Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
  • F41J9/00—Moving targets, i.e. moving when fired at
  • F41J9/16—Clay-pigeon targets; Clay-disc targets
  • F41J9/18—Traps or throwing-apparatus therefor
  • F41J9/20—Traps or throwing-apparatus therefor with spring-operated throwing arm

Definitions

• the present invention relates to the field of target launchers for sport shooting disciplines. It finds a particularly advantageous application in disciplines such as clay pigeon shooting and related activities.
• the thrust In order for the ejection to occur, the thrust must be strong enough to allow a shooter to try his luck. The thrust may tend to break the target. Indeed, for these disciplines the projectiles used are particularly fragile in order to fulfill their function.
• One of the challenges of solutions in this area is to allow ejection over a long distance without breaking the target. For this, coverings or damping elements are positioned at the end of the arm.
• patent application FR2696538A1 in which is disclosed a device for launching targets for shooting comprising a launching plate on which is positioned at least one target, a launching arm comprising a damping element, and configured so as to be rotatable along an axis relative to the launch plate, the arm being set in accelerated motion by means of a spring which triggers movement until contact between the damping element and the target, and finally ejection.
• the projection of the target is due in particular to the angular acceleration of the throwing arm.
• the arm rotates 360 degrees from an original position. The initial speed is then zero and the acceleration occurs over a first angular sector of about 130 degrees.
• the target rolls along an elastomer attached to the arm to its end where the target is ejected.
• the energy used generally comes from the relaxation of a spring.
• a connecting rod can ensure the connection between the spring and the arm.
• the tensioning of the spring can be done by a geared motor whose end is in contact with the connecting rod.
• the relaxation of the spring is generally caused by exceeding a balance point.
• One of the challenges of these launch systems is to increase the ejection distance.
• One solution consists in increasing the speed of rotation by increasing the stiffness of the spring. But this requires increasing the power of the geared motor as well as strengthening the freewheel.
• Another technical solution is to increase the length of the arm. Since the arm is generally a solid section of rectangular section and made of an aluminum alloy, the increase in this is accompanied by an increase in its mass at the periphery and increases the inertia of the mechanism which can lead to to system instability.
• An object of the present invention is therefore to propose a solution which makes it possible to improve the throwing phase, and in particular to increase the ejection distance without increasing the power of the geared motor while preserving good stability of the device, or even to to operate a projection over usual distances under better conditions, for example by reducing the flexion of the arm or its inertia, or even the power of the reduction motor.
• a target launching device comprising a support, an arm and a plate, in which the arm is articulated in rotation with respect to the support according to an axis of rotation A z , directed in a direction of rotation (z), so as to be able to eject a target placed on the plate, and in which the arm comprises:
• an elongated organ presenting: i. a length dimension extending along a direction of extension x perpendicular to the direction of rotation z, ii. a width dimension extending along a transverse direction y, perpendicular to the direction of extension x and perpendicular to the direction of rotation z, iii.
• the elongated member comprises at least one section along its length dimension having, in section along a plane perpendicular to the direction of extension x, a first recess and a second recess arranged on either side of a core, the core being directed in the direction of rotation z and in which the damping element is fixed in the first recess.
• the inertia of the arm is reduced by reducing its mass. This reduction in mass is the consequence of a first recess and a second recess.
• the dimension of the arm can be kept according to the direction of extension x.
• the damping element is advantageously positioned and fixed in the first recess.
• the device makes it possible to avoid changing material and advantageously allows identical resistance to bending.
• the device therefore preferably makes it possible to obtain an increase in the projection distance of a target thrower by reducing the mass of the throwing arm.
• an object is to provide an improvement to the throwing arm.
• Figure 1A shows an example of a prior art target launcher.
• Figure 1B shows an example of a launch zone of a prior art target launcher.
• Figures 1C to 1D show a zoomed sectional view of an example of a launch zone of a prior art launcher.
• Figure 2A shows a simplified device with a throwing arm comprising an elongated member and a damping element.
• Figures 2B to 2C show a sectional view of a launching arm of the simplified device of Figure 2A, with the arm alone in Figure 2B and with the damping element configured to be positioned against the elongated member in Figure 2C .
• FIG. 3A shows a simplified device according to the present invention with a throwing arm comprising an elongated member and a damping element.
