JP2018127851A - Outrigger device for high lift work device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outrigger device for a high lift work device.SOLUTION: A lock mechanism comprising latched means 27 and latching means 29, and a control mechanism 11 comprising operating means 31 and operated means 32 are configured mutually in an auxiliary leg 8 and a lock arm 9. When the lock arm in a storage attitude M1 holds the auxiliary leg in a closed attitude P1, the operating means 31 is abutted to the operated means 32 to hold the lock arm in the storage attitude M1 against a spring 25. When the auxiliary leg is opened, during rotation from the closed attitude P1 to an open attitude P2, the operating means 31 is abutted to the operated means 32 to inhibit rotation of the lock arm. In the open attitude P2, the operating means 31 passes over the operated means 32 for the first time to rotate the lock arm toward a locked attitude M2 by the spring 25, and the latching means 29 of the lock arm is latched to the standing-by latched means 27 of the auxiliary leg so as to be locked.SELECTED DRAWING: Figure 6

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.

JP2013-249612A JP 2013-177784 A JP 2005-42507 A

The outrigger device includes an auxiliary leg that is extended to the side of the column of the working device at the height, and the auxiliary leg can be closed along the column when not in use. Used by opening legs.

The closing and opening of the auxiliary leg is enabled by a foldable link mechanism formed between the support column and the auxiliary leg. At this time, the link mechanism overlaps the support column and the auxiliary leg when the auxiliary leg is closed. It is preferable that storage is possible.

However, when a link mechanism with a large number of parts and a complicated structure is provided to open and close the auxiliary legs, it not only incurs high costs, but also increases the overall weight of the aerial work equipment. Inconvenient.

Therefore, the auxiliary leg is pivoted with respect to the support so that it can freely rotate between a closed leg position in which the auxiliary leg is set upward along the support pole and an open leg position in which the leg is inverted from the closed leg position. It is desirable to construct, thereby providing a simple structure.

However, when providing an outrigger device, if the auxiliary leg in the open position is accidentally closed during high altitude work, there is a risk of the fall of the high position work apparatus. If the legs are inadvertently opened, there is a risk of injury to the transporter and neighbors, so it is important to provide a reliable posture lock device.

The posture lock device not only dislikes the operation of the operator when the operator requires a complicated operation in order to increase the reliability of the lock, but also may cause an incomplete lock state due to the incomplete operation. There is.

For this reason, it is desirable to provide a posture locking device that can be easily and easily locked and unlocked with a simple configuration as much as possible and can obtain a highly reliable locked state. There is a problem of the present invention.

Therefore, the present invention is configured as a means for solving the above-described problems, and is an outrigger device attached to the support column of an aerial work device, which constitutes an auxiliary leg, a lock arm, a lock mechanism, and a control mechanism. The auxiliary leg includes a leg portion extending from a pivot portion pivotally connected to the support column via a main shaft, and an upwardly closed leg position held along the support column, and a downward inclination away from the support column. The lock arm is configured to be freely rotatable between an open leg posture, which is a posture, and the lock arm includes an arm portion extending from a base portion that is pivotally connected to a support column via a pivot at a position below the main shaft toward a distal end portion. It is configured to be freely rotatable between a retracted position that is upward along the column and a locked position that is inclined upward and away from the column, and is attached from the retracted position toward the locked position. The spring The locking mechanism is constituted by a latching means provided on the leg portion of the auxiliary leg and a locking means provided on the arm portion of the lock arm, and the lock mechanism is provided with respect to the auxiliary leg in the open leg posture. The auxiliary mechanism is configured to lock the auxiliary leg in the open leg position by locking the locking means to the locked means when rotated toward the locking posture, and the control mechanism is configured to lock the locking arm. When the auxiliary leg is rotated toward the closed leg position with respect to the lock arm in the retracted position, the driven means is provided at the distal end portion and the operating means provided at the pivoting portion of the auxiliary leg. By being in contact with the driven means, the lock arm is configured to be held in the retracted position against the spring, and when the auxiliary leg is rotated toward the open leg position, the operating means is moved to the driven means. In contact with the When the arm is pushed against the spring and further rotated and the auxiliary leg is positioned in the vicinity of the open leg posture, the operating means gets over the driven means, so that the lock arm is moved to the locked position by the spring. It is in the point which comprises so that it may rotate.

In a preferred embodiment of the present invention, the actuating means is provided with a claw portion on the front side in the turning direction toward the open leg posture with respect to the radius of the rotation locus centering on the main shaft, and on the rear side in the turning direction. A release portion having a rotation trajectory having a radius smaller than that of the claw portion, and the driven means is provided with a locking portion on the front side in the rotation direction toward the lock posture with respect to the radius of the rotation trajectory centered on the pivot, A control unit having a rotation locus with a radius larger than that of the locking unit is provided on the rear side in the rotation direction, and when the auxiliary leg is rotated toward the closed leg position with respect to the lock arm in the retracted position, When the claw portion of the actuating means comes into contact with the locking portion of the driven means, the lock arm is held in the retracted position against the spring, and the auxiliary leg is rotated toward the open leg position The claw part of the operating means is in front When the locking arm is pushed against the spring in contact with the locking portion of the driven means, and the claw portion of the operating means gets over the locking portion of the driven means by the rotation, the operating means The release portion of the abutment comes into contact with the control unit of the driven means, so that the lock arm is prevented from rotating toward the locked posture by the spring, and the auxiliary leg is further rotated to be positioned in the vicinity of the open leg posture. When this is done, the release part of the actuating means gets over the control part of the driven means, so that the lock arm is rotated toward the lock posture by the spring.

