JP2017218764A - Ladder fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ladder fixing device capable of fixing a ladder to a columnar body of extending in the vertical direction.SOLUTION: A ladder fixing device 1 comprises an installation part 10 installed in a ladder 100 and a pair of arms 31 and 32 mutually separately arranged in the ladder width direction being the opposed direction in one and the other of a pair of columns 110 of the ladder 100. The pair of arms 31 and 32 are constituted so that the approach movement for mutually approaching in the ladder width direction and the separation movement for mutually separating in the ladder width direction, become possible. The pair of arms 31 and 32 sandwich a wiring column P being a columnar body of extending in the vertical direction in the ladder width direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ladder fixing device that fixes a ladder.

  As an apparatus for preventing the ladder from toppling over, a device described in Patent Document 1 is known. The apparatus includes a plurality of arms. Each arm is configured so that the eaves of the building can be clamped in the vertical direction. According to such an apparatus described in Patent Document 1, it is possible to fix a ladder leaning against the eaves of a building to the eaves and prevent the fall.

JP 2008-174914 A

  However, it is difficult to use the ladder to which the device described in Patent Document 1 is leaned on a pillar such as a railway overhead pole arranged on the side of the track, a telegraph pole arranged on the side of the road, or a tree. is there. That is, since the apparatus described in Patent Document 1 cannot hold such a columnar body between arms, the ladder cannot be fixed to the columnar body.

  This invention is made | formed in view of such a subject, The objective is to provide the ladder fixing apparatus which can fix a ladder with respect to the columnar body extended in a perpendicular direction.

  In order to solve the above-described problems, a ladder fixing device according to the present invention is arranged to be separated from each other in an attachment portion attached to the ladder and a ladder width direction that is a direction from one of the pair of ladders to the other. A pair of arms. The pair of arms is configured to be able to perform an approaching movement that approaches each other in the ladder width direction and a separation movement that is separated from each other in the ladder width direction, and sandwiches a columnar body extending in the vertical direction in the ladder width direction.

  According to this configuration, the pair of arms can sandwich columnar bodies of various thicknesses in the ladder width direction. Even if the ladder tries to move in the ladder width direction from the state where the ladder is leaned against the columnar body, the movement is suppressed by the arm. As a result, the ladder can be fixed to the columnar body.

  In addition, the ladder fixing device may include a contact portion disposed between the pair of arms, and the pair of arms may be moved close to each other when a force acts on the contact portion. Good. According to this configuration, when the ladder to which the ladder fixing device is attached is leaned against the columnar body, the contact portion can be brought into contact with the columnar body that enters between the pair of arms. Furthermore, by pressing the ladder toward the columnar body, a force can be applied to the contact portion, and the pair of arms can be moved closer to each other. That is, according to this configuration, the pair of arms sandwich the columnar body as the ladder is leaned against the columnar body, so that the ladder can be easily fixed to the columnar body.

  Moreover, the ladder fixing device may include a ratchet mechanism that does not prevent the pair of arms from moving close to each other while preventing the pair of arms from moving apart. According to this configuration, the pair of arms sandwiching the columnar body are prevented from moving apart, so that the ladder can be reliably fixed to the columnar body.

  The ladder fixing device may include an operation member extending from the ratchet mechanism, and the ratchet mechanism may allow the pair of arms to move apart based on the operation member being operated. According to this configuration, the worker who has finished using the ladder can release the holding by the pair of arms by operating the operation member after getting off the ladder.

  ADVANTAGE OF THE INVENTION According to this invention, the ladder fixing apparatus which can fix a ladder with respect to the columnar body extended in a perpendicular direction can be provided.

It is a perspective view which shows the ladder fixing device attached to the ladder. It is sectional drawing in the II-II cross section of FIG. It is a top view which shows the ladder fixing device at the time of starting fixation to an overhead wire pillar. It is a top view which shows the ladder fixing apparatus which the fixation to an overhead wire pillar was completed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  First, an outline of a ladder fixing device 1 (hereinafter simply referred to as “fixing device 1”) according to the embodiment will be described with reference to FIG. FIG. 1 is a perspective view showing a fixing device 1 attached to a ladder 100.

  The ladder 100 is a device that moves up and down for an operator to work at a high place. The ladder 100 includes a pair of support columns 110 and a plurality of step bars 120. The pair of struts 110 are disposed so as to face each other (hereinafter, a direction in which the struts 110 face each other is referred to as a “ladder width direction”). The plurality of step bars 120 extend in the ladder width direction between the pair of columns 110, and both ends thereof are fixed to the columns 110. The plurality of step bars 120 are arranged at intervals in the direction in which the pair of support columns 110 extend.

  The ladder 100 is used by grounding the lower ends of the pair of support columns 110 and bringing the upper ends into contact with the structure. The fixing device 1 is attached to the end of such a ladder 100. When the ladder 100 is used, the ladder 100 is arranged such that an end portion of the ladder 100 to which the fixing device 1 is attached becomes an upper end portion.

  The fixing device 1 includes a pair of arms 31 and 32 as described later. When the ladder 100 is used while leaning on the overhead pole P, the fixing device 1 holds the overhead pole P between the arms 31 and 32. The overhead pole P is an example of a columnar body extending in the vertical direction. Thus, the ladder 100 is fixed with respect to the overhead pole P by the fixing device 1 holding the overhead pole P.

  Here, the form of the ladder to which the fixing device 1 is attached is not limited as long as it is used by leaning against the structure. That is, the fixing device 1 can be attached to various types of ladders, such as a ladder that also serves as a stepladder, or a double ladder in which a plurality of ladders are slidably connected.

  Next, the configuration of the fixing device 1 will be described with reference to FIG. 2 together with FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  As shown in FIG. 2, the fixing device 1 includes a mounting portion 10, arms 31 and 32, and a ratchet mechanism 50. Further, as shown in FIG. 1, the fixing device 1 includes an operation member 70.

  The attachment part 10 is a part attached to the ladder 100. The attachment portion 10 is attached to each of the pair of support columns 110. The mounting portion 10 includes an inner plate 11 and an outer plate 12. The inner plate 11 and the outer plate 12 are disposed so as to face each other with the column 110 interposed therebetween in the column width direction. The inner plate 11 and the outer plate 12 are attached so as not to move with respect to the support 110 by being fastened using a plurality of bolts 91.

  The arms 31 and 32 are rod-shaped members extending from the attachment portion 10 side. The arms 31 and 32 are formed by processing a metal tubular member. Specifically, the arms 31 and 32 are formed by crushing the tubular member at the tip portions 31a and 32a and the base portions 31b and 32b and welding the tube walls. In addition, the arms 31 and 32 are formed with bending portions 31c and 32c in part by bending the tubular member.

  The ratchet mechanism 50 is a member disposed between the arms 31 and 32. As shown in FIG. 1, the ratchet mechanism 50 includes a first rotating body 51, a second rotating body 52, and a mechanism portion 53.

  The first rotating body 51 and the second rotating body 52 are both metal members formed in a disk shape. The first rotating body 51 and the second rotating body 52 are arranged so as to be substantially parallel to each other at a predetermined interval, and a bolt 95 passes through the center of each.

  The mechanism unit 53 is disposed between the first rotating body 51 and the second rotating body 52. The mechanism portion 53 has a gear and a pawl (not shown) therein. The gear has a plurality of teeth formed at a predetermined pitch on the outer peripheral surface thereof. The pawl is located on the side of the outer peripheral surface of the gear and engages one tooth of the gear.

  When the first rotating body 51 and the second rotating body 52 rotate in the first direction relative to the bolt 95, the gear rotates without engaging with the pawl. On the other hand, when the first rotating body 51 and the second rotating body 52 try to rotate in the second direction that is opposite to the first direction, the gears and the pawls engage with each other to prevent the rotation.

  As shown in FIG. 1, the operation member 70 includes a wire 71 and a grip portion 72. The wire 71 is a steel cord made by combining a plurality of wires. One end of the wire 71 is connected to the ratchet mechanism 50. The grip portion 72 is a portion that is gripped by the operator, and is connected to the other end of the wire 71.

  As described above, the ratchet mechanism 50 is prevented from rotating by the engagement between the gear and the pawl even if the first rotating body 51 and the second rotating body 52 try to rotate in the second direction relatively. However, the first rotating body 51 and the second rotating body 52 can be rotated in the second direction only when the operation member 70 is operated by the operator. Specifically, when the operator pulls the grip portion 72, the force is transmitted to the ratchet mechanism 50 via the wire 71, and the engagement between the gear and the pawl is released.

  As shown in FIG. 2, the aforementioned outer plate 12 is formed so that a part thereof is folded between a pair of support columns 110. A bar 21 extending in the ladder width direction passes through the folded portion of the outer plate 12. A plate-shaped first plate 22 and second plate 23 are fixed to the rod body 21.

  One end of the connection plate 24 is connected to the end of the first plate 22 by a bolt 92. The connecting plate 24 can rotate around the bolt 92.

  The other end of the connecting plate 24 is connected to one end of the arm fixing plate 41 by a bolt 93. The arm fixing plate 41 can rotate around the bolt 93. The arm fixing plate 41 has a bent plate shape, and the other end is fixed to the first rotating body 51 of the ratchet mechanism 40. A torsion spring 42 a is disposed between one end of the arm fixing plate 41 and the other end of the connecting plate 24.

  One end of the arm fixing plate 42 is connected to the end of the second plate 23 by a bolt 94. The arm fixing plate 42 can rotate around a bolt 94. The arm fixing plate 42 has a bent plate shape, and the other end is fixed to the second rotating body 52 of the ratchet mechanism 40. A torsion spring 42 b is disposed between one end of the arm fixing plate 42 and the end of the second plate 23.

  The base portion 31 b of the arm 31 is fixed to one end of the arm fixing plate 41. The root portion 32 b of the arm 32 is fixed to one end of the arm fixing plate 42. As a result, the arm 31 can rotate around the bolt 93, and the arm 32 can rotate around the bolt 94.

  With the rotation, the arms 31 and 32 can perform an approaching movement and a separating movement. The approaching movement is a movement in which the arms 31 and 32 approach each other in the ladder width direction, as indicated by arrows A11 and A12. The separation movement is movement in which the arms 31 and 32 are separated from each other in the ladder width direction as indicated by arrows A21 and A22.

  When the arms 31 and 32 move closer, the first rotating body 51 and the second rotating body 52 of the ratchet mechanism 50 to which the arm fixing plates 41 and 42 are connected relatively rotate in the first direction described above. . That is, since the gear in the mechanism part 53 and a pawl do not engage, rotation of the 1st rotary body 51 and the 2nd rotary body 52 is not prevented. As a result, the approaching movement of the arms 31 and 32 is not hindered by the ratchet mechanism 50.

  On the other hand, when the arms 31 and 32 try to move away from each other, the first rotating body 51 and the second rotating body 52 of the ratchet mechanism 50 relatively rotate in the second direction described above. That is, since the gear in the mechanism part 53 and the pawl engage with each other, the rotation of the first rotating body 51 and the second rotating body 52 is hindered. As a result, the separation movement of the arms 31 and 32 is hindered by the ratchet mechanism 50.

  The aforementioned torsion springs 42a and 42b urge the arms 31 and 32 via the arm fixing plates 41 and 42, respectively. Specifically, the torsion spring 42a biases the arm 31 in the direction indicated by the arrow A3. The torsion spring 42b biases the arm 32 in the direction indicated by the arrow A4. As a result, the arms 31 and 32 receive a reaction force that prevents the separation movement from the ratchet mechanism 50 while being urged in the direction of separation movement. As a result, the arms 31 and 32 can stop at a predetermined pitch angle centered on the bolts 93 and 94. The pitch angle corresponds to the gear tooth pitch of the ratchet mechanism 50.

  Next, with reference to FIGS. 3 and 4, an operation for fixing the ladder 100 to the overhead pole P will be described. FIG. 3 is a top view showing the ladder fixing device 1 when the fixing to the overhead pole P is started. FIG. 4 is a top view showing the ladder fixing device that has been fixed to the overhead pole P. FIG. 3 and 4 show the fixing device 1 at a position corresponding to the III-III cross section of FIG.

  First, as shown in FIG. 3, the worker causes the overhead pole P to enter between the opened arms 31 and 32. Thereby, the ratchet mechanism 50 arrange | positioned between the arms 31 and 32 contact | abuts the side surface of the overhead wire pillar P. FIG. That is, in this embodiment, the ratchet mechanism 50 also serves as the contact portion of the present invention.

  Next, the operator pushes the ladder 100 toward the overhead pole P as shown by the arrow R in a state where the ratchet mechanism 50 is in contact with the overhead pole P. As a result, the fixing device 1 receives a reaction force from the overhead pole P in the ratchet mechanism 50 as indicated by the arrow F. The ratchet mechanism 50 that has received the reaction force moves toward the rod 21, and the overhead pole P enters further between the arms 31 and 32.

  When the ratchet mechanism 50 moves to the rod body 21 side, the first rotating body 51 and the second rotating body 52 of the ratchet mechanism 50 relatively rotate in the first direction described above. As the first rotating body 51 rotates, the arm 31 connected to the first rotating body 51 via the arm fixing plate 41 also rotates around the bolt 93 as indicated by an arrow A5. Further, the connecting plate 24 connected to the arm fixing plate 41 by the bolt 93 rotates around the bolt 92 as indicated by an arrow A6.

