Folding live traps with diaphragm doors, purpose, device, principle of operation, manufacturing, installation and configuration.

Folding live traps with diaphragm doors are a cylindrical cage made of twisted wire mesh. A wire spacer is inserted in the middle of the cylinder, and rims with doors that are “sewn” with a thin cable are inserted into the ends of the cylinder (diagram b). The diaphragm door is mounted on a wire rim with rings for hinging pendants and a spring-loaded shoulder forming a door. 

Folding live traps with diaphragm doors, purpose, device, principle of operation, manufacturing, installation and configuration.

For a muskrat live trap, 190 cm of spring wire 2 mm thick are required on the rim and 136 cm on the pendants. On the piece of wire for the hoop, rings 0.4 cm in diameter are wound at a distance of 5 cm. To make the rings at the same distance, make a template of 4 mm steel rod. The bracket is bent so that the centers of its shoulders are at a distance of 5 cm. The bracket is clamped in a vice, with the shoulders outward 2 cm. The first two ringlets are twisted on them 20 cm from the end of a long piece of wire.

Folding live traps with diaphragm doors, purpose, device, principle of operation, manufacturing, installation and configuration.

Then three more turns are added to the first ring, thus forming a cylindrical spring. The free shoulder is shortened to 11.5 cm and a running ring with a diameter of 4 mm is bent at the end. This shoulder springs bend from the plane of the rim by 45 degrees. It works as the first suspension and spring, which drives all the others, providing the action of the diaphragm door.

For the other suspensions, the rings on the rim are twisted, putting the braces on the left shoulder, and wrap another ring on the right, it is rearranged on the left shoulder. And they do so by twisting all 11 rings. The wound part of the wire segment is bent inward with ringlets into a rim with a diameter of 19 cm. The coils of the spring and the eleventh ring are put on the braces of the bracket and thereby fix the size of the rim, and the free end of the wire is curled around it around the entire perimeter (scheme a).

11 pieces of 12 cm long are cut into pendants of a diaphragm door of 2 mm wire. On each segment (2 mm from the end), rings with a diameter of 0.4 cm are bent, and deflections are made on the segment (diagram b). The spring arm also makes the same shape. Then, a suspension is hung on the rim adjacent to the spring on the rim and the ring is squeezed. The free end of the suspension is brought into the running ring of the spring and also squeezed.

So sequentially on each adjacent ring of the rim (without a pass) hang another suspension, and the free end lead into the running ring of the previous suspension. The result is a single block of suspensions interacting with each other and with the spring arm. The figure above shows the assembled diaphragm door in a deflated form (a) and in a diluted form with the spring shoulder pressed to the rim (a1). In the manufacture of folding nut traps for nutria are made with dimensions as a muskrat live trap, simply increasing them by 1.5 times.

Folding live-trap alarm with diaphragm doors.

An alarming device for a double-acting muskrat live trap consists of two drive cables (g), a gatehouse – a rod with a ring at the upper end (e) and guards – brackets with two rings at the ends (e). The guardhouse and guardhouse rings are freely suspended on the internodes of the mesh inside the middle of the cage near the spacer hoop. Drive cables with eyelets are suspended from the door rim opposite the middle of the spring shoulder.

Folding live traps with diaphragm doors, purpose, device, principle of operation, manufacturing, installation and configuration.

In adjacent to the spring, wound clockwise, in the ring of the rim located to the left of it, pull the cable and tie its end with a knot so that it does not slip through the ring. The cable is inside the cell. When assembling the live trap, make sure that the guard is in the lower part of the cage, and the rims with doors are inserted exactly where the cables are fastened (diagram c). In this position, both doors are “sewn” to the ends of the cell with a nylon cord or steel cable.

Alert folding bellows with diaphragm doors.

To guard the live trap, the door spring shoulder is pressed against the rim, while all the suspensions are moved apart and the diaphragm opens. The cable is pulled out of the middle of the cage, it grabs the middle of the spring arm, throws its end through the door rim to the top of the cage, pulls it and enters the cage behind the spacer rim, where the looper is put on the gatehouse. The free end of the gatehouse is lowered down and the free end of the guard rests against it..

They also do the second door. The diaphragm is bred, the spring shoulder is encircled by a cable, which is pulled outside the cage and inserted inside it on the other side of the spacer rim, and the loop is put on the gatehouse, which is already fixed with a guard with two cables attached. In this form, folding live traps are installed on the animal trail or with bait at the muskrat hut.

Operation of a folding live trap with diaphragm doors after installation.

When visiting a live trap, the animal steps on the alert, lowers it down (schemes c, e, I). It releases the end of the gatehouse (d, II), which turns the cells upside down, and the loop of the cable (g, III) jumps off it, releasing the springs of the doors covering both diaphragms (b, IV). The reliability of the closed diaphragm door is designed to ensure that the caught animal, trying to get out of the live trap, does not break into the center of the diaphragm door, where the wire pendants converge denser, but around the circumference of the rim, where there is more clearance.

However, this does not exclude the case when, after falling into a folding live trap, the animal can open the door. Therefore, it is worthwhile to adapt the locking device to the door with the diaphragm from the suspensions; it may turn out to be a cranked deflection at the running ring of the suspension adjacent to the shoulder of the spring. During this deflection, the running ring of the spring should jump and thereby fix the diaphragm in the closed position.

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

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