US4040763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and fixture for reaming piston pin bushings in connecting rods
Assignee: Individual
•
Filing: 1975-10-28
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Granted: 1977-08-09
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Expires: 1995-10-28
Abstract
Abstract The invention discloses a fixture for holding the connecting rod from an internal combustion engine for the purpose of precision reaming the bushing in the piston pin end of said connecting rod. The fixture is uniquely adaptable to various connecting rod lengths by simply rotating an eccentric member to an appropriate index position. Various crankshaft diameters can be accommodated by the use of appropriate adapter sleeves on the eccentric bushing. Different size piston pin diameters may be accommodated by simply inserting the proper reamer guide bushing and use of an appropriate diameter conical centering bushing. Additional holes also can be provided in an indexing plate member of the fixture to extend the range of connecting rod lengths that can be handled with the fixture. The fixture is also adapted to be made with a blank indexing plate member, which can be drilled by the user for various connecting rod lengths.
Inventors
- 👤 Gerhard Assenmacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:20
CPC Classifications
B; B23; B23B; B23B41/00; B23B41/12; Y; Y10; Y10S; Y10S408/00; Y10S408/707; Y10T; Y10T408/00; Y10T408/03; Y10T408/55; Y10T408/557
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
193 words
A fixture for reaming piston pin bushings in connecting rods comprising an elongated base member having support column means secured to one end thereof and at least one reamer guide bushing mounting means on the remaining end thereof; rotatable eccentric means mounted on said support column means supporting the crankshaft journal end of a connecting rod to be reamed; indexing means supported on said base member and including detent means coacting with means providing different predetermined fixed rotational positions for said rotatable eccentric means for setting and fixedly detaining said rotatable eccentric means in a selected one of a number of different predetermined fixed rotational positions, said detent means being readily adjusted to set said rotatable eccentric means in a precise easily reproduced manner to any selected one of said number of different predetermined fixed rotational positions whereby said fixture readily and with precision can be adjusted to accommodate different length connecting rods; and locking means securing a connecting rod to be reamed in position on said fixture with the crankshaft journal end thereof supported on said rotatable eccentric means and the piston pin end centered over the reamer guide bushing mounting means.
Claim 2
Dependent Claim
193 words
A fixture for reaming piston pin bushings in connecting rods comprising an elongated base member having support column means secured to one end thereof and at least one reamer guide bushing mounting means on the remaining end thereof; rotatable eccentric means mounted on said support column means supporting the crankshaft journal end of a connecting rod to be reamed; indexing means supported on said base member and including detent means coacting with means providing different predetermined fixed rotational positions for said rotatable eccentric means for setting and fixedly detaining said rotatable eccentric means in a selected one of a number of different predetermined fixed rotational positions, said detent means being readily adjusted to set said rotatable eccentric means in a precise easily reproduced manner to any selected one of said number of different predetermined fixed rotational positions whereby said fixture readily and with precision can be adjusted to accommodate different length connecting rods; and locking means securing a connecting rod to be reamed in position on said fixture with the crankshaft journal end thereof supported on said rotatable eccentric means and the piston pin end centered over the reamer guide bushing mounting means.
Claim 3
Dependent Claim
36 words
A fixture according to claim 1 further including a plurality of interchangeable bushing sleeves designed to fit over the rotatable eccentric means for adapting the rotatable eccentric means to different connecting rods crankshaft end journal diameters.
Claim 4
Dependent Claim
64 words
A fixture according to claim 1 wherein said rotatable eccentric means comprises a cylindrically-shaped eccentric member rotatably secured on the support column means for rotation about an off-center axis whereby rotation of the member around the off-center axis produces an eccentric effect, the eccentric member having a cylindrically-shaped upper portion designed to journal the crankshaft journal end of a connecting rod to be reamed.
Claim 5
Dependent Claim
48 words
A fixture according to claim 3 further including a plurality of interchangeable cylindrical-shaped bushing sleeves of different wall thicknesses desgined to fit over the upper end of the rotatable eccentrically mounted-cylindrical-shaped eccentric member for adapting the rotatable eccentric member to accommodate different connecting rod crankshaft end journal diameters.
Claim 6
Dependent Claim
88 words
A fixture according to claim 1 wherein said indexing means comprises a circular-shaped replaceable indexing plate member secured on said support column means adjacent the rotatable eccentric means and having a plurality of openings therein arrayed around its periphery for alignment with a coacting opening in the rotatable eccentric means, and said detent means comprises replaceable pin means coacting with the opening in the rotatable eccentric means and an aligned opening in the indexing plate member for firmly locking the rotatable eccentric means in a desired rotational position.
Claim 7
Dependent Claim
100 words
A fixture according to claim 4 wherein said indexing means comprises a circular-shaped replaceable indexing plate member of greater diameter than said rotatable eccentric member and secured on said support column means adjacent the rotatable eccentric member, said indexing plate member having a plurality of openings therein arrayed around its periphery for alignment with a coacting opening in the rotatable eccentric member, and said detent means comprises replaceable pin means coacting with the opening in the rotatable eccentric member and an aligned opening in the indexing plate member for firmly locking the rotatable eccentric member in a desired rotational position.
Claim 8
Dependent Claim
72 words
A fixture according to claim 3 wherein said locking means comprises a circular-shaped locking plate member of comparable diameter to the cylindrically-shaped eccentric member and having an off center axial opening through which a threaded stud passes that is secured to the support column means for rigidly clamping the circular-shaped locking plate member in place over a connecting rod crankshaft journal end seated on the cylindrically-shaped upper portion of the eccentric member.
