US1643459A

US1643459A - Cylinder-honing device

Info

Publication number: US1643459A
Application number: US758073A
Authority: US
Inventors: Johnson William
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-12-26
Filing date: 1924-12-26
Publication date: 1927-09-27
Anticipated expiration: 1944-09-27

Description

Sept. 27, 1927. 1 3,459 W. JOHNSON CYLINDER HONING DEVICE Filed Dec. 26. 1924 3 Sheets-Sheet l Inu Qnfov B LQl\\\am Johnson 1,643,459 Sept. 27, 1927- JQHNSON CYLINDER HONING DEVICE Filed D60. 26 1924 I 3 Sheets- Sheet 2 1 I0 z a Lgi.

l2. l5 In a Mov minim Johnson Sept. 27, 1927.

. 1,643,459 W. JOHNSON CYLINDER HONING DEVICE Filed Dec. 26. 1924 6 Sheets-Sheet 3 UJHham Johnson Patented Sept. 27, 1927.

PATENT OFFICE.

wILLIm common, or nusxnoon acron ms, mrcn'rean.

, CYLINDER-BORING. DEVICE.

' Application and December 20, 1924. Serial No. m;

'This 'iinvention relates to cylinder honing devices and particularly to'those of. the type adaptedto perform the finishing or polish ing operation upon the interior of engine cylinders and the like.

It is customary, in the manufacture of en gmes and other devices having cylinders with pistons to reci rocate therein, to produce a smooth polis ed interior surface on the cylinder after it has been bored and reamed. This final operation is commonly known as lapping or honing and is er formed bythe use of afine abrasive. any

methods of honing have been used and tools for the purpose have been contrived. but owing to the fact that the'abras'i-vestones commonly used with honing devices wear away rapidly in use, it has been found difiicult to provide an easy means of adjustment to compensate for the wearing away of the stones, bothto maintain a constant contact with the cylinder walls as the device is used and also tomaintain a perfect alignment so that the interior of the cylinder will be true and accurate when the operation is finished. Other disadvantages of honing devices that have been used are that no simple and con- Venient means has beenprovided to retract the abradi-ng stones to enter them into the cylinder at the beginning of the operation and it has alsobeen found that the stones are apt to bind and catch as they are rotated in the cylinder causing them to chatter and resulting in an uneven surface on the cylinder.

It is the object of this invention to overcome the above described difficulties and disadvantages and also to provide various other novel features of construction and arrangement in the honing device hereinafter more fully described and particularly pointed out in the claims, reference being had to the accompanying drawings in which,

Fig. 1 is a vertical elevation of a honing device embodying this invention.

Fig. 2 is a vertical axial section of the same.

Fig. 3 is a transverse section onthe line 3-3 of Fig. 2 showing the abrading stones locked in retracted position. i

Fig. 4 is a transverse section on the'line 4-4 of Fig. 2 illustrating the position of the driving elements when the stones are in retracted position.

5 is a section similar to Fig. 3 showmg t e stones extended to bear against the inner surface of a cylinder. Q *FIg. 6 is a section similar to Fig. 4 showing the position of the driving elements when'the stones are extended and the device is bem rotated, and

.F 1g. is a perspective view showing some of the essentlal parts of the apparatus in partially disassembled position, some of the parts being shown in section and others with parts broken away.

4 Like numbers refer to like parts in all of the figures of the drawings. I Themain body member of the device comprises a hub 1 substantially triangular in cross sectlon and being provided at its respectlve upper and lower ends with integrally formed

flanges

2 and 3. A central hole 4 extends completely through. the hub and is axially located. The abrading stones 5, three of which are provided in the structure disclosed, are each mounted upon a swinging arm 6 and the arms are located between the flanges. 2 and 3 and pivoted upon bolts 7 which extend through the flanges. In order that the stones may be readily removed and replaced when they are worn out they are detachably connected to their respective arms by providing a dovetail tongue 8 upon each stone. and as a matter of expediency in manufacture, it has been found desirable to cover the face of the stone with a coating of lead 9 which may be more accurately formed into dove-tail shape than the stone itself and which also provides a stronger construction. tail member of the stone fits within a dove tail groove upon the arm 6 and a clamping bar 10 provided with screws 11 is used to hold the stone in place upon the arm.

