JP2017203269A - Outrigger device of high lift work device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outrigger device used with a high lift work device.SOLUTION: An outrigger device comprises an auxiliary leg attached on a support post of a high lift work device, and is rotatable between a closed leg posture (P1) that brings the auxiliary leg to a posture facing upward along the support post, and an open leg posture (P2) that brings the auxiliary leg to a downwardly inclined posture by reversing from the closed leg posture. With regard to a posture lock device (13) that locks at least the auxiliary leg in the open leg posture (P2), engaged means (11) and engaging means (12) are formed by an open leg lock tooth (17) provided on a fixing arm (15) that rotates integrally with the auxiliary leg, and an open leg lock claw (21) provided on a lock arm (19) pivotally connected swingably to the support post. A spring (22) is provided for rotating and energizing the lock arm (19) in a direction to engage the open leg lock claw (21) with the open leg lock tooth (17).SELECTED DRAWING: Figure 7

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, providing a link mechanism for opening and closing the auxiliary legs increases the total weight of the aerial work equipment, not only resulting in high costs due to the large number of parts and the complicated structure. It is inconvenient to carry.

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.

When the posture lock device is configured to require a complicated operation from the worker in order to increase the reliability of the lock, not only the worker does not like the operation but also the imperfect operation causes the imperfect lock. There is a risk of state.

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 problem, and is an outrigger device configured by auxiliary legs attached to the support column of the aerial work apparatus, and the auxiliary leg is connected to the support column. A closed leg posture including a support leg extending from a pivot part pivoted through a main shaft, the leg being an upward posture along the support column, and an open leg posture being inverted from the closed leg posture to be a downward inclined posture. The posture locking device is configured by providing a locking means on the auxiliary leg and a locking means on the support column. A fixed arm extending from the pivot portion so as to rotate integrally with the support leg; and an open leg lock tooth provided on the fixed arm, and the open leg lock tooth when the support leg is in the open leg position. Protrude toward the inside of the column The locking means includes a lock arm that is pivotally connected to a support column via a swing shaft so as to face the fixed arm, and an open leg lock claw provided on the lock arm. The leg locking claw is configured to be detachably engaged with the leg locking teeth when the leg is in the open leg posture, and the locking means moves the lock arm from the inside to the outside of the column. A spring for biasing in the turning direction is provided, and the open leg lock teeth are configured to engage the open leg lock pawls in opposition to the rotary direction of the lock arm.

In a preferred embodiment of the present invention, the lock arm relates to an arc (M2) defined by a radius (R2) from the center of the swing axis, and the leg lock is configured to swing along the arc (M2). A claw is provided, and the fixed arm is defined by a radius (r2) from the center of the main shaft, and with respect to the arc (m2) that intersects the arc (M2), when the support leg is in the open leg position (P2), The leg locking teeth are provided facing the portion where the arc (M2) and the arc (m2) of the fixed arm intersect, and when the supporting leg is in the open posture, the leg locking claw is used as the leg locking tooth. It is configured to lock.

At this time, the open leg lock teeth provided on the fixed arm have a plurality of teeth arranged in the extending direction of the fixed arm so that the open leg angle with respect to the support column of the support leg in the open leg posture is selectable. The plurality of teeth are positioned on the inner side or the outer side of the standard tooth located on the locus and the locus (M2) with respect to the oscillation locus (M2) of the open leg lock claw around the oscillation axis. Preferably, at least one selection tooth is provided.

In an embodiment of the present invention, the lock arm includes two first arcs (M1) defined by two first radii (R1) and second radii (R2) that are different in distance from the center of the swing shaft. For the second arc (M2), a closed leg lock claw is provided so as to swing along the first arc (M1), and the open leg lock claw is provided so as to swing along the second arc (M2). The fixed arm is defined by two first radii (r1) and second radii (r2) that are different in distance from the center of the main axis, and two first arcs (M1) and (M2) intersecting the arcs (M1) and (M2), respectively. With regard to m1) and the second arc (m2), when the support leg is in the closed leg posture, the closed leg locking teeth are placed facing the part where the first arc (M1) of the lock arm and the first arc (m1) of the fixed arm intersect. When the support leg is in the open leg position, the leg of the lock arm faces the part where the second arc (M2) of the lock arm and the second arc (m2) of the fixed arm intersect. When the support leg is in the closed position, the closed leg lock claw is locked to the closed leg lock tooth, and when the support leg is in the open leg position, the open leg lock claw is set to the open leg lock tooth. It is comprised so that it may latch on.

In the embodiment of the present invention, instead of or in addition to the configuration with the closed leg lock claw and the closed leg lock tooth, a locking hole penetrating the support column and a substrate portion pivotably connected to the auxiliary leg are provided. The locking protrusion constitutes a closed leg locking device that detachably locks the locking protrusion to the locking hole when the auxiliary leg is in a closed leg posture, and the locking protrusion enters the locking hole. And a guide portion having an inclined surface folded back from the tip of the protrusion, and a locking end of the tip of the guide, and the substrate portion rotates the locking end by a spring. It is urged in the rotational direction (R1) that is the forward direction of the moving direction, and the operation part of the operation arm extended from the substrate part is projected from the window hole formed in the auxiliary leg, The board is configured to be rotatable in the reverse direction (R2) against the spring, and the auxiliary leg is In the closed leg posture superimposed on the column, the locking edge of the locking hole presses the guide portion to rotate the substrate portion and the locking projection against the spring in the reverse direction (R2). When the locking projection is inserted into the locking hole and the guide part gets over the locking edge, the locking end is engaged by rotating the substrate part and the locking protrusion back in the rotation direction (R1) with a spring. The locking projection is locked to a position displaced from the stop edge, and the locking projection is locked to the locking hole so as not to escape.

According to the present invention, in an outrigger device in an aerial work device, a posture locking device for locking an auxiliary leg as a closed leg posture and an open leg posture has a simple structure with a small number of parts, and can be locked and unlocked. The operation is easy, and there is an effect that a locked state with high reliability can be obtained.

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 the state which closed the auxiliary leg regarding 1 embodiment of the outrigger apparatus which concerns on this invention. It is a perspective view which shows the fixed arm which comprises the support leg which comprises an auxiliary leg, and the attitude | position locking device in an exploded state. It is a perspective view which shows the support leg of the state which attached the fixed arm, and the support | pillar of an aerial work apparatus. It is a perspective view which shows the structural member of the lock arm which comprises an attitude | position locking device in a disassembled state. It is a perspective view which shows the lock arm of the state which assembled the structural member, and the support | pillar of an aerial work apparatus. Fig. 7 shows the mutual relationship between the closed leg lock claw and the open leg lock claw of the lock arm and the closed leg lock tooth and the open leg lock tooth of the fixed arm, (A) is a front view showing the action in the closed leg posture, and (B) It is a front view which shows the effect | action at the time of an open leg posture. The action of the posture lock device in a state where the auxiliary leg is in the closed leg posture is shown, (A) is a front view showing the whole, and (B) is an enlarged front view showing only the posture lock device. It is a front view which shows the method for making it an open leg posture by unlocking a posture lock device from the state which made an auxiliary leg a closed leg posture. The action of the posture lock apparatus in the state which made the auxiliary leg an open leg position is shown, (A) is a front view showing the whole, and (B) is an enlarged front view showing only the posture lock apparatus. The positional relationship between the open leg lock teeth and the open leg lock claws composed of a plurality of teeth is shown, (A) is an explanatory diagram showing the positional relationship between the standard teeth and the selected teeth, and (B) is for selecting the leg angle. It is explanatory drawing which shows an effect | action. It is a perspective view which shows one example of the closed leg locking device comprised in order to lock the auxiliary leg made into the closed leg posture, and shows the state just before the external fitting which made the auxiliary leg face the support | pillar. It is a perspective view which shows the state which locked the auxiliary leg with respect to the support | pillar regarding the effect | action of a closed leg lock apparatus. It is a perspective view which shows the state which made the auxiliary leg unlocked separated from the support | pillar regarding the effect | action of a closed leg lock apparatus. When providing a pair of left and right auxiliary legs for the left and right support posts of an aerial work device, it is a side view for explaining an embodiment in which the closed leg locking device for the left and right auxiliary legs is constituted by a common part. The preferred embodiment regarding the operation arm of a closed leg locking device is shown, (A) is a side view showing the composition of an operation arm, (B) is the side view showing the 1st attachment form of the operation arm to a substrate part, (C). These are side views which show the 2nd attachment form of the operation arm with respect to a board | substrate part.

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 a state in which the outrigger devices 6 and 6 are provided on the pair of support columns 4 and 4 in one leg 2, respectively. However, the present invention is not limited to this. 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. It can be installed. Furthermore, it does not ask | require whether the support | pillar 4 is an expansion-contraction leg or a non-expansion leg.

The outrigger device 6 includes an auxiliary leg 7 attached to the support column 4 of the aerial work device 1, and the auxiliary leg 7 is connected to the support column 4 via a main shaft 8. The support leg 10 extends from the closed leg position P1 in which the support leg 10 is set in an upward position along the column 4 and the open leg position P2 that is inverted from the closed leg position and is set in a downward inclined position. The posture locking device 13 is configured by providing the latched means 11 on the auxiliary leg 7 and the latching means 12 on the support column 4.

As shown in FIGS. 1 to 4, the support leg 10 is formed into a groove shape having a bottom wall 7a and both side walls 7b and 7b by bending a metal plate, and thereby, when a closed leg posture P1 is obtained, It is preferable to cover the support column 4 from the outside in an externally fitted state. In the case of the illustrated example, the pivot portions 9 and 9 are formed by providing pivot holes in the brackets 7c and 7c of the side walls 7b and 7b extending beyond the bottom wall 7a, and the both side walls 7b and 7b are It is formed so as to gradually become narrower toward the tip, that is, to gradually reduce the groove, and is reinforced by folding the edges of both side walls 7b, 7b outward and providing reinforcing ribs 7d.

As shown in FIGS. 3 and 4, the locked means 11 constituting the posture locking device 13 is a fixing bracket made of a high-strength metal plate that is attached and fixed to a place including the brackets 7 c and 7 c of the support leg 10. 14. The fixture 14 includes a mounting portion 14a that is overlapped with the bottom wall 7a at a location facing between the brackets 7c and 7c of the support leg 10 and is fixed by a fixing tool such as a rivet, and the bracket 7c from both ends of the mounting portion 14a. Fixed arms 15 and 15 including reinforcing portions 14b and 14b overlapped on the outer surface of 7c are extended.

In the case of the illustrated embodiment, the laminated body of the bracket 7c and the reinforcing portion 14b that are overlapped is pivotally supported by penetrating the main shaft 8 in a state of being attached to both side surfaces of the support column 4, and the pivotal body is supported by the laminated body. Although the connection part 9 is comprised, you may comprise the pivot part 9 by either one of the bracket 7c and the reinforcement part 14b. At this time, as shown in FIG. 4, when the support column 4 is constituted by a groove-type member, the main shaft 8 is preferably inserted into the collar 8a in the groove. In the case of the illustrated embodiment, the pivoting portion 9 is directly pivoted to the support column 4, but a separate metal fitting is provided on the support column 4 so that the pivoting portion 9 is indirectly pivoted. You may do it.

Therefore, the fixed arm 15 is located at an extension portion extending from the pivot portion 9 so as to rotate integrally with the support leg 10, and protrudes toward the inner side of the column 4 when the support leg 10 is in the closed leg posture P <b> 1. The leg locking teeth 16 are provided, and the leg locking teeth 17 that protrude toward the inside of the support column 4 are provided when the support leg 10 is in the open leg posture P2.

As shown in FIGS. 5 and 6, the locking means 12 constituting the posture lock device 13 is a lock arm in a downward posture that is pivotally connected to the inner side of a support column 4 made of a groove-type member via a swing shaft 18. 19, and a closed leg locking claw 20 and an open leg locking claw 21 are provided at the lower end of the lock arm 19, and the lower end of the lock arm 19 is rotated in the direction from the inside to the outside of the column 4. An urging spring 22 is provided.

In the case of the illustrated embodiment, a bearing member 23 having a U-shaped cross section is secured to the groove bottom of the column 4 via a fastener such as a bolt, and the swing shaft 18 is passed through the bearing portion 23 and the tail end portion of the lock arm 19. The lock arm 19 is indirectly connected to the support column 4, but the rocking shaft 18 is passed through both side walls of the support column 4, thereby eliminating the need for the bearing member 23 and the lock arm 19 being connected to the support column 4. You may comprise so that it may link directly to.

The lock arm 19 is formed of a high-strength metal plate, and the side walls 19b and 19b bent from both side edges of the flat plate portion 19a are overlapped on both side surfaces of the bearing portion 22, and penetrate the swing shaft 18. The tabs 19a and 19c are projected on both sides of the lower end of the flat plate portion 19a, and a tongue piece 19d protruding downward from between the ear pieces 19c and 19c is provided. The operation unit 24 is configured by 19d.

In the illustrated example, the ear-shaped pieces 19c and 19c are fixed by a fixing tool such as a rivet in a state where the reinforcing plate 25 is overlapped, and the stacked reinforcing plate 25 and the lower edges of the ear-shaped pieces 19c and 19c are used. The closed leg lock claw 20 is formed, and the open leg lock claw 21 is formed by an upper edge.

The spring 22 is constituted by a spiral spring that is externally attached to the swing shaft 18 inside the bearing member 23, and urges the lower end portion of the lock arm 19 in a direction to rotate toward the groove bottom of the support column 4. , The reinforcing plate 25 superimposed on the ear-shaped pieces 19c, 19c is brought into contact with the side edge of the support column 4 in a pressed state.

Closed leg locking claw 20 and open leg locking claw 21 provided on the lock arm 19 constituting the locking means 12 of the posture locking device 13, and provided on the fixed arm 15 of the auxiliary leg 7 constituting the locked means 11. The closed leg lock teeth 16 and the open leg lock teeth 17 are configured to have a relationship as shown in FIG.

As shown in FIG. 7A, the lock arm 19 is defined by two first radii R1 and second radii R2 (R1> R2 in the illustrated case) that are different in distance from the center of the swing shaft 18. With respect to the two first arcs M1 and the second arc M2 (in the illustrated case, M1> M2), the closed leg locking claw 20 is provided so as to swing along the first arc M1, and the swing along the second arc M2. The leg locking claw 21 is provided so as to move.

