Nov. 19, 1946. G. GRIMMINGER 2,411,156 AUTOMATIC ‘STABILIZER Filed March 26,1945 FIG. 1 21' I0 26 24 39 27 - 44 as I ‘ ' ||j 38 - 35 I2 ..29 1 ~ 28 30 > 32 1NVEN TOR.. GEORGE GRIMMINGER 11118 ATTORNEY Patented Nov. 19, 1946 . ZAlLiSt uuirs *s'r 2,411,156 AUTOMATIC s'rasrrrzsn George Grimminger, Washington, D. C.~ Application March 26', 1943, Serial No. 480,640 2 Claims. (Cl. 114-426) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 1 This invention is in automatic steering means, and is especially intended for use with an under water towed body in the nature of a torpedo equipped with a hydrofoil depressor. Towed bodies of the type mentioned are used >~ in antisubmarine warfare, but, in principle, the invention is not limited to such use. When so of ?n 54, receives the top of the rudder post ll. Below, the rudder post passes through a bearing journal E6, and into the torpedo. The lowerend of the post has secured thereto an arm or tiller is which extends forwardly, and in which is ar ranged a vertically depending crank pin 20. A washer ‘i9’ is shown on ‘the post ll between the journal it and the arm I!) for promoting ‘free movement therebetwee‘n. Hung from the top of the body ‘it, as by screws 2i and 22, is a bracket ‘23 provided with two used, however, the body, which may hereafter be termed a torpedo, is properly towed by means ‘of ya cable secured to the towing vessel, and is intended to be positioned astern of the towing longitudinally spaced members 24 and 25. vessel, and at depths which will vary with cir These members have aligned holes formed there cumstances. in to receive a clevis pin or pintle 26. ' Proper depth can be reached without great dif ficulty, by adjusting the length of the towing 15 Suspended for free oscillationon the pintle 26 is ‘a, pendulum, which comprises a bar 21 and a cable and the angle of the depressing planes of weight or bob 23. As shown, the bar is provided the torpedo to provide adequate negative lift, or with an ‘enlargement 29, serving as a stop, and depressing force. securing means 30 in the‘nature of a nut. ‘ The The problem of lateral stability, and thus also bob 28 has a vertical hole formed therein, and the maintenance of depth, is much more dimcult. is adapted to be slipped over the bar 21, and up Under tow, an antisubmarine torpedo of the na against the stop 2‘9, whereupon the parts are ture described soon begins to swing on the towing secured together by tightening the nut 30. cable out of its proper vertical relation with the It will be seen that the pendulum thus is towing ship. The action is progressive, and it is not uncommon, if normal speed is maintained, 25 adapted to swing transversely of the central ver tical longitudinal plane of the torpedo‘. for the torpedo to rise, outwardly, until it breaks Stops 3i and 32 are arranged in the lower por the surface of the water. tion of the body in the path of the lower end of The usefulness of devices of this kind, of the bar 21, and these stops limit the oscillation course, depends on their being towed at consid of the pendulum. erable depth. Numerous attempts have been A lever 34 extends from the pendulum bar 21 made to prevent the erratic behavior mentioned, to the depending pin 28 of arm I9. It is bifur but none has been entirely successful cated at its forward end, thereby forming the two The principal obj ect of this invention is to pro ?ngers 35 and 36 spaced apart slightly wider than vide means for maintaining the lateral and di rectional stability of a torpedo or similar body, 35 the diameter of bar 21. The lever is similarly forked at its after end, for cooperation with the said means comprising a simple pendulum and pin 20. . linking mechanism between the same and the Somewhat aft of the pendulum is arranged a rudder. supporting member 38. This is shown as an an Other objects will appear from a reading of 40 gle bar, though it may be of any desired construc the following speci?cation and claims. tion. The support is secured to the sides of the In the drawing, Figure 1 is a vertical longi shell It in any convenient manner, as by welding. tudinal section midway through the shell of a torpedo adapted for towing, only the after por tion of the torpedo being shown, and Figure 2 is A bolt 39, or similar member, is provided to serve as a fulcrum for the lever 34; and the lever, 45 where it passes support 38, has a Vertical open a section taken on line 2-2 of Figure 1. Referring to the drawing, It represents the ing formed therein to receive the bolt 39. Pref shell of a torpedo, the forward portion of which erably, reinforcing bosses, as 40 and M, strength may be assumed to be of normal streamlined en the lever at this point; and a ?ller block 42 form, and to be provided with a wing member is secured in the angle of member 38. To as of usual construction, and means for securing a 50 semble the structure shown, the fulcrum member towing cable. 39 is passed downwardly through a washer 44, At the stern of the torpedo are arranged hori and through the boss to, the lever 34, boss 4|, zontal ?ns or stabilizers H and I2, and. vertical washer 135, support 38, and ?ller block 42. It is ?ns l3 and I4, and aft of ?n M is a vertical then secured by a nut 43. Washers M and 45 55 rudder l5. A bracket l5, mounted on the top 3 2,411,156 assist in maintaining freedom of movement about the fulcrum. It will be seen that a movement of the pen dulum, to starboard for example, will produce 4 ing movement transversely of the central ver tical longitudinal plane of the body, a vertical rudder having a post extending into the,body aft of the pendulum, said post supporting said a like movement of the forward end of lever 34, Ul rudder for swinging movement into and out of the exact amount, relative to the movement of the said central vertical longitudinal plane of the pendulum bob, depending upon the point at the body, a tiller ?xed to and extending for which contact is made between the lever and bar wardly of said post, said tiller provided at its 27. The lever pivots on fulcrum 39, and its after end thus moves to port, producing, through its 10 forward end portion with a vertical crank pin, a bar ?xed transversely within said body inter cooperation with pin 29, a like movement of arm mediate the pendulum and the tiller and provided l9 and a rudder movement to starboard, with a vertical pivot, and a lever having forked In actual operation, of course, it is not intended forward and after ends respectively straddling that the pendulum move; rather, it is provided for the purpose of maintaining itself in true ver 15 said supporting bar and said crank pin, said lever being mounted for swinging movement tical relation. But any lateral movement of the about said vertical pivot, said bob being of a torpedo body will produce a relative change in mass su?‘icient to control the rudder without the pendulum position which will result in a rudder aid of any power source, said pendulum upon movement opposing the lateral movement of the torpedo. Thus, should the torpedo swing to port, 20 alignment with said central vertical longitudinal plane so disposing said lever as to align said the pendulum will move e?ectively or relatively rudder with said longitudinal plane, and said to starboard, and the other parts will react as pendulum upon transverse swinging movement in explained in the preceding paragraph to bring either direction imparting movement to said lever the torpedo back to proper course. to swing said rudder in a corresponding direc 'The above description is in speci?c terms. It 25 tion. is not intended, however, to restrict the inven 2. In a towed underwater body, the means tion to the exact structure shown and described; but for the true limitations of the invention, reference should be had to the appended claims. recited in the preceding claim, said body being of conventional streamline form having a trans This invention may be manufactured and/or 30 versely curved inside surface, and transversely spaced abutments ?xed within said body in the used by or for the Government of the United States of America without the payment to me of any royalty thereon or therefor. I claim: 1. In a towed underwater body, means auto matically maintaining lateral and directional sta bility comprising a pendulum including a sup porting bar and a bob, a bracket in the top of the body for supporting the pendulum for swing path of travel of said pendulum to limit move ment of said pendulum in either direction from said central vertical longitudinal plane so as to 35 prevent denting or wedging engagement of the pendulum bob: with the transversely curved in side surface of said body. GEORGE GRINHVEENGER.