US3630184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow plug
Assignee: Robert Bosch GmbH
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Filing: 1970-01-16
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Granted: 1971-12-28
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Expires: 1990-01-16
Abstract
Abstract A glow plug has an elongated tubular housing and a convoluted tubular member located in and extending axially through this housing. A leading end portion of the tubular member is located proximal to the front end of the tubular housing. Fuel outlet means is provided in the front end portion and fuel inlet means are provided in the tubular member rearwardly of the outlet means. A glow pin extends through the center of the helix constituted by front tubular member and is electrically energizable for thereby indirectly heating fuel passing through the tubular member from the inlet means to the outlet means so that such fuel issues from the outlet means as flammable fuel vapor.
Inventors
- 👤 Karl Wolf
- 👤 Helmut Weyl
- 👤 Otto Beesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:01
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02; F02N19/04; F02N19/06; F23; F23Q; F23Q7/00; F23Q7/001
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A glow plug for use in diesel and related engines, comprising an elongated tubular housing having a front end, a helically convoluted tubular member located in and extending axially through said housing, said tubular member having a front end portion proximal to said front end; fuel outlet means in said front end portion, and fuel inlet means in said tubular member rearwardly of said outlet means; and combined heating and igniting means for heating fuel passing through said tubular member from said inlet means to said outlet means so that such fuel issues from said outlet means as flammable fuel vapor, and having an igniting portion located in the region of said outlet means for contact with and igniting of said flammable fuel vapor.
Claim 2
Dependent Claim
124 words
A glow plug for use in diesel and related engines, comprising an elongated tubular housing having a front end, a helically convoluted tubular member located in and extending axially through said housing, said tubular member having a front end portion proximal to said front end; fuel outlet means in said front end portion, and fuel inlet means in said tubular member rearwardly of said outlet means; and combined heating and igniting means for heating fuel passing through said tubular member from said inlet means to said outlet means so that such fuel issues from said outlet means as flammable fuel vapor, and having an igniting portion located in the region of said outlet means for contact with and igniting of said flammable fuel vapor.
Claim 3
Dependent Claim
39 words
A glow plug as defined in claim 1, wherein said combined heating and ignited means comprises at least one electrically energizable glow pin; and wherein said tubular member is helically convoluted about said glow pin in heat-exchanging relationship therewith.
Claim 4
Dependent Claim
29 words
A glow plug as defined in claim 1, said outlet means comprising a plurality of fuel vapor outlet openings provided in said front end portion of said tubular member.
Claim 5
Dependent Claim
73 words
A glow plug as defined in claim 2, wherein said front end portion projects outwardly of said front end of said housing; and further comprising a sleeve surrounding said front end portion with clearance and being secured to said housing; an aperture means in said sleeve; and wall means subdividing said sleeve and forming with said front end portion a plurality of communicating chambers arranged to facilitate admixture of air and fuel vapor.
Claim 6
Dependent Claim
107 words
A glow plug as defined in claim 4, said wall means comprising a dividing wall extending at least substantially normal to the longitudinal axis of said sleeve means and subdividing the latter into two axially adjacent chambers one of which is closer to said front end portion than the other, said air aperture means and said outlet means commUnicating with said one chamber, said igniting portion of said glow pin extending through said dividing wall into the other of said chambers; and gap means dimensioned to admit a relatively small quantity of fuel vapor and air from said one chamber into said other chamber for ignition therein.
Claim 7
Dependent Claim
43 words
A glow plug as defined in claim 1, wherein said heating means comprises at least two electrically energizable glow plugs extending axially through said housing; and wherein said tubular member is helically convoluted about both of said glow plugs in heat-exchanging relationship therewith.
Claim 8
Dependent Claim
42 words
A glow plug as defined in claim 6, said outlet means comprising a plurality of outlet openings facing towards at least one of said glow pins so that fuel vapor issues from said outlet openings in direction towards said one glow pin.
Claim 9
Dependent Claim
49 words
A glow plug as defined in claim 6; leading sections of said glow pins and of said tubular member projecting outwardly from said front end of said housing; further comprising a sleeve connected to said housing projecting forwardly from said front end and surrounding said leading sections with clearance.
Claim 10
Dependent Claim
29 words
A glow plug as defined in claim 8, further comprising dividing means in said sleeve and extending axially of the same intermediate said leading sections of said glow pins.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |