Electric heating – Heating devices – With heater-unit housing – casing – or support means
Reexamination Certificate
1995-06-13
2001-03-06
Jeffery, John A. (Department: 3742)
Electric heating
Heating devices
With heater-unit housing, casing, or support means
C219S544000, C156S304200, C285S021200
Reexamination Certificate
active
06198081
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a shaped part of a thermoplastic material, such as described in the preamble to claim
1
.
Such a shaped part developed as weld socket is known from Federal Republic of Germany C2-27 60 064. In that case, the weld indicator consists of a sensing pin arranged in a cylindrical free space in the body of the socket, said pin being essentially cylindrical and having a tip which is flush with the outer periphery before its deformation as a result of the welding.
The base of the sensing pin is arranged on the bottom of the free space close to the electric resistance heating wire. This weld indicator has the disadvantage that, upon the melting of the thin wall of the body of the socket in the region of the free space, the wall can be broken through and the melted thermoplastic material can escape from the free space. As a result of these melt movements, short circuits may occur and thus local overheating and burning of material.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a shaped part having a weld indicator of the aforementioned type in which such an indication of successful welding is given without emergence of the thermoplastic material and which can be produced without additional parts, at the same time as the production of the shaped part, for instance by injection shaped part.
In accordance with the invention, this object is achieved by the features set forth in claim
1
.
Particularly advantageous developments of the invention are set forth in the dependent claims.
REFERENCES:
patent: 4117311 (1978-09-01), Sturm
patent: 4313053 (1982-01-01), Sturm
patent: 4375591 (1983-03-01), Sturm
patent: 4626308 (1986-12-01), Ansell
patent: 4703150 (1987-10-01), Kunnecke et al.
patent: 5116082 (1992-05-01), Handa et la.
Messmer Alfred
Petry Dirk Alexander
Steinmetz Hans Werner
Bachman & LaPointe P.C.
Georg Fischer Rohrleitungssysteme AG
Jeffery John A.
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