JP6109697B2 - Ladder lifting device - Google Patents

Description

  The present invention relates to a ladder lifting device, and more particularly to a ladder lifting device for lifting a ladder stacked on an upper surface of a vehicle such as a fire truck.

  Conventionally, there exists a thing of patent document 1 as this kind of ladder raising / lowering apparatus. As shown in FIG. 18, this apparatus includes a bed portion 5 that houses a ladder 10, a base portion 6 that guides the bed portion 5 to slide in the vehicle front-rear direction, and a turning mechanism S that turns the bed portion 5. It is equipped with.

  The turning mechanism S includes a lift arm 1 whose other end is pivotally attached to the upper surface side of the vehicle, and a slide whose tip is pivotally attached to a substantially intermediate portion in the longitudinal direction of the lift arm 1 via a joint 9. An arm 2 and a support roller 3 that receives the slide arm 2 are provided. A guide roller 4 that rolls on the lower surface of the bed portion 5 is provided at the rear end portion of the slide arm 2, and an engaging portion 7 on one end side of the lift arm 1 is provided on the lower surface in front of the base portion 6. A U-shaped engaging portion 8 that is detachably fitted is provided.

  In this apparatus, in the state shown in FIG. 18 (the state in which the bed part 5 containing the ladder 10 is placed on the base part 6), the bed part 5 is moved backward by a predetermined size by operating the operation handle 11. By sliding, the engaging portion 7 on one end side of the lift arm 1 is engaged with the engaging portion 8 on the lower surface in front of the base portion 6.

  Thereafter, by applying an external force downward to the rear end portion of the bed portion 5, the bed portion 5 rotates around the pivot portion 12 at the other end portion of the lift arm 1, as shown in FIG. 19. Then, the ladder is lowered. At this time, the slide arm 2 is supported by the support roller 3 while sliding with respect to the support roller 3 provided on the rear end side of the base portion 6. Further, when the bed portion 5 rises from the state shown in FIG. 19 around the pivotal support portion 12 at the other end of the lift arm 1, the bed portion 5 becomes horizontal, and the bed portion 5 is moved forward from this state. By pressing, it returns to the state shown in FIG.

JP 2011-94403 A

  In the apparatus of Patent Document 1, as shown in FIG. 18, the bed portion 5 in which the ladder 10 is stored is placed on the placement portion of the base portion 6 that is relatively higher than the upper surface of the vehicle. is there. In this case, the slide arm 2 is placed on the support roller 3, and the lift arm 1 is relatively raised. For this reason, the overall height dimension of this device is large, and the vehicle height of a vehicle equipped with this device is high.

  Moreover, the engagement mechanism of the engagement part 7 on the lift arm 1 side and the U-shaped engagement part 8 on the bed part 5 side is such that the bed part 5 is positioned at a high position as shown in FIG. Therefore, there is a possibility that a large load is applied. For this reason, this engagement mechanism may be damaged.

  In view of the above problems, the present invention provides a ladder lifting device that can keep the height dimension small, is stable in strength, and has excellent operability.

  The ladder lifting device of the present invention includes a base member on a top surface of a vehicle body on which a main body frame arranged at a predetermined short height from the top surface is disposed, and a reciprocating motion in the vehicle longitudinal direction on the main body frame of the base member. A ladder member holding body that can be mounted, and a rotation permission mechanism that allows the rear end of the ladder member holding body to rotate downward in the rear-side sliding state of the ladder member holding body. A ladder lifting and lowering device comprising: a first arm pivotally connected to a front end portion of a ladder member holding body so as to be swingable; and a tip end of the first arm at a longitudinal intermediate portion of the first arm. And a second arm pivoted so that the part can swing. The other end of the first arm can reciprocate in the vehicle longitudinal direction, and the rear end of the second arm is the ladder member. Reciprocating motion along the holding body is possible, and the ladder member is held In the state where the rear end side of the ladder member holding body is applied in the horizontal state, the rear end side of the ladder member holding body is applied with a downward force so that the rear end portion of the ladder member holding body is The lower end and the front end portion of the ladder lowering state is located above, and from the ladder lowering state, by applying an external force in the upward direction on the rear end side of the ladder member holding body, by the displacement of the rotation permission mechanism, The ladder member holding body returns to the horizontal state, and in the horizontal state of the ladder member holding body, the first arm is in a substantially horizontal state of 10 degrees or less with respect to the horizontal plane, and the second arm is It is horizontally arranged and its lower side position is the same as the lower surface of the base frame of the base member or higher than the lower surface of the base member, and the rotation allowing mechanism is stored between the upper surface of the vehicle body and the ladder member holding body. It is on purpose made ones.

