end of said switch receiving bore, and is held in place by means of a shoulder screw plug 43 11i-the outer end of said bore and having a vlarge central ope-ning through which passes ,a push-but-v ton 50 provided with aflange engaging the inner face of said shoulder plug to prevent the entire removal of the button.v A switch blade 52 screwed to said button passes through aslot in the central wall of said cup and is adapted when the buttonV is pressed inwardly against the action'of the Y spring 53 to engage between and electrically connect said spring contacts 45 and 46.

An insulating block 55 is mounted across the interior of saidV bore and has mounted thereon a conducting piece 56 connected by means of the main conductor 57 to aterminal 56 engaged by nuts 5901i the end of the stem 36 of one of the brushes. A branch. conductor 6l connects said main conductor with the stem 36 of one of the adjacent brushes.

The other brushes opposite to Y said adjacent brushesare connected respectively by means of conductors 62 and 63 to one end of the front and rear. solenoids 20- and`2l in such manner that the rearvcontact plates may be electrically connected with the rear solenoidswhen the plungergoes forward as shown in Fig. l, and the forward contact plates may be electrically connected with the forward solenoid when the plunger moves to the rear.' Conductors 65 connect the other ends of the solenoid wireswith the spring contact 46; and a conducting member 6r connects the other contact kmember 45 with one terminal of a source ofcurrent 7 0,-the other terminal of which source is connected by means of a conductor 7l with said conducting plate 56.

`From the aboveit will be seen that when the plunger is in the forward position as indicated in Fig. l, and the button 50 is pressed by the hand of the operator', the current passes from the source of current through the conductor 7l, the conducting piece 56, the main conductor 57, brush 34, the rear connecting rivet 33, the opposite brush 34,

the conductor 63, the solenoid 2l, the conductor 65, the spring contact 46, the switch blade 52, the other contact 45, and the conductor y67 to the other terminal of the source of current; This causes the current to energize Vthe rear solenoid 2l whereupon the plunger 26 is drawn to its rearmost position, and the forward rivet 32 is brought into contact with the brush 34 so that the current passes through the branch conductor 61, and the conductor 62, and the forward solenoid 20, thus energizing the forward solenoid and carrying the plunger forward to strike' the tool spindle l1 to operate the tool. This operation is then continued so long as the button 50 is pressed. f Y

As was noted, the solenoids 20 and 21 are wound to have their like poles adjacent, and therefore their magnetic flux flowing in Vopposite directions, The plunger 26, there- 1the* plunger from becoming permanently mavnetizedfin either direction' and in this way one avoids the disadvantage of having Vthe plunger to adhere too strongly to the tool spindle when in the position of Fig; 1.

It sometimes happens, particularly when the hammer is placed in horizont-al position that the plunger disposes itself at a midposition so that neither rivet 32 nor 33 is in registration with the brushes, thereby preventing the passage ofany current through the solenoid coils. ,p l

In order surely to move ythe plunger to one of its limitsof movementiwhilestill holding the hammer in horizontalV position, I have provided the following starting means: A transverse switch receiving recess 75 (Fig. 4), formed inthe forward part of the handle 9, is provided with an'insulating bushing 76 andhas disposed therein a pair of springv contacts 7 7v and 7 S mou-nted upon an insulatingsupport 79. n An independent startingA coil, wound with the solenoid coil 2 1, but entirely electricallyindependent therefrom, has one of its ends 8l electri- (Fig. 4), secured to the starting button 86 v is pressed inwardly, by the operatorsithumb,

against the action of the spring 87,V it wil-l electricallyl connect said Contact members 77 `and 73, thus causing the flow of currentl through the conductor 71,' the conducting piece56,`the main conductor `57, the end 81., i

the starting coil, the otheriendr82. of `the starting "coil, the switch `members V77 and 73, and the conductors 83 and 67, thereby lcompleting al circuit through the starting coil drawing the plunger to its rearmostv position whereupon a circuit .is established through the forward rivet 32', whereupon,

after the starting button is released, the

plunger reciprocates as explained before. I claim: f

' 1. EIn combination, a plunger reciprocat` ablewithinlimits, solenoid means for reciprocating said plunger and meansfor moving the plunger when in a neutral position between said limits for reciprocation by said solenoid means.v y vo f 2. Incombination, a plunger reciprocatablewithin limits; solenoid means for reciprocating the plunger; and meansindependent of the solenoid means for moving the plunger when in a neutral position between said limits for reciprocation by said solenoid means. y y u 3. In combination, .rco-axial. solenoids; a plunger reciprocatable by ysaid solenoids in the solenoids and within limits means for alternately energizing the solenoids; and means for moving the plunger when in a -neutral position between said limits for reciprocation by'said solenoids.

4.' In`r combination, co-axial solenoids; a plunger reciprocatable by said solenoids in the solenoids and'vwithin limits gwmeans for alternately energizing the solenoids; means `independent of said solenoidsI for moving `the plunger when in aneutral position between said limits forreciprocatron by said solenoids and electrically independent therej from.

6. rIn combination, a pair of co-axial solenoids; a plunger reciprocatable by said solenoids in the solenoids and within limits; means for alternately energizing the solenoids; means independent of said solenoids for moving the plunger when in a neutral position between said limits for reciprocation by said solenoids; means for energizing said independent means; and means for o erating said independent means; said in ependent means comprising a coil wound with one of said solenoids and electrically independent therefrom.

7. In combination, forward and rearward solenoids; a plunger reciprocatory by said solenoids; means controlled by the plunger for energizing the solenoids when the plunger moves to one limit or the other;

and separately controlled means `for energizingonesolenoid when the plunger vis between limits." f

8. 'In combination, forward and rearward solenoids; a plungerreciprocatable iin said solenoids; insulating means around said` plunger; conducting means passing through saidfplunger; brushes forvcontacting with said nconducting means; a main conductor connected to adjacentbrushes; conductors connecting the remaining?` brushes with one end of said frontk and rear solenoids respectively,-in such manner that thek forward solenoidis electrically connected tor said main conductor when the plunger is in rearposition andthe rearward solenoid is connected yto the main conductor when the plunger is in forward position; additional conductors connected to the otherv ends of Lsaid solenoids; and a source of current having one -terminal connectedto the additional conductorsand its other terminal connected to'said main conductor. l f' 9. In combination, forward and rearward solenoids; a plunger reciprocatory in.- said solenoids; 'insulatingy means". around said plunger` and carriedL thereby; conducting members passing transversely throughv saidk plunger; brushes yieldably held inposition n to `contact ,saidj conductingmembers ay main conductor connected to adjacent brushes; yconductors yconnecting' the 'otherbrushes with one end of` said front and rear solenoids respectively, in such manner that the front Vsolenoid is electrically connectedv to' said main conductor Whenthe plunger is; in rear position and the rear solenoid is connected to the main Lconductor `when the plunger is in` forward position; additional'v conductors 'connected to the `other yends of said `solenoids; and a source of current having one terminal connected to the additional conductors and its other terminal connected to said main conductor. y n

10. In combination, forward and rearward solenoids; a plunger reciprocatory by said solenoids; forward and rear conducting members passing through said plunger and arranged in staggered relation to eachk ioo iio

other; brushes held in positionto contact opposite ends of said conducting members; a main conductor connected to adjacent brushes; conductors connecting the other brushes with one end of the wires of said front andrear solenoids respectively, in such when the plunger is in forward position; y

additional conductors connected to the other ends of said solenoids; and a source of current having one terminal connected to the additional conductors and its other terminal connected to said main conductor. j

11. In combination` forward and rear soleiioids; a plunger reciprocatory vbylsaid solenoids; forward and rear conducting members passing transversely through said plunger and arranged in staggered relation to each other; brushes between said solenoids and yieldably held in position to contact said conducting members; a main conductor connected to adjacent brushes; conductors connecting the other brushes with one end of the wires of .said front and rear solenoids respectively, in such manner that the front solenoid is electrically connected .to said main conductor when the plunger is in rear position and the rear solenoid is 4connected 4to the main conductor when the plungergis in forward position; additionalconductors connected to theother ends of said'solenoids; and a source of current having one terminal connected to the additionalcon- `held'against rotation thereing. forward and rear conducting rivets passing transversely through said plunger and arranged 1n staggered relation to each other pairs of brushes varranged between said solenoid, one pair to each rivet, and yieldably held-in position to contact the opposite ends of said rivetsgia main *conductor connectedl to` one brush of each pair; conductors connecting the other brushes with one end of said front and rear solenoidsrespectively, in such manner that the Vfront VsolenoidV is electricallyconnected to said main Vconductor when the plunger is in rearposition andthe rear f solenoidis connected to they main conductor when the plunger vis in forwardposition; ad-

Y additional conductors and its other terminaly connectedto said main conductor.

13. In combination, a .disk of insulating material provided with ycentral opening and radial bores; a guide tube of anguilar in- `ternal` cross-section passing through said opening;v forward and rear solenoids disposed on said tube against said disk; aplunyger ofi angular ciiosssection slidable in said tube, forward and rear conducting rivets Apassing transversely through said plunger and arranged in staggered relation to'each other and 'adapted to come in'register with said radialbores; an insulating bushing cov- Hering ysaid plunger; brushes slidablein said radialfbores and'yieldably` held in position `to contact said rivets ;V a main conductor con- -nected to adjacent brushes conductors connecting the other brushes with one endof i ,saidfrontand rear solenoids respectively, in :such manner thatthe. front solenoid is electrically connected tosaid main conductor when theplunger is-inrear position and the V'rear solenoid is connected to the main lcon- -ductoriwheny the Aplunger is inforwardposi- L Y"tion additional conductors connected to the other ends of said solenoids; and asourceof currenty having one terminal connected to thefadditional conductors and itsotherA terv V-minal connected to 'said main conductor.

FREDERICK W. DAVEY..A WVitnesses: i H. D. Pennisi', Y Y

H. M. Kinrn'riiioin e