US2688183A

US2688183A - Valve seat puller

Info

Publication number: US2688183A
Application number: US205116A
Authority: US
Inventors: Alton F Oberley; Albert C Schrimshaw
Original assignee: International Harverster Corp
Current assignee: Navistar Inc
Priority date: 1951-01-09
Filing date: 1951-01-09
Publication date: 1954-09-07
Anticipated expiration: 1971-09-07

Description

Sepf- 7, 1954 A. F. OBERLEY ET AL 2,688,183

VALVE SEAT FULLER Filed Jan. 9, 1953 Il f4 y 17 l I I Z5 @nv Patented Sept. 7, 1 954 UNITED sTATrs 'TENT OFFICE VALVE SEAT PULLER New Jersey Application January 9, 1951, Serial No. 205,116

6 Claims. 1

This invention relates to tools and more particularly to extractor tools for withdrawing valveseat insert rings or the like from their counterbores in cylinder heads, cylinder blocks, or the like, of internal combustion engines.

It has become common practice to provide hardened steel rings as valve seat inserts surrounding the valve ports of internal combustion engines. These insert rings are held in their operative position by a frictional or drive t with the engine block counterbores which serve as seats for them. Inasmuch as the insert rings become worn after a period of use and must be replaced and since they are rigidly held on their seats it becomes necessary to exert a considerable amount of force to remove the deteriorated insert rings. It is, therefore, an object of the present invention to provide an inexpensive and eicient extractor tool for the removal of insert rings or the like from engine blocks.

The foregoing and other important objects and desirable features inherent in and encompassed by the invention together with many of the purposes and uses thereof, will become readily apparent from a reading on the ensuing description in conjunction with the annexed drawing, in which,

Fig. 1 is a vertical fragmentary sectional view, with parts broken away, showing the relative position of the extractor tool as it is being inserted through the insert ring to be removed;

Fig. 2 is a View similar to Fig. 1 showing the extractor tool gripping the insert ring prior to dislodgment of the ring from its counterbored seat, and

Fig. 3 is a cross sectional view taken substantially along line 3-3 of Fig. 2.

Referring to the drawing, wherein like reference characters represent like elements throughout the various views, there is shown an extractor tool having a cylindrical body portion I0. The diameter of the body portion is less than the internal diameter of the insert ring II to be pulled so that it may readily pass through the ring. The insert ring II is rigidly supported in a counterbore I2 formed in an engine block I3, partially shown in Figs. l and 2l Concentric with and below the counterbore I2 is a valvestern guide or bushing I4 of conventional type.

The lower end I5 of the body portion I0 is provided with a recess I I for `rigidly receiving the head I'I of a downwardly projecting spindle I'I. The spindle II is insertable in the bore I8 of the valve-stem guide I4, as shown in Fig. l, to center the body portion I0 and prevent trans- 2 verse relative movement of the same with respect to engine block I3. Projecting from the opposite or upper end I9` of the body portion l@ is an upwardly extending threaded shank 20 which is in longitudinal alignment with the guide spindle I'I. i

Three circumierentially spaced grooves or recesses 2l are formed in the body portion I0. Each recess 2l is dened by side walls 22 and a bottom wall 23. Pivotally supported between each pair of side walls 22 by means ofv a pivot pin 2li is a gripping pawl 25. The pawls 25 have wedge-shaped projections or teeth 26 formed thereon, the outer marginal edges 2i of which are curved and relatively sharp for a purpose which will be explained hereinafter.

Loosely fitting on the shank 2li is disk or washer 28 having three circumferentially'spaced spring legs 29 extending therefrom. The free end 30 of each leg 2Q respectively abuts the top surface 3l of one of the pawls 25 as shown in Figs. l and 2. A rotatable member 32, in the form of a nut in the present invention, is screwed on the shank 20 to maintain the spring legs 29 in abutting engagement with the pawls' 25. It will be apparent that the pawls 25 are continually urged to the expanded or gripping position illustrated in Fig. 2. The pawls 25 are prevented from pivoting downwardly beyond the expanded position by coming in contact with the bottom walls 23 of the recesses 2|.

In operation, the spindle Il is inserted into the valve-stem guide I4 and the wedge-shaped teeth 26 of the pawls 25 are brought to a point just below the insert ring II. It will be obvious that the pawls 25' will pivot inwardly to a retracted position, as shown in Fig. l, against the resilient force of the spring legs 29 as the body portion I0 is moved downwardly through the insert ring I I. By rotating the nut 32 in a direction to effect movement of the same toward the body portion I0 the yieldable force exerted by the spring legs 29 is increased and, conversely, an opposite turning of the nut will decrease the spring force. Hence, by screwing the nut 32 toward the body portion Iii after the teeth H are positioned directly adjacent the lower surface of the insert ring I I the pawls 25 are forced outwardly with a relatively greater force causing the wedge-shaped teeth 2li to engage the juncture 33 of the lower surface of the insert ring II and the counterbore I2. A wrench or other suitable means may then be used to grasp the outer end 34 of the shank 20 to rotate the body portion II) and the pawls 25 and undercut or groove the metal below the insert ring il. The undercutting procedure described above, of course, does not have to be followed if a chamfer or undercut is already provided below the insert ring Il as is customary in many internal combustion engines.

In order to effect an upward longitudinal pull on the body portion l0, an inverted U-shaped bridge-forming member 35 is slidably positioned on the shank 20 and engages the engine block I3 on diametrically opposite sides of the counterbore l2. A nut 36, threaded on the shank 26 above the bridge-forming member 35, is easily screwed downwardly against the member 35 to force the body portion l upwardly. As the body portion I0 moves upwardly the pawls 25 are expanded even further into wedging engagement with the insert ring Il to the fully expanded position shown in Fig. 2. Continued raising of the body portion I0 will withdraw the insert ring l I from the engine block.

