JPH0649588Y2 - Aerial work platform for fire fighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an aerial work vehicle for fire fighting, which has a work basket at the end of a boom and is used for fire extinguishing and rescue.

[Conventional technology]

As an aerial work vehicle for fire fighting, in Japanese Utility Model Publication No. 39-10780,
A foldable work basket is disclosed that includes a lower frame that is pivotally attached to the end of the boom in a balanceable manner and an upper fence that is pivotally attached to the lower frame so as to be able to stand and fall.

In this aerial work vehicle, the work basket can be easily placed in a low position during normal traveling, garage carry-in, and the like, and the overall height can be kept low.

[Problems to be solved by the device]

However, in the conventional aerial work vehicle, it is necessary for the worker to manually raise the upper fence of the work basket when arriving at the destination, and this is the case where the work basket is assembled during an emergency such as fire extinguishing or rescue. There were problems such as not being able to respond promptly in a safe and reliable manner.

The object of the present invention is to easily arrange the work basket at a low position and keep the overall height low during normal traveling, carrying in a garage, etc., and moreover, ensure that the upper fence of the work basket is safe and secure when arriving at the destination. It is an object of the present invention to provide an aerial work vehicle for fire fighting, which can be put upright and can be quickly assembled in response to an emergency such as fire extinguishing or rescue.

[Technical means for solving the problem]

A fire aerial work vehicle according to the present invention has a work basket consisting of a lower frame pivotally attached to a boom end in a balanced manner, and an upper fence pivotably attached to the lower frame so as to be able to stand and fall, and an outrigger device. In the equipped aerial work vehicle for fire fighting, a fence drive means for swinging the upper fence with respect to the lower frame is provided, and the fence drive means automatically raises the upper fence in conjunction with the overhanging operation of the outrigger device. It is characterized by having done.

The boom includes telescopic and refraction ladder bodies and rail-shaped bodies. For the balance control for horizontally holding the lower frame on the end of the boom, a known balance holding device used for a conventional work basket can be appropriately adopted. In addition, it is preferable that the work vehicle includes an inclination correcting device that always keeps the boom base horizontally regardless of the inclination angle of the vehicle body.

The fence drive means is a drive link whose base is pivotally attached to the lower frame, and the end is pivotally attached to the end of the drive link.
A four-bar linkage formed by an intermediate link whose base is pivotally attached to the upper fence, a follower link composed of the upper fence, and a fixed link composed of the lower frame, and a lower link that is provided on the lower frame and has a driving link above it. It may be composed of an actuator that swings within a range in which the fence stands and falls. The actuator may be, for example, a clevis-shaped cylinder, and a mechanism in which the head side of the cylinder is pivotally attached to the lower frame and the rod side is pivotally attached to the drive link or a swinging member interlocking with the drive link can be adopted.

It is preferable that the aerial work vehicle includes a fence lock device that automatically locks the upper fence so as not to swing when the upper fence is erected. The fence lock device is, for example, a guide member fixed to a lower frame, is guided by the guide member so as to be movable in the axial direction, and is biased toward the end portion of the guide member via a spring, and the upper fence is attached to the end portion. A slider having a cam follower at the base and a cam that is in contact with the cam follower, and a linear movement that interlocks with the swing of the upper fence. The cam drive means for displacing the guide member in the end direction or the base direction according to the standing state and the non-standing state of the guide member and for arranging the stopper in the position to engage with the upper fence or to separate from the upper fence, respectively. It may be one.

[Action]

In the above configuration, when the fence drive means is activated,
The upper fence swings with respect to the lower frame and stands or falls. It is preferable that the upper fence be collapsed in a direction that does not extend the entire length of the aerial work vehicle. The upper fence is in an upright state when the work basket is in use, and in an upright state when the work basket is not in use, that is, when the work basket is normally traveling or when the garage is loaded. The upper fence is
For example, a parallel link mechanism using the lower frame as a fixed link can be preferably adopted on the swing side surface.

The fence driving means causes an upright operation in conjunction with the overhanging operation of the outrigger device, so that the upright operation of the upper fence is automatically performed almost in parallel with the positioning and stabilizing operation of an aerial worker by the outrigger device.

In the fence drive means composed of the four-bar linkage mechanism and its actuator as described above, when the driving link is swung by the actuator, the upper fence forming the driven link is moved to the lower frame forming the fixed link. It swings and becomes upright or lying down.

In the aerial work vehicle provided with the fence lock device as described above, the fence lock device is actuated at the same time as the upper fence is in an upright state, and the upper fence is fixed so as not to be swingable. In addition, when the upper fence is in a non-standing state,
The fence lock device is released and the upper fence is swingably released.

