JP4297156B2 - Fall prevention device for ladder - Google Patents

Description

  The present invention relates to a fall prevention device for a ladder for preventing the ladder from overturning in a use state in which the ladder is leaned against an installation target such as a building roof or an established communication line. Is.

Generally, in a ladder of this type, as an apparatus for preventing a fall during use, an engagement tool that engages with an object to be installed is attached to the upper part of both sides of the ladder. Various preventive tools (means) have been devised, such as attaching wide anti-skid tools to the lower part of the ladder on both sides.
Conventionally, as means for enhancing the prevention of the fall, for example, a movable arm is rotatably attached to a side portion of the ladder at the top of the ladder, and the ladder is leaned against an installation object. A structure has been devised in which the ladder is fixed to the installation target by abutting the lower side of the installation target with the operation rope. (See Patent Document 1)
Also, a structure in which a supporting leg is attached to each side of the ladder at the lower part of the ladder, and the installation part side of the supporting leg is installed on the outside rear side of the installation point of the side fence in the ladder like an outrigger type configuration is proposed. Has been issued. (See Patent Document 2)
Japanese Patent Laid-Open No. 2003-262082 JP 2005-139812 A

However, in the above-mentioned conventional means, in the former structure, the object to be installed is almost clamped between the contact portion by the side of the standing ladder and the lower surface by the movable arm. The condition was unstable and incomplete, and the safety was not satisfied, and the operation of the movable arm was troublesome.
In the case of the latter structure, the ladder can be leaned against the installation object in a stable state to some extent by the outrigger type configuration with the support legs, but depending on the installation surface, the ladder may be rearward and laterally It was inevitable that shaking itself would occur, and it still did not satisfy the securing of its safety.
Therefore, the present invention prevents the ladder from swinging backward and laterally from the standing state with respect to the installation target, and can ensure the safety of the ladder in use as much as possible. An object of the present invention is to provide a fall prevention device for use.

The above-described problems are solved by the devices described in the claims.
The invention according to claim 1 is a base plate attached to a part of the ladder, a presser arm attached to the upper side of the base plate so as to be tiltable, and attached to the lower side of the base plate so as to be tiltable. The presser arm includes a receiving arm extending opposite to the presser arm, and the presser arm and the receiving arm are configured to be fixed so as to clamp an object to be installed from above and below the base plate. It is characterized by being.
According to this configuration, the presser arm and the receiving arm are respectively tilted with respect to the base plate mounted on the ladder and fixed in contact with the upper and lower surfaces of the installation target, and the presser arm and the receiving arm are fixed. The installation object, for example, a projecting part such as a roof eave, is securely clamped from above and below by the support arm, and the ladder leaning on the installation object is installed in a stable state without shaking in the back and left and right directions It is.

The invention according to claim 2 is the fall prevention device for the ladder according to claim 1, wherein the base plate, the presser arm and the receiving arm are arranged at a predetermined interval with respect to a part of the ladder. It is characterized by being installed in two places.
According to this configuration, in addition to the above-described first aspect, stabilization in a standing state of the ladder is further ensured.

A third aspect of the present invention is the ladder overturn prevention device according to the first or second aspect, wherein the base plate is detachably mounted on a side lamp or a footpiece constituting the ladder via a fixing tool. It is provided.
According to this configuration, in addition to the above-described claim 1 or 2, the entire fall prevention device including the base plate, the presser arm, and the receiving arm can be easily and easily handled with respect to the main body of the ladder. It corresponds easily to the mounting on the ladder.

According to a fourth aspect of the present invention, in the ladder overturn prevention device according to the first or second aspect, a bent hook portion is formed at one end of the presser arm.
According to this configuration, in addition to the above-described first or second aspect, the ladder can be easily stood on the installed communication line or the like by using the hook engagement function of the hook portion of the presser arm. Is.

  In the invention according to claim 1, in a stable state without swinging the ladder that leans against the installation object by securely holding the installation object from above and below by the presser arm and the receiving arm and leaning on the installation object. It can be installed, its fall can be prevented, and the safety of the ladder in use can be ensured as much as possible.

  According to the second aspect of the invention, in addition to the effect of the first aspect, the holding state between the presser arm and the receiving arm can be achieved at two positions on the left and right sides, so that the left and right fluctuations in the standing state of the ladder can be reliably ensured. It is possible to prevent the problem and stabilize the installation state even better.

  According to the invention described in claim 3, in addition to the effect of claim 1 or 2, the entire fall prevention device is attached to and detached from the main body of the ladder, and the handling and the like thereof are simplified and facilitated. It is possible to easily cope with mounting on various ladders.

  According to the invention described in claim 4, in addition to the effect of claim 1 or 2, the ladder can be easily connected to the communication line constructed by using the hook engaging function of the hook portion of the presser arm. It can be leaned and the range of stable use of the ladder can be expanded.

  Next, the best mode for carrying out the present invention will be described according to examples.

As shown in the figure, the fall prevention device 1 for a ladder according to the present embodiment is tilted to a base plate 2 having an L-shaped cross section having a predetermined length and one end portion (upper end portion in the figure) of the base plate 2. A flat presser arm 4 pivotally supported via a support pin 3 and a flat plate pivotally supported via a support pin 5 so as to be tiltable to the other end portion (lower end portion in the figure) of the base plate 2. The receiving arm 6 is shaped as a main body.
The fall prevention device 1 mainly composed of the base plate 2, the presser arm 4, and the receiving arm 6 is configured in the same manner and is mounted on a part of a ladder to be described later in a paired state. . Each member of the base plate 2, the presser arm 4, and the receiving arm 6 is preferably made of a material that is lightweight and excellent in rigidity and strength, for example, aluminum.

  The base plate 2 has a flat base piece as a mounting piece 2a, and the pressing arm 4 and the receiving arm 6 are connected to the both ends of the rising piece 2b from the base piece via support pins 3 and 5, respectively. In the vicinity thereof, the tilting range of the presser arm 4 and the receiving arm 6 is restricted to a desired range, and the presser arm 4 and the receiving arm 6 are secured to the base plate 2. Substantially arc-shaped first and second guide elongated holes 7 and 8 for attaching fastening means described later are respectively provided.

One end side of the presser plate 4 is configured as a free end, and a hook portion 9 bent in a substantially V shape is formed, and an outer end edge of the hook portion 9 is formed as a contact presser surface 9a. ing. Further, a linear guide elongated hole 10 is provided in a portion of the presser plate 4 corresponding to the first guide elongated hole 7, and the guide elongated hole 10 is in contact with the first guide elongated hole 7. The tightening bolt 11 constituting the tightening means inserted and inserted in a state where the removal to the one side is prevented is inserted, and the tightening wing nut 12 also constituting the tightening means is screwed into the thread portion of the tightening bolt 11. ing.
The presser plate 4 is tilted within a predetermined range via the guide long hole 10, the tightening bolt 11, and the first guide long hole 7 by loosening the tightening wing nut 11 with respect to the tightening bolt 10 in the tightening means. And is secured to the base plate 2 by tightening the tightening wing nut 12 against the tightening bolt 11 in the tightening means.
Desirably, the entire outer surface of the hook portion 9 is provided with a desired insulating means (not shown).

One end of the receiving arm 6 is configured as a free end, and the inner end edge of the substantially distal end portion is formed as a contact receiving surface 6a. A linear guide slot 13 is formed in a portion of the receiving plate 6 corresponding to the second guide slot 8, and the second guide slot 13 has a second guide length. A tightening bolt 14 constituting a tightening means inserted in a state in which removal to one side is prevented from being inserted into the hole 8 is inserted, and a tightening wing nut 15 also constituting the tightening means is inserted into a thread portion of the tightening bolt 14. Are screwed together.
Thus, the receiving plate 6 loosens the tightening wing nut 15 with respect to the tightening bolt 14 in the tightening means, thereby allowing the receiving plate 6 to pass through the guide long hole 13, the tightening bolt 14, and the second guide long hole 8 within a predetermined range. Is allowed to be tilted, and is secured to the base plate 2 by tightening the tightening wing nut 15 against the tightening bolt 14 in the tightening means.

  Mounting brackets 16 and 16 are fixed to almost both ends of the rising piece 2b of the base plate 2, and L-shaped fastening bolts 17 are provided between the mounting brackets 16 and 16 and the mounting piece 2a of the base plate 2, respectively. The screw portions at both ends of the tightening bolt 17 are passed through the mounting brackets 16 and 16 and the mounting piece 2a of the base plate 2, and tightening nuts 18 to 18 are respectively screwed together. The structure of the mounting bracket 16, the L-shaped fastening bolt 17, the fastening nut 18, and the like corresponds to the fixture in claim 3 of the present invention.

The fall prevention device 1 configured as described above is mounted entirely on the upper end portion of the ladder Y. First, the mounting piece 2a of the base plate 2 faces the side rod Y1 of the ladder Y and its upper and lower sides. The mounting bolts 16 and 16 and the mounting piece 2a of the base plate 2 are positioned so as to rotate along the outside of the side rod Y1 of the ladder Y, and the clamping bolt 17 It is firmly fixed by tightening the tightening nuts 18 to 18 which are screwed into this.
In this case, the downward movement of the ladder Y can be prevented by positioning the position of the tightening bolt 17 on the upper portion of the ladder Y2, but the opposite side edge of the rising piece 2b in the base plate 2 can be prevented. You may make it form the engaging part engaged with the crosspiece Y2 of the ladder Y, and prevent the downward movement at the time of mounting | wearing.

  Then, the ladder Y is leaned against the installation object Z, for example, the eaves of the roof, and the presser plate 4 in the overturn prevention device 1 attached to the upper end portion of the ladder Y is tilted with the support pin 3 as a fulcrum to be installed. The base plate 2 is secured by tightening the tightening wing nuts 11 against the tightening bolts 10 in the tightening means in contact with the top surface of the object Z, for example, the roof eaves.

  On the other hand, the receiving plate 6 is tilted with the support pin 5 as a fulcrum, and is tightened with respect to the tightening bolt 14 in the tightening means in contact with the installation object Z, for example, the surface of the roof eaves. By fastening 15, the base plate 2 is secured.

  The presser arm 4 and the receiving arm 6 secured to the base plate 2 hold the installation object Z, for example, the upper and lower surfaces of the roof eaves in contact with each other in the vertical direction. The ladder Y can be stood against the installation object Z, for example, a roof eave, in a stable state without swinging in the rear and left and right directions, and the fall of the ladder Y can be prevented in advance. (See Figs. 6 and 7)

When the clamping state between the presser arm 4 and the receiving arm 6 is released, the state can be released by loosening the fastening wing nuts 12 and 15 with respect to the fastening bolts 11 and 14. .
Further, when removing the entire fall prevention device 1 from the ladder Y, it can be removed by loosening the tightening nuts 18 to 18 with respect to the tightening bolt 17 and removing the tightening bolt 17 from the mounting bracket 16. Can be mounted on various ladders.

Then, the presser arm 4 is secured to the base plate 2 with the open part of the hook part 9 facing downward, and the hook engagement function of the hook part 9 of the presser arm 4 is used, for example, the installed communication It is possible to easily lean the ladder on the communication line X or the like. (See Figure 8)
In this case, by providing desired insulation means (not shown) on the entire outer surface of the hook portion 9, it is possible to ensure safety when leaning against the communication line X or the like.
The receiving arm 6 is positioned on the side of the presser arm 4 as shown by a solid line in the drawing, or is positioned in a state of hanging downward as shown by a virtual line.

  In addition, by using the fall prevention device 1 on the left and right side rods Y1 of the ladder Y (equipped as a pair of left and right) and using them as described above, it is possible to reliably prevent the horizontal fluctuation in the standing state of the ladder. As a result, the installation state can be further stabilized.

  In this embodiment, it is possible to connect the base plate 2 of the overturn prevention device 1 mounted on the left and right of the ladder Y so as to be integrated, and the base plate 2 and the presser arm 4 can be configured integrally. The configurations of the receiving arm 6 and the fixture are not limited to those shown in the drawings, and various modifications can be made without departing from the gist of the present invention.

  It is a front view of the whole fall prevention apparatus which shows the form of one Example.   It is a side view of the whole fall prevention apparatus similarly.   It is the sectional view on the AA line of FIG.   It is the BB sectional view taken on the line of FIG.   It is CC sectional view taken on the line of FIG.   It is a perspective view which shows the state which mounted | wore the ladder with the fall prevention apparatus, and its use condition.   It is a front view which similarly shows the state which mounted | wore the ladder with the fall prevention apparatus, and its use condition.   It is a front surface which shows another use condition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fall prevention device 2 Base plate 4 Presser arm 6 Receiving arm 9 Hook part Y Ladder

Claims (4)

  A base plate mounted on a part of the ladder, a presser arm attached to the upper side of the base plate so as to be tiltable, and attached to a lower side of the base plate so as to be tiltable, and extends in a direction opposite to the presser arm. The holding arm and the receiving arm are configured to be fixed so as to clamp the object to be installed from above and below with respect to the base plate. Fall prevention device for ladder.   The ladder overturn prevention device according to claim 1, wherein the base plate, the presser arm, and the receiving arm are installed at two left and right positions with a predetermined interval with respect to a part of the ladder. A fall-prevention device for ladders.   The fall prevention device for a ladder according to claim 1 or 2, characterized in that the base plate is detachably mounted on a side fence or a traverse beam constituting the ladder via a fixing tool. Fall prevention device for ladder   The ladder overturn prevention device according to claim 1 or 2, wherein a bent hook portion is formed at one end of the presser arm.

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