The spring of the lock arm is configured to generate a resilient force when the lock arm is in the retracted position, but loses the resilient force when rotated by a predetermined angle from the retracted position toward the locked position. It is preferable.

A preferred embodiment of the present invention is provided with a holding mechanism that rotates the lock arm from the locked position toward the retracted position and holds the retained position when the lock arm is rotated to a position where the locked position is set to the retained position. The holding mechanism is provided with a holding member that is slidable up and down facing the lock arm in the retracted posture and is urged in the upward direction via a resilient means, and is provided on the holding member and the lock arm. The claw means and the lock receiving means are provided, respectively, and the pivoting portion and the holding member of the auxiliary leg are provided with a pressing means and a pressed member, respectively. When the pressing member is pressed to lower the holding member to a predetermined lowering position against the elastic member, and when the auxiliary leg is in the open leg position, the pressing member is released from the pressed member to release the holding member. means The locking claw means and the locking receiving means rotate the lock arm from the retracted position toward the holding position with the auxiliary leg in the open leg position. When the lock arm is rotated to the holding position, the contact is released and the holding member is raised to the holding position. The locking claw means is configured to be locked to the locking receiving means, and the pressing means and the pressed means rotate the auxiliary leg to the closed leg position while the lock arm holds the holding attitude. When the holding member is lowered to the lowered position, the locking claw means and the locking receiving means are unlocked, and the lock arm is rotated from the holding position to the retracted position by a spring.

According to the first to third aspects of the present invention, in the outrigger device in an aerial work device, when the auxiliary leg 8 held as the closed leg posture P1 when not in use is used as the open leg posture P2, the auxiliary leg 8 is Until the actuating means 31 comes into contact with the driven means 32 until the position close to the open leg position P2, the lock arm 9 is not rotated toward the lock position M2, and the auxiliary leg 8 is moved. Only when the actuating means 31 gets over the driven means 32 when the actuating means 31 gets over the position in the vicinity of the open leg position P2 has the effect that the lock arm 9 is rotated by the spring 25 toward the lock attitude M2.

For this reason, if the worker performs only the operation of rotating the auxiliary leg 8 from the closed leg posture P1 toward the open leg posture P2, the lock arm 9 automatically rotates toward the lock posture M2, and the arm portion. 23 is received by the latching means 27 of the auxiliary leg 8, and there is an advantage that the latching means 29 of the lock arm 9 can be easily and easily locked to the latching means 27 of the auxiliary leg 8.

According to the fourth aspect of the present invention, when the use of the outrigger device is finished and the lock arm 9 is set to the retracted posture M1, the lock arm 9 is simply rotated from the lock posture M2 to the holding posture MK. Since the holding posture MK can be held, the operator can easily turn the auxiliary leg 8 from the open leg posture P2 to the closed leg posture P1 by freely using both hands thereafter. Moreover, the lock arm 9 is automatically rotated from the holding posture MK to the retracted posture M1 simply by turning the auxiliary leg 8 from the open posture P2 to the closed leg posture P1 from that state. Since the storage posture M1 is held through the locking by the locking portion 36 of the 9 and the claw portion 33 of the auxiliary leg 8, the effect of being able to stand by as the storage posture M1 for using the outrigger device again is obtained. is there.

It is a perspective view showing an example of an aerial work device provided with an outrigger device according to the present invention. It is a perspective view which shows each member in an exploded state regarding 1 embodiment of the outrigger apparatus which concerns on this invention. It is a perspective view which shows the structure for fixing the unit stand of an outrigger apparatus to the support | pillar of an aerial work apparatus. It is a perspective view which shows the lock arm of the state assembled | attached to the unit base, and the auxiliary leg of the state before attaching to a unit base. It is a perspective view of the state which attached the lock arm and the auxiliary leg to the unit base. The outrigger device attached to the support work station is shown in the state where (A) is a sectional view of the lock arm in the retracted position and the auxiliary leg is in the closed position, and (B) is the auxiliary leg opened. It is sectional drawing of the state which set it as the leg posture and made the lock arm into the lock posture. It is a side view which shows the lock mechanism and control mechanism comprised between the auxiliary leg and the lock arm. The operation of the control mechanism is shown, (A) is a side view of the lock arm in the retracted position and the auxiliary leg is in the closed position, and (B) is the auxiliary leg rotated from the closed leg position to the open leg position. It is a side view of the state started. It is a side view of the state which showed the effect | action of a control mechanism and the auxiliary leg was further rotated toward the open leg attitude | position. The operation of the control mechanism and the lock mechanism is shown, (A) is a side view showing a state when the rotated auxiliary leg is positioned in the vicinity of the open leg posture, and (B) is the auxiliary leg in the open leg posture. It is a side view which shows the state locked by the locking mechanism. It is a side view which shows the method and effect | action for making a lock arm into a retracted position and making an auxiliary leg into a closed leg position. It is a perspective view which shows each member of an apparatus in an exploded state regarding the outrigger apparatus which provided the holding mechanism. The operation of the holding mechanism is shown. (A) is a partially sectional side view of the lock arm in the retracted position and the auxiliary leg in the closed position, (B) is a partially enlarged view, and (C) is the opened auxiliary leg. It is a partial cross section side view in the state where it was set as a leg posture and a lock arm was made into a lock posture. The operation of the holding mechanism is shown, (A) is a partially sectional side view of the state where the lock arm is rotated to the retracted position with the auxiliary leg in the open position, and (B) is the hold position of the lock arm from the retracted position. (C) is a partial cross-sectional side view of the state where the lock arm is rotated and held to the holding posture. The action of the holding mechanism is shown, (A) is a partial sectional side view of the state where the auxiliary leg is rotated toward the closed leg position with the lock arm held in the holding attitude, and (B) is the auxiliary leg to the closed leg position. It is a partial cross section side view of the state which canceled holding of a lock arm by rotating.

