US1503973A - Terminal-setting tool - Google Patents

Description

9:? Aug 5 1924 E. BERGMAN a TERMINAL SETTIEG TOOL Filed July 11, 192:: 2 Shasta-Sheet '2 v A TTORNEYJ Patented Aug. 5, 1924.

UNITED STATES EDWARD BERGMAN, on NEW YORK, N. Y., ASSIGNOR '110 0. BRANDES, Inc., A

1 -'1IO1\T on NEW YORK.

conrona- TERMINAL-SETTING TOOL.

Application filed July 11, 1922. Serial No. 574,253.

To all whom it may concern:

Be it known that I, EDWARD BERGMAN, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Terminal-Setting Tools; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. f r

This invention relates in general to punch press tools andis directed more particularly to a tool which is specially adapted for attaching soldering terminals to spool heads of telephone receivers.

In the co-pending application of Frederick Dietrich and Edward Bergman, Serial No. 567,928, filed June 13, 1922, there is disclosed a telephone receiver in which the magnet spool heads are provided with inserted soldering terminals,-by' virtue of which the heavy wire leads, which in pre-- vious practice were conneotedto the ends of the fine wire windings, are eliminated.

The present invention has for'its object the provision of a tool for attaching soldering terminals to electro-magnet spool'heads and the like, such as is described in the aforementioned co-pending application, which may be operated by unskilled labor, and having an output capacity commensurate with economical manufacturing.

The preferred embodimentv of the invention, which willgbedescribedmore in ,de-. tail hereinafter, is a punch and die' structure in which the die is provided with a yieldable member adapted for receiving the spool head blank and for properly positioning the latter thereon. The spool-head blank has a slot extending inwardly from its edge at each end portionand the punch and yieldable member are each" provided with hardened steel lugs whichregisten with the slots in the blank. 'A'pair of guidesare provided on the die through which metal strips or wires are fed into the slots. in the blank and a pair. of cams are provided which permit the metal strips or wires to move in one direction, but prevent retrograde movement thereof. With a spool head blank positioned on the yieldable member, the operator pushes the metal strips or wires through the guides into the slots in the blank. after which. the punch is. brought down and the ends of the metal stripsare compressed between the hardened steel lugs and forced laterally into engagement with the sldes of the slots in the blank. Simultaneously with the pressing operation just described, the metal strips. are sheared off, between cutting. edges on the punch and die to the proper length to form suitable soldering terminals. These terminals, by reason of the pressing operation, are firmly secured in the slots of the spool head blank.

The completed spool head is then removed by the operator and another blank placed in the tool. As will be seen, a single stroke of the punch completes the entire operation above described.

For a more complete description of thetool and its operation, reference will now behad to the accompanying drawings in which,

Fig. 1 is an elevation, partly in crosssection, of the assembledtool;

i Fig. 2 is a fragmentary cross-sectional view on a reduced scale taken along the line 22 of Fig. 1; v

Fig. 3 is a plan view of the die (the punch being omitted from this view) Fig. 4 is an enlarged cross-sectional detail view of the punch and die taken along the line H of Fig. 3 and illustrates a partly completed operation of the tool;

Fig. 5 is the same as Fig. 4: except that the punch is shown in its most advanced position;

Fig. 6 is a view "of the face of the yieldable member forming that part of the die which registers with the punch;

1 Figs. 7 and S are elevational views of the end of the yieldable member shown in Fig. 6; i

. Fig. 9 is a plan view of an assembled spool head includin a pair of soldering terminals; and, V

Fig. 10 is a view of a telephone receiver electroniagnet embodying a pair of spool heads such as is shown in Fig. 9.

The bedplate 1, shown:in Figs. 1, 2and 3, is arranged to be secured to the .bed 2 of a punch press. A die plate 3, preferably of tool steel, is secured to the bed plate 1 by means of screws 5 and dowel pins 6. The member 7, also preferably of tool steel, is mounted in a recess in the center of the die plate 3. The face of the member 7 is provided with a central rectangular lug 7 and a pair of specially shaped lugs 2 and 7 3 as is shown very clearly in Figs. 6, 7 and 8. A pair ofpins 8, as shown most clearly in Fig. 2, extend from the bottom of the member 7 through suitable apertures provided in the die plate 3 and bed plate 1 and their lower ends bear against a: metal washer 9 on the end of a resilient rubber bufier 10. The latter is supported by the bolt 12 and nuts 13. Bolt 12 is threaded into the bed plate 1 as shown in Figs. 1 and 2. In Fig. 1 the member 7 is shown'in its normal position wherein its upper face is nearly flush with the face of the die plate 3.

In Fig. 3 a spool head blank 11 is shown positioned on the face of the 'member 7.

