EP1405611B1 - Device for assisting in the birth of livestock - Google Patents

Abstract

The livestock birth aid lever rod (1) has one end connected to an apparatus supported on the mother animal and with two casings (2,3) which can be fixed in place. The lever rod supports a pair of clamping rings and has multiple parallel notches spaced perpendicular to the axis of the lever. Each notch has a flat face facing the front lever and an angled face facing the rear end.

Description

The invention relates to a device for livestock obstetrics with a circular cross-section rod, wherein the rod in the region of a front end of receiving a supportable on the mother animal neck support and behind two alternately displaceable and lockable sleeve-shaped parts, wherein the rod, for receiving in the sleeve-shaped parts held, enforced by the rod clamping rings, is formed profiled, wherein the rod has a plurality of mutually parallel and arranged perpendicular to the longitudinal axis of the rod circumferential recesses, wherein the respective recess facing the front rod end, a steep edge and, facing away from the front rod end , has a flat edge.

A livestock obstetric device using a rod is described in EP 0608 790 B1. In this device, the rod, which receives in the region of its front end which can be supported on the mother animal neck support, formed on the outside smooth. In one of the two arranged on the rod, alternately displaceable and lockable sleeve-shaped parts a clamping lever is pivotally mounted. This takes at a distance from its pivot axis, an intermediate member pivotally. The intermediate member is also pivotally mounted in the other sleeve-shaped part. There are provided two holding devices that allow tension in the pulling direction connectable with the holding devices leg loops for the young. At least one of the holding devices is located on a sleeve-shaped part other than the clamping lever.

During the birthing process, unless the tensioning lever is actuated, both sleeve-shaped parts are determined by means of the clamping rings associated therewith, while during the further tensioning process only one of the sleeve-shaped parts is fixed and the other sleeve-shaped part is displaced.

In order to improve the clamping force of the clamping rings with respect to the rod, it has already been proposed to form the rod with a profiled surface by providing the rod with a rectangular thread over the working region of the sleeve-shaped parts or the locking rings passing through the rod. A disadvantage of such a design that the clamping force can not be increased appreciably and sets a fairly high wear between the rod and the clamping rings. This is due to the fact that the clamping rings in their relation to the unloaded starting position inclined clamping position, the rod only touch each other substantially at one point and there consequently the pressure load is very high.

A device for livestock obstetrics of the type mentioned is known from US 3,863,642. There is a smooth rod use, are provided in the annular projections, which have a rectangular cross-section. Due to this configuration, the steep flank perpendicular to the longitudinal axis of the rod and the flat flank parallel to the longitudinal axis of the rod extends at the respective puncture of the rod. Due to the U-shaped configuration of the respective recess this is thus by two spaced apart, arranged perpendicular to the longitudinal axis of the rod steep edges and one of the two steep flanks connecting flat edge, which runs parallel to the longitudinal axis of the rod formed. Between the two adjacent steep flanks of adjacent recesses a rod portion is formed, which runs parallel to the longitudinal axis of the rod. In the area of such bar sections of the punctures, the sleeve-shaped parts are guided in the bar.

In US 3,113,571 a device for livestock obstetrics is described in which the rod is formed as a rectangular tube and which serves to the slidable receiving two sleeve-shaped parts. The rod is provided in the region of one of its outer surfaces with teeth which serve to receive pawls which are pivotally mounted in the sleeve-shaped parts against the action of a spring. The sleeve-shaped parts are guided displaceably in the rectangular rod.

EP-A-0 108 866 discloses a livestock obstetric device in which the rod on the two opposite sides is provided with guide slots extending along the length of the rod, in which the parts displaceable on the rod are inserted and guided , The rod thus passes through not sleeve-shaped parts. With the slidably mounted in the rod parts pawls are connected, which can be brought into operative connection with rack sections of the rod. The rod has for this purpose on each side of the rod, which is provided with the guide groove, the said rack section.

The object of the present invention is to further develop the rod in a livestock obstetric device such that the surface loading of the clamping ring during use of the device is relatively low and, moreover, the interaction of rod and clamping ring takes place essentially without wear. In addition, an optimal, in particular low-friction guidance between the sleeve-shaped parts and the rod should be ensured.

The object is achieved in a device for cattle obstetrics of the type mentioned in that the respective steep edge with the perpendicular to the longitudinal axis of the rod an angle of 5 ° to 15 ° and the respective flat edge with the longitudinal axis of the rod an angle of 10 ° to 20 °, and, based on adjacent punctures, the flat flank of the one puncture and the steep flank of the other puncture are interconnected by means of a parallel to the longitudinal axis of the rod rod portion.

