US3941102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bucket tappets
Assignee: Rover Co Ltd
•
Filing: 1974-08-16
•
Granted: 1976-03-02
•
Expires: 1994-08-16
Abstract
Abstract A poppet valve assembly for an internal combustion engine, in which a tappet foot is in screw thread engagement with the end of a valve stem; a retainer collar non-rotatably engages both the valve stem and the tapper foot; and a valve return spring acting on the retainer collar must be compressed in order to disengage the collar from the foot for adjustment of the valve operating clearance.
Inventors
- 👤 Eric Gordon Bareham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:53
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2107
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A poppet valve assembly for an internal combustion engine, having a poppet valve urged against a valve seat by a valve return spring and featuring: a. a tappet foot in screw thread engagement with the end of the valve stem and having locking formations; and b. a retainer collar non-rotatably engaged on a non-round section of the valve stem and having locking formations which inter-engage those of the tappet foot and which afford a plurality of alternative angular settings for the foot; the retainer collar being displaceable against the valve return spring in order to disengage it from the foot for adjustment of the valve operating clearance.
Claim 2
Dependent Claim
107 words
A poppet valve assembly for an internal combustion engine, having a poppet valve urged against a valve seat by a valve return spring and featuring: a. a tappet foot in screw thread engagement with the end of the valve stem and having locking formations; and b. a retainer collar non-rotatably engaged on a non-round section of the valve stem and having locking formations which inter-engage those of the tappet foot and which afford a plurality of alternative angular settings for the foot; the retainer collar being displaceable against the valve return spring in order to disengage it from the foot for adjustment of the valve operating clearance.
Claim 3
Dependent Claim
32 words
A poppet valve assembly according to claim 1, in which the retainer collar has a ring of radial locking formations concentrically inter-engaging a ring of radial locking formations of the tappet foot.
Claim 4
Dependent Claim
52 words
A poppet valve assembly according to claim 2, in which the tappet foot has an internally screw-threaded, tapered stem that nests within a complementary, tapered central-opening portion of the retainer collar, and the stem of the foot is split axially so that it can grip the thread of the valve stem radially.
Claim 5
Dependent Claim
60 words
A poppet valve assembly according to claim 2, in which the tappet foot has an internally screw-threaded, cylindrical stem the end of which abuts an annular shoulder at the bottom of a cylindrical central-opening portion of the retainer collar, and the stem of the foot is slit circumferentially so that it can grip the thread of the valve stem axially.
Claim 6
Dependent Claim
28 words
A cylinder head for an internal combustion engine, having an overhead camshaft and including a poppet valve assembly according to claim 1 arranged for actuation by the camshaft.
References Cited (Backward Citations)
US1857005A
Cited
US3301239A
Cited
US3413964A
Cited
US3675631A
Cited
US3752130A
Cited
US3880128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |