US 3071883 A
Description (OCR text may contain errors)
Jan. 8, 1963 R. MERZ UNDERWATER PROJECTILE Filed June 50, 1959 IN V EN TOR. RUDOLF MERZ Hahn)? 3,071,883 Patented Jan. 8, 1963 3,071,883 a UNDERWATER PROJECTILE Rudolf Merz, Rochester, N.Y., assignor to Crosman Arms ompany,'1nc., Fairport, N.Y., a corporation of New ork Filed June 30, 1959, Ser. No. 823,900
Claims. (Cl. 43-6) The present invention relates to underwater projectiles, and more particularly to projectiles adapted to be fired from a gas-operated underwater gun while submerged. In a more specific aspect, the invention relates to an elongated hollow spear-like projectile which is adapted to be filled with the propelling gas while it is loaded in the gun so that when the projectile is released it is propelled through the water with great power and extreme accuracy. This is partly due to the fact that the spear is subjected to the maximum propelling pressure before the spear leaves the barrel of the gun, and partly due to the fact that the propelling gas fills the hollow spear prior to firing and expands in the spear after it leaves the barrel of the gun thus producing an additional reactionary spropelling pressure.
One object of the present invention is to provide an improved elongated hollow spearlike projectile for gaspowered underwater guns. i 1
Another object of this invention is to provide an improved underwater projectile of the character described which can be loaded into the gun while submerged.
Another object of this invention is to provide an improved underwater projectile of the character described which permits the propelling gas to eject water from the interior of the projectile prior to firing while it is loaded in the gun.
A further object of this invention is to provide an improved underwater projectile of the character described which permits the propelling gas to effectively force the water out of the hollow portion of the projectile prior to firing and also to seal the hollow chamber in the projectile to prevent the escape of gas, prior to firing, after the water is forced out of the projectile.
A still further object of this invention is to provide an improved underwater projectile of the character described,- which is simple in its construction, and inexpensive to manufacture.
Other objects of this invention will become apparent from the drawings, the specification, and the appended claims.
In the drawing: I FIG. 1 is a fragmentary sectional view of an underwater spear constructed according to one embodiment of this invention, and showingthe spear inserted in firing position in an underwater gun with the water outlet of the spear open;
FIG. 2 is a fragmentary sectional view of the spear shown in FIG. 1 showing the water outlet closed;
FIG. 3 is a fragmentary sectional view of a modified hollow underwater projectile with the water outlet of the spear open; and
FIG. 4 is afragmentary sectional view of the spear shown in FIG. 3'with the water outlet closed.
An underwater spear constructed according to this invention is adapted to be used with a gas powered gun such as disclosed in application of William R. Malcolm, Serial No. 800,503, filed March 19, 1959, and reference may be made to that application for a more detailed description of this gun. The gun shown comprises a tube to which is attached a barrel 12. A valve body 14 is secured in the tube 10 and has a forward portion 16 of reduced diameter around which the spear is adapted to seat when in firing position. A manually-operated valve (not shown) controls the admission of gas from a pres- United States Patent OfiiCC 2 surized cartridge (not shown) through a central bore 17 formed in the valve body 14 into the hollow projectile. A trigger sear 18 is slidably mounted in the tube 10 and is attached to a trigger 19 which withdraws the sear from the interior of the tube 10 to release a projectile held therein.
The projectile is generally referred to as 20. It comprises a tube 22 which is closed at its forward end by a plug 24 which is threaded at 26 into the tube. The threaded joint between the plug 24 and the tube 22 is pressure sealed by an O-ring 28. The plug 24 has an axial bore 30 that communicates at its rear end with the interior of the tube 22 and communicates at its forward end with the rear end of an axially-extending internallythreaded chamber 32 formed in the plug 24. The plug 24 has a radially-extending duct 34 which communicates at one end with the interior of the threaded chamber 32 and opens at its other end with the exterior. A rod 36, which has external threads 40 adjacent its rear end threads into the chamber 32. It has attached at its forward end a piercing head 38. The rod 36 is rotatably threaded into the chamber 32 so that by turning in oppo-1 site directions the rod 36, the duct 34 may be sealed off or opened, respectively.
The tube 22 has a centering member 44 threaded into it at its rear end which is adapted to be positioned around the forward portion 16 either valve body 14, and to center the projectile in the gun barrel. An O-ring 48 is interposed between the end of the tube'22 and a shoulder 50 formed on the member 44 to seal the threaded joint 46.- Rearwardly of the shoulder 50 is an annular groove 52 in which the sear 18 is adapted to engage. An O-ring 54 is positioned in an internal groove in the member 44 to seal the member on the forward portion 16 of the valve body 14.
Assuming that the diver is under water and wishes to reload the gun shown in FIG. 1, the projectile. 20 is inserted into the barrel 1'2 and shoved rearwardly so that the member 44 sealingly fits about the reduced diametrical portion 16 of the valve body and the trigger sear 18 engages in the annular groove 52. The rod 36 is then threaded forwardly so that the rear end of the threaded portion 40 of the rod clears the inner end of the duct 34. The gun is tilted so that the front end of the spear or projectile points downwardly and gas is then admitted through the bore 17 of the valve body 14 and into the interior of the projectile 20 by opening the previously mentioned valve of the gun. The gas forces the water contained in the hollow portion of theprojectile through the bore 30 into the chamber 32 and out through the radial duct 34. When the diver sees bubbles coming from the duct 34 he merely rotates the rod 36 to thread it .inwardly in the chamber 32 thus sealing off the 'duct 34 and preventing any further escape of gas. The aforementioned valve is then shut off, after the pressure in the interior of the projectile reaches the desired amount.
