Temperature sensing device

Claim 2

A temperature sensing device, comprising, a body defining a cylinder having a closed first end and an open second end, said body being adapted for placing said closed first end in a region where temperature is to be sensed, a rod extending through said open end and being movable axially in said cylinder, a piston carried by said rod within said cylinder and being movable with said rod in said cylinder from a first position toward said first end of said cylinder to a second position spaced from said first end of said cylinder, said piston having a first side toward said first position and a second side toward said second position, bias means resiliently biasing said piston toward said second position, and a quantity of alloy within said cylinder for holding said piston in said first position when said alloy is solidified on said second side of said piston, said piston being shaped to allow said alloy when melted to flow either from said first side of said piston to said second side or from said second side of said piston to said first side.

Claim 3

A temperature sensing device according to claim 1 wherein said piston abuts said closed end of said cylinder when in said first position.

Claim 4

A temperature sensing device according to claim 1 wherein said piston is provided with a passage therethrough from one side to the other for allowing molten alloy to flow therethrough when said piston is displaced.

Claim 5

A temperature sensing device according to claim 1 wherein said cylinder is of enlarged diameter toward said closed end thereof, and wherein an annular seal is disposed in said enlarged diameter portion between said body and said rod, said annular seal being movable axially within said cylinder in response to fluid pressure exerted thereon.

Claim 6

A temperature sensing device according to claim 1 wherein said alloy is a eutectic.

Claim 7

A temperature sensing device according to claim 1 and further including a sleeve for slidably guiding said rod and means for adjustably mounting said sleeve in a temperature well.

Claim 8

A temperature sensing device according to claim 6 wherein said mounting means include spring means for resiliently biasing said body axially of said sleeve.

Claim 9

A temperature sensing device according to claim 7 including seal means for sealing said body against the temperature well.

Claim 10

A temperature sensing device according to claim 8 wherein said seal means include a radially deformable annular seal, and a ring having a frustoconical surface engaging said annular seal, said spring means engaging said ring to bias same axially against said annular seal.

Claim 11

A temperature sensing device, comprising, a body defining a cylinder having a closed first end and an open second end, said body being adapted for placing said closed fIrst end in a region where temperature is to be sensed, a rod extending through said opening end and being movable axially in said cylinder, a piston carried by said rod within said cylinder and being movable with said rod in said cylinder from a first position toward said first end of said cylinder to a second position spaced from said first end of said cylinder, bias means resiliently biasing said piston toward said second position, said cylinder being of enlarged diameter toward said closed end thereof, an annular seal disposed in said enlarged diameter portion of said cylinder between said body and said rod, said annular seal being movable axially within said cylinder in response to fluid pressure exerted thereon, and a quantity of eutectic within said cylinder for holding said piston in said first position when said eutectic is solidified on the side of said piston toward said annular seal, said piston having a passage therethrough from one side to the other to allow molten eutectic to flow therethrough when said piston is displaced.

Claim 12

A temperature sensing device, comprising, a body defining a cylinder having a closed first end and an open second end, said body being adapted for placing said closed fIrst end in a region where temperature is to be sensed, a rod extending through said opening end and being movable axially in said cylinder, a piston carried by said rod within said cylinder and being movable with said rod in said cylinder from a first position toward said first end of said cylinder to a second position spaced from said first end of said cylinder, bias means resiliently biasing said piston toward said second position, said cylinder being of enlarged diameter toward said closed end thereof, an annular seal disposed in said enlarged diameter portion of said cylinder between said body and said rod, said annular seal being movable axially within said cylinder in response to fluid pressure exerted thereon, and a quantity of eutectic within said cylinder for holding said piston in said first position when said eutectic is solidified on the side of said piston toward said annular seal, said piston having a passage therethrough from one side to the other to allow molten eutectic to flow therethrough when said piston is displaced.

Claim 13

A temperature sensing device, comprising, a body defining a cylinder having a closed first end and an open second end, said body being adapted for placing said closed first end in a region where temperature is to be sensed, a rod extending through said open second end and being movable axially in said cylinder, means for moving said rod axially in said cylinder in response to the sensing of a predetermined temperature, a sleeve for slidably guiding said rod, means for adjustably mounting said sleeve in a temperature well, said mounting means including means for resiliently biasing said body axially of said sleeve, a radially deformable annular seal surrounding said body, a ring having a frustoconical surface engaging said annular seal, said spring means engaging said ring to bias same axially against said annular seal for sealing said body against the temperature well.

Claim 14

A temperature sensing device, comprising, a body defining a cylinder having a closed first end and an open second end, said body being adapted for placing said closed first end in a region where temperature is to be sensed, a rod extending through said open second end and being movable axially in said cylinder, means for moving said rod axially in said cylinder in response to the sensing of a predetermined temperature, a sleeve for slidably guiding said rod, means for adjustably mounting said sleeve in a temperature well, said mounting means including means for resiliently biasing said body axially of said sleeve, a radially deformable annular seal surrounding said body, a ring having a frustoconical surface engaging said annular seal, said spring means engaging said ring to bias same axially against said annular seal for sealing said body against the temperature well.