Temperature responsive probe apparatus

• US 4,841,274 A
• Filed: 12/21/1987
• Issued: 06/20/1989
• Est. Priority Date: 12/21/1987
• Status: Expired due to Fees

• Current Assignee: Therm-O-Disc Incorporated (Emerson Electric Company)
• Original Assignee: Therm-O-Disc Incorporated (Emerson Electric Company)
• Inventors: Yagher, Charles Jr., Day, Kenneth C.
• Primary Examiner(s): YASICH, DANIEL
• Application Number:
  US07/135,247
• Time in Patent Office: 547 Days
• Field of Search: 374/145, 374/110, 374/114, 374/115, 374/166, 374/135, 374/136, 338/28, 338/38, 338/36, 338/24, 338/34, 73/295
• US Class Current: 338/28
• CPC Class Codes: G01K 7/22 the element being a non-linear resistance, e.g. thermistor G01K7/26 takes precedence

Abstract

Temperature responsive apparatus includes a housing having a pair of spaced-apart probes, each receiving a different thermistor. The housing includes a one-piece hollow plastic shell having the pair of spaced apart probes formed integral therewith. The entire hollow interior of the shell, including the probes, is filled with plastic material to encapsulate the thermistors received within the probes.

Claims

1. Temperature responsive apparatus comprising an elongated hollow plastic shell having an open end and a closed end portion, a pair of spaced-apart probes on said closed end portion, and thermistor received in each said probe to sense fluid temperature, and plastic material filling said shell.

2. Temperature responsive apparatus including an elongated one-piece molded plastic shell having a hollow interior, an open end portion and a closed end portion that includes a pair of elongated spaced-apart probes, a temperature responsive device positioned within each said probe to sense fluid temperature, said hollow interior being substantially filled with plastic material within which said temperature responsive devices are encapsulated, each said probe having a cross-sectional outer periphery that is spaced from and completely outside of the cross-sectional outer periphery of the other said probe.

3. The apparatus of claim 2 including mounting means spaced from said probes for mounting said shell to a structure for projection of said probes therethrough into an environment whose temperature is to be monitored by said temperature responsive devices.

4. The apparatus of claim 2 wherein said probes are spaced-apart from one another across a gap, said probes having substantially parallel opposed surfaces on opposite sides of said gap.

5. The apparatus of claim 2 wherein said probes are contained within a circular area, said probes together having a cross-sectional area that is at least as great as one-half said circular area but substantially less than said circular area.

6. The apparatus of claim 2 wherein said shell has a cylindrical portion over the major portion of the length thereof between said open and closed end portions, said probes having a wall thickness that is substantially less than the wall thickness of said cylindrical portion.

7. The apparatus of claim 2 wherein said probes have curved outwardly facing surfaces that are curved to lie substantially on the periphery of a common circle.