JP2017172219A - Expansion lock device in expansion leg device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion lock device of an expansion leg device provided in a high place work device.SOLUTION: In a constitution for providing lever lock means for non-reversibly locking a main lever, by rotating a sub-lever (16) rotatably journaled to the main lever via a sub-shaft (15) to an immovable position (P2) from a movable position (P1) by locking a locking tooth of the main lever by elastically-repulsively energizing the main lever rotatably journaled to the other fixing part via a main shaft (13) in the normal rotation direction by a spring to a rack tooth provided in one of a main leg and an expansion leg, the sub-lever (16) is provided with a flexible tongue piece (31) having an abutting surface (35) along a circumference (C), with a place of facing to elastic support means (28) as a lock position (M1) on the circumference (C) having a predetermined radius (R) with the sub-shaft (15) as the center and with a place of crossing with an outer peripheral surface of the main shaft (13) as a pressure contact position (M2).SELECTED DRAWING: Figure 7

Description

The present invention relates to a telescopic lock device in a telescopic leg device provided in a high place working device such as a stepladder, a work table, or a ladder.

2. Description of the Related Art Conventionally, a telescopic leg device in an altitude work device such as a stepladder is composed of a main leg and telescopic legs that are slidable along the main leg. In addition to providing rack teeth, a bracket attached to the main leg is provided with a main lever provided with locking teeth that are detachably locked with respect to the rack teeth, thereby constituting an extension lock device.

Therefore, if the telescopic lock device is unlocked and the telescopic leg is slid to lock the telescopic lock device again in a state where the leg body has a predetermined length, the operator's boarding position can be set as desired. It is possible to work at a high place in the height state.

The main lever is pivotally supported via a main shaft so as to be able to rotate in the forward and reverse directions, and is always elastically biased by a spring in the forward rotation direction for locking the locking teeth to the rack teeth. It is preferable to provide a secondary lever that is pivotally supported via a secondary shaft.

The sub-lever is rotatable forward and backward between a movable position that contacts the driven portion of the main lever and a non-movable position that is separated from the driven portion.

Therefore, when the user pushes the knob formed on the tail end portion of the sub lever with the fingertip while the sub lever is rotated to the movable position, the main lever together with the sub lever is easily resisted against the spring. Can be rotated in the reverse direction, and the operability for releasing the locking of the telescopic lock device is improved.

On the other hand, when the auxiliary lever is rotated to the non-movable position, the stopper provided on the auxiliary lever and the arm provided on the bracket are opposed to each other. Lock the lever so that it cannot be reversed. That is, the stopper and the arm constitute a lever lock means for preventing the reverse rotation of the main lever, thereby preventing the danger that the telescopic lock device is inadvertently released during the operation.

JP 2011-226061 A

According to Patent Document 1 previously proposed by the present applicant, by providing the sub-lever, the operation of the main lever for releasing the locking of the telescopic locking device is easy, and at the time of locking the main lever There is an advantage of ensuring safety by lever lock means for preventing reverse rotation.

However, in order to make the prior art highly complete, it is preferable to make further improvements. For example, in the case of the above-described configuration, in relation to the design and manufacture of the telescopic lock device, a predetermined condition exists between the stopper of the sub lever that constitutes the lever locking means and the bracket with the arm that receives the stopper. Since this is necessary, there is a restriction on the overall design of the aerial work apparatus, and high-precision work is also required for the assembly of parts. Furthermore, as a new problem, it is desirable to give a click feeling to the user's fingertip when the sub-lever is rotated between the movable position and the non-movable position from the needs of the field.

In view of the above, the present invention is capable of unitizing the main lever and the main shaft, the sub lever and the sub shaft, and the spring out of the components of the telescopic locking device without being restricted by the design of the bracket. By simply mounting the unit at a predetermined location, the lever locking means as described above can be easily realized, and the unit itself can provide a click feeling and positioning at the movable position and the non-movable position of the sub-lever. An apparatus that enables this is provided.

Therefore, the present invention is configured as a means, with respect to a telescopic leg device comprising a main leg and a telescopic leg that is slidable along the main leg, it is arranged in one of the main leg and the telescopic leg in the sliding direction. A telescopic lock device provided with a plurality of provided rack teeth and releasably locking the locking teeth of the main lever from the fixed portion fixed to the other to the rack teeth, wherein the main lever is It is pivotally supported via a main shaft provided in the fixed portion so that it can freely rotate in the forward and reverse directions. When it is rotated in the forward rotation direction, the locking teeth are locked to the rack teeth, and when it is rotated in the reverse rotation direction, The locking teeth are separated from the rack teeth, and are elastically biased in the forward direction by a spring elastically contacted with the elastic support means of the fixed portion, and the main lever is driven by a secondary shaft. Forward / reverse rotation between a movable position that contacts the part and a non-movable position that is separated from the driven part A sub-lever pivotally supported is provided, and when the sub-lever is rotated to the movable position, the main lever can be rotated in the reverse direction, and when the sub-lever is rotated to the non-movable position, the main lever is rotated. In the configuration comprising lever locking means for locking the lever so as not to rotate in the reverse rotation direction, the auxiliary lever has a portion facing the elastic support means on a circumference having a predetermined radius around the auxiliary shaft. A flexible tongue piece having a contact surface along the circumference is provided with a position that intersects the outer peripheral surface of the main shaft as a pressure contact position, and the tongue piece is formed by rotating a sub lever. When moving to the press contact position, the contact surface is deformed by press contact with the outer peripheral surface of the main shaft, and when the sub lever is rotated to the movable position, the main shaft is moved over to the main shaft and click recovery is performed. Forming the deputy When rotating the over to non-moving position lies in comprising configured to form a positioning means for the non-moving position by clicking restored over the spindle.

In an embodiment of the present invention, the tongue piece constitutes the lever lock means by moving to the lock position when the sub lever is rotated to the non-movable position.

Preferably, the auxiliary lever includes a bearing plate pivotally supported by the auxiliary shaft, the tongue piece extends from the bearing plate, and a circumferential groove is formed between the bearing plate and the tongue piece. The tongue piece is displaced in the axial direction of the auxiliary shaft with respect to the bearing plate.

According to the present invention, the telescopic lock device 9 can be unitized by the main lever 14 and the main shaft 13, the sub lever 16 and the sub shaft 15, and the spring 17. The design of the unit 9 is not restricted, the design as a unit is simple and easy, and the lever lock means 30 can be realized simply by attaching the unit to a predetermined portion of the fixing unit 9. There is an effect.

In particular, by providing a flexible tongue piece 31 on the sub lever 16, the unit itself enables a click feeling at the movable position P1 and the non-movable position P2 of the sub lever 16, and positioning means 31a and 31b are provided. There is an advantage that it can be configured.

It is a perspective view which shows the stepladder as an example of the aerial work apparatus which implemented the expansion-contraction leg apparatus provided with the expansion-contraction lock apparatus of this invention. It is sectional drawing which expands and shows the part shown by the arrow E of FIG. It is a perspective view which shows the component of an expansion-contraction lock apparatus in an exploded state. It is a perspective view which shows the unit of the state which assembled | attached the component part of the expansion-contraction lock apparatus which concerns on one Embodiment of this invention. The relationship between the auxiliary lever supported by the auxiliary shaft, the main shaft, and the elastic support means is shown, (A) is a perspective view, (B) is a side view, (C) is a cross-sectional view along the line AA, ( D) is a sectional view showing a state in which the tongue piece is deformed by being pressed against the main shaft. Regarding the operation of the telescopic locking device, (A) is a cross-sectional view showing a state in which the main lever is elastically biased in the forward rotation direction by a spring while the sub lever is rotated to the movable position, and (B) is a sub-sectional view. It is sectional drawing which shows the state which reversed the main lever against the spring by pushing the knob of the tail end part of a lever. (A) is sectional drawing which shows the state which moved the tongue piece to the press-contact position by rotating an auxiliary | assistant lever from a movable position toward a non-movable position regarding the effect | action of an expansion-contraction locking device, (B) is a BB line. It is an expanded sectional view. Regarding the operation of the telescopic locking device, (A) is a cross-sectional view showing a state where the sub-lever is rotated to the non-movable position, and (B) is a cross-sectional view showing a restraining means that effectively functions the tongue piece as the lever lock means. is there.

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

The drawing shows a stepladder as an example of an aerial work apparatus. However, it is understood that the present invention is not limited to a stepladder, and may be an altitude work device for an operator to work at a high place, such as a work table or a ladder, and can be widely implemented. I want.

The stepladder illustrated in FIG. 1 includes a first leg 1a and a second leg 1b arranged on the left and right, and the upper ends of both legs 1a and 1b are pivoted to each other by a pivoting means (not shown). By doing so, there is provided a detachable locking device 2 that is configured to be openable and closable and connected in an open state.

The first leg 1a and the second leg 1b are each formed in a ladder shape with a top plate 3 and a plurality of step bars 4a, 4b provided between a pair of leg posts 1c, 1c. The main leg 5 and the extendable leg 6 slidably fitted into the main leg 5 constitute an extendable leg device.

