JP2006247173A - Fire engine with extensible ladder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire engine with an extensible ladder which has improved attaching structure of a wire pulley and has suppressed manufacturing costs. <P>SOLUTION: The fire engine 30 with the extensible ladder is provided with an extending wire and a contracting wire. Each wire is hooked around a pulley 55 etc. The pulley 55 etc. is fixed to an oblique skeleton 80 through a positioning mechanism 70. The positioning mechanism 70 has: an attaching boss 78; an attaching shaft 75 of a holding implement 72 for supporting the pulley main body 71; and a positioning ring 79. The attaching shaft 75 is provided with a groove 76 in an axial direction. The positioning ring 79 is fixed to the end face of the attaching boss 78. A projecting piece is formed on the inner peripheral surface of the positioning ring 79. In such a state that the attaching shaft 75 is inserted into the attaching boss 78 and the positioning ring 79, the projecting piece is fitted into the groove 76. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a fire engine equipped with a ladder to be expanded and contracted.

  In general, a telescopic ladder mounted on a fire engine has a plurality of ladder bodies combined in a nested manner, and is stretched in the longitudinal direction by a telescopic device (see, for example, Patent Document 1). FIG. 9 is a diagram schematically showing the structure of this telescopic device. As shown in the figure, the telescopic device 1 includes an telescopic cylinder 2, stretched wires 3-6, and contracted wires 7-10. This telescopic ladder has a five-unit structure and includes ladder main bodies 11 to 15. The ladder main bodies 11 to 15 are combined in a nested manner, and adjacent ladder main bodies slide relatively in the longitudinal direction.

  The telescopic cylinder 2 is disposed on the lower surface of the ladder body 11, and the cylinder rod slides in the longitudinal direction of the ladder body 11. When the telescopic cylinder 2 is extended, the extension wire 3 is pulled and the ladder body 12 is extended with respect to the ladder body 11. The extension wire 4 is wound around a wire pulley 16 provided at the tip of the ladder body 12, and both ends thereof are connected to the tip of the ladder body 11 and the rear end of the ladder body 13. Therefore, when the ladder main body 12 extends, the extension wire 4 is pulled, and the ladder main body 13 extends with respect to the ladder main body 12. Further, the stretcher wire 5 is wound around a wire pulley 17 provided at the front end portion of the ladder main body 13, and both ends thereof are connected to the front end portion of the ladder main body 12 and the rear end portion of the ladder main body 14. Therefore, when the ladder main body 13 extends, the extension wire 5 is pulled, and the ladder main body 14 extends with respect to the ladder main body 13. The extension wire 6 is wound around a wire pulley 18 provided at the tip of the ladder body 14, and both ends thereof are connected to the tip of the ladder body 13 and the rear end of the ladder body 15. Therefore, when the ladder main body 14 extends, the extension wire 5 is pulled, and the ladder main body 15 extends relative to the ladder main body 14.

  Similarly, when the telescopic cylinder 2 is contracted, the contracting wire 7 is pulled, and the ladder body 12 is contracted with respect to the ladder body 11. Further, the contracted wire 8 is wound around a wire pulley 19 provided at the rear end portion of the ladder main body 12, and both ends thereof are connected to the front end portion of the ladder main body 11 and the rear end portion of the ladder main body 13. Therefore, when the ladder body 12 is shortened, the contraction wire 8 is pulled, and the ladder body 13 is shortened with respect to the ladder body 12. Further, the contracted wire 9 is wound around a wire pulley 20 provided at the rear end portion of the ladder main body 13, and both ends thereof are connected to the front end portion of the ladder main body 12 and the rear end portion of the ladder main body 14. Therefore, when the ladder body 13 is shortened, the contracted wire 9 is pulled, and the ladder body 14 is shortened with respect to the ladder body 13. The contracted wire 10 is wound around a wire pulley 21 provided at the rear end portion of the ladder main body 14, and both ends thereof are connected to the tip end portion of the ladder main body 13 and the rear end portion of the ladder main body 15. Therefore, when the ladder main body 14 is shortened, the contracted wire 10 is pulled and the ladder main body 15 is shortened with respect to the ladder main body 14.