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

FIG. 1 shows a stepladder 1a as an example of an aerial work apparatus 1. The stepladder 1a includes a ladder-like leg 2 and is provided with a pivot means provided facing a top plate 3 at the top. The pair of legs 2, 2 are configured to be openable and closable in the approaching / separating direction in a face-to-face state, and each leg 2 is supported by a pair of support posts 4, 4 arranged substantially in a letter C shape. 5 is formed in a ladder shape.

Therefore, the outrigger device 6 of the present invention is mounted on a desired column 4 among the columns 4 and 4, that is, on the outer surface of at least one column 4. FIG. 1 shows only one strut 4 and the outrigger device 6 attached thereto by a solid line, and the others are shown by chain lines. Of course, the outrigger device may be attached to a desired strut if necessary. It is. Moreover, although the stepladder 1a is illustrated as the aerial work device 1, the outrigger device 6 of the present invention can be arbitrarily applied to various high work devices equipped with telescopic columns such as a ladder and a work table in addition to a stepladder. Further, the support 4 can be mounted, and it does not matter whether the support 4 is an extendable leg or a non-expandable leg.

The outrigger device 6 includes a unit base 7 attached to the column 4, an auxiliary leg 8 and a lock arm 9 assembled to the unit base 7, and a lock mechanism configured by the auxiliary leg 8 and the lock arm 9. 10 and the control mechanism 11 are configured.

The unit base 7 has a pair of upper brackets 13 and a pair of lower brackets 14 protruding from a base plate portion 12 provided on both sides with ear pieces 12a fitted into shallow grooves formed on the outer surface of the support column 4. A support piece 15 is protruded from the upper and lower intermediate positions of the bracket. Such a unit base 7 can be integrally molded by molding with synthetic resin, forging with metal or die casting.

In the case of the illustrated embodiment, as shown in FIG. 3, the column 4 of the aerial work apparatus 1 has a hollow cylindrical traverse 5 fixed in a penetrating state. An insertion cylinder 16 is integrally projected on the back surface of the substrate portion 12. Accordingly, the unit base 7 fits the insertion cylinder 16 into the crosspiece 5 and fits the ear piece 12 into the groove side portion of the support column 4, and further, as shown in the figure, the substrate portion 12 and the support column 4. By using fasteners such as bolts and nuts through the holes penetrating into the column, the column 4 can be firmly attached. The mounting structure of the unit base 7 to the support column 4 can employ any structure other than the structure shown in the figure.

(Auxiliary leg)
The auxiliary leg 8 is formed of a metal square pipe and includes a leg portion 18 extending from a bifurcated pivot portion 17, and the pivot portion 17 is connected to the upper bracket 13 of the unit base 7 via a main shaft 19. And a closed leg posture P1 (see FIG. 6 (A)), which is an upward posture along the column 4, and an open leg posture P2 (FIG. 6 (B)), which is separated from the column 4 and has a downward inclined posture. It is configured so as to be freely rotatable between (see). In the case of the illustrated embodiment, the pivot portion 17 is indirectly pivotally connected to the support column 4 via the unit table 7, but a bracket is formed on the support column 4 without using the unit table 7. In addition, it may be directly pivoted to the support column 4, in other words, it may be anything that is directly or indirectly pivoted to the support column 4.

In the case of the illustrated example, the auxiliary leg 8 is configured to be held in the closed leg posture by the holding means 20 when in the closed leg posture P1, and is formed by a pair of holding claws protruding in the vicinity of the upper end of the unit base 7. The holding means 20 is configured to hold the both side surfaces of the leg portion 18 of the auxiliary leg 8 so as to be detachable. However, the holding means 20 may be provided on the support column 4 instead of the unit base 7. Furthermore, in the case of the illustrated embodiment, as will be described later with reference to FIG. 7, the locking portion 36 of the lock arm 9 is locked to the claw portion 33 of the actuating means 31, thereby maintaining the closed leg posture P <b> 1 of the auxiliary leg 8. Since it is configured to be able to do so, the holding means 20 may not be provided.