The invention is detached from the basic idea of a rod with a smooth outer surface, or a rod which is provided with an external thread with a rectangular cross-section. In the latter variant, the profiling is not arranged in the direction of the transverse axis of the rod.

In the clamping position, the respective clamping ring is inclined to a vertical, relative to the longitudinal axis of the rod. For an externally smooth rod, this means that the respective clamping ring contacts the rod with its inner edge. Since this inner edge treads a different curve than that of the rod, the clamping ring contacts the rod only along a relatively short distance. The clamping action between the clamping ring and rod is based on an adverse notch effect with the consequence that only relatively low tensile forces can be transmitted from the sleeve-shaped part to the rod, with fairly high wear of the clamping ring and rod.

In the rod provided with the rectangular thread, however, contacted the inclined side surface of the clamping ring, the facing thread edge, so that also the undesirable notch effect is recorded along a short line contact. In this embodiment, however, since the force is transmitted between the respective clamping ring and the rod by means of positive locking, this is higher than when using a smooth rod.

The invention dissolves from the known from the prior art operating principles by a respective contact surface between the clamping ring and the. By the respective arrangement of a puncture perpendicular to the longitudinal axis of the rod and forming the front rod end facing steep flank of the puncture Rod is produced in the clamped position. Since the clamping ring is subjected to less stress due to the surface load, a higher force can be transmitted to the rod with this, without the cooperating components are exposed to significant wear.

A further advantage is that the puncture, facing away from the front rod end, has a flat flank. This ensures that when moving the respective sleeve-shaped part, after loosening the clamping connection between the clamping ring and rod, the clamping ring gently into the can slip over adjacent puncture. In this case, the clamping ring contacts the flat flank on the inside.

A further advantage is that, based on adjacent recesses, the flat flank of the one recess and the steep flank of the other recess are connected to each other by means of a parallel to the longitudinal axis of the rod rod portion. About such parallel rod sections adjacent recesses can be done in a particularly simple manner, the leadership of the sleeve-shaped parts on the rod, thus both when moving the sleeve-shaped parts away from the neck support, while tightening the leg loops, as well as after loosening the clamping rings Relax the leg loops by moving the sleeve-shaped parts towards the neck support

Suitably, the hole in the respective clamping ring is matched to the outer diameter of the rod, such that the outer diameter of the rod is slightly smaller than the opening diameter of the respective clamping ring.

The respective clamping ring is released, for example, when transferring the clamping lever in its end position by acting on the clamping ring and transferred from the inclined position to its initial position perpendicular to the longitudinal axis of the rod. This movement can also be effected by a separate actuator which acts on the clamping ring.

Further features of the invention are illustrated in the figures, the description of the figures and in the dependent claims, wherein it is noted that all individual features and all combinations of individual features are essential to the invention.

Fig. 1

Eine Seitenansicht eines Gerätes zur Viehgeburtshilfe einschließlich Stange, für den für die Erfindung relevanten Bereich des Gerätes,

Fig. 2

ein Längsmittelschnitt durch den zur Figur 1 veranschaulichten, mit der Stange zusammenwirkenden Bereich des Gerätes zur Viehgeburtshilfe,

Fig. 3

einen Ausschnitt der erfindungsgemäßen Stange,

Fig. 4

eine Ansicht einer Stange gemäß dem Stand der Technik.

In FIGS. 1-3, the invention is illustrated by way of an embodiment, for example, and in FIG. 4 the prior art is documented. It shows:

Fig. 1

A side view of a device for livestock obstetrics including rod, for the relevant area of the invention for the invention,

Fig. 2

a longitudinal mid-section through the illustrated with FIG 1, cooperating with the rod portion of the device for livestock obstetrics,

Fig. 3

a section of the rod according to the invention,

Fig. 4

a view of a rod according to the prior art.

The device for livestock obstetrics shown for the areas essential to the invention comprises a rod 1. Not shown is a supportable against the body of the mother animal neck support into which the rod with its, based on the orientation of Figure 1 left end can be inserted. The mother's animal turned away (right) end of the rod is also not clarified and takes a handle on.

Between the lug support and connected to the other end of the rod handle two alternately displaceable and lockable sleeve-shaped parts 2 and 3 are arranged on the rod 1, wherein the mother animal facing sleeve-shaped part 2 with two diametrically arranged holding devices 4, of which only one is visible in the figure, is provided, which are formed as open on the mother's side facing away hooks. In addition, the sleeve-shaped part 3 may be provided with a correspondingly formed holding device. The two ends of leg loops are hung in the holding devices, according to the requirements of the birth process, whose other ends are looped around the respective leg of the young animal.

With the sleeve-shaped part 3, a clamping lever 7 is pivotally connected. Whose pivot axis is designated by the reference numeral 8. An intermediate member 11 has a first intermediate member part 11a, which is mounted at a short distance from the pivot axis 8 about the pivot axis 13 in the tension lever 7 is, further, a second intermediate member part 11 b, which is pivotally mounted about a pivot axis 12 in the sleeve-shaped part 2. Thus, when pivoting the clamping lever 7, the sleeve-shaped parts 2 and 3 can be moved away from one another or towards each other. The shown, the intermediate member 11 associated with individual components are used for presetting a tensile force or limiting the tensile force that may be exercised over the leg loops on the young.

In the device, the release and fixing of the sleeve-shaped parts 2 and 3 in a known manner by means of clamping rings 32 and 33, which are movably mounted in the sleeve-shaped parts 2 and 3 respectively. The clamping rings are mounted on the intermediate member 11 facing side of the respective sleeve-shaped part 2 and 3 in recesses 34 of the sleeve-shaped parts 2 and 3 and, starting from the position shown in Figure 2, in the direction of the double arrows X limited in the respective recess 34 pivotally mounted. Due to the vote of the respective annular opening 35 with the outer diameter of the rod 1, the clamping rings 32 and 33 clamp the rod in an inclined position, whereby the determination of the sleeve-shaped parts 2 and 3 takes place on the rod 1.

In the figure 2, the position of the clamping rings 32 and 33 is illustrated, in which a displacement of the sleeve-shaped parts 2 and 3 relative to the rod 1 is possible. Detected are the sleeve-shaped parts 2 and 3, when the clamping rings 32 and 33 are positioned adjacent to the inclined stop surfaces 36 of the sleeve-shaped parts 2 and 3. The release of the sleeve-shaped parts by means of a lever 37 which is mounted on a bearing axis 38 on the mother animal side facing away from the sleeve-shaped part 3 in this. In a pivoting movement of the lever 37 (relative to the illustration of Figure 2) in a clockwise direction, this passes against the clamping ring 33 and pivots it in the position shown in FIG. As a result, the dissolved sleeve-shaped part 3 moves in the direction of the sleeve-shaped part 2 and abuts against a plunger 39 mounted in it. This pivots the sleeve-shaped part 2 associated clamping ring 32 in its position shown in Figure 2, whereby the sleeve-shaped part 2 relative to Bar 1 is released and moves due to the pulling forces exerted by the leg loops on the holding means together with the sleeve-shaped part 3 in the direction of the mother animal.

The reference numeral 40 denotes in the sleeve-shaped parts 2 and 3 on the recesses 34 applied to the side springs 40, which bias the clamping rings 32 and 33 in their pivoted locking position. A arranged between the sleeve-shaped part 3 and the lever 37 compression spring 41 biases the lever 37 in the counterclockwise direction. Finally, each sleeve-shaped part 2 or 3 on its side facing the other sleeve-shaped part two recesses, wherein two guide sleeves 42 are inserted into the facing recesses of the sleeve-shaped parts 2 and 3. Within the respective guide sleeve 42, a tension spring, not shown, is arranged, whose ends are connected to the respective sleeve-shaped part 2 or 3 and thus exert a force that pulls the two sleeve-shaped parts 2 and 3 to each other.

The rod 1 is formed as a hollow tube. In FIG. 1, the outer contour of the rod 1 is illustrated with transverse lines in order to make clear that the rod is provided with a plurality of recesses arranged parallel to one another and arranged perpendicular to the longitudinal axis 9 in the rod 1.

These punctures are designated by the reference numeral 45 in FIG. The respective recess 45 has, facing the front rod end, a steep edge 46 and, facing away from the front rod end, a flat edge 47. The respective steep flank 46 closes with the vertical 48 to the longitudinal axis 9 of the rod 1 an angle of 10 ° and the respective flat edge 47 with the longitudinal axis 9 at an angle of 15 °. Preferred angles of the steep flank are between 5 ° and 15 °, the flat flank between 10 ° and 20 °. Based on the respective groove 45, the flat and the steep flank contact each other in a circular line, which is designated by the reference numeral 49.

Relative to adjacent recesses 45, 45, the flat edge 47 of one recess 45 and the steep edge 46 of the other recess 45 are connected to each other by means of a rod portion 50 arranged parallel to the longitudinal axis 9 of the rod 1. The diameter of the rod 1 in the region of the rod portions 50 is slightly smaller than the opening diameter of the sleeve-shaped parts 2 and 3 and the clamping parts 32 and 33, so that the Bar, with the clamping rings in the dissolved position relative to these and the two sleeve-shaped parts 2 and 3 are moved.

In the inclined position, however, are the clamping rings 32 and 33 with their then radially displaced end faces 51 on the steep edge 46 of the respective groove 45 at.

• der jeweilige Einstich 45 weist eine Länge von 3 bis 7 mm, insbesondere 5 mm auf,
• der Stangenabschnitt 50 weist eine Länge von 0,4 bis 0,8, insbesondere 0,6 mm auf,
• die Stange 1 weist einen Bereich von 700 bis 1000 mm, vorzugsweise 800 bis 900 mm, insbesondere 850 mm auf, der mit den Einstichen 45 versehen ist.
• Der Außendurchmesser der Stange 1 beträgt 25 bis 35 mm, vorzugsweise 28 bis 32 mm, insbesondere 30 mm.

The geometric dimensions of the rod 1 are advantageously as follows:

• the respective recess 45 has a length of 3 to 7 mm, in particular 5 mm,
• the rod portion 50 has a length of 0.4 to 0.8, in particular 0.6 mm,
• the rod 1 has a range of 700 to 1000 mm, preferably 800 to 900 mm, in particular 850 mm, which is provided with the recesses 45.
• The outer diameter of the rod 1 is 25 to 35 mm, preferably 28 to 32 mm, in particular 30 mm.

FIG. 4 illustrates a prior art bar which may also be used in the apparatus described in principle with reference to FIGS. 1 and 2. The outer diameter of this rod 1 corresponds to the outer diameter of the rod 1 in the region of the sections 50. However, the rod 1 is provided with a thread profile, the cross section of the thread 52 is rectangular.

Claims (8)

1. Device for assisting in the birth of livestock with a rod (1), which has a circular cross-section, in which in the area of a front end the rod (1) serves to accommodate an anatomical support that can be supported on the mother animal and behind it two sleeve shaped parts (2, 3) that can be moved and fixed alternatingly, in which the rod (1) is made profiled to accommodate clamping rings (32, 33) held in the sleeve shaped parts (2, 3) and penetrated by the rod (1), in which the rod (1) has a plurality of circular recesses (45) arranged parallel to each other and arranged perpendicular to the longitudinal axis (9) of the rod (1), in which each respective recess (45) has a steep flank (46) facing the front rod end and a flat flank (47) facing away from the front rod end, characterised in that each respective steep flank (46) encloses an angle of 5° to 15° with the perpendicular (48) to the longitudinal axis (9) of the rod (1) and each respective flat flank (47) encloses an angle of 10° to 20° with the longitudinal axis (9) of the rod (1) and in relation to adjacent recesses (45, 45), the flat flank (47) of one recess (45) and the steep flank (46) of the other recess (45) are connected with each other by means of a rod section (50) arranged parallel to the longitudinal axis (9) of the rod (1).
2. Device according to claim 1, characterised in that each respective steep flank (46) encloses an angle of 10° in particular with the perpendicular (48) to the longitudinal axis (9) of the rod (1) and each respective flat flank (47) encloses an angle of 15° with the longitudinal axis (9) of the rod (1).
3. Device according to claim 1 or 2, characterised in that in relation to each respective recess (45), the steep flank (46) and the flat flank (47) contact each other.
4. Device according to one of claims 1 to 3, characterised in that each recess (45) has a length of 3 to 7 mm, particularly 5 mm.
5. Device according to one of claims 1 to 4, characterised in that the rod section (50) has a length of 0.4 to 0.8 mm, particularly 0.6 mm.
6. Device according to one of claims 1 to 5, characterised in that it has an area of 700 to 1000 mm, preferably 800 to 900 mm, particularly 850 mm, which is provided with recesses (45).
7. Device according to one of claims 1 to 6, characterised in that its outer diameter is slightly smaller than the opening diameter of the respective clamping ring (32, 33).
8. Device according to one of claims 1 to 7, characterised in that the outer diameter of the rod (1) amounts to 25 to 35 mm, preferably 28 to 32 mm, particularly 30 mm.

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