US727571A - Brush-holder. - Google Patents

Description

PATENTED MAY l2, 1903.y

A. F. BATGHELDER.

BRUSHfHOLDER. APPL'IOATION FILBDVSEPT. 3,1901.

I0 MODEL.

lm/eror', Pls@ F. Batchelder'.

PHZJCLJ.

UNITED STATES Patented May 12, 1903.

PATENT OFFICE..

ASA F. BATCHELDER, OF SCI-IENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEWT YORK.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 727,571, dated May 12, 1903.

Application filed September 3, 1901y Serial No. 74,245. (No model.)

T0 @ZZ whom/,it may concern:

Be it known that I, AsA F. BATCHELDER, a citizen of the United States, residing at Schenectady, county of Schenectady, State of `New York, have invented certain new and useful Improvements in Brush-Holders,of which the following is a specification.

This invention relates to dynamo-electric machines; and its object is to provide an improved brush-holder. The invention is especially applicable to the electric air-compresser shown and described in my application led September 3, 1901, Serial No.Y 74,244.

The brush-holder hereinafter set forth embodies several features of the one patented by E. D. Priest April 24, 1900, No. 684,052. It has a box affording aguide for the carbon brush and a receptacle for the spring which forces the presser-bar against said carbon. The box is supported by a stud insulated from the box and covered bya refractory insulator. The stud is secured in a clamp which is fastened to a bracket on the head of the motorcasing. My improvements consist in making the stud adjustable radially of the commutator, so that the brush-holder can be moved inwardly as the commutator wears without changing the point of commutation, in providing the presser-bar with a tailpiece to enable it to be more easily and safely manipulated, and in the modified construction of the other parts, as pointed out below.

In the accompanying drawings, Figure 1 is a side elevation of a right-handed brushholder. Fig.v 2 is a cross-section on line 2 2, Fig. 1. Fig. 3 is a partial longitudinal section of the same. Fig. 4 is a cross-section on line 4 4, Fig. Fig. 5 is a side elevation, partly broken away, of a left-handed brushholder. Fig. Gis a sectional elevation of the same on the line 6 6, Fig. 5.

The brush-holders are forconvenience made right-handed and left-handed and are attached to the inside of the head of the casing,

somewhat as shown in the patent to E. D. Priest, December 14, 1897, No. 595,410. The casing-head A has an integral bracket a for each brush. On this rests a plate B, having a hole for a fastening-bolt b and carrying at one side an obliquely-arranged sleeve B, split longitudinally at b and provided with a transverse screw C for clamping the split sleeve upon the upper end of a stud D. A key d, fitting in longitudinal grooves in the sleeve and the stud, keeps the latter in a tixedangular position with reference to the sleeve, but permits it to be axially adjusted therein. The lower end of the stud is rmly secured in a socket in a brush-carrier E and insulated therefrom as follows: Dry mica insulation is formed into a tube F, one end of which is inserted into t-he socket e in the carrier E. Anl expansible lining G of sheet metal, preferably made in halves, as shown in Fig. 4, is then inserted into the tube F, and the studD is then driven into said lining, expanding it and the mica and wedging them and the stud tightly in the socket e. A mica washer f is then set into the lower end of the socket, and a tubular protector I-I, of porcelain, rubber, or the like, is slipped over Vthe stud to protect the mica above the carrier E. The upper end of the stud can then be inserted into the split sleeve B and clamped by the screw C. The protector I-I affords a smooth hard surface which can be wiped clean at intervals, Whereas the mica tube would soon be broken by wiping if the protector were not used. The outer surface of the protector is preferably beaded or corrugated, as shown, to aord a longer creeping-surface in case the current attempts to leak over it.

The brush-carrier E has a hub e', contain-` ing the socket e, in which the stud Dis fixed,

.and an offset receptacle'ez, having an open top and containing at one end a slot or guide for the carbon brush I. Resting on the upper end of the brush is a curved block K, secured to the end of the at presser-arm K', which is secured to the dat upper side of a block L, pivotally mounted on a pin M, extending across the receptaclee `On each side of the block is a star-shaped Wheel N, supporting oneportion ofu the double-coiled spring P, Whichhas a middle loop 19 lying over the arm K. The extremities offthe two coiled portionsV are'hooked or otherwise secured to a transverse pin M or other fastening.

It Will be seen that the plate B and bolt b coperate with the oblique clamping-sleeve and axially-adjustable stud to afford ample Ioo opportunity for adjusting the brush-holder to meet the requirements of service. The stud is arranged with its axis radial to the comm utator, so thatit can be adjusted length- Wise when the commutator wears down without altering the point of commutation. lt also makes a strong, rigid, and compact structure. The presser-arm extends to the rear of the block L, forming a tailpiece 7c', which enables one to lift the presser-block K easily, quickly, and safely when it is desired to remove the brush. 1n Fig. 1 the presser-baris shown in dotted lines at :c in the position it takes when thus pressed back. Position y is the one it takes when in Contact with a brush which is nearly worn out, the end of the receptacle being slotted at e3 to permit the arm to follow the brush down. The lead S for conveying current to the brush is attached to the receptacle e2.

W hat I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a brush-holder, attaching means comprisinga plate havinga bolt-hole, and a sleeve integral with said plate and located with its axis oblique to the axis of the bolt-hole.

2. In a brush-holder, attaching means coinprising a plate having a bolt-hole, a split sleeve supported by said plate with its axis oblique to that of the bolt-hole, and a clamping device for said sleeve.

3. In a brush-holder, attaching means comprising a plate having a bolt-hole, a split sleeve supported by said plate in an oblique position, and a clamping-screw transverse to the split in the sleeve.

4. A brush-holder having a stud, and a clamping-sleeve for said stud provided with a securing-plate extending laterally and obliquely to said sleeve.

5. A brush-holder having a metallic stud insulated therefrom, arranged with its axis radial to the commutator, and a stationary metallic clamping device engaging the outer end of said stud.

6. A brush-holder having a stud arranged with its axis radial to the commu tator, a split sleeve receiving the outer end of said stud, a

key preventing angular movement of the stud in said sleeve, and a screw for clamping said sleeve on said stud.

7. A brush-holder comprising a metallic clamping-sleeve, a stud engaged by and adjustable in said sleeve radially to the commutator, and an insulated brush-carrier on the inner end of said stud.

8. In a brush-holder, a presser-bar having a tailpiece extending in the rear of its pivotal point, and a spring engaging the presserbar in front of its pivotal point.

9. In a brush-holder, the combination with a pivoted block, of a presser-bar secured to said block and having a rearward extension.

10. In a brush -holder, the combination With a stud, of a brush-carrier having a hub provided with a socket receiving said stud, and an offset spring-receptacle located by the side of said hub, having an open top, a slotted guide at one end for the presser-bar and a slot at the other end for the tailpiece of said bar.

11. ln a brush holder, the combination with a stud, of means for supporting it With its axis oblique to the plane of the support, and a brush-carrier fixed upon and insulated from the stud.

12. In a brush holder, the combination with a stud whose axis is radial to the commutator, of a support for the stud having a fastening device in a plane oblique to the axis of the stud, and a brush-carrier Offset from the axis of said sind and insulated therefrom.

13. In a brush holder, the combination with a stud whose axis is radial to the commutator,of a support having a fastening device in a plane oblique to the axis of the stud, a brush-carrier insulated from the stud and offset therefrom, and a tubular beaded protector surrounding the stud between said carrier and the support.

In witness whereof I have hereunto set my hand this 30th day of August, 1901.

ASA F. BATOHELDER.

Vitnesses:

HENRY J. THON, M. H. EMERSON.

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