• FIGS. 3B to 3C represent a cross-sectional view of a throwing arm of the simplified device of FIG. 3A with the damping element configured to come into position against the elongated member.
• Figure 3D represents a sectional view of the damping element and its different functional zones.
• FIG. 4 represents a zoomed sectional view of an example of a launch zone of a launcher according to the present invention.
• Figure 5 shows two elongated members according to the present invention.
• the elongated member 210 comprises a first wing 214, a second wing 215, a third wing 216 and a fourth wing 217, the wings being directed in the transverse direction y.
• the first wing 214 comprises a first internal wall 214a
• the second wing 215 comprises a second internal wall 215a
• the first recess 211 extends along the direction of extension x and is delimited by the first internal wall 214a, by the second internal wall 215a and by a central wall 213a extending from the first internal wall 214a to the second internal wall 215a.
• the damping element 220 comprises a mounting portion 222 and a contact portion 221, such that the mounting portion 222 comprises coupling surfaces 222b, 222c configured so as to be able to cooperate by coupling with the first internal wall 214a and an abutment wall 214c of the first wing 214, in particular in order to allow the positioning of the damping element 220 in contact with a slice of the first wing 214.
• the damping element 220 is made of an elastomeric material such as, for example, EPDM 70 Shore and extends along the direction of extension x and/or the elongated member 210 is made of an alloy of aluminum such as an alloy (AlZns, 5MGCu) 7075..
• the dimension of the arm Z200 is equal to the height dimension of the elongated member Z210, preferably equal to 12 mm.
• the elongated member 210 has a lower face 210b and the damping element 220 has a lower damping face 220b so that the lower face 210b and the lower damping face 220b are coplanar.
• the elongated member comprises a section that varies in width and decreases as it moves away from the axis of rotation Az.
• the contact portion 221 comprises a planar contact surface 221c, configured to be oriented towards the inside of the rotational movement of the throwing arm 200 during the ejection phase of the target 300, and perpendicular to the transverse direction y.
• the core 213 is a parallelepiped plate comprising a median plane parallel simultaneously to the direction of extension x and to the direction of rotation z, and the elongated member 210 is a part having a shape symmetry along said plane median.
• the distance between the first internal wall 214a and the second internal wall 215a is greater than 4 mm, preferably greater than 6 mm and preferably greater than 8 mm.
• the thickness of the core 213 is equal to the respective thickness of the four wings 214, 215, 216, 217, preferably equal to 2 mm .
• radial orientation or “radially” will be understood to refer to the positioning of a mobile element in rotation with respect to an axis.
• a direction substantially normal to a plane means a direction having an angle of 90 ⁇ 10° relative to the plane.
• the term mobile corresponds to a rotational movement or to a translational movement or to a combination of movements, for example the combination of a rotation and a translation.
• a unitary one-piece part cannot therefore be made up of two separate parts.
• the term "united" used to qualify the connection between two parts means that the two parts are linked/fixed with respect to each other, according to all the degrees of freedom, except if is explicitly specified differently. For example, if it is indicated that two parts are integral in translation along an X direction, this means that the parts can be movable relative to each other except along the X direction. In other words, if one moves a part along the X direction, the other part performs the same movement.
• a target launching device 300 comprising a support 100 on which a plate 110 is positioned.
• a launching arm 200 is articulated in rotation with respect to to the support 100 and along an axis of rotation Az.
• the target 300 is capable of being positioned on the plate 110.
• a spring system preferentially triggers an accelerated movement of the throwing arm 200 in the direction of rotation z and thus drives the throwing arm 200 into contact with the target 300.
• This contact can be related to a push, in which a transmission of kinetic energy takes place from the arm towards the target 300 in order to allow a projection of the latter according to a predetermined trajectory.
• the throwing arm 200 includes a damping element 220 configured to be preferably positioned at the end of the arm in order to dampen the contact between the throwing arm 200 and the target 300 and thus create a grip surface. Without the presence of the damping element 220, the contact between the throwing arm 200 and the target 300 can cause the target 300 to break. Indeed, this type of device is intended for throwing targets 300 for sports shooting and these targets 300 are made of a brittle material which must be able to burst into several pieces, in contact with a projectile which may be a sheaf of lead.
• a launch zone 112 is limited vertically between a barrel support plate 113 and the plate 110, and horizontally between a comma 111 and the launch arm 200.
