Patent ID: 9671295
Date: 2017-06-06
CPC Classifications: G01K

Claim:
1. A terminal head of a sheath type temperature sensor provided for connection of a sheath type temperature sensor, in which a temperature sensor is housed in a tube-shaped metal sheath via inorganic insulating powder, to a cable for transmission of a signal from the temperature sensor, the terminal head comprising: an outer frame body having an upper opening formed in an upper portion, a side opening that is formed in a side portion and receives insertion of the cable, and a bottom opening that is formed in a bottom portion and receives approximately vertical insertion of the sheath type temperature sensor; a cover attached to the upper opening of the outer frame body by threaded mating; a terminal plate that is made of an electrical insulating material, is fixed to an inner portion of the outer frame body by a plurality of terminal plate fixing screws, has a smaller horizontal dimension than the horizontal dimension of the upper opening of the outer frame body, and is provided at a position at which, by removing the terminal plate fixing screws and moving the terminal plate vertically upward, the terminal plate can be removed from the outer frame body through the upper opening of the outer frame body from which the cover was detached; terminal fittings attached to an upper surface of the terminal plate, the number of terminal fittings being the same as the number of leads of the sheath type temperature sensor; cable wiring terminals for respectively connecting leads of the cable to the terminal fittings by threaded mating to the terminal fittings; a pair of plug-in connectors, one of which is a male connector in which the same number of male electrode pins as the number of leads of the sheath type temperature sensor are provided in a body made of electrical insulating resin, and the other of which is a female connector in which the same number of female electrode pins as the number of electrode pins of the male connector are provided in a body made of electrical insulating resin, one connector out of the male connector and the female connector being attached to the terminal plate, and the other connector being attached to an upper end portion of the sheath of the sheath type temperature sensor; and a coupling nut that, in a state in which the connector attached to the terminal plate side and the connector connected to the sheath type temperature sensor side are coupled, holds the coupled state by threaded fastening at positions that span the two connectors, wherein the connector attached to the terminal plate side is fixed to the terminal plate in an orientation in which the connector attached to the sheath type temperature sensor side is coupled thereto from below and the electrode pins of the connector attached to the terminal plate side and the cable wiring terminals are electrically connected by the terminal fittings and connecting conductors that connect upper end portions of the electrode pins and the terminal fittings, the connector attached to the sheath type temperature sensor side is fixed to the sheath type temperature sensor in an orientation in which the connector attached to the terminal plate side is coupled thereto from above, and is fixed in a state in which the upper end portion of the sheath of the sheath type temperature sensor is inserted into a lower portion of the cylindrical body of the connector attached to the sheath type temperature sensor side such that the sheath type temperature sensor is approximately vertical in the coupled state, and the leads of the sheath type temperature sensor protruding from the sheath are respectively connected to lower end portions of the electrode pins of the connector attached to the sheath type temperature sensor side, and in a state in which the terminal plate, the terminal fittings, the cable wiring terminals, the pair of plug-in connectors, the coupling nut, and the sheath type temperature sensor are assembled, the horizontal dimension of the assembled one piece does not exceed the horizontal dimension of the terminal plate.