US1248318A - Contact-point bed. - Google Patents

Description

I. HADLEY.

CONIACT POINT BED. APPLICATION FILED JULY 16. I917.

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Patented Nov. 27, 1917.

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masses Specification of Letters Patent.

Patented New. 12?, Edit.

I Application filed July 16, 1917. Serial Ito. 180,960.

'To all whom it may concern:

Be it known that I, IRVING HADLEY, a citizen of the United'States, residing at Los Angeles, in the county of Los Angeles and .State of California, have invented new and useful Improvements in Contact- Point Beds, of which the following is a specification.

This invention relates to a grinding block for contact points.

In the various ignition systems used in connection with internal combustion engines, contact points are utilized to make and break the circuits within the timer, or magneto. It is essential that these points strike the contact plates squarely in order to prevent corrosion of the points and a weakened current. It is the principal object of this invention to provide a simple device for holding the contact points while they are being ground so that the endv face of the points may be smoothed with precision, thus pro.

ducing the results desired.

Other objects will appear hereinafter.

The invention is illustrated, by way of example, in the accompanying drawings in which:

Figure 1 is a view in perspective illustrating the grinding bed and particularly showing the contact point channel extending the length thereof.

Fig. 2 is a view in transverse section through the grindingbed disclosing one of the contact. members mounted therein.

Fig. 3 is a view in longitudinaf section as seen on the line 3--3 of Fig. 2 illustrat-.

ing the manner in which a spring contact member is held in the block.

Fig. 4 is a view in longitudinal section illustrating a contact screw as mounted for grinding within the block.

Fig. 5 is a perspective'vicw of one'of the shims used with the block.

Fig. 6 is a view in perspective illustrating the spring contact member which is ground.

Fig. 7 is a view in perspective illustratingzone of the screw contact members.

. eferring more particularly to the drawin 10 indicates the grinding bed preferabl? formed of a Hat piece of hardened steel, rectangular in shape. This bed has a groove 11 extending its lengthv and provided to receivethe leaves 12 and 13 of the spring contact member 14. The side walls of the groove are formed with two inclined faces 5 undid-forming an intermediate shoulder 17 upon which the upper lea-i 12 rests during the grinding operation, as particularl shown in Fig. 2. Formed upon diametrically opposite sides of the groove are threaded openings 18 and 1.9 which extend through the bed and may be used for two purposes. When the spring contact members 14 are being ground, these openings may receive a clamping screw 20 by which a series of shim plates 21 are secured. This screw passes through openings 22 in the shim plate, while openings 23 are provided to receive the contact point 2% of the member. it. in the other instance, a contact screw 25 is ground by passing it through one of the openings 18 and 19 and allowing it to pro ject slightly above the face of the bed. When the device is used in grinding the spring contact members, the member is inserted into one end of the groove 11, care being taken to place the leaf 12 above the shoulder 17 in the-groove and the lower leaf 13 in the groove portion therebeneath. A

suficient number of shim plates are then placed over the bed and their openings 23 rought to register with the contact point 24.. When enough of the plates have been placed over the point to allow it to barely extend above the surface of the top plate,

the clamping screw 20 is placed through the openings 22 and drawn tight against the face of the bed. As the shim plates are hardened steel, the assembled block may then be placed face downward upon a Whetstone and rubbed thereover until the contact point is flush with the face of the outer shim.

This will insure a square smooth surface upon the end of the point. In grinding the screw contacts 25 the screw is inserted into one of the openings 18 and 19 and tightened down until it iprojects slightly above the opposite face 0 the plate. It may then be whetted as desired.

It will thus be seen that the grinding block hereprovided is simple in its construction andwill allow the contacts to be ground with precision.

While I have shown the preferred form of my contact point bed as now known to me, it is evident that various changes in the combination, construction and arrangement of parts may be made by those skilled in the art without departing from the spirit of my invention.

ll claim:

l. A grinding bed, comprising a solid bed.

portion, aslot extending lengthwise thereof for the'reception of contact points to the ground, and means for holding the face of the points square with the face of the bed during the grinding operation.

2. A grinding bed, comprising a solid bed ortion, a slot extending lengthwise thereof or the reception of contact points to the ground, means for holding the face of t 2- points square With the face of the bed during the grinding operation, and means for positively determining and limiting the depth of metal'to be ground from the ends of the points.

3. A. grinding bed for contact points, comprising a hardened steel bed plate having a longitudinal slot extending the length of one face thereof, threaded openings positioned through the bed plate at opposite sides of the slot and at'right angles to the faces of the plate, and hardened steel shim plates adapted to be secured upon the face of the bed plate in a manner to protect the point of the contact member extending from the slot or through one of the threaded openings.

'In testimony whereof I have signed my name to this specification.

' IRVING HADLEY

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