• the target 300 tends to get stuck between the barrel support plate 113 and the comma 111 and in these cases, the target 300 generally breaks under the action of the throwing arm 200 in the throwing zone 112. As illustrated in FIG. 2A and according to a simplified example of the prior art, it may be a throwing arm 200 in which we find the elongated member 210 and the damping element 220.
• the support 100 is preferably fixed relative to the ground at the time of the launch phase. In FIG. 2A, it is possible to see the cooperation between the damping element 220 and the elongated member 210 distributed along the direction of extension.
• the elongated member 210 is a part which extends between a pivot joint allowing rotational movement with the support and a free end configured to be able to fix a damping element 220
• the elongated member 210 can be a solid section, optionally of constant rectangular cross-section and made of a rigid material, such as for example a metal alloy.
• the damping element 220 is positioned below the elongated member 210.
• the damping element 220 comprises at least one face, in plane contact with the elongated member. 210.
• the latter two are configured to be in plane-to-plane contact via two respective adjacent surfaces.
• the damping element 220 is positioned under the throwing arm 200 so that it can touch the plate 110 in order to be able to allow the best possible contact during its contact with the target 300. Such positioning of the element damping 220 on the elongated member 210 increases the height dimension Z200 of the arm.
• the present invention makes it possible to increase the speed of the arm by reducing its mass. This reduction in mass is the consequence of a first recess 211 and a second recess 212.
• the dimension of the throwing arm 200 remains unchanged with respect to the solution of the prior art according to the direction of extension x.
• the damping element is advantageously positioned and fixed in the first recess 211 .
• the throwing arm 200 articulated in rotation with respect to the support 100 along the axis of rotation A z comprises an elongated member 210 and a damping element 220, both mounted integrally.
• the elongated member 210 in section along a plane perpendicular to the direction of extension x, the elongated member 210 comprises a first recess 211 as well as a second recess 212 distributed around a core 213.
• the elongated member 210 comprises a first wing 214, a second wing 215, a third wing 216 as well as a fourth wing 217 distributed around the core 213.
• This distribution is preferentially homogeneous so that the first wing 214 and the second wing 215 are symmetrical with respect to the third wing 216 and the fourth wing 217.
• the damping element 220 comprises a contact portion 221 and a mounting portion 222.
• the mounting portion 222 is configured so that it can be positioned at the first wing contact 214.
• the first wing 214 includes a first internal wall 214a and the mounting portion 222 includes a first mating surface 222b configured so that the first internal wall 214a comes into plane-to-plane contact with the first mating surface. 222b.
• the first wing 214 comprises an abutment wall 214c and the mounting portion 222 comprises a second mating surface 222c configured so that that the abutment wall 214c comes into plane-to-plane contact with the second mating surface 222c.
• the cooperation between the damping element 220 and the elongated member 210 is advantageously optimized such that the elongated member 210 comprises a lower face 210b and the damping element comprises a lower damping face 220b so that the lower damping face 220b and the lower face 210b are preferably coplanar when the damping element 220 is secured to the elongated member 210.
• the damping element 220 comprises a contact portion 221 and a mounting portion 222.
• the contact portion 221 comprises a contact surface 221c configured to be in contact with the target 300 during of the ejection phase of the target 300.
• the contact between the first wing 214 and the damping element 220 comprises at least one contact by the edge of the first wing 214, so that the forces applied by the reaction of a target during the projection on the damping element 220 is taken up, behind, by said edge. And thus a compression deformation of the damping element 220 at this level, which makes its arrangement more reliable relative to the target.
• the contact is plane on plane.
• a contact perpendicular to the direction in which the damping element 220 is stressed by the target can be set up between the first wing 214 and the damping element 220, in particular at the level of the surface 222b. This aspect makes it possible to benefit from a potentially large bearing surface between these two elements.
• the contact is plane on plane.
• the height dimension of the arm Z200 is equal to the height dimension of the elongated member Z210.
• the space between the plate 110 and the barrel support plate 113 can also be reduced which makes zero the probability of jamming of the target 300 between the barrel support plate 113 and the point 111.
• the height dimension of the damping element Z220 is less than or equal to the height dimension of the elongated member Z210 so that when the damping element 220 is positioned and is held in position with the elongated member 210, the damping element 220 does not protrude beyond the elongated member 210, in the direction of rotation z.