As shown in FIG. 2, the telescopic leg 6 is provided with a belt-like rack 7 having a large number of rack teeth 7 a arranged in the sliding direction, and the main leg 5 is connected to the main leg 5. An expansion / contraction lock device 9 is provided that is detachably engaged with the teeth 7a of the rack 7 from the fixed portion 8 that is fixed. In the case of the illustrated example, a lower step rail 4a is fixedly provided near a lower end portion of the main leg 5 via a bracket 10, and the fixing portion 8 is constituted by both the bracket 10 and the step rail 4a. .

The main leg 5, the telescopic leg 6, and the step bar 4a are each formed of an extruded material of aluminum. The main leg 5 is formed by a cross-sectional groove-shaped member that opens toward the inner side of the pedestal 1c, and a guide cylinder 11 is fixed to a lower end portion thereof, and the extendable leg 4a is formed in a rectangular tube shape. The guide cylinder 11 is inserted into the main leg 5 so that the rack 7 faces the groove of the main leg 5.

The step rail 4a is formed in a generally rectangular tube shape, and is provided with rail-like ribs 12 and 12 that are parallel to the lower surface, and the end portion of the step rail 4a faces the groove portion of the main leg 5. In this state, the brackets 10 and 10 are fixed to both outer surfaces of the main leg 5.

Regarding the rack 7 and the telescopic lock device 9, the illustrated embodiment shows a configuration in which the rack 7 is provided on the telescopic leg 6 and the telescopic lock device 9 is provided on the fixing portion 8 of the main leg 5. The rack 7 may be provided on the main leg 5 and the expansion / contraction lock mechanism 9 may be provided on the fixing portion of the expansion / contraction leg 6. What is necessary is just the structure which provides the expansion-contraction locking device 9 which engages with the rack tooth | gear 7a detachably from the fixing | fixed part side.

(Extension lock device)
As shown in FIGS. 2 to 4, the telescopic lock device 9 includes a main lever 14 that is pivotally supported by the fixed portion 8 via a main shaft 13 so as to be rotatable forward and backward, and a sub-shaft 15 attached to the main lever 14. A sub-lever 16 that is pivotally supported so as to rotate forward and backward, and a spring 17 that elastically urges the main lever 14 in the forward rotation direction so as to be unitized.

(Main lever)
The main shaft 13 is constituted by a pipe shaft 13a disposed between the shaft holes 18 and 18 of the brackets 10 and 10, and is attached to the brackets 10 and 10 by a mounting shaft 19 such as a bolt inserted through the pipe shaft 13a. Is done. The main lever 14 may be configured to rotate around the mounting shaft 19 integrally with the main shaft 13. However, in the illustrated embodiment, the main lever 14 is configured to rotate about the main shaft 13.

The main lever 14 includes a bearing portion 20 that is pivotally supported by the main shaft 13, an arm 21 that extends from the bearing portion 20 toward the rack 7, and a driven portion 22 that extends toward the lower surface of the tread bar 4a. The arm 21 is provided with locking teeth 23, and an insertion portion 24 for inserting and supporting the auxiliary shaft 15 is provided between the bearing portion 20 and the driven portion 22.

The spring 17 is positioned on both sides of the main lever 14 and is paired with a pair of coil portions 25 and 25 that are extrapolated to the main shaft 13, and an urging portion 26 that extends from one end of both coil portions and is connected in a gate shape. A resilient support 27 extending from the other end, abutting the urging portion 26 against the upper surface of the driven portion 22 of the main lever 14, and the resilient support 27 being constituted by the lower surface of the tread bar 4a. It is configured to elastically contact the means 28.

As shown in FIGS. 2 and 4, in a state where the main shaft 13 is attached to the brackets 10 and 10 by the attachment shaft 19, the main lever 14 is pushed down by the spring 17 as shown by the arrow D in the drawing by the spring 17. As a result, it is urged to rotate in the forward rotation direction A 1, and the locking teeth 23 of the arm 21 are locked to the rack teeth 7 a of the rack 7. Therefore, when the driven portion 22 is pushed up against the spring as indicated by the arrow U, the locking teeth 23 are detached from the rack teeth 7a by rotating in the reverse rotation direction A2.

(Sub lever)
The sub lever 16 includes a pair of bearing plates 29 and 29 that are pivotally supported at both ends of the sub shaft 15 inserted into the insertion portion 24 of the main lever 14, and a lever lock provided on an outer peripheral portion of the bearing plate 29. A means 30 and a tongue 31 and a plate-like arm 32 extending from the bearing plate 29 are provided, and a recess 33 is formed on the upper surface of the arm 32.

As shown in FIGS. 2 and 4, the sub lever 16 is pivotally supported via the sub shaft 15 so as to be rotatable in the forward rotation direction B 1 and the reverse rotation direction B 2, and the main lever 14 is supported in the recess 33 of the arm 32. Rotation between a movable position P1 (see FIG. 6) brought into contact with the driven portion 22 being received and an unmovable position P2 (see FIG. 8) separating the arm 32 from the driven portion 22 It is free.