As described above, when the fence lock device is composed of the guide member, the slider, the cam, and the cam drive means, the cam drive means gives the cam a rectilinear motion linked with the swing of the upper fence, so that the rectilinear motion of the cam is prevented. , The slider is displaced along the guide member via the cam follower in the end direction or the base direction of the guide member. The stopper engages the upper fence when the upper fence is in the upright state, and the stopper disengages from the upper fence when the upper fence is in the non-upright state.

〔Example〕

1 is a side view of an essential part of an embodiment of the present invention, FIG. 2 is a plan view of an essential part of a lower frame shown in FIG. 1, FIG. 3 is a sectional view taken along the line II in FIG. 2, and FIG. , FIG. 5, FIG. 6 and FIG.
The figures are front view, plan view, side view and rear view of the work basket shown in FIG. 1, and FIG. 8 is II in FIG.
It is a II line enlarged sectional view.

As shown in FIG. 1, an aerial work vehicle for fire fighting (1) is provided with a telescopic ladder (2) as a boom and a jack outrigger device (3), and two wedge-shaped gyro tables are rotatably combined. Known tilt correction device (4)
Is provided at the base of the telescopic ladder (2), and the work basket (5) is provided at the end of the telescopic ladder (2). It should be noted that illustrations and explanations of other accessories that are normally included in the aerial work vehicle (1) and which are not directly related to the present invention will be omitted.

The action basket (5) is composed of a lower frame (6) and an upper fence (7) pivotally attached to the lower frame (6) so as to be able to stand up and down, and the upper fence (7) is attached to the work basket (5). When not in use, that is, when traveling normally or when loading a garage, the lower frame (6) is laid down on the side of the telescopic ladder (2), and the work basket (5)
When using, that is, when working at a high place such as fire extinguishing or rescue, it is put upright with respect to the lower frame (6).

As shown in FIGS. 2-3, 4 and 6, the lower frame (6) has an upper opening, a floor plate (8) is laid on the bottom, and a perforated plate (9) is attached to the side surface. It has a shallow rectangular box shape, and a pair of support brackets (10) are provided on the back surface of the lower frame (6) so as to project in parallel in the front-rear direction, and each pair of front brackets (11) and rear brackets (12). Are projectingly provided at the front and rear ends of the lower frame (6) so as to extend in the front and rear of each support bracket (10).

The upper fence (7) has a rectangular tubular shape including a large number of parallel link mechanisms. First, the columns (13) are provided at the respective corners of the lower frame (6), and the intermediate columns (14) are provided at the front bracket (11).
And the rear bracket (12) via the support pins (15), respectively. The front strut (13) and the middle strut (14) and the rear strut (13) and the middle strut (14) have a common circuit. It can swing back and forth around the axis. In addition, the backing plate (1
6) attach each rear bracket (12) to each rear intermediate post (1
Projected to face the rear surface of the base of 4), which prevents the upper fence (7) from rocking forward beyond the standing position. A torsion spring (not shown) is attached to the support pin (15) of each front strut (13), which constantly biases the upper fence (7) in the rearward laying direction.

Further, the adjustment rod (17) is pivotally attached via a pin (19) to a bracket (18) projecting from the upper rear surface of the support pin (15) of each of the front intermediate columns (14), and a long hole ( 20) protrudes from the end of the adjusting rod (17). The length of the adjusting rod (17) can be adjusted by a bolt (21) and a nut (22). Further, a lock groove (23) is bored in the front surface of the base of each rear intermediate column (14).

As shown in FIGS. 4 to 7, the square frame-shaped handrails (24) are oriented in parallel with each other, and the pins (25) are attached to the respective ends of the front and rear columns (13) and the intermediate columns (14). It is pivotally attached to each of the front columns (13) and the middle columns (14) and the rear columns (1).
3), the intermediate support (14), and the square frame-shaped handrail (24) constitute a parallel link mechanism together with the lower frame (6). In addition, the rod-shaped handrail (26) is pivotally attached to each of the front and rear columns (13) on each side surface of the upper fence (7) through the pins (27) in two stages at each end thereof, and each column (13) is supported. ) Together with the parallel link mechanism. Also, another rod-shaped handrail (28) has an upper fence (7) at each end thereof.
The three columns are fixed to the adjacent columns (13) and the intermediate columns (14) on the front and rear surfaces of the vehicle in parallel three steps, and the gaps between the front intermediate columns (14) and the rear intermediate columns (14) are respectively different. Configure the gate of 5).

A fixed step (29) is secured to each front bracket (11) at each end thereof, a ladder-like lifting step (30)
Is attached to the front gate so that it can be opened and closed. The lifting step (30) that doubles as the front door is
The support pins (15) of the intermediate support columns (14) are pivotally attached to the lower ends of the front intermediate support columns (14) so as to be swingable in the front-rear direction, and when the gate is closed, the elevating step (30) is performed in the middle. Well-known step lock device (31) fixed to the column (14)
Is provided on the upper part of each intermediate column (14).

On the other hand, the rear door (32) is attached to the rear gate so that it can be opened and closed. The rear door (32) is a pair of lateral side pivotally mounted to one of the rear intermediate columns (14) pivotally via bolts (33) in a plane parallel to the plane passing through both intermediate columns (14). It is composed of a crosspiece (34) and a vertical crosspiece (36) pivotally attached to them through a pin (35). The horizontal crosspieces (34) and the vertical crosspieces (36) are parallel link mechanisms together with the intermediate support (14). Make up. Crossing (37)
Is provided on the other intermediate column (14) so as to stop and hold the end of each horizontal rail (34), and the handle (38) is provided so as to project near the end of the upper horizontal rail (34), and when the gate is closed. A rear door locking device (not shown) for fixing the end of the upper horizontal rail (34) in the corresponding rail receiver (37) is provided. In addition,
The rear door (32) may be of a double door type that can be closed when the upper fence (7) falls down.

Further, as shown in FIGS. 1 and 6, the rear ends of both support brackets (10) are pivotally attached to the ends of the expandable ladder (2) so as to be swingable in a vertical plane via support pins (39). , The head side and rod side of the clevis type balanced hydraulic cylinder (40), which is an actuator of the balance holding device, are pivoted to the lower end of the expansion ladder (2) and the front end of one of the support brackets (10) via cylinder pins (41) respectively. It is worn.

By operating the equilibrium hydraulic cylinder (40) in the above configuration, the inclination angle of the lower frame (6) with respect to the end of the telescopic ladder (2) can be freely adjusted.

As shown in FIGS. 2 to 3, the drive shaft (42) is supported by both front brackets (11) via the bearings (43), and the arms (44) are located outside the front brackets (11). Pins (45) fixed to the drive shaft (42) adjacent to each other, and the ends of the arms (44) pass through the slots (20) at the ends of the corresponding adjustment rods (17).
Arm (44), which is pivotally connected via
The adjustment rod (17) as an intermediate link, the front intermediate column (14) as a driven link, and the front bracket (11) or the lower frame (6) as a fixed link constitute a four-bar linkage mechanism. In addition, the drive arm (46) is fixed to the drive shaft (42) adjacent to the inside of one front bracket (11), and the head side and the rod side of the clevis-type electric cylinder (47) which is an actuator support correspondingly. They are pivotally attached to the inside of the bracket (10) and the end of the drive arm (46) via cylinder pins (48). Electric cylinder (4
The extension operation of 7) is automatically controlled so as to interlock with the extension operation of the jack outrigger device (3). The four-bar linkage, the drive shaft (42), the drive arm (46) and the electric cylinder (47) cooperate with each other to form fence drive means.

When the electric cylinder (47) is extended or contracted with a predetermined stroke in the above configuration, the arm (44) swings backward or forward through the drive arm (46) and the drive shaft (42), respectively, and at the same time. The front intermediate column (14) swings forward or backward via the adjusting rod (17), so that the entire upper fence (7) stands or falls with respect to the lower frame (6), respectively. The long hole (20) is provided at the pivotal connection between the arm (44) and the adjusting rod (17) in the four-bar linkage.
Is provided, and the play effectively absorbs the load applied to the fence driving means by the vertical movement of the upper fence (7) when the upper fence (7) is prone.

Further, as shown in FIGS. 2 to 3 and 8, a tubular body (49) as a guide member is fixed to the outside of each rear bracket (12) so as to face the lower end of each intermediate column (14), The (50) is inserted into each tubular body (49) via the spring (51) so as to be biased toward the end thereof. A stopper (52) is formed at the upper end of each slider (50), and a U-shaped groove (53) is bored at the lower end of each slider (50) in the front-rear direction.
A pin (54) as a cam follower is supported at the lower end of each U-shaped groove (53). The cam (55) is inserted in each U-shaped groove (53) so as to be straight and swingable, the cam rod (56) is extended forward of the cam (55), and the lower side of the cam (55) is a pin (54).
And the upper side of the cam (55) is pressed against the lower end of the tubular body (49) by the urging force of the spring (51).
The lower side is formed in an inclined step shape by a narrow portion (57), a wide portion (58), and an inclined portion (59) sandwiched between them. Further, a cam drive arm (60) is fixed to each end of the drive shaft (42), and each cam drive arm (60) end is pivotally attached to a corresponding cam rod (56) end via a pin (61). Has been done.

When the pin (54) comes into contact with the narrow portion (57) of the lower side of the cam (55), the slider (50) is located at the upper limit with respect to the tubular body (49), and the stopper (52) is located at the rear intermediate position. It engages the lock groove (23) of the column (14) and the pin (54) is the cam (55).
When contacting the wide part (58) of the lower side, the slider (50)
Is located at the lower limit with respect to the tubular body (49), and the stopper (52) separates from the lock groove (23). The cam rod (56), the cam drive arm (60), the drive shaft (42), the drive arm (46) and the electric cylinder (47) cooperate to form a cam drive means, and the cylinder body (49). ), Sly (5
0), the cam (55) and the cam driving means cooperate to form a fence lock device.

