Portable steel automatic live traps for beaver, purpose, device, operating principle, manufacturing, installation and configuration.

Portable folding portable live traps are the most promising in the unauthorized hunting of fur animals. Their use allows you to catch animals more humane, without causing them injuries and torment. You can select intact animals and leave the most valuable producers on the tribe. For example, in the beaver fishery, traps first of all fall and die in the beaver traps and young suckling females.. 

The use of live traps allows these beavers to be released and left to the tribe of the darkest, and for slaughter to select full-haired adult males, idle females and graying old beavers.

Portable steel automatic live traps for beaver, purpose, device, operating principle, manufacturing, installation and configuration.

The first beaver live traps were made by the hunters themselves. These were cylindrical cells 1 meter long and up to 0.4 meter in diameter, made up of steel rods interwoven across the circumference in several rows with wire. One base of this cylinder was braided with a net, an oval door was hung in the other, rising only inside the cage and held by a hinge, connected by a rod with a guard swinging inside the cage in the form of a shield suspended from the net.

Portable steel automatic live traps for beaver, purpose, device, operating principle, manufacturing, installation and configuration.

These live traps were very bulky, heavy and uncomfortable. To increase the productivity of hunters engaged in catching beavers, a folding portable live trap with an openwork door (JAD-3) was designed. Its cage is made of metal mesh in the form of a cylinder 75 cm long and 33 cm in diameter. The end sides of this cylinder were framed with clips of 1.5 mm iron profiled strips, and the back wall and openwork door were mounted on rims flanged from such same strip of iron and fitted to the clips.

The arches of the openwork door were suspended on the axles from a wire screwed on one rim, and its other end was braided with a net. At the openwork door, one of the arches was set in motion by the force of a multi-turn coil spring attached tightly to the hoop. The alarm device consisted of a core gatehouse suspended on a grid against a spring-loaded arch.

With this hanging gatehouse, a spring-loaded arch rose up, and all interacting arches moved apart to the inner wall of the cylinder. The rod with a cocked spring-loaded arch rested on a ring suspended from the net, which was connected by a cable to a swinging shield – a guard, also suspended from the net on the ceiling of the cage. In handicraft production, it is quite difficult to make such live-traps.

Simplified steel automatic live traps for beaver, purpose, device, operating principle, manufacturing, installation and configuration.

In order to simplify the production and reduce the cost of self-locking, a more convenient folding and reliable beaver live trap (JAD-4) is recommended. The cylindrical cell is made of coarse mesh (cells with sides 5.5 cm and diagonals 7.5×7.5 cm) braided from 2 mm wire. A rectangle with longitudinal sides of 75–80 cm or from 10–11 cells and a transverse 105 cm from 14 cells is cut from such a grid.

The last row of fourteenth cells is interwoven with cells of the first row. In this way, a cylinder is obtained from a square grid. A hoop 32 cm in diameter, twisted from 3-4 mm thick wire, is inserted into the middle of the cylinder. The same hoop is made on the rear wall of the cylinder and braided with a net. Connect it to the cylindrical cell of the trap using a thin cable with a thickness of 1.0-1.5 mm, which “sew” the mesh circle along the edge and through the edge of each cell of the mesh of the cell (schemes a, c).

In the artisanal production of these live-traps, 3 meters of spring wire 3 mm thick are taken for the manufacture of an openwork door. Having retreated 1 m from one end, 16 rings with a diameter of 7 mm are wound every 64 mm in order to suspend 8 arches of an openwork door on them (scheme b). So that the rings are at the same distance from each other, they make a template in the form of a bracket, bent from 6 mm steel bar, so that the distance between the centers of the bent shoulders is equal to 64 mm.

This bracket is clamped in a vice upwards with the ends of the shoulders and 16 rings are sequentially wound on them. First make the first pair. Then the ring on the right is rearranged on the left shoulder of the bracket and the third ring is wound, it is also put on the left shoulder of the bracket. Then the fourth ring is wound and so on. 16. The entire part of the wire wound with rings is bent into the rim, and the 1st and 16th rings are put on the brackets shoulders, fixing the size of the wire hoop and reinforcing it by winding it around the entire circumference of a free end of wire without rings and then the second longer.

At least 35 cm is measured at this end and opposite the near hinge ring of the rim, it is bent at a right angle, passing through the ring, and a corner is bent from it at 60 degrees with sides of 15.5 cm and a bend radius of 1 cm at the apex (schemes a, b) On the free side of the corner, a hinge ring is bent, which is worn through two rings on the third on the rim. So it turns out the first springy arm, actuating the remaining arms and closing the openwork door.

