Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1978-10-27
1981-06-09
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
367144, G01V 138
Patent
active
042719240
ABSTRACT:
Airgun apparatus are disclosed providing high strength, high pressure and large volume capabilities. An integral high-strength cylindrical housing extends for the full length of the airgun and gives a sleek overall cylindrical configuration. The components of the airgun advantageously are assembled within this cylindrical housing in two groups by sliding them in through the upper or lower end, respectively; moreover, either of the groups of components can be removed independently of the other. The components are pressed firmly together in place within the cylindrical housing by a strong screw-jack type of holding action, and tightening and locking apparatus is included on the airgun itself for enabling the mechanic to tighten and lock the holding means with enormous mechanical advantage. Even though held together under great axial compression, the components are maintained in predetermined accurately registered relationship with respect to the discharge ports in the cylindrical housing and with respect to each other by first and second internal shoulders located within the cylindrical housing near the discharge ports. A reliable, rugged firing seal engages the periphery of the firing piston when it is in its closed position. This firing seal is captivated in position and does not involve any associated springs or movable members, and gas pressure is applied in a manner to increase the tightness of the sealing action. This peripheral firing seal enables the firing chamber to have a wide-mouth so that discharged gas can flow out without restriction. The rebound action of the shuttle near the top of its firing stroke is advantageously controlled and damped for reducing stresses, and the rebound control and damping effect can be adjusted.
REFERENCES:
patent: 3416621 (1968-12-01), Balashkard et al.
patent: 3638752 (1972-02-01), Wakefield
patent: 3653460 (1972-04-01), Chelminski
patent: 3997021 (1976-12-01), Chelminski
patent: 4051918 (1977-10-01), Rogers
patent: 4098369 (1978-07-01), Altschuler et al.
patent: 4114723 (1978-09-01), Paitson et al.
patent: 4164264 (1979-08-01), Fair
Birmiel Howard A.
Bolt Associates, Inc.
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