The embodiment of the invention chosen for the purposes of illustration and description herein is that preferred as the result of selective tests based upon the requirement for achieving the objects of the invention and developing the utility thereof in the most desirable manner, due regard being had to existing factors of economy, simplicity of design and construction, and the improvements sought to be effected. It will be appreciated, therefore, that the particular structural and functional aspects emphasized herein are not intended to exclude, but rather to suggest, such other adaptations and modications of the invention as fall within the spirit and scope of the invention as dened in the appended claims.

We claim:

l. An extracting tool for removing a valve-- seat insert ring or the like from engine blocks having valve stem guides comprising a .cylindrical body portion adapted to pass through the insert ring to be pulled and having a plurality of circumferentially spaced recesses formed therein; a longitudinally disposed spindle projecting from one end of said body portion insertable in the valve stem guide to centralize said body portion; a longitudinally disposed threaded shank projecting from the opposite end of said body portion; a pawl pivotally mounted within each recess, each pawl being adapted to pivotally move between a irst position where-in a substantial portion `of said pawl projects transversely beyond the cylindrical surface of said body portion to engage the insert ring and a second position wherein a relatively small part .of the pawl extends beyond said cylindrical surface.; resilient means positioned on said shank .and engageable with said pawls for continually .urging said pawls to said nrst position, said resilient means coinprising a disk having Va plurality of depending radially spaced spring legs formed therein for abutting said pawls; stop vmeans for limiting the pivotal movement of said pawls to `establish said rst position; adjustable means for varying the yieldable force of said resilient means; .a bridgeforming element slidably mounted on said shank and adapted to bear on the engine block; and rotatable means mounted on said shank for engaging `said bridge-forming .element and being operative to longitudinally withdraw .said body portion from the engine block.

`2. An extracting tool as set forth in cla-im l in which, the major kpart of the portion .of each pawl projecting transversely beyond the .cylindrical surface of said body portion when said pawls are in said rst position is wedge-shaped and has a sharp marginal edge.

3. An extracting tool for removing a valveseat insert ring or the like from engine blocks having valve stem guides. comprising a body portion adapted to pass through the insert ring to be pulled; a spindle projecting from one end of said body portion insertable in the valve stem guide to centralize said body portion; a threaded shank projecting from the opposite end of said body portion; a plurality of pawls pivotally supported by said body portion adapted to swing between an outward position wherein said pawls engage the insert ring and an inward position wherein said pawls may pass through the insert ring; spring means positioned on said shank for continually urging said pawls to said outward position including a disk having a plurality of depending radially spaced spring legs formed therein for abutting said pawls; adjustable means for varying the resilient force of said spring means; and means operatively engaging the engine block and cooperative with said threaded shank for withdrawing said body portion from said engine block.

4. An extracting tool for removing a valveseat insert ring or the like from engine blocks, comprising a body portion adapted to pass through the insert ring to be pulled; a plurality of gripping elements pivotally supported by said body portion adapted to swing between an expanded position wherein said gripping elements engage the insert ring and a retracted position wherein said gripping elements may pass through the insert ring; spring means positioned adjacent one end of said body portion and abutting said gripping elements for continually urging said gripping elements to saidexpanded position said spring means including a disk having a plurality of depending radially spaced legs formed therein for engaging said gripping elements; adjustable means for varying the resilient force of said spring means; and means .operatively engaging the engine block and said body portion for withdrawing said body portion from said engine block.

5. An extracting tool as set forth in claim 4 in which, each gripping element has a wedgeshaped tooth formed thereon provided with a curved, sharp marginal edge.

16. An extracting tool for removing a valveseat insert ring or the like from .engine blocks having valve stem guides -comprising a cylindrical body portion adapted to pass through the insert ring to be pulled and having a plurality of circumferentially spaced recesses formed therein; a longitudinally disposed spindle projecting from vone end of vsaid body portion insertable in the valve stem guide to .centralize 4said body portion; .a longitudinally Adisposed threaded shank projecting from the oppOSite end of said body portion; a pawl pivotally mounted within each recess, each pawl being adapted to pivotally move between a drst position wherein a substantial portion .of said pawl projects transversely beyond the cylindrical surface of said body portion to engage the insert ring .and a second position wherein a relatively small part of the pawl extends .beyond said cylindrical surface; resilient means ,positioned .on said shank and engageable with .said pawls for .continually urging said pawls to said rst position, said resilient means ,comprising .a disk 4having a plurality of ,depending radially .spaced spring legs Vformed therein for 5 6 abutting said paWls; stop means for limiting the References Cited in the file of this patent pivotal rnovement of .said paWls to establish said UNITED STATES PATENTS rst posltlon including a Wall of each recess; adjustable means for varying the yieldable force Number Name Date of said resilient means; a bridge-forming ele- 5 1,466,976 Tlfacy Sept-4,1923 ment slidably mounted on said shank and 13991032 Rledesel n June 24% 1924 adapted to bear on the engine block; and rotat- 1376376 Blackman Sept- 30 1930 able means mounted on said shank for engaging 2,257,318 Wllbom Sept- 30 1941 said bridge-forming element and being operative 2430347 Klrk et al- NOV 11 1947 to longitudinally withdraw said body portion 10 FOREIGN PATENTS fwm the engme block' Number Country Date 195,169 Great Britain Mar. 29, 1923