US1856723A - Manufacture of brush rigging - Google Patents

Description

Y May 3, 1932.

A. w. PHELPS 1,856,723

MANUFACTURE OF BRUSH RIGGING Filed Dec.

Patented May 3, 1932 UNITED. STATES ALVA w. minus, or manna.

SGN, INDIANA,

PATENT OFFICE) 'nssrenoa mo DELCO-BEEZ coarona'rron,

OF DAYTON, OHIO, A CORPORATION OF DELAWARE MANUFACTURE OF BRUSH BIGGING Application filed December 17, 1 928. SerialNo. 326,693.

This invention relates to the manufacture of third br ush rigging for a generator. H An, ob ect of this invention is to provide, as a new article of manufacture, a brush carrying rigging where the metal parts are an- These parts are held chored in a relatively rigid position, but

I not so as to prevent axial movement of the pin and the stud. The molded phenol condensation product has been sealed around the aperture, in the brush carrying bracket so that it is rigidly anchored in place and cannot be removed.

* Another'object of this invention is to provide a die having a pan of apertures, one for stud and the brush carrying the pin and one for the stud and a recess for the brush carryingbracket. This die also has a cavity perm tting the phenol condensation product to flow around the end of the pin and the end of the stud and around the aperture in the brush carrying bracket whereb the phenol condensation product, upon being heated, may be forced to flow into the cavity, thereby joining the pin, the stud and the bracket together into a unitary brush carrying rigging.-

Another ob'ect of this invention is to join the brush hol ing pin or arm and the spring stud into the brush carrying bracket by molding a dielectric material such as a phenol condensation product or synthetic resin around these parts at their surfaces of juncture. This is accomplished by assembling the brush holding arm or pin, the spring bracket into recesses provided therefor in a mold or die, the recesses being so arranged that the pin or arm, the stud and the bracket are separated then forcing a phenol condensation product into a cavit provided therefor inthe die, by means 0 a cooperating die so that the phenol condensation product will flow around the pin, the stud and the bracket in order to hold these parts in an insulated relapin 18 and the i into which tion to each other upon the solidification of the phenol condensation product. The res'ults of this process are a time, a decrease in the number of parts, a better brush carrying riggin and g Further objects and advantages of the present invention will be apparent from-the following description, reference being had to the accompanying drawings wherein a preferred embodiment of one orm of the present invention is clearly shown.

I In the drawings:

large saving of g Fig. 1 shows a "plan view of the brush carr m r1 ng.

Fig. 2 i s an end view of the brush carrying rigging.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 4, and shows the parts assembled. in the mold previous to the molding operation. 5 I

Fig. 4 is a sectional view taken on the line 4 4 of Fig. 3 previous to the molding operation.

Fig. 5 is a sectional view, on the line 55 of Fig. 6.

Fig, 6 is a sectional view taken on the line 6-6 of Fig. 5.

. Referring to the drawings, the reference character -10 indicates the supporting member, such as a metallic brush carrying bracket, which has an aperture 12 through which the armature shaft (not shown) aperture 14 on passes. It also has an oblong which is molded a unit of insulating material 16 supporting the brush carrying arm or spring stud or pin 20. The brush carrying pin 18 and the stud 20 have annular recesses 22' and 24: respect vely which prevent axial movement of'the pm 18 and stud 20 after the recesses have been filled with an insulating material and this has solidified, anchoring t eparts in a relatively rigid position.- A die or mold 26 has a recess 28.1nto which fits the brush carrying bracket 10. It also has a pair of apertures or recesses 30 and 32 are inserted the pin 18 and the stud 20, respectively. In Figs. 3 to 6 inclusive, it may be clearly seen that the upper surface ofthe brush carrying bracket 10 is "die 26 and method, is neat in .appearance cheaper.

a brush carrying flush with the upper surface 34 0f the die 26. A suitable insulating material for this purpose has been found to be a phenol condensation product or a suitable synthetic resin which changes its physical state from a solid to a plastic upon the application of heat and pressure and solidifies upon being cooled.

In the die 26 and surrounding a portion of the pin 18 and stud 20 and the aperture 14 is a cavity 36 provided to receive the phenol condensation product so as to anchor and insulate from each other the pin 18, stud 20 and brush carrying bracket 10. A pellet, or pre-formed block of molding compound 38 made from phenol resin, is placed over the cavity 36 by the operator. The pellet is forced by the die-member 40 into the cavity 36, the dies 26 and 40 being heated by suitable means not disclosed and pressure applied to member 40 so as to force this plastic composition to flow into the cavity 36, filling all parts thereof as indicated by the refer ence character 42 in Figs. 5 and 6. The die may be held in this position a predetermined interval of time, permitting this plastic composition to set or undergo a change from a plastic to a hard rigid insulating composi tion. The dies assembled brush from the die 26 and is now ready for use. The cooling of the brush rigging may take placebefore or after removal from the die, or both before and after. The parts used for a second rigging are then assembled in the the process repeated.

From the above it may be clearly seen that all riveting, all insulating washers and all tubular insulating members are eliminated the manufacture of this is far suy the old and is far are then separated and the per1or"*to the one produced While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A brush carrying rigging for a third brush e a brush carrying bracket havin tures, anchoring means anchored said apertures, a pin) with an annularrecess embeddedin the anchor,-a stud having an annular recess embedded whereby the bracket, the pin and the stud are held in 'a relatively rigid position.

two aper- 2. A brush carrying rigging for a third comprising in combination,

brush generator,

bracket having'an aperture, a unit of insulatingmeans anchored in said aperture, a-pin embedded in said unit for carrying rigging is removed in one of.

into the anchor,

In testimon signature.

nerator, comprising in combination,

y whereof I hereto afiix my ALVA W. PHELPS.

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