Patent US3700343A successfully refreshed from Google Patents.
US3700343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing oil grooves in valve guides
Assignee: Ingenious Devices Ltd
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Filing: 1971-02-08
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Granted: 1972-10-24
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Expires: 1991-02-08
Abstract
Abstract An apparatus for cutting an oil groove into a valve guide in a cylinder head. The apparatus includes bracing means for supporting the head with the combustion chambers either up or down, a feed body rigidly held against the cylinder head, and a rotary oil-grooving tool which is screw-fed down through a splitnut in the feed body and which has a tubular boring member with a tool bit which enters the guide and inscribes a helical oil groove on its interior wall.
Inventors
- 👤 John Parry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03432; B23B29/03446; B23B29/03453; B23B5/00; B23B5/36; B23B5/46; B23B5/48; Y; Y10; Y10S; Y10S82/00; Y10S82/902; Y10T; Y10T408/00; Y10T408/55; Y10T408/557; Y10T408/558; Y10T408/5583; Y10T408/83; Y10T408/85; Y10T408/858; Y10T408/8588; Y10T409/00; Y10T409/30; Y10T409/304424; Y10T409/306216; Y10T409/306384
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
An oil grooving apparatus for cutting an oil groove into the interior wall of a valve guide in the head of an engine which includes a valve seat concentric with said valve guide, said apparatus comprising: support means for supporting said head, an oil-grooving tool including a tubular boring member dimensioned to fit snugly but slidably within said valve guide, and a coaxial cylindrical feed screw which is fixed with respect to said tubular boring member and which is exteriorly threaded, a feed body adapted to be positioned firmly against the head and having split nut means selectively engageable with said feed screw, whereby rotation of the oil-grooving tool when engaged within the split nut causes the oil-grooving tool to advance with respect to the feed body, a tool holder in said tubular boring member mounted for radial movement therewithin but restrained against longitudinal and rotational movement with respect thereto, a tool bit mounted in said tool holder, an actuating rod mounted within said oil-grooving tool and longitudinally movable therewithin, the actuating rod having a cam contact with said tool holder whereby movement of the actuating rod toward said tool holder pushes the tool holder radially outwardly and thus causes the tool bit to engage the interior wall of the valve guide, and movement of the actuating rod away from said tool holder permits the tool holder and the tool bit to withdraw radially inwardly, and means for rotating said oil-grooving tool.
Claim 2
Dependent Claim
242 words
An oil grooving apparatus for cutting an oil groove into the interior wall of a valve guide in the head of an engine which includes a valve seat concentric with said valve guide, said apparatus comprising: support means for supporting said head, an oil-grooving tool including a tubular boring member dimensioned to fit snugly but slidably within said valve guide, and a coaxial cylindrical feed screw which is fixed with respect to said tubular boring member and which is exteriorly threaded, a feed body adapted to be positioned firmly against the head and having split nut means selectively engageable with said feed screw, whereby rotation of the oil-grooving tool when engaged within the split nut causes the oil-grooving tool to advance with respect to the feed body, a tool holder in said tubular boring member mounted for radial movement therewithin but restrained against longitudinal and rotational movement with respect thereto, a tool bit mounted in said tool holder, an actuating rod mounted within said oil-grooving tool and longitudinally movable therewithin, the actuating rod having a cam contact with said tool holder whereby movement of the actuating rod toward said tool holder pushes the tool holder radially outwardly and thus causes the tool bit to engage the interior wall of the valve guide, and movement of the actuating rod away from said tool holder permits the tool holder and the tool bit to withdraw radially inwardly, and means for rotating said oil-grooving tool.
Claim 3
Dependent Claim
38 words
The invention claimed in claim 1, in which said actuating rod frictionally maintains itself in a given position longitudinally of the oil-grooving tool, longitudinal displacement of the actuating rod taking place upon the exertion of adequate axial force.
Claim 4
Dependent Claim
100 words
The invention claimed in claim 1, in which the support means is adapted to support said head with the valve guide substantially vertical and the valve seat downward, said actuating rod being frictionally engageable longitudinally within said oil-grooving tool and extending beyond the location of the tool bit within the tubular boring member, the said apparatus further comprising an adjustable stop member adapted to be positioned beneath the head in line with the actuating rod, such that longitudinal movement of the oil grooving tool with respect to the valve guide brings the actuating rod into contact with the stop member.
Claim 5
Dependent Claim
73 words
The invention claimed in claim 1, in which the tool holder has a plane cam surface sloped at substantially 15* to the axis of the tubular boring member, the plane cam surface being exhibited toward the feed screw, and in which the actuating rod has a complementary cam surface adapted to slide in surface contact with said plane cam surface whereby the tool holder can be moved radially of the tubular boring member.
Claim 6
Dependent Claim
19 words
The invention claimed in claim 1, which further comprises hold-down means for firmly positioning the feed-body against the head.
Claim 7
Dependent Claim
144 words
The invention claimed in claim 1, in which the support means for supporting the head comprises: a head stand which includes a cross-rail adapted to rest against the table of a drill-press, and a cylindrical portion extending perpendicularly from the cross-rail; a valve seat insert having a conical surface adapted to contact the valve seat concentric with a valve guide and a tubular extension adapted to fit snugly within the valve guide; the head stand further including a rod coaxial with said cylindrical portion and adapted to extend through said tubular extension and said valve guide to terminate in a threaded end above the engine head when the latter is being supported by said support means, and nut means adapted to be threaded onto said threaded end into tight engagement with the engine head, thereby to clamp the engine head to the head stand.
Claim 8
Dependent Claim
60 words
The invention claimed in claim 6, in which the said nut means is a further head stand having a cross-rail adapted to rest against the table of a drill-press, and a cylindrical portion extending perpendicularly from said last-mentioned cross-rail, the latter having coaxially within said last-mentioned cylindrical portion a threaded bore adapted to receive said threaded end of the rod.
Claim 9
Dependent Claim
65 words
The invention claimed in claim 7, in which the rod is longitudinally displaceable with respect to said first-mentioned cross-rail between a first position and a second position, the said threaded end being closer to the first-mentioned cross-rail when the rod is in said first position than it is when the rod is in said second position, and means biasing the rod toward said first position.
References Cited (Backward Citations)
US2461436A
Cited
US3333487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |