JPH10178717A - Safety device for work at high place - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweigth safety device having sufficient structural safety, which can be easily coupled to a structure at a site, where a work is performed at a high place such as telephone cable and a lifeline reel attached to the high place of work can be raised easily near the structure. SOLUTION: Linking rods 12a and 12b are fixed to the main body 2 of an equipment. Slide members 6a, 7, 8 and 10 are guided to a slot 3a and are slidden between a lock position, entering the gap between linking rods and a lock- release position where the member withdraws from the lock-releasing position. A wedge-shaped member 5 and a pulley 4 are attached to the slide members. A slide member is at the lock position at normal times, the wedge-shaped member enters a gap between linking members, a main rope 11 is clamped between the wedge-shaped member and the linked member. If a portion at the lever side of the main rope is pulled off, then a lever 9a is rotated around the linking bar 12b, the slide member assumes a lock-releasing position and the wedge- shaped portion withdraws from the gap stated above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for work at a high place, which is connected to a structure such as a telephone line or an electric wire at a work place at a high place, and is used by attaching a lifeline take-up reel having an emergency stop function. Things.

[0002]

2. Description of the Related Art In recent years, bucket vehicles are often used in construction of telephone lines and electric wires. Then, the worker gets on the bucket and places the bucket near the work position to perform the work. However, in places where the road width is narrow and a bucket truck is difficult to enter, construction is performed by workers climbing to the work position by putting their feet on the nails of the utility pole.

[0003] However, many pillars such as telephone lines and electric wires are made of wood, and the pillars may be rotten due to long-time use. The operator may fall.

In order to prevent such an accident, a life rope take-up reel having an emergency stop function is used. And when using reels, the standard length of the lifeline of the reel is about 6 m, and telephone lines, electric wires and other structures are usually located at a height of about 6 m from the ground. A push-up bar having a length of about 6 m is used.

[0005] That is, as shown in FIG. 14, the ring 36 attached to the attachment portion of the hook 33 above the reel 30.
Is caught by the tip of the push-up bar 25 and the reel 3
The hook 31 at the tip of the lifeline 34 of the 0
7 are linked. Then, the hook 33 of the reel 30 is hooked on a structure such as the telephone line or the electric wire 35 by the push-up bar 25. Then, the hook 31 of the lifeline 34 is connected to the D-ring of the trunk belt of the worker in a state where the lifeline extension string 37 is dragged by hand and the lifeline 34 is pulled out. In this way, the worker climbs the telephone pole or the ladder while sequentially winding the lifeline onto the reel to reach the work position, so that the worker can be rescued in the event of a fall.

However, at this time, the reel used is
It must have a structure that meets the safety standards set by the Ministry of Labor, and therefore weighs about 2 kg. On the other hand, as shown in FIG. 14, in order to hook the hook 33 of the reel 30 to a structure such as a telephone line or an electric wire 35, a loop 36 of the reel 30 is hung on the tip of the push-up bar 25, and this is lifted upward. Have to operate. As a result, this work is very difficult, especially when the work site is windy.

[0007]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a lighter and more structurally safe structure than conventional lifeline take-up reels, and to simplify the construction of telephone lines and the like at high-altitude work sites. It is an object of the present invention to provide a safety device for working at a high place, which can be connected to a safety net and can easily lift a lifeline take-up reel attached to the vicinity of a structure.

[0008]

According to the present invention, there is provided, in accordance with the present invention, a construction for connecting to a building at an aerial work site,
What is claimed is: 1. A safety device for working at a high place using a lifeline take-up reel, comprising: an apparatus main body; two locking members fixed to the apparatus main body and spaced apart from each other; and a locking member in the apparatus main body. A wedge-shaped member provided at a lower end thereof, and a slide member slidable between a lock position where the wedge-shaped member enters the gap between the locking members and an unlocked position where the wedge-shaped member retracts from the gap. A pulley attached to the upper end of the slide member, an axis fixed to the slide member perpendicular to the slide surface, and one end attached to the axis, around the axis in a plane parallel to the slide surface. A rotatable lever, a roller attached to the other end of the lever, a support shaft fixed to a lower side of the lever in the apparatus main body, and an abutment of an intermediate portion of the lever, and a suspension on the pulley. A flat belt-shaped or rope-shaped master rope, and a connecting portion to a structure provided at the upper part of the apparatus main body. A safety device for working at height is characterized in that a lifeline take-up reel is attached to a portion of the parent line which is hung on the roller and which is located on the side opposite to the lever.

In the above device, the two locking members are 2
It is preferable that the locking rods are formed of book locking rods and the locking rods related to the lever form a support shaft. Alternatively, in the above-described device, the two locking members include two plate-shaped members, each of the plate-shaped members having an inclined surface on one side, the inclined surfaces facing each other, and the gap between the plate-shaped members is downward. The wedge-shaped member is formed with a guide groove for the master rope on the inclined surface of the wedge-shaped member, and the guide groove has a projection extending in the width direction in the length direction of the guide groove. It is preferable to adopt a configuration in which they are formed at intervals.

According to the present invention, there is provided a safety device for high place work, which is connected to a structure at a high place work site and used by attaching a lifeline take-up reel.
A locking position fixed to the device main body, a locking member fixed to the device main body, and a wedge-shaped member attached to a lower end portion of the device main body, wherein one side edge of the wedge-shaped member is close to the locking member; A sliding member slidably disposed between an unlocked position at which the wedge-shaped member is separated from the locking member, a pulley attached to an upper end of the sliding member, and a sliding member which is perpendicular to the sliding surface. A shaft fixed to the shaft, a lever having one end attached to the shaft and capable of rotating around the axis in a plane parallel to the slide surface, a roller attached to the other end of the lever, and a lower portion of the lever in the apparatus main body. Side, a support shaft to which the middle part of the lever can abut, a flat belt-shaped or rope-shaped main rope hung on a pulley, and a link to a structure provided on the upper part of the apparatus body. The part of the master rope located on the lever side is hung on the roller of the lever, and the part of the parent rope opposite to the lever is provided with a lifeline take-up reel. A safety device for working at height is configured.

In these configurations, preferably, a shock absorber is connected between the device main body and the hook, or at the lower end of the main rope portion opposite to the lever.

[0012]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are plan views showing a safety device for aerial work according to an embodiment of the present invention. In FIG. 1, the device according to the present invention is in a locked state, and in FIG. 2, the device is in an unlocked state. . FIG. 3 is an exploded perspective view of the apparatus of FIG.

As shown in FIGS. 1 to 3, a safety device 1 for working at height according to the present invention includes a device main body 2 composed of a pair of identical metal plates 2a and 2b spaced from each other. I have. Slots 3a and 3b are formed in the pair of metal plates 2a and 2b at the substantially central portions, respectively, along the longitudinal direction. On both sides of one end (lower end) of each of the slots 3a and 3b, locking rods 12a and 12b as locking members are provided.
It is arranged penetrating a pair of metal plates 2a, 2b, and is fixed to these.

A pulley 4 and a wedge-shaped member 5 are arranged between the pair of metal plates 2a and 2b with play between the metal plates 2a and 2b. At this time, the positional relationship is such that the wedge-shaped member 5 is disposed below the pulley 4 (on the locking rod side).

A connecting plate 6 for connecting the pulley 4 and the wedge-shaped member 5 is provided outside each of the metal plates 2a and 2b.
a and 6b are arranged. Pulley 4 is slot 3
a, 3b are attached to the connecting plates 6a, 6b by pins 7 which pass therethrough, and are rotatably arranged around the pins 7. The wedge-shaped member 5 extends through the slots 3a, 3b.
It is fixed to the connecting plates 6a and 6b by the pins 8 and 10. The wedge-shaped member 5 includes a main body portion having a substantially constant width on the pulley side, and a tapered portion extending downward from the main body portion.

The pin 7 and a pair of connecting plates 6a, 6b connected by the pins 8 and 10 form slots 3a,
A slide member guided slidably by 3b is formed. The slide member is mounted above the locking rods 12a and 12b in the apparatus main body 2 and includes a wedge-shaped member 5 at the lower end, and the wedge-shaped member 5 enters a gap between the locking rods 12a and 12b; The wedge-shaped member 5 is slidably disposed between an unlocked position where the wedge-shaped member 5 is retracted from the gap.

On both side edges of the pair of metal plates 2a and 2b, a metal coupling plate 29 having a width corresponding to a gap between these metal plates is provided.
Are welded, and the metal plates 2a and 2b are connected to each other through the connecting plate 29.

