US3869803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill guide for enlarging engine valve stem guides
Assignee: PETERSON MACHINE TOOL Inc
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Filing: 1973-12-17
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Granted: 1975-03-11
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Expires: 1993-12-17
Abstract
Abstract A drill guide for enlarging the valve stem guides of internal combustion engines when said guides become worn, in order to permit the insertion of a shim sleeve of the desired accurate internal bore, consisting of a guide bar adapted to be positioned over a line of said guides, a series of at least three blocks carried by the bar for adjustable movement therealong, and fixable thereon at any desired position, and a pilot rod carried by each of the blocks, the pins being parallel with each other and normal to the bar, and adapted to be received in the valve stem guides, at least one of the pilot rods being carried removably in a drill bushing fixed in its associated block.
Inventors
- 👤 Merle E Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
B; B23; B23B; B23B47/00; B23B47/28; B23B2215/00; B23B2215/24; Y; Y10; Y10T; Y10T408/00; Y10T408/96; Y10T408/98
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
266 words
A drill guide for guiding a drill bit in enlarging a worn valve stem guide of an internal combustion engine to receive a shim sleeve having an internal diameter equal to the nominal diameter of said valve stem guide and a larger outside diameter, said drill guide comprising: a. a straight, rigid guide bar adapted to be positioned above a line of stem guides of the head of said engine normally to the axes of said stem guides, b. a tubular drill bushing carried by said guide bar normally to the longitudinal extent thereof and adapted to guide a drill bit coaxially therein, said bushing having an internal diameter sized to receive a drill bit for drilling a hole in the engine head for receiving said shim sleeve, c. at least two pilot rods carried adjustably by said guide bar for movement relative to said guide bar in a direction parallel to the longitudinal extent of said guide bar, said pilot rods projecting normally from said guide bar parallel to but spaced apart from said drill bushing, said pilot rods being insertable simultaneously into certain stem guides of said engine head whereby to position said drill bushing relative to another of said stem guides, d. means operable to affix each of said pilot rods immovably to said guide bar at any desired point of said adjustable movement, and e. a third pilot rod having a portion having a diameter engageable snugly and removably in said drill bushing, and a portion reduced in diameter to a size insertable snugly into a stem guide of said engine head.
Claim 2
Dependent Claim
266 words
A drill guide for guiding a drill bit in enlarging a worn valve stem guide of an internal combustion engine to receive a shim sleeve having an internal diameter equal to the nominal diameter of said valve stem guide and a larger outside diameter, said drill guide comprising: a. a straight, rigid guide bar adapted to be positioned above a line of stem guides of the head of said engine normally to the axes of said stem guides, b. a tubular drill bushing carried by said guide bar normally to the longitudinal extent thereof and adapted to guide a drill bit coaxially therein, said bushing having an internal diameter sized to receive a drill bit for drilling a hole in the engine head for receiving said shim sleeve, c. at least two pilot rods carried adjustably by said guide bar for movement relative to said guide bar in a direction parallel to the longitudinal extent of said guide bar, said pilot rods projecting normally from said guide bar parallel to but spaced apart from said drill bushing, said pilot rods being insertable simultaneously into certain stem guides of said engine head whereby to position said drill bushing relative to another of said stem guides, d. means operable to affix each of said pilot rods immovably to said guide bar at any desired point of said adjustable movement, and e. a third pilot rod having a portion having a diameter engageable snugly and removably in said drill bushing, and a portion reduced in diameter to a size insertable snugly into a stem guide of said engine head.