  Further, as the second rotating body 52 of the ratchet mechanism 50 rotates, the arm 32 connected to the second rotating body 52 via the arm fixing plate 42 also has the bolt 94 as the center as indicated by an arrow A7. Rotate.

  The rotating arms 31 and 32 move closer as indicated by arrows A13 and A14. That is, as the overhead pole P enters between the arms 31 and 32, the arms 31 and 32 approach the side surface of the overhead pole P.

  The approaching movement of the arms 31 and 32 is completed when the arms 31 and 32 come into contact with the side surface of the overhead pole P as shown in FIG. Thereby, the overhead wire column P is sandwiched between the curved portion 31c of the arm 31 and the curved portion 32c of the arm 32 in the ladder width direction, and the operation of fixing the ladder 100 to the overhead wire column P is completed.

  At this time, the distance between the tip 31 a of the arm 31 and the tip 32 a of the arm 32 is smaller than the diameter of the overhead pole P. Further, as described above, the arms 31 and 32 are prevented from moving apart by the ratchet mechanism 50. Therefore, the overhead pole P does not unexpectedly leave between the arms 31 and 32.

  The worker who has finished using the ladder 100 pulls the grip portion 72 of the operation member 70 described above downward. As a result, the engagement between the gear of the ratchet mechanism 50 and the pawl is released, and the arms 31 and 32 biased by the torsion springs 42a and 42b move away. As a result, the holding by the arms 31 and 32 is released, and the fixing device 1 can be separated from the overhead wire pillar P.

  According to such a configuration of the fixing device 1, the pair of arms 31 and 32 can sandwich columnar bodies having various thicknesses in the ladder width direction. Even if the ladder 100 attempts to move in the ladder width direction from the state where the ladder 100 is leaned against the columnar body, the movement is suppressed by the arms 31 and 32. As a result, the ladder 100 can be fixed to the columnar body.

  Further, the fixing device 1 includes a ratchet mechanism 50 that is a contact portion disposed between the pair of arms 31 and 32. The fixing device 1 is configured such that the pair of arms 31 and 32 move closer together as a force acts on the ratchet mechanism 50. According to this configuration, when the ladder 100 to which the fixing device 1 is attached is leaned against the columnar body, the ratchet mechanism 50 can be brought into contact with the columnar body that enters between the pair of arms 31 and 32. Further, by pressing the ladder 100 toward the columnar body, a force is applied to the ratchet mechanism 50, and the pair of arms 31 and 32 can be moved closer to each other. In other words, according to this configuration, the pair of arms 31 and 32 sandwich the columnar body as the ladder 100 is leaned against the columnar body, so that the ladder 100 can be easily fixed to the columnar body. Become.

  Moreover, the fixing device 1 includes a ratchet mechanism 50 that does not prevent the approaching movement of the pair of arms 31 and 32 but prevents the separation movement. According to this configuration, the separation movement of the pair of arms 31 and 32 holding the columnar body is hindered, so that the ladder 100 can be reliably fixed to the columnar body.

  In addition, the fixing device 1 includes an operation member 70 extending from the ratchet mechanism 50. The ratchet mechanism 50 enables the pair of arms 31 and 32 to move away based on the operation member 70 being operated. According to this configuration, an operator who has finished using the ladder 100 can release the holding by the pair of arms 31 and 32 by operating the operation member 70 after getting off the ladder 100.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. Each element included in each of the specific examples described above and their arrangement, material, condition, shape, size, and the like are not limited to those illustrated, and can be changed as appropriate.

1: Ladder fixing device 10: Mounting portion 31, 32: Arm 50: Ratchet mechanism 70: Operation member 100: Ladder 110: Post P: Overhead pole (columnar body)

Claims (4)

A ladder fixing device for fixing a ladder,
An attachment portion attached to the ladder;
A pair of arms disposed apart from each other in the ladder width direction, which is a direction in which one and the other of the pair of struts of the ladder face each other,
The pair of arms is configured to be able to perform an approaching movement that approaches each other in the ladder width direction and a separation movement that is separated from each other in the ladder width direction, and holds a columnar body extending in the vertical direction in the ladder width direction. A ladder fixing device characterized by that. A contact portion disposed between the pair of arms;
The ladder fixing device according to claim 1, wherein the pair of arms perform the approaching movement in accordance with a force acting on the contact portion.   The ladder fixing device according to claim 2, further comprising a ratchet mechanism that does not prevent the approaching movement of the pair of arms and prevents the separation movement. An operation member extending from the ratchet mechanism;
The ladder fixing device according to claim 3, wherein the ratchet mechanism enables the pair of arms to move apart based on the operation member being operated.

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