(Lock arm)
The lock arm 9 is formed by bending a metal plate, and includes an arm portion 23 that extends from the bifurcated base portion 21 toward the distal end portion 22 by bending along both side edges of the substrate portion 9a. The base 21 is pivotally connected to the lower bracket 14 of the unit base 7 via the pivot 24, and the storage posture M <b> 1 (see FIG. 6A) is set upward along the column 4. Thus, the spring 25 is configured so as to be rotatable between a lock posture M2 (see FIG. 6B) that is an upward inclined posture, and is biased from the retracted posture M1 toward the lock posture M2. It has. In the case of the illustrated embodiment, the base 21 is indirectly connected to the support column 4 via the unit table 7. However, a bracket is formed on the support column 4 without using the unit table 7. 4 may be directly pivoted, and in short, any one that is directly or indirectly pivoted with respect to the column 4 may be used.

In the case of the illustrated embodiment, the spring 25 is constituted by a spiral spring that is externally attached to the pivot 24, with one end 25 a elastically contacting the inner surface of the lock arm 9 and the other end 25 b on the lower side of the base of the lower bracket 14. It is comprised so that it may elastically contact to the support wall 14a formed in this.

In this regard, as shown in FIG. 8A, the spring 25 is elastically deformed in a state where the lock arm 9 is in the retracted posture M1, and generates an elastic force. However, the spring 25 is changed from the retracted posture M1 to the locked posture M2. It is preferable that the resilient force is lost when the head is turned by a predetermined angle θ, so that, as will be described later, the operator holds the lock arm 9 with the fingertip from the locked posture M2 to the retracted posture M1. Operation during lifting is easy.

(Lock mechanism)
The pair of arm portions 23, 23 of the lock arm 9 is configured to be able to sandwich both side surfaces of the leg portion 18 of the auxiliary leg 8, and the lock mechanism 10 is configured to support the leg portion 18 of the auxiliary leg 8. The engaging means 27 includes a pin 26 projecting on both sides, and the engaging means 29 includes a hook 28 provided on the arm portion 23 of the lock arm 9.

In the case of the illustrated embodiment, the locked means 27 is provided with a large-diameter neck on a headed bolt inserted across the leg 18 of the auxiliary leg 8, as shown in FIG. By fastening a nut to the insertion end via a sleeve, pins 26, 26 projecting on both side surfaces of the leg portion 18 are formed by the neck portion and the sleeve, and this can be used as the locked means 27. .

The locking means 29 is constituted by a hook 28 that is notched at the outer edge of the pair of arm parts 23, 23 of the lock arm 9 (the edge on the side toward the lock posture M <b> 2).

At this time, as shown in FIG. 7, when the auxiliary leg 8 is rotated around the main shaft 19 so as to be inclined downward from the closed leg posture P <b> 1, the rotation locus Q <b> 1 of the locked means 27 that draws an arc and the pivot 24 The rotation locus Q2 of the locking means 29 that draws an arc when the lock arm 9 is rotated so as to incline upward from the retracted posture M1 around is configured to intersect each other. An open leg posture P2 of the auxiliary leg 8 and a lock posture M2 of the lock arm 9 are determined. Accordingly, in this state, as shown in FIG. 6 (B), the hook 28 of the locking means 29 holds the pin 26 of the locked means 27 so that the auxiliary leg 8 is prevented from rotating. At the same time, it is locked in the open leg posture P2.

When the lock arm 9 is rotated from the locked state toward the retracted posture M1, the hook 28 (locking means 29) is retracted from the pin 26 (locked means 27), thereby releasing the locked state. The auxiliary leg 8 is rotatable.

(Control mechanism)
The control mechanism 11 includes a pivot 17 of the auxiliary leg 8 and a tip 22 of the lock arm 9. In the case of the illustrated embodiment, a pair of U-shaped fittings fixed to the pivoting portion 17 of the auxiliary leg 8 are used to place the pivoting portion 17 on both sides and pivoted to the main shaft 19 together with the pivoting portion 17. Cam members 30 and 30 are provided, and the cam member 30 and the distal end portion 22 of the lock arm 9 are disposed so as to be in contact with each other. The operating means 31 provided on the cam member 30 and the lock arm 9 are provided. The control mechanism 11 is configured by the driven means 32 provided at the distal end portion 22 of the head.

As shown in FIG. 7, the operating means 31 is formed on the periphery of the cam member 30, and has a claw portion 33 located on the front side in the turning direction toward the open leg posture P2, and the rear side in the turning direction. The claw portion 33 is formed to have a large radius and the release portion 34 has a small radius with respect to the radius of the rotation locus centered on the main shaft 19. An arcuate portion 35 that is inclined to draw a circular arc that gradually decreases in radius toward the release portion 34 is formed.

On the other hand, the driven means 32 includes an engaging portion 36 positioned on the front side in the rotational direction directly above the hook 28 toward the lock posture M2, and a control unit 37 positioned on the rear side in the rotational direction. The locking portion 36 is formed to have a small radius and the control portion 37 is formed to have a large radius with respect to the radius of the rotation locus centering on the pivot 24, and the locking portion 36 is directed toward the control portion 37. Inclined portion 38 is formed.

When the lock arm 9 is in the retracted position M1 and the auxiliary leg 8 is in the closed leg position P1, as shown in FIG. 7, the claw portion 33 comes into contact with the locking portion 36 and the lock arm 9 is opposed to the spring 25. It is held in the retracted posture M1. The auxiliary leg 8 is held by the holding means 20 of the unit base 7 as described above.

As shown in FIG. 7, in a state where the claw portion 33 and the locking portion 36 are locked, the turning locus of the releasing portion 34 defined by the radius R1 from the center of the main shaft 19 and the radius R2 from the center of the pivot 24 The rotation trajectory of the control unit 37 defined by is configured to have an intersection T at a position where the auxiliary leg 8 is rotated a predetermined angle toward the open leg posture P2. Therefore, when the release portion 34 is rotated to the intersection T, the position of the intersection T is rotated to a standby posture P3 that is close to the open leg posture P2 of the auxiliary leg 8 as shown in FIG. It is comprised so that it may become a position.

As shown in FIG. 10A, the standby posture P3 receives the arm portion 23 by the locked means 27 (pin 26) when the lock arm 9 rotates from the retracted posture M1 toward the lock posture M2. This is the rotation position of the auxiliary leg 8 that can be stopped. In the illustrated embodiment, the auxiliary leg 8 exceeds the open leg posture P <b> 2, and shows the position where it comes into contact with the support piece 15 of the unit base 7. However, the present invention is not necessarily limited to this.

(Operation of outrigger device)
The operation of the auxiliary leg 8 and the lock arm 9 based on the lock mechanism 10 and the control mechanism 11 is shown in FIGS.

FIG. 8A shows a case in which the outrigger device is not used. By setting the lock arm 9 to the retracted posture M1 and the auxiliary leg 8 to the closed leg posture P1, the auxiliary leg 8 can be used as a support column for an aerial work device. And is held by the holding means 20 described above. In this state, the lock arm 9 accumulates the elastic force of the spring 25 and holds the retracted posture M <b> 1 in a state where the locking portion 36 is in contact with the claw portion 33.

When the outrigger device is used, as shown in FIG. 8 (B), when the operator grips the leg portion 18 of the auxiliary leg 8, the rotation is started from the closed leg posture P1 toward the open leg posture P2. Then, the auxiliary leg 8 removed from the holding means 20 of the unit base 7 rotates, and the claw portion 33 pushes the locking portion 36, thereby rotating the lock arm 9 against the spring 25.

Further, when the auxiliary leg 8 is rotated toward the open leg posture P2, as shown in FIG. 9, the claw portion 33 gets over the locking portion 36, and the contact between the claw portion 33 and the locking portion 36 is released. However, since the arc-shaped portion 35 extends along the inclined portion 38, that is, the control unit 37 interferes with the arc-shaped portion 35, the lock arm 9 does not rotate toward the lock posture M2, and the spring The standing posture is held against 25.

Therefore, as shown in FIG. 10A, when the auxiliary leg 8 is continuously rotated to the position of the standby posture P3, the release unit 34 passes over the control unit 37 and passes through the control unit 37 for the first time. It is turned toward the lock posture M2 by the elastic force of.

When the auxiliary leg 8 is rotated with momentum, the support piece 15 of the unit base 7 functions as a stopper, and the auxiliary leg 8 is prevented from rotating beyond the standby posture P3.

The lock arm 9 is rotated by receiving the elastic force of the spring 25 until the rotation angle reaches the predetermined angle θ as described above, and thereafter, the lock arm 9 is moved along the chain line in FIG. The arm 23 is stopped by being received by the locked means 27 (pin 26) so as to be in the inclined posture shown.

Therefore, while the above action is performed, the operator is required only to perform an operation and work for holding the auxiliary leg 8 and rotating from the closed leg posture P1 to the standby posture P3, and other operations and work are required. do not do.

Thereafter, as shown in FIG. 10B, if the auxiliary leg 8 is lifted slightly, the lock arm 9 follows and slightly moves, and the locking means 29 (hook 28) is moved to the locked means 27 (pin). 26), the auxiliary leg 8 is thereby locked in a non-rotatable state in the open leg position P2.

In the case of the illustrated embodiment, since the standby posture P3 and the open leg posture P2 of the auxiliary leg 8 are different from each other, as shown in FIG. 10A, a lock arm that rotates toward the lock posture M2. 9 is not immediately locked by the locked means 27, so that the lifting operation of the auxiliary leg 8 as described above is required. In order to make the lifting operation unnecessary, a standby posture is required. What is necessary is just to comprise P3 so that it may correspond with the open leg posture P2. For example, a stopper for receiving the auxiliary leg 8 at the position of the open leg posture P2 is configured by the support piece 15 of the unit base 7, and when the auxiliary leg 8 is rotated from the closed leg position P1 to the open leg position P2, the control mechanism The eleven release units 34 may be configured to get over the control unit 37.

