US2275757A - Crankpin grinder - Google Patents

Description

March 10, E s HANSON JR CRANK PIN GRINDER Filed June 9, 1941 2 Sheets-Sheet l INVENTOR.

BY M,

March 10, s HANSON JR CRANK PIN GRINDER Filed June 9, 1941 2 Sheets-Sheet 2 IN V EN TOR.

Patented Mar. 10, 1942 Claims.

This invention aims to provide a novel structure for grinding the pin of the crank shaft of an engine, preferably an internal combustion engine, the construction being such that much of the engine structure will come into play during the grinding operation, it being necessary to supply no more than a simple mechanism, supplemental to the engine parts, to bring about a grinding operation.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings:

Fig. 1 shows in transverse section, a device embodying the invention, most parts being in elevation;

Fig. 2 is an elevation wherein the parts are viewed at right angles to the showing of Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 2;

Fig. 4 is an elevation showing one of the nuts, parts being sectioned away;

Fig. 5 is a sectional view showing the device in use on an internal combustion engine of the yp Fig. 6 is a top plan of the structure delineated in Fig. 5.

The numeral l marks a crank pin, preferably forming part of an internal combustion engine. The crank shaft disks are shown at 2. The numeral 3 marks a fixed bearing on a pitman 4, the bearing cooperating with the crank pin I. The pitman 4 is pivoted, as indicated at 5a in Fig. 5, to an engine piston 6a, mounted to reciprocate in an engine cylinder la.

Bolts 8 and their nuts 9 are used to hold assembled with the fixed bearing 3 and with the crank pin I, a removable bearing (not shown), complemental to the bearing 3 and cooperating with that bearing to receive the crank pin I,

when the engine is in working condition. Whenthe grinding operation is to take place, the aforesaid complemental bearing (not shown) is removed, and its place is taken by spacers ill on the bolts 8. Spring plates H are placed on the bolts 8 and are held in abutment with the spacers IE1 by one of the nuts 9, and a specially constructed nut [2. The spring plates H hold the crank pin I seated in the bearing 3.

The nut l2 has a spindle It, provided with a transverse shoulder ii of any desired construction. A nut I6 is threaded on the lower part of the spindle I l and is held against rotation, backwardly, by a lock washer ii.

The machine includes a frame, denoted as a whole by the numeral I8, the frame including a tubular bearing [9, disposed parallel to the spindle hi, the bearing having transverse, outstanding arms 20 and 2|, mounted to swing on the spindle, the arm 2| abutting against the lock washer H, which is retained by the nut 16. A coiled spring 22 surrounds the spindle l4, and abuts at its upper end against the shoulder IS on the spindle, the spring abutting at its lower end against the arm 2|.

A grinding mechanism is provided, and includes a motor 23 secured to the lower end of the bearing member 19 of the frame i3. A shaft 24 is mounted to rotate in the bearing l9, and is connected to the shaft 25 of the motor 23 by a coupling 26. A grinding wheel 21 is secured to the upper end of the shaft 24 and engages the crank pin I.

When the parts are assembled as shown in Fig. 1, the frame I8 is swung lengthwise of the crank pin I, on the spindle l4 of the nut l2, the motor 23, the shaft 25, the coupling 26 and the shaft 24 impart rotation to the grinding wheel 21, and the irregularities on the crank pin I are ground away when the crank pin is caused to move in an orbit. If the device is used on an automobile, the after end of the automobile may be jacked up, and the crank pin I be caused to move in an orbit by turning manually, the rear wheels of the automobile.

The position of the grinding wheel 21, relatively to the crank pin I, is attained by manipulating the nut it. The function of the spring 22 is to hold the arm 2! of the frame l8 down on the washer I! when the grinding wheel 21 moves over a low place in the crank pin i.

In Figs. 5 and 6, parts hereinbefore described have been designated by numerals already used,

with the suffix a. Figures 5 and 6 show that the device is useful in connection with a motor of the V-type, as well as with a motor the cylinders of which are disposed vertically above the crank shaft.

Having thus described the invention, What is claimed is:

1. A crank pin grinder comprising an engine cylinder, a piston slidably mounted in the cylinder, a pitman pivoted to the piston and provided with a fixed bearing shaped to receive a crank pin, a bolt carried by the fixed bearing and forming part of means for assembling a complemental, removable bearing assembled with the fixed bearing and with a crank pin, a nut threaded on the bolt and having a spindle, a frame mounted on the spindle, and grinding mechanism carried by the frame and so located as to engage a crank pin mounted in the bearings.

2. A crank pin grinder constructed as set forth in claim 1, and wherein the frame is mounted to swing on the spindle, to carry the grinding mechanism lengthwise of a crank pin mounted in the bearings.

3. A crank pin grinder constructed as set forth in claim 1, in combination with a spacer on the bolt, and a spring on the bolt, between the spacer and the nut, the spring exerting pressure in the direction of the fixed bearing, on a crank pin mounted in the bearings.

4. A crank pin grinder constructed as set forth in claim 1, and wherein the frame is mounted to swing on the spindle, lengthwise of a crank pin which is mounted as aforesaid, and to move for adjustment longitudinally of the spindle, to bring the grinding mechanism into engagement with a crank pin which is so mounted, means under the control of an operator and carried by the spindle and cooperating with the frame to advance the grinding mechanism into engagement with a crank pin which is so mounted, and spring means engaged with the frame and with the spindle to hold the frame engaged with the means under the control of an operator.

.5. A device of the class described, constructed as set forth in claim 1, and wherein the grinding mechanism comprises a shaft supported for rotation on the frame, a motor carried by the frame and engaged with one end of the shaft, and a grinding wheel mounted on the opposite end of the shaft.

EDWARD S. HANSON, JR.

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