JP6435214B2 - Ladder lifting device - Google Patents

Description

  The present invention relates to a ladder lifting device that lifts and lowers a ladder mounted on a vehicle. More specifically, the ladder lowering state can be selected according to the number of workers, and the workability during ladder transportation is improved. The present invention relates to a ladder lifting device.

  A ladder such as a triple ladder or a ladder with a hook is mounted on the top of a vehicle such as a rescue work vehicle or a fire engine. In this way, the ladder is lowered from the vehicle in an emergency or the like, transported to the site, used, and returned to the upper part of the vehicle after use.

  Conventionally, as a ladder raising and lowering device for raising and lowering a ladder mounted on a vehicle, it has a pedestal installed on the upper part of the vehicle and a ladder frame that is usually located on the pedestal and mounts the ladder, and the ladder frame is There has been proposed a device that moves the vehicle rearward by a turning mechanism or a guide mechanism and holds the ladder frame in an inclined state within the reach of the operator's hand (see, for example, Patent Document 1).

  In a vehicle equipped with such a ladder lifting device, an operator removes the ladder from the ladder frame while the ladder frame is inclined on the vehicle rear side, and transports the ladder to the site. For example, when transporting work is performed by two workers, one worker holds one end of the ladder and pulls out the ladder while sliding on the ladder frame, and then the other worker holds the other end of the ladder. These two workers will carry the ladder.

  However, when an emergency is required, it is not possible to secure a sufficient number of workers, and there is a case where one worker is required to lower the ladder from the ladder frame and carry it. In such a case, one worker once lowers the ladder to the ground, and from that state, the ladder is transported using a caster attached to the ladder.

  However, in a vehicle equipped with the conventional ladder lifting device described above, it is extremely difficult to reverse the ladder alone when the ladder frame is tilted on the vehicle rear side and the lower end of the ladder is lowered to the ground as it is. . Further, it is conceivable to pull one end of the ladder from the state in which the ladder frame is inclined on the rear side of the vehicle and pull the other end to the ground. In that case, the ladder may be damaged. For this reason, the above-described ladder lifting device is not suitable for carrying the ladder alone.

Japanese Patent No. 5275206

  SUMMARY OF THE INVENTION An object of the present invention is to provide a ladder elevating device that makes it possible to select a descending state of a ladder according to the number of workers and to improve workability during ladder transport.

In order to achieve the above object, a ladder raising / lowering apparatus according to the present invention includes a pedestal installed in an upper part of a vehicle, a guide frame extending in the longitudinal direction of the vehicle along the pedestal, and a ladder mounted thereon and the guide frame. And a ladder frame that is movably installed along the ladder frame. A slide frame that extends toward the front side of the vehicle is swung with respect to the ladder frame at an intermediate portion in the longitudinal direction of the ladder frame. The ladder frame is provided with a lock device for engaging the slide frame with the guide frame , and fixing the slide frame to the ladder frame integrally with the ladder frame. A switch for opening and closing the device is provided .

  In the present invention, a pedestal installed on the upper part of the vehicle, a guide frame extending along the gantry in the front-rear direction of the vehicle, a ladder frame mounted with a ladder and movably installed along the guide frame, In a ladder lifting device having a ladder frame, a slide frame extending toward the front side of the vehicle is slidably connected to a middle portion of the ladder frame in the longitudinal direction, and the slide frame is engaged with the guide frame. By adopting the structure, the first inclined state in which the ladder frame is inclined by moving the ladder frame to the vehicle rear side along the guide frame while integrally holding the ladder frame and the slide frame; The ladder frame is erected by swinging the ladder frame with respect to the slide frame from the first inclined state. It is possible to realize the oblique state.

  In the first inclined state, the lower end of the ladder frame is in the vicinity of the operator's waist position and the ladder frame is gently inclined, so that the two workers can smoothly carry the ladder, and the second inclined state. Then, since the lower end of the ladder frame is in the vicinity of the ground and the ladder frame stands up in a state close to the vertical direction, one worker can easily reverse the ladder after lowering the lower end of the ladder to the ground. Therefore, according to this invention, the descent | fall state of a ladder is suitably selected according to the number of workers, and workability | operativity at the time of ladder conveyance can be improved.

  In the present invention, it is preferable to provide a support for supporting the slide frame in the state where the ladder frame is moved to the rearmost side of the vehicle at the rear end of the gantry. By installing such a support, the slide frame and the ladder frame connected thereto can be stably supported in the first inclined state.

  The guide frame is preferably provided with a speed reduction device that reduces the moving speed of the slide frame toward the vehicle rear side. By installing such a reduction gear on the guide frame, the moving operation of the ladder frame to the vehicle rear side can be performed smoothly.

  Furthermore, the ladder frame is preferably provided with a lock device that integrally fixes the slide frame to the ladder frame. By providing such a lock mechanism on the ladder frame, it is possible to smoothly switch from the first inclined state to the second inclined state.

It is a side view which shows the ladder raising / lowering apparatus which consists of embodiment of this invention. It is a side view which shows the 1st inclination state of the ladder raising / lowering apparatus of FIG. It is a side view which shows the 2nd inclination state of the ladder raising / lowering apparatus of FIG. It is a top view which shows the mount frame provided with the guide rail. It is a bottom view which shows the ladder frame provided with the slide frame. It is explanatory drawing which shows the conveyance operation | work of the ladder in a 1st inclination state. It is explanatory drawing which shows the conveyance operation | work of the ladder in a 2nd inclination state.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. 1 to 7 show a ladder lifting apparatus according to an embodiment of the present invention.

  As shown in FIGS. 1-3, the ladder raising / lowering apparatus of this embodiment is installed in the upper part of the vehicle 1 which consists of a rescue work vehicle. The vehicle 1 includes a plurality of storages 2 for storing tools and the like. A work table 4 is installed behind the rear wheel 3 of the vehicle 1, and handrails 5 and 6 are provided on the work table 4. Note that the configuration of the vehicle 1 is not particularly limited.

  The ladder lifting device includes a gantry 11 installed on the upper portion of the vehicle 1, a pair of guide frames 12 extending in the front-rear direction of the vehicle 1 along the gantry 11, and a ladder frame 14 on which the ladder 13 is mounted. ing. Each of the guide frames 12 is provided with a guide path formed of a concave groove along the longitudinal direction. The configuration of the ladder 13 is not particularly limited, but includes a leg portion 15 and a caster 16 here. The ladder frame 14 is configured to be movable along the guide frame 12. The ladder frame 14 is normally placed on the gantry 11, but is manually pulled out to the rear side of the vehicle 1 when the ladder 13 is used. In addition, a gripping device 17 for gripping the ladder frame 14 is installed on the gantry 11, and opening and closing of the gripping device 17 is operated by a handle 18.

  The ladder frame 14 can mount the ladder 13 and has a function of arbitrarily fixing the ladder 13, but the specific structure is not particularly limited. A slide frame 19 extending toward the front side of the vehicle 1 is connected to an intermediate portion in the longitudinal direction of the ladder frame 14, preferably a central portion in the longitudinal direction of the ladder frame 14. As shown in FIGS. 3 and 5, the slide frame 19 has a ladder-like structure, and is supported to be swingable with respect to the ladder frame 14 via the rotation shaft 20. A pair of guide rollers 21 are attached to the tip of the slide frame 19, and these guide rollers 21 are engaged with the guide frame 12. At the rear end portion of each guide frame 12, a speed reduction device 22 that urges the guide roller 21 toward the front side of the vehicle 11 and reduces the moving speed of the slide frame 19 toward the rear side of the vehicle is installed. For example, a spring can be used as the speed reducer 22.

  The ladder frame 14 is provided with a slide rail 23 so as to form the same surface as the slide frame 19. Thus, by providing the slide rail 23 with the slide frame 19, the ladder frame 14 moves smoothly on the gantry 11. As shown in FIGS. 3 and 5, the ladder frame 14 is provided with a lock device 24. The locking device 24 is configured to integrally fix the slide frame 19 to the ladder frame 14 by engaging a hook-shaped hook with the slide frame 19. The lock device 24 is opened and closed by a switch 25 installed on the ladder frame 14.

  Further, a lever 26 is attached to the rear end portion of the ladder frame 14 for moving the ladder frame 14. The lever 26 is inclined forward while extending downward while the ladder frame 14 is on the mount 11. Therefore, the lever 24 does not interfere with the ground when the ladder frame 14 is pulled out to be in a first inclined state or a second inclined state described later.

  On the other hand, as shown in FIG. 4, the support roller 27 that rolls when contacting the ladder frame 14 that moves in the front-rear direction of the vehicle 1, and the ladder frame 14 are located at the rearmost side of the vehicle 11 A support 28 that supports the slide frame 19 in the state of being moved to is disposed. Since the support body 28 comes into contact with the slide frame 19 only when the ladder frame 14 is inclined, the support body 28 is disposed on the rear side and the lower side with respect to the support roller 27. As the support 28, a bar extending in the width direction of the gantry 11 can be used. For example, the surface is preferably covered with a cushion material such as rubber.

  Next, the ladder conveyance work by the ladder raising / lowering apparatus mentioned above is demonstrated. First, when the vehicle 1 is in a running state or a normal stop state, the ladder frame 14 on which the ladder 13 is mounted is positioned on the gantry 11.

  When the ladder 13 is used, the ladder frame 14 is moved to the rear side by releasing the fixation of the ladder frame 14 by the gripping device 17 by operating the handle 18 and pulling the lever 26 to the rear side of the vehicle 1. As a result, the ladder frame 14 moves rearward along the guide frame 12, and the inclination angle of the ladder frame 14 increases accordingly. Further, when the protruding amount of the ladder frame 14 to the rear side increases, the speed reduction device 22 functions to reduce the moving speed of the slide frame 19 to the vehicle rear side. For this reason, the ladder frame 14 can be pulled out safely. Then, the slide frame 19 is supported by the support body 28 in a state where the ladder frame 14 is moved to the rearmost side. As a result, as shown in FIG. 2, the ladder frame 14 is tilted while the ladder frame 14 and the slide frame 19 are integrally held, and the first inclined state is obtained.

  Furthermore, the lock by the lock device 24 is released by operating the switch 25 from the first inclined state, and the ladder frame 24 is swung with respect to the slide frame 19 to raise the ladder frame 24 as shown in FIG. It will be in the 2nd inclination state.

  FIG. 6 is an explanatory view showing a ladder transfer operation in the first inclined state. In the first inclined state, the lower end of the ladder frame 14 is in the vicinity of the operator's waist position, and the ladder frame 14 is gently inclined, which is suitable when two workers carry out the transfer work. That is, when two workers perform a transport operation, as shown in FIG. 6, one worker holds one end of the ladder 13 and pulls out the ladder 13 while sliding on the ladder frame 14. An operator has the other end of the ladder 13, and the two workers can carry the ladder 13.

  FIG. 7 is an explanatory view showing a ladder transfer operation in the second inclined state. In the second inclined state, the lower end of the ladder frame 14 is in the vicinity of the ground, and the ladder frame 14 stands up in a state close to the vertical direction, which is suitable when a single worker performs a transfer operation. In other words, when a single worker performs a transfer operation, as shown in FIG. 7, the ladder 13 is reversed after one worker lowers the lower end of the ladder 13 to the ground, but the lower end of the ladder frame 14 is Since it is near the ground and the ladder frame 14 stands up in a state close to the vertical direction, the reversing operation can be easily performed. The ladder 13 laid on the ground in this way can be transported by one person using the caster 16. Moreover, since the ladder 13 is not dropped roughly from a high position, damage to the ladder 13 can be avoided.

  As apparent from the above description, in the ladder lifting device, the first inclined state and the second inclined state can be appropriately selected as the descending state of the ladder 13 according to the number of workers, and the ladder 13 is conveyed. The workability at the time of doing can be improved.

  In addition, when returning the ladder 13 to the upper part of the vehicle 1, the above operation may be performed in reverse. At that time, when two workers are present, the ladder 13 is loaded on the ladder frame 14 in the first inclined state, and when one worker is employed, the ladder 13 is loaded on the ladder frame 14 in the second inclined state. It ’s fine.

  In the ladder lifting device, since the support body 28 that supports the slide frame 19 is provided at the rear end of the gantry 11 in a state where the ladder frame 14 is moved to the rearmost side of the vehicle, the slide frame 19 in the first inclined state. In addition, the ladder frame 14 connected thereto can be stably supported. For this reason, it is possible to smoothly carry the ladder 13 in the first inclined state.

  Further, in the above ladder lifting device, the guide frame 12 is provided with the speed reduction device 22 for reducing the moving speed of the slide frame 19 to the vehicle rear side, so that the ladder frame 14 can be smoothly moved to the vehicle rear side. be able to. Of course, the speed reduction device 22 is also effective in ensuring safety for the operator.

  Further, in the above ladder elevating device, the ladder frame 14 is provided with a lock device 24 that integrally fixes the slide frame 19 to the ladder frame 14, so that the switching from the first inclined state to the second inclined state can be performed. It can be done smoothly. Normally, it is assumed that two workers handle the ladder 13 in the first inclined state. However, when one worker inevitably handles the ladder 13, the locking device 24 is released to shift to the second inclined state. It ’s fine.

  In the above-described embodiment, the case where the vehicle is a rescue work vehicle has been described. However, in the present invention, the type of the target vehicle is not limited, and can be applied to various vehicles that need to transport a ladder. It is. In particular, the ladder lifting device according to the present invention is effective in a rescue work vehicle.

DESCRIPTION OF SYMBOLS 1 Vehicle 11 Mount 12 Guide frame 13 Ladder 14 Ladder frame 17 Gripping device 18 Handle 19 Slide frame 20 Rotating shaft 21 Guide roller 22 Deceleration device 23 Slide rail 24 Lock device 25 Switch 26 Lever 27 Support roller 28 Support body

Claims (3)

A ladder having a pedestal installed at the top of the vehicle, a guide frame extending along the gantry in the front-rear direction of the vehicle, and a ladder frame mounted with the ladder and movably installed along the guide frame In the lifting device, a slide frame extending toward the front side of the vehicle is slidably connected to the middle portion of the ladder frame in the longitudinal direction with respect to the ladder frame, and the slide frame is connected to the guide frame. A locking device for engaging and fixing the slide frame to the ladder frame integrally with the ladder frame; and a switch for opening and closing the locking device is provided on the ladder frame. Ladder lifting device.   2. The ladder lifting apparatus according to claim 1, wherein a support for supporting the slide frame is provided at a rear end portion of the gantry in a state where the ladder frame is moved to the rearmost side of the vehicle.   The ladder raising / lowering device according to claim 1, wherein the guide frame is provided with a speed reducer that reduces a moving speed of the slide frame toward the vehicle rear side.

Images