FLUID PRESSURE INSTRUMENT WITH COVER FOR PREVENTING ERRONEOUS OPERATION

摘要

PURPOSE: To simply and certainly attach/detach a cover for preventing an erroneous operation to an operation element for a manual operation provided on a fluid pressure instrument and to mount the cover so as not to be lost even when it is detached for a manual operation. CONSTITUTION: Engagement grooves 7a, 7b are formed on an outer periphery of a plunger type operation element 3 provided on an upper surface of a body 4 in a projection state and a hook for resiliently engaging with the engagement groove 7a or 7b is provided on a cylindrical cover 5 and connected to the operation element 3. Thereby, a string-like connection member 12 for preventing loss of the cover 5 is provided and a height of the cover 5 is made to at least the same as that of the operation element 3 positioned at a non-operation position.