  According to the ladder lifting device of the present invention, in a state where the ladder member holding body is slid to the rear side in a horizontal state, the ladder member holding body is brought into a ladder down state by applying an external force downward on the rear end side of the ladder member holding body. From the lowered state, it returns to the horizontal state by applying external force in the upward direction on the rear end side of the ladder member holding body. For this reason, it is excellent in the raising / lowering workability | operativity of a ladder member holding body.

  In the horizontal state of the ladder member holding body, the first arm is substantially in a state of 10 degrees or less with respect to the horizontal plane, and the second arm is horizontally disposed in that state, and its lower side position is the base member. The height of the device can be set to be small because the height of the device is the same as or lower than the lower surface of the base member.

  And, in a state where the ladder member holding body is slid to the rear side in a horizontal state, the rear member is located on the rear side of the rear end of the base member, and by applying external force downward on the rear end side of the ladder member holding member, The second arm is slid while being supported by a support mechanism disposed at a position lower than the ladder member holder mounting surface of the main body frame of the base member, and the front end rises, and the first arm extends to the other end. The ladder member holding body is in a state of lowering the ladder with the rear end portion positioned below and the front end portion positioned above.

  Further, by applying external force upward from the ladder member holding body to the rear end side of the ladder member holding body, the ladder member holding body is placed on the rear side of the base member behind the base member. The second arm is slid while being supported by a support mechanism disposed at a position lower than the surface, and the front end of the second arm is tilted, and the first arm is tilted around the other end to hold the ladder member. The body returns to level.

  The second arm is slid while being supported by the support mechanism disposed behind the rear end of the base member and at a position lower than the ladder member holding body mounting surface of the main body frame of the base member. When the ladder member holder is slidable in the front-rear direction, the second arm is not disposed on the support mechanism. For this reason, even if such a support mechanism is provided, the distance (dimension) between the main body frame of the base portion on the upper surface of the vehicle can be set small. Thereby, the height dimension of the rotation allowing mechanism itself in the state where the ladder member holding body is arranged can be reduced. If the ladder member holding body is in a horizontal state, the first arm is set to 10 with respect to the horizontal plane. The second arm can also be set in a horizontal state.

  In a state where the ladder member holding body is slid rearward while being in a horizontal state, it is preferable to provide a lock mechanism in which the other end portion of the first arm is allowed to swing the first arm and is locked to the base member side. That is, when the ladder member holding body is rotated (turned) in a state where the ladder member holding body is slid rearward in a horizontal state, the other end portion of the first arm is rotated about the center. For this reason, by this lock mechanism, the other end of the first arm is locked to the base member side, so that the rotation (turning) of the ladder member holding body is stabilized.

  The lock mechanism is in a locked state when the ladder member holding body is shifted from the front installation state to the predetermined position backward to the ladder lowering state or in the ladder lowering state, and from the ladder lowering state of the ladder member holding body. When returning to the horizontal state, the locked state can be released.

  With this configuration, the operation from the unlocked state to the locked state and the operation from the locked state to the unlocked state can be performed stably and reliably.

  It is preferable that the ladder member holding body is provided with a stopper for restricting rearward sliding of the rear end portion of the second arm during the operation of the ladder member holding body from the ladder lowered state to the horizontal state. By providing such a stopper, when the ladder member holding body is returned from the ladder lowered state to the horizontal state, the backward sliding of the rear end portion of the second arm is restricted, and the first arm is moved by the second arm. It can be rotated forward.

  It is preferable to provide an urging means for urging the first arm in the direction of rotating the first arm toward the front side of the vehicle during the operation of the ladder member holding body from the ladder lowered state to the horizontal state. Further, the urging means can be constituted by a gas spring disposed horizontally in the horizontal state of the ladder member holding body.

  By applying an external force in the downward direction on the rear end side of the ladder member holding body, the ladder is lowered, and from the state in which the ladder member is held down, the horizontal state is restored by applying an external force in the upward direction on the rear end side of the ladder member holding body. For this reason, it is excellent in the raising / lowering workability | operativity of a ladder member holding body.

  The pivoting portion between the first arm and the ladder member holding body does not need to be separated, so that it can be constructed with a stable strength. When the ladder is lowered, the first arm and the ladder member holding body are pivoted. Even if the portion is positioned above, the ladder member holding body can be stably supported.

  The height dimension of this device can be set small, the vehicle height of the vehicle on which the device is mounted is not so high, and there are fewer roads where the vehicle height is too high to travel. It is possible to go stably to a place where the function of this vehicle is exhibited.

  In the case of having the lock mechanism, the ladder member holding body is stably rotated (turned), so that the operability is excellent. In the case of having the stopper, the work for returning the ladder member holding body from the ladder lowered state to the horizontal state is stabilized.

  In the case where the urging means is provided, the operation of returning the ladder member holding body from the ladder lowered state to the horizontal state can be performed by applying a light force, and the workability is excellent. In addition, if a gas spring is used as the biasing means, a large spring force (reaction force) can be obtained while being small and light, and the spring force (reaction force) takes advantage of being substantially constant over a long stroke. be able to.

It is a side view of the vehicle carrying the ladder raising / lowering apparatus of this invention. It is a simplified diagram of the state where a ladder member holding body is mounted on a vehicle. It is a simplification figure of the state where the ladder member holding body was slid back. It is a simplified diagram showing the way of lowering the ladder member holding body. It is a simplified view showing a ladder lowered state of the ladder member holding body. It is a side view which shows the locking mechanism which locks a 1st arm and a base member. It is a side view just before locking to a locking mechanism. The lock mechanism is shown, (a) is a side view in the unlocked state, and (b) is a side view in the locked state. It is a side view of a base member. It is a top view of a base member. It is a side view of a ladder member holding body. It is a top view of a ladder member holding body. It is an enlarged view of the pivot part of a 1st arm and a ladder member holding body. It is a top view which shows the relationship between a 1st arm, a 2nd arm, and a biasing means. It is a top view which shows the relationship between a base member, a 1st arm, and a 2nd arm. It is a side view which shows the relationship between a base member and a rotation permission mechanism. It is an enlarged view of the pivot part of a 1st arm and a 2nd arm. It is a side view which shows the conventional ladder raising / lowering apparatus. It is a simplification figure which shows the ladder lowering state of the conventional ladder raising / lowering apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a vehicle (fire truck) on which a ladder lifting apparatus according to the present invention is mounted. This fire engine is provided with a boarding cabin 21 disposed on the front side of a vehicle frame 20 and a vehicle body 22 arranged behind the boarding cabin 21. The vehicle body 22 is loaded with materials for fire fighting activities such as portable pumps and generators, materials for emergency activities, and the like.

  The passenger cabin 21 is a so-called double cabin type, and a space having a driver's seat 23 and a rear seat (not shown) behind the driver's seat is provided therein. That is, it includes left and right side walls 27, 27 having a front door 25 and a rear door 26, a front wall 29 having a front window 28, and a ceiling portion (roof portion) R.

  A ladder lifting device according to the present invention is mounted on the upper surface of the vehicle body 22. The ladder lifting device has a base member 31 having a main body frame 33 disposed on the upper surface of the vehicle body 22 by a predetermined short height from the upper surface thereof, and can reciprocate in the vehicle longitudinal direction with respect to the base member 31. The ladder member holding body 30 and a rotation permission mechanism K that allows the ladder member holding body 30 to turn downward at the rear end when the ladder member holding body 30 is slid rearward are provided.

  As shown in FIGS. 9 and 10, the base member 31 includes a main body frame 33 including a pair of front and rear direction members 32, 32 arranged in parallel at a predetermined constant interval, and a vehicle body 22 for supporting the main body frame 33. Leg members 34A, 34A, 34B, 34B, 34C, 34C, 34D, 34D, etc. The front-rear direction member 32 of the main body frame 33 is made of, for example, a channel material disposed so that the opening portions thereof face each other, and a guide rail that guides the slide in the front-rear direction of the ladder member holding body 30 as described later. Configure. The front and rear direction members 32 and 32 of the base member 31 are provided with guide members 87 and 87 and notches 89 and 89 on the rear side of the guide members 87 and 87. The guide member 87 guides a guide roller 38 of the second arm 62 described later to the notch 89.

  Further, the rear leg members 34D and 34D are connected by a connecting body 35 at the intermediate portion in the height direction, and a support mechanism M is provided on the rear side of the leg members 34D and 34D. The support mechanism M includes a roller member 36 and a support frame 37 that rotatably supports the roller member 36. The roller member 36 includes a rotation rod 41 that is rotatably supported by a pair of support frames 40, 40 of a support frame body 37, and a pair of support bodies 42, 42 that are externally fitted to the rotation rod 41. For this reason, the support mechanism M is disposed behind the rear end of the base member 31 and at a lower position than the ladder member holding body mounting surface of the main body frame 33 of the base member 31. Further, the roller member 36 of the support mechanism M protrudes rearward from the rear surface of the vehicle body 22.

