EP0333144B1 - Cocking mechanism for an air gun - Google Patents

Description

The invention relates to a tensioning device for a compressed air weapon with precompressed air, wherein on the pressure piston a tensioner mounted pivotably on the system of the weapon in a fixed linkage point engages via a linkage, the lever ratio of which increases with increasing compression force, furthermore a rod connected to the piston points a linkage point has, in which one end of a steering lever is articulated on the rod, the other end of which is fixed in a weapon-fixed pivot point, and finally the connection of the rod to the actual piston can take place in a further pivot point.

In a known tensioning device for compressed air weapons of this type (DE-C-35 10 087), the tensioner is fixed at one end to the weapon in a fixed articulation point. At an intermediate point, a coupling or a connecting rod is articulated on the tensioner, which is connected at the other end to the pressure piston running in the pressure cylinder. The tensioner has a backdrop in which the articulation point at the end of the coupling or connecting rod is displaceably guided. This ensures that the lever ratio increases with increasing compression force. Towards the end of the clamping stroke, the tensioner thus causes shorter travel of the pressure piston in the cylinder for the same swivel angle. This is advantageous and is achieved here with the sliding guide that has been used for a long time.

However, the unfavorable friction conditions of this sliding guide are disadvantageous. Furthermore, the known tensioners also require considerable space and also result in lever lengths which can no longer be accommodated in the case of short compressed air weapons, such as compressed air pistols.

The object of the invention is therefore to propose an articulated linkage for the clamping device in the defined Friction conditions with a small space requirement on the weapon and for the linkage are combined.

This object is achieved in the tensioning device mentioned above by the characterizing features of claim 1. Advantageous developments of the invention are characterized in the dependent claims.

It can be seen that the unfavorable conditions explained here are avoided in that the sliding guide is replaced by a further toggle lever which is formed by an additional coupling member and an additional joint. This additional coupling element and a steering lever connect the tensioner and the piston rod or the connecting rod to one another. This results in an advantageous effect in such a way that in the low pressure range, i.e. at the start of the tensioning process for a certain swivel angle of the tensioner, large distances are covered, but towards the end of the tensioning process, i.e. in the high pressure range, only small distances are covered for the same swivel angle. As a result, the clamping process is optimized for the user in that a uniformly low clamping force must be applied to the clamp. This is decisively supported by the frictional conditions on the six-point kinematics, which are favorable compared to sliding guides.

With this construction, it is also possible to combine the system-specific articulation points of the tensioner and the steering lever. This further reduces the space required on the weapon and for the linkage of the clamping device.

The provision of tooth segments which are effective in the high-pressure region and mesh with one another towards the end of the clamping stroke means that the forces which occur are absorbed at this point. The joint points are thus advantageously relieved.

• Fig. 1 und 2 eine erste Ausführungsform der Erfindung in offener und geschlossener Stellung,
• Fig. 3 und 4 eine zweite Ausführungsform in entsprechender Darstellung, und schließlich
• Fig. 5 und 6 eine dritte Ausführungsform in entsprechender Darstellung.

Further advantages of the invention emerge from the drawings, which illustrate various exemplary embodiments of the invention. Show it

• 1 and 2 a first embodiment of the invention in the open and closed position,
• 3 and 4 a second embodiment in a corresponding representation, and finally
• 5 and 6 a third embodiment in a corresponding representation.

1 shows a symbolically indicated system 10 of the weapon. A first bearing block 12 is fixedly connected to the system 10 and carries one end of a tensioner 16 in a first hinge point 14. The tensioner can be a tensioning lever, as shown in the figure. Of course, the tensioner 16 can be designed as a bottom, top or side tensioner. The tensioner can also contain integrated weapon parts. In this case it must be different than in the shown embodiment not be designed as a separate clamping lever. The tensioner 16 now carries a second articulation point 18 at a certain distance from the first articulation point 14. In the second articulation point 18, one end of a coupling member 20 is connected to the tensioner 16, the other end of which has a third articulation point 22. Here, the coupling member 20 is connected to a rod 24, which in the exemplary embodiment shown is the piston rod.

The rod 24 has a fourth articulation point 26 at some distance from the third articulation point 22. In the fourth articulation point 26, a steering lever 28 acts on the rod 24, the other end of which is again firmly supported on the system 10 in a fifth articulation point 30.

It can be seen that in the exemplary embodiment shown in FIGS. 1 and 2, the first and fifth articulation point coincide, so that both can be supported on the bearing block 12 of the system 10.

