Electric heating – Heating devices – Resistive element: igniter type
Reexamination Certificate
2000-05-05
2001-07-03
Jeffery, John A. (Department: 3742)
Electric heating
Heating devices
Resistive element: igniter type
C123S14500A
Reexamination Certificate
active
06255626
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to glow plugs which have a heating rod with an inner pole with glow and optionally control element(s), the heating rod being electrically insulated relative to the glow plug body, and a process for producing these glow plugs.
2. Description of the Related Art
Making glow plugs with a metal heating rod with an inside pole and with metal glow plug bodies such that between the wall of the heating rod and the glow plug body heat-resistant electrical insulation in the form of a glass seal is inserted is known from general practice. Here the metal glow plug body and the metal heating rod with their respective terminal as well as the glass tubes located between the glow plug body and the heating rod are inserted into a graphite mold and heated in a furnace until the glass melts. The terminals are electrically insulated from one another by ceramic tubes. After cooling and solidification of the molten glass the glow plug body is fixed insulated against the heating rod and the terminals. In this complex production process treatment must take place in a furnace, by which among others also the use of heat-resistant materials is necessary. Construction precision and operating quality cannot be easily ensured in this process, since for example during the process distortion of the components is possible. The just described technical effort of producing glow plugs of this type corresponds to the economic cost.
It has likewise been proposed that at least the heating rod be produced from ceramic material; in doing so in a multistage production process for which special tools and devices are necessary the ceramic must be shaped, compounded, fired and ground into the heating rod. In addition, the ceramic heating rod must be connected to a support tube and can only be built into a finished glow plug in conventional installation.
SUMMARY OF THE INVENTION
The object of the invention is to make available, while circumventing the disadvantages known from the prior art, a glow plug which conventionally can be produced while avoiding special expensive and complex production processes, which makes available a relative large defined electrode, which has high construction precision and functional quality and especially in combined use for ion flow measurement leads to improved and more reliable measurement signals.
REFERENCES:
patent: 4475029 (1984-10-01), Yoshida et al.
patent: 5922229 (1999-07-01), Kurano
patent: 41 17 253 (1991-12-01), None
patent: 6-265144 (1994-09-01), None
Patent Abstracts of Japan, vol. 007, No. 257 (M-256), Nov. 16, 1983, & JP 58 138928 A (Nippon Tokushu Togyo KK), Aug. 18, 1983, English Abstract.
Patent Abstracts of Japan, vol. 013, No. 311 (M-851), Jul. 17, 1989 & JP 01 102220 A (Nippon Denso CO Ltd), Apr. 19, 1989, English Abstract.
Allgaier Martin
Eller Martin
Endler Max
Grebe Reinhold
Haussner Michael
Beru AG
Jeffery John A.
Nixon & Peabody LLP
Safran David S.
LandOfFree
Glow plug and process for its manufacture does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Glow plug and process for its manufacture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glow plug and process for its manufacture will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2442279