Operation levers 9a and 9b are arranged outside the connecting plates 6a and 6b. A pair of operation levers 9
One end of each of a and 9b is attached to the pin 10, and is rotatable around the pin 10 in a plane parallel to the slide surface of the slide member.

A flat belt-shaped master rope 11 is suspended from the pulley 4.
It extends into the gap between b. Parent rope 11 according to this embodiment
Has a width of 10 mm to 30 mm and a thickness of 1.5 mm to 5 mm, and has, for example, the following configuration. Example 1 warp ground nylon (1680 denier x 4) x 55 warp nylon Nylon (1680 denier x 2) x 16 weft nylon (1680 denier) x 2, 25 mm
Twenty strands between them 4mm in thickness and 18.5mm in width In the case of this parent rope, the tensile strength is 2550kg and the elongation is 50
It is 20% at 0 kg load. Specific Example 2 Warp ground aramid (1500 denier x 4) x 54 warp ear aramid (1500 denier x 2) x 17 weft aramid (400 denier) x 2 and 18 in between 25 mm 4mm thick, 18.5mm wide In the case of this parent rope, the tensile strength is 7000kg and the elongation is 50
It is 3% at 0 kg load.

A connecting ring 13 is provided on the upper part of
4 and a hook 23 is connected to the connection ring 13. The hook 23 has a ring 24.

On one metal plate 2a of the apparatus main body, a projection 15 is provided at a position between the slot 3a and the pin 14. A spring 16 is attached to the projection 15. One end of the spring 16 is connected to the pin 14 and the other end is connected to the connecting plate 6.
a is fixed to the upper end. Thus, the slide member is constantly biased toward the locked position by the elastic force of the spring 16.

Further, one end of the spring 17 is fixed to the projection 15 and the other end is fixed to the operation lever 9a. The operation levers 9a and 9b are moved by the elastic force of the spring 17.
1 and 2, the pin 10 is always urged counterclockwise with respect to the pin 10. Also, two operation levers 9
a, 9b, a rod 1 is inserted through each operating lever.
A slide tube 19 is fitted into the rod 18 to form a kind of roller.

The master rope portions on the side of the operation levers 9a and 9b are suspended from the slide tube 19 through the lower surface of the locking rod 12b. In addition, the master rope portion opposite to the operation lever extends downward from the pulley 4 through the space between the locking bar 12a and the wedge-shaped member 5.

The locking rod 12b has both ends protruding outside the apparatus main body 2, and both ends are connected to the operating lever 9
The recesses 20a, 20b formed in the intermediate portions of the a, 9b form a support shaft that can abut.

The slide member is always in the locked position due to the elastic force of the spring 16, and the wedge-shaped member 5 has the locking rod 12a,
The main rope 11 enters into the gap between the rods 12b, and is firmly held between the wedge-shaped member 5 and the locking rods 12a, 12b (see FIG. 1). From this state, when the main rope portion of the operation levers 9a, 9b suspended on the slide tube 19 is pulled downward, the operation levers 9a, 9b are rotated clockwise with respect to the pin 10 against the elastic force of the spring 17. Operation levers 9a, 9
b until the recesses 20a and 20b of the b contact the support shaft (the locking rod 12b).

When the main rope portion is further pulled downward, the operation levers 9a and 9b rotate clockwise with respect to the support shaft (locking rod 12b), and the slide member opposes the elastic force of the spring 16, It moves along the slots 3a, 3b and assumes the unlocked position (see FIG. 2). Thereby, the wedge-shaped member 5 retreats from the gap between the locking rods 12a and 12b,
The holding of the master rope 11 is released. In this state, the master rope 11 can be freely pulled to either the left or right side of the pulley 4.

When this pulling operation is stopped, the operating levers 9a and 9b are rotated counterclockwise with respect to the pin 10 by the elastic force of the spring 17 to separate from the support shaft, and at the same time,
The slide member slides again to the locked position by the elastic force of the spring 16, and the wedge-shaped member 5 is
The main rope 11 is inserted into the gap between the wedge-shaped member 5 and the locking rod 1.
2a and 12b. At this time, when the master rope portion opposite to the operation levers 9a, 9b is pulled, the master rope 11 is firmly held between the wedge-shaped member 5 and the locking rods 12a, 12b.

