US1925721A - Method of making yoke ends - Google Patents

Description

'.: head formed thereon.

into a second set of dies and split from its head Patented Sept.` 5,7 1,933v

. UNiTEofsrATEs METHOD oF MAKING YoKE ENDS Leroy 0. Johnston, Detroit; Mich., assignor to I General Motors Corporation, Detroit, Mich., a

corporation of Delawarek Application November 11', 1931 Serial No. 574,319

4 claims. fol. .2g- 152) This invention relates to an improvement in yoke ends.

In the installation of the brakes on automotive vehicles, a number of yoke ends are used and it is the object of the invention to construct a yoke end by a new method of manufacture which is much cheaper and which will enable the production of cheap and efficient yoke ends. f

In carrying out the invention a piece of round stock is placed in a set of dies and an oblong The piece is then put end the greaterv portion of its length. If desired, the split yoke ends may also be formed at the same time they are split,- the Vtools being suitably shaped. After being split, the yoke end is placed in the third set of dies'where the split head is suitably formed into the usual knobs at the ends of the yoke. The yoke end is now placed in a fourth set of dies in which it is shaped into its final yoke form. In the performance of the above operations, the metal is preferably cold although it may be heated if desired.

On the drawing:

Figure 1 is a sectional View through the first die showing the piece of stock in position and` the head formed thereon. y

Figure 2 shows the second set of dies (with the piece of stock taken from the dies of Figure 1) performing the splitting operation.

Figure 3 shows a third set of dies and the operation of forming the knobs on the end of the yoke.

Figure 4 shows the fourth operation in which the yoke endof Figure 3 is Vbent to its nal form.

Figure 5.is a modification in which the knobs on the yoke end are formed at the same time that the piece of stock is split.

Figure 6 is a vmodification of the structure shown in Figure 3. y

Figure 7 shows the completed yoke end. Referring to the drawing, the numeral 2 discloses a lower die and the numeral 4 an upper die. The piece of stock is indicated at 6 which is placed in the lower die 2 and the upper die 4 forced thereon to form the oblong head 8. After the formation of the stock 6 to the shape shown in Figure 1, it is transferred to the die 10 and the tool 12 having the knife edge 14 caused to descend thereon to cut or split the stock 6 at the head portion 8 separating the head into two halves 16 and 18, the stock also being split the greater portion of its length. Y

'Ihe piece of stock is now transferred to the dies 20 and 22 where the split head portions 16 and 18 are given the form shown at 24 and 26, the dies being suitably shaped to give this formation. The upper die22 is caused to descend on the lower die 20 in the operation. After the yoke end has been formed as shown in Figure 3, the die 22 is raised and the punch 28 operated to push the yoke end out of the die.

. The yoke end is now transferred to the dies and 32 shown in Figure 4, the purposeof the n. dies being merely to bend or shape the yoke to its final form, the completed yoke being indicated at 34 in Figures 4 and '7. The shank of the yoke is seated'in the die 30 and the die 32 pressed down to form the yoke end. When the die 32 is withdrawn it will pull the yoke 32 therewith and it may then be laterally separated. y

As an optional form of construction, the operation of Figures 2 and 3 may be combined as shown by the structure of Figure 5. In this figure, a base plate 36 has an opening 38 therein for the reception of rthe shank portion of the stock 6. A pair of -dies 40 forming a V are held on the base plate by means of the dovetail connection 42. y A tool 44 having a knife edge 46 similar to the tool 12 and knife edge 14 is caused to descend on` the bar of stock 6 to produce the split and at the same time form the knobs 24 and 26 on the split ends 16 and 18 of the stock 6. The dies 40 and tool 44, as well as the'dies 20 and 22 are suitably shaped to form the knobs 24 and 26. From the operation of Figure 5, the yoke end is passed through the operation shown in Figure 4.

Figure 6 is an optional construction from that shown in Figure 3. In this figure, the lower die 20 and the upper die 22' have a different shape to give to the yoke end a curved formation 48 at its mid portion. The dies 20' andy 22 give to the stock 6 (taken from the structure of Figure 2) two knob formations 24 and 26 similarly as is done in Figure 3. From the dies of Figure 6, the yoke end is passed through the op-l eration of Figure 4 to give it its final form.

The yoke end made by the present method produces a yoke end which is strong and needs substantially little machining. After the yoke end of the length thereof, then shaping the ends, and then in forming the yoke end to its nal form, al1 of said steps taking place while the metal is in a non-heated or cold state.

2. The method of forming a yoke end consisting of forming a head onV a piece of stock, splitting the stock at the head portion part way of the length of the stock and shaping the ends thereof, then forming the yoke end to its nal form, al1 of said steps taking place While the metal is in a non-heated or cold state.

3. The method of forming a yoke end from a bar of stock consisting of forming a head on the end of the stock while in a cold state, then in splitting the cold stock through the head and part Way of the length thereof and simultaneous- 1y shaping the split head portion, and then in shaping the yoke end to its nal form.

4. The method of forming a yoke end from a bar of stock consisting of forming a head on the end of the stock While in a cold state, then in splitting the cold stock through the head and part Way of its length, then in shaping the cold splitend, then in shaping the cold yoke end to its final form.

' LEROY O. JOHNSTON.

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