JP2002191710A - Safety post for fall prevention - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety post for fall prevention, which is suitable to be used by temporarily installing on an elevator cage. SOLUTION: This safety post for fall prevention comprises a multiple cylindrical body 1 which is stretchable, and can be locked under a stretched state. The safety post for fall prevention is equipped with an attaching section 5, a fastener 9 such as a safety rope, and a lock releasing means 22. In this case, the attaching section 5 is provided at the lower end of the outermost cylindrical body 2 of the multiple cylindrical body 1. The fastener 9 is provided at the upper end of the innermost cylindrical body 4 of the multiple cylindrical body 1. The lock releasing means 22 automatically releases the locking of a locking means 12 located between the innermost cylindrical body 4 and an external cylindrical body (intermediate cylindrical body) 3 directly under the innermost cylindrical body 4. The lock releasing means 22 is equipped with an operation piece 25 which is arranged vertically movably under a state protruding upward from the upper end of the innermost cylindrical body 4. Also, the lock releasing means 22 is urged to an upper moving limit location by a spring 26. Then, the safety post for fall prevention is constituted in such a manner that when the operation piece 25 is depressed, the lock releasing means 22 may perform the lock releasing motion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to lock a fall-preventing safety rope connected to a worker's waist, or to stretch a main rope for locking the safety rope. The present invention relates to safety pillars for fall prevention.

[0002]

2. Description of the Related Art This type of safety strut is provided with a locking portion for locking a safety rope or a main rope at an upper end of a strut having a mounting portion at a lower end. The props are
The above-mentioned support | pillar was comprised by the fixed height generally, and the fixed height of an operator's waist height (in order to make the fall distance at the time of a fall accident as short as possible).

[0003]

Therefore, a conventional safety support is used by mounting it on the ceiling of an elevator cage in order to prevent a worker who gets on the ceiling of the elevator cage from falling for maintenance and inspection of the elevator, for example. In the case, in the case of an elevator of a type in which the machine room is not provided above the elevator cage at the ascending position, that is, an elevator in which a space equal to or higher than the height of the safety strut is not secured above the elevator cage at the ascending position, When the elevator is lifted to the upper limit without forgetting to remove the safety post after the maintenance work, the safety post is crushed between the elevator cage and the ceiling of the building above it, or This may lead to an accident that damages the ceiling and the ceiling of the building above it.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safety column for preventing a fall which can solve the above-mentioned conventional problems. A safety support column for fall prevention, comprising a multi-tubular body 1 which is extendable and contractable and can be locked in an extended state, is provided at the lower end of the outermost cylindrical body 2 of the multi-tubular body 1. A locking member 9 such as a safety rope provided at the upper end of the innermost tubular body 4 of the multiple tubular body 1;
And an unlocking means 22 for automatically unlocking the locking means 12 between the innermost cylindrical body 4 and the outer cylindrical body (intermediate cylindrical body) 3 immediately below the innermost cylindrical body 4.
Is provided with an operation piece 25 that is vertically movably disposed in a state of protruding above the upper end of the innermost cylindrical body 4 and is urged to an upper limit position by a spring 26, and the operation piece 25 is pushed down. Then, the unlocking means 22 performs an unlocking movement.

In implementing the safety column of the present invention having the above configuration, specifically, the locking means 12 is provided with a locking pin 15a penetrating through a through hole 14a provided in a side wall 4a of the innermost cylindrical body 4. And a spring 16 for urging the locking pin 15a outward, and the outer cylindrical body (intermediate cylindrical body) 3 adjacent to the innermost cylindrical body 4 and the locking pin 15a is fitted. A detachable locking hole 17a is provided, and an operated portion (the leg 16 of the leaf spring 16) is provided at the inner end side of the locking pin 15a.
a), and the unlocking means 22 is provided with an elevating operation body 24 which moves up and down in conjunction with the operation piece 25, and the lower part of the elevating operation body 24 is moved downward by the operated part ( Locking pin 15a via the leg 16a) of the leaf spring 16
Operating part 28 for moving the inward and detaching from the locking hole
a can be provided.

The spring 16 for urging the locking pin 15a outwardly has one end attached to the inner end of the locking pin 15a and extending obliquely upward from the locking pin 15a. Using a leaf spring 16 also serving as the operated part,
The operation unit 28a of the lifting operation body 24 is
And the plate spring 16 can be pressed down and deformed inward by entering the space between the inner wall and the cylindrical body side wall 4a on the side where the locking pin 15a is located.

In the case of adopting the above configuration, the locking pin 1
A pair of left and right locking pins 15a, 15b is provided on the outer sides of both ends of the pair of locking pins 15a, 15b. At least one of the locking pins 15a is configured to be non-rotatable with respect to the through hole 14a, and the operating portions 28a and 28b of the lifting / lowering operating body 24 are provided with the two leg portions 16a and 16b of the mountain-shaped leaf spring 16. And a pair of left and right sides can be provided so as to act on.

The operation piece 25 is provided with the lifting operation body 2.
4 is composed of a bolt fixed to the upper end of the multi-tubular body 1 and vertically penetrating the upper end of the multi-tubular body 1, between the nut 25 a screwed to the operation piece (bolt) 25 and the upper end of the multi-tubular body 1. The operation piece (bolt) 2 is attached to the operation piece (bolt) 25.
A compression coil spring as the spring 26 for urging the upper part 5 upward can be interposed.

In the case where the multiple cylindrical body 1 constituting the support is composed of three or more cylindrical bodies 2 to 4, the second or lower stage from the top in the extended state of the multiple cylindrical body 1 As locking means 13 for locking the inner and outer cylindrical bodies 2 and 3 of
Innermost cylindrical body 4 and outer cylindrical body immediately below (intermediate cylindrical body)
3, using the same configuration as the locking means 12 between
The unlocking means 23 for the second and lower locking means 13 is also used as the upper inner cylindrical body (innermost cylindrical body) 4 descending inside the inner cylindrical body (intermediate cylindrical body) 3. The operating section 31a can be provided at the lower end of the upper inner cylindrical body (innermost cylindrical body) 4 so as to perform the operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a multi-tubular body which is stretchable and can be locked in an extended state.
In this embodiment, three rectangular cylindrical bodies 2 to 4 fitted to each other are used.
It is composed of Reference numeral 5 denotes a mounting portion provided at the lower end of the outermost tubular body 2. The mounting portion 7 has a mounting plate 7 having mounting holes 6 at both ends, and the lower side of the mounting plate 7 and the outermost tubular body 2. Although it is composed of a pair of fixed reinforcing plates 8, various types of clamps having fastening screws can be used. Reference numeral 9 denotes a locking device such as a safety rope provided at the upper end of the innermost tubular body 4, which is fixed so as to cover the upper end of the innermost tubular body 4 and extends to both sides.
Although the locking holes 11 are provided at both ends of the zero, any other configuration may be used.

Reference numeral 12 denotes a locking means between the innermost cylindrical body 4 and the outer cylindrical body (intermediate cylindrical body) 3 immediately below the innermost cylindrical body 4.
Is a locking means between the intermediate tubular body 3 and the outer tubular body (outermost tubular body) 2 immediately below the intermediate tubular body 3. These locking means 1
2 and 13 automatically lock the multiple cylindrical body 1 in the extended state shown in FIG. 1A. As shown in FIG. 4a, 4
square holes 14a, 14b provided near the lower end of b
A pair of prismatic locking pins 15a,
15b and one mountain-shaped leaf spring 1 having both legs 16a, 16b fixed to the inner ends of the locking pins 15a, 15b.
6 and the locking pin 15 provided at a position near the upper end of an outer cylindrical body (intermediate cylindrical body 3) adjacent to the innermost cylindrical body 4.
a, 15b are rectangular locking holes 17a, 17
b. Therefore, both locking pins 15a,
15b against the urging force of the leaf spring 16
Both locking pins 15a, 15b are supported by the innermost cylindrical body 4 unless they are depressed and separated from the innermost cylindrical body 4 from the innermost cylindrical body 4.

The second-stage locking means 13 has the same structure as the locking means 12, and as shown in FIGS. 2 and 4, opposing side walls of the inner cylindrical body (intermediate cylindrical body 3). so,
The opposite side walls 3a, 3b, which are orthogonal to the opposite side walls of the locking means 12 where the locking holes 17a, 17b are provided.
Through holes 18a, 18 provided near the lower end of 3b.
b and a pair of prism-shaped locking pins 19 that penetrate through the shaft b so that they cannot rotate.
a, 19b, one mountain-shaped leaf spring 20 having both legs 20a, 20b fixed to the inner ends of the locking pins 19a, 19b, and an inner cylindrical body (intermediate cylindrical body 3). It is provided at a position near the upper end of the outer cylindrical body (outermost cylindrical body 2), and is formed of rectangular locking holes 21a, 21b into which the locking pins 19a, 19b can be fitted and disengaged. Therefore,
As long as the locking pins 19a and 19b are not pressed and released from the through-square holes 18a and 18b to the inside of the intermediate cylindrical body 3 against the urging force of the leaf spring 20, the locking pins 19a and 19b are It is in a state of being supported by the body 3.

In FIG. 1, reference numeral 22 denotes unlocking means for automatically unlocking the locking means 12, and reference numeral 23 denotes unlocking means for automatically unlocking the locking means 13. As shown in FIG. 2, the locking means 22 includes a gate-shaped elevating operation body 24 which is loosely fitted into the innermost cylindrical body 4 so as to be able to elevate and lower.
A bolt-operating piece 25 having a bolt head fixed to the upper end of the elevating operation body 24 and penetrating the upper end horizontal plate 10 of the innermost tubular body 4 so as to be vertically movable; and the operation piece (bolt) 25 Nut 25a screwed on the upper end side of the nut, and an operation piece (bolt) between the nut 25a and the horizontal plate 10
Spring 26 utilizing compression coil spring loosely fitted to 25
And both side plates 24a, 24 of the lifting operation body 24.
"b" is adjacent to the opposite side walls 4a, 4b provided with the through-square holes 14a, 14b of the lock means 12, and the lower end thereof is fitted and moved upward when the locking pins 15a, 15b are relatively fitted. Operating portions 28a and 28b having notched concave portions 27a and 27b. Since the thickness of the plate constituting the lifting operation body 24 is thinner than the thickness of the plate constituting the intermediate cylindrical body 3 and the outermost cylindrical body 2, both side plates of the lifting operation body 24 are required to match the thickness. Reinforcing plates 29a and 29b are attached at appropriate height regions from the lower ends of 24a and 24b.

The lock releasing means 23 is provided so that the upper inner cylindrical body (innermost cylindrical body 4) descending inside the inner cylindrical body (intermediate cylindrical body 3) is also used. At the lower end of the tubular body (innermost tubular body 4), operating portions 31a and 31b are provided with cutout recesses 30a and 30b into which the locking pins 19a and 19b are relatively fitted and moved when descending. I have.

The method of use will be described. As shown in FIGS. 1A, 1B and 2, for example, the mounting portion 5 is mounted on an H-shaped steel 32 disposed outside the ceiling of an elevator car.
Is fixed with bolts and nuts, and the multiple cylindrical body 1 (safety support column) is erected vertically. Then, as shown in FIG. 1A, when the multiple cylindrical body 1 is extended and extended, the multiple cylindrical bodies 1 are automatically locked in the extended state by the locking means 12 and 13.

