US1511564A

US1511564A - Cylinder-lapping tool

Info

Publication number: US1511564A
Application number: US590490A
Authority: US
Inventors: Edward S Karstens
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-09-25
Filing date: 1922-09-25
Publication date: 1924-10-14
Anticipated expiration: 1941-10-14

Description

et M 159240 E. s. KARSTENS CYLINDER LAPPING TOOL Filed Sept. 25

ATTORNEY lll Patented oct. 14, 1924.v

UNITED STATES EDWARD S. KARSTENS, O'F DAVENPORT, OWA..

CYLINDERFLAPPING TOOL.

Application filed September 25, 1922. Serial No. 590,490.`

To all whom t 'may concern.'

Be it known that EDWARD S. KARSTENS, a citizen of the United States, residing at Davenport, in the county of Scott and State of iowa, has invented certain new and useful Improvements 1n Cylinder-Lapping Tools, of which the following is a specification.

My invention relates to improvements in appliances for lapping in cylinders of internal combustion engines and similar nuses and may also be used for grinding such cylinders.

The objects of my invention are, first, to provide a cylinder lapping tool which can be utilized for grinding E -head and T-head motors with a head cast integral with the cylinder block; second, to provide a cylinder lapping tool for grinding valve-inhead cylinders where there. is a very small clearance at the head end of the cylinder; third, to provide means by which Ithe blocks of abrasive material in the lapping tool are firmly held and to control the feed of such blocks and maintain the blocks parallel to the longitudinal axis of the body ofthe lapping tool and Ito provide for a` graduatedfeed of such blocks.

I attain these objects by the mechanism illustrated in the accompanying drawings, in \\'hioh,-

Figure 1 represents a side elevation of my lapping appliance showing the upper half thereof in section on the middle line; Fig. 2 is a plan view of one of the stoneholders: Fig. S is a side elevation of one of the stoneholders; Fig. 4 is an end elevation thereof; Fig. 5 is a longitudinal section of the adjusting screw; Fig. 6 is an end view of the adjusting screw; Fig. 7 is an end view of the larger end of the body of the tool with the stoneholders and inner collar removed; Fig. 8 is an end view of the inner collar and front end of the appliance; Fig. 9 is a side elevation of the inner collar showing the bevelled face in dotted lines; Fig. 10 shows a side velevation of the rear or exterior collar with the inner lines thereof shown in dotted lines; Fig. 11 is an inner end View of the external collar; Fig. 12 is a plan View and Figure 13 is a longitudinal section of the spring.

l( refer to the right end of Figure 1 as the front end of the appliance and the left end of Figure 1 as the rear end of the appliance. i

Similar numerals refer Ito similar parts tl'iroughout the several views.

The body of my device comprises a tapered shank, la, with a body portion, 1, formed integral therewith.

The body is cylindrical, but has a plurality of longitudinal channels, 5, cut or otherwise formed in it. The front end of 'the body is bevelled or tapered to correspond to the internal bevel or t-aper of the front collar, 6, which is a circular collar surrounding the shank and smaller end of the body of the appliance and may be secured inplace by set screws as shown in Figure or otherwise. i

Stoneholders, 2, corresponding inwidth and length to the channels, 5, are seated in said channels. The rear end of each stoneholder, 2, is shaped to correspond with the internal taper of the collar, 6. rlhe rear end of each stoneholder has an outwardly projecting portion corresponding in height to the outwardly projecting portion at the front end and the internal faces of these projecting portions are bevelled to enable fthem to retain the grinding or lapping stones, A3. rlhe front end of each stoneholder also has an inwardly projecting portion, 12, formed integral therewith, although slightly narrower than the outer portion and the inwardly projecting portion, 12, has its inner face bevelled or tapered to correspond to the bevel or taper, of the face, 11, ofthe rear end of the stoneholdeny but with this difference, that the face of the rear end, l1, is curved laterally to lit the internal taper of the collar, 6, while the bevelled face of the projecting portion, 12, is preferably made fiat to fit a corresponding fiat-loottomed channel, 15, in the side of the internal collar, 14.

The channel, 5a, is formed in the inwardly projecting portion, 12, of the front end of each stoneholder adapted to receive a head, 9. of an adjusting screw, 7.

The adjusting screw, 7, is threaded to Et into a threaded central opening in the body, 1, and the threaded screw, 7, is preferably formed with a hexagonal key Seat. formed in the head end thereof adapted to receive 'a ke by which the screw, 7, can turned.

As t e screw, 7, is turned, the head, e, not

body when the screw is turned in one direction and when turned in the opposlte d1- f rection, the stoneholders are pressed outwardly by the fiat springs, et, one of which is mounted in each channel, 5, of the body of the tool. A pin, 17, is secured in a closely fitting hole or opening in the middle of each stoneholder adapted to enter a corresponding opening, 18, in the middle of the adjacent sprlng, 4. I have shown a flat spring in the drawings as my preferred form, having its ends bearing against the stoneholder near the ends thereof and its middle portion bearing against the bottom of its corresponding channel, 5, but it is obvious that other forms of springs maybe used toeiiectthe same purposes.

The front end of the body, 1, is provided with a circular opening large enough to receive the collar, 414, and a small space is left between the threaded screw, 7, and the surrounding portions of the inwardly extending ends of the stoneholders, 2.

lIn a lapping appliance adapted to grind or lap cylinders of approximately three inches in diameter, I prefer to provide sufficient space ttor inward and outward movement of the stoneholders of approximately three-eighths of an inch, but this space may be varied to suit the requirements of each particular case and to meet requirements for different sized cylinders, it being preferable to have a number of lapping tools to correspond to different standard sizes of cylinders rather 'than to allow too large a limit of adjustment for each particular tool.

In the operation of my device, the shank, 1a is mounted in the tool holder of an engine lathe, boring mill or other suitable machine. The cylinder to be lapped or Aground is then adjusted to the desired diameter and the work proceeded with in the ordinary way.

The lapping stones may be varied in granular structure to meet the requirements ot each particular case. Where a large amount of material is to be taken out, it is preterable to use coarser stones for the first cut or two and it desired, stones may be used ot such a tine grain as to merely true up and polish the interior of the cylinders without effecting any material cutting away of stock.

It is obvious that my device may be used for either wet or dry grinding, but for many classes of work, I prefer to use oil as it will procure a smoother cut and finish than could otherwise be obtained. Y

In practice, I prefer 'to secure the stones in place in the stoneholders by leading them in, butit is obvious that they may be secured in place by any other suitable means.

The size and proportions of my appliance may be varied to meet the requirements of each particular case without departing from the spirit of my invention. In the case of large cylinders, where there" is suilicient room, the number of channels and stoneholders may be increased and in smaller sized cylinders, it may be reduced to three or two if desired. The collar, 14, may be formed integral with the body, 1, but is easier to manufacture if formed separately.

I claim: V

1. In a lapping tool al cylindrical body having a shank at one end formed integral therewith, an internally tapered collar secured to the body adjacent the shank, aA

cylindrical seat formed in the opposite end of the body and a collar seated therein tapered internally at an angle to correspond to the internal taper of the collar adjacent the shank and stoneholders having 'extensions engaging the collars with tapers corresponding to the taper of the collars.

2. In a lapping -tool a. cylindrical body having a shank at one end' formed integral therewith, an internally tapered collar secured to the body adjacent the shank, a cylindrical seat formed in the opposite end of the body and a collar seated` therein tapered internally at an angle to correspond to the internal taper of the collar adjacent the shank and, stoneholders having extensions engaging the collars withtapers corresponding to the taper of the collars, said stoneholders being secured in longitudinal channels formed in the body 'of the appliance.