For the complete installation of the openwork door, the remaining 7 arches with sides of 15.5 cm each are made of 3 mm spring wire. They are bent at an angle of 60 degrees, and with hinged rings at the ends. The first bow is suspended with one shoulder, stepping over the shoulder of the spring-loaded bow, and the second – after two to the third ring on the rim. Then another arm is raised over this shoulder, suspended from a hoop ring. The second arm of the arm is suspended after two on the third ring on the rim.

The remaining 5 arms are suspended in this order. The last arm of the eighth arm is brought down from under the shoulder of the spring arm. Thus, a closed system of 8 arches successively supporting one another is obtained. This system makes openwork door to be closed under the action of the force of one spring arc. A hoop with an openwork door is inserted into the end of the cylinder of the trap and is “sewn” over the edge of the hoop with mesh cells with a thin cable (nylon cord) (patterns a, b).

In factory production with a powerful press economy, the rims for the openwork door and the back wall of the live trap can be stamped from sheet metal 1 mm thick. At the same time, flanging them, punch 16 holes in the rim for hanging the arches of an openwork door. To reduce the waste of sheet iron from the cut circle, the second and then the third rims can be cut to smaller size live traps.

For stamped rims, all 8 arms make the same size and one of them is supported by the torsion-spring springs. For this, a semicircle with a radius of 16 cm is bent from 0.5 meters of a spring wire 3 mm thick. One of its ends is strengthened in the inner part of the rim, and the other is bent at a right angle and with this shoulder the corresponding arm of the bow is supported.

The manufacture of alarm devices for livestock trap handicraft and factory production.

An alarming device for livestock trap of handicraft and factory manufacture is easier to do the following design. From a piece of spring 3 mm wire 40 cm long, departing from one end by 3 cm, a ring 2 cm in diameter is bent, for which it is suspended from the inside to the mesh ceiling of a live trap cage 15 cm in front of the rear wall of the cage and so that the short end of the gatehouse protrudes onto 1 cm outside the cage (Scheme B, III).

A guard is bent from the same wire in the form of an arc with an angle of 50 degrees and sides of 35 cm. At the free ends of this arc, they are also bent along a 3 cm diameter ring that pivotally fastens it to the grid at the bottom of the cylinder (schemes a, b, I) . Then take a steel cable with a thickness of 1-1.5 mm. At one end, make a loop, put it on the end of the gatehouse protruding above the cage. And the free end of the cable is pulled outside along the cage to a distance to the top of the raised spring-loaded arch of the openwork door.

In this position of the bow, the cable is pulled through the mesh cell and its end is tied to the bow (pattern B, IV, V). When catching minks, martens, muskrats and other animals, a live trap with an openwork door is made smaller and with a finer mesh of wire 2–1.5 mm thick. The rims of the openwork door and the rear wall and the bow are made of spring wire 1.5 mm thick.

Sizes of live traps for catching mink and muskrat.

The cell body length of the mink live trap should be up to 60 cm. The diameter of the openwork door is 16.2 cm. The distance between the centers of the hanging rings is 3.2 cm. The diameter of the rings on the rim and arches is 3 mm. The length of the sides of the arms from the center of the hanging ring to the center of the bend angle of the top of the arm is 7.5 cm. The radius of the bend of the top of the arm is 0.7 cm. The bend angle is 60 degrees. For minks and muskrats, live traps can be made walk-through with two openwork doors that interact simultaneously with one gatehouse and guard.

When assembling live traps with openwork doors, a spacer rim is raised in the middle of the cage. Then make sure that the spring-loaded handle with the cable tied to it is in the upper position opposite the end of the gatehouse that protrudes above the cage. The rim of the door and the rear wall is “sewn” over the edge with a thin cable to the mesh cells of the cylinder end.

Alertness and principle of action of a steel automatic live trap on a beaver.

To alert the live trap, the spring-loaded arch is raised upward inside the cell. Why the remaining 7 arms are pressed against the inside of the cylinder. Then the rope is passed through the mesh cell over the handle, pulled and looped onto the end of the gatehouse protruding from the trap, while holding it upright and hooking its lower end to the top of the guard’s arc (pattern B, III, I).

The live-trap is frustrated as soon as the beaver enters it and steps on the guard (I) or heads down the gatehouse (II), which deviates to the back wall. Then the loop of the cable will jump off its end (III), the cable will be released (IV) and the openwork door will close (V). At the same time, the beaver’s tail will remain half outside, but as soon as the beast pulls the tail into the trap and turns its head to the door, it will close to failure. The stronger the animal pushes into it, the stronger it closes.

Based on materials from the book Hunting Samolov and Unauthorized Fishing. Directory.
Gerasimov Yu. A.

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