Tunnel furnace height detector
AssigneeNGK Insulators, Ltd.
InventorsKeiji Yasuda, Tetsuo Kamijyo, Kazuhiro Miyahara
Life of this patent
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Abstract
A tunnel furnace height detector used for detecting ceiling heights of a tunnel furnace. The detector includes a plurality of detecting units arranged on a trolley traveling in the tunnel furnace in a manner such that their heights are progressively lowered by predetermined distances. Each of the detecting units includes a support base, and a solid piece pivotally connected to the support base automatically returnable from a pivotally moved position forced by an external force to an original position. The solid piece has one end in contact with a lowered ceiling and the other end closing and opening a measuring circuit system forming a closed circuit.
Claims7
A tunnel furnace height detector for detecting a variable ceiling height of a tunnel furnace, comprising a plurality of detecting units arranged on a trolley traveling in said tunnel furnace, said plurality of detecting units each having a height which is progressively increases by a predetermined distance, each of said detecting units comprising:
- a support base;
- and
- a solid piece pivotally connected to said support base, said solid piece having one end to contact said ceiling and another end to open or close an electrical measuring circuit;
- wherein said solid piece is pivoted when said one end contacts said ceiling such that said another end opens said electrical measuring circuit, and said solid piece automatically returns to a position where said another end closes said electrical measuring circuit when said one end is spaced from said ceiling.
Dependencies are inferred from the claim text.