  As shown in FIGS. 11 and 12, the ladder member holding body 30 includes a pair of front and rear direction members 44 and 44 arranged in parallel at predetermined intervals, and a connecting body 45 that connects the front and rear direction members 44 and 44. A basic frame 46 having The front-rear direction members 44, 44 are formed of, for example, a hollow body having a square or rectangular cross section, and ladder receivers 47, 47 made of an L-shaped material are attached to the upper surface thereof. A ladder 50 is received by the ladder receivers 47 and 47. Note that the ladder receivers 47 and 47 are not provided at the rear end portions of the front and rear direction members 44 and 44, and a member for fixing the ladder 50 (a banding band member) is provided on the outer surface of the rear end portion. And a mounting portion 51 is provided for mounting a tape with a surface fastener or the like. As a ladder 50 that can be stored, there are various types such as a double ladder, a triple ladder, and a ladder with a hook.

  Further, a pivot attachment structure 52 is provided at the front end portion of the basic frame 46, to which one end portions 61a and 61a of first arms 61 and 61, which will be described later, of the rotation permission mechanism K are pivotally attached. The pivot structure 52 has a pair of support legs 53 and 53 suspended from the front end portions of the front and rear direction members 44 and 44. As shown in FIG. One end portions 61a and 61a of the first arms 61 and 61 are pivotally attached to the first and second arms 61 and 61 through 55 and 55, respectively. Each support leg 53 includes a pair of support plates 56, 56, and one end portions 61 a, 61 a of the first arms 61, 61 are fitted between the support plates 56, 56, and are pivoted by a pivot shaft 55. Be supported.

  As shown in FIG. 14 to FIG. 16, the rotation allowing mechanism K is a pair of the first arms 61, 61 that are pivotally coupled to the front end portion of the ladder member holding body 30 so that the one end portions 61 a, 61 a can swing. And second arms 62 and 62, which are pivotally connected at the intermediate portions in the longitudinal direction of the first arms 61 and 61 so that the tip ends 62a and 62a can swing. As shown in FIG. 14, the first arms 61 and 61 and the second arms 62 and 62 corresponding to the first arms 61 and 61 are respectively arranged in the same straight line. , 32. For this reason, as will be described later, the first arm 61 and the second arm 62 are allowed to rise from the upper surface 22a of the vehicle body 22.

  The first arm 61 is formed of, for example, a hollow rectangular body. As described above, the one end 61a is pivotally supported by the pivot attachment structure 52 at the front end of the ladder member holding body 30, and the first arm 61 rotates around the one end 61a. Can move. Further, the distal end portion 62a of the second arm 62 is pivotally connected via a connecting portion 63 provided in the middle portion in the longitudinal direction of the first arm 61, and the second arm 62 rotates around the distal end portion 62a. be able to.

  As shown in FIG. 17, the connecting portion 63 has a pair of support plates 64, 64 protruding from the longitudinal middle portion of the first arm 61, and the second arm 62 is interposed between the support plates 64, 64. The distal end portion 62 a is inserted and pivotally supported by the pivot shaft 65. Further, the pair of first arms 61 and 61 and the pair of second arms 62 and 62 are connected by connecting members 66 and 67, respectively.

  A traveling mechanism 70 that can travel along the lower surfaces of the front and rear direction members 44 of the ladder member holding body 30 is provided at the rear end portion of the second arm 62. As shown in FIGS. 15 and 16, the traveling mechanism 70 includes a shaft member 71 that is rotatably disposed so as to connect the rear end portion of the second arm 62, and an end portion of the shaft member 71. And a roller 72. For this reason, the roller 72 of the traveling mechanism 70 travels in the front-rear direction along the lower surfaces of the front-rear direction members 44, 44 of the ladder member holding body 30.

  As shown in FIGS. 2 to 5 and the like, the second arms 62 and 62 are provided with guide rollers 38 and 38 on the outer surfaces closer to the front end portions 62a and 62a than the intermediate portion in the longitudinal direction. The guide rollers 38 and 38 are in the state shown in FIGS. 2 and 3 (in the front and rear direction members 32 and 32 of the base member 31 in the state where the ladder member holding body 30 is horizontally disposed). The second arm 62, 62 guides the horizontal travel. For this reason, in a state where the guide rollers 38 and 38 are accommodated in the front-rear direction members 32 and 32, the rotation (rotation) of the ladder member holding body 30 can be restricted.

  In addition, a lock mechanism R is provided in which the other end 61b of the first arm 61 is locked on the base member 31 side so that the first arm 61 can swing. As shown in FIGS. 6 to 8, the lock mechanism R includes a first engagement portion 75 provided at the other end portion 61 b of the first arm 61 and a second member provided at the rear leg member 34 </ b> C of the base member 31. And an engaging portion 76.

  The first engaging portion 75 has a flat plate-like body 77. The flat plate-like body 77 has an upper side inclined to a horizontal tip portion 77a, an intermediate inclined portion 77b inclined downward from the horizontal tip portion 77a, and a downwardly downward direction from the intermediate inclined portion 77b. And a rear end inclined portion 77c. A notch 79 is provided on the lower side of the flat plate-like body 77, and a flange 78 is provided on the front end of the lower side of the flat plate-like body 77.

  The second engaging portion 76 includes a pair of flat plate members 80, 80 and a connecting body 81 that connects the front end portions of the flat plate members 80, 80. The rear end portions of the pair of flat plate members 80, 80 are pivoted. It is pivotally supported by a support block body 83 provided on the base member 31 via a support shaft 82. For this reason, the flat plate members 80 and 80 of the second engaging portion 76 are rotatable as indicated by arrows A1 and A2 in FIG. 6 around the rear end portion. In this case, the connecting body 81 is positioned higher than the extension line L on the lower side of the first engaging portion 75. The support block 83 is disposed in a U-shaped holding frame 88 fixed to the leg member 34 c of the base member 31.

  When the first arm 61 slides backward from the state shown in FIG. 6 and the first engagement portion 75 reaches the second engagement portion 76 as shown in FIG. The rear end inclined portion 77 c of the shape body 77 contacts the connecting body 81 of the second engagement portion 76. If the first arm 61 further slides backward from this contact state, the connecting body 81 is pressed by the rear end inclined portion 77c of the flat plate-like body 77, and the second engaging portion 76 has a rear end portion. Is pivoted in the direction of arrow A1 to allow the first engagement portion 75 to move backward. As a result, the flat plate-like body 77 of the first engagement portion 75 enters between the flat plate members 80, 80 of the second engagement portion 76, resulting in the state shown in FIG.

  In this state, the plate member 80 is swung in the direction of the arrow A <b> 2, and the flat plate member 80 is received by the flange portion 78 at a position rearward of the connecting member 81.

  An unlock member 84 is provided at the other end 61 b of the first arm 61. The unlocking member 84 is formed of a bar that is inclined at a predetermined acute angle with respect to the extension line L. When the first arm 61 swings around the other end 61 as shown in FIGS. In the state where the first arm 61 is rotated and deployed, as shown in FIG. 8B, the first arm 61 is not in contact with the flat plate members 80 and 80 of the second engaging portion 76 to be in the locked state, and conversely, the rotational deployment. When the first arm 61 returns to the horizontal state from the state as shown in FIG. 3, the flat plate members 80 and 80 of the second engaging portion 76 are pushed up as shown in FIG. Is released.

  The other end portion 61b of the first arm 61 is provided with a rotating body 85 for smoothly rotating the first arm 61 around the other end portion 61b of the first arm 61 in the locked state. Yes.

  By the way, as shown in FIGS. 14 and 16 and the like, the rotation permission mechanism K is provided with a biasing means F that biases the first arm 61 in a direction in which the first arm 61 is rotated forward. In this case, the urging means F is composed of three gas springs 90.

  The gas spring 90 includes a cylinder body 90a and a rod 90b extending from the cylinder body 90a. In addition, the first arms 61 and 61 are connected by a connecting member 91 between the other end portions 61 b and 61 b of the first arms 61 and 61 and the joint portion of the second arms 62 and 62. And the base end part of the cylinder main body 90a of the gas spring 90 is connected to the connecting member 91 through the support mechanism 92 so as to be swingable. Further, slide members 95, 95 that can slide along the front-rear direction members 32, 32 of the main body frame 33 are provided, the rear sides of the slide members 95, 95 are connected by a connecting member 93, and the rod of the gas spring 90 The end of 90b is pivotally connected to the connecting member 93.

  A rotating body 96 is attached to the slide members 95 and 95. The rotating body 96 can travel in the front-rear direction member 32 of the base member 31.

  Meanwhile, as shown in FIG. 11, a stopper 98 that restricts the rearward sliding of the second arm 62 is provided on the lower surface of the ladder member holding body 30. The stopper 98 is made of an L-shaped member attached to the lower surface of the longitudinal members 44, 44 of the ladder member holding body 30. In this case, it opens toward the front.

  Next, the usage method of the ladder raising / lowering apparatus comprised as mentioned above is demonstrated. First, as shown in FIGS. 1 and 2, the ladder member holding body 30 is placed on the upper surface of the vehicle body 22 of the vehicle via the base member 31, and the ladder is lowered as shown in FIG. 5. The operation method will be described.

  In the state shown in FIG. 2, the second arm 62 is in a horizontal state parallel to the upper surface 22 a of the vehicle body 22, and the lower side of the second arm 62 is connected to the lower surface of the main body frame 33 of the base member 31. They are arranged at the same height or higher than the lower surface of the main body frame 33. The first arm 61 is in a substantially horizontal state of 10 degrees or less with respect to the horizontal plane, that is, the angle θ formed by the upper surface 22a of the vehicle body 22 and the first arm 61 is 10 degrees or less. Further, the gas spring 90 that constitutes the urging means F is also arranged horizontally, and the height position of the gas spring 90 is also between the first arm 61 and the second arm 62. That is, the gas spring 90 is not positioned below the first arm 61 and is not positioned above the second arm 62. For this reason, the rotation permission mechanism K is in a state of being accommodated between the upper surface 22a of the vehicle body 22 and the ladder member holding body 30 (accommodated state).

  Thus, it is preferable to provide a lock means (not shown) that restricts the sliding of the ladder member holding body 30 in the front-rear direction in a state where the ladder member holding body 30 is slid forward in a horizontal state. The locking means can be configured by a known / public existing mechanism (for example, a hook mechanism).

  From the state shown in FIG. 2, the locking state of the locking means (not shown) is released, and as shown in FIG. 3, the ladder member holding body 30 is slid rearward as shown by an arrow B1. At this time, the first arm 61 is connected to the ladder member holding body 30, the second arm 62 is connected to the first arm 61, the gas spring 90 is connected to the first arm 61, and the slide member 95 is connected to the connecting member 93. 2, the first arm 61, the second arm 62, the gas spring 90, and the slide member 95 maintain the posture shown in FIG. 2 as the ladder member holding body 30 slides. Slide backwards. In this sliding state, the guide rollers 38, 38 of the second arms 62, 62 travel while being guided by the front-rear direction members 32, 32 of the base member 31 constituting the guide rail.

  3, the rear end portion 62b of the second arm 62 protrudes rearward from the roller member 36 of the support mechanism M. The second arms 62 and 62 slide on the support 42 of the roller member 36 of the support mechanism M, respectively. 3, the guide rollers 38 and 38 of the second arms 62 and 62 are in a state corresponding to the notches 89 and 89 of the longitudinal members 32 and 32 of the base member 31.

  By applying a downward load to the rear end portion of the ladder member holding body 30 from the state shown in FIG. 3, the ladder member holding body 30 has an arrow C1 around the other end portion 61b of the first arm 61. Rotate in the direction. At this time, as shown in FIG. 4, the first arm 61 rises around the other end 61 b, and the second arm 62 rises as the first arm 61 rises while being in sliding contact with the roller member 36. . For this reason, the front end portion of the ladder member holding body 30 rises as a turning locus of the one end portion 61 a of the first arm 61. Finally, as shown in FIG. 5, the first arm 61 and the second arm 62 have a character shape of “person” in a side view, and are in a state where the ladder is lowered. When the second arm 62 rises, the guide roller 38 of the second arm 62 comes out of the front-rear direction member 32 through the notch 89 of the front-rear direction member 32 of the base member 31. Further, when the first arm 61 rotates in the direction of the arrow C1 around the other end 61b, the other end 61b and the base member 31 side are locked by the lock mechanism R.

  Since the slide members 95, 95 have a rotating body 96 that rolls in the front-rear direction member 32 that forms the guide rail of the main body frame 33, the slide members 95, 95 remain on the base member side. The gas spring 90 in which the base end portion of the cylinder body 90a is pivotally connected to the connecting member 91 of the first arm 61 via the connecting member 91 is inclined in a side view and the second arm 62. Become parallel.

  Then, if the ladder member holding body 30 is pushed up in the direction of arrow D (inclination direction of the ladder member holding body 30) from the state shown in FIG. 5 (ladder lowered state), the roller 72 of the traveling mechanism 70 is moved to the ladder. The lower surfaces of the front and rear direction members 44, 44 of the member holding body 30 roll to engage the rear end 62b of the second arm 63 with the stopper 98 of the ladder member holding body 30, and from this state, the ladder member holding body is further engaged. If 30 is pushed in the arrow D direction, the first arm 61 is pressed by the second arm 61, and the first arm 61 rotates in the arrow C2 direction around the other end 61b. As shown in FIG. 3 through the state shown in FIG. 4, the ladder member holding body 30 is in a horizontal state on the rear end side of the vehicle body 22. When the state shown in FIG. 4 is returned to the state shown in FIG. 3, the guide roller 38 of the second arm 62 is inserted into the front-rear direction member 32 of the base member 31 through the notch 89. . This insertion operation is guided by the guide member 87. That is, the guide roller 38 slides on the rising portion of the guide member 87 and is inserted into the front-rear direction member 32 through the notch 38.