That is, as shown in FIG.
Pair of locking pins 15a, 15b supported near the lower end of the
Is provided at a position near the upper end of the intermediate cylindrical body 3.
a, 17b, the pair of locking pins 15
a, 15b are automatically fitted into a pair of locking holes 17a, 17b of the intermediate cylindrical body 3 by the urging force of the leaf spring 16, and the innermost cylindrical body via the pair of locking pins 15a, 15b. 4 and the intermediate cylindrical body 3 are locked in an extended state, and a pair of locking pins 19a and 19b supported near the lower end of the intermediate cylindrical body 3 are provided near the upper end of the outermost cylindrical body 2. Lock hole 21
a, 21b, the pair of locking pins 19
a, 19b are automatically fitted into a pair of locking holes 21a, 21b of the outermost cylindrical body 2 by the urging force of the leaf spring 20, and the intermediate cylindrical body is inserted via the pair of locking pins 19a, 19b. 3 and the outermost tubular body 2 are locked in an extended state.

At this time, as shown in FIGS. 1 and 2, the operating piece (bolt) 25 of the unlocking means 22 is
The lifting operation body 24 is at the ascending limit position where the upper end thereof comes into contact with the bottom surface of the upper end horizontal plate 10 of the innermost cylindrical body 4. The lower end operating portions 28a, 28b of the lifting / lowering operating body 24 are located directly above the two leg portions 16a, 16b of the leaf spring 16 of the locking means 12.

In this state, the safety rope connected to the worker's waist and the free end carabiner to the locking hole 11 are connected to the locking member 9 at the upper end of the safety column (multiple cylindrical body 1). Or at least two safety struts (multiple cylindrical bodies 1) are erected outside the ceiling of the elevator cage as described above, and the locking members 9 at the upper ends of these safety struts are provided.
In between, the master rope is stretched by, for example, fastening both ends of the master rope to the locking holes 11 and engaging the carabiner at the free end of the safety rope with the master rope to directly prevent the fall of the worker. Alternatively, it can be prevented by the above-mentioned safety strut via a parent rope.

After use, the safety column (multiple tubular body 1) is removed. Before or after the removal, the multiple tubular body 1 can be contracted to shorten the length. That is, the operating piece (the bolt 2
When the lifting operation body 24 is lowered in the innermost cylindrical body 4 by pressing down the 5) against the spring 26, as shown in FIG. Of the leaf spring 16 so as to cut between the opposing side walls 4a, 4b of the innermost tubular body 4 outside the leg 16a, 16b.
6b is pressed and deformed inward (in a direction approaching each other).
As a result, the locking pins 15a and 15b fixed to the legs 16a and 16b of the leaf spring 16 move inward (to approach each other), and the locking holes 17a and 17a of the intermediate cylindrical body 3 are moved.
17b, the lock between the position near the lower end of the innermost tubular body 4 and the position near the upper end of the intermediate tubular body 3 is released. At this time, the locking pins 15a, 15b are provided in the cutout recesses 27a, 27b of the operation portions 28a, 28b.
Are relatively ascending. In addition, the lifting operation body 2
A pair of operating portions 28a, 28b at the lower end of the lock member 4 are connected to the locking pins 15a, 15b by the locking holes 17a, 17b
The thickness is set so as to be removed inward from the inside, but not to be removed from the through-square holes 14a and 14b of the innermost tubular body 4.

