US1970867A - Triple valve lapping tool - Google Patents

Description

Aug. 21-, 1934. J. R. RKCKETTS 9 TRIPLE VALVE LAPPING TOOL firiginal Filed Dec. 5, 192'? r, f If ATTORNEYS.

TRIPLE 'VALVE James R. Ricketts, Richmo National Air Brake Original application Dec 237,959. Divided and 1, 1929, Serial No. 39 17, 1934 4 Claims..

This application is a division of my copending application entitled Triple valve lapping machine, filed December 5, 1927, and bearing Serial Number 237,959, now Patent No. 1,749,890, dated March 11, 1930.

This invention relates to machines for lapping the slide valve seats in triple valves.

It is the principal object of the present invention to provide a generally improved lapping tool capable of use in expeditiously and accurately lapping slide valve seats in triple valves.

In carrying out this invention into practice I provide a lapping tool which includes a loosely held disk. This disk is formed with a recess extending coaxially therein to a point short of its grinding surface. This recess is engaged by a pin which bears at the bottom of the recess and at the exact center thereof so that applying pressure to the pin, the proper amount of of pressure may be brought to bear on the tool during the operation thereof. I intend that the diameter of the disk be slightly less than the distance between the sides of the slide valve seat so that the tool may be revolved in opposite directions by hearing against opposite sides of the seat on opposite strokes.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawing, in which:

Fig. l is a side elevation of a machine embodying the preferred form of my invention with parts in section to more clearly disclose certain details of construction.

Fig. 2 is an enlarged view of the partially in section.

Fig. 3 is a perspective view of the lapping tool showing the same in vertical section.

Fig. 4 is a bottom plan view of the lapping tool.

Fig. 5 is a diagrammatic view showing the slide valve seat of a triple valve in plan with the lapping tool passing thereover and in engagement with one side thereof.

Fig. 6 is a plan view of the machine with parts thereof broken away to more clearly disclose the arrangement of parts.

Referring more particularly to the accompanying drawing, 10 indicates a frame adapted to be bolted to a base structure or bench. This frame is formed with a suitable bearing 11 within which a shaft 12 is journalled. A crank disk 14 is suitably secured on one end of the shaft. To drive the shaft and crank disk the other end of the shaft 12 is fitted with a lapping tool LAPPING roof.

nd, Calif., assignor to Service, Inc.

ember 5, 1927, Serial No. this application October 6,484. Renewed January 7 loose pulley 15 and a tight pulley 16. These pulleys may be connected suitable driving motor, not

by a belt 17 to a illustrated.

nected to one end of a con necting rod 24. The f wrist pin 23 is adjustable relative to the center of rotation of the crank disk 14 so that the stroke of the connecting rod 24 may be varied to suit triple valves of This is particularly desir that the Stroke of the con the length of the slide v Valve.

different dimensions. able as it is intended necting rod 24 equal alve seat in-a triple As these triple valves vary in dimensions it is essential that the stroke of the connecting rod 24 be optional may operate efficientl sizes.

The frame 10 includes a so that the machine y on valves of different lower arm 25 which extends longitudinally of the machine in parallel sm with the connecting rod. 24. At is forward end this arm 25 slidably receives a socket 26 of a table 27. This table is and its surface is machine valve and to hold the same disposed horizontally. d to receive a. triple with its axial center in parallelism with the plane of the disk 14. To

secure the triple valve to is formed with bolt holes the table, the latter in alignment with the tapped openings in the bottom fiange of the valve, so that the latter may be secured to the table by bolts. The bottom flange of the valve is also provided with engage a recess formed ,a dowel, which may in the surface of the table so as to properly align the valve with respect to the crank dis ing screw 28 engageable w k 14. It will be noticed thatthe socket 26 of the table 2'? is provided at its bottom w ith a clampith the arm 25. By

loosening this screw 28, the table and the valve may be adjusted along the tightening the screw 28 the clamped to the arm 25 in tive to the crank disk 14.

In parallelism with th vide an upper arm 29 tance above the lower short of the end thereof.

slidably receives a crosshea bell crank lever 31 is pivote of this lever 31 extends machine and is connected arm 25 table in proper and that by ay be rigidly position relae lower arm 25, I proarranged a spaced disarm 25 and terminating This upper arm 29 d 30 upon which a d. One of the arms transversely of the at its outer end to the forward end of the connecting rod 24. The

other arm of the bell cra nk lever 31 extends lower end of the recess 34c. Thus, when pres longitudinally and forwardly of the machine and is rigidly connected to the rearmost end of a flexible lap carrying arm 33.

The forward end of the arm 33 carries a lapping tool- 34 with which this application isparticularly concerned. The machine just disclosed is fully described and claimed in my copending application above mentioned.

The lapping tool 34 is disk-like and is formed with a peripheral groove intermediate its top and bottom surfaces. A retainer member 34a is secured to the arm 33 and is fitted with downwardly and inwardly bent ends which engage the peripheral groove so as to loosely connect the sure is'exerted on'the arm 33 or the pin 341), the bearing pin 34b will bear on the lap exactly at the center and adjacent its lower or grinding surface. This causes the entire lapping area of the-lapping tool to bear-on the surface being lapped with equal pressure.

' As shown in Figs; 3 and 4 the working surface .of the lapping tool is formed separately from -This working surface the lapping tool proper. is cupped and-is pressed on the lower end of the lapping tool. After being pressed into place, four radial slots are cut in the working or wear ing surface. These slots are'for'thepurposeof retaining the grinding compound utilized and to distribute it equally over the surface being lapped.

When the lapping tool is in use on a machine here disclosed, pressure is brought to bear on the arm 33 by means of a cam 35 and a cam roller In operation of the lapping tool here disclosed,

the machine is placed in operation to reciprocate the arm 33. As the connecting rod 24 moves forwardly toward the triple valve due to the pr'olapping tool is revolved in opposite directions on opposite strokes.

It should be stated that the lapping tool 34 is slightly less in diameter than the dimension between the side walls of the slide valve seat but is greater in diameter than the. width of the seat itself. This is clearly illustrated in Fig. 5 of the drawing where represents the side walls of the slide valve seat and 51 represents the sides of the valve seat proper.

From the foregoing it is obvious that I have provided an improved lapping tool capable of use in expeditiously and accurately lapping slide valve seats in triple valves.

While I have shown the preferred form of my invention, it is to, be understood that various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A lapping tool for'lapping the slide valve seat in' a triple valve, said tool comprising an arm, a disk having a peripheral groove intermediate its surfaces, a retaining member fixed to the arm and engaging said groove but permitting an amount of relative movement between the disk and the arm, said disk having a recess formed coaxiallythereof and extending inwardly just short of its grinding surface, and a bearing inembercarried by the arm and projecting,

within said recess to bear against the bottom of the recess at the center of the disk when pressure is placed on the arm.

2.A lapping tool of the character described comprising an arm, a disk, means loosely connecting the disk to the arm, and a' bearing member carried by the arm and 'engageable with the disk, saidmeans andsaid bearing member cooperating to prevent removal ofthe disk from the'arm,

'3. A lapping'tool of the character described comprising an arm, a disk having a peripheral groove formed in its edge intermediate its top and bottom surfaces, and a retaining member carried by the arm and extending into said groove and retaining the disk against removal from the arm but permitting relative movement between the disk and the arm.

"i. A lapping tool of the character described comprising an' arm, a disk, means loosely connecting'the disk to the arm, and a bearing member carried by the arm and 'engageable with the disk at a point closely adjacent the working surface thereof, said means and said bearing member cooperating to prevent removal of the disk from the arm.

JAMES R. RICKETTS.

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