Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2000-05-31
2001-03-27
Walberg, Teresa (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C034S661000, C432S009000, C432S011000, C432S243000
Reexamination Certificate
active
06207931
ABSTRACT:
The invention relates to an apparatus for the heat treatment of workpieces with a plurality of evacuable chambers connected through airlocks, a conveyor, preferably a circular chain conveyor, for the transport of the workpieces along a path through the chambers, an electric resistance heating device, a cooling blower, and a heat exchanger.
An apparatus for the heat treatment of workpieces is known (DE 41 10 114) comprising a carburization zone, a quenching zone and a nitrating zone, which zones are designed in series, forming a continuous passage for the steel parts being transported, said passage being divided by doors, and where the quenching zone has a device for forced cooling of the steel parts.
Furthermore, a system is known for the continuous metallurgical treatment of various materials in low pressure conditions or in vacuum and under high temperature, for example ferro-alloys (OS 15 38 276), where in a low-pressure chamber a separate heating arrangement is provided, said arrangement being equipped with thermal insulation and heating elements, said low-pressure chamber being equipped with a pressure equalization chamber which is connected with said low pressure chamber and which can be separated from it for the loading and removal of the material, where in each of the above-named chambers devices necessary for the process are arranged and which devices are advantageously remote-controlled centrally.
There is further known an continuous-use electric oven (DE 32 33 361) for the heat treatment of steel objects, having a horizontally operating transport mechanism, an anterior pre-heating chamber, a heat treatment chamber which is arranged on top of a loading chamber with a vertically operating supply, and a posterior quenching chamber, whereby the heat treatment chamber is capable of being hermetically separated from the loading chamber by means of a floor, and the loading chamber is capable of being separated from the heating chamber by means of heat shields whereby the floor of the preheating chamber and the floor of the quenching chamber upon which floors the steel objects can be moved forward, are movable forward and back in relation to one another such that the steel objects, in connection with retractable stops located in front of and behind the loading chamber, are capable of being moved both onto and from the vertically operating conveyor as well as being capable of being moved up into the heat treatment chamber by the conveyor together with the floor.
Finally there is known a vacuum atmospheric oven for the heat treatment of workpieces with a heat chamber in which a fan is arranged for the circulation of the atmosphere (DAS 25 01 360), where a second fan is added to the fan for the mixing of the atmosphere while avoiding forced circulation, whereby the rotation speed and/or direction of both fans can be changed.
The object of the present invention is to provide an apparatus of the type in question which is suitable for the heat treatment of relatively thin-walled and narrow workpieces, in particular saw blades, while avoiding deformation of the workpieces as a result of the treatment. The apparatus is to be designed such that a large number of workpieces can be treated simultaneously and that the workpieces can be rapidly introduced into the apparatus for said treatment and/or rapidly removed from it after the completed treatment. Finally, the apparatus is to operate without a device which would make holding and securing of each individual workpiece necessary and would require for this purpose a special mount for each workpiece.
According to the invention this object is achieved in that a plurality of workpieces of equal size and configuration, for example hacksaw blades, are placed, lying closely together and forming a compact block, into an upwardly open frame constructed of profile sections, whereby the frame can be coupled to a conveyor by means of suspension elements.
Additional features and details are characterized and described in more detail in the subordinated claims.
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Loser Klaus
Zenker Wilfried
Ald Vacuum Technologies AG
Dahbour Fadi H.
Fulbright & Jaworski LLP
Walberg Teresa
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