Electric cylinder (47) as above in the above configuration
When the upper fence (7) is erected or laid down while extending or contracting with a predetermined stroke, the drive arm (4
6), the cam rod (56) and the cam (55) oscillate through the drive shaft (42) and the cam drive arm (60) in sequence, and perform a rectilinear motion forward or backward with a predetermined stroke, and the cam (55). The stopper (52) engages with the lock groove (23) and fixes the rear intermediate strut (14) to the lower frame (6) only when it is most advanced, that is, when the upper fence (7) is erected.

[Effect of device]

As described above, in the aerial work vehicle for fire fighting according to the present invention, it is possible to easily arrange the work basket at a low position and keep the overall height low during normal traveling or loading into the garage. It is excellent and can easily run on roads with limited height without detouring, and can contribute to quick fire extinguishing and rescue. Moreover, in this aerial work vehicle, the standing up operation of the fence drive means is linked with the overhanging operation of the outrigger device, so that the upper fence of the work basket can be safely and surely erected when the work basket arrives at the destination. It can be quickly assembled in response to an emergency such as fire extinguishing or rescue.

If the fence driving means is composed of the four-bar linkage and its actuator, the upper fence can be swung easily and effectively.

Furthermore, if the aerial work vehicle is equipped with a fence lock device, it prevents shaking and rattling of the standing upper fence, stabilizes the upper fence, and improves workability such as fire extinguishing and rescue in the work basket. Improve.
In the case where the fence lock device is composed of the guide member, the slider, the cam and the cam drive means, the operation of the fence lock device is given through the cam mechanism which interlocks with the swing of the upper fence, so that the operation is reliable and the structure is Is simple.

[Brief description of drawings]

1 is a side view of an essential part of an embodiment of the present invention, FIG. 2 is a plan view of an essential part of a lower frame shown in FIG. 1, FIG. 3 is a sectional view taken along the line II in FIG. 2, and FIG. , FIG. 5, FIG. 6 and FIG.
The figures are front view, plan view, side view and rear view of the work basket shown in FIG. 1, and FIG. 8 is II in FIG.
It is a II line enlarged sectional view. [Explanation of main symbols] 2 ... Telescopic ladder, 3 ... Jack outrigger device, 5 ...
Work basket, 6 …… Lower frame, 7 …… Upper fence, 13 …… Post, 14 …… Intermediate post, 17 …… Adjusting rod, 23…
… Lock groove, 40 …… Balanced hydraulic cylinder, 42 …… Drive shaft, 44
...... Arm, 46 ...... Drive arm, 47 ...... Electric cylinder, 49
…… Cylinder, 50 …… Slider, 51 …… Spring, 52 …… Stopper, 55 …… Cam, 56 …… Cam rod, 60 …… Cam drive arm

Claims (4)

[Scope of utility model registration request] 1. A high place for fire fighting having a work basket comprising a lower frame pivotally attached to a boom end portion in a balanced manner and an upper fence pivotably attached to the lower frame so as to be able to stand and fall, and having an outrigger device. In the work vehicle, a fence drive means for swinging the upper fence with respect to the lower frame is provided, and the fence drive means automatically raises the upper fence in conjunction with the overhanging operation of the outrigger device. Aerial work vehicle for fire fighting. 2. The fence driving means comprises a driving link whose base portion is pivotally attached to a lower frame, an intermediate link whose end portion is pivotally attached to an end portion of the driving link, and an intermediate link whose base portion is pivotally attached to an upper fence, and an upper fence. A four-link mechanism formed of a fixed link composed of a driven link and a lower frame, and an actuator provided on the lower frame and swinging the driving link within a range where the upper fence stands up and falls. The aerial work vehicle for fire fighting according to claim 1. 3. The aerial work vehicle for fire fighting according to claim 1, further comprising a fence lock device for automatically fixing the upper fence so as not to swing when standing upright. 4. A fence lock device is guided by a guide member fixed to a lower frame, and movably in the axial direction by the guide member, and is urged toward the end portion of the guide member via a spring so that the end portion is A slider having a stopper engageable with the upper fence and a cam follower at the base, a cam abutted on the cam follower, and a linear movement that is interlocked with the swing of the upper fence to the cam. Drive means for displacing the stoppers in the end direction or the base direction of the guide member according to the standing state and the non-standing state of the upper fence and arranging the stoppers in the positions engaging with the upper fence or separating from the upper fence, respectively. The aerial work vehicle for fire fighting according to claim 3, comprising: