JPH087873Y2 - Safety device for fall prevention - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a fall prevention safety device used when vertically moving a high-rise object in electric work or the like.

(Prior Art and Problems) As a fall preventive safety device that has been widely used in the past, as shown in FIG. 6, a single locking lever 21 was provided in the main body. The sliding groove 22 provided on the locking lever 21 is fitted on the rail R to move up and down, and in the unlikely event of a fall, the rope connected to the locking lever 21 is pulled downward by the falling load of the human body. As a result, the locking lever 21 rotates about the shaft 23, and slidingly locks with the rail to stop the fall.

In other words, the lifting and lowering is performed only by the operator's own arm and foot, and the safety device follows the movement thereof, so to speak, it is an auxiliary fall prevention measure. If the number of times of raising and lowering high-rise objects is small, no problem will occur, but if it repeats, arms and legs will be tired, and the gripping force of ladders, step bolts, etc. will decrease, and the rate of falls will increase. It is possible to do.

(Means for solving the problem) Therefore, in the present invention, the safety device and the human body are integrally moved up and down to reduce the load on the arm, so that the safer lifting can be performed. In addition, an auxiliary lever is provided, the ends of both are connected by a connecting lever to provide a two-section, three-link mechanism, and the connecting portion provided on the connecting lever is pulled in a direction away from the rail R. The sliding groove and the rail R are disengaged so that the rail R can be freely moved up and down. The engagement between the moving groove and the rail R is obtained.

That is, during the lifting operation, the rope of the safety belt is passed through the connecting portion and the steps of the ladder are sequentially climbed up and down, whereby the link mechanism is naturally rotated, and the engagement between the sliding groove and the rail R is released. In other words, it is possible to raise and lower in a form in which the weight is applied to the safety device, and the fatigue of the worker can be reduced.

(Operation) In the present invention, the connecting lever 12 that connects the ends of the locking lever 6 and the auxiliary lever 10 constitutes a two-section, three-link mechanism. The central axis direction of the auxiliary lever 10 is crossed on the body frame 1 side.

Therefore, as shown in Fig. 4 (b), the direction away from the rail, that is, mainly A, and the natural force that the person using the present invention moves up and down is transmitted through the rope, and actually the right shoulder than A. A resultant force in the ascending direction is generated, and the connection point of the auxiliary lever 10 with the connecting lever 12 is rotated in a direction away from the rail R, and the sliding groove of the locking lever 6 is connected to the rail by chain rotation of the link mechanism. It becomes parallel and maintains the disengaged state. Unlike the conventional example shown in FIG. 5 (b), it is not necessary to pull up with the force in the B direction to disengage the engagement between the locking lever and the rail R. By doing so, it is possible to move up and down with less fatigue by putting weight on the safety device.

(Embodiment) As one embodiment of the present invention, a pair of body frame 1 side plates 2 and 2 are connected at a predetermined interval, rollers 3 and 4 are provided in an axial direction intersecting at 90 °, and both side edges of a rail R are provided. For sliding on the front and back and both edges. A locking lever 6 is rotatably attached to a shaft stopper 8 at a substantially central portion of the main body frame 1, and the locking lever 6 is fitted to both side edge portions of the rail R and slidably locked. The groove 5 is engraved. Further, in the shaft stopper 8, a spring 7 is arranged so that the sliding groove 5 and the rail R are always engaged. The body frame 1 is also provided with an auxiliary lever 10. The position of the shaft stop 9 of the auxiliary lever 10 is the lower position of the locking lever 6 when the safety device is in use, and the sliding groove 5 is provided in the locking lever 6, whereas the auxiliary lever 10 does not. One end of the locking lever 6 projecting from the body frame 1 and one end of the auxiliary lever 10 are rotatably connected by a connecting lever 12 to form a two-section, three-link mechanism. The central axis direction of the locking lever 6 and the central axis direction of the auxiliary lever 10 intersect in the vicinity of the rail R on the main body frame 1 side.

That is, in the two-section three-link mechanism including the locking lever 6, the auxiliary lever 10, and the connecting lever 12, the locking lever 6,
The distance between the axes that pivotally mount the auxiliary lever 10 on the main body frame 1 is shorter than the distance between the axes that pivotally connect the levers 6 and 10 to the connecting lever 12, respectively. In the state of engagement with the rail R of the safety device of the present invention in FIG. Therefore, the locking lever 6 and the auxiliary lever in the engaged state with the rail R
The extension line of the central axis of 10 intersects near the engagement point between the locking lever 6 and the rail R. Further, even when the engagement between the locking lever 6 and the rail R is released as shown in FIG. 4 (b), this intersection is located immediately behind the rail R at the engagement point.

By using the above configuration, the force in the A direction (strictly speaking, the force to the upper right in FIG. 4) is small, and the function is exerted in the normal natural elevating state.

The connecting lever 12 is provided with an annular connecting portion 11 for inserting a safety belt rope.

Although the present invention having the above-described structure is used, as shown in FIG.

The rope of the safety belt is passed through the connecting portion 11, and the safety device is positioned in front of the waist in a state where the step is naturally raised and lowered by adjusting the length of the rope. When the waist is slightly separated from the step, the connecting lever 10 is pulled and the link mechanism is rotated, so that the sliding groove 5 of the locking lever 6 is disengaged from the rail R, and the rail R can be moved up and down.

Therefore, the rail R and the waist of the worker are connected, and the user can move up and down in a psychologically secure posture.

Also, by bringing the waist close to the rail R, the locking lever 6
The link mechanism is restored by the force of the spring 7 placed on the rail R, the rail R is engaged, the weight can be put on the foot, and rest can be performed on the spot, so that the arm can be rested. In the conventional safety device, it was necessary to put effort into the arm portion.

(Effect of the Invention) As described above, by using the present invention, the direction in which the engagement between the locking lever 6 and the rail R is released by the link mechanism can be changed, so that it is an auxiliary one that follows the conventional lifting. In addition to the safety device, a leading part that interlocks with the movement of the worker's waist is added, and it is possible to obtain a safer fall prevention device, such as being able to rest during lifting.

[Brief description of drawings]

 FIG. 1 is a front view of the present invention, FIG. 2 is a left side view, FIG. 3 is a central vertical sectional view of a front view, FIG. 4 is a schematic operation diagram, and FIG. 5 is a schematic operation diagram of a conventional product, FIG. Is a cross-sectional view of a conventional product, and FIG. 7 is a usage state diagram. Reference numeral in the drawing 1 ... Main body frame, 2 ... Side plate 3,4 ... Roller, 5 ... Sliding groove 6 ... Locking lever, 7 ... Spring 8,9 ... Shaft stop, 10 ... Auxiliary Lever 11 …… Coupling part, 12 …… Coupling lever R …… Rail

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takehiro Shiju, 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Hideaki Minade 1-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo No. 6 Japan Telegraph and Telephone Corporation Examiner Toru Hongo (56) References Japanese Patent Publication No. 55-40266 (JP, B2) Japanese Patent Publication No. 58-48188 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. Rollers 3 and 4 for sliding the front and back sides of both sides of the rail R and both edge portions are provided between the side plates 2 and 2 of the main body frame 1 and fitted and slid on both side edges of the rail R. In a fall prevention safety device, in which a locking lever 6 having a sliding groove 5 for locking is always provided with a spring 7 in a sliding and locking direction with a rail R so as to pivotally stop 8, a space between main body frames 1 is provided. The other end of the auxiliary lever 10 whose one end is axially stopped 9 is substantially parallel to the main body frame 1,
A coupling lever 12 having 11 is pivotally attached to one end of the coupling lever 12
2 bar 3 configured by axially locking the other end of the locking lever 6 and the other end of the locking lever 6
In the link mechanism, the intersection of the extension line of the central axis of the locking lever 6 and the extension line of the central axis of the auxiliary lever 10 is intersected very close to the front side or the back side of the rail R on the body frame 1 side. Safety device for fall prevention.