US1966601A - Breaker-point dresser - Google Patents

Description

Patented July 17, 1934 Y 7 crime? stutter, satellite at; its;

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o: a'tion February 7,

scitmi's." (oust--21? Thisinvention relates. to'a lbreaker-pbintzdress; er; and its principal object .is vtoprovide a simple and convenient tool for the purpose of accurate;

; lyaand expeditiouslydressing the breaker-points of; electrical devices, such as autoniobiledistribu: tor heads; and more, particularly, breaker points of the type. carried on a bracket projecting from a; pivoted breaker-point, arm where the arm is offset from; and extends along" one side of, the breakerepoint. t Breaker-points are subject to electrical arcing, these surfaces, howevergnay bev perfectly restored, by ,re g rinding them; true and square.

. The; device org-the present-inventio consists of a: h lding port n, pre e bly; i te a wi h" an overhanging guide portion, andjproiec inaat sub: stantially right angles therefrom, thus, together formingans lz-shap'edelement. The holding portion is adapted to temporarily carry an offset breaker-point arm in such a position that the working face of the breaker-point, fast in the bracket, may be brought into contact with the grinding surface of a Whetstone, without inter- 1 ference from the offset arm.

The features of this invention for which the protection of Letters Patent of the United States is desired, are collectively grouped in the claims concluding this specification.

In the drawing,

Fig. 1 represents a plan of my improved breaker-point dresser as it is held in the hand of a person using it, ready for grinding-a breaker-point;

Fig. 2, a front elevation;

Fig. 3,'a side elevation;

Fig. 4, a plan, showing the dresser with a breaker-point arm in place for grinding on a Whetstone, parts being broken away for clarity; and

Fig. 5, a fragmentary portion of Fig. 2, showing a certain part in an alternate position.

Referring to the drawing, the numeral 10 indicates the dressing tool proper, which consists of a substantially L-shaped structure, one leg of which forms a holding portion 12 and the other leg a guide portion 14. The guide portionis preferably integral with the holding portion and naturally projects therefrom at substantially a right angle, thus overhanging the holding portion on one side. The inside face 15 of the guide portion forms a grinding-guide plane, adapted to ride lightly on the grinding surface 16 of a Whetstone 17. If de-' sired, the face 15 may be hardened by any well known means.

The outside face 18 of the holding portion forms an arm-guiding plane and is so disposed that a breaker-point arm 19 can be brought thereagainst teiiiiibiriiirfiidiii as .riiiqiibi bil -.1216 whereby the arm 19 has angular motion in plane 18 m i 5.. all; I; L1. .1 'H' A spring 21. pr fe a l ade oifiatsWeL-may ,6 hfiihflQUP-JQQQQLZ 'tbeuppennc ti -he dres nato. and; di c edtaha eits free mbttueb ea er-wmt atp teel e may have a limit 20. The tool is now held in one hand, and brought down upon the surface of the Whetstone until the lower right-hand edge of the guide member 14 touches the stone, and at the same time, the tool is forced down until the guide 2:1 plane coincides with the grinding plane.

At 34 is indicated in dotted lines, a breakerpoint arm of anotherdesign, that is, where the breaker-point 38 is on the opposite side of the bracket 35 from that of the offset-arm, 36, instead of on the same side of the offset-arm 37, as is the case with breaker-point arm 19.

In the use of the tool, the operating effect upon the breaker-points in both the cases just described, is of course the same, since the posi tion of 33 and 35 is common to both. 99

The portion 25 is provided as a convenience for holding straight breaker-points, such asthose indicated at 26 and 27. These straight breakerpoints may be of different kinds, and may been; disposed in notches 28 and 29 respectively, by means of a flat spring 30, which latter may be. suitably tensioned under a knurled nut 31, threaded on a stud 32, to clamp the breaker-points- Since breaker-point arms are often made left and right, in the same equipment, it will be noted in Figs. 2 and 5, that the slot 24 and hole 20-1 are in duplicate, but on opposite sides of the tool, so as to accommodate either right-hand or lefthand breaker-point arms. For this purpose, the spring 21 is lightly held in either of the slots 24, as the case may be, whereby the spring may be easily interchanged between left and right positions whenever required. Other holes (not shown) may be provided for pivoting arms of other designs, as desired. 1

w Theslotted portions may have any suitable positions but are preferably located at, or in proximity to, the ends of the line of intersection between the grinding-guide plane and the armguiding plane.

While a specific embodiment of this invention is herein shown and described, it should be clearly understood that various changes in the details thereof, can easily be made without departing from the spirit and scope of the following claims. 7

Having fully described my invention, what I claim is:

1. A breaker-point dresser, including in combination, an L-shaped structure having a surface on the inside of one leg thereof adapted to ride on a grinding surface, the other leg of the L having a guide surface on the outside thereof, thus constituting a holder disposed trans versely to the first-mentioned surface, and means for mounting a breaker-point arm on said holding' member guide surface in such a manner that the face of the breaker-point carried by said breaker-point arm may be brought into coincidence with said grinding surface.

2. A breaker-point dresser, including in com bination, an L-shaped structure, the inside of one leg of which constitutes a guide member having a surface adapted to ride on a grinding surface, while the other leg of the L constitutes a holder disposed transversely to the guide memher for the purpose of supporting a breakerpoint arm, and a spring operative to normally depress said breaker-point arm to a position below said guide-member riding surface.

3. A dresser for breaker-points fast in an arm structure, including in combination, a substantially L-shaped element having an arm-guiding plane on the outer face of one leg of said element and a grinding-guide plane on the inner face of the other leg of said element substantially at right angles to said arm-guiding plane; means for holding a breaker-point arm with the side face thereof in coincidence with said armguiding plane, and means for causing the working face of the breaker-point carried by said arm, to bear against a grinding surface in the said grinding-guide plane.

4. A dresser for breaker-points fast in an arm structure, including in combination, a substantially L-shaped element having an arm-guiding plane on the outer face of one leg of said element, and a grinding-guide plane on the inner face of the other leg of said element, said planes being disposed at suitable angles relative to each other, means for pivoting a breaker-point arm so as to be movable in the arm-grinding plane, and a spring extending'from a point in proximity to the line of intersection between the said planes to a point where said spring exerts a pressure operative to cause the breaker-point to bear on 'a grinding surface in the said grinding-guide plane.

5. A dresser for breaker-points fast in an arm structure, including in combination, a substantially L-shaped element having an arm-guiding plane onthe outside face of one of its legs and a grinding-guide plane on the inside face of its other leg disposed at a suitable angle to said armguiding plane; means for pivotally securing a breaker-point offset arm in said arm-guiding plane, a spring mounting near each end of the line of intersection between the arm-guiding plane and the grinding-guide plane, and a spring adapted to be interchangeably positioned in either of a said spring mountings.

CHARLES J. STOCKER.

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