Valve guide boring fixture

Claim 2

A portable tool for the reworking of valve guides of an internal combustion engine adapted to be mounted on and supported from a cylinder head from said engine during said reworking comprising: a post; first and second guide arms mounted on said post, said arms extending from said post so as to form in combination with said post a generally U-shaped structure; means mounted at a distance spaced from said post on said first arm for engaging a valve seat on said cylinder head, said valve seat engaging means including an axial bore adapted to guide valve guide reworking tools, said valve seat engaging means being pivotally moveable with respect to the arm on which it is mounted to permit said axial bore to be moved into axial alignment with the valve guide; means mounted at a distance spaced from said post on said second arm for engaging the spring seat corresponding to said valve seat; and means for altering the distance between said engaging means and for locking said valve seat engaging means in position with respect to said cylinder head once the bore thereof has been axially aligned with the valve guide; said axial bore in said valve seat engaging means having a size mating with and receiving an at least partially tapered, generally rectilinear, alignment tool extending therethrough and through said springseat engaging means in said second arm; said alignment tool adapted to extend through, be pivotally adjusted via said valve seat engaging means with respect to, and engage the least worn portion of the side walls of the valve guide corresponding to said valve seat in said cylinder head intermediate the ends of said valve guide when said portable tool is mounted on said cylinder head; the contact of said valve seat engaging means with said valve seat and said alignment tool with said valve guide providing a spaced, two-point contact for axially aligning said portable tool with said valve seat and guide such that other reworking tools may be used to rework said valve guide via said axially aligned portable tool following the removal of said alignment tool therefrom.

Claim 3

A portable tool in accordance with claim 1 wherein said valve seat engaging means on said first guide arm include a ball swivel guide having an axial hole bored therethrough, said ball swivel guide being swivelly moveable in a correspondingly shaped aperture in said first guide arm such that said axial alignment with said valve guide to facilitate said reworking of the valve guide may be attained.

Claim 4

A tool in accordance with claim 2 wherein said ball swivel guide includes a spherical portion and a cylindrical extension formed integrally therewith along an axis of said spherical portion, said ball swivel guide having an axial hole bored centrally therethrough along the common axis of said spherical portion and said cylindrical extension; said cylindrical extension also including an annular collar formed integrally therewith at the end opposite said spherical portion.

Claim 5

A portable tool for the reworking of valve guides of an internal combustion engine adapted to be mounted on and supported from a cylinder head from said engine during said reworking comprising: a post; first and second guide arms mounted on said post, said arms extending from said post so as to form in combination with said post a generally U-shaped structure; means mounted at a distance spaced from said post on said first arm for engaging a valve seat on said cylinder head, said valve seat engaging means including an axial bore adapted to guide valve guide reworking tools, said valve seat engaging means being pivotally moveable with respect to the arm on which it is mounted to permit said axial bore to be moved into axial alignment with the valve guide; means mounted at a distance spaced from said post on said second arm for engaging the spring seat corresponding to said valve seat; and means for altering the distance between said engaging means and for locking said valve seat engaging means in position with respect to said cylinder head once the bore thereof has been axially aligned with the valve guide; said valve seat engaging means on said first guide arm including a ball swivel guide having an axial hole bored therethrough, said ball swivel guide being swivelly moveable in a correspondingly shaped aperture in said first guide arm such that said axial alignment with said valve guide to facilitate said reworking of the valve guide may be attained; said ball swivel guide including a spherical portion and a cylindrical extension formed integrally therewith along an axis of said spherical portion, said ball swivel guide having an axial hole bored centrally therethrough along the common axis of said spherical portion and said cylindrical extension; said cylindrical extension also including an annular collar formed integrally therewith at the end opposite said spherical portion; said valve seat engaging means on said first guide arm also include a boring guide received in the axial bore of said ball swivel guide, said boring guide comprising a hollow tube having one end formed to receive a wrench, the opposite end threaded, and an annular collar formed integrally about said tube intermediate said ends, said collar forming a stop preventing the further insertion of said boring guide in said ball swivel guide, the outside diameter of said tube formed to match the inside diameter of said hole in said ball swivel guide and the inside diameter of said tube corresponding to the outside diameter of the various tools utilized to rework said valve guides.