As described above, since the lock of the lock means 12 is automatically released, the operation piece (bolt) 25 is further pushed down integrally with the innermost cylindrical body 4 or the innermost cylindrical body is moved by gravity. 4 descends with respect to the intermediate tubular body 3. Then, when the pair of operating portions 31a and 31b at the lower end of the intermediate cylindrical body 3 reach the locking means 13, the pair of operating parts 31a and 31b are connected to the leaf spring 20 of the locking means 13 as shown in FIG. The two legs 20a, 20b and the outer side walls 3a, 3b of the intermediate cylindrical body 3 outside thereof are inserted so as to be interrupted, and the two legs 20a, 20b of the leaf spring 20 are inserted.
Are pressed and deformed inward (directions approaching each other). As a result, the locking pins 19a, 19b fixed to the legs 20a, 20b of the leaf spring 20 move inward (to approach each other), and the locking holes 21a, 2b of the outermost cylindrical body 2 are moved.
1b, the lock between the position near the lower end of the intermediate tubular body 3 and the position near the upper end of the outermost tubular body 2 is released. At this time, the locking pins 19a, 19b relatively rise and fit into the cutout recesses 30a, 30b of the operation portions 31a, 31b. The pair of operating portions 31a and 31b at the lower end of the intermediate cylindrical body 3 are
a and 19b are disengaged inward from the locking holes 21a and 21b of the outermost cylindrical body 2, but the through-holes 18 of the intermediate cylindrical body 3
The thickness is set so as not to be separated from a and 18b.

When the lock of the lock means 13 is automatically released as described above, the uppermost horizontal plate 1 of the innermost tubular body 4 is opened.
0 comes into contact with the upper end of the intermediate cylindrical body 3, and the innermost cylindrical body 4 is pressed down integrally with the intermediate cylindrical body 3 as it is, or is lowered by gravity, as shown in FIG. 1C. The multiple cylindrical body 1 is in a contracted state.

As described above, the operation piece (bolt) 2 is artificially used.
5 can be contracted from the extended state to the contracted state by pressing down the elevator cylinder 5. However, if the elevator cage is erroneously raised while being left on the elevator cage, the elevator Immediately before the cage reaches the ascending limit, the operation piece (bolt) 25 at the upper end of the safety column (multiple tubular body 1) collides with the ceiling surface 33 of the building located above the elevator cage, and as the elevator cage rises. As a result, the operation piece (bolt) 25 is pushed down, so that the lock of the locking means 12 is automatically released, and the innermost tubular body 4 is moved by gravity with respect to the intermediate tubular body 3 or the lift of the elevator cage. Building ceiling surface 3
It is pushed down by 3 and descends. Then, the intermediate tubular body 3 is lowered by gravity immediately before reaching the lower limit position, or is pushed down by the building ceiling surface 33 as the elevator cage rises, thereby lowering the second stage locking means 13.
Is automatically released, and the innermost tubular body 4 and the intermediate tubular body 3 are further pushed down by gravity or by the ceiling surface 33 with the rise of the elevator cage and descend to the lowermost limit, and the multiple cylinders are lowered. The state body 1 is in a contracted state. That is, the stretched multiple tubular body 1 is not crushed between the ascending elevator cage and the building ceiling surface 33 thereabove.

In the above embodiment, three cylindrical bodies 2 to 2 are used.
Although the stretchable multiple tubular body 1 composed of the four tubular members is used, the stretchable multiple tubular body 1 composed of only two tubular bodies may be used. In this case, the second-stage locking means 13 and its unlocking means 23 become unnecessary. Of course, it is also possible to use an extendable multiple tubular body composed of four or more tubular bodies. In this case, the locking means and the unlocking means in the third and lower stages can be configured based on the locking means 13 and the unlocking means 23 in the above embodiment.

Further, the configurations of the lock units 12, 13 and the lock release units 22, 23 are not limited to those of the above-described embodiment. For example, although a bolt that penetrates the upper end of the innermost tubular body 4 upward is used as the operating piece 25, an operating piece that can move up and down may be provided outside the upper end of the innermost tubular body 4. I can do it. Of course, the operation piece may have a lever structure that can swing up and down around the horizontal support shaft. Although a pair of locking pins 15a, 15b and 19a, 19b are used for the locking means 12, 13, one locking pin may be used on one side. In this case, the operation part formed at the lower end of the elevating operation body 24 or the innermost cylindrical body 4 may be formed only on the side corresponding to the locking pin, or the leaf springs 16, 20 as in the above embodiment. When attaching the locking pin to one end of the cylindrical body, the other ends of the leaf springs 16 and 20 may be fixed to the inner surface of the side wall of the tubular body. Furthermore, although the leg of the leaf spring that urges the locking pin outward is used as the operated part, the operated part may be formed directly on the inner end of the locking pin.

