Патент USA US2406730код для вставки
2,406,730 Patented Aug. 27, 1946 > ~ UNITEDv STATES PATENT OFFICE ‘ 2,406,730 vIBRA'roR _ Richard H. Whitehead, New Haven, Conn. Application September 16, 1939, Serial No. 295,248 3 Claims. (Cl. 58-417) 1 2 This inventionrelates to a vibrator element for use in rapid timing mechanisms, particularly where the timing mechanism is to be subjected to The plate B is thinner than the plates A, C and D and has a portion l3 over-hanging the edge of the escapement wheel II ‘and this over-hanging portion is connected across the center of the plate strong forces of rotation as for example timing to the other side of the plate at M to form a bridge l5 which carries a bearing l6 for a pivot ll of a shaft l8 which carries the vibrator l9. This vi fuses, the vibrator element is preferably placed at brator 19 carries a pair of downwardly extending the exact axis of the fuse so that the force of ro verge pins 20 and 2! which extend on opposite tation will act symmetrically upon it. Such vi brators have been provided comprising a single 10 sides of the bridge [5 into the path of the teeth 22 of the escapement wheel I I so that the vibra straight strip of spring material extending on both tion of the vibrator will move the verge pins to sides of the center line and having the length release the escapement wheel one tooth at a time thereof controlled to vary the timing of the fuse. in the usual manner. The vibrator itself is pref Such vibrators, however, are subject to unknown erably composed of two outwardly extending arms and uncalculable force when the fuse is ?red 23 and 24 which are balanced against each other with the shell by reason of the fact that the pro and move in a cut out portion 25 in the plates C pulsive charge introduces strong force along the and D. axis of the fuse and rotational accelerational The vibrator has an upper pivot 26 which has forces introduce complications. These forces are very large by reason of the fact that the fuse must 20 bearing. in another superposed plate which is omitted for the sake of clearness. attain a. rotational speed of 12,000 to 24,000 revo mechanisms employed for time fuses. In a mechanism of this kind, that is in time lutions per minute during the brief interval while the projectile is within the bore of the gun. It is an object of this invention to provide a vibrator which will maintain a uniform timing under all conditions of operation in the fuse and notwithstanding the large force to which it is subjected. In accordance with this invention the vibrator I9 is controlled by a hair spring 21 of hair pin form having its doubled end looped around a pin 28 carried by plate B having its legs extending on opposite sides of the shaft l8 and having its free ends attached to a block 29 slidable in a slot 30 in the plate A and having its position controlled by a radially disposed screw 3! screw threaded It is a further object to provide a fuse which can be timed by the rotation of a, single element. 30 into the block 29 and having an enlargement 32 ?tting within a recess 33 in the plates A and B. The invention accordingly comprises an article This recess is of such a character as to take the of manufacture possessing the features, properties end thrust of the screw and permit the hair and the relation of elements which will be ex spring to be brought under tension thereby. empli?ed in the article hereinafter described and As illustrated the block 29 has a lower portion the scope of the application of which will be in 34 of more or less square shape, ?tting within the dicated in the claims. slot 30 and having an upper portion 35 provided For a fuller understanding of the nature and with a recess 36 adapted to receive both ends of objects of the invention, reference should be had the free ends of the hair spring 21 and preferably to the following detailed description, taken in connection with the accompanying drawing, in 40 these free ends are turned outwardly as shown at 38. A wedge member 39 may be driven between which: the free ends of the spring 21 to hold the same Fig. 1 is a plan view of an escapement embody ing this invention. Fig. 2 is a section on the line 2—2 of Fig. 1. In the ?gure the characters A, B, C and D designate four plates, these being four of the in place and simultaneously to bear against the bent over ends 38. The shaft I8 is provided with projections 40 which extend outwardly on opposite sides of the plates of which the frame of the fuse itself is axis and which are so positioned that with the formed, the other plates not being illustrated be vibrator in the neutral position these projections lie between the arms of the spring 21, one on cause they form no part of the speci?c invention 50 each side of the center line. Any movement, here disclosed. however, of the vibrator will cause the projections The lower plate A is cut out as shown at In to 40 on one side to bow one leg of the spring 21 receive an escapement wheel II which is pivoted outwardly on one side and to bow the other in a bridge l2 in the plate A below the cut out side of the spring outwardly in the opposite di portion and is pivoted in its upper end in the plate D at apoint not illustrated. rection against the resiliency of the spring and 2,406,730 3 against the tension imposed on the spring by the screw 30. This resists the movement of the vibrator and tends to restore it to neutral posi tion. The period of vibration of the vibrator is of It is also to be understood that the following claims are intended to cover all of the generic and speci?c features of the invention herein de scribed, and all statements of the scope of the invention which, as a matter of language, might course determined by the weight of the vibrator be said to fall therebetween. and by the resilient pressure of the spring 21 Having described my invention, what I claim upon the projections =40. This timing may be as new and desire to secure by Letters Patent altered for adjusting purposes by screwing the is: screw 3| outwardly to impose more tension upon 10 1. A vibrator pivoted for vibration and having the spring arms or inwardly partially to relieve a flattened portion, a looped hair spring embrac the said tension. ing said ?attened portion in position to engage From the foregoing it will be clear that by , said flattened portion resiliently to resist rotation reason of the fact that the spring is held under of the vibrator and means to impose tension on tension by the screw 3|, the weight of the ma 15 said spring. terial of the spring 21 may be materially re 2. A vibrator element for time fuses or the like duced from that which would ordinarily be re ‘adapted to regulate the speed of movement of a quired, thus reducing the friction of the device and this lightening of the hair spring as well time fuse by regulating the speed of revolution of an' escapement wheel comprising in combi as the construction of the device tends to make 20 nation a vibratorelement constructed and ar ranged to operate verge pins in the path of the escapement wheel and having projections on op ' This device is, moreover, simple to construct posite sides of its axis, a looped‘ hair spring em andlreliable in operation. bracing said projections and means to impose ‘Since certain changes may be made in the 25 tension upon said hair spring, 7 above construction and different embodiments of 3. A device in accordance with claim 2 in which the vibrator more nearly free from the rotational forces above referred to. the invention could be made Without departing from the scope thereof, it is intended that all the portions of the looped hair spring are parallel to and substantially in contact with the surface matter contained in the above description or of said ?attened portion whereby on rotation of shown in the accompanying drawing shall be 30 said vibrator the outer edges of said ?attened interpreted as illustrative and not in a limiting portion engage said hair spring. sense. RICHARD H. WHITEHEAD.