To fire the projectile the trigger 19 is pressed which disengages the trigger sear 18 from the annular groove 52 thereby permitting the gas to force the projectile out of the gun.
Referring to FIGS. 3 and 4 a modified spear is shown. This comprises a tube 122 which is closed at its forward end by a plug 124 which is threadably secured to the tube at 126. An O-ring 128 pressure seals the threaded joint 126. The plug 124 is provided with an axial bore 130 which communicates at its rear end with the interior of the tube 122 and at its forward end with the rear end of a chamber 132 which is internally threaded for a portion of its length. A radial duct 134 which is formed in the plug 124 communicates at its inner end with the chamber 132 and at its other end with the exterior. A rod 136 is permanently threaded into .U the chamber 132 by threads 140. This rod has a piercing head portion 138 attached at its front end. The rear end of the rod 136 terminates forward of the radial duet 134. Thus duct 134 is open at all times.
Centering member 144 is threadably secured to the rear end of the tube 122 at 146. An O-ring 148 which is interposed between the end of the tube 122 and an annular shoulder 150 formed on the member 144 pressure seals the threaded joint 146. An annular groove 152 on the member 144 is adapted to be engaged by the trigger sear 18. An O-ring 154 is positioned in an internal groove in the member 144 to seal against the forwardly projecting portion 16 of the valve body 14. The forward end of the member 144 is partially closed by an annular flange 160 which has a central opening 162 therethrough. A float ball 170 is disposed in the tube 122 to move between the flange 160 and the rear face 172 of projection of the plug 124.
The projectile 100 is loaded int-o the barrel 12 of the gun in a manner similar to that described for loading the projectile 20. The gun is tilted so that the front end of the spear or projectile points downwardly and when gas is admitted into the interior of the cylindrical member 144, in a manner similar to that described for the embodiment shown in FIG. 1, the pressure of the gas forces water out of the tube 122 through the bore 130 into the chamber 132 and out through the duct 134. The ball 170 floats forwardly in the projectile 100 as the water is forced out of the tube 122. When the water is completely forced out of the tube 122 the ball 170 engages against the surface 172 of the plug 124 closing off the bore 130 thereby preventing any further escape of gas. The manual valve of the gun is shut off after the pressure within the hollow projectile reaches the desired amount. The projectile is now ready for firing from the gun.
Thus, I have provided an improved hollow underwater projectile which is adapted to be fired beneath the surface of the water from a gas powered gun, and which can be loaded into the gun while the gun is submerged.
While the invention has been described in connection with two specific embodiments thereof it will be understood that it is capable of further modification, and this application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains and as may be applied to the essential features hereinbefore set forth, and as fall within the scope of the invention or the limits of the appended claims.
Having thus described my invention, what I claim is:
1. A projectile for use in a gas-operated underwater gun having a barrel, comprising an elongate tube which is adapted to have its rear end inserted in the barrel of the gun, said tube being open at its rear end whereby water may enter, and gas be admitted into said tube to propel the tube from the gun barrel, a plug closing the forward end of said tube, said plug having a duct formed therein communicating with the interior of said tube and opening to the exterior of said plug to discharge water from said tube when gas under pressure is admitted to the rear end of said tube to force the water out of said tube, anda floating member disposed in said tube and movable forwardly and rearwardly therein, said member being adapted to move forwardly with the discharged water by pressure of the gas admitted to the rear of said tube, and said member when in its foremost position closing olf said duct.
2. A projectile for use in a gas-operated underwater gun, comprising an elongate tube, said tube being open at its rear end whereby water may enter, and gas be received under pressure and being adapted to be mounted at its rear end in the gun, a plug closing the forward end of said tube, said plug having an axial duct formed therein and opening into the interior of said tube, said plug having a radial duct therein communicating at one end with said axial duct and communicating at its other end with the exterior of said plug for conducting water from said tube and plug upon introduction of gas under pressure into the rear end of said tube, a member threaded into said plug and extending forwardly beyond said plug, a floating member disposed in said tube and freely movable therein, an end member attached to said tube adjacent its rear open end for keeping said floating member in said tube, said floating member being adapted to be forced forwardly through said tube by gas pressure to close off said duct when the water has been expelled from said tube.
3. A projectile adapted to be fired by gas pressure from an underwater gun that has a barrel and that is adapted to hold a source of gas pressure, said projectile comprising an elongate tube adapted to have its rear end inserted in the barrel of the gun, and having means at its rear end for mounting and centering it in the barrel of the gun, said tube being hollow and forming a chamber for reception of gas from the source in said gun to propel the projectile from the gun, said tube being open at its rear end whereby water may enter, and gas be admitted from the source into said chamber, a plug secured in said tube at the forward end thereof and closing said tube at its forward end, said plug having a duct extending therethrough and communicating at its rear end with said chamber and at its other end with the exterior of said plug, for conducting water from said chamber upon introduction of gas under pressure into said chamber, and closure means movably mounted relative to said plug and movable on said projectile in opposite directions for opening and closing, respectively, said duct.
4. A projectile as claimed in claim 3, wherein said closure means comprises a rod that carries a piercing head at its forward end and that threads at its rear end into said plug, and that is manually adjustable in said plug selectively to open and close said duct.
5. A projectile as claimed in claim 3, wherein said closure means is mounted in said tube and is movable in said chamber under pressure of gas entering the rear end of said tube to close off said duct.
References Cited in the file of this patent UNITED STATES PATENTS 2,596,415 Kochner May 13, 1952 2,723,656 Andina Nov. 15, 1955 2,833,266 Mares May 6, 1958 2,957,468 Enfield Oct. 25, 1960 2,964,031 Dotson Dec. 13, 1960