The lug 7 is proportioned to fit closely the slot 11 in the blank 11 and the contour of the yieldable member, as shown in F ig. 6, conforms closely to the general outline of the spool head blank 11. Lugs 7 and 7 on the member 7 are so proportioned that they -may be readily inserted into corres onding slots in the spool head blanks.

n the face ofthe die plate 3 there is provided a pair of lugs 12 having apertures 13 which register with the slots in the spool head blank into which the terminals are to be inserted. These lugs and their apertures constitute guides for the metal strips or wires 14 and the apertures 13 are of suitable shape and size to permit the metal strips 14 to move freely therethrough. In Fig. 3 the metal strips 14 are shown with their ends projecting into the slots in the spool head blank which is shown mounted on the member 7 wherein the operation of compressing and cutting off the metal strips to form terminals is ready to be executed. The metal strips 14 are fedinto the tool by hand and in order to prevent retrograde movement thereof a pair of cams 15 is provided each of which is pivotally mounted in a bearing member 16, as shown in Figs. 1 and 3. It will be seen that, due to the shape of the cams '15, the metal strips 14 may be readily moved, each in one direction, and that the cams will operate as ratchets to prevent retrograde movement thereof, unless the operator intentionally holds the cam in an on" normal position in order to remove the metal strips from the tool. The

punch 17, which is preferably of tool steel,

has a face which corresponds with the face of the member 7 as shown in F ig; 6, except that it is not necessary tov provide a lug 7 on the face, of the punch. There are, however, .lugs on the face of the punch cor* responding with lugs 7 2 and 7 and it is between these pairs of lugsthat the metal strip is compressed and thereby forced into engagement with the sides of the slots in the spool head blanks.

-. The punch '17 is inserted in, and carried by, the shank 18" whiclnin turn, is secured in the usual manner in the; tool head of a pins 20 are slidably fitted. Theguide pins,

20 and yoke 19 maintain the punch and die ,in proper alignment.

The operation of setting a terminal in a spool; head blank is quite clearly illustrated in Figs. 4 and 5. In Fig. 4 the operation is partially completed and the end portion of the metal strip which forms the terminal is shown partially compressed between lug 7 of the member 7 and the corresponding lug 17 of-the punch 17. In Fig.5 the com; pressionandshearing of the metal strip is completed. It will be noted that the memher 7 movesdownwardly under the pressure applied through the punch 17, and as will be evident, the rubberbufi'er' 10 is pressed during this operation. Instead of the rubber buffer 10 a heavy steel spring can be em-- ployed.

Fig. 9 illustrates quite clearly the appearance of the. soldering terminals in a spool head blank after the above described operation. In the illustration of Fig. 10 each of the electro-magnet bobbins includes one spool head such as that of Fig. '9. The upper terminals are arranged to abut as shown and are soldered together in the assembly. The fine wire with which the magnets are wound are connecteddirectly to thesoldering terminals, thus eliminating heavy wire leads as is clearly explained in the aforementioned co-pending application. I I e While the specific embodiment of the invention herein described is limited in its utilityto a particular form of spool head,

it willbe quite obvious that the invention isnot limited to any particular form of spool headpnor in fact, is it limited in its applicability evenjto spool heads in general, for it is apparent that soldering terminals attached in the manner herein described could be used to advantage in many instances too numerousto mention.-

Iclaim:

1. In a terminal setting tool, a bl'anksupporting member comprising means for properly positioning ablank thereon, means for guiding a metal strip so that the end thereof may be readily inserted into a recess provided in the blank, and a punch for deform-- ing the portion of said metal strip within said recess to secure said strip therein and cugtingoff said metal strip to form a termi na 2. In aterminal setting tool, a member for positioning and supporting a blank, said member having a portion arranged to project into a slot in said blank, apunch, said punch having a portion operative to register. with said last mentioned portion and likewise to project into said slot, means for guiding the end of" a metal strip into said slot between said portions, said portions r being jointly operable to crush the end portion of said metal strip whereby the latter is engaged with the sides of said slot and secured therein, said punch operating to cut off said metal strip to form a terminal.

3. In a terminal setting tool, a die-plate, a blank supporting member yieldably mounted in a recess in said die-plate, means for positioning a blank on said supporting member, a punch for co-operating with said blank supporting member, means for guiding the end portion of a metal strip into a slot in a blank on said supporting member, said punch and supporting member being jointly operable to compress the end portion of said metal strip, said punch being operable to cut off a portion of said metal strip to thereby form a terminal.

4. In a terminal setting tool, a die-plate, a blank supporting member yieldably mounted, in a recess in said die-plate, means for positioning a blank on said supporting member, a punch operable conjointly with said die-plate and said supporting member to compress and cut off the end portion of a metallic strip whereby to form and secure a terminal within a slot in a blank on said supporting member, means for guiding a metal strip whereby the end portion thereof tioned forming and cutting operation, and

means for preventing retrograde movement of said metal strip.

5. In a terminal setting tool, a die-plate having a recess, a blank supporting member fitting within said recess and movable in one direction, a pair of pins secured to said sup porting member and extending through apertures in said die-plate, a resilient me1nber engaging said pins and operable to yieldably hold said supporting member in its normal position, a lug formed on the face of said supporting member and positioned to register with a slot in a blank, a punch, a lug formed on the face of said punch and positioned to register with the first mentioned lug, and means for guiding the end portion of a metal strip into the slot in said blank and between said lugs, said lugs being suitably formed to engage and compress the end of the metal strip whereby the latter is expanded into engagement with the sides of said slot and thereby secured therein, said punch and said die-plate being jointly operable to cut off said metal strip to form a terminal.

In testimony whereof I afiix my signature.

EDWARD BERGMAN.

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