In this embodiment, the spring 16 is provided to always bias the slide member toward the lock position. However, the spring 16 can be omitted.
In this case, the operating levers 9a, 9b
By pulling the opposite part downward, the slide member manually assumes the locked position. Further, in this embodiment, a spring 17 for urging the operation levers 9a and 9b counterclockwise with respect to the pin 10 is provided, but this spring 17 may be omitted.

FIG. 4 is a view showing a state in which the safety device for aerial work according to the present invention is connected to a structure at an aerial work site such as a telephone line or an electric wire. As shown in FIG. 4, the loop 24 of the device 1 according to the present invention is hooked on the tip of the push-up bar 25. The hook 23 of the device is hooked on a telephone line or the like by operating the push-up bar 25, and the device is connected to the telephone line or the like. In this case, the device 1 according to the invention comprises:
The weight is about 300 g, which is about 1/7 of the weight of the conventional rope take-up reel with an emergency stop function. Therefore, even when the wind speed is 5 m, the hook 23 can be easily hooked on the structure about 6 m above the ground.

As shown in FIG. 4, the lower end of the part of the master rope 11 opposite to the operation levers 9a and 9b has
A hook 22 for connecting the lifeline take-up reel is attached. Further, in the embodiment of FIG. 4, a shock absorber 21 is attached between the master rope 11 and the hook 22, so as to further reduce the impact of the worker in the event of a crash. The shock absorber 21 may be mounted between the connecting ring 13 and the hook 23 as shown in FIG. In this embodiment, the impact load of the shock absorber is set to 150 kg in consideration of the impact load applied to the worker in the event of a crash.

After the device 1 according to the present invention is connected to a telephone line or the like, a conventional lifeline take-up reel is connected to the hook 22 at the lower end of the parent line 11, and the hook at the end of the lifeline take-up reel of the lifeline take-up reel is connected to the hook. The feeding string is connected, and the operation lever 9a,
The main rope portion 11 on the 9b side is pulled downward. And
As shown in FIG. 6, the lifeline take-up reel 30 is raised to the vicinity of the device 1 according to the invention. Operation lever 9
When the operation of pulling the master rope portion 11 on the side of a, 9b is stopped, the master rope 11 is automatically firmly clamped between the locking rods 12a, 12b and the wedge-shaped member 5, and locked so as not to move. You. At this time, when the master rope portion opposite to the operation levers 9a, 9b is pulled, the master rope 11 is firmly held between the wedge-shaped member 5 and the locking rods 12a, 12b.

Thereafter, as shown in FIG. 7, the payout string 37 is pulled, the lifeline 34 is pulled out from the reel 30, and the hook 31 of the lifeline 34 is attached to the worker's safety belt 32.
Is connected to the D ring 38. Then, the worker climbs a telephone pole or a ladder and performs work at a work site. After the work is completed, the worker descends on the ground and attaches the hook 31 of the lifeline to the D ring 3
8, the lifeline 34 is strongly pulled and the reel is locked, and in a state where the reel is locked, the masterline portion 11 on the operation levers 9 a and 9 b side is strongly pulled to unlock the device 1. Then, the master rope 1 on the opposite side of the operation levers 9a and 9b as it is
While pulling lightly on 1, lower the reel 30 on the ground,
Remove from the hook 22 of the device 1. Thereafter, the device 1 is removed from the telephone line or the like by the push-up bar and collected.

FIGS. 8 and 9 are plan views showing a safety device for aerial work according to another embodiment of the present invention. In FIG. 8, the device according to the present invention is in an unlocked state, and in FIG. Locked. FIG. 10 is an exploded perspective view of the apparatus of FIG. The embodiment shown in FIGS.
It differs from the embodiment shown in FIGS. 1 to 3 only in the configuration of the wedge-shaped member and the locking member, and in the main rope used. Therefore, in FIG. 8 to FIG. 10, the same components as those in FIG. 1 to FIG.

As shown in FIGS. 8 to 10, in this embodiment, the two locking members are two plate-like members 40a and 40b.
Consists of The plate-shaped members 40a and 40b are respectively
One side has inclined surfaces 41a and 41b. And 2
One plate-like body 40a, 40b is a pair of metal plates 2a, 2b
Are arranged so that the inclined surfaces 41a and 41b face each other and the gap between the plate-like bodies tapers downward. Then, the plate-like bodies 40a, 40b
Are two pins 42a and 43a penetrating a pair of metal plates 2a and 2b, respectively, and 42b and 43b
Are fixed to the metal plates 2a and 2b.

FIG. 11 is a diagram showing the configuration of the wedge-shaped member in detail. According to FIG. 11, the wedge-shaped member 44 of the device according to this embodiment has a guide groove 46 formed on an inclined surface 45 for a master rope 48. Further, the guide groove 46
Are formed with projections 47 extending in the width direction at intervals in the length direction of the guide groove.

The pair of operation levers 9a and 9b are respectively
One end is attached to the pin 8 and is rotatable around the pin 8 in a plane parallel to the slide surface of the slide member. The master rope 48 is formed in a rope shape.

With this configuration, the slide member is always in the locked position, and the wedge-shaped member 44 is
b, and at the same time, the master rope 48 is sandwiched between the wedge-shaped member 44 and the plate-shaped bodies 40a, 40b while being fitted into the guide groove 46 of the wedge-shaped member 44,
The protrusion 47 of the guide groove 46 cuts into the master rope 48. Accordingly, the master rope 48 includes the wedge-shaped member 44 and the plate-shaped bodies 40a, 4a.
0b, and is locked so as not to move (see FIG. 9).

In this state, when the master rope portion located on the side of the operation levers 9a and 9b is pulled downward, the recesses 20a and 20b of the operation levers 9a and 9b come into contact with the pins 43b, and the operation levers 9a and 9b are It rotates around 43b as a support shaft. As a result, the sliding member slides from the locked position to the unlocked position against the elastic force of the spring 16, and the wedge-shaped member 44 is moved to the plate-shaped members 40a, 40b.
Withdraw from the gap between Then, the master rope 44 can be freely pulled to either side of the pulley 4 (see FIG. 8).

The method of using the apparatus according to this embodiment is shown in FIGS.
It is needless to say that this embodiment is the same as the embodiment of FIG. 3, and that the device according to this embodiment has the same effect as the device of the embodiment of FIGS.

FIGS. 12 and 13 are plan views showing a safety device for aerial work according to still another embodiment of the present invention. In FIG. 12, the device according to the present invention is in an unlocked state. , The device is in the locked state.
As can be seen from FIG. 12 and FIG.
In the embodiment shown in FIGS. 8 to 10, one of the locking members (plate-like body) 40a is omitted. Therefore, in FIG. 12 and FIG. 13, the same components as those in FIG. 8 to FIG.

In this embodiment, the slide member disposed above the plate-like body (locking member) 40b in the apparatus main body 2 has a locking position in which one side edge of the wedge-like member 44 is close to the plate-like body 40b; The wedge-shaped member 44 can slide between an unlocked position away from the plate-shaped body 40b.

The slide member is always in the lock position,
The wedge-shaped member 44 approaches the plate-shaped body 40b, and the master rope 48 is sandwiched between the wedge-shaped member 44 and the plate-shaped body 40b while being fitted into the guide groove 46 of the wedge-shaped member 44, and The projection 47 of 46 cuts into the parent line 48. Accordingly, the master rope 48 is sandwiched between the wedge-shaped member 44 and the plate-shaped body 40b and locked so as not to move (see FIG. 13).

In this state, when the master rope portion located on the side of the operation levers 9a and 9b is pulled downward, the operation levers 9a and 9b support the pin 43b after the concave portions 20a and 20b abut the pin 43b. It pivots about it as an axis. As a result, the slide member slides from the locked position to the unlocked position against the elastic force of the spring 16, and the wedge-shaped member 44 separates from the plate-like body 40b. And parent rope 4
4 can be freely pulled to either side of the pulley 4 (see FIG. 12). In this embodiment, the same effects as those of the embodiments shown in FIGS. 8 to 10 can be obtained.

[0044]

As described above, according to the present invention, the conventional lifeline take-up reel can be very easily and sufficiently connected to the structure at a work site at a high place. Work can be done.

[Brief description of the drawings]

FIG. 1 is a plan view of a safety device for aerial work according to an embodiment of the present invention, showing a locked state of the device.

FIG. 2 is a plan view showing an unlocked state of the device shown in FIG. 1;

FIG. 3 is an exploded perspective view of the device shown in FIG.

FIG. 4 shows the connection of the device according to the invention to a construction at an aerial work site, such as a telephone line, for example.

FIG. 5 is a diagram showing a configuration in which a shock absorber is connected between a connection ring and a hook of the device.

FIG. 6 is a view showing a state in which the device according to the present invention is connected to a structure such as a telephone line, and the main rope is pulled up to pull up the life rope take-up reel near the device.

FIG. 7 is a diagram showing a state in which a hook of a lifeline of the lifeline take-up reel is connected to a safety belt of an operator.

FIG. 8 is a plan view of a safety device for aerial work according to another embodiment of the present invention, showing the unlocked state of the device.

FIG. 9 is a plan view showing a locked state of the device shown in FIG. 8;

FIG. 10 is an exploded perspective view of the device shown in FIG.

FIG. 11 is a diagram showing a configuration of a wedge-shaped member in detail;
(A) is a front view, (B) is a side view.

FIG. 12 is a plan view of a safety device for aerial work according to still another embodiment of the present invention, showing the unlocked state of the device.

FIG. 13 is a plan view showing a locked state of the device shown in FIG.

FIG. 14 is a view showing a state in which a conventional lifeline take-up reel is hung on a telephone line or the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Safety device for work at height 2 Main body 2a, 2b Metal plate 3a, 3b Slot 4 Pulley 5 Wedge-shaped member 6a, 6b Connection plate 7 Pin 8 Pin 9a, 9b Operation lever 10 Pin 11 Parent rope 12a, 12b Lock rod 13 Connecting ring 14 Pin 15 Projection 16 Spring 17 Spring 18 Rod 19 Sliding tube 20a, 20b Recess

Claims (5)

[Claims] An aerial work safety device connected to a structure at an aerial work site and used by attaching a lifeline take-up reel, wherein the safety device is fixed to the device body and spaced apart from each other. Two locking members arranged; a locking position attached above the locking member in the apparatus body, including a wedge-shaped member at a lower end portion, and the wedge-shaped member entering a gap between the locking members; A slide member slidable between an unlocked position where the wedge-shaped member retracts from the gap, a pulley attached to an upper end of the slide member, and fixed to the slide member perpendicularly to a slide surface thereof A shaft attached to the shaft, one end of which is attached to the shaft, and a lever which can rotate around the axis in a plane parallel to the slide surface; and a lever attached to the other end of the lever. A roller, a support shaft fixed to a lower side of the lever in the apparatus main body, and an abutment of an intermediate portion of the lever; a flat belt-shaped or rope-shaped master rope suspended on the pulley; A connection portion for the structure provided at an upper portion, a portion of the master rope located on the lever side is hung on a roller of the lever via a lower surface of the locking member, and A safety device for working at height, wherein the life rope take-up reel is attached to a portion located on a side opposite to a lever. 2. The work for aerial work according to claim 1, wherein the two locking members include two locking rods, and one of the locking rods forms the support shaft. Safety device. 3. The two locking members include two plate-like members, each of which has an inclined surface on one side,
The inclined surface faces each other and is attached to the apparatus main body so that a gap between the plate-like bodies is tapered downward, and a guide groove for the master rope is formed on the inclined surface of the wedge-shaped member. 2. The safety device according to claim 1, wherein the guide grooves are formed with projections extending in the width direction at intervals in the length direction of the guide grooves. 4. A safety device for aerial work, which is connected to a structure at an aerial work site, and is used by attaching a lifeline take-up reel, comprising: an apparatus main body; a locking member fixed to the apparatus main body; A lock position is provided above the locking member in the apparatus main body, and a wedge-shaped member is provided at a lower end portion, and a side edge of the wedge-shaped member is in a lock position close to the locking member, and the wedge-shaped member is separated from the locking member. A slide member slidably arranged between the separated unlock position, a pulley attached to an upper end of the slide member, and an axis fixed to the slide member perpendicular to a slide surface thereof, A lever having one end attached to the shaft and rotatable around the axis in a plane parallel to the slide surface; a roller attached to the other end of the lever; A support shaft fixed to the lower side of the lever at which an intermediate portion of the lever can abut, a flat belt-like or rope-like master rope hung on the pulley, and the main body provided at an upper portion of the apparatus main body. A portion of the master rope located on the lever side is hung on a roller of the lever, and a portion of the master rope located on the opposite side to the lever is provided with the life rope take-up. A safety device for working at height, wherein a reel is mounted. 5. The shock absorber according to claim 1, wherein a shock absorber is connected between the device main body and the hook or at a lower end of the master rope portion opposite to the lever. The safety device for working at height described in Crab.