US1567353A - Method of forming brake levers - Google Patents

Description

Dec. 29, 1 25. 1,567,353

L. L. WHITNEY METHOD OF FORMING BRAKE LEVERS Filed July 14, 1924 Y 2 Sheets-Sheet 2 I 5 51 r Mme =3 Patented Dec. .29, 19 25.

''UNITED STATES PATENT OFFICE.

LOREN L. WHITNEY, OE HAMMOND, INDIANA, ASSIGNOR '1'0 AMERICAN STEEL FOUNDRIES, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

METHOD OF FORMING BRAKE LEVERS.

Application filed July-14,1924. Serial No. 725,788.

To an whom it may concern:

Be it known that I, LOREN L. wmm,

Figure 21 is a-front view of the hammer dies;

1 a citizen of the United States, residing at\ Figure 22 is a view of the hammer dies as Hammond, in the county of Lake and State of Indiana, have invented certam new and useful Improvements in Methods of Forming Brake Levers, of Wl'llCh the following is a specification.

' This invention relates to a new and improved method of forming brake levers and more particularly to a method of fornnng dead brake levers provided wlthtrunmons from which they are supported.

It is an object of the present invention to provide a method of this character adapted to form levers of this type from slmple blanks by means 'of a serles of hammering and for in 0 erations;

-It is a ffi'th r object to provide a method of this character in which provision 1 s made for the removal of excess metal during the forging operation.

It is an additional ob ect to provide a method comprising a series of simple steps adapted for rapid commercial production.

Other and further objects W111 appear'as the description proceeds.

I have illustrated in the accompanying drawings the blanks used as they appear in different steps of the operation, and have also shown the dies suitable for performing these steps.

In the drawin Figure 1 is a side view of the blank;

Figure 2. is an end vlew of Flgure 1;

Figure 3 is a top view of the blank after the first hammering OPBIHJZIOIU Figure 4 is a face View of Figure 3;

Figure 5 is an end v ew of Figure 3;

Figures 6, 7, and 8 are views similar to Figures 3, 4, and 5, but shOW the blank after the second hammering operation;

Figures 9,10, and 11 are views similar to Figures 3, 4, and 5, but show the blank after the third hammerin operation;

Figures 12, 13, an 14 are views similar to Figures 3, 4, and 5, but show the blank after the first forging operation;

Figures 15, 16 and 17 are similar to Fig ures 12, 13 and 14, but show the blank after the removal of excess metal.

Figures 18, 19 and 20 are similar to Figures 12, 13, and 14, but show the blank after the second and final forging operation;

seen from the left;

Figures 23 and 24 are perspective views of the forging dies;

Figure 25 is a perspective view of the first pass plunger; and

Figure 26 is a perspective viewof the second pass plunger. The blank 31, as shown in Figures 1 and 2, s rectangular in form. In the first hammermg operation one end of the blank 32 is used as a holder and theother end 33 is flattened between the hammer die portions 34 and 35. It is also shaped to the form shown in Figure 4 by means of the hammer die portions 36 and 37. This forms the right or connecting end of the lever to approximately its finished form. Next, the intermediate portion 38 of the lever is brought to the form shown in Figure 7 by means of the hammer die portions 39 and 40. The flattened portion of the lever is then brought to the final form shown. in Figure 10 by means of the hammer die portions 41 and 42, the connecting end being rounded as shown at 431 During these hammering operations the blank has been reversed occasionally and the portion 32 of Figure 4 has been somewhat flattened as shown at 44, this flattoning being in a plane at right angles to the plane of the body of the lever.

Now, using the body of the lever as a holder, the portion 44 of the blank is introduced into the lower recesses 45 and 46 of the dies 47 and 48, shown in Figures 23 and 24. It will be noted that the recess 46 is provided with a laterally extending cavity 47 adapted to receive excess metal. The dies 47 and 48 are brought together and the plunger 49 has its portion 50 introduced into the recesses 45 and 46 and against the end of the portion 44. This portion is now brought to the form shown at 51 in Figures 12 to 14. Any excess metal is forced into cavity 47 and forms the irregular boss 52. This provision of means for taking care of the excess metal prevents stalling or breaking of the forging apparatus. The excess metal52 is next removed, preferably by a hot sawing operation, and the blank assumes the form shown in Figures 15 to 17.

The blank is now placed in the upper re- 10 to pivot or connecting pins.

cesses 53 and 54 of the dies 47 and 48, and the plunger 55 shown in Figure 26 has its portlon 56 brought against the portion 51 of the blank. This final forging operation 5 brings the blank to the form shown in Figures 18 to 20, having the laterally extending trunnions 57 and 58. In preparing the lever for use, the portions 38 and 43 will be suitably drilled to provide for their connection While the method has been described as applied to the forming of one specific form of lever, it is obviously capable of forming other levers by suitable change in die design, and I contemplate such modifications as come within the scope of the appended claims.

I claim:

1. The method of forming a brake level or the like, which comprises hammering a blank to form the body and connecting portions of the lever, forging one end to form trunnions thereon, and sawing from the trunnlons excess metal from the forging Y 25 2. The method of forming a brake lever operation.

or the like, which comprises hammering a blank to form the body and connecting portions of the lever, forging one end to partially form trunnions thereon, removing excess metal of this forging operation, and again forging the trunnion end to complete the formation of the trunnions.

Signed at Hammond, Indiana, this 9th day of July, 1924.

LOREN L. WHITNEY.

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