Displacement measuring and recording apparatus

Claim 1

Apparatus for measuring and recording the amplitude of the relative movement between a first object and a second object spatially disposed with respect to the first object comprising: a. a housing attached to said first object and having a continuous passage therethrough defined by a first bore section and a second bore section larger in cross section than said first bore section, the transition between said first and second bores defining a shoulder interior of said housing, said housing having a second passageway generally perpendicular to said first passageway and extending from an outside wall thereof to the interior of said first bore section; b. a follower member slidably positioned in and extending through said first bore section, said follower having a first end extending from said housing to engage said second object, the other end of said follower terminating within said second bore section and having an enlarged portion thereof to engage said shoulder; c. a first spring means disposed within said second bore section and engaging said enlarged portion of said follower member for urging said follower into engagement with said second object; d. removable retaining means disposed in the end of said housing containing said second bore section to confine said first spring means within said bore; e. scribe means slidably positioned within said second passageway having a pointed end directed toward the interior of said housing to engage a side of said follower member, said means being made from a material harder than that from which said follower is made; and f. a seCond spring means disposed within said second passageway for urging the pointed end of said marker into engagement with said follower.