LOCKING DEVICE, E.G., FOR WEAPONS OR THE LIKE

Abstract: A locking device, e.g., for weapons or similar with an elongated hollow body intended to fit into the barrel of the weapon or a similar item with a small clearance. The body is provided with at least two telescoping parts, a locking device inserted in the body during telescoping achieving an expansion of one of the parts in such a way that the body is fixedly locked in the barrel. The locking device is adapted to act on various blocking means (19) arranged around the periphery of one of the parts (16). The other part (10) has an expelling means (14) pressing the blocking means radially outwards against the inner barrel mantle surface when the parts are telescoping. The expelling means (14) is then provided with a design adapted to press the blocking means (19) against the barrel mantle surface during any transfer of the body within the barrel, e.g., in an attempt to press the body locking device out of the weapon.

Description: Locking device , e . g . for weapons or the like The present invention relates to a locking device, e.g. for weapons or simi¬ lar items, the locking device comprising an elongated hollow body intended to fit into the barrel of the weapon or a similar item with a small clearance, said body being provided with at least two telescoping parts, a locking device inserted in the body during telescoping achieving an expansion of one of the parts in such a way that the body is fixedly locked in the barrel. In a locking device of this type known from GB-A-2,234,047 one of the parts is provided with a slotted ring with an inner tapered shape, the other part having a tapered pin, against which the ring is resting. When rotating the locking device so that the parts are pushed together, the ring travels up on the tapered pin and expands radially towards the inner barrel mantle surface, whereby the body is fixedly locked in the barrel. When the key is removed from the locking device the weapon thus becomes unusable by means of the body locked in the barrel. At the opposite end of the locking body from the locking device a releasing device is arranged, which by means of an explosive charge shoots a number of locking pins against the inner barrel mantle surface with a sufficiently high pressure at this end applied on the locking body. It has been proved that the known locking device has certain disadvantages. The ring expansion against the inner barrel mantle surface is performed by cont¬ racting the two locking barrel parts a predetermined length, e.g. by means of a threaded joint, the parts then being relatively immobile. By this the ring expands with a certain predetermined force not to let the barrel been damaged by identa- tions or similar. This means that also the friction keeping the body locked in the barrel is limited. It has therefore under certain conditions been impossible to shoot the locking body out of the barrel. The release of the explosive charge is perfor¬ med by means of a piston acting on two springs to provide a pressure sufficiently large to project the piston powerfully against the charge. However, it has in prac¬ tice been proved that an impact force has to be applied on the piston to release the charge, whereas a regular pressure applied against the locking body end enables to press the locking device out of the barrel without releasing the charge. The main object of the present invention is to remove the weak points of the known locking device and to provide a locking device which cannot be removed from the barrel by pushing the locking device out from the barrel. These and other objects are achieved according to the present invention by provididng the locking device with the characteristics specified in the claims to follow. The invention is described here below in connection with the drawings showing an execution example of the locking device. Figure 1 shows a longitudinal section of a locking device according to the inven¬ tion, Figures 2a to 2e show various positions of the locking device for different lock¬ ing conditions, Figure 3 shows a longitudinal section of a torque key to lock the locking device, Figure 4a shows a cross ection of the torque key of figure 3 along the line IV-IV, and Figure 4b shows the cross section of figure 4a for another operating position of the torque key. The locking device shown in figure 1 includes a locking part or a central casing 10 with a bottom hole, in which a piston 11 is movably mounted with a conical shape between its end portions providing a bearing surface against the bottom hole. A number of pins 13 bearing radially movable in radial holes against the narrowest portion of the piston 11 are resting on the central casing 10. The pins 13 being numerous, e.g. six, are equally spread around the periphery of the central casing 10 with such a length that their outer end facing from the piston is lying just inside the outer circumference of the central casing, the pins 13 being kept in place by means of a fixating bushing 12. Behind the piston 11 a bushing 8 is provided in the bottom hole, in which a cartridge 9 is placed and a guiding sle¬ eve 7 for an impact pin 4 is lying behind the bushing 8. The bushing 8 and the guiding sleeve 7 are placed within a sleeve 5 surrounding one end of the central casing 10 and also providing a guide for the impact pin 4. Between the impact pin 4 and a domed sleeve 1, glidingly mounted with a little clearance around the sle¬ eve 5, an impact spring 2 is provided resting with one end against a pin cap 3 within the domed sleeve 1 and with the other end against the impact pin 4. The domed sleeve 1 loaded by the spring 2 grips with a downwards bent end around the wedge of the sleeve 5 keeping the domed sleeve 1 in position against the spring force. The pin cap 3 is rounded off as well as the end of the domed sleeve 1 so that they might be relatively rotated. The impact spring 2 is preloaded and acts on the impact pin 4 with a predetermined force so that the impact pin 4 is kept in position by means of one or several breakpins 6. The described device operates in such a way that the impact pin 4 is relea¬ sed when a least specified axial force is applied against the * domed sleeve 1. In¬ dependent of the application speed and/or rotation when trying to drill away the locking device the breakpin 6 is sheared off and releases the energy stored in the impact spring 2 thereby thrusting the impact pin 2 against the cartridge 9. The inserted somewhat preset impact spring 2 provided with the pin cap 3 on the in¬ side of the dome of the domed sleeve 1 and the clearance between the doomed sleeve 1 and the sleeve 5 provide an effective protection, also when the whole doomed sleeve 1 rotates, manufactured in a material hardly affected by a drill. The guiding sleeve 7 together with the sleeve 5 provides a linear motion of the impact pin 4. The other, right end of the central casing 10 in figure 1 is attached to a cylindrical casing 16, in which is provided a lock cylinder of a type known per se. The lock cylinder 17 has a central dowel 18 in a hardened material, such as har¬ dened steel, the central dowel 18 preventing anybody to drill into the locking device to reach any part there behind. The lock cylinder 17 engages with a ridge a groove in the head of a screw 22, in its turn being threaded into a recess provided with an insert thread 15. The recess is positioned at the end of the first locking part or the central part 10, protruding with a at said end arranged dowellike elongation into the cylinder casing 16. The lock cylinder 17 is submersed into the casing of the locking part 16 and is fixed against pulling-out by means of a fixa¬ tion pin 23 becoming inaccessible when the locking device is inserted into the barrel (not shown) of a weapon or a similar item. Between the head of the screw 22 and the bottom of the cylindrical casing 16 a friction element 21 is provided in form of a washer and a compressible packing. Alternatively, the friction element 21 is replaced by a spring with a suitable shape and spring force. During assembly the driving screw 22 is coupled without any clearance to the lock cylinder 17 and is preset against the friction element 21 in the cylinder casing 16, the lock cylin¬ der 17 being fixated by means of the hardened pin 23. The lock cylinder 17 pro- vides a butt feeling and is effectively eliminating any possible unpicking. At the end of the cylindrical casing 16 facing the locking part or the central casing 10 a ball retainer 20 is provided with several balls 19 around the periphery of the dowellike prolongation of the cylindrical casing 16. Said dowellika pro¬ longation or end of the cylindrical casing is around its periphery provided with or sahped as a ramp 12 increasing tapered in diameter in a direction from the cylindrical casing 16. When inserting the locking device in a gun barrel G or a similar item in accordance with figures 2a and 2b the balls 19 will during a rota¬ tion of the lock cylinder 17 and thereby a contraction of the lock parts 16 and 10 travel up on the ramp and by means of friction against the gun barrel G inner mantle surface keep the locking device in position in the barrel in accordance with figure 2c. The ball retainer 20 is movably suspended with a small clearance 24 in that a circumcising flange 25 on the ball retainer engages a likewise cir¬ cumcising recess 26 in the cylindrical casing 16 in accordance