• the volume of the launch zone 112 is advantageously reduced and a target 300 can no longer get stuck there. Consequently, destruction of the target 300 within the launch zone 112 is avoided and, as a result, a maintenance operation to restore the machine to working order is also avoided.
• the present invention does not require a change of material and offers identical resistance to bending.
• the elongated member 210 is made of a metallic material.
• it may be an aluminum alloy, preferably of the “7075” type, the Young's modulus of which is preferably equal to 72 N.mnr 2 .
• the elongated member 210 is a unitary one-piece piece. Furthermore, from the contact between the throwing arm 100 and the target 300, the free end of the arm results in a normal component force oriented along the direction of rotation z. The throwing arm 100 must therefore structurally oppose this normal stress resulting from a bending moment.
• the first recess 211 and the second recess 212 are identical and distributed symmetrically on each side of the core 213.
• the thickness of the core is equal to the thicknesses of the first wing 214, of the second wing 215, of the third wing 216, as well as of the fourth wing 217.
• this thickness can be equal to 2 mm.
• the elongated member 210 has a height dimension Z210 along the direction of rotation z equal to 12 mm and/or has a width dimension along the transverse direction y equal to 30 mm.
• the damping element 220 has a height dimension Z220 along the direction of rotation z equal to 6 mm.
• the elongated member 210 has a full rectangular section with height over width dimensions equal to 10 mm ⁇ 30 mm, a length of 342 mm and a mass of 358 grams.
• This elongated member 210, along the direction of extension x is subjected to bending over a length of 307 mm. This results in a quadratic moment l x of 2500 mm 4 with a maximum deflection at the end of the arm equal to 0.64 mm.
• wings 214, 215, 216, 217 distributed symmetrically with respect to the core 213. And in which the thicknesses of the wings and of the core 213 are constant and equal to 2 mm, then the quadratic moment l x is equal to 3125 mm 4 with a maximum deflection at the end of the arm equal to 0.51 mm.
• the present invention allows in addition to a reduction of the mass, also a better resistance to the stress resulting from the bending moment.
• the assembly portion 222 for its part comprises openings so as to be able to allow the solid connection of the damping element 220 with the elongated member 210.
• this assembly is carried out using elements fastening which may optionally be threaded elements, in particular by screwing.
• the damping element 220 is fixed to the elongated member 210 using an adhesive.
• the throwing arm 200 is advantageously driven in rotation by a system of the crank rod type itself connected to a spring system, itself actuated by a motor.
• a system of the crank rod type itself connected to a spring system, itself actuated by a motor.
• the speed of the target 300 at the end of the plate 110 can reach 109 km/h.
• a projection distance of 70 m is thus obtained.
• the speed of the target 300 at the end of the plate 110 can then reach 119 km/h.
• a projection distance of approximately 95 meters is thus obtained, i.e. a gain of 25 meters.
• the throwing arm 200 comprises in its part able to be positioned close to the axis of rotation a base 218. Moreover, in order to allow a more distant projection of a target, it is also possible in combination with the present invention to extend the length of the throwing arm 200 along the direction of extension x. A larger throwing arm 200 generally results in a greater deflection at the end of the arm due to a greater bending moment. To overcome this mechanical deformation, the present invention proposes a section of the base 218 that is wider in the transverse direction y.
• the third wing 216 comprises a third internal wall
• the fourth wing 217 comprises a fourth internal wall 215a
• the second recess 212 extends in the direction of extension x and is delimited by the third internal wall, by the fourth internal wall and by a second central wall extending from the third internal wall 214a to the fourth internal wall.
• the damping element 220 is made of an elastomeric material which extends like a profile along the direction of extension x and/or the elongated member 210 is made of an aluminum alloy.
• the contact portion 221 comprises a planar contact surface 221c, configured to be oriented forwards in the direction of rotation.
• the articulation of the throwing arm 200 with the support 100 allowing rotation in the direction of rotation z is positioned at a first end of the throwing arm 200 and the damping element 220 extends from a second end of throwing arm 200.

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• Toys (AREA)
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• 2021
  • 2021-03-03 FR FR2102062A patent/FR3120433B1/fr active Active
• 2022
  • 2022-02-28 WO PCT/EP2022/055004 patent/WO2022184649A1/fr active Application Filing
  • 2022-02-28 EP EP22708162.7A patent/EP4302046A1/de active Pending

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