Ordnance – Multiple barrel guns
Reexamination Certificate
2002-02-26
2004-03-09
Johnson, Stephen M. (Department: 3641)
Ordnance
Multiple barrel guns
C089S127000, C181S116000
Reexamination Certificate
active
06701818
ABSTRACT:
TECHNICAL FIELD
This invention relates to methods of and apparatus for delivering loaded projectiles for civilian purposes.
The civilian purposes which may be embraced by this invention include, but are not limited to:
seismic exploration utilising explosive signal generators in the form of projectiles launched from a site remote from the location to be explored;
target specific fire fighting utilising projectiles containing fire retardant;
launching projectiles containing matter or objects to be delivered rapidly to a site remote from the launch site, such as difficult to access sites for subsequent retrieval from a containment part of the projectile, and
launching projectiles containing matter to be dispersed from the a projectile in flight above a target zone, such as dispersal of fire retardants or insecticides or other treatment.
This invention has particular application to launching projectiles from a barrel having a plurality of projectiles arranged in-line within the barrel and which are associated with discrete selectively ignitable propellant charges for propelling the projectiles sequentially through the muzzle of the barrel. Sealing engagement is provided between projectiles and barrel so as to prevent rearward travel of an ignited propellant charge to the trailing propellant charge. Such barrel assemblies will be referred to hereinafter as of the type described. Such barrel assemblies are illustrated in our earlier International Patent Applications.
BACKGROUND ART
Seismic exploration of the earth's strata is extensively used in oil prospecting, as well as for site investigation in building large scale structures and other civil engineering projects such as for determination of depth to bedrock, delineation of sand and gravel deposits and detection of water-bearirg fracture zones and the like in land and marine operations.
The principles of seismic methods of geophysical exploration or mapping are well known. Initially explosive charges were placed to initiate shock waves in the earth's crust. In order to provide appropriate signals a plurality of spaced apart subterranean charges were utilised. While this method is effective the cost of drilling and placement of the charges, mostly in remote areas, is extremely high. On-surface charges have also been trialled, however this did not result in the formation of an effective signal.
In more recent times most seismic exploration has been carried out using a VIBROSEIS type method in which vehicle mounted mechanical vibration apparatus is utilised to instigate the necessary subterranean shock waves. The mechanical vibrating source introduces a definite band of frequencies into the earth. Because of the physical constraints placed on a large vibrating body it is understood that the disturbance produced is in the form of an oscillatory pulse of finite duration in which the frequency changes, substantially linearly with time.
Such systems may have means to vary the frequency of vibration and amplitude of the pulse but such variations are also limited by the mechanical constraints of the particular equipment utilised. The duration of a typical seismic pulse will generally not exceed a few seconds with frequencies within a frequency range between 15 Hz and 90 Hz and with increasing amplitude of the pulse during the event.
Use of these methods is limited to vehicle accessible areas. However seismic signals are provided which enable a more detailed interpretation of the earth's strata to be achieved than is achieved using explosive detonation to generate the seismic signal. However this method is difficult to employ in remote areas and its cost of utilisation in such remote areas is high. There are also significant constraints on the signal type which may be generated, especially utilising mechanical vibration apparatus which of necessity must be by extremely large machines.
In marine operations, the most widely used method of generating seismic signals is to use an air-gun which discharges highly compressed air into the water.
Target specific fire fighting, such as remote fighting a fire in an office of a high rise building has typically been performed by directing a water stream or fire retardant from an elevated platform supported by an extendable ladder. This has limitations imposed by the time required to target the fire and the ability to closely position a nozzle to direct and supply the water or retardant to the site of the fire.
Limitations in delivery of other matter to remote sites is well understood.
OBJECTS OF THIS INVENTION
This invention aims to alleviate at least one or more of the difficulties associated with presently available delivery or placement methods.
DISCLOSURE OF INVENTION
With the foregoing in view, this invention in one aspect resides broadly in a method of seismic exploration including:
barrel assembly of the type described which is capable of firing a plurality of seismic signal instigating projectiles;
providing control means for controlling the rate of fire of the projectiles, and
firing seismic signal instigating projectiles from said barrel assembly to the ground/water at a selected rate and/or direction to propagate the desired seismic signal.
The projectiles may be non-explosive projectiles which rely on impact for instigation of the desired seismic signal or the projectiles may contain explosives which detonate on impact with the ground or when dispose or beneath the ground/water.
Suitably the seismic signal is created by firing a series of projectiles into the ground or water. The barrel assembly may include a stack of barrel assemblies and the series of projectile firings to form the seismic signal may be formed by simultaneously firing the outermost ones of the projectiles in the stack of barrel assemblies.
The plurality of projectiles may be fired to enter the ground simultaneously or at selected intervals. The intervals may be achieved by controlling the firing rate, by axially staggering the projectiles to be fired and then firing them simultaneously either from a single barrel or from respective barrels or by controlling the trajectory of firing and the speed of craft/vehicle upon which the barrel assembly is mounted. If desired the trajectory of firing may be arranged to compensate for the speed of travel of the craft/vehicle, such as for vertical entry of the earth.
Using a pod of ninety-eight 40 mm barrels as described above and launching grenade-like explosives, the barrel assembly would have the ability to produce discrete seismic signals instigated by the firing of ninety-eight projectiles, or more or less, simultaneously or in a short burst or a smaller number of longer or more powerful signals each achieved by multiple simultaneous explosions from a selected number of simultaneous firings.
During a firing sweep, the amplitude of the desired seismic signal may then be varied as desired by firing the appropriate strength projectile, and of course the amplitude may also be varied by firing projectiles from a varying numbers of barrels simultaneously. Combinations of amplitudes and frequencies may therefore be generated that are difficult or impossible to achieve with conventional hydraulic or electromagnetic vibration plates utilised in a VIBROSEIS type method.
The pod may be fired from a marine platform into water, or from a sled towed underwater and if desired adapted to closely follow the contour of the underwater bed. It could be fired from a vehicle platform into the ground. The pod may also be fired from an aircraft, or from a number of aircraft flying in formation, with the firing coordinated between the aircraft by a suitable electronic link.
Such a method will provide for rapid exploration of large areas, particularly when the detection and recording of the seismic waves is achieved by suitable airborne laser or infra red means. Over water a similar capability may be introduced by the use of trailing hydrophones.
The above embodiments should enable sweep rates, amplitudes, and frequencies to be optimally selected to suit the geologic conditions in the are
Finnegan Henderson Farabow Garrett & Dunner LLP
Johnson Stephen M.
Metal Storm Limited
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