  By the way, from the state shown in FIG. 5 to the state shown in FIG. 3, the first arm 61 is urged in the direction of turning to the vehicle front side by the restoring force of the gas spring. In the state shown in FIG. 3, since the lock state of the lock mechanism R is released, if the ladder member holding body 30 is pressed in the direction of the arrow B2, the slide in the direction of the arrow B2 is not restricted. Return to the original state shown in FIG.

  In the present invention, by applying an external force in the downward direction on the rear end side of the ladder member holding body 30, the ladder is lowered, and from applying the external force in the upward direction on the rear end side of the ladder member holding body 30, Return to level. For this reason, the raising / lowering workability of the ladder member holding body 30 is excellent.

  The pivoting portion between the first arm 61 and the ladder member holding body 30 does not need to be separated from each other, and therefore can be configured with a stable strength. When the ladder is lowered, the first arm 61 and the ladder member holding body 30 are configured. The ladder member holding body 30 can be stably supported even if the pivoting portion is positioned above.

  The height dimension of this device can be set small, the vehicle height of the vehicle on which the device is mounted is not so high, and there are fewer roads where the vehicle height is too high to travel. It is possible to go stably to a place where the function of this vehicle is exhibited.

  The one having the lock mechanism R is excellent in operability since the rotation (turning) of the ladder member holding body 30 is stable. In the case of having the stopper 98, the operation for returning the ladder member holding body 30 from the ladder lowered state to the horizontal state is stabilized. In addition, when the ladder member holding body 30 is slid backward from the front installation state to a predetermined position, the ladder member holding body 30 is in the locked state at the time of transition from the ladder lowering state to the ladder lowering state or the ladder lowering state. When returning to the state, the locked state is released. For this reason, the operation from the unlocked state to the locked state and the operation from the locked state to the unlocked state can be performed stably and reliably.

  In the case where the urging means F is provided, the operation of returning the ladder member holding body 30 from the ladder lowered state to the horizontal state can be performed by applying a light force, and the workability is excellent. In addition, if a gas spring is used as the urging means F, a large spring force (reaction force) can be obtained while being small and light, and the spring force (reaction force) is almost constant over a long stroke. You can save it.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made. Although it is a double cabin type having a rear seat behind the driver's seat, it may be a single cabin type having no rear seat behind. The passenger cabin 21 has a so-called high roof specification, but is not limited to such a high roof specification, and may be a middle roof specification, a low roof specification, or the like.

  The height dimension of the main body frame 33 of the base member 31 from the upper surface 22a of the vehicle body 22 is set to the minimum dimension within the range in which the rotation permissible mechanism K is stored between the main body frame 33 and the upper surface 22a. Preferably, it can be set arbitrarily. In this case, the first arm 61 is in a substantially horizontal state of 10 degrees or less with respect to the horizontal plane, and the second arm 62 is disposed horizontally and its lower side position is in contact with the lower surface of the main body frame 33 of the base member 31. It is necessary to be higher than the lower surface of the main body frame 33 of the same or base member 31.

  Further, the interval between the front and rear direction members 32 of the main body frame 33 of the base member 31 can be variously set according to the width dimension of the ladder member holding body 30, and the width dimension of the ladder member holding body 30 is determined by this ladder member holding. Various settings can be made according to the width of the ladder 50 accommodated in the body 30. The distance between the first and second arms 61 and 62 can be variously changed according to the distance between the longitudinal members 32 and 32 of the main body frame 33 of the base member 31.

  The substantially horizontal state where the first arm 61 is 10 degrees or less with respect to the horizontal plane (the upper surface 22a of the vehicle body 22) may have an angle of 0 °. The horizontal shape of the second arm 62 is about 0 ° ± 5 ° with respect to the horizontal plane. Here, “+” is a case where the second arm 62 rotates around the rear end 62b and the front end 62a is positioned above the horizontal plane, and “−” is the second arm. This is a case where 62 rotates around the rear end portion 62b and the front end portion 62a is positioned below the horizontal plane. In order to correspond to these, in the present invention, the first arm 61 is in a substantially horizontal state of 10 degrees or less with respect to the horizontal plane. The first arm 61 rotates around the other end 61b and one end thereof. This is a case where 61a is positioned above the horizontal plane.

  As the urging means F, the gas spring 90 is used in the above embodiment, but other urging and urging members can be used. Although the workability is somewhat inferior, the biasing means F may not be provided. Thus, when the urging means F is not provided, the overall apparatus can be simplified, and the cost and weight can be reduced. In addition, when using the gas spring 90, it is not restricted to three like an example of a figure.

