JP5916519B2 - Outrigger device in aerial work equipment - Google Patents

Description

The present invention relates to an outrigger device in an aerial work device such as a stepladder, a ladder, or a work table.

Conventionally, stepladders, ladders, work tables, and other high-altitude work devices (hereinafter simply referred to as “high-high work devices”) are configured so as to be stably installed on the ground. If there is a risk of personal injury if it falls due to the movement of the center of gravity or other causes, it has been proposed that an outrigger device is attached to the support column of an aerial work device.

JP 2004-131971 A Japanese Patent No. 4035486

Such an outrigger device includes an auxiliary leg that can be expanded to the side of a support column of an aerial work device. Therefore, the auxiliary leg can be closed along the support column when not in use, and is used by opening the leg as necessary.

In general, an opening / closing mechanism that can open and close an auxiliary leg is provided with an arm between a column-side member including the column and the auxiliary leg, and both ends of the arm are pivotally connected to the column-side member and the auxiliary leg, respectively. Thus, a foldable link mechanism is configured. At this time, the arm is preferably stored so as to overlap the pillar side member and the auxiliary leg when the auxiliary leg is closed.

By the way, when the arm is freely rotatable with the auxiliary leg closed, there is a risk that the auxiliary leg will accidentally open from the closed leg when transporting an aerial work device, etc. There is a risk of injury to nearby people. In addition, if the arm is freely rotatable with the auxiliary leg open, the auxiliary leg may accidentally close from the open leg when working at height, and the work equipment at the height may fall over. There is danger. Therefore, it is desirable that the auxiliary leg opening / closing mechanism is provided with a locking device that locks the auxiliary leg so that it cannot be opened and closed in the closed leg state and / or the open leg state.

However, for example, when the locking device is configured to insert and remove the lock pin, the operator needs to insert the lock pin continuously after opening and closing the auxiliary leg. Further, in order to open and close the auxiliary leg from the state in which the lock pin is inserted, it is necessary to pull out the lock pin prior to the opening and closing operation. Similarly, in the case of a locking device provided with an engagement / disengagement means other than the lock pin, it is necessary to operate the locking device itself separately from the opening / closing operation of the auxiliary leg. Therefore, there is a problem that the work is complicated and time and labor are wasted.

The main subject of this invention is providing the outrigger apparatus which enabled it to perform opening and closing of an auxiliary leg, and a locked state of a closed leg state and / or an open leg state by one-touch work. That is, the present invention provides a device in which, when opening and closing the auxiliary leg, the auxiliary leg is locked in the closed state simultaneously with completion of the closing leg operation, and the auxiliary leg is locked in the open leg state simultaneously with completion of the opening leg operation.

By the way, the high-altitude work device has a relatively low altitude work (hereinafter referred to as “low high altitude work”) and a relatively high altitude work (hereinafter referred to as “high altitude work”). It is convenient that the device can be selected by a single device. For this reason, a column (hereinafter referred to as a column) having a main leg and a telescopic leg that is telescopic from the lower end of the main leg. There is provided an altitude work device that is freely adjustable in height and is provided with "extensible struts".

Therefore, when the outrigger device is attached to the main leg of the telescopic strut in such an altitude working device that can be freely adjusted, the auxiliary leg that is opened from the outrigger device is suspended in the air when working at a high altitude with the telescopic strut extended. Do not ground. Therefore, like the telescopic strut, the auxiliary leg of the outrigger device needs to have a telescopic structure, which causes a problem of incurring high costs.

In addition, even if the auxiliary legs of the outrigger device have a telescopic structure, it is necessary to extend and retract the auxiliary legs of the outrigger device separately from the operation of expanding and contracting the telescopic support column of the aerial work device at the work site. There is a problem that the installation work of the work equipment is complicated and wastes time and labor.

The present invention provides an outrigger device that can be easily mounted on a height-adjustable working device with a telescopic support in addition to the main problem or separately from the main problem. When the arm is extended, the outrigger device follows and moves to the extended position, and when the auxiliary leg is opened in this state, it is possible to contact the ground, and when the telescopic column is contracted, the outrigger device follows and contracts to the contracted position. It is an object of the present invention to provide an apparatus that can be suitably grounded when the auxiliary leg is opened in this state.

Therefore, when the present invention is configured as a means for solving the above-mentioned main problem, the closed leg position along the column side member including the column of the working device for high places and the lower end portion are expanded to the side of the column side member. An auxiliary leg that can be opened and closed between the opened leg position, an opening / closing mechanism that allows the auxiliary leg to be opened and closed, and a lock mechanism that can lock the auxiliary leg to the closed leg position and the opened leg position. An outrigger device, wherein the opening / closing mechanism includes a rotatable upper arm and a lower arm that connect an auxiliary leg to the column side member so as to be openable and closable, and the upper arm has one end portion on the column side member by a first pivot. And the other end is pivotally connected to the auxiliary leg by the second pivot, and the arm posture from the first pivot to the second pivot is the closed leg posture P1 along the auxiliary leg in the upward posture when the auxiliary leg is closed. When the auxiliary leg is opened, It is comprised so that it may be set as the leg-opening attitude | position P2 along an auxiliary leg, The said locking mechanism is provided with the operating member provided in the auxiliary leg so that it can move between a locked position and an unlocked position, the said operating member, and the said upper side A closing leg locking means and an opening leg locking means for locking the arms so that they cannot rotate with respect to each other, and the closing leg locking means moves the operating member to the locked position with respect to the upper arm in the upwardly closed leg position; The locking mechanism is configured to release the locking when the operating member is moved to the unlocked position, and the opening leg locking means locks the operating member with respect to the upper arm in the downwardly opened leg position. When the operation member is moved to the unlock position, the lock is released.

In a preferred embodiment of the present invention, the upper arm is configured to be stored in an internal space of an auxiliary leg formed in a cross-sectional groove shape in a closed leg position and an open leg position, and the operation member includes: A grip member is slidably fitted to the upper end of the auxiliary leg, and is urged and urged upward along the auxiliary leg by the urging means, and the position moved upward is set as the lock position and moved downward. The first locking means and the second locking means are provided toward the upper arm, and the first locking means and the first leg when in the closed leg position are configured to be in the unlocked position. Closed leg locking means provided on the first wall portion of the upper arm facing the locking means constitutes closed leg locking means that is detachably engaged with each other through a window opening formed in the auxiliary leg, and the second The locking means and the second engagement when in the open leg position The open leg locking means provided on the second wall portion of the upper arm facing the device, constitute the open leg locking means for detachably locking to each other through the window opening.

At this time, an urging means for elastically urging the operation member upward along the auxiliary leg is provided, a stopper for stopping the urged operation means at the lock position is provided, and the first locking means and the second locking means are provided. When the upper arm rotates toward the closed leg position and the open leg position, the operating member becomes an urging means by rubbing each other. It is preferable to provide a guide portion made of an inclined surface that moves against the unlocked position.

Furthermore, in a preferred embodiment of the present invention, the first locking means and the second locking means are each a first locking claw protruding from the operation member into the auxiliary leg through a window opening formed in the auxiliary leg. And the closing leg locking means and the opening leg locking means are formed by a closing leg locking hole and an opening leg locking hole formed in the first wall portion and the second wall portion of the upper arm, respectively. Each of the closed leg locking hole and the open leg locking hole is formed with a locking portion by an edge portion facing the biasing direction of the operating member, and the first locking claw and the second locking hook are formed on the locking portion. It is comprised so that a pawl may be latched.

Further, in the present invention, as a means for solving the above-mentioned another problem, the column-side member constitutes a support column having a main leg and a telescopic leg that can be expanded and contracted from a lower end of the main leg, and the outrigger device includes: The support member attached to the support column is provided with an auxiliary leg via the opening / closing mechanism, and the support member is movably connected in the longitudinal direction of the main leg between the main support member and the support member. And a connecting means for connecting the extendable leg of the support column and the support member to each other, and the support member is configured to move along with the extension / contraction movement of the extendable leg.

In this case, the slide guide mechanism can be provided between a fixing member fixed to the main leg of the support column and a support member.

According to the first aspect of the present invention, the upper arm 8a of the opening / closing mechanism 9 is rotated between the upward closed leg posture P1 and the downward open leg posture P2 in accordance with the closed leg position and the open leg position of the auxiliary leg 10. Since the auxiliary leg 10 is expanded from the closed leg position to the open leg position, the auxiliary leg 10 moves downward along with the expansion rotation, so that the lower end of the auxiliary leg 10 is placed on the grounding surface. The outrigger device 6 contributes to the expected safety.

At this time, in accordance with the change in the posture of the upper arm 8a as described above, the lock mechanism 26 including the closed leg lock means 29 and the open leg lock means 30 for locking the upper arm 8a and the auxiliary leg 10 so as not to rotate with each other is provided. When the operation member 27 is moved to the lock position L, the closed leg lock means 29 and the open leg lock means 30 are engaged, and when the operation member 27 is moved to the unlock position U, the closed leg lock means 29 and the open leg lock are engaged. Since the lock means 30 is unlocked, the closed leg or the open leg can be locked with one touch, and the operation member 27 is moved to the unlock position U from the locked state. Therefore, the auxiliary leg 10 can be closed or opened, so that the safety by the locking of the auxiliary leg 10 and a quick and easy opening / closing operation are possible.

According to the second aspect of the present invention, the operation member 27 constitutes the grip member 27a, and the urging means 28 for elastically urging the operation member 27 upward along the auxiliary leg 10 is provided. If the grip member 27a at the lock position L moved upward by the biasing means 28 is gripped and moved downward toward the unlock position U, the locking of the closed leg lock means 29 is released, and the auxiliary leg 10 continues to move downward. Therefore, there is an advantage in that the auxiliary leg 10 in the closed leg state can be unlocked and opened by a series of one-touch operations for moving the gripped grip member 27a downward.

Then, in the state of the closed leg posture P1 and the open leg posture P2, the upper arm 8a is stored in the auxiliary leg 10, and the first locking means 31 and the first locking means 31 of the operation member 27 constituting the closed leg lock means 29 and the open leg lock means 30 are provided. The two locking means 32, the closed leg locking means 36 and the open leg locking means 37 of the upper arm 8a are configured to be engaged and disengaged through the window opening 33 of the auxiliary leg 10, and the operation member 27 and the auxiliary leg 10 are engaged. Therefore, when the operating member 27 is moved, the operator's fingers are packed by the closed leg locking means 36 and the open leg locking means 37. It can be used safely without any danger.

According to the third aspect of the present invention, when the auxiliary leg 10 is closed or opened, the operation member 27 elastically biased by the biasing means 28 is stopped at the lock position L by the stoppers 35 and 41. In this state, even when the upper arm 8a is rotated toward the closed leg posture P1 and the open leg posture P2, the operation member 27 is automatically moved to the unlock position U against the biasing means 28 by the guide portions 38 and 39. And when the pivoting to the closed leg posture P1 and the open leg posture P2 is completed, it automatically moves to the lock position L and locks the closed leg locking means 36 and the open leg locking means 37. It becomes possible to automatically lock the auxiliary leg 10 at the closed leg position and the open leg position.

According to the fourth aspect of the present invention, the first wall portion 20 and the second wall portion 21 of the upper arm 8a with respect to the first locking claw 31 and the second locking claw 32 provided on the operation member 27. Since the closed leg locking means 36 and the open leg locking means 37 can be formed by a simple structure in which the closed leg locking hole 36 and the open leg locking hole 37 are formed in the base, it can be easily manufactured and provided at low cost. become.

According to the present invention described in claim 5 and claim 6, when the column 4 of the high working place apparatus 1 is extended and contracted in order to cope with the low level high place work and the high place high place work in the work site, the post 4 The outrigger device 6 can be automatically moved to a predetermined position simply by expanding and contracting, and if the auxiliary leg 10 is opened in this state, the expanded lower end of the auxiliary leg 10 can be suitably grounded. This has the effect of being able to work at high altitudes safely.

It is a front view which shows the state which contracted the expansion-contraction support | pillar regarding the aerial work apparatus provided with the outrigger apparatus which concerns on this invention. It is a front view which shows the state which extended the expansion-contraction support | pillar regarding the aerial work apparatus provided with the outrigger apparatus which concerns on this invention. It is a perspective view shown in the state which decomposed | disassembled one Embodiment of the outrigger apparatus which concerns on this invention. FIG. 5 is a perspective view showing an embodiment of the outrigger device according to the present invention, with a support member attached to a fixing member fixed to an expansion / contraction column through slide guide means, and an auxiliary leg and an arm disassembled. 1 is a perspective view showing an outrigger device according to an embodiment of the present invention with the outrigger device mounted on a telescopic column of an aerial work device and an auxiliary leg closed. It is a perspective view shown in the state which decomposed | disassembled the upper arm, the auxiliary leg, and the operation member regarding 1 embodiment of the opening / closing mechanism of the outrigger apparatus which concerns on this invention, and a locking mechanism. It is a vertical side view shown in the state where an auxiliary leg was closed concerning a 1st embodiment of the present invention. The cross section of the outrigger apparatus made into the closed leg state is shown regarding 1st Embodiment of this invention, (A) is the sectional view on the AA line of FIG. 7, (B) is the sectional view on the BB line of FIG. is there. The cross section of the outrigger apparatus made into the closed-leg state regarding 1st Embodiment of this invention is shown, (C) is CC sectional view taken on the line of FIG. 7, (D) is DD sectional view taken on the line of FIG. is there. It is a vertical side view which shows the state in which the closed leg locking means was locked regarding the locking mechanism of an outrigger apparatus. It is a vertical side view which shows the state by which the closed leg lock means was unlocked regarding the lock mechanism of an outrigger device. It is a vertical side view which shows the operation | movement which expands an auxiliary leg toward an open leg state from a closed leg state regarding 1st Embodiment of this invention. It is a vertical side view which shows the state by which the open leg locking means was locked regarding the lock mechanism of an outrigger apparatus. It is a vertical side view shown in the state which opened the auxiliary leg regarding 1st Embodiment of this invention.

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

<High work equipment>
FIGS. 1 and 2 show a stepladder 1a as an example of an aerial work apparatus 1, and the stepladder 1a includes a ladder-like leg 2 and is omitted from the top plate 3 although not shown. Thus, the pair of legs 2 and 2 are configured to be openable and closable in the approaching / separating direction in a face-to-face state, and each leg 2 is attached to a pair of support pillars 4 and 4 that are arranged in a substantially C shape in parallel. It is formed in a ladder shape. The support column 4 constitutes an extendable support column that includes a main leg 4a and an extendable leg 4b that is extendable from the lower end of the main leg 4a and can be fixed at the extension position, and is contracted as shown in FIG. Thus, the low-altitude work can be performed, and the high-high work can be performed in the extended state as shown in FIG. In the case of the illustrated example, a telescopic support column of a nested type is configured by slidingly inserting a telescopic leg 4b having a small cross-sectional shape into a main leg 4a having a large cross-sectional shape. However, the present invention is not limited to this.

<Outrigger device>
Therefore, the outrigger device 6 of the present invention is mounted on the outer surface of at least one of the columns 4 and 4. In the case of the illustrated embodiment, the outrigger devices 6 and 6 are attached to both the columns 4 and 4, respectively. Although the drawings illustrate a stepladder 1a as the aerial work device 1, the outrigger device 6 of the present invention is a variety of aerial work devices provided with telescopic columns such as a ladder and a work table in addition to a stepladder. It should be understood that it can be attached arbitrarily.

Moreover, although the outrigger apparatus 6 provided with the slide guide mechanism 11 mentioned later is mounted | worn with and used for the expansion-contraction support | pillar 4 of the aerial work apparatus 1, this invention does not make the slide guide mechanism 11 an essential requirement. . Therefore, it should be appreciated that the slide guide mechanism 11 is not necessary when the outrigger device 6 of the present invention is mounted on the aerial work device 1 having a non-stretchable column.

<Opening and closing mechanism>
In one embodiment shown in the drawings, the outrigger device 6 is provided with a support member 7 attached to the support column 4 and an opening / closing mechanism 9 constituted by an upper arm 8a and a lower arm 8b with respect to the support member 7. And an auxiliary leg 10 connected to be freely opened and closed.

In the case of the illustrated embodiment, the opening / closing mechanism 9 is provided between the support member 7 and the auxiliary leg 10 in order to provide the slide guide mechanism 11 described later, but the present invention does not require the slide guide mechanism 11 as an essential requirement. . Therefore, when the present invention is applied to the high work apparatus 1 that does not have a slide mechanism, the opening / closing mechanism 9 can be directly attached to the column 4. In short, the column side member 4P including the column 4 and What is necessary is just to provide between the auxiliary legs 10. FIG. That is, the column side member 4P for attaching the opening / closing mechanism 9 may be the support column 4 or a member such as the support member 7 provided on the support column 4.

As shown in the figure, in the posture in which the outrigger device 6 is directed in the vertical direction together with the support column 4, the upper arm 8a is disposed on the upper portion of the outrigger device 6, and the lower arm 8b is disposed below the upper arm 8a. The closed leg position (indicated by a solid line in FIGS. 1 and 2) along which the auxiliary leg 10 is placed along the support member 7 and the open leg position where the lower end of the auxiliary leg 10 is widened to the side of the column 4 (FIG. 1). And (indicated by a chain line in FIG. 2). At this time, the upper arm 8a is formed to be shorter than the lower arm 8b, so that the opened auxiliary leg 10 has the lower end greatly expanded with the upper end close to the support member 7. An open tilted posture can be maintained.

<Slide guide mechanism>
In the case of the illustrated embodiment, a slide guide mechanism 11 is provided between the main leg 4a of the support column 4 and the support member 7 to connect the support member 7 movably in the longitudinal direction of the main leg 4a. A connecting means 12 for connecting the telescopic legs 4b and the support member 7 to each other is provided.

In the illustrated example, a fixing member 13 is fixed to the main leg 4 a of the support column 4, and a slide guide mechanism 11 is provided between the fixing member 13 and the support member 7. The fixing member 13 is composed of long rail members 14 and 14 fixed to both sides of the main leg 4a by fixing means such as bolts, and the support member 7 is a long member having a bottom wall 7a and both side walls 7b. It is comprised by the length-shaped groove-shaped member, and can each be formed with metal extrusion materials, such as aluminum.

A guide groove 15 and a guide rib 16 are provided on the upright portion of the rail members 14 and 14 constituting the fixing member 13 and the back side of the bottom wall 7a of the support member 7, and the fixing member 13 is fixed to the main leg 4a. In this state, when the guide groove 15 and the guide rib 16 are slidably fitted, the slide guide mechanism 11 is configured in which the support member 7 is movably connected in the longitudinal direction of the main leg 4a.

In the case of the illustrated embodiment, the guide groove 15 is provided on the rail members 14 and 14 and the guide rib 16 is provided on the support member 7. On the contrary, the guide groove 15 is provided on the support member 7 and the guide rib 16 is provided on the rail member 14. 14 may be provided.

Further, in the illustrated embodiment, the slide guide mechanism 11 is configured between the fixing member 13 and the support member 7, but the fixing member 13 is not necessary, and the main leg 4 a of the support column 4 and the support member 7 slide on each other. A guide groove and a guide rib that are movably fitted may be provided, and the slide guide mechanism 11 may be configured between the main leg 4 a of the support column 4 and the support member 7.

In the illustrated example, the connecting means 12 is composed of a metal plate piece 17 that is positioned at the lower end of the support member 7 and is fixed to the back side of the bottom wall 7a by fixing means such as bolts. The extended end portion 17 is fixed to the vicinity of the lower end of the telescopic leg 4b by fixing means such as a bolt. As shown by a chain line in FIGS. 1 and 2, the fixing position of the extendable leg 4b and the connecting means 12 is the lower end of the auxiliary leg 10 when the auxiliary leg 10 is opened with the lower end of the extendable leg 4b grounded. Is set to be a position that is expanded at a predetermined height position that can be grounded. However, it is a matter of course that the connecting means 12 is not limited to the configuration shown in the figure. For example, a wall portion formed integrally with the support member 7 without using a separate metal plate piece 17 as shown in the figure. May be connected to the telescopic legs 4b by fixing them with screws or the like.

Therefore, when the telescopic leg 4b is inserted into the main leg 4a in order to contract the support column 4, the support member 7 follows the telescopic leg 4b by the connecting means 12, and the slide guide mechanism 11 is moved as shown in FIG. Then, the support member 7 is moved to the side surface position of the main leg 4a.

On the contrary, when the telescopic leg 4b is pulled out from the main leg 4a in order to extend the support column 4, the support member 7 follows the telescopic leg 4b by the connecting means 12, and as shown in FIG. The support member 7 is moved to the side surface position of the telescopic leg 4b via

Therefore, when the operator expands / contracts the support column 4 of the high-altitude work device 1 in order to cope with the low-altitude work and the high-altitude work at the work site, the outrigger device 6 is automatically extended only by expanding and contracting the support column 4. Can be moved to a predetermined position.

<Embodiments of opening / closing mechanism and locking mechanism>
The auxiliary leg 10 has a groove portion 18a that opens toward the support member 7, is formed in a cross-sectional groove shape including both side walls 18b and 18b and a groove bottom wall 18c of the groove portion 18a, and is closed at a closed leg position. Thus, a compact leg closed state in which the support member 7 is covered and the both side walls 7b and 7b of the support member 7 are accommodated in the groove portion 18 is enabled. A grounding end tool 19 is fixed to the lower end of the auxiliary leg 10. Such an auxiliary leg 10 can be formed of a metal extruded material such as aluminum, and the end tool 19 can be formed of a synthetic resin.

The upper arm 8a constituting the opening / closing mechanism 9 is pivoted at one end by a first pivot 20 pivotally supported on both side walls 7b, 7b of the support member 7 and at the other end by an auxiliary leg 10. Are pivotally connected to the both side walls 18b, 18b by a second pivot shaft 21 pivotally supported. The arm posture of the upper arm 8a from the first pivot axis 20 toward the second pivot axis 21 is a closed leg posture stored along the groove portion 18a of the auxiliary leg 10 as an upward attitude when the auxiliary leg 10 is closed as shown in FIG. When the auxiliary leg 10 is opened as shown in FIG. 13, it is set to the open leg position P1 stored along the groove 18a of the auxiliary leg 10 as a downward attitude.

The arm 8a that is turned and rotated between the closed leg posture P1 and the open leg posture P2 includes a first wall portion 22 that faces the groove bottom wall 18c of the auxiliary leg 10 when the closed leg posture P1, and an open leg posture P2. The second wall portion 23 is provided so as to face the groove bottom wall 18c of the auxiliary leg 10 when it is done.

The lower arm 8b is pivoted at a position below the upper arm 8a by a first pivot 24 pivotally supported on both side walls 7b, 7b of the support member 7 and assists the other end. The leg 10 is pivotally connected to both side walls 18b, 18b by a second pivot 25 pivotally supported. The arm posture of the lower arm 8b from the first pivot axis 24 toward the second pivot axis 25 is stored along the groove portion 18a of the auxiliary leg 10 as an upward attitude when the auxiliary leg 10 is closed as shown in FIG. When the auxiliary leg 10 is opened as shown in FIG. 14, the posture is set to be expanded so as to intersect the auxiliary leg 10.

In the opening / closing mechanism 9 configured as described above, a lock mechanism 26 that can lock the auxiliary leg 10 in the closed leg position and the open leg position is provided. The lock mechanism 26 includes an operation member 27 provided on the auxiliary leg 10 so as to move between the lock position L and the unlock position U, and an urging force that urges the operation member 27 toward the lock position L. Means 28, and a closing leg locking means 29 and an opening leg locking means 30 for engaging the operating member 27 and the upper arm 8a with each other so as not to rotate are provided. The closed leg locking means 30 is engaged with the upper arm 8a in the upward closed leg posture P1 when the operating member 27 is moved to the lock position L by the urging means 28, and the operating member 27 becomes the urging means 28. When it moves against the unlocking position U against it, it is configured to release the locking. The leg opening lock means 30 is engaged with the upper arm 8a in the downward leg opening posture P2 when the operation member 27 is moved to the lock position L by the urging means 28, and the operation member 27 is urged. 28 is configured to release the lock when it moves to the unlock position U against 28.

In the illustrated embodiment, the operation member 27 constitutes a grip member 27a slidably fitted to the upper end portion of the auxiliary leg 10, and covers the groove bottom wall 18c and both side walls 18b, 18b of the auxiliary leg 10 from the outside. In this way, the base wall 27b and the side walls 27c, 27c are formed into a groove shape, and the first locking claw 31 and the second locking claw 32 extending from the base wall 27b into the groove are provided. Yes. In the case of the illustrated example, the first locking claw 31 is disposed on the lower side and the second locking claw 32 is disposed on the upper side with respect to the operation member 27 provided in the vertical direction along the auxiliary leg 10. .

On the other hand, as shown in FIG. 6, the auxiliary leg 10 has a window opening 33 in the groove bottom wall 18c, and the first locking claw 31 and the second locking claw of the crowned operation member 27. 32 is inserted through the window opening 33. At this time, notches 33a are formed on both side edges of the window opening 33, and protrusions 31a, 32a are provided on both sides of the first locking claw 31 and the second locking claw 32, and the protrusions 31a, 32a are When the operating member 27 is moved to the lock position L and the unlock position U after the first locking claw 31 and the second locking claw 32 are inserted into the window opening 33 by entering the notch 33a, It is preferable that the protrusions 31 a and 32 a overlap the both side edges of the window opening 33 at a position away from the notch 33 a, whereby the operation member 27 is assembled to the auxiliary leg 10 in an inseparable manner.

The window opening 33 is provided with a holding portion 34 extending from the lower edge portion to the inside of the window opening. The coil spring constituting the biasing means 28 is extrapolated to the holding portion 34 and the compressed coil spring is It elastically contacts the first locking claw 31 of the operation member 27. Accordingly, the operation member 27 is elastically biased upward along the auxiliary leg 10, and the second locking claw 32 is brought into contact with the upper edge portion of the window opening 33. Therefore, as shown in FIG. 10, the stopper 35 is configured by the upper edge portion of the window opening 33 of the second locking claw 32, and the position where the operation member 27 is stopped by the stopper 35 is the lock position L.

Accordingly, the upper arm 8a is provided with a closed leg locking hole 36 for receiving the first locking claw 31 in the first wall portion 22 facing the base wall 27b of the operation member 27 when the upper closed leg posture P1 is set, and is directed downward. An opening leg locking hole 37 for receiving the second locking claw 32 is provided in the second wall portion 23 facing the base wall 27b of the operation member 27 when the leg opening posture P2 is set.

As shown in FIG. 10, the closed leg locking hole 36 is configured to receive the first locking claw 31 when the upper arm 8a is in the upward closed leg position P1, and the operating member 27 is unlocked from the locked position L. When moved between the locking positions U, the first locking claws 31 are simultaneously moved inside the closed leg locking holes 36. Since the first locking claw 31 is provided with a guide portion 38 having a slope at the tip, when the upper arm 8a is rotated toward the upward closed leg posture P1 and stored in the auxiliary leg 10, the closed leg is locked. By sliding and rubbing the guide portion 38 on the locking portion 36a formed at the edge of the hole 36, the first locking claw 31 together with the operation member 27 moves backward toward the unlock position U against the biasing means 28. As soon as the guide portion 38 passes through the locking portion 36a and is moved to the lock position L by the biasing means 28, the claw portion of the first locking claw 31 is moved to the locking portion 36a. Lock. Thereby, the closed leg locking hole 36 and the first locking claw 31 constitute a closed leg locking means 29 that locks the closed auxiliary leg 10 and the upper arm 8a so that they cannot rotate relative to each other.

As shown in FIG. 13, the opening leg locking hole 37 is configured to receive the second locking claw 32 when the upper arm 8 a is in the downward opening leg position P <b> 2, and the operating member 27 is locked to the locking position L. And the unlocking position U, the second locking claw 32 is simultaneously moved inside the open leg locking hole 37. Since the second locking claw 32 is provided with a guide portion 39 that forms an inclined surface at the tip, when the upper arm 8a rotates toward the downward leg position P2 and is stored in the auxiliary leg 10, the leg is opened. By sliding and rubbing the guide portion 39 on the locking portion 37a formed at the edge of the locking hole 37, the second locking claw 32 together with the operating member 27 is directed to the unlock position U against the biasing means 28. As soon as the guide part 39 passes through the locking part 37a and is moved backward to the locking position L, the urging means 28 moves to the locking position L, and the second locking claw 32 is moved to the locking part 37a. Lock the nail part of. As a result, the opening leg locking hole 37 and the first locking claw 32 constitute an opening leg locking means 30 that locks the opened auxiliary leg 10 and the upper arm 8a so that they cannot rotate relative to each other.

<Effects of closed and open legs>
When the auxiliary leg 10 is closed, as shown in FIG. 7, the auxiliary leg 10 extends along the support member 7 and covers the support member 7, and the edges of the side walls 18 b and 18 b are aligned with the rail members 14 and 14. (See FIG. 9C).

In the closed leg state, the lower arm 8b is stored in the auxiliary leg 10 with the arm posture from the first pivot 24 toward the second pivot 25 as an upward posture. At this time, since the second pivot shaft 25 is positioned so as to cross both side walls 7b, 7b of the support member 7, a notch portion 7c for receiving the second pivot shaft 25 is formed on both side walls 7b, 7b of the support member 7. ing.

As shown in FIG. 10, the upper arm 8 a is stored in the auxiliary leg 10 while being rotated to the upward closed leg posture P <b> 1, and the first wall portion 22 faces the groove bottom wall 18 c of the auxiliary leg 10. . The operation member 27 is biased by the biasing means 28 and stopped at the lock position L by the stopper 35, and the closing leg locking means 29 configured by the first locking claws 31 and the closing leg locking holes 36 is moved. The auxiliary leg 10 and the upper arm 8a are locked so that they cannot rotate relative to each other, thereby holding the auxiliary leg 10 so that it cannot be opened.

At this time, the second pivot 21 of the upper arm 8a is positioned above the upper end of the support member 7, and both ends of the second pivot 21 penetrate the auxiliary leg 10 and slightly protrude from the side walls 18b and 18b. Correspondingly, receiving recesses 40 for receiving both ends of the second pivot 21 are formed on both side walls 27c, 27c of the operating member 27 (see FIG. 8A). The receiving recess 40 is formed to be large so that the operation member 27 can be moved between the lock position L and the unlock position U with respect to the second pivot 21 that penetrates the auxiliary leg 10. In the case of the illustrated embodiment, the stopper 41 for stopping the operation member 27 urged by the urging means 28 at the lock position L is configured by the edges of the receiving recess 40 coming into contact with both ends of the second pivot 21. doing. Therefore, as shown in the figure, the stopper is constituted by both the stopper 35 formed between the window opening 33 and the second locking claw 32 and the stopper 41 formed between the receiving recess 40 and the second pivot 21. However, it may be configured by either one.

In order to open the auxiliary leg 10 from this closed state, as shown in FIG. 11, the operator holds the grip member 27 a constituted by the operation member 27, and the operation member 27 is applied to the urging means 28. When it is pushed downward, the operating member 27 moves to the unlock position U, the claw portion of the first locking claw 31 is moved away from the locking portion 36a of the closed leg locking hole 36, and the closed leg locking means 29 is moved. Release the lock.

Therefore, when the force in the pressing direction is continued while holding the grip member 27a (or when a pulling force in a direction away from the support member 7 is applied), as shown by a chain line in FIG. 7, the first pivot 20 pivoted on the pivot 7 is pivoted, and the auxiliary leg 10 is moved along the pivotal trajectory of the second pivot 21. Accordingly, as shown in FIG. 12, the lower arm 8 b Is expanded, and the lower end of the auxiliary leg 10 is expanded.

Accordingly, the operator can expand the auxiliary leg 10 to the open leg position shown in FIG. 14 together with the development of the lower arm 8b. At this time, the upper arm 8a is stored in the auxiliary leg 10 as the open leg posture P2 shown in FIG. 13, engages the open leg lock means 30, and locks the auxiliary leg 10 and the upper arm 8a so that they cannot rotate relative to each other. Thus, the auxiliary leg 10 is held in the open leg state. In this way, the upper arm 8a changes its posture from the upward closed leg posture P1 to the downward open leg posture P2, and moves the position of the second pivot shaft 21 when the auxiliary leg 10 is pivoted together with the opened leg downward. The auxiliary leg 10 moves downward along with the expansion rotation, and brings the end tool 19 at the lower end of the auxiliary leg 10 closer to the ground contact surface.

When the auxiliary leg 10 is opened to the open leg position while the grip member 27a (operating member 27) held by the operator is held at the unlock position U, the upper arm 8a is rotated to the upward leg position P2. Then, since the second locking claw 32 is freely received in the opening leg locking hole 37, if the operating member 27 is released thereafter, the operating member 27 is moved to the lock position L by the urging means 28, and the opening leg is opened. The locking means 30 is locked.

When the operator does not hold the grip member 27a (operation member 27) and is positioned at the lock position L and opens the auxiliary leg 10 to the open position, the upper arm 8a is in the upward open leg position P2. When the second locking claw 32 is moved back toward the unlocked position U against the biasing means 28 by the locking portion 37a and the guide portion 39 of the opening leg locking hole 37 when being rotated. After entering the opening leg locking hole 37, the opening leg locking means 30 is locked by automatically moving to the lock position L by the biasing means 28.

In order to close the auxiliary leg 10 again from the closed leg state, when the operating member 27 is pushed downward against the biasing means 28 and moved to the unlock position U, the locking of the opening leg lock means 30 is released. Therefore, the auxiliary leg 10 may be closed while the lower arm 8b is closed. At this time, the upper arm 8a is stored in the auxiliary leg 10 as the closed leg posture P1 shown in FIG. 10, and the closed leg lock means 29 is engaged to lock the auxiliary leg 10 and the upper arm 8a so that they cannot rotate relative to each other. The auxiliary leg 10 is kept closed.

Also in this case, when the auxiliary leg 10 is closed to the closed position while the grip member 27a (operating member 27) gripped by the operator is held at the unlocked position U, the upper arm 8a rotates to the downward closed leg position P1. When it is moved, the first locking claw 31 is freely received in the closed leg locking hole 36. After that, if the operating member 27 is released, the operating member 27 is moved to the lock position L by the biasing means 28, and the closed leg lock is set. The means 29 is locked.

When the operator does not grasp the grip member 27a (operation member 27) but is positioned at the lock position L and closes the auxiliary leg 10 to the closed position, the upper arm 8a rotates toward the downward closed leg posture P1. When it is moved, the locking portion 36a of the closed leg locking hole 36 and the guide portion 38 cause the first locking claw 31 to retreat toward the unlocking position U against the urging means 28, thereby closing the closed leg locking hole. After entering 36, the urging means 28 automatically moves to the lock position L, thereby locking the closed leg lock means 29.

The present invention is not limited to the illustrated embodiment described above. For example, the operation member 27 is preferably provided with the urging means 28 as in the above embodiment, but the urging means 28 is not provided, and the manual operation is not performed. It may be configured to move to the lock position L. Further, the closed leg locking means 29 and the open leg locking means 30 are constituted by the first locking claw 31 and the second locking claw 32, the closed leg locking hole 36, and the open leg locking hole 37 in the above embodiment. However, it does not necessarily have to be a locking structure with a claw and a hole. In short, any structure may be used as long as the upper arm 8a is detachably locked so as not to rotate.

DESCRIPTION OF SYMBOLS 1 Work place 1a Stand 2 Leg 3 Top plate 4 (Extension | stretching) support | pillar 4P Support | pillar side member 4a Main leg 4b Expansion / contraction leg 5 Step rail 6 Outrigger device 7 Support member 7a Bottom wall 7b Side wall 7c Notch part 8a Upper arm 8b Lower arm 9 Opening / closing mechanism 10 Auxiliary leg 11 Slide guide mechanism 12 Connection fixing means 13 Fixing member 14 Rail member 15 Guide rib 16 Guide groove 17 Metal plate piece 18a Auxiliary leg groove 18b Auxiliary leg side wall 18c Auxiliary leg groove bottom wall 19 End tool 20 Upper arm first pivot 21 Upper arm second pivot P1 Upper arm closed leg position P2 Upper arm open leg position 22 Upper arm first wall 23 Upper arm second wall 24 Lower arm First pivot 25 Second pivot 26 of lower arm Lock mechanism 27 Operation member 27a Grip member 27b Base wall 27c of operation member Side wall 28 of operation member Lance means 29 Closed leg lock means 30 Open leg lock means 31 First locking claw 32 Second locking claw 31a, 32a Projection 33 Window opening 33a Notch 34 Holding part 35 Stopper 36 Closed leg locking hole 36a Locking part 37 Opening leg locking hole 37a Locking portion 38 Guide portion 39 Guide portion 40 Receiving recess 41 Stopper

Claims (6)

It can be freely opened and closed between a closed leg position along the column side member (4P) including the column (4) of the aerial work device and an open leg position where the lower end portion is expanded to the side of the column side member (4P). An auxiliary leg (10), an opening / closing mechanism (9) capable of opening and closing the auxiliary leg (10), and a lock mechanism (26) capable of locking the auxiliary leg (10) in a closed leg position and an open leg position. ) With an outrigger device,
The opening / closing mechanism (9) includes a rotatable upper arm (8a) and a lower arm (8b) that connect the auxiliary leg (10) to the column side member (4P) so as to be opened and closed.
The upper arm (8a) has one end pivoted to the column side member (4P) by the first pivot (20) and the other end pivoted to the auxiliary leg (10) by the second pivot (21). When the auxiliary leg (10) is closed, the arm position from the first pivot (20) to the second pivot (21) is the closed leg position (P1) along the auxiliary leg (10) in the upward position. ) Is configured to be in an open leg position (P2) along the auxiliary leg (10) in a downward attitude when
The lock mechanism (26) includes an operation member (27) provided on the auxiliary leg (10) to be movable between a lock position (L) and an unlock position (U), the operation member (27), and the A closed leg lock means (29) and an open leg lock means (30) for engaging the upper arm (8a) with each other so as not to rotate,
The closed leg lock means (29) is engaged with the upper arm (8a) in the upward closed leg position (P1) when the operating member (27) is moved to the lock position (L), and the operating member ( 27) is configured to release the lock when moved to the unlocked position (U),
The open leg locking means (30) is engaged with the upper arm (8a) in the downward open leg position (P2) when the operating member (27) is moved to the lock position (U), and is operated. An outrigger device in an aerial work device characterized in that it is configured to release the lock when the member (27) is moved to the unlock position (U). The upper arm (8a) is configured to be stored in the internal space of the auxiliary leg (10) formed in a cross-sectional groove shape in a closed leg position (P1) and an open leg position (P2),
The operating member (27) constitutes a grip member (27a) slidably fitted to the upper end portion of the auxiliary leg (10), and is directed upward along the auxiliary leg (10) by the biasing means (28). The position moved upward is set as the lock position (L) and the position moved downward is set as the unlock position (U), and the first locking toward the upper arm (8a) is made. Means (31) and second locking means (32) are provided,
The first locking means (31) and the closed leg locking means (36) provided on the first wall portion (22) of the upper arm facing the first locking means when in the closed leg posture (P1), A closed leg locking means (29) configured to be detachably engaged with each other through a window opening (33) formed in the auxiliary leg (10),
The second locking means (32) and the opening leg locking means (37) provided on the second wall portion (23) of the upper arm facing the second locking means when in the open leg position (P2) The outrigger device in an aerial work device according to claim 1, characterized in that it comprises an open leg lock means (30) for releasably engaging with each other via the window opening (33). . A stopper for stopping the operation member (27) biased to the lock position (L) by providing a biasing means (28) for elastically biasing the operation member (27) upward along the auxiliary leg (10). (35,41)
The upper arm (8a) is in a closed leg position (P1) between the first locking means (31) and the second locking means (32) and the closed leg locking means (36) and the open leg locking means (37). ) And the open leg posture (P2), the operating member (27) is moved toward the unlocked position (U) against the biasing means (28) by rubbing against each other. The outrigger device in an aerial work device according to claim 2, wherein a guide portion (38, 39) comprising a slope is provided. The first locking means and the second locking means are respectively a first locking claw protruding from the operating member (27) into the auxiliary leg through a window opening (33) formed in the auxiliary leg (10). (31) and the second locking claw (32),
The closing leg locking means and the opening leg locking means are respectively a closing leg locking hole (36) and an opening leg locking formed in the first wall portion (20) and the second wall portion (21) of the upper arm (8a). Composed of holes (37),
The closed leg locking hole (36) and the open leg locking hole (37) each form a locking portion (36a, 37a) by an edge portion facing the biasing direction of the operating member (27), The outrigger device for an aerial work device according to claim 3, wherein the first locking claw and the second locking claw are locked to the portion. The column side member (4P) constitutes a support post (4) including a main leg (4a) and an extendable leg (4b) which can be extended and contracted from the lower end of the main leg, and the outrigger device (6) An auxiliary leg (10) is provided on the support member (7) attached to the column via the opening / closing mechanism (9),
Between the main leg (4a) of the support column (4) and the support member (7), there is provided a slide guide mechanism (11) for movably connecting the support member in the longitudinal direction of the main leg, and the support column (4 ) And a support means (12) for connecting the support member (7) to each other, and the support member (7) is configured to move along with the extension / contraction movement of the extension / contraction leg (4b). The outrigger device in an aerial work device according to claim 1, 2, 3, or 4. The said slide guide mechanism (11) is provided between the fixing member (13) fixed to the main leg (4a) of the support | pillar (4), and a support member (7), An outrigger device in an aerial work device according to claim 1.

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