3. In a lapping tool a cylindrical body having a shank at the end formed integral therewith, an internally tapered collar secured to the body adjacent the shank. a cylindrical seat formed in the opposite end of the body land a collar seated therein tapered internally at an angle to correspond to the internal taper of the collar adjacent the shank, stoneholders having extensions engaging the collars with tapers .correspending to the taper of the collars, an adjusting screw threaded into a longitudinal opening in the center of the body and means tor transmitting the longitudinal motion ot thc adjusting screw to the stoneholders.

4. In a lapping tool a cylindrical body having a shank at one end formed integral therewith, an internally tapered collar secured to the body adjacent the shank, a cylindrical seat formed in the o posite end oi' the body and a collar seated therein tapered internally at an angle to correspond to the internal taper of the collar adjacent the shank, stoneholders having 'extensions engaging the collars with tapers corresponding to the taper of the collars and an adjusting reinseriscrew threaded into a longitudinal opening in the body of the appliance and having a head projecting into the grooves or channels formed in inwardly projecting portions of the stoneliolders.

5. ln a lapping tool a cylindrical ybodyv having a shank at one end formed integral therewith, aninternally tapered collar secured to the body adjacent the shank, a cylindrical seat formed inthe opposite end of the body and a collar seated therein tapered internally at an angle to correspond to the internal taper of the collar adjacent the shank, stoneholders having extensions en-.'

gaging the collars with tapers corresponding to the taper of the collars, said stoneholders being secured in longitudinal channels formed in the body of the appliance and a spring seated in the bottom ot' each channel with its ends bearing against the holder and ijtsv intermediate portion bearing against the ody.

6. ln a lapping tool, a cylindrical body having arshank at one end formed integral therewith, an internally tapered collar secured to the body adjacent the shank, a cylindrical seat formed in the opposite end of' the body and a collar seated therein tapered internally at an angle to correspond to the internal taper of the collar adjacent the shank, stoneholders having extensions engaging the collars with tapers corresponding to the taper of the collars, said stoneholders being secured in longitudinal channels formed in the body of the appliance, an adjusting screw threaded into a longitudinal opening in the center of the body, means for transmitting the longitudinal motion of the adjusting screw to the stoneholders, and a spring seated in the bottom of each channel with its ends bearing against the holder and its intermediate portion bearing against the body. 7. In a tool for lapping and grinding cylinders, the combination with a plurality of abrasive blocks mounted in suitable holders, of projecting ends formed upon said holders carrying similarly taperedv portions, said holders being secured in longitudinal channels formed in the body of the appliance, collars secured at each end of the body having internally tapered faces corresponding to the tapered portions of the holders, an adjusting screw threaded into a longitudinal opening in the'body of the appliance and means operatively connecting the adjusting screw with the holders.

8. ln a tool for lapping and grinding cylinders, the combination with a plurality of abrasive blocks mounted in suitable holders,

of projecting ends formed upon said holders vnels formed in the body of the appliance.,

collars secured at each end of the body ot the appliance having internally tapered Vfaces corresponding to the tapered portions of the holders, an adjusting screw threaded into a longitudinal opening in the body of the appliance, means operatively connecting the adjusting screw with the holders, a spring seated in the bottoni of each channel with its ends bearing against the adjacent holder and its intermediate portion bearing against the body, and a pin or lug securing each spring to its adjacent holder.

9. ln a tool for lapping cylinders. the combination with a plurality of stoneholders, each stoneholder having one end tapered longitudinally and its opposite end provided with an inward extension carrying a similarly tapered portion, ot collars secured to the body of the tool and having internally tapered faces corresponding to the tapered portions of the stoneholders, means for adjusting the position of the stoneholders longitudinally upon the tapered faces ot the collars4 and a plurality of springs mounted upon the body of the tool bearing outwardly against the stoneholders respectively.

10.` ln a cylinder lapping and grinding appliance, the combination with a body having an internally tapered seat formed therein and an internally tapered collar portion secured thereto, of stoneholders carryin projecting portions tapered to correspon with the tapers of the seat and collar and adapted to engage the seat and collar rej EDWARD S. KARSTENS.