with figures 2a to 2e. When inserting the locking device in the gun barrel according to figure 2a the ball retainer flange 25 is pushed to the left, whereas it after an insertion and rota¬ tion of the lock cylinder 17 moves to the right in the recess 26 to contact the right recess wall, as shown in figures 2b and 2c. If somebody forcibly engages the locking device to drag it out of the gun barrel the balls 19 will travel further up on the ramp 14 according to figure 2d and are more heavily pressed against the inner barrel mantle surface. During a continued withdrawal the balls 19 will travel even further up on the ramp 14 as the ball retainer flange 25 is moved to the left in the recess 26 according to figure 2e, the balls then being pressed into the gun barrel material and any withdrawal of the locking device being made impossible by means of the balls 19 contacting the central casing wall, where the central casing 10 transits to its tapered end. In this position also the ball retainer 20, made of a simpler material such as plastics or similar, might have burst in accordance with figure 2e. Thus the ball retainer 20 is pressing the balls 19 against the taper 14 and the cylindrical wall for the cartridge position with an axial motion achieved by means of rotation via the locking cylinder 17, the driving screw 22 and a specified tor¬ que. An axial locking effect is provided in the locking device withdrawal direction and, moreover, the balls 19 achieve a rotation of the complete locking device when radially damaged. The balls will of course, in an effort to expel the locking device by means of pressure applied on the domed sleeve 1, travel up on the ramp 14 and lock 13 the locking body 10, 16 in the gun barrel or similar in cooperation with the released pins. The cylindrical casing 16 is conveniently provided with a length as to e.g. for a shot-gun makes it impossible to fold up the barrel and the stock illustrating an unloaded and unusable weapon not possibly to be used to threaten any person. The fixating pins 23 are heattreated " and not demountable, making a drilling out impossible both radially and axially in its operating direc¬ tion. In figures 3, 4a and 4b a torque key is shown to act on the lock cylinder 17. Figure 3 shows a longitudinal section of the torque key including a casing 37, in which a central shaft of a sleeve 42 is mounted, in which sleeve 42 the key is in¬ serted for the locking device 17. The mounting is achieved by means of two fibre washers 39, 40 and the central shaft is retained in the casing by means of an in¬ dexing wheel 38.A screw 34 is inserted in the central shaft and a spring 36 is pla¬ ced between the head of the screw 34 and the indexing wheel 38, the spring res¬ ting on the head of the screw 34 by means of a washer 35. At the opposite end of the house 37 facing the sleeve 42 a cover 32 is mounted and on it a marking plate 31. In the cover 32 a locking wire 33 is stretched continuing into the casing up to and passing the indexing wheel 38, the free end of the locking wire 33 running in a radial groove 43 in the casing 37. Said free end of the locking wire 33 in the groove 43 can engage one of the tooth gaps of the indexing wheel 38 by means of a button 41, as shown in figure 4b, illustrating as well as figure 4a a cross section of the torque key casing 37 along line IV-IV. Thus, figure 4a shows the position with the locking wire 33 engaging the indexing wheel 38. The torque key described above operates as follows: As already mentioned above the key for the locking device 17 is inserted in the sleeve 42 and the torque key casing 37 providing a hand grip is turned until a desired torque is achieved, the locking device locking elements or balls 19 then being pressed against the gun barrel with the desired locking force, as shown in figure 2c. With this torque the friction between the washers 39, 40 and the casing 37 is overcome and the casing or the hand grip 37 is rotated, the sleeve 42 and the inserted key (not shown) remaining fixed. For detaching the key from the locking device the button 41 is pressed in so that the locking wire 33 engages one of the tooth gaps of the index¬ ing wheel 38, the casing 37 then being rotated against the locking direction until the key can be removed from the locking cylinder 17. The torque key described above might of course also be used for other pur¬ poses such as tightening small screws, nuts, etc, a corresponding tool then to be inserted in the sleeve 42. For adjusting a desired torque the screw 34 might be prolongated to a position above the cover 32 and the casing' 37 be provided with a convenient scale, on which e.g. the position of the supoting washer 35 of the spring 36 can be read.