FIG. 11 shows a method and operation when the auxiliary leg 8 is changed from the open leg position P2 to the closed leg position P1 without using the outrigger device. In the state where the auxiliary leg 8 is in the open leg position P2, first, the lock arm 9 is rotated from the lock position M2 indicated by the chain line toward the retracted position M1 as indicated by the solid line. At this time, since the lock arm 9 does not have the urging force of the spring 25 up to the position of the predetermined angle θ shown in FIG. 8A, the lock arm 9 can be easily lifted up to the position of the angle θ by the fingertip. Thereafter, in a state where the lock arm 9 is pressed and held against the spring 25 by the fingertip, the auxiliary leg 8 is rotated from the open leg posture P2 indicated by the solid line toward the closed leg posture P1 indicated by the chain line, and the unit base 7 is held. The means 20 may be held.

When the auxiliary leg 8 is rotated toward the closed leg posture P1 while the lock arm 9 is pressed and held, the claw portion 33 passes through the locking portion 36 as shown by an arrow F in FIG. Later, if the lock arm 9 is released from the pressed holding state, the lock arm 9 is retracted by the contact of the claw portion 33 and the locking portion 36 as shown in FIGS. 6 (A) and 8 (A). It is held in the state of M1.

When the actuating means 31 is rotated as shown by the arrow F in FIG. 11 and the claw 33 is allowed to escape from the driven means 32 of the lock arm 9, the arcuate portion 35 of the actuating means 31 and the inclined portion 38 of the driven means 32 are In the meantime, if a cam mechanism capable of rubbing against each other is configured, the actuating means 31 that rotates toward the arrow F resists the lock arm 9 against the spring 25 even when the lock arm 9 is not pressed and held. Thus, it can be configured to escape from the driven means 32 while rotating.

(Lock arm holding mechanism)
12 to 15 show that when the lock arm 9 is rotated from the lock posture M2 toward the retracted posture M1, and when the lock arm 9 is rotated beyond the retracted posture M1 to a position where it is set to the hold posture MK, the hold posture MK. 1 shows an embodiment of a holding mechanism 39 that holds the. Although the holding mechanism 39 is not shown in the outrigger device described above with reference to FIGS. 2 to 11, it is preferable to incorporate the holding mechanism 39 as described below.

The holding mechanism 39 includes a holding member 40 that is slidable up and down and faces the lock arm 9 in the retracted position M1, and is urged in the upward direction via a resilient means. In addition, a locking claw means 41 and a locking receiving means 42 are provided on the base plate portion 9a of the lock arm 9, respectively, and a pressing means 43 and a pressed means 44 are provided on the pivot 17 and the holding member 40 of the auxiliary leg 8, respectively. ing.

In the case of the illustrated embodiment, the holding member 40 is arranged between the divided pieces 15a, 15 formed by dividing the support piece 15 protruding from the base 12 of the unit table 7 into left and right, The holding member 40 is held so as to be slidable in the vertical direction by, for example, fitting the protruding pieces 40a on both sides of the holding member 40 into the grooves 15b of the divided piece 15a. By being interposed between the bases 12, it is elastically biased upward.

At the upper end portion of the holding member 40, the pressed member 44 is formed by a horizontal cylindrical portion, and a tongue piece 46 projects from the upper end portion toward the base 12. The locking claw means 41 is provided through an arm 47 protruding toward the substrate portion 9a of the lock arm 9. The tongue piece 46 abuts on the lower surface of a stopper 48 provided on the base 12, thereby restricting the raised position of the holding member 40 that is elastically biased upward.

As shown in FIG. 13B, the locking claw means 41 forms a downward movement guide means 49 with an inclined surface that is gradually inclined upward from the tip of the claw, and is provided on the back surface of the downward movement guide means 49. The locking portion 50 is formed by the vertical wall surface.

The latch receiving means 42 is formed by the upper edge portion of the window hole 51 formed in the substrate portion 9 a of the lock arm 9. As shown in FIG. 13B, the size of the window hole 51 is such that when the holding member 39 is at a predetermined height position and the locking claw means 41 is opposed to the window hole 51, the substrate portion of the lock arm 9. In order to allow 9a to freely rotate without interfering with the locking claw means 41, it is formed to have a vertical width W as shown.

The pressing means 43 is composed of a tongue piece located on the pivoting portion 17 of the auxiliary leg 9 and provided on the opposite side of the actuating means 31, and when the auxiliary leg 9 is in a closed leg posture P1, the pressed means 44 is pushed down, and the holding member 39 is lowered against the elastic means 45.

(State when the outrigger device is not used)
FIGS. 13A and 13B show a state when the outrigger device is not used. The lock arm 9 is in the retracted posture M1, and the auxiliary leg 8 is in the closed leg posture P1. As described above, the lock arm 9 is ejected toward the lock posture M2 by the spring 25, but since the locking portion 36 is locked to the claw portion 33, the lock arm 9 holds the retracted posture M1. . At this time, the holding member 39 is lowered against the elastic means 45 when the pressed means 44 is pressed by the pressing means 43, and the locking claw means 41 is in the lowered position L in the window hole. 51.

(State when using outrigger device)
FIG. 13 (C) shows a state when the outrigger device is used. The auxiliary leg 8 is in the open leg posture P2, and the lock arm 9 is in the lock posture M2. In this state, the pressed means 44 is released from being pressed by the pressing means 43, and the holding member 39 is raised by the resilient means 45 to a position where the tongue piece 46 comes into contact with the stopper 48, and the locking claw means 41 is made to stand by at the raising position H.

(Operation of holding mechanism)
FIG. 14 shows that when the lock arm 9 is rotated from the lock posture M2 toward the retracted posture M1 in a state where the auxiliary leg 8 is in the open leg posture P2 in order to fold the outrigger device, the retractable posture M1 is exceeded. The operation of holding the lock arm 9 in the holding posture MK by the holding mechanism 40 by rotating to the position in which the holding posture MK is set is shown.

As shown in FIG. 14A, when the lock arm 9 is rotated toward the retracted posture M1, the window hole 51 moves forward toward the locking claw means 41 of the holding member 39. When the lock arm 9 is rotated against the spring 25 toward the position exceeding the retracted posture M1, the window moves with respect to the downward guide means 50 of the locking claw means 41 positioned at the raised position H described above. The latch receiving means 42 formed by the upper edge portion of the hole 51 abuts.

Therefore, as shown in FIG. 14B, when the lock arm 9 is further rotated against the spring 25, the latch receiving means 42 of the window hole 51 moves along the downward movement guide means 50. The holding member 39 is lowered together with the downward movement guide means 50, and the locking receiving means 42 passes through the downward movement guide means 50.

As shown in FIG. 14C, when the lock arm 9 is rotated to the holding posture MK, the holding member 39 is lifted by the elastic means 45 as the latch receiving means 42 passes through the downward movement guide means 50. The locking portion 50 is locked to the outside of the locking receiving means 42 by lifting the locking claw means 41 to the locking position K. Accordingly, the lock arm 9 is held in the holding posture MK against the spring 25. In the case of the illustrated example, the locking position K of the locking claw means 41 is a position slightly lowered from the raised position H, but may be configured to coincide with the raised position H.

Such an operation is performed by the operator turning the lock arm 9 from the lock posture M2 to the holding posture MK with the fingertip, and the lock arm 9 can be held in the holding posture MK. Thereafter, by freely using both hands, the auxiliary leg 8 can be easily rotated from the open leg position P2 toward the closed leg position P1.

(Auxiliary leg closed)
FIG. 15 shows the operation when the auxiliary leg 8 is rotated from the open leg position P2 toward the closed leg position P1 with the lock arm 9 held in the holding position MK as described above. As shown in FIG. 15A, when the auxiliary leg 8 is rotated to a position in the vicinity of the closed leg posture P1, the pressing means 43 presses the pressed means 44, and the holding member 40 is lowered against the elastic means 45. Let As shown in FIG. 15 (B), when the auxiliary leg 8 is in the closed leg posture P1, the holding member 40 is further lowered to place the locking claw means 41 at the above-described lowered position L, and the locking portion 50 And the latch by the latch receiving means 42 is cancelled | released. In this state, since the lock arm 9 receives the elastic force of the spring 25, as shown by a chain line in the figure, the lock arm 9 automatically rotates from the holding posture MK toward the retracted posture M1. By engaging the stop 36 with the claw 33 of the auxiliary leg 8, the retracted posture M1 is maintained. Accordingly, since the lock arm 9 stands by in the state of holding the retracted posture M1 for using the outrigger device again, the auxiliary leg 8 is again rotated from the open leg posture P2 toward the closed leg posture P1. In some cases, automatic locking is possible by automatically turning toward the locking posture M2.

DESCRIPTION OF SYMBOLS 1 Height working apparatus 1a Stepladder 2 Leg 3 Top plate 4 Post 5 Standing bar 6 Outrigger device 7 Unit base 8 Auxiliary leg 9 Lock arm 10 Lock mechanism 11 Control mechanism 12 Substrate part 12a Ear piece 13 Upper bracket 14 Lower bracket 14a Support Wall 15 Supporting piece 15a Dividing piece 15b Groove 16 Insertion cylinder 17 Pivoting part 18 Leg part 19 Spindle 20 Holding means 21 Base part 22 End part 23 Arm part 24 Pivot 25 Spring 25a One end part 25b Other end part 26 Pin 27 Engagement Locking means 28 Hook 29 Locking means 30 Cam member 31 Actuating means 32 Driven means 33 Claw part 34 Release part 35 Arc-shaped part 36 Locking part 37 Control part 38 Inclining part 39 Holding mechanism 40 Holding member 40a Projection piece 41 Locking claw means 42 Locking receiving means 43 Pressing means 44 Pressed means 45 Repelling means 46 Tongue piece 47 Arm 48 Stopper 49 Downward movement Id means 50 locking portion 51 windows

Claims (4)

It is an outrigger device attached to the post of an aerial work device, and constitutes an auxiliary leg, a lock arm, a lock mechanism, and a control mechanism,
The auxiliary leg (8) is provided with a leg portion (18) extending from a pivot portion (17) pivotally coupled to the column via a main shaft (19), and is in a closed leg position in an upward posture held along the column ( P1) and an open leg posture (P2) that is inclined downward and away from the support,
The lock arm (9) includes an arm portion (23) extending from a base portion (21) that is pivotally connected to a support column via a pivot shaft (24) at a position below the main shaft toward a distal end portion (22). Along the retracted position (M1), which is set to the upward position along with the lock position (M2), which is set to the inclined position apart from the support column, and is configured to be rotatable from the retracted position to the locked position. It has a spring (25) biased toward it,
The locking mechanism (10) includes a locked means (27) provided on the leg portion of the auxiliary leg, and a locking means (29) provided on the arm portion of the lock arm. When the locking arm (9) is rotated toward the locking posture (M2) with respect to the auxiliary leg (8), the locking means (29) is locked to the locked means (27). Configured to lock the auxiliary leg in the open leg position,
The control mechanism (11) is constituted by a driven means (32) provided at the distal end portion (22) of the lock arm and an operating means (31) provided at the pivoting portion (17) of the auxiliary leg. When the auxiliary leg (8) is positioned in the closed leg position (P1) with respect to the lock arm (9) designated as M1), the operating arm (31) is brought into contact with the driven means (32) to Constructed to hold the retracted posture (M1) against the spring,
When the auxiliary leg (8) is rotated toward the open leg position (P2), the locking means is pushed against the spring while the operating means (31) is in contact with the driven means (32), When the auxiliary leg (8) is further rotated and positioned in the vicinity of the open leg position (P2), the operating means (31) gets over the driven means (32), so that the lock arm (9) is moved by the spring. An outrigger device in an aerial work device, characterized in that the device is configured to rotate toward a locked posture (M2). The actuating means (31) is provided with a claw portion (33) on the front side in the rotation direction toward the open leg posture (P2) with respect to the radius of the rotation locus centered on the main axis, and on the rear side in the rotation direction. A release portion (34) having a rotation locus with a smaller radius (R2) than the claw portion,
The driven means (32) is provided with a locking portion (36) on the front side in the rotation direction toward the lock posture (M2) with respect to the radius of the rotation locus centering on the pivot, and on the rear side in the rotation direction. A control unit (37) having a rotation locus with a larger radius (R2) than the locking unit;
When the auxiliary leg (8) is rotated toward the closed leg position (P2) with respect to the lock arm (9) in the retracted position (M1), the pawl of the actuating means is engaged with the locking portion (36) of the driven means. When the part (33) abuts, the lock arm (9) is held in the retracted posture (M1) against the spring,
When the auxiliary leg (8) is rotated toward the open leg position (P2), the lock arm is spring-springed with the claw portion (33) of the actuating means in contact with the locking portion (36) of the driven means. When the claw portion (33) of the actuating means gets over the locking portion (36) of the driven means by the rotation, the release portion (34) of the actuating means is moved by the driven means. By contacting the control part (37), the lock arm (9) is prevented from rotating toward the lock posture (M2) by the spring,
Further, when the auxiliary leg (8) is rotated and positioned in the vicinity of the open leg posture (P2), the release part (34) of the actuating means gets over the control part (37) of the driven means, The outrigger device in an aerial work device according to claim 1, wherein the lock arm (9) is configured to be rotated toward a locked posture (M2) by a spring. The spring (25) of the lock arm (9) generates a resilient force when the lock arm is in the retracted position (M1), but a predetermined angle θ from the retracted position (M1) to the locked position (M2). The outrigger device in an aerial work device according to claim 1, wherein the outrigger device is configured so as to lose its elastic force when it is rotated only. The lock arm (9) is rotated from the lock posture (M2) toward the retracted posture (M1) and is held in the holding posture when the lock arm (9) is rotated to a position where the lock posture (MK) is exceeded. A holding mechanism (39) is provided,
The holding mechanism (39) is provided so as to be slidable up and down facing the lock arm (9) in the retracted posture (M1) and is urged in the upward direction via the resilient means (45) ( 40), the holding member (40) and the lock arm (9) are provided with a locking claw means (41) and a locking receiving means (42), respectively, and the pivot part (17) of the auxiliary leg (8). ) And holding member (40) are provided with pressing means (43) and pressed means (44), respectively.
When the auxiliary leg (8) is in the closed leg position P1), the pressing member (43) presses the pressed member (44) to hold the holding member (40) against the impacting means (45) to a predetermined lowered position. (L) and when the auxiliary leg (8) is in the open leg position (P2), the holding member (40) is ejected by releasing the pressing means (43) from the pressed means (44). 45) is configured to rise to a predetermined ascending position (U),
The locking claw means (41) and the locking receiving means (42) are configured to hold the lock arm (9) from the retracted position (M1) while holding the auxiliary leg (8) in the open leg position (P2) ( MK) is provided with a downward movement guide means (49) that comes into contact with each other and lowers the holding member (39) from the raised position (U) when rotating toward the MK) and holds the lock arm (9) in a holding posture ( The locking claw means (41) is locked to the locking receiving means (42) by releasing the contact and raising the holding member (40) to the locking position (K) when rotating to MK). Composed of
The pressing means (43) and the pressed means (44) are held when the auxiliary leg (8) is rotated to the closed leg position (P1) with the lock arm (9) holding the holding position (MK). The locking claw means (41) and the locking receiving means (42) are unlocked by lowering the member (40) to the lowered position (L), and the lock arm (9) is held by the spring (25). 4. The outrigger device in an aerial work device according to claim 1, wherein the outrigger device is configured to rotate from a posture (MK) toward a retracted posture (M1).

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