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Publication numberUS2083168 A
Publication typeGrant
Publication dateJun 8, 1937
Filing dateDec 26, 1935
Priority dateDec 26, 1935
Publication numberUS 2083168 A, US 2083168A, US-A-2083168, US2083168 A, US2083168A
InventorsEdward Larson
Original AssigneeH F Connelly, J R Sibbald, William Rast
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric forging hammer
US 2083168 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

June 8, 1937. E. LARSON ELECTRIC FORGING HAMMER Filed Deb. 26, 1935 3 Sheets-Sheet l Invenlor E. Zea/J0 A Hamel) June 8, 1937. LARSON 2,083,18 ELECTRIC FORGING HAMMER I I Filed Dec. 26, 1955 a Sheets-Sheet 2 l I l A ilomey June 8, 1937. E, L RS 2,083,168

ELECTRIC FORGI NG HAMMER Filed Dec. 26, 1935 3 Sheets-Sheet 3 Inventor A llorney Patentedlune 8, 1937 UNlTED sTArss ELECTRIC FORGING HAMMER Edward Larson, Austin, Nev., assignor of onefourth to H. F. Connelly, one-fourth to William East, and one-fourth to J. B. Sibbald,

Austin, Nev.

Application December 26, 1935, Serial No. 56,275

1 Claim.

My invention relates generally to electric hammer means, and particularly to an electric-magnetically operated forging hammer, and an important object of the invention is to provide a simple, rugged, and efficient device of this character which can be produced and operated at relatively low cost.

Another important object of the invention is to provide a mechanically efficient arrangement of the character indicated above in which the parts are easily accessible for repair or replacement.

Other important objects of my invention will be apparent from a reading of the following description in connection with the drawings, wherein for purposes of illustration I have shown a preferred embodiment of my invention.

In the drawings:-

Figure 1 is a general diagrammatic representa tion of the electric wiring and connections of the embodiment.

Figure 2 is a side elevational View of the embodiment.

Figure 3 is a transverse vertical sectional view taken through Figure 2 and looking from left to right.

Figure 4 is a side elevational view of the tube and its supports and flanges.

Figure 5 is a side elevational view of the piston or core and the hammer.

Figure 6 is a transverse vertical sectional view taken through the core.

Figure 7 is a transverse vertical sectional View taken through the hammer.

Figure 8 is a plan view of the manual operating lever or switch.

Referring in detail to the drawings, the letter A generally designates the upper coil and the letter B the lower coil of the piston operating 40 assembly. For six to eight volts operation these coils are wound with No, 10 gauge wire. These coils are wound on a brass hollow cylinder I in which works the piston or core 4 which is made preferably of steel tubing and has screwed into its opposite ends the solid magnetically permeable heads 2 and 3.

The lower end 3 is axially threaded to receive the upper end of the piston rod 5 whereby the piston is operatively connected to the piston 4.

59 The rod 5 is preferably of steel and has its lower end threaded as indicated in the top of the hammer 6 which is or" steel.

The hammer operates in conjunction with the anvil l which is preferably a steel block and 55 has wound thereon the coil C which is wound to give anvil l the same magnetic effect as the hammer 6, so as to make the anvil neutral so that the magnetized hammer will not stick to it. The coil C is a tandem wound coil and comes into action at the same time that the coil A. 5

The numeral 9 generally designates a manually operating lever or switch lever which is pivotally mounted as indicated by the numeral 9 to a suitable support.

The numeral ill designates the contact point 10 which is connected to the wire 15 which leads to the inside winding of the coil A, and this contact is also connected to the wire I! which leads to the coil C.

The numeral H designates the contact point 15 which is connected to the wire it which leads to the inside winding of the coil C.

The numerals l2 and i2 designate the contact points on the lever 9 which engage respectively the contact points 10 and H. 20

The wire 14 leads from the contact l2, l2 to the negative post on an energizing battery such as a storage battery. The wire l3 leads from the two outside windings oi the coils A and B to the positive post on the battery, while the 25 wire it leads from the coil C to the wire 13.

Referring particularly to Figure i, there istherein shown. the brass cylinder 1 with the brass flanges 20, 2| and 22, the flanges 25] and 22 acting as brackets to fasten the coils to the 30 support 23 as shown in Figure 2 and the brass flange 2i acting as a separator between the coils A and C.

To operate the device of the invention, the lever 9 is raised so as to bring the contact points I2 and [0 into contact so as to cause electric current to flow from the battery through the coils A and C, thereby making the anvil neutral to the hammer and causing a strong magnetic attraction in the coil A, so as to cause the piston to be drawn upwardly into a position in which the upper end of the core or piston is above the tube. By moving the lever downwardly so as to engage the contact i2 with the contact H, elec tric current is caused to flow from the battery through the coil B. which causes a strong magnetic attraction, following the lapse of the attraction in the cell A, so that the piston is drawn downwardly so that the hammer is forced downwardly with a striking blow toward the anvil. These operations can be performed almost as quickly as a person can manipulate the lever 9 up and down by hand.

Although I have shown and described herein a preferred embodiment of my invention, it is to be with said hammer head, an electrical winding surrounding said anvil, a source of electrical supply, a switch, said source of electrical supply and said switch being included in circuit with the windings of the solenoids for selectively energizing said windings for effecting a reciprocating movement of said armature, and said Winding of the anvil being connected in circuit with said source of supply and said switch and adapted to be energized simultaneously with the energiza- 10 tion of one of the windings of the solenoids.


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US3303682 *Feb 1, 1962Feb 14, 1967Gen Motors CorpMethod and apparatus for cold forming toothed elements
US5154075 *Jul 2, 1991Oct 13, 1992Coors Brewing CompanyCan body maker with magnetic ram bearing and domer
US5231747 *Dec 21, 1990Aug 3, 1993The Boeing CompanyDrill/rivet device
US5257523 *Jul 13, 1992Nov 2, 1993Coors Brewing CompanyCan body maker with magnetic ram bearing and redraw actuator
US5263236 *Jan 10, 1992Nov 23, 1993The Boeing CompanyDrill quill bearing assembly
US5404633 *Jan 10, 1992Apr 11, 1995The Boeing CompanyMethod of dynamically supporting a drill quill in a drill/rivet machine
US5471865 *Sep 9, 1993Dec 5, 1995Gemcor Engineering Corp.High energy impact riveting apparatus and method
US5575166 *Jun 7, 1995Nov 19, 1996Gemcor Engineering Corp.High energy impact riveting apparatus and method
US5577315 *Jun 6, 1995Nov 26, 1996The Boeing CompanyMethod of upsetting rivets
US5621963 *Jun 6, 1995Apr 22, 1997The Boeing CompanyDifferential capacitance in an electromagnetic riveter
US5685058 *Jun 6, 1995Nov 11, 1997The Boeing CompanyMethod for direct insertion of a headed rivet into a countersunk hole
US5752306 *Jun 6, 1995May 19, 1998The Boeing CompanyMethod for upsetting a headed rivet by differential initiation of opposed electromagnetic rivet drivers
US20040025313 *Aug 6, 2002Feb 12, 2004Dowell David H.Synchronized rivet gun system
U.S. Classification310/35, 72/430, 335/274, 310/30, 335/255, 335/282
International ClassificationH02K33/00, H02K33/12
Cooperative ClassificationH02K33/12
European ClassificationH02K33/12