The rod 24 is connected as a piston rod to the piston 32 which runs in the cylinder 34. The cylinder 34 is in turn mounted on the cylinder base in a sixth articulation point 36 on a bearing block 38 on the system 10.

It is obvious to a person skilled in the art that the selected linkage with definition of individual points, for example the arrangement of the second link point on the tensioner 16, the distance between the second link point 18 and the first link point 14, and the length of the steering lever 28 (i.e. the distance of the fourth articulation point from the fifth articulation point) arises naturally. The length ratios and other details are therefore not discussed in detail here. Rather, these are based on the needs of the respective weapon and the wishes, selected for example with regard to the stroke size.

In the embodiment according to FIGS. 3 and 4, the arrangement of the tensioner 16, the coupling member 20 and the steering lever 28 is unchanged from the embodiment explained with reference to FIGS. 1 and 2. Here, however, a connecting rod 40 is provided instead of the rod 24 designed as a piston rod. Connecting rod 40 again carries the articulation points 22 and 26 in the manner explained above with reference to the rod 24. However, the sixth articulation point 36 is now placed at the other end of the rod 40, which is connected to the piston 42 in this articulation point 36. The piston 40 runs here in a cylinder 44 which is firmly integrated into the system. The cylinder 44 has a slot 46 on its upper side for the passage of the connecting rod 40 through the cylinder wall. For this reason, the piston 42 is correspondingly extended compared to the embodiment according to FIGS. 1 and 2, as can be seen from the figures. Otherwise, the embodiment according to FIGS. 3 and 4 corresponds to that according to FIGS. 1 and 2.

5 and 6 show an embodiment which largely corresponds to that of FIGS. 1 and 2. Here, however, an additional measure is taken as follows. A tooth segment 48 is additionally provided on the tensioner 16 in the region of its articulation in the first articulation point 14. Likewise, the rod 24 has a toothed segment 50 in the area between the third articulation point 22 and the fourth articulation point 26 in the manner shown in FIG. The tooth segments are designed such that the pitch circle of the tooth segment 48 has the first articulation point 14 as the center point (or the fifth articulation point 30 coinciding therewith) and the second tooth segment 50 has the fourth articulation point 26 as the center point of its pitch circle.

5 that the two toothed segments 48, 50 have no contact with one another when the tensioner is open, that is to say at the beginning of the tensioning stroke. On the other hand, FIG. 6 shows that when the tensioner 16 is closed and folded against the system, the two toothed segments 48, 50 engage and mesh with one another. The toothed segments 48, 50 are arranged such that they begin to mesh with one another towards the end of the clamping stroke and absorb the forces occurring at the six-point joint by supporting the toothed segments so that the joint points are relieved.

Claims (3)

1. A tensioning device for a compressed air weapon with pre-compressed air, wherein a tensioner which is mounted so that it can be pivoted at a fixed pivot point on the weapon system acts on the pressure piston via an articulated pantograph system, the leverage ratio of which increases with increasing compression force, and wherein in addition a rod connected to the piston has a pivot point at which one end of a drop arm is linked to the rod, with the other end of the drop arm being secured to a pivot point fixed to the weapon, and wherein the rod can be connected to the appropriate piston via a further pivot point, characterised in that the drop arm has six pivot points and, in addition to the first fixed pivot point (14) for linking the tensioner (16), has

- a second pivot point (18) remote from the linkage of the tensioner (16), and carried by the latter, for coupling one end of a coupling member (20)

- the other end of which is connected at a third pivot point (22) to the end of the rod (24, 40) projecting from the piston,

- which rod itself has a fourth pivot point (26) between its end which carries the third pivot point (22) and its connection to the appropriate piston (32, 42),

- at which fourth pivot point (26) one end of the drop arm (28) is linked to the rod (24, 40), the other end of which rod is secured at a fifth pivot point fixed to the arm,

- wherein a sixth pivot point (36) is provided at the connection of the rod (40) to the appropriate piston (42) for a cylinder (34, 44) which is rigidly disposed in the system or at the base of the cylinder for a cylinder (34) which is disposed in the system so that it can pivot.

2. A device according to Claim 1, characterised in that the first pivot point (14) and the fifth pivot point (30) coincide.

3. A device according to any one of Claims 1 or 2, characterised in that a first toothed segment (48) is provided on the tensioner (16), secured in the region of its linkage at the first pivot point (14), where the reference circle of this toothed segment has the first pivot point (14) as its centre, and a second toothed segment (50) is provided on the rod (24), which second toothed segment has the fourth pivot point (26) as the centre of its reference circle, wherein both toothed segments (48, 50) start to mesh with each other against the end of the tension stroke.

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