US1393625A - Tool for grinding internal cylindrical surfaces - Google Patents

Description

J. R. HOBBS. TOOL FOR GRINDING INTERNAL CYLINDRICAL SURFACES." 1,393,625.

APPLICATION FILED 111N515 I920:

Patented Oct. 11, 1.921.

Fla. 7.

FIGS

I I i I? ii I? H I i I r.. v

' Latches.

UNITED STATES PATENT OFFICE.

JOHN nonnnr noses, or LONDON, ENGLAND.

I Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed June 15, 1920. Serial N0.889,192.

To all whom it may cmwem:

Kensal Rise, London,

.Be it known that 1,-J0HN ROBERT Hours, a; British subject, residin at 21 Buller road,

ngland, have invented certain .new and useful 1m rove- Inents in-To'ols =for Grinding. Internal ylindrlcahsunfaces, of which the following is a specification.

lfiflhisxinvention relates to a new or improved tool primarily intended for grinding thecyl-inders of'internal combustion engines either for the purpose of removing scores or ridges, or in connection .with the fitting oi over-size pistons.

The invention is, how even-applicable generally-for grinding internal cylindrical surfaces.

Theinvent'ion is illustrated in the accompanying drawing. in which Figure 1 shows an underside view of Fig 1, Fig. 3 is an elevation of the cage, Fig. 4. is an elevation of the cutting-stone, Fig. 5 is a plan of the cage,:Fig. 6 is a plan of the cutting stone,

-' .Fi-g; 7 is a plan and Fig. 8 is an edge view of the retaining washer.

According to' the preferred form of the invention, the improved tool comprises a central body 1 of solid material, generally cylindrical in-shape, but provided with two or more dove-tailedslots 2 of which three are shown in dottedlines in Fig. 2, the slots being arranged axially the whole length of the cylinder. The body is centrally bored and the lower face is provided with an integral circular flange 3, Fig. 2.

The dove-tailed slots are adapted to house correspondingly formed cages, i, Figs. 3 and 5, each adapted to receive a. carborundum or similar cutting stone 5, Figs. 4 and 6, the stones being urged outwardly by springs 6 partly housed in sockets 7 in the ca es.

The walls 8 of the cages are provi ed with slots 9 forming inturned flanges 10 adapted to engage with flanges 11 formed on the stones; both flanges extend to the upper end of thecages but are interrupted close to the lower end to form a stop for the retention of the stones. The cages are shouldered at the lower end as shown in order to receive a washer 12, Figs. 7 and 8 which registers with and is attached to the lower end of the body by screws and forms an abutment for the cages. The body is mounted on a central spindle 13, of which the head 14 is shown in Fig. 2 seated within the flange 3, and is locked thereon by means of a wing nut15 and washer 16.

It is apparent from the construction above described that the grinding stones cxtend'the full length of the body and that thereby the grinding action may readily reach the extreme end of the cylinder, and furthermore the cooperation of the cages and body is such as to permit the association with the body of cages of diiierent sizes, as ma be necessary in use with cylinders of di ferent bores.

In use the tool may be operated either by a hand brace or drill, or set up in a lathe or drilling machine. One convenient mode of'operation consists in mounting it in a pillar drilling-machine the cylinder being bolted to a stand:

It is intended to provide with each tool cages of varying sizes to suit cylinders of varying dlameters putside the limits to which the range of'adjustment provided by the springs 6 in the form shown is accommodated.

I claim 1. A tool for grinding internal cylindrical surfaces, comprising a body, cages held in ways formed in the body, ber secured to the lower end of the body, the cages being recessed to receive the abutment member, and a grinding stone slidably held in each ca e and normally projected toward the artic e being ground.

2. A tool for grinding internal cylindrical surfaces, comprising a body, cages held in ways formed in the body, an abutment member secured to the lower end of the body, the cagesbeing recessed to receive the abutment member, a grinding stone for each cage having projections, the cages having flanges to cooperate with said projections to limit movement of the stones in one direction, and springs bearing between cages and stones to project the stones toward the article being ground.

3. A tool for grinding internal cylindrical surfaces, comprising a body, cages held in ways formed 1n the body, an abutment member secured to the lower end of the body, the cages being recessed to receive the abutment member, and a grinding stone slidably held in each cage and normally projected toward the article being ground. a spindle having a head housed within an opening in, said. abutment member, and

an abutment memmeans carried by said spindle and body to secure the spindle in fixed relation to the body.

4. A tool for grinding internal cylindrical surfaces comprising a body formed with dove-tailed ways extending t roughout the length thereof, cages arranged for cooperation with thebody and each comprising a projection to fit within a dove-tailed way in the body, walls extending from the project-ion to provide a receiving member, and a grinding stone arranged in the receiving member and adapted for movement radially of the body.

5. A tool for grinding internal cylindrical surfaces comprising a body, cages held in ways formed in the body, an abutment member secured to the lower end of the body, the cages being recessed to receive said member and beyond the recess extending to the extreme lower end of the tool, and a grinding stone removably supported in each cage,

id stone being of the full length of the the sa cage.

6. A tool for grinding internal cylindrical surfaces, comprising a body formed with vertically extending dove-tailed ways, cages having parts to cooperate with said ways a and hollow extensions from said parts, the parts making the ways being of less length than the hollow extensions to provide recesses at the rear of the cages, an abutment secured upon the lower end of the body and fitting in said recesses to hold the cages in place at the lower end, removable means to secure the cages with relation to the body at the upper end, and a grinding stone mounted in each hollow extension of each cage and movable radially with respect to the body.

7. A tool for grinding internal cylindrical surfaces, comprising a body formed with vertically extending dove-tailed Ways, cages having parts to cooperate with said we s.

than the ho low extensions to provide rec'esses at the rear of the cages, an abutment securedupon the lower end of the body and littm-g 11153111 recesses to hold the cages in place at the lower end, removable means to secure the cages with relation to the body at the upper end, and a grinding stone mounted m each hollow extension of each cage and movable radially with respect to the body, saldgrinding stones being of the full length of the hollow extensions of the cages and equaling the full length oi the body and abutment. t

v 8. A tool for grinding internal cylindrical surfaces; comprising a body formed with vertically extending dove-tailed ways, cages havlng parts to cooperate withsaid ways and hollow extensions-from said parts, the

parts making the ways being of; less length than the hollow extensions to provide recesses at the rear of the cages, an abutment secured upon the lower end of the body-and fitting in said "recesses to hold the cages in place. at the lower end, removable means to secure the cages with relation to the body at the upper end, and agrinding stone mounted in each hollow extension of each cage andmovahle nadiallywith respect to the body, the hollow extension of each 0 being formed with recesses closed at- E: outer ends, and the grinding stones-having ribs to slidably seat in said recesses, andsprings to normally project the grinding stones to the limits of said recesses:

In testimony whereof-I afiix my si atnre.

, JOHN ROBERT HO BS.

Images