- Each of the arms 6 of the stone at its swinging end is normally thrust outward by a spring 12 which surrounds the bolt 7 and bears at one end against the hub and at the other end against the inner surface of the arm 6. i a

In order to cause all of the arms 6 to move outward or inward from the hub uniformly and in synchronism and also as a means of retaining the stones in retracted position, each arm is provided with a connecting rod 13 which extends from the inner surface of each arm near its verticalcenter and passes The dovethrough one of the three slots 14 provided in the hub 1. lVithin the central opening 4 in the hub 1 the crank shaft 15 is located and it is provided with three slots 16 one above the other, each of which receive the inner end of one of the connecting rods 13.- T he inner ends of the connecting rods are pivotally attached by. pins 17 to the said crank shaft 15, said points of attachment being eccentrically located. In. the present structure where three arms and connecting rods are used the inner ends of connecting rods are spaced one hundred and twenty degrees apart about the center of the shaft.

The slots 16 are cut deep enough into the shaft so that the connecting rods therein may swing to a position to 1ock the stones in retracted position as illustrated in Fig. 3. This locking action is caused by the pins 17 swinging past the center of the shaft before the connecting rods strike the bottoms of the slots.

It will be seen that by the above described construction all of the arms 6 are connected to the common crank shaft 15 and must move inward or outward simultaneous as the shaft rotates within the huh I and also that when the arms are fully retracted they are locked in that position by. reason of the inner ends of the connecting rods 13 swing ing slightly past the center of the crank shaft. The retracting of the. arms may be done either by rotating the crank shaft 15 or by compressing one or more of the arms which will cause the crank shaft to rotate.

This device is adapted to be mounted for operation in a machine having a rotating spindle with a chuck thereon to receive the driving shank 18 whereby the whole structure will be rotated. The shank 18 extends into the cap 19 at the upper end of the structure and is provided with the flange 20 which has the transverse groove 21 in its lower face. A boss 22 extends upward from the surface of the flange 2 over which the cap 19 fits and two diametrically opposite lugs 23 project upward within the cap from the boss 22. A disk 24 is interposed between the lugs 23 and the flange 20 and the disk is provided with the

tongues

25 and 26 on its respective upper and lower surfaces, said tongues being disposed at right angles to each other. The tongue 25 extends into the groove 21 and the tongue 26 projects downward into the'plane of the lugs 23 and is adapted to engage the lugs to rotate the I body of the structure when the disk is rotated by the shank 18. The lugs 23 are made relatively small so that considerable slack motion is provided for the tongue 26, whereby it may rotate approximately ninety degrees from its engagement with the lugs in one position before it engages the lugs in another position. The interposing of the di k 24 With its right angularly disposed rotated backward to retract and lock the arms carrying the stones and also to release the stones from retracted position when the" device is rotated-in the direction for operatmg as hereafter described.

The operating rotation of the device isthat indicated by the arrows in Figs. 4 and 6, being such as to pull the arms upon the pivot bolts 7 so that they will trail and draw smoothly against the surface upon which they operate. In using the device the arms carrying the stones are retracted to the position shown in Fig. 3 whereat the device may readily be inserted into the cylinder 28 to be operated upon. In this position the driving shank 18 is rotated backward, as shown in Fig. 4, until the tongue 26 engages the lugs 23 in the reverse position and the pins 27 on the crank shaft 15 straddle the tongue and extend in front of the driving surfaces of the lugs 23. hen the device has been inserted into a cylinder 28 and the shank 18 started to rotate in its driving direction the tongue 26 is caused to first engage the pins 27 and rotate the shaft 15 sufiiciently to unlock the connecting rods 13 by swinging the crank pins beyond the center of the shaft, whereat the springs '12 act to swing the arms 6 outwardly and engage the stones 5 with the surface of the cylinder 28. As the shank 18 continues to rotate the tongue 26 will engage the driving surface of the lugs 23 and rotate the whole structure.

