Mark Products, Inc.

S E Haggard

James C Woodall, Jr

A seismic detector assembly is disclosed that includes a housing and a seismic detector or geophone located in the housing. The geophone has a pair of external terminals that are positioned asymmetrical to the longitudinal axis of the geophone. A printed circuit board having conductive strips for connecting the terminals to leader cables is located in the housing above the geophone. The printed circuit board has a pair of asymmetrical openings through which the asymmetrical terminals can extend only when the printed circuit board is oriented in one position relative to the geophone. Marks on the printed circuit board indicate which conductive strip should be connected to which terminal and the proper orientation of the printed circuit board relative to the truck that receives the output of the geophone.

Seismic detector assembly having polarized terminals

A seismic detector housing assembly is disclosed having a housing open at one end, a seismic detector having an outer case with generally flat end walls, and a pair of terminals extending out of the case through one end wall located in the housing with the terminals extending outwardly from the open end of the housing. A seal member of elastomeric material having openings, through which the terminals extend, covers the end of the detector and closes the open end of the housing. A PC board for connecting the terminals to leader wire conductors covers the seal member. A cup-shaped cap is attached to the housing to enclose the terminals and an outer edge to engage the PC board and compress the seal member into sealing engagement with the cap and the housing.

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Houston, TX, United States of America

S E Haggard