US1943895A - Glaze breaking tool for gas engine valve seats - Google Patents

Description

Jan. 16, 1934. w. J. KATTREIN v GLAZE BREAKING TOOL FOR GAS ENGINE VALVE SEATS Filed July 12, 1930 INVENTO-R William Jlfalirez'n WATTORNEY Patented Jan. 16, 1934 UNITED STATES PATENT OFFICE GLAZE BREAKING TOOL FOR GAS ENGINE VALVE SEATS Application July 12, 1930. Serial No. 467,396

6 Claims.

This invention relates broadly to improvements in valve reseating tools and more particularly to an improved tool for preparing gas engine valve seats for subsequent finishing operations.

An object of the invention resides in the provision of a glaze breaker tool for breaking up and removing the hardened surface metal from the valve seats of engines that have become hardened and worn from use.

A prominent feature of the invention, is to provide a tool of the type specified, having radially and longitudinally adjustable and readily removable seat abrasive units of semi-cylindrical semitubular construction for presenting convex ,abrasive surfaces to the glaze to facilitate the glaze removal.

Structural features present in the glaze breaker tool consists of a solid head having a central bore and a conical face provided with channel precision seats or grooves to receive one or both legs of semi-tubular file units capable of being adjusted to compensate for wear, and means for locking the file units in adjusted positions in said grooves.

Another feature resides in the semi-tubular breaker files which may be file cut on the convex or outer surface and may also be tapered from end to end.

In the accompanying drawing I have illustrated different embodiments of my invention relative to the means for holding the breaker files in clamped operative position on the head, and I reserve the right to change the construction as may be required for various conditions of use, within the scope of the invention claimed.

The several views of the drawing may be described as follows:

Fig. 1 is a side elevation of my improved glaze breaker tool, the adjustability of a breaker-file being indicated by dot and dash lines.

Fig. 2 is a bottom face view of the tool.

Fig. 3 is a bottom face view of the head with the breaker-files removed.

Fig. 4 is a side view of a breaker-file.

Fig. 5 is an end view thereof.

Fig. 6 is a detail fragmentary section taken on the line 6-6 of Fig. 2.

Fig. 7 is a view similar to Fig. 6 but showing a modified form of breaker-file clamping means.

Fig. 8 is a similar view but showing a further modified form of breaker-file clamping means.

Referring to the drawing, 10 designates a preferably circular solid head of cold rolled steel, which is formed with a conical under face 11, and a central slightly tapered bore 12, to receive a handled spindle (not shown) for manipulating said head, as by back and forth rotation. The head is further provided with tangential channel seats or grooves 13, and a corresponding number of tapped sockets 14, for the reception of screws or bolts 15, having flat heads adapted to contact with one side or leg 1'? of semi-tubular breakerfiles or file bars 16, to lock that side or leg in adjustable engagement with the bottom of said grooves 13, the opposite leg edge of each of said breaker-files 16 resting on the conical face 11 of the head 10, for precision, as shown in Fig. 6

of the drawing. The legs of the breaker-files and the bottoms of said grooves are plane and flat to provide precision contact, thus offering no undesirable movements of the breaker-files when locked in operative position.

By referring to Fig. 2 of the drawing it will be seen the grooves 13 and clamping screws 15 are so positioned that the longitudinal axes of the breaker-files are in registration with the axis of the head 12, in other words, the said breakerfiles are truly radial to the center of the head; but I may place the said breaker-files at other angles relative to the center of the head 10 if desired, or if found advisable. The plain leg or flange 17 constitutes a holding portion or handle for the file 16.

By tapering the grooves 13, and also the file bars, from their outer to their inner ends, as seen best in Figs. 1 and 4, said bars may be moved further inwardly, or towards the axis of the head, so that even the extreme outer ends of the file cut surfaces may be used. The files are therefore cut away, in part, at their inner ends, although the full area of the filing surfaces is maintained throughout the length of the files. In Fig. 7 of the drawing I show a modified form in which the head 10 may be provided with a broad channel 20 for each of the breaker-files 16, both edges of both legs of said files resting fiat therein for precision, and one leg being interlocked with a clamp screw 21; and in Fig. 8 I show a further slight modification, in which I employ double grooves 22, for each breaker-file 16, to receive both leg edges thereof, a screw 23, being in clamping engagement with one of said leg edges.

The radial adjustment of the breaker-files is accomplished by reason of the side angular contour or tapering of said files, as best disclosed in Fig. 4, the flat faces of the base of the legs at one side, operatively resting on the bottoms of said grooves and the opposite leg base face resting on the conical portion of the head, for precision. -l10 What I claim is:

1. In combination, a circular head having a central tapered bore, a conical face having tangentially extending grooves and adjacent threaded sockets semi-tubular, breaker-files partially resting in said grooves and partly on said conical face, said breaker-files having convex abrasive faces; and devices in said threaded sockets for locking said breaker-files in said grooves.

2. A glaze breaker for gas engine valve seats, consisting of a head having therein a plurality of grooves, concavo-convex file units adjustable on said head, each unit having one side resting on said head and the opposite side resting in one of said grooves, and means coacting with said grooves for holding said concavo-convex file units in operative position.

3. A glaze breaker for gas engine valve seats, embodying a head having a conical face and tangential grooves therein; semi-tubular file units each mounted with one side resting on said face and the other side resting in one of said grooves, and means for locking said units to said head.

4. A glaze breaker of the class described embodying a supporting head having a central bore and of frusto conical cross sectional contour, the conical face thereof being formed with tangential grooves having flat bottoms, cross sectionally curved semi-tubular file bars secured to said head with one side leg of each bar resting fiat on the bottom of each groove and with the opposite side legs of each bar resting fiat on the conical face of the said head adjacent said grooves thereby providing precision seats for each bar, and means for securing said bar to said seats.

5. A glaze breaker for valve seats including in combination a conical head having an axial bore, said head having radially disposed grooves in its conical surface, files slidably mounted in said grooves and having tapered inner ends whereby to secure increased inward movement thereof, and means for securing said files in selected positions.

6. A glaze breaker for valve seats including in combination a conical head having an axial bore, said head having radially disposed grooves in its conical surface, said grooves having flat boundary faces, files movably mounted in said grooves and having tapered inner ends whereby to secure increased inward movement thereof, said files including convex abrasive surfaces and having fiat faces which slidably engage the first mentioned faces, and means for securing said files in selected positions.

WILLIAM J. KATTREIN.

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