  FIG. 10 is an enlarged front view of the wire pulley 16, and FIG. 11 is an enlarged side view. As shown in these drawings, the wire pulley 16 is attached to the scaphoid 23 via a bracket 22. The bracket 22 includes a cylindrical boss 24. A pulley body 25 of the wire pulley 16 is rotatably held by a holder 26. The holder 26 includes a fixed shaft 27, and the fixed shaft 27 is fitted into the boss 24. The fixed shaft 27 is positioned and fixed to the boss 24 via a key 28. As a result, the pulley body 25 is inclined by a predetermined angle with respect to the oblique bone 23, and the extension wire 4 is stretched between the ladder body 11 and the ladder body 13. The wire pulleys 17 to 21 have the same structure.

JP-A-11-342221

  By the way, in the said wire pulley 16, since the said fixed shaft 27 was attached to the boss | hub 24 provided in the oblique bone 23 side via the key 28, the attachment structure was complicated. That is, key grooves must be machined in the boss 24 and the fixed shaft 27, and a key 28 must be fitted in these key grooves. However, there is a problem that the cost of processing the key groove on the boss 24 is particularly high, and as a result, the manufacturing cost of the telescopic ladder and the manufacturing cost of the fire engine with the telescopic ladder increase.

  Accordingly, an object of the present invention is to provide a fire engine with a telescopic ladder whose manufacturing cost is suppressed by improving the wire pulley mounting structure.

  In order to achieve the above object, a fire engine with a telescopic ladder according to the present invention is positioned and fixed to a predetermined part of one ladder main body via a positioning mechanism and a telescopic ladder in which a plurality of ladder main bodies are combined in a nested manner. A wire pulley and a ladder that is wound around the wire pulley, one end of which is connected to a predetermined portion of the ladder main body arranged outside the one ladder main body, and the other end arranged inside the one ladder main body It is a fire engine with a telescopic ladder mounted with a ladder telescopic device having a wire connected to a predetermined part of the main body. The positioning mechanism is provided on an attachment shaft provided on the wire pulley, a cylindrical attachment boss through which the attachment shaft is inserted, provided on a predetermined portion of the ladder main body, the attachment boss, And a positioning ring through which the mounting shaft is inserted. The positioning ring includes an engaging claw that engages with an engaging groove provided on the mounting shaft.

  According to this configuration, the extendable ladder is expanded and contracted by the ladder extender. At this time, a wire pulley is provided at a predetermined portion of one ladder body among the plurality of ladder bodies combined in a nested manner, and a wire is hung on the wire pulley. Since one end of this wire is connected to a ladder body arranged outside the one ladder body, and the other end is connected to a ladder body arranged inside the one ladder body, the one ladder body When the slider body slides relative to the ladder body arranged outside the one ladder body, the ladder body arranged inside the one ladder body is pulled by the wire, It slides relative to it. In this way, each ladder body expands and contracts.

  The wire pulley is positioned and fixed to a predetermined portion of the one ladder body by a positioning mechanism. Specifically, an attachment shaft of a wire pulley is inserted into an attachment boss provided at a predetermined portion of the one ladder body, and the attachment shaft is positioned by a positioning ring provided on the attachment boss. At this time, the engaging claw of the positioning ring is engaged with the engaging groove provided on the mounting shaft, and the mounting shaft is restricted from rotating around the axial direction.

  The wire pulley may be configured to include a pulley body around which the wire is wound, and a holder that holds the pulley body and is provided with the attachment shaft. The engaging groove is provided on the outer peripheral surface of the mounting shaft so as to extend in the axial direction, and the engaging claw is constituted by a projecting piece protruding radially inward on the inner peripheral surface of the positioning ring. Is preferred. This is because in this configuration, the engagement groove and the projecting piece can be easily processed.

  According to the present invention, since the wire pulley is positioned and fixed by the positioning ring, there is no need to process a keyway on the inner wall surface of the mounting boss as in the prior art. Therefore, the wire pulley is simple with respect to the ladder body. It is positioned inexpensively with a simple structure. As a result, a fire engine with a telescopic ladder with reduced manufacturing costs can be provided.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a side view (fitting diagram) of a fire engine 30 with a telescopic ladder (an aerial work vehicle) according to an embodiment of the present invention. The fire truck 30 with an extendable ladder includes a vehicle body 31, an extendable ladder 32 mounted on the vehicle body 31, and a basket 33 provided at the tip of the extendable ladder 32.

  The vehicle body 31 includes a chassis 34 having a frame, an engine and a drive device and a body 35 mounted on the frame, a boom support device 36 and a boom hoisting device 37 that are attached to the chassis 34 via a subframe, and a subframe. And a boom support device 36, and a turning device 38 for turning the boom support device 36. The vehicle main body 31 has a known configuration. The telescopic ladder 32 is supported by a boom support device 36 via a ladder frame 40. The boom hoisting device 37 includes a hoisting cylinder 41, and the hoisting cylinder 41 erects around the hoisting central axis 42 as the hoisting cylinder 41 expands and contracts. That is, the telescopic ladder 32 is raised and lowered. Note that the undulation angle of the telescopic ladder 32 is set by setting the stroke of the undulation cylinder 41 to a predetermined dimension. The basket 33 also has a known structure. The basket 33 is attached to the tip of the telescopic ladder 32. This basket 33 is used for disaster relief activities and fire fighting activities at a fire site.

  FIG. 2 is an exploded view of the telescopic ladder 32. As shown in the figure, the telescopic ladder 32 includes four ladders 44 to 47 (ladder body), and each of the ladders 44 to 47 is assembled in a known manner. In the present embodiment, the telescopic ladder 32 includes a four-stage knitting having four ladders, but the number of the ladders constituting the telescopic ladder 32 is not particularly limited. That is, the telescopic ladder 32 has a fourth-stage ladder 44 fixed to the ladder frame 40 and third-stage ladders 45 to first-stage ladder 47 that are sequentially overlapped thereon. Each of the ladders 44 to 47 has a C-shaped cross section, and has a substantially similar shape. The third stage ladder 45 is fitted inside the fourth stage ladder 44, and the second stage ladder 46 is fitted inside the third stage ladder 45. Similarly, the first stage ladder 47 is fitted inside the second stage ladder 46. The first-stage ladder 47 to the third-stage ladder 45 can slide in the longitudinal direction with respect to the second-stage ladder 46 to the fourth-stage ladder 44, respectively.

  The telescopic ladder 32 includes a telescopic device 49. The expansion device 49 is also a known configuration, and includes an expansion cylinder 50, a plurality of pulleys, and a plurality of wires. Specifically, the telescopic cylinder 50 is attached to the lower surface of the fourth stage ladder 44. The telescopic cylinder 50 is telescopic. A movable pulley 51 is provided at the tip of the telescopic cylinder 50, and the movable pulley 51 moves along the fourth stage ladder 44 as the telescopic cylinder 50 expands and contracts. The extension wire 52 is wound around pulleys 53 provided at the front end and the rear end of the fourth stage ladder 44, and is fixed to the front end of the ladder frame 40 and the rear end of the third stage ladder 45. The drawing wire 52 is also wound around the movable pulley 51, and the movable pulley 51 functions as a so-called moving pulley.

  The extension wire 54 is wound around a pulley 55 provided at the tip of the third stage ladder 45 and is fixed to the tip of the fourth stage ladder 44 and the rear end of the second stage ladder 46. The extension wire 56 is wound around a pulley 57 provided at the tip of the second stage ladder 46, and is fixed to the tip of the third stage ladder 45 and the rear end of the first stage ladder 47.

  Therefore, when the telescopic cylinder 50 is extended, the extension wire 52 is pulled and the third stage ladder 45 slides to the left in the figure with respect to the fourth stage ladder 44. When the third stage ladder 45 slides, the extension wire 54 is pulled, and the second stage ladder 46 slides to the left in the drawing with respect to the third stage ladder 45. Further, when the second stage ladder 46 slides, the extension wire 56 is pulled, and the first stage ladder 47 slides to the left in the drawing with respect to the second stage ladder 46. That is, the telescopic ladder 32 extends.

  The crimping wire 60 is fixed to the tip of the fourth stage ladder 44 and the tip of the third stage ladder 45. The contraction wire 60 is also wound around the movable pulley 51, and the movable pulley 51 functions as a so-called moving pulley.

  The contraction wire 62 is wound around a pulley 63 provided at the rear end of the third stage ladder 45, and is fixed to the front end portion of the fourth stage ladder 44 and the rear end portion of the second stage ladder 46. The contraction wire 64 is looped around a pulley 65 provided at the rear end of the second stage ladder 46, and is fixed to the front end portion of the third stage ladder 45 and the rear end portion of the first stage ladder 47.

  Therefore, when the telescopic cylinder 50 is shortened, the contraction wire 60 is pulled and the third stage ladder 45 slides to the right in the drawing with respect to the fourth stage ladder 44. When the third stage ladder 45 slides, the contraction wire 62 is pulled, and the second stage ladder 46 slides to the right in the drawing with respect to the third stage ladder 45. Further, when the second stage ladder 46 slides, the contraction wire 64 is pulled, and the first stage ladder 47 slides to the right in the drawing with respect to the second stage ladder 46. That is, the telescopic ladder 32 is shortened.

  The feature of this embodiment is the structure of the pulleys 55 and 57 and the pulleys 63 and 65. The pulleys 55, 57, 63, and 65 (wire pulleys) are a positioning mechanism 70 described later. It is the point fixed to the 3rd stage ladder 45 and the 2nd stage ladder 46 via.

  FIG. 3 is an enlarged front view of the pulley 55, and FIG. 4 is an enlarged side view. As shown in these drawings, the pulley 55 includes a pulley body 71 and a holder 72 that holds the pulley body 71. And the said positioning mechanism 70 inclines the pulley main body 71 with respect to the 3rd step ladder 45, as FIG. As a result, one end of the extension wire 54 wound around the pulley body 71 is connected to the front end of the fourth stage ladder 44 (ladder body disposed outside the third stage ladder 45) and the other end. Is coupled to the rear end of the second stage ladder 46 (the ladder body disposed inside the third stage ladder 45).

  The holder 72 has a pair of clamping plates 73 and 74 that clamp the pulley body 71 and a mounting shaft 75 that is continuous with the rear ends of the clamping plates 73 and 74. The clamping plates 73 and 74 are provided with pins 77, and both ends of the pins 77 are supported by the clamping plates 73 and 74. The pin 77 passes through the center of the pulley body 71, whereby the pulley body 71 is rotatably supported by the pin 77. The mounting shaft 75 is composed of a round bar. Although the attachment shaft 75 is not shown, a screw is formed on the outer peripheral surface thereof. A groove 76 (engagement groove) is provided on the outer peripheral surface of the mounting shaft 75 along the axial direction. The groove 76 is formed along the axial direction from the rear end of the mounting shaft 75.

  The positioning mechanism 70 includes the mounting shaft 75, a mounting boss 78 provided at the tip of the third stage ladder 45 (one ladder body), and a positioning ring 79. 5 and 6 are a front view and an enlarged side view of the mounting boss 78, respectively. 7 and 8 are a front view and an enlarged side view of the positioning ring 79, respectively.

  As shown in FIGS. 5 and 6, the mounting boss 78 is formed in a cylindrical shape. In this embodiment, the mounting boss 78 is made of a block-like member having a rectangular cross section, and a circular through hole 82 is formed through the center of the mounting boss 78 along the axial direction. The inner diameter dimension of the through hole 82 corresponds to the outer dimension of the mounting shaft 75, and the mounting shaft 75 is exactly inserted into the mounting boss 78. As shown in FIG. 3, the mounting boss 78 is fixed to an oblique bone 80 disposed at the tip of the ladder 45. In the present embodiment, a reinforcing member 81 is provided to reinforce the oblique bone 80. However, the reinforcing member 81 may be omitted.

  Moreover, as FIG.7 and FIG.8 shows, the positioning ring 79 consists of a circular thin plate, and the through-hole 83 is provided in the center. The thickness dimension of the positioning ring 79 can be appropriately set within a range of 1.0 mm to 20.0 mm. A protruding piece 84 (engaging claw) is formed on the inner peripheral surface 85 of the positioning ring 79. The protrusion 84 is formed on the inner peripheral surface 85 so as to protrude inward in the radial direction. The projecting piece 84 is formed in a substantially rectangular shape in the present embodiment, but may have another shape. As will be described later, the projecting piece 84 is fitted in a groove 76 (see FIG. 3) provided in the mounting shaft 75. Therefore, it is preferable that the projecting piece 84 has an outer shape corresponding to the inner peripheral surface shape of the groove 76.

  As shown in FIGS. 3 and 4, the attachment shaft 75 of the holder 72 that supports the pulley body 71 is inserted through the through hole 82 of the attachment boss 78. The positioning ring 79 is disposed on the front end surface of the mounting boss 78. In this embodiment, two positioning rings 79 are provided, and these are fixed to the front end surface of the mounting boss 78 by, for example, welding. Note that the number of positioning rings 79 is not limited to two, but may be one or more. At this time, the positioning ring 79 engages with the mounting shaft 75 penetrating the mounting boss 78. Specifically, the projecting piece 84 of the positioning ring 79 is fitted into a groove 76 provided in the mounting shaft 75. Thereby, the posture of the holder 72 with respect to the mounting boss 78 is determined. In other words, when the positioning ring 79 is fixed to the mounting boss 78 in a predetermined posture, the pulley body 71 is inclined as shown in FIG. As described above, it is bridged between the fourth stage ladder 44 and the second stage ladder 46.

  Since a screw is formed on the outer peripheral surface of the mounting shaft 75, a tightening nut 86 is screwed onto the mounting shaft 75 penetrating the mounting boss 78 and the positioning ring 79. In this embodiment, another tightening nut 87 is provided, and this tightening nut 87 prevents the tightening nut 86 from loosening.

  The other pulleys 57, 63 and 65 have the same configuration as the pulley 55, and are positioned and fixed to the third stage ladder 45 and the second stage ladder 46 through the same mechanism as the positioning mechanism 70. . Therefore, detailed description of the structure of the other pulleys 57, 63 and 65 is omitted.

  In the fire engine 30 with an extendable ladder according to the present embodiment, the extendable ladder 32 is expanded and contracted by the extender 49 as described above. At this time, the pulleys 55, 57, 63, 65 are positioned and fixed to predetermined portions of the ladders 45, 46 by the positioning mechanism 70 as described above. Specifically, as shown in FIG. 3, the mounting shaft 75 of the pulley 55 is inserted into the mounting boss 78, and the mounting shaft 75 is positioned by a positioning ring 79 provided on the mounting boss 78. At this time, the projecting piece 84 of the positioning ring 79 is engaged with the groove 76 provided in the mounting shaft 75, and the mounting shaft 75 is restricted from rotating about its axial direction. By restricting the rotation of the mounting shaft 75 with respect to the mounting boss 78, the posture of the pulley 55 is maintained (see FIG. 4).

  That is, the pulley 55 is easily and reliably positioned and fixed by the positioning ring 79. Therefore, it is not necessary to machine a keyway on the inner wall surface of the mounting boss as in the prior art, and the pulley 55 can be positioned with respect to the ladder 45 at a low cost with a simple structure. In other words, the pulley 55 (and the other pulleys 57, 63 and 65) is positioned and fixed to a predetermined portion of the third stage ladder 45 or the second stage ladder 46 by the inexpensive positioning mechanism 70. Therefore, the structure of the expansion / contraction device 49 becomes simple, and as a result, a fire engine with an expansion / contraction ladder with reduced manufacturing costs can be provided.

  The present invention can be applied to a fire engine with a telescopic ladder.

FIG. 1 is a side view of a fire engine with a telescopic ladder according to an embodiment of the present invention. FIG. 2 is an exploded view of the telescopic ladder according to the embodiment of the present invention. FIG. 3 is an enlarged front view of a pulley provided on the telescopic ladder according to the embodiment of the present invention. FIG. 4 is an enlarged side view of a pulley provided on the telescopic ladder according to the embodiment of the present invention. FIG. 5 is a front view of an attachment boss provided on the telescopic ladder according to the embodiment of the present invention. FIG. 6 is an enlarged side view of a mounting boss provided on the telescopic ladder according to the embodiment of the present invention. FIG. 7 is a front view of a positioning ring provided on the telescopic ladder according to the embodiment of the present invention. FIG. 8 is an enlarged side view of a positioning ring provided on the telescopic ladder according to the embodiment of the present invention. FIG. 9 is a diagram schematically showing the structure of a conventional expansion / contraction device for a fire engine with an expansion / contraction ladder. FIG. 10 is an enlarged front view of a wire pulley of a telescopic device of a conventional fire engine with a telescopic ladder. FIG. 11 is an enlarged side view of a wire pulley of a conventional expansion and contraction device for a fire engine with a telescopic ladder.

Explanation of symbols

30 ... Fire truck with telescopic ladder 32 ... Telescopic ladder 40 ... Ladder frame 44 ... Fourth stage ladder 45 ... Third stage ladder 46 ... Second stage ladder 47 ... First stage ladder 49 ... telescopic device 50 ... telescopic cylinder 51 ... movable pulley 52 ... stretcher wire 53 ... pulley 54 ... stretcher wire 55 ... pulley 56 ... stretcher wire 57 ... Pulley 60 ... Shrinking wire 62 ... Shrinking wire 63 ... Pulley 64 ... Shrinking wire 65 ... Pulley 70 ... Positioning mechanism 71 ... Pulley body 72 ... Holding Tool 73 ... Holding plate 74 ... Holding plate 75 ... Mounting shaft 76 ... Groove 77 ... Pin 78 ... Mounting boss 79 ... Positioning ring 80 ... Slanted bone 81 ...・ Reinforcing member 82 Holes 83 ... through hole 84 ... projecting piece 85 ... inner circumferential surface 86 ... nut 87 ... tightening nut tightening

Claims (2)

A telescopic ladder in which a plurality of ladder bodies are combined in a nested manner,
A wire pulley positioned and fixed to a predetermined portion of one ladder main body through a positioning mechanism, and wound around the wire pulley, and one end is connected to a predetermined portion of the ladder main body arranged outside the one ladder main body And a fire extinguisher with a telescopic ladder that mounts a ladder telescopic device having a wire connected to a predetermined portion of the ladder main body, the other end of which is arranged inside the one ladder main body,
The positioning mechanism is
A mounting shaft provided on the wire pulley;
A cylindrical mounting boss provided in a predetermined portion of the one ladder main body, through which the mounting shaft is inserted;
A positioning ring provided on the mounting boss and through which the mounting shaft is inserted;
The positioning ring is a fire engine with a telescopic ladder provided with an engaging claw that engages with an engaging groove provided on the mounting shaft. The wire pulley has a pulley body around which the wire is wound, and a holder provided with the attachment shaft while holding the pulley body,
The engagement groove is provided on the outer peripheral surface of the mounting shaft so as to extend in the axial direction,
2. The fire engine with a telescopic ladder according to claim 1, wherein the engaging claw is a projecting piece projecting radially inward on an inner peripheral surface of the positioning ring.

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