  As shown in FIG. 5, the inclination angle of the ladder member holding body 30 in the ladder lowered state can be variously changed within a range in which the ladder can be lowered. Further, the operability from the state shown in FIG. 2 to the state shown in FIG. 3, the operability from the state shown in FIG. 3 to the ladder down state, and the operability from the ladder down state to the state shown in FIG. In view of the operability from the state shown to the state shown in FIG. Further, the vehicle on which the ladder lifting device is mounted is not limited to a fire truck, and may be a rescue vehicle (rescue machine vehicle) or the like.

22 Vehicle body 22a Upper surface 23 Driver's seat 31 Base member 33 Main body frame 61 First arm 61a One end 61b Other end 62 Second arm 62a Front end 62b Rear end 90 Gas spring 98 Stopper K Rotation allowance mechanism M Support mechanism R Lock mechanism F Energizing means

Claims (8)

A base member in which a main body frame arranged at a predetermined short height from the upper surface is disposed on the upper surface of the vehicle body, and a ladder placed on the main body frame of the base member so as to be capable of reciprocating in the vehicle longitudinal direction. A ladder lifting device including a member holding body and a rotation permission mechanism that allows a downward rotation of the rear end of the ladder member holding body in a rear side sliding state of the ladder member holding body,
The rotation permission mechanism includes a first arm pivotally connected to a front end portion of a ladder member holding body so that the end portion can swing, and a tip end portion swingable to an intermediate portion in the longitudinal direction of the first arm. And the other end of the first arm is capable of reciprocating in the vehicle longitudinal direction, and the rear end of the second arm is reciprocating along the ladder member holding body. In the state where the ladder member holding body is slid rearward in a horizontal state, the ladder is held by the displacement of the rotation allowing mechanism by applying an external force downward on the rear end side of the ladder member holding body. The member holding body is in a ladder lowering state in which the rear end portion is located below and the front end portion is located above, and from the ladder lowering state, by applying external force in the upward direction on the rear end side of the ladder member holding body, By the displacement of the rotation permission mechanism, The child member holding body returns to a horizontal state, and in the horizontal state of the ladder member holding body, the first arm is in a substantially horizontal state of 10 degrees or less with respect to the horizontal plane, and the second arm is in a horizontal state. The lower side position is the same as the lower surface of the base frame of the base member or higher than the lower surface of the base frame of the base member, and the rotation allowing mechanism is stored between the upper surface of the vehicle body and the ladder member holding body. The ladder raising and lowering device characterized by becoming.   In a state where the ladder member holding body is slid to the rear side in a horizontal state, the base member is provided on the rear side of the rear end of the base member by applying an external force downward on the rear end side of the ladder member holding body. The second arm is slid while being supported by a support mechanism disposed at a position lower than the ladder member holding body mounting surface of the body frame of the main body frame, and the leading end of the second arm rises, and the first arm has the other end. 2. The ladder lifting apparatus according to claim 1, wherein the ladder member holding body rises in the center and is in a ladder-lowering state in which a rear end portion thereof is positioned below and a front end portion thereof is positioned above.   By applying external force upward from the ladder member holding body to the rear end side of the ladder member holding body, the rear side of the base member is behind the rear end of the ladder member holding body mounting surface of the base member body frame. The second arm is slid while the second arm is supported by the support mechanism disposed at the lower position, and the tip end part thereof falls, the first arm falls about the other end part, and the ladder member holding body is The ladder elevating device according to claim 1, wherein the ladder elevating device returns to a horizontal state.   A locking mechanism is provided in which the other end of the first arm is allowed to swing the first arm and locked to the base member side in a state where the ladder member holding body is slid rearward in a horizontal state. The ladder elevating device according to any one of claims 1 to 3.   The lock mechanism is in a locked state when the ladder member holding body is shifted from the front installation state to the predetermined position backward to the ladder lowering state or in the ladder lowering state, and from the ladder lowering state of the ladder member holding body. The ladder raising / lowering device according to claim 4, wherein the locked state is released when returning to the horizontal state.   The ladder member holding body is provided with a stopper for restricting rearward sliding of the rear end portion of the second arm during the operation of the ladder member holding body from the ladder lowered state to the horizontal state. The ladder raising / lowering device according to any one of claims 5 to 6.   The urging means for urging the first arm in a direction of rotating the first arm forward of the vehicle during the operation of the ladder member holding body from the ladder lowered state to the horizontal state is provided. The ladder raising / lowering apparatus of any one of claim | item 6.   The ladder raising / lowering apparatus according to claim 7, wherein the biasing means includes a gas spring arranged horizontally in a horizontal state of the ladder member holding body.

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