In the case of using an expandable and contractible multiple cylindrical body composed of three or more cylindrical bodies, between the innermost cylindrical body and the outer cylindrical body immediately below the inner cylindrical body, that is, the uppermost elastic body. Only with the locking means 12 unlocked by the operation piece 25,
Locking means which cannot be automatically unlocked using locking pins which are inserted and removed by manual operation can be used for the lower elastic portion. In this case, there is a problem if the height of the multiple tubular body when the uppermost telescopic portion is automatically unlocked and contracted is lower than the space height between the elevator cage at the ascending limit position and the ceiling of the building thereabove. There is no.

[0026]

The safety strut of the present invention can be implemented and used as described above. According to the safety strut of the present invention, it is possible to shorten the entire length of the safety strut by shortening it. As a result, the occupied space required for transport and storage is reduced, and not only can the transport and storage be performed efficiently, but also handling such as transport and installation is facilitated.

Further, an operation piece of the lock release means for contracting the safety support column protrudes upward from the upper end of the support column (multi-tubular body), and when the operation piece is pressed down, the lock of the lock means is automatically locked. So that the height of the space between the elevator cage in the ascending position and the ceiling surface of the building above it is lower than the height of the safety support column. When using the safety strut of the present invention for ensuring the safety of inspection work, even if the user has forgotten to remove the safety strut from the elevator cage after the maintenance work, the operation piece is required before the elevator cage reaches the upper limit. Is pushed down relatively on the ceiling surface of the building to automatically release the lock in the extended state of the multi-tubular body and switch to the contractible state. Or ended up crushing the safety strut between beta cage and the building the ceiling surface of the upper side, there is no possibility that the building ceiling surface or the like of the ceiling and the upper side of the elevator cage would not damage in the safety posts.

According to the configuration of the second aspect, the present invention can be implemented with a simple configuration. In this case, according to the configuration of the third aspect, the spring for urging the locking pin outward and the required portion to be operated on the side of the locking pin can be used, and the special operated portion can be used. The present invention can be implemented more easily and easily as compared with the case where the must be connected to the locking pin. Further, according to the configuration of the fourth aspect, the multiple cylindrical bodies in the extended state can be securely locked by the pair of left and right locking pins, and safety can be enhanced. Moreover, the spring for urging the pair of locking pins outward and the operated portion which must be connected to each locking pin can be constituted by a single mountain-shaped leaf spring, so that the operation is inexpensive. I can do it.

According to the fifth aspect of the present invention, not only is the structure of the operation piece simplified, but also the operation piece is unexpectedly lowered due to an excessively small upward biasing force and unlocked. The strength of the spring that urges the operation piece upward is set to the value of the operation piece in order to eliminate the possibility that it is difficult to manually push down the operation piece because the upward urging force is too strong. It can be easily adjusted by a nut screwed onto the (bolt).

Further, according to the structure of the sixth aspect, a safety pillar having a large difference between the length of the support in the extended state and the length of the support in the contracted state can be implemented. Although it is a configuration, it can be conveniently used as a safety column that can automatically release the locking means of all the expansion and contraction sections as appropriate.

[Brief description of the drawings]

1A is a front view showing a use state in which a support is extended, FIG. 1B is a plan view thereof, and FIG. 1C is a side view in a state in which the support is contracted.

FIG. 2 is a partially cut-away enlarged vertical sectional front view showing a configuration of an uppermost telescopic portion and a second telescopic portion of FIG. 1A.

FIG. 3 is a partially cutaway longitudinal front view showing a state of an uppermost telescopic portion when an operation piece is pushed down by a collision with another object.