Claim 6

A portable tool for the reworking of valve guides of an internal combustion engine adapted to be mounted on and supported from a cylinder head from said engine during said reworking comprising: a post; first and second guide arms mounted on said post, said arms extending from said post so as to form in combination with said post a generally U-shaped structure; means mounted at a distance spaced from said post on said first arm for engaging a valve seat on said cylinder head, said valve seat engaging means including an axial bore adapted to guide valve guide reworking tools, said valve seat engaging means being pivotally moveable with respect to the arm on which it is mounted to permit said axial bore to be moved into axial alignment with the valve guide; means mounted at a distance spaced from said post on said second arm for engaging the spring seat corresponding to said valve seat; and means for altering the distance between said engaging means and for locking said valve seat engaging means in position with respect to said cylinder head once the bore thereof has been axially aligned with the valve guide; said valve seat engaging means on said first guide arm including a ball swivel guide having an axial hole bored therethrough, said ball swivel guide being swivelly moveable in a correspondingly shaped aperture in said first guide arm such that said axial alignment with said valve guide to facilitate said reworking of the valve guide may be attained; said ball swivel guide including a spherical portion and a cylindrical extension formed integrally therewith along an axis of said spherical portion, said ball swivel guide having an axial hole bored centrally therethrough along the common axis of said spherical portion and said cylindrical extension; said cylindrical extension also including an annular collar formed integrally therewith at the end opposite said spherical portion; said valve seat engaging means on said first guide arm also include a boring guide received in the axial bore of said ball swivel guide, said boring guide comprising a hollow tube having one end formed to receive a wrench, the opposite end threaded, and an annular collar formed integrally about said tube intermediate said ends, said collar forming a stop preventing the further insertion of said boring guide in said ball swivel guide, the outside diameter of said tube formed to match the inside diameter of said hole in said ball swivel guide and the inside diameter of said tube corresponding to the outside diameter of the various tools utilized to rework said valve guides.

Claim 7

A portable tool in accordance with claim 4 wherein said boring guide has a length sufficient to reach closely adjacent the valve guide end closest to said valve seat in said cylinder head, when said tool is properly in position on said head, such that support is provided for said reworking tools closely adjacent said end of said valve guide.

Claim 8

A portable tool in accordance with claim 5 wherein said annular collar on said ball swivel guide includes securing means which cooperate to secure said boring guide in said cylindrical member.

Claim 9

A portable tool in accordance with claim 6 wherein said securing means comprise a lever biased to remain in contact with an annular recess formed in said boring guide such that said boring guide is held in position within said ball swivel guide unless said lever is withdrawn from said recess.

Claim 10

A portable tool in accordance with claim 5 wherein said threads on said boring guide are adapted to receive a valve seat adaptor, said adaptor being generally cylindrical with a hole bored along the axis thereof, said hole threaded to receive said threaded end of said boring guide, said adaptor also having at least one beveled edge to correspond to the beveled sides of a valve seat on a cylinder head of an internal combustion engine.

Claim 11

A portable tool in accordance with claim 8 wherein said engaging positioning and guiding means on said second guide arm includes a spring seat adaptor comprising an adapter cylinder having a hole bored at least partially therethrough along the axis of said cylinder, said hole being large enough iN diameter to approximately locate said spring seat adaptor on a valve spring seat of a cylinder head of an internal combustion engine, said spring seat adaptor also including a coaxial cylindrical extension formed integrally with said adaptor cylinder having an outside diameter of less than both the diameter of said adaptor cylinder and said hole bored partially through said adaptor cylinder, said outside diameter corresponding to the interior diameter of a hole bored through said second guide arm to receive said coaxial cylindrical extension, said cylindrical extension having a hole bored coaxially therethrough, which hole has an inside diameter larger than the diameter of the various tools utilized to rework said valve guides, said hole connecting with said hole bored partially through said adaptor cylinder.

Claim 12

A portable tool in accordance with claim 9 wherein said means for altering the distance between said engaging means comprise said first guide arm slideably mounted on said support post.

Claim 13

A portable tool in accordance with claim 10 wherein said support post includes an annular flange formed integrallly therewith at one end to prevent said first guide arm from sliding off said post and a slot formed longitudinally along said post in which a spring is mounted to bias said first guide arm toward said second guide arm, said first guide arm including securing means to secure said first guide arm at various positions along said post, said second guide arm being fixedly mounted on the end of said post opposite said annular flange.

Claim 14

A portable tool in accordance with claim 11 wherein said tools for the reworking of said valve guides utilized with said portable tool include a tapered alignment tool provided to align said engaging means on said first and second guide arms with said valve guide, said alignment tool being tapered from a portion at one end, having a diameter corresponding to the inside diameter of said boring guide, to a diameter less than the diameter of the original valve guide at the opposite end; a socket wrench for tightening said portable tool in place on said cylinder head corresponding to the end of said boring guide formed to receive said wrench, said wrench including an enlarged head to facilitate said tightening and a hole bored axially through said wrench such that said reworking tools may be passed therethrough; and a reamer having an outside diameter corresponding to the inside diameter of said boring guide.

Claim 15

The tool as set forth in claim 15 which further comprises means for effecting axial alignment of said axial bore and the least worn portion of the valve guide to be reworked.

Claim 16

The tool as set forth in claim 15 which includes a continuous bore through said guide arms and said engaging means whereby reworking tools may be inserted into a valve guide to be reworked at one extremity thereof and removed from the other extremity thereof while said tool is in position on the cylinder head.

Claim 17

A portable tool for the reworking of valve guides of an internal combustion engine adapted to be mounted on and supported from a cylinder head from said engine during said reworking comprising: a post; first and second guide arms mounted on said post, said arms extending from said post so as to form in combination with said post a generally U-shaped structure; means mounted at a distance spaced from said post on said first arm for engaging a valve seat on said cylinder head, said valve seat engaging means including an axial bore adapted to guide valve guide reworking tools, said valve seat engaging means being pivotally moveable with respect to the arm on which it is mounted to permit said axial bore to be moved into axial alignment with the valve guide; means mounted at a distance spaced from said post on said second arm for engaging the spring seat corresponding to said valve seat; and means for altering the distance between said engaging means and for locking said valve seat engaging means in position with respect to said cylinder head once the bore thereof has been axially aligned with the valve guide; one of said guide arms being slideably mounted on said post and which further comprises selectively manipulatable means for preventing such sliding movement.

Claim 18

A portable tool for the reworking of valve guides of an internal combustion engine adapted to be mounted on and supported from a cylinder head from said engine during said reworking comprising: a post; first and second guide arms mounted on said post, said arms extending from said post so as to form in combination with said post a generally U-shaped structure; means mounted at a distance spaced from said post on said first arm for engaging a valve seat on said cylinder head, said valve seat engaging means including an axial bore adapted to guide valve guide reworking tools, said valve seat engaging means being pivotally moveable with respect to the arm on which it is mounted to permit said axial bore to be moved into axial alignment with the valve guide; means mounted at a distance spaced from said post on said second arm for engaging the spring seat corresponding to said valve seat; and means for altering the distance between said engaging means and for locking said valve seat engaging means in position with respect to said cylinder head once the bore thereof has been axially aligned with the valve guide; one of said guide arms being slideably mounted on said post and which further comprises selectively manipulatable means for preventing such sliding movement.

Claim 19

The tool as set forth in claim 15 wherein said locking means comprises means for forcibly varying the distance between one of said arms and one of said engaging means.

Claim 20

The tool of claim 15 wherein said first arm is slideably mounted on said post; said post including means for biasing said first arm toward said second arm and means for clamping said first arm to said post in selected positions therealong.