Title:
【発明の名称】差動圧力スイッチ装置
Document Type and Number:
Japanese Patent JP3169669
Kind Code:
B2
Abstract:
A differential pressure switch assembly for low pressure applications permitting accurate "in field" set pointing of same, comprising a capsulized instrument that includes housing high and low pressure sections defining in assembled relation a pressure cavity across which such sections mount a flexible diaphragm separating high and low pressure chambers, with the low pressure section mounting at a site on the low pressure section a snap switch unit of a size appropriate for such assembly, which unit has a projecting plunger therefor that has an end portion disposed in the low pressure chamber of the unit, with the assembly further comprising a pressure differential sensor disposed for effecting electrical switching of the snap switch unit when the pressure of the assembly high pressure chamber exceeds that of the low pressure chamber by a predetermined differential. The pressure sensor comprises a leaf spring that is initially flat between its ends and is mounted at one end of same to extend across the assembly low pressure chamber so that the other end of same cooperates with the switch unit plunger to effect said electrical switch of same, and such other end of the leaf spring includes an adjustment screw arrangement for acting on the snap switch unit plunger, to effect, prior to the assembly of the switch assembly, pretravel take up of the snap switch unit plunger in the range of from about sixty percent to about eighty percent.
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Inventors:
Stephen, Elle, Squires
Application Number:
JP3721492A
Publication Date:
May 28, 2001
Filing Date:
January 28, 1992
Export Citation:
Assignee:
DWYER INSTRUMENTS, INC.
International Classes:
G01L13/06; H01H35/26; (IPC1-7): G01L13/06
Domestic Patent References:
| JP5115982U | ||||
| JP5847144U | ||||
| JP6069450U | ||||
| JP5555737U |
Attorney, Agent or Firm:
Kazuo Sato (3 others)