| 摘要 |
<p>Case No. 735.054 GKP S P E C I F I C A T I O N SEISMIC LAND SOURCE Inventor: Stephen V. Chelminski A seismic land source for transmitting powerful seismic energy impulses into the earth comprising a domeshaped bell within which is contained a substantially incompressible liquid and an air gun which can be fired for abruptly releasing pressurized gas into the liquid in the bell. A metal pan is positioned below the rim of the bell for engaging the surface of the earth below the bell and is mounted for downward movement with respect to the bell. A flexible elastomeric diaphragm extends across the bottom of the bell above the metal pan and extends upwardly beyond the bell rim between the rim and the pan. The diaphragm has a rounded shoulder portion with an upturned peripheral side wall portion extending upwardly around the exterior of the bell to an elevated level substantially above the bell rim, and the upper edge of the peripheral side wall of the diaphragm is clamped at said elevated level to a flange fixed to the outer surface of the bell. A plurality of pneumatic cylinders are arranged to pull upwardly on the rim of the pan to prevent cocking of the pan prior to firing is the pan inadvertently is placed eccentrically on a rock.</p> |