It will be seen that the arms 6 being mounted to trail behind the pivot pins 7 during operation, the stones 5 will be drawn smoothly over the surface of the cylinder completely obviating any tendency of the stones to chatter. The arms carrying the stones are caused to move outwardly in unison therefore causing the stones to wear evenly and as they wear they are retained constantly in contact with the surface operated upon by the outward thrust of the springs 12 and no manual adjustment to compensate for wear is required. Should the cylinder to be operated upon not be exactly aligned with the driving spindle in a which the shank 18 is mounted, the sliding coupling between the shank and the body member will compensate for the'misalignment and allow the device to rotate evenly in the center of the cylinder. By providing means for locking the stones in retracted position and also means for automatically unlocking the stones to allow them to be extended and engage the cylinder wall, the

mounted upon the body member and adapted to swing outwardly therefrom, springs to swing the abrasive members outwardly, a connecting rod extending from the mner side of each abrasive member and each -attached at its inner end to said crank shaft, whereby the abrasive members are caused to spring in unison, the inner portions of said connecting rods adapted to swing across the center of the crank shaft when the abrasive members are fully retracted whereby the abrasive members are locked in retracted 'position, and common means for rotating the body member and the crank shaft, said r0- tating means being adapted to rotate the crank shaft a portion of a revolution before the body member is rotated.

2. A honing device comprising, a rotatable body member having an axial opening, a

plurality of abrasive members pivotally mounted thereon adapted to swing outwardly, springs to swing the abrasive members outwardly, a crank shaft located in the axial opening of the body member, a connecting rod attached to each abrasive member and extending into the body member, the inner end of each connecting rod being eccentrically connected to the crank shaft and the inner portion of each connecting rod adapt ed to swing across the center of the crank shaft when the abrasive members are. fully retracted whereby the abrasive members are locked in retracted position, two diametrically opposite driving lugs projecting upwardly from the body member, a driving member having a tongue extending between and adapted to engage the driving lugs, said tongue having slack motion between the lugs, and pins projecting upwardly from the crank shaft to straddle the said tongue whereby a partial rotation of the crank shaft is imparted by the tongue prior to the engagement of the tongue with the driving lugs.

3. A honing device comprising, a rotatable body member having an axial opening, a crank shaft located in said opening, two diametrically opposite driving lugs extending upwardly from the body member, a disk having a tongue on each of its respective upper and lower sides, said tongues being disposed at right angles to eachother and the lower tongue lying between the driving lugs and having slack motion therebetween, a driving shank having a slot in its lower end to receive the upper tongue on said disk, two pins extending upwardly from said crank shaft at opposite sides of said lower tongue to impart a partial rotation to the crank shaft prior to engagement of the tongue with the driving lugs, a plurality of arms pivotally attached to said body member, an abrasive stone detachably contongue and adapted, by rotation of thenected to the swinging end of each arm,.

springs to swim the arms outwardly, and a connecting ro attached to each arm and extending into the body member, the inner end of each connecting rod being eccentrically connected to said crank shaft and the inner portion of each connecting rod adapted to swing across the center of the crank shaft when the arms are fully retracted.

4. A honing device comprising a rotatable body member having an axial opening, a crank shaft located within said opening, a plurality of abrasive members mounted on said body member and adapted to move outwardly therefrom, yieldablemeans to thrust the abrasive members outwardly, a connecting rod connected to each abrasive member and extending through the body member, the inner end ofeach connecting rod being eccentrically attached to the said crank shaft and the inner portion of each connecting rod adapted to move across'the center of said crank shaft when the abrasive members are fully retracted.

5. A honing device comprising, a rotatable body member, a plurality'of abrasive members pivotally attached to the body member and adapted to swing outwardly therefrom, a locking member rotatable relative to the body member, and a connecting rod attached to each pivoted abrasive member and eccentrically attached to the locking member whereby the ends of the connecting rods attached to the locking member may be swung, by rotation of the locking member relative to the body member, across the common axis of the device to retain the abrasive members against outward movement.

6. A honing device comprising, a rotatable body member, a plurality of abrasive members pivotally attached to the body member and adapted to swing outwardly therefrom, springmeans to swing the abrasive members outwardly, means for locking the abrasive members in retracted position against action of said spring means, driving means for rotating the body member and associated with said locking means, and means for automatically unlocking the abrasive members from retracted posit1on upon rotation of the body member by said driving means.

7. A honing device comprising, a rotatable body member, a plurality of abrasive members pivotally mounted upon the body memher and adapted to swing outwardly therefrom, springs to swing -the abrasive members outwardly, means for causing the abrasive members to swing in unison, means for 5 locking the abrasive members in retracted position against action of said springs, driving means for rotating the body member and associated with said locking means, and means for unlocking the abrasive members from retractedpositlon upon rotation of the 10 body member by said driving means.

In testimony whereof I aflix my signature.

WILLIAM JOHNSON.