SU1248618A2 - Snap hook for mountaineers - Google Patents

Description

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The invention relates to mountaineering equipment, in particular to carabiners, which can also be used by mountain tourists, fitters-spidermen, during evacuation during fires, geology, when working in high mountainous areas, and is an improvement of the device according to the author. St. No. 96171 4o

The purpose of the invention is to increase the reliability of work under load.

FIG. 1 shows the proposed carbine, longitudinal cut of FIGS. 2-4, section A-A in FIG. 1.

The carabiner comprises a body 1. with an axial channel 2 of variable diameter and perpendicular to it a groove 3, a cable 4, a screw 5 with an eye 6 for fastening the rope 4 at one end and the collar 8 at the other, made, for example, in the form of elliptical chi -, while the screw 5 is installed in the axial channel 2 of the housing 1. The cable 4 with the ends 9 is fixed in the housing with the formation of a loop 10, which passes through the hole of the hook 11 and, placed in the groove 3 of the housing, covering the shoulder 8, the shoulder flange shape can be different ,, other than a circular cylinder mounted along the axis of the vi. nta, for example in the form of an elliptical shchindra, in the form of a cylinder with one or more faces (figo 2 and 3), etc.

The carabiner is used in a perceptive manner.

Before lowering the loop 10 of the cable 4 is passed through the hole of the hook 11 pre-clogged, for example, a rocky crack, and the input tv groove 3 of the housing 1 s Then fix the loop by rotating the screw 5 clockwise

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in case 1, flange 8. Rope 7 is dropped down and, along it, climbers descend or work is carried out by geologists, assemblers. In order to remotely open the carabiner, the rope is rotated counterclockwise to lift the screw 5 into a lower position relative to the body 1 and release the loop 10 clamped by the shoulder 8

10 of the cable 4. Due to this rope, 7 together with the carabiner falls down.

Compared with the known device, the proposed design improves the reliability of the karabi15 operation by eliminating the possibility of screwing under the load by making the shoulder in a form different from the cylinder mounted along the axis of the screw.

20 moment of forces that: fixes the collar from turning and the magnitude of which is at least an order of magnitude greater than the moment ctm of friction of the collar of the cable in the known device So, for example, with b.sevoy force acting on the rope and carabiner in 100 kg and diameter, collar 10 mm moment of friction force of the cable on the surface of the cylindrical collar will be 0.05 kgm. AT

At the same time, if the shoulder is installed with an eccentricity of 5 mm on the carabiner screw, then, along with the moment of friction of the cable against the surface of the collar, to rotate the screw it is necessary to pull the cable by the amount of eccentricity. For given parameters, the torque required for turning the screw will not be. less than 0.55 kgm.

Thus, in the proposed design as compared with the known one, the screw is secured in the housing more reliably, as a result of which the reliability of the carbine is increased.

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Editor N.Shishkin

Compiled by N. Volodin

Tehred G.Gerber Proofreader S.Cherni

Order 4156/5 Circulation 406 Subscription

VNIIPI USSR State Committee

for inventions & otkryggy 113035, Moscow, Zh-35, Raushsk nab., d. 4/5

Production and printing company, Uzhgorod, st. Project, 4

FIG.

Claims (1)

Carabiner for climbers by author. St. No. 961714, characterized in that, in order to increase the reliability of operation under load, the screw flange has a cam shape in cross section. „„ SU “4248618 A 2