On the other hand, the fixed arm 15 is defined by two first radii r1 and second radii r2 (r1 <r2 in the case of illustration) that are different in distance from the center of the main shaft 8, and are respectively in the arcs M1 and M2. With respect to two intersecting first arc m1 and second arc m2 (in the case, m1 <m2), the first arc M1 of the lock arm 19 and the first of the fixed arm 15 when the support leg 10 is in the closed leg posture P1. Closed leg locking teeth 16 are provided facing the part where the arc m1 intersects, and when the support leg 10 is in the open leg position P2, it faces the part where the second arc M2 of the lock arm 19 and the second arc m2 of the fixed arm 19 intersect. The leg locking teeth 17 are provided.

As a result, when the support leg 10 is in the closed leg posture P1, the closed leg posture P1 is held by the closed leg lock pawl 20 being engaged with the closed leg lock teeth 16 as shown in FIG. Further, when the support leg 10 is set to the open leg posture P2 so as to open with respect to the support column 4 at a predetermined angle θ, the open leg lock pawl 21 is engaged with the open leg lock teeth 17 as shown in FIG. By doing so, the open leg posture P2 is maintained.

FIG. 8 shows a state where the closed leg posture P <b> 1 is set in order to retract the auxiliary leg 7 without using the outrigger device 6. The auxiliary leg 7 is directed upward along the support column 4 from the main shaft 8, and the support column 4 is fitted into the support column 4 from outside to be stored compactly. In this state, the fixed arm 15 constituting the locked means 11 of the posture lock device 13 is almost entirely overlapped with the side surface of the support column 4 except that only the closed leg lock teeth 17 protrude to the inside of the support column 4 and is unnecessary. No protuberances are formed. In this state, the lock arm 19 constituting the locking means 12 locks the closed leg lock claw 20 in mesh with the closed leg lock teeth 16, and the closed leg lock claw 20 is indicated by an arrow F by the urging force of the spring 22. Are in pressure contact with each other in the meshing direction. Therefore, even if the auxiliary leg 7 receives an external force in the direction of opening when carrying the aerial work device 1, the locked state by the posture lock device 13 is not likely to be unlocked.

In this state, when the auxiliary leg 7 is opened to use the outrigger device 6 at the time of working at a high place, as shown in FIG. If it is swung against 22, the closed leg locking claw 20 is separated from the closed leg locking teeth 16 and unlocks the posture locking device 13. Accordingly, the auxiliary leg 7 can be rotated in the direction of the opening leg as shown in the figure.

FIG. 10 shows a state in which the auxiliary leg 7 is in the open leg position P2, and the auxiliary leg 7 is inverted from the closed leg position P1 to be in a downward inclined position and opened at a predetermined angle θ with respect to the support column 4. The state is maintained, and the tip of the support leg 10 is supported or brought close to the ground or floor G to function as an intended outrigger.

In this state, the lock arm 19 constituting the locking means 12 locks the open leg lock claw 21 in mesh with the open leg lock teeth 17, and the urging force of the spring 22 moves the open leg lock claw 21 to the arrow F. As shown in FIG. Accordingly, even when the auxiliary leg 7 of the outrigger device 6 receives an external force in the direction of widening the predetermined angle θ, that is, in the closed leg direction indicated by the arrow NG shown in the drawing, the fixed arm that tries to rotate due to this. 15, the leg locking claw 21 of the lock arm 19 biased in the direction of arrow F by the spring 22 with respect to the rotation direction of the leg locking tooth 17 in FIG. Will not be unlocked.

The outrigger device 6 is configured to be able to select the leg opening angle θ of the support leg 10 in the leg-opening posture P2 by the posture lock device 13, and thereby, for example, the ground or the floor G is not flat. Even in the case of a state or the like, the distal end portion of the support leg 10 can be suitably grounded.

In order to enable this, as shown in FIG. 12, the open leg lock teeth 17 are provided with a plurality of teeth arranged in the extending direction of the fixed arm 15. The plurality of teeth are positioned on the locus with respect to the second arc M2 of the lock arm 19 defined by the second radius R2 centered on the oscillation shaft 18, that is, the oscillation locus of the leg locking claw 21. And a standard tooth 17a, and at least one selected tooth located inside or outside the second radius R2 from the locus. In the case of the illustrated embodiment, the first selection tooth 17b located inside the second radius R2 is provided on the distal end side of the fixed arm 15 with the standard tooth 17a interposed therebetween, and the outer side of the second radius R2 is provided on the opposite side. The 2nd selection tooth | gear 17c located in is provided.

When the spread leg lock claw 21 is engaged with the standard tooth 17a, the lock arm 19 is indicated by a radius R2 connecting the center of the swing shaft 18 and the spread leg lock claw 21, as shown in FIG. The fixed arm 15 holds the posture Y1 indicated by the radius r2 connecting the center of the main shaft 8 and the standard tooth 17a, so that the support leg 10 has an opening angle with respect to the support column 4 by a predetermined angle θ. It is locked in the state.

In this state, when the support leg 10 is locked in a state where the leg opening angle is made smaller than the predetermined angle θ, the fixed arm 15 is changed from the posture Y1 to the posture Y2 shown in the figure as shown in FIG. At the same time, if the lock arm 19 is changed from the posture X1 to the posture X2 shown in the figure, the leg opening claw 21 is locked to the second selection tooth 17c, and thereby, the leg opening posture P2 that maintains a small leg opening angle. Thus, the support leg 10 can be locked.

Although not shown in the drawings, when the support leg 10 is locked in a state where the opening leg angle is larger than the predetermined angle θ, the locking arm 19 and the fixed arm 15 can be opened by changing the posture in the opposite direction. The leg lock claw 21 engages with the first selection teeth 17b, and thus the support leg 10 can be locked in the open leg posture P2 that maintains a large leg angle.

Such a posture change for changing the open leg angle θ and a posture change for changing the supporting leg 10 from the open leg posture P2 to the closed leg posture P1 can be easily and easily performed. In other words, the unlocked state can be obtained simply and simply by placing the operator's fingertip on the operation portion 24 and swinging the lock arm 19 against the spring 22, and after changing the posture, the operation portion 24 is released from the fingertip. Then, the locked state is automatically obtained when the lock arm 19 is rotated by the spring 22.

Of course, the present invention is not limited to the illustrated embodiment. For example, in the above-described embodiment, the lock arm 19 is arranged in a downward posture from the swing shaft 18. The arrangement of the closed leg lock claw 20 and the open leg lock claw 21 of the lock arm 19 and the closed leg lock teeth 16 and the open leg lock teeth 17 of the fixed arm 15 is configured as shown in the figure. 8, the lock arm 19 may be arranged in an upward posture. Even in this case, the closed leg lock claw 20 and the open leg lock claw 21, the closed leg lock teeth 16 and the open leg lock teeth 17 may be used. If the arrangement relationship is changed, it is possible to provide the posture locking device 13 having the same functions and operations as described above.

(Closed leg lock device)
12 to 15 show an example of the closed leg lock device 26 configured to lock the auxiliary leg 7 in the closed leg posture P1 without rattling. As described above, the auxiliary leg 7 is locked by the locking of the closed leg lock teeth 16 and the closed leg lock claw 20 of the attitude lock device 13 in the closed leg position P1, but instead of this configuration or this In addition to such a configuration, a closed leg lock device 26 can be provided.

As shown in FIG. 12, the closed leg lock device 26 includes a locking hole 27 penetrating the support column 4 and a locking projection 28 provided on the support leg 10 constituting the auxiliary leg 7. When the closed leg posture P <b> 1 is obtained by externally fitting to the support column 4, the locking projection 28 is configured to be locked in and out of the locking hole 27.

The locking projection 28 is provided on a base plate 30 pivotally supported via a pivot 29 such as a bolt fixed to the bottom wall 7 a of the auxiliary leg 7, and enters the locking hole 27. A freely projecting portion 28a, a guide portion 28b having an inclined surface by being folded back from the tip end of the projection portion 28a, and a locking end portion 28c formed at the tip end of the guide portion 28b are provided. .

The substrate portion 30 is urged by a spring 31 in a rotation direction R1 with the locking end portion 28c facing forward in the rotation direction, and the operation of the distal end of the operation arm 32 extending from the substrate portion 30 is operated. The portion 32 a is projected from a window hole 33 formed in the side wall 7 b of the auxiliary leg 7. In addition, the window hole 33 is formed in a size that can secure a moving stroke of the operation arm 32 that moves with the rotation of the substrate portion 30.

Therefore, the substrate portion 30 urged in the rotation direction R1 is held in a state where the operation arm 32 is in contact with the side edge of the window hole 33. In this state, the locking projection 28 is supported by the support column 4. The guide portion 28 b is configured to face the locking edge 27 a of the locking hole 27.

Therefore, when the auxiliary leg 7 is externally fitted to the column 7 to bring the closed leg posture P1 shown in FIG. 13 from the state where the auxiliary leg 7 faces the column 4 as shown in FIG. It is pushed into the locking hole 27. When the locking projection 28 enters the locking hole 27, the guide portion 28b is pressed by the locking edge 27a, and the substrate portion 30 is rotated in the reverse rotation direction R2 against the spring 31. Is inserted into the locking hole 27. When the guide portion 28b gets over the locking edge 27a by the insertion, the base plate portion 30 is rotated back in the rotation direction R1 by the spring 31, and the locking end portion 28c of the locking projection 28 is engaged as shown in FIG. It moves so that it may deviate from the stop edge 27a, and thereby the locking projection 28 is locked so that it cannot escape from the locking hole 27. In this way, when locking the closed leg lock device 26, it is only necessary to rotate the auxiliary leg 7 to the position where it overlaps the column 4 with the main shaft 8 as a fulcrum, and automatic locking by one touch is possible. In addition, since the auxiliary leg 7 can be locked and held so as not to rattle in the closed leg posture P1, no noise is generated during transportation of the aerial work device 1 or the like.

In order to unlock the closed leg lock device 26 when the auxiliary leg 7 is moved away from the support column 4 to be in the open leg posture P2, as shown in FIG. 14, the operation portion 32a of the operation arm 32 protruding from the window hole 33 is provided. When the substrate portion 30 is rotated in the reverse rotation direction R2 against the spring 31 by hooking the operator's fingertip on the locking end 28c, the locking end portion 28c is positioned inside the locking hole 27, and the locking projection 28 is Since it is possible to escape from the locking hole 27, the auxiliary leg 7 may be pulled away from the support column 4 in this state. As described above, when unlocking the closed leg lock device 26, the leg is turned by placing a finger on the operation portion 32a of the operation arm 32, and in this state, the auxiliary leg 7 is held by the other finger and is brought into the open leg posture. What is necessary is just to rotate it.

FIG. 15 shows a preferred embodiment relating to the components for constituting the closed leg lock device 26, which is advantageous when the outrigger devices 6 and 6 are provided on the left and right columns 4, 4 respectively as shown in FIG. Is shown. Although not shown in the drawings, the left and right support columns 4 and 4 are provided with the locking holes 27.

Since the auxiliary leg 7 can be used in common with the left and right outrigger devices 6, 6, an attachment hole 34 for fixing the pivot 29 is provided at the left and right center position of the bottom wall 7 a, and both sides of the attachment hole 34 are provided. A left window hole 33L and a right window hole 33R are provided on the side walls 7b, 7b located at the same position. As shown in the figure, the window hole is preferably formed by a notch-shaped opening extending from the side wall 7b to the bottom wall 7a so that the operator's finger can be easily put on the operation part 3a of the operation arm 32. .

The board portion 30 and the operation arm 32 are constituted by two parts formed of separate metal plates, and the left assembly 28L and the right assembly 28R can be provided by attaching both parts. It is configured.

As shown in the figure, the substrate portion 30 is provided with the locking projection 28 via an extension portion 30b extending from the attachment substrate 30a, and is rotatable with respect to the attachment hole 34 by the pivot 29 described above. And is urged by the spring 31 in the rotation direction R1. The spring 31 is composed of a spiral spring, and has one end locked in the stop hole 35 of the auxiliary leg 7 and the other end locked near the locking projection 28. Accordingly, with respect to the left and right outrigger devices 6, 6, the board portion 30 provided with the locking protrusions 28 in the left assembly 28 </ b> L attached to the left auxiliary leg 7 and the right assembly 28 </ b> R attached to the right auxiliary leg 7. The pivot 29 and the spring 31 are attached in the same form, and both are biased in the rotation direction R1 which is the clockwise direction shown in the figure.

The board 30 mounting board 30a is provided with left mounting holes 30c, 30c on the lower side and right mounting holes 30d, 30d on the upper side. By selecting each, the operating arm 32 is used for the left side. Or, it is configured to be mounted for the right side.

The operation arm 32 includes an arm portion 32b including the operation portion 32a, and an attachment portion 32c extending from the arm portion 32b so as to be displaced in the vertical direction. Although not shown, the attachment portion 32c is provided. Are provided with holes to be attached to the attachment holes 30c and 30d by a fixing tool such as a rivet.

Therefore, by fixing the attachment portion 32c of the operation arm 32 to the left attachment holes 30c, 30c with a fixing tool such as a rivet on the base plate portion 30 constituting the left assembly 28L, the arm portion 32b is positioned on the upper side, The operating portion 32a is inserted through the left window hole 33L.

Further, the mounting portion 32c of the operation arm 32 is fixed to the right mounting holes 30d and 30d with a fixing tool such as a rivet on the base plate portion 30 constituting the right assembly 28R, so that the arm portion 32b is lowered. The operation part 32a is inserted through the right window hole 33R.

As a result, the positions of the operation portions 32a and 32a of the operation arm 32 inserted through the window holes 34L and 34R are aligned with each other between the left assembly 28L and the right assembly 28R as illustrated. In the case of the illustrated example, all are located on a horizontal line passing through the pivot 29.

Therefore, as described above, the left outrigger device 6 can be constituted by the auxiliary leg 7 provided with the left assembly 38L, and the right outrigger device 6 can be constituted by the auxiliary leg 7 provided with the right assembly 38R. At this time, the respective operation portions 32a and 32a are provided on the same side surface of the auxiliary legs 7 and 7 in the left and right outrigger devices 6 and 6, that is, the side accessed by the operator for operation (indicated by an arrow AC in FIG. 1). Because it is facing, it is easy to operate.

The left and right assemblies 28L, 28R are composed of the same parts, and the left mounting hole 30c and the right mounting hole 30d are selected and attached with the operation arm 32 facing away from the substrate portion 30. Since assembly is possible, it contributes to low-cost production by sharing parts.

At this time, as shown in the figure, the reverse direction R2 of the operation arm 32 at the time of unlocking is downward in the left assembly 28L and upward in the right assembly 28R, so that the vertical direction is set on the side walls 7b and 7b of the auxiliary leg 7. It is possible to correspond to the left and right assemblies 28L and 28R only by forming the left and right window holes 33L and 33R extended in the reverse direction. Therefore, the auxiliary leg 7 assembled with the left assembly 28L is allowed to play the right window hole 33R, and the auxiliary leg 7 assembled with the right assembly 28R is allowed to play the left window hole 33L, so that Outrigger devices 6, 6 can be provided.

(Operation arm configuration and mounting form)
In the preferred embodiment, when the operation arm 32 constituting the opening / closing lock device 26 is attached to the substrate portion 30, as shown in FIG. 16B and the first attachment form shown in FIG. The second mounting form is selectable.

That is, the operation arm 32 is configured such that the arm portion 32b and the attachment portion 32c are alternately changed by selecting an attachment form. Therefore, when the mounting portion 32c described above is attached to the substrate portion 30 and the arm portion 32b is mounted so as to be inserted through the window hole 33, the first mounting form M1 shown in FIG. Separately, by reversing the operation arm 32, the arm portion 32b in the case of the first attachment form M1 is attached to the substrate part 30 as the attachment part (32c), and in the case of the first attachment form M1. A case where the attachment portion 32c is made to be an arm portion (32b) and is inserted through the window hole can be a second attachment form M2 shown in FIG. 16 (C).

For this reason, as shown in FIG. 16A, the operation arm 32 has one attachment hole 36 attached to one of the left attachment hole 30c or the right attachment hole 30d of the substrate portion 30 described above. On the other hand, the first attachment hole 36a and the second attachment hole 36b are provided in a point-symmetric position with respect to the center, and the first operation portion 32a1 is formed at a predetermined distance L1 from the first attachment hole 36a. A second operation portion 32a2 is formed at a position of a predetermined distance L2 from the second attachment hole 36b, and is configured such that L1 <L2. In the case of the illustrated embodiment, a mark 37 made of a hole or the like is provided in the vicinity of the second attachment hole 36b, and the operation arm 32 is attached to the first mounting form M1 when mounted on the substrate unit 30. And the second mounting form M2 can be visually confirmed.

Therefore, as shown in FIG. 16B, when the first mounting form M1 is achieved by attaching the first attachment hole 36a to the substrate part 30, the distance from the pivot 29 to the first operation part 32a1 is L + L1. On the other hand, as shown in FIG. 16C, when the second attachment form M2 is achieved by attaching the second attachment hole 36b to the base plate part 30, the first operation part is started from the pivot 29. The distance to 32a1 is L + L2, and it is possible to make the distance different.

Therefore, by configuring in this way, the outrigger device 6 is made large or small, and the width dimension of the auxiliary leg 7 is different. As a result, the distance from the mounting hole 34 of the pivot 29 to the window hole 33 is different. Even in this case, there is an advantage that it is possible to easily cope with the problem by simply changing the mounting form of the operation arm 32.

DESCRIPTION OF SYMBOLS 1 Altitude work apparatus 1a Stepladder 2 Leg 3 Top plate 4 Post 5 Foot cross 6 Outrigger apparatus 7 Auxiliary leg 7a Bottom wall 7b Side wall 7c Bracket 7d Reinforcement rib 8 Main shaft 8a Collar 9 Pivoting part 10 Supporting leg 11 Locking means 12 Locking means 13 Posture locking device 14 Fixing bracket 14a Mounting portion 14b Reinforcing portion 15 Fixed arm 16 Closed leg lock tooth 17 Open leg lock tooth 17a Standard tooth 17b First selection tooth 17c Second selection tooth 18 Oscillating shaft 19 Lock arm 19a Flat plate Part 19b Side wall 19c Ear piece 19d Tongue piece 20 Closed leg lock claw 21 Open leg lock claw 22 Spring 23 Bearing member 24 Operation part 25 Reinforcement plate 26 Closed leg lock device 27 Locking hole 27a Locking edge 28 Locking protrusion 28a Projecting part 28b Guide portion 28c Locking end portion 28L Left assembly 28R Right assembly 29 Pivot 30 Substrate portion 30a Mounting substrate 30 b Extension portion 30c Left attachment hole 30d Right attachment hole 31 Spring 32 Operation arm 32a Operation portion 32a1 First operation portion 32a2 Second operation portion 32b Arm portion 32c Mounting portion 33 Window hole 33L Left window hole 33R Right window hole 34 mounting hole 35 stop hole 36 mounting hole 36a first mounting hole 26b second mounting hole 37 mark

Claims (5)

It is an outrigger device composed of auxiliary legs attached to the post of an aerial work device,
The auxiliary leg (7) includes a support leg (10) extending from a pivot part (9) pivotally connected to the support column via a main shaft (8), and the support leg is extended along the support column (4). It is configured to be rotatable between a closed leg posture (P1) that is an upward posture and an open leg posture (P2) that is reversed from the closed leg posture and is a downward inclined posture,
The posture lock device (13) is configured by providing the auxiliary leg (7) with the locked means (11) and by providing the support (4) with the locking means (12),
The locked means (11) includes a fixed arm (15) extending from the pivot portion so as to rotate integrally with the support leg, and an open leg lock tooth (17) provided on the fixed arm. Provided, when the support leg is in an open leg posture (P2), the leg lock teeth (17) are configured to protrude toward the inside of the column,
The locking means (12) includes a lock arm (19) pivotally connected to a support column via a swing shaft (18) facing the fixed arm, and an open leg lock claw ( 21), and when the support leg is in the open leg position (P2), the open leg lock claw (21) is configured to detachably engage with the open leg lock tooth (17),
The locking means (12) is provided with a spring (22) for urging the lock arm (19) in a rotational direction from the inner side to the outer side of the column, and the leg locking teeth (17) are An outrigger device in an aerial work device, characterized in that the open leg lock claw (21) is engaged with the arm in the rotational direction. The lock arm (19) relates to an arc (M2) defined by a radius (R2) from the center of the swing shaft (18), and the leg locking claw ( 17)
The fixed arm (15) is defined by a radius (r2) from the center of the main shaft (8), and the lock arm is in the open leg position (P2) with respect to an arc (m2) intersecting the arc (M2). The leg locking teeth (21) are provided facing the portion where the arc (M2) of the arm and the arc (m2) of the fixed arm intersect,
The said leg locking claw (21) is comprised so that it may latch on the said leg locking tooth (17) when a support leg is made into an open leg attitude | position (P2), The structure of Claim 1 characterized by the above-mentioned. Outrigger device for high-altitude work equipment. The open leg lock teeth (17) provided on the fixed arm (15) are arranged in the extending direction of the fixed arm with a plurality of teeth that allow the leg angle of the support leg in the open leg position (P2) to be freely selected. And
The plurality of teeth includes a standard tooth (17a) positioned on the locus with respect to the swing locus (M2) of the open leg lock claw (21) around the swing shaft (18), and the locus ( The outrigger device in an aerial work device according to claim 1 or 2, comprising at least one selection tooth (17b, 17c) located inside or outside of M2). The lock arm (19) has two first arcs (M1) defined by two first radii (R1) and second radii (R2) that are different in distance from the center of the swing shaft (18) and the first arc (M1). With respect to the two arcs (M2), the closed leg locking claw (16) is provided so as to swing along the first arc (M1), and the open leg locking claw so as to swing along the second arc (M2). (17)
The fixed arm (15) is defined by two first radii (r1) and second radii (r2) that are different in distance from the center of the main shaft (8), and intersects the circular arcs (M1) (M2), respectively. For the first arc (m1) and the second arc (m2), the first arc (M1) of the lock arm and the first arc (m1) of the fixed arm intersect when the support leg is in the closed leg position (P1). Closed leg locking teeth (20) are provided facing the part, and the second arc (M2) of the lock arm and the second arc (m2) of the fixed arm intersect when the support leg is in the open leg position (P2). Facing the open leg locking teeth (21),
When the support leg is in the closed leg position (P1), the closed leg lock claw (20) is locked to the closed leg lock tooth (16), and when the support leg is in the open leg position (P2), the open leg lock claw (21 The outrigger device in an aerial work device according to claim 1, 2 or 3, characterized in that it is configured to be engaged with said open leg lock teeth (17). The auxiliary leg (7) is closed by the locking hole (27) penetrating the column (4) and the locking projection (28) of the base plate (30) pivotably connected to the auxiliary leg (7). It constitutes a closed leg lock device (26) for releasably locking the locking projection in the locking hole when it is in the posture (P1),
The locking projection (28) includes a protruding portion (28a) that can enter the locking hole, a guide portion (28b) having an inclined surface folded from the tip of the protruding portion, and a tip of the guide portion. With locking end (28c),
The substrate portion (30) is urged by a spring (31) in a rotation direction (R1) with the engaging end portion facing forward in the rotation direction, and an operation arm extended from the substrate portion. The operation part (32a) protrudes from the window hole (33) formed in the auxiliary leg, and is configured to be able to rotate in the reverse rotation direction (R2) against the spring via the operation part. ,
When the closed leg posture (P1) with the auxiliary leg overlaid on the support post is used, the locking edge (27a) of the locking hole (27) presses the guide portion (28b), so that the substrate portion and the locking projection are used as a spring. When the locking projection (28) is inserted into the locking hole (27) by rotating it in the reverse rotation direction (R2) against it, and the guide portion (28b) gets over the locking edge (27a), the substrate The locking end (28c) is locked at a position displaced from the locking edge by rotating the part and the locking protrusion back in the rotation direction (R1) with a spring, and the locking protrusion (28) is engaged. 5. The outrigger device in an aerial work device according to claim 1, wherein the outrigger device is configured to be locked to the stop hole (27) so as not to escape.

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