Claim 3
Dependent Claim
266 words
A drill guide for guiding a drill bit in enlarging a worn valve stem guide of an internal combustion engine to receive a shim sleeve having an internal diameter equal to the nominal diameter of said valve stem guide and a larger outside diameter, said drill guide comprising: a. a straight, rigid guide bar adapted to be positioned above a line of stem guides of the head of said engine normally to the axes of said stem guides, b. a tubular drill bushing carried by said guide bar normally to the longitudinal extent thereof and adapted to guide a drill bit coaxially therein, said bushing having an internal diameter sized to receive a drill bit for drilling a hole in the engine head for receiving said shim sleeve, c. at least two pilot rods carried adjustably by said guide bar for movement relative to said guide bar in a direction parallel to the longitudinal extent of said guide bar, said pilot rods projecting normally from said guide bar parallel to but spaced apart from said drill bushing, said pilot rods being insertable simultaneously into certain stem guides of said engine head whereby to position said drill bushing relative to another of said stem guides, d. means operable to affix each of said pilot rods immovably to said guide bar at any desired point of said adjustable movement, and e. a third pilot rod having a portion having a diameter engageable snugly and removably in said drill bushing, and a portion reduced in diameter to a size insertable snugly into a stem guide of said engine head.
Claim 4
Dependent Claim
266 words
A drill guide for guiding a drill bit in enlarging a worn valve stem guide of an internal combustion engine to receive a shim sleeve having an internal diameter equal to the nominal diameter of said valve stem guide and a larger outside diameter, said drill guide comprising: a. a straight, rigid guide bar adapted to be positioned above a line of stem guides of the head of said engine normally to the axes of said stem guides, b. a tubular drill bushing carried by said guide bar normally to the longitudinal extent thereof and adapted to guide a drill bit coaxially therein, said bushing having an internal diameter sized to receive a drill bit for drilling a hole in the engine head for receiving said shim sleeve, c. at least two pilot rods carried adjustably by said guide bar for movement relative to said guide bar in a direction parallel to the longitudinal extent of said guide bar, said pilot rods projecting normally from said guide bar parallel to but spaced apart from said drill bushing, said pilot rods being insertable simultaneously into certain stem guides of said engine head whereby to position said drill bushing relative to another of said stem guides, d. means operable to affix each of said pilot rods immovably to said guide bar at any desired point of said adjustable movement, and e. a third pilot rod having a portion having a diameter engageable snugly and removably in said drill bushing, and a portion reduced in diameter to a size insertable snugly into a stem guide of said engine head.
Claim 5
Dependent Claim
63 words
A drill guide as recited in claim 1 wherein said drill bushing is carried adjustably by said guide bar for movement thereof relative to said guide bar in a direction parallel to the longitudinal extent of said guide bar, and with the addition means operable to affix said drill bushing immovably to said guide bar at any desired point of said adjustable movement.
Claim 6
Dependent Claim
36 words
A drill guide as recited in claim 2 wherein said drill bushing and said pilot rods are detachably connected to said guide bar whereby they may be detached therefrom and re-attached thereto in any desired sequence.
Claim 7
Dependent Claim
62 words
A drill guide as recited in claim 1 wherein each of said first pilot rods is connected to said guide bar by means including: a. a rectilinear block fitting closely and slidably in a rectangular longitudinal groove of said guide bar, said pilot rod being mounted in said block, and b. clamp means operable to affix said block immovably in said groove.
Claim 8
Dependent Claim
58 words
A drill guide as recited in claim 4 wherein said drill bushing is connected to said guide bar by means including: a. a rectilinear block fitting closely and slidably in a longitudinal groove of said guide bar, said drill bushing being affixed in said block, and b. clamp means operable to affix said block immovably in said groove.
Claim 9
Dependent Claim
157 words
A drill guide as recited in claim 2 wherein said guide bar is of generally inverted U-shape in cross-sectional contour, having a groove formed in the lower surface thereof, and a longitudinal slot formed through its top wall and communicating with said groove, said slot being transversely narrower than said groove; and wherein said pilot rods, and said drill bushing, are connected to said guide bar by means comprising: a. a series of at least three blocks carried slidably in the groove of said guide bar, said drill bushing and said pilot rods each being mounted in one of said blocks, with said drill bushing opening upwardly through said slot, and b. a series of cap screws each having a washer beneath the head thereof slidably abutting the top surface of said guide bar in bridging relation to said slot, each of said screws extending downwardly through said slot and beinG threaded into one of said blocks.
Claim 10
Dependent Claim
23 words
A drill guide as recited in claim 6 wherein said drill bushing and said pilot rods are permanently affixed in their associated blocks.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |