US1799109A - Grinding machine - Google Patents

Description

GR I mama MACHINE nlei Aug. 29 1928 '5 Sheets-Sheet 1 INVENTOR mass QHL /ne,

ATTORNEY March 31, 1931. c. H. LYNE GRINDING MACHINE Filed Aug. 29, 1928 3 Sheets-Sheet 2 5aaSEES555555??? INVENTOR WlTNESS ATTORN EY March 31, 1931. c. H. LYNE 1,799,109

GRINDING MACHINE Filed Aug. 29, 1928 5 Sheets-Sheet 3 INVENTOR wwuzss afl y ATFORNEY Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE CHARLES H. LYN E, OF MIAMI, FLORIDA eanmme MACHINE Application filed August/29, 1928. Serial No. 302,824.

My invention relates to grinding machines,

and moreparticularly to a portable machine for use in conjunction with manhole casings and their covers.

Further, the invention provides a machine wherebyemanhole casings and covers therefor may expeditiously ground or polished to permit the cover to seat accurately within the manhole casing.

This invention also contemplates a grinding or polishing machine which is adjustable to bring a rotating abrasive element into desired position and which. is capable of traversing the work to reach any point about its circumference.

Anotherobject of the invention is to provide'a rotary work support for use in connection with my improved grindin machine when it is desired to grind or polis circular objects such as manhole covers.

With the preceding and other objects and advantages in mind, the invention consists in the combination of elements constructions and arrangements of parts and operations to be hereinafter specifically referred to, claimed and illustrated in the accompanying drawings wherein Figure 1 is a side elevation of the inven-' tion in operative position on a manhole cas: e; 7

Figure 2 is a to plan view of the same;

Figure 3 is a orizontal sectional view taken on line 33 of Figure 1;

Fi ure 4 is a vertical section taken on substantlally the plane -4-4 indicated on Figure 2;

Figure 5 is a side elevation of a modification of the invention.

Figure 6 .is a top plan view of the work holder;

Fi re 7 is a transverse section taken line -7 of Figure 6.

Referring to the invention in detail, and more particularly to the construction disclosed in Figures 1-4 inclusive, a circular trackway 5 is provided and is adapted to be positioned on the npperedge of a manhole casing 6. Set screws 7 are carried by the trackway for securing the latterto the manhole casing being operated on A substantially semi-circular carriage or casting 8 is arranged above the trackway 5 and carries a plurality. of radially disposed flanged rollers 9, the latter being mounted on lugs 10 depending from the under face of the carriage. For the purpose of rotating the carriage on the trackway, the carriage is provided with an opening 11 in its periphery for the reception ,.O. ,.a--handle or suitable implement. Li a A suitable electric moto'r 12 is mounted on the carriage with its shaft 13 extending v-ertically and projecting downwardly below thecarriage and carries a circular abrasive element 14 on its lower end. In abrasive element is adapted to grind or polish practice, the

the usual manhole casing-cover seat provided I forwardly projecting part of the anglebracket is provided with a horizontally disposed dove-tail groove 16 which is closed at its forward end. Mounted within this groove is a horizontally arranged screw 17, the latter projecting beyond the angle bracket and carries a hand grip 18. Arranged to one side of the forwardly projecting part of the angle bracket is a vertically arranged plate 19 provided with a dove-tail tongue 20 upon its inner face which is receivedin the groove 16.

The dove-tail tongue 20 is provided with an internally threaded horizontally disposed bore 21 through which the screw 17 passes so that upon rotation of this screw, the .plate 19 will be shifted in a horizontal direction.

The outer face of the plate 19 is formed with a vertically extending dove-tail groove 22 and journaled in this plate and passing through the groove '22 is a screw 23 having a hand'grip 24 at its upper end. 'A block. s

or casting 25 is arranged in advance of the plate 19 and is formed with a dove-tail tongue 26 provided with a vertically disposed in-Q ternally threaded bore 27 through which the screw 23 passes. The block or casting 25 terminates in laterally projecting plates or flanges 28 to which the ends of the motor 12 are bolted or otherwise secured as at 29.

A'suitable conductor 30 leads to the motor for carryingelectrical energy from any desirable source While a suitable switch 31 is attached directly to the motor casing for controlling the flow of electrical energy to the motor.

It will beobserved that the abrasive element may be adjusted vertically and laterally to bring the same in contact with the work. With the motor in operation the carriage is manually rotated slowly so that the abrasive element will contact with the entire area of the seat of the manhole casing to remove all uneven surfaces therefrom.

For the purpose of grinding manhole casing covers, the construction disclosed in Figures 5-7 inclusive is provided. In this construction, the manhole cover is retained in an inverted position on a circular turn-table 32 carrying a central vertical shaft 33 revoluble in a bearin 34 arising from a horizontally disposed base plate 35. The turn table is provided with an upstanding annular flange 36 of less height than the height of the manhole cover so that the surface of the latter will project above the flange as illustrated. Pairs of radially disposed perforated ears 37 are formed on the outer face of the flange, any pair of which is adapted to be engaged by a lever or implement when it is desired to rotate the turn-table.

In order to adjust the manhole cover to the desired position for grinding, a plurality of radially disposed blocks 38 is disposed upon the bottom of the turn table at the edges of the latter and have their under faces bevelled as at 39. These blocks are adjustable over inclined surfaces 40 on the bottom of the turntable by means of hand operated screws 41, one of which is swivelled to each of the blocks. It will be manifest that upon adjustment of the blocks, the manhole cover resting thereon as disclosed in Figure 7, will be raised to the desired height. 1

After the manhole cover has been adjusted to the desired height, it is securely heldv against movement by means of set screws 42 passing transversely through the annular flange 36. I

In order to make use of the portable grinder disclosed in Figures 14 inclusive, a base plate 43 is mounted to one side of the turn-table and arising therefrom is a substantially semi-circular casting 44 which projects above the turn-table and manhole cover contained therein. When using the portable grinder for grinding manhole covers, the flanged rollers 9 are arranged on the casting 44 with two of the rollers at the ends of the latter. Upstanding plates 45 are-carried by the ends of the casting and project in thepath of the rollers to retain the grinder against rotation. To further stabilize the grinder on the casting an anchor bolt 46 passes vertically through a central opening 47 in the carriage and is anchored tothe base plate 43;

With the abrasive element in operation as above stated, the turn-table is slowly rotated to bring the surface of the manhole cover in contact with the abrasive element.

I claim:

1. In a grinding machine, a circular track to be mounted-directly upon a circular body to be operated upon, a carriage rotatable on the trackway, and an abrasive element associated with the carriage and adapted to contact With the work as the carriage is rotated.

2. In a grinding machine, a circular trackway to be applied upon one end of a circular body to be operated upon, a carriage arranged above the trackway, rollers carried by the carriage and movable on the trackway, and an abrasive element mounted on the carriage and adapted to contact with the work as the carriage is rotated.

, 3. In a grinding machine, a circular trackway to be applied upon one end of a circular body to be operated upon, a carriage arranged above the trackway, rollers carried by the carriage and movable on the trackway, and an abrasive element mounted on the carriage and adapted to contact with the work as the carriage is rotated, and means for adjusting the abrasive element to the surface to be ground.

4. In combination a circular trackway to be mounted directly on a circular body to be operated on, a carriage movable on the trackway, a vertically andlaterally adjustable motor mounting carried by the carriage, a motor attached to the mounting, and a surface finishing element fixed to the motor shaft.

Si ned at Miami, in the county of Dade and State of Florida, this 24th day of August, 1928.

CHARLES H. LYNE.

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