Claims: C L A I M S 1. A locking device, e.g. for weapons or similar items, the locking device comprising an elongated hollow body intended to fit into the barrel of the weapon or a similar item with a small clearance, said body being provided with at least two telescoping parts, a locking device inserted in the body during telescoping achieving an expansion of one of the parts in such a way that the body is fixedly locked in the barrel, characterized in that the locking device is adapted to act on a number of locking means (19) arranged around the periphery of one part (16), the other part (10) comprising an expelling means (14), during a mutual displace¬ ments of the parts pressing the locking elements radially against the inner barrel mantle surface, the expelling means (14) being designed to press the locking means (19) more tightly against said mantle surface, when the body is moved within the barrel. 2. A locking device according to claim 1, characterized in that the locking means (19) have a ball shape and that the expelling means is a tapered ramp (14), on which the balls are moved during a mutual displacements of the locking parts (16, 10). 3. A locking device according to claim 1 or 2, characterized in that the locking means (19) are arranged in a retainer (20) being movably suported with a small clearance in one part (16) of the locking body. 4. A locking device according to claim 1, 2 or 3, characterized in that one of the locking parts (16) comprises a screw (22) rotatably suported in the locking part and engaging a threadened bore in the other locking part (10) and acted on by a locking cylinder (17) immersed into the locking part (16) and fixated against any axial withdrawal by means of a fixation pin (23), the screw (22) being without any clearance attached to the locking cylinder and preloaded against a friction element (21) in the locking part (16). 5. A locking device according to anyone of the claims 1 to 4, characterized in that the locking device (17) has a hardened, rotatably supported central dowel (18) protecting any parts behind it from drilling attacks. 6. A locking device, e.g. for weapons or similar items, the locking device comprising an elongated hollow body intended to fit into the barrel of the weapon or a similar item with a small clearance, said body being provided with at least two telescoping parts, a locking device inserted in the body during telescoping achieving an expansion of one of the parts in such a way that the body is fixedly locked in the barrel, the other part comprising a releasing device expelling by means of an explosive charge a number of locking pins radially against the inner barrel mantle surface, when a pressure is applied on said other part, characterized in that the explosive charge (9) is released by means of an impact pin (4) being by means of a spring (2) preloaded against a safety pin (6), which at an increased pressure on the springloaded impact pin is broken, the impact pin (4) by means of the spring tension then being thrown against the charge (9). 7. A locking device according to claim 6, characterized in that the spring (2) is positioned between the impact pin (4) and a domed sleeve (1) being movably suported with a small clearance on the locking body (10, 5) and the spring resting on said domed sleeve via a pin cap (3) enabling the domed sleeve to rotate in relation to the spring and the impact pin. 8. A locking device according to claim 6 or 7, characterized in that it comprises a locking device according anyone of the claims 1 to 5. 9. A torque key for tightening locking means, characterized by a casing (37), in which a retainer (42) for the locking means is suported by means of a springloaded (36) friction suport (39, 41), the spring force and thus the friction torque being adjustable to set the friction suport free at a predetermined torque in the casing (37). 10. A torque key according to claim 9, characterized in that the spring load acts on an indexing wheel (38) positioned in the friction suport to be locked in the casing (37) by means of a locking wire (33), one end of which is steadily fixed to the casing (37), the other end of which passing the indexing wheel and guided radially movable in a radial groove (43) in the casing (37), said other end by means of a button (41) possibly engaging the indexing wheel to rotate it together with the casing (37) in the locking direction or reversibly.

Inventors: BOGSTROEM ROLF, BOGSTROEM, ROLF
Applicants: BOGSTROEM ROLF, BOGSTROEM, ROLF
Application year: 1995
Main classification: F41A17
IPC codes: F41A17