FIG. 4A is a longitudinal sectional front view of a main part showing a state where the innermost tubular body is lowered to unlock a second-stage expansion / contraction part, and FIG. 4B is a longitudinal sectional side view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multiple cylindrical body 2 Outermost cylindrical body 3 Intermediate cylindrical body 4 Innermost cylindrical body 5 Attachment part 9 Locking device such as a safety rope 12 Uppermost locking means 13 Second locking means 14a, 14b, 18a, 18b Penetrating square holes 15a, 15b, 19a, 19b Prismatic locking pins 16, 20 Mountain-shaped leaf springs 16a, 16b, 20a, 20b Both leg portions (operated portions) 17a, 17b, 21a, 21b of the leaf spring Stop holes 22, 23 Lock release means 24 Elevating operation body 25 Operation piece (bolt) 25a Nut 26 Spring (compression coil spring) 27a, 27b, 30a, 30b Notch recess 28a, 28b, 31a, 31b Operation section

Claims (6)

[Claims] 1. A fall prevention safety strut comprising a multi-tubular body which is extendable and contractable and can be locked in an extended state, comprising: a mounting portion provided at a lower end of an outermost cylindrical body of the multi-tubular body; A lock such as a safety rope provided at the upper end of the innermost tubular body of the multiple tubular body, and automatically unlocks a locking means between the innermost tubular body and the outer tubular body immediately below the innermost tubular body. The unlocking means comprises an operating piece disposed vertically movably in a state protruding above the upper end of the innermost tubular body and urged to an upper limit position by a spring. ,
A fall-prevention safety strut, wherein the unlocking means performs an unlocking movement when the operation piece is depressed. 2. The locking means according to claim 1, wherein said locking means includes a locking pin passing through a through hole provided in a side wall of the innermost cylindrical body, a spring for urging said locking pin outward, and a locking means for the innermost cylindrical body. A lock hole provided on an adjacent outer cylindrical body, wherein the lock pin comprises a lock hole which can be fitted and disengaged, and an operated portion is continuously provided on an inner end side of the lock pin; Is provided with an elevating operation body that moves up and down in conjunction with the operation piece, and the lower end of the elevating operation body is moved downward to move the locking pin inward via the operated part to lock the lower part. The fall-prevention safety strut according to claim 1, further comprising an operation unit for detaching from the hole. 3. A spring for urging the locking pin outwardly,
One end is attached to the inner end of the locking pin and extends obliquely upward from the locking pin, and is made of a leaf spring that also serves as the operated part. 3. The fall-preventing safety strut according to claim 2, wherein the leaf spring is lowered into the space between the side wall of the tubular body on the side where the locking pin is located and presses and deforms the leaf spring inward. 4. A pair of left and right locking pins are provided, and said leaf spring is formed of a single mountain-shaped leaf spring having said locking pins attached to both outer ends thereof, respectively. At least one of the locking pins is configured to be non-rotatable with respect to the through hole, and a pair of left and right operating portions of the lifting operation body are provided so as to act on both legs of the mountain-shaped leaf spring. The safety pillar for fall prevention according to claim 3. 5. The operation piece comprises a bolt fixed to an upper end of the elevating operation body and vertically penetrating an upper end of the multiple cylindrical body, and a nut screwed on the operation piece and an upper end of the multiple cylindrical body. The fall prevention safety column according to any one of claims 1 to 4, wherein a compression coil spring as a spring for urging the operation piece upward is interposed on the operation piece. 6. A locking means for locking the inner and outer cylindrical bodies of the second or lower stage from the top in the extended state of the multiple cylindrical bodies, wherein the multiple cylindrical bodies are formed of three or more cylindrical bodies. As the lock means between the innermost tubular body and the outer tubular body immediately below the same, a lock release means for the second-stage or lower lock means is used as a lock release means for the inner tubular body. The fall-prevention safety support column according to any one of claims 1 to 5, wherein the operating portion is provided at a lower end of the upper-stage inner cylindrical body so that the upper-stage inner cylindrical body descending inward is also used. .