Claim 9
Dependent Claim
71 words
A fixture according to claim 6 wherein said locking means comprises a circular-shaped locking plate member of comparable diameter to the cylindrically-shaped eccentric member and having an off-center axial opening through which a threaded stud passes that is secured to the support column means for rigidly clamping the circular-shaped locking plate member in place over a connecting rod crankshaft journal end seated on the cylindrically-shaped uppper portion of the eccentric member.
Claim 10
Dependent Claim
61 words
A fixture according to claim 1 wherein the reamer guide bushing mounting means mounts reamer guide bushings of different diameter and further including a plurality of different diameter, conically-shaped centering guide bushings for use in precisely centering the piston pin end of connecting rods having different piston pin end journal diameters over a reamer guide bushing mounted in the base member.
Claim 11
Dependent Claim
61 words
A fixture according to claim 8 wherein the reamer guide bushing mounting means mounts reamer guide bushings of different diameter and further including a plurality of different diameter, conically-shaped centering guide bushings for use in precisely centering the piston pin end of connecting rods having different piston pin end journal diameters over a reamer guide bushing mounted in the base member.
Claim 12
Dependent Claim
59 words
A fixture according to claim 5 wherein said circular-shaped indexing plate member in addition to the peripherally arrayed openings for the locking pin also includes peripheral areas of blank spaces for accommodating additional openings to be drilled by a user of the fixture to thereby allow the fixture to be adapted for use with connecting rods of non-standard lengths.
Claim 13
Dependent Claim
59 words
A fixture according to claim 10 wherein said circular-shaped indexing plate member in addition to the peripherally arrayed openings for the locking pin also includes peripheral areas of blank spaces for accommodating additional openings to be drilled by a user of the fixture to thereby allow the fixture to be adapted for use with connecting rods of non-standard lengths.
Claim 14
Dependent Claim
41 words
A fixture according to claim 1 wherein there are a plurality of reamer guide bushing mounting means formed in the elongated base member with each reamer guide bushing mounting means being centered a different radial distance from the support column means.
Claim 15
Dependent Claim
41 words
A fixture according to claim 12 wherein there are a plurality of reamer guide bushing mounting means formed in the elongated base member with each reamer guide bushing mounting means being centered a different radial distance from the support column means.
Claim 16
Dependent Claim
46 words
A fixture according to claim 5 wherein the peripheral areas of said circular-shaped shoulder member are entirely blank to allow a user of the fixture to drill openings at desired peripheral points whereby the fixture can be adapted for use with connecting rods of any length.
Claim 17
Independent Claim
358 words
A method of reaming the piston pin bushing of connecting rods utilizing a fixture comprising a base plate having an eccentric member rotatably secured on a support column at one end and a reamer guide bushing of suitable dimension at the other end; indexing means supported on the base member and including detent means coacting with means providing different predetermined fixed rotational positions for said rotatable eccentric member for setting and fixedly detaining the rotatable eccentric member in a selected one of a number of different predetermined fixed rotational positions whereby the fixture readily and with precision can be adjusted to accommodate different length connecting rods; and locking means including a locking plate and locking nut; said method comprising: placing one end of the fixture in a vise; rotating the eccentric member relative to the indexing means to accommodate a particular length connecting rod placing said detent means in means defining said one of a number of fixed rotational positions; fitting the crankshaft journal end of the connecting rod on the support column over the eccentric member; fitting an adapter sleeve bushing on said eccentric member (if required) to adapt the eccentric member to accommodate the diameter of the connecting rod crankshaft end journal; setting said adapter sleeve bushing, connecting rod, and eccentric member only finger tight into rough aligned position with a locking plate and nut to bring the center axis of the piston pin end bushing of the conecting rod roughly into alignment with the center axis of the reamer guide bushing; inserting a reaming tool through the piston pin end bushing to be reamed, through a conical centering guide bushing and into the reamer guide bushing; locking the said connecting rod rigidly in place on the eccentric member with the center axis of the piston pin end bushing in accurate axial alignment with the center axis of the reamer guide bushing by turning down the locking nut on the locking plate with a wrench; removing the reaming tool and the conical centering guide bushing; and thereafter reinserting the reaming tool and reaming out the piston pin end bushing of the connecting rod with high precision.
Claim 18
Independent Claim
358 words
A method of reaming the piston pin bushing of connecting rods utilizing a fixture comprising a base plate having an eccentric member rotatably secured on a support column at one end and a reamer guide bushing of suitable dimension at the other end; indexing means supported on the base member and including detent means coacting with means providing different predetermined fixed rotational positions for said rotatable eccentric member for setting and fixedly detaining the rotatable eccentric member in a selected one of a number of different predetermined fixed rotational positions whereby the fixture readily and with precision can be adjusted to accommodate different length connecting rods; and locking means including a locking plate and locking nut; said method comprising: placing one end of the fixture in a vise; rotating the eccentric member relative to the indexing means to accommodate a particular length connecting rod placing said detent means in means defining said one of a number of fixed rotational positions; fitting the crankshaft journal end of the connecting rod on the support column over the eccentric member; fitting an adapter sleeve bushing on said eccentric member (if required) to adapt the eccentric member to accommodate the diameter of the connecting rod crankshaft end journal; setting said adapter sleeve bushing, connecting rod, and eccentric member only finger tight into rough aligned position with a locking plate and nut to bring the center axis of the piston pin end bushing of the conecting rod roughly into alignment with the center axis of the reamer guide bushing; inserting a reaming tool through the piston pin end bushing to be reamed, through a conical centering guide bushing and into the reamer guide bushing; locking the said connecting rod rigidly in place on the eccentric member with the center axis of the piston pin end bushing in accurate axial alignment with the center axis of the reamer guide bushing by turning down the locking nut on the locking plate with a wrench; removing the reaming tool and the conical centering guide bushing; and thereafter reinserting the reaming tool and reaming out the piston pin end bushing of the connecting rod with high precision.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |