SU1674879A1 - Device for climbing along beam - Google Patents

Abstract

The invention relates to the field of safety devices and makes it possible to increase reliability and convenience of operation. The device has means for attaching to the leg placed on the support pad, a pair of stop plates forming a gap, two stops are made on one of the plates, one stop on the counter plate is offset vertically, and the stop plates are attached to the support pad in its toe section, 3 hp f-ly, 7 ill.

Description

This invention relates to safety devices.

The aim of the invention is to increase the reliability and convenience of operation. FIG. 1 shows a device, side view; in fig. 2 - the same, top view; in fig. 3 is a view A of FIG. one; in fig. 4 shows a section BB in FIG. 3; in fig. 5-device when moving along the beam; in fig. 6 - engagement of the device for the beam; in fig. 7 is a diagram of the formation of torques at the engagement points.

The beam climbing device comprises a support platform 1, a lower 2 and an upper 3 thrust plates, two lower stops 4 and 5 and a third upper stop 6, lock nuts 7, shoulder 8, stiffening ribs 9, pin 10, flanges 11, holes 12 for fastening belts. The support platform 1 is made in the form of a foot, in the toe part of which there is a U-shaped groove facing the inner side of the paired supporting platform 1. On parallel displacements relative to each other along the vertical of the groove, the lower 2 and upper 3 supporting plates are fixed, with the lower plate 2 is located in the plane of the supporting platform 1. The working planes of the abutment plates 2 and 3 are additionally equipped with conical lugs 4-6. The stops 4 and 5 are fixed rigidly, horizontally and at a distance from each other on the working plane of the lower thrust plate 2. The third upper adjustable stop 6 is fixed on the working plane of the upper thrust plate 3.

The stop platform of the third stop 6 is the apex of an isosceles triangle whose vertices at the base are the stop platforms of the two lower stops 4 and 5. The stiffening ribs 9 are located radially from the right side of the supporting platform to its toe part. The stiffening rib 9 extends along the closed side of the groove, connects the lateral sides of the thrust plates 2 and 3 and passes into the plane of the supporting platform 1. In the heel part of the supporting platform 1 there is a clamp 10, made in the form of an arcuate plate, enveloping the supporting surface fixed on the sides of the support platform 1. made in the form of rims 11. The ribs 11 have openings 12 for fastening the peCO

with

ON V4

four

00

VI

H

to the foot of the worker. Each stop 4 and 5 on the lower stop plate 2 is made in the form of a stud with a tapered end, provided with a length limiter in the form of a shoulder 8 nq to the perimeter of the stud connected to the stud in one piece. The stops 4-6 are fixed on the stop plates 2 and 3 by the lock nuts 7.

Points a, b. c (fig. 4) correspond respectively to the resistant pads of the upper 6 and lower 4, 5 stops. Forces acting on a beam about the points of engagement a, b, from stops 6 4, 5, respectively Pa. Pi. Рз.

FIG. Figures 5 and 6 depict the beam 13 (in the first case, rectangular, in the second case, an I-beam) and the position of the stops as the device advances along the beam (Fig. 5) and when engaged with the beam (Fig. 6).

The foot pad 1 in the shape of a foot with a U-shaped groove in the toe part is cut (for example, by a stamp) from a whole sheet of metal with a thickness of at least 2 mm. Moreover, the parallel sides of the groove are displaced relative to each other along the vertical of the groove so that the lower side of the groove lies in the plane of the supporting platform 1. The length of the supporting platform 1 from the heel to the U-shaped groove is determined by the size of the worker's shoe and is chosen in three sizes. In order to impart additional rigidity, stiffening ribs 9 are welded to the supporting platform 1, which are positioned radially from the heel to the nose part, for example, three stiffening ribs.

In order to prevent the worker's feet from sliding in the right part of the support platform 1, a wand 10 is welded to its sides, having the form of an arcuate plate. The support platform 1 is provided with flanges 11 on each side, in which there are holes 12 for pulling the straps for fastening the feet of the worker. Parallel plates 2, 3 are welded onto parallel sides of the U-shaped groove of the supporting platform 1. On the working surface of the lower supporting plate 2 are fixed, for example, by means of a threaded joint, two stops 4 and 5, located horizontally from one another. On the working surface of the upper thrust plate 3, a third length-adjustable stop 6 is fixed. The stops 4-6 are fastened with lock nuts to prevent from spontaneous unfolding. The stops 4-6 are made, for example, in the form of studs with a tapered end and thread for fastening. In addition, the stops 4 and 5 to reduce the specific pressure on the thrust plate 2 are provided with a shoulder 8 along the entire perimeter, which is located from

the tips of the cone are at a distance equal to the working length of this stop. For additional fixation of the abutment plates 2 and 3, the latter are connected by a stiffening rib 9,

passing along the closed side of the U-shaped groove and passing into the plane of the supporting platform 1.

The device works as follows.

The device is fastened on the legs of the worker with belts so that the U-shaped grooves in the toe part of the support platforms 1 are directed towards each other. Then U-shaped grooves wrap shelves

beams. In this case, the device is engaged by stops for the profile of the flanges of the beam. At points of engagement, moments of oppositely directed forces are created: force P is directed in the direction opposite to forces PI and

РЗ, where Ra is the third support reaction of the stop 6 (point a); PI, P3 - support reactions of the first 4 and second 5 stops (points b and c, respectively). Since when the points a, b, c are joined, an isosceles triangle is formed,

then, the forces Pi and РЗ create at points b and с with equal in magnitude and equally directed moments Mi and Мз respectively with respect to point a (for PI, arm Ii2 for РЗ — arm 123; Fig. 7). Moreover, the sum of moments MI, Мз

is equal and opposite to the moment M2 created at point a by force P2 relative to point D (the point D is the intersection point of the median of an isosceles triangle abc with its base tx; z shoulder

for P2).

Thus, the torques generated at the points of engagement of the device for the support are mutually canceled. Calculations show that for a person’s weight 100

kg and foot length of 0.26 m in point-; the engagement of the device, the support reaction is. Pi РЗ + 271 kg: Р2 578 kg, which is significantly more than a person’s weight, and taking into account the strengths of the .JPIUIH, the reaction of the supports at each point, uv, begins by more than 80 kg. In addition to the south, calculations show that for a car with a forest of 1.5 kg, at the points of engagement, the support reaction, taking into account the friction force, is: at points b and 4.7 kg, and at a, 10 kg, which is much more

the weight of the device; Thus, the device does not slide off the beam yes; pid the action of your own nezz

The distance between the pore and the bottom stops is selected from the range of the ratios. The moment of creation, j is the weight of the person, is equal to

M-R I where P is the weight of a person, kg,

I - foot length, person m

The moment created by the support reaction at the pivot point of the third stop:

M2 P2 12 M,

where P2 is the support reaction of the third stop;

2 - distance between the third stop and two stops on the opposite sponge - median of an isosceles triangle abc

R2 g P I; i p I

. for the same foot size and weight of a person, an increase in g leads to a decrease in the support reaction at the point of engagement of the third stop, which is the limitation of the value of g from above, the lower limit is determined by the thickness d of the beam:

d g

R

Claims (4)

1. A device for lifting along a beam containing a support platform for placing 30 legs, means of attaching to the foot and a pair of stop plates forming between 0 five 0 five 0 is a gap for interaction with a beam, characterized by a hem, that, in order to increase reliability and ease of operation, the supporting platform is made in the shape of a foot, the anvil plates are attached to its toe part, and the anvil plate, located on the side of the heel, is provided with two additional stops located not above the plane of the supporting platform, but the opposite thrust plate is provided with one additional stop located above the plane of the supporting platform and installed with the possibility of axial adjustment ovochnogo movement. 2. The device pop. 1, which differs from the fact that the additional stops are made conical, and their tops form an isosceles triangle. 3. The device according to paragraphs. 1 and 2, which differs from the fact that the supporting platform is provided with stiffening ribs, directed radially from its center to the toe, and with an arcuate plate with holes, the envelope of the flat part and fixed on its lateral sides. 4. A device according to claims 1 to 3, characterized in that two stops, located not higher than the plane of the supporting platform, are mounted on the support plate by means of a thread and are provided with annular restrictive shoulders. 1 3 B rfig, 2 Type A Fig.Z 4 Phage. 7