In the state where the sub lever 16 is rotated to the movable position P1 shown in FIG. 2, the arm 32 is overlapped with the lower surface of the driven portion 22 of the main lever 14, and the main lever 14 is rotated in the reverse rotation direction A2. Function as an operation piece. That is, when the locking teeth 23 are detached from the rack teeth 7a, the user can easily rotate the main lever 14 against the spring 17 by pushing up the plate-like arm 32 with the fingertip.

The sub lever 16 is integrally formed of a flexible plastic material, and the tongue piece 31 is provided on the outer peripheral portion of the bearing plate 29 as described above. As shown in FIG. 5, a circumferential groove 34 is formed between the bearing plate 29 and the tongue piece 31, and the tongue piece 31 is displaced in the axial direction of the auxiliary shaft 15 with respect to the bearing plate 29. In the case of the illustrated embodiment, circumferential grooves 34 are formed on both outer sides of the pair of bearing plates 29, 29, and the tongue pieces 31, 31 are displaced in an inclined state toward the outer side.

As shown in FIG. 5 (B), the tongue piece 31 faces the elastic support means 28 on the lower surface of the tram 4a on the circumference with respect to a circumference C having a predetermined radius R around the auxiliary shaft 15. A contact surface 35 is formed along the circumference C, with the location being the lock position M1 and the location intersecting the outer peripheral surface of the main shaft 13 being the pressure contact location M2. Therefore, when the tongue piece 31 is moved to the pressure contact position M2 by the rotation of the sub lever 16, the tongue piece 31 is deformed by pressing the contact surface 34 against the outer peripheral surface of the main shaft 13. For this reason, when the sub lever 16 is rotated forward B1 from the movable position P1 to the non-movable position P2, the tongue 31 moves over the main shaft 13 with deformation, and then clicks to restore the positioning of the non-movable position. On the contrary, when the sub-lever 16 is rotated in the reverse direction B2 from the non-movable position P2 to the movable position P1, the tongue piece 31 moves over the main shaft 13 with deformation, and then moves by restoring the click. A position positioning means is formed.

The click restoration is an operation for instant restoration from a deformed state with a tactile click feeling. As shown in FIG. 5D, the tongue piece 31 has a contact surface 35 on the main shaft 13. When it is pressed against the bearing plate 29, it is deformed from the state of being deviated with respect to the bearing plate 29 through the circumferential groove 34, and when it is released from the pressure contact state, it is instantaneously restored.

In the case of the illustrated embodiment, the bearing plate 29 of the sub lever 16 is provided with a circumferential protrusion 36 adjacent to the tongue piece 31 in the normal rotation direction B1. The circumferential protrusion 36 is configured to pass through the outer peripheral surface of the main shaft 13 without being pressed when the sub lever 16 is rotated, and the sub lever 16 is not movable as shown in FIG. When rotating to the position P2, both the tongue piece 31 and the circumferential protrusion 36 are exposed to the elastic support means 28 formed on the lower surface of the step rail 4a. Therefore, in the case of the illustrated embodiment, the lever locking means 30 that locks the main lever 14 so as not to rotate in the reverse rotation direction A <b> 2 is constituted by the tongue piece 31 and the circumferential protrusion 36. However, the lever lock means 30 does not necessarily need to be constituted by both the tongue piece 31 and the circumferential protrusion 36, and may be constituted by at least one of them.

At this time, since the lever lock means 30 constituted by the tongue piece 31 can be bent and deformed via the circumferential groove 34 as described above, as shown in FIG. It is preferable to provide a restraining means 37 that effectively functions as In the case of the illustrated example, when a pair of rail-like ribs projecting from the lower surface of the foot 4a constituting the fixed portion 8 constitute the restraining means 37, 37, and the sub lever 16 is rotated to the non-movable position P2. The tongue pieces 31, 31 are configured to enter between the restraining means 37, 37 composed of a pair of ribs. Therefore, even when the tongue piece 31 is pushed up together with the main lever 14 from this state and pressed against the bottom surface of the fixing portion 8, the tongue piece 31 is not deformed, thereby suitably preventing the reverse rotation of the main lever 14. .

(Function)
The action of the telescopic lock device 9 is shown in FIGS. FIG. 6 shows a state where the sub lever 16 is rotated to the movable position P1, and as shown in FIG. 6 (A), the main lever 14 is rotated forward by receiving the elastic biasing force of the spring 17. It shows a state in which it is biased toward the direction A1, the locking teeth 23 are locked to the rack teeth 7a, and the telescopic legs 6 are locked so as not to slide. From this state, as shown in FIG. 6B, when the arm 32 of the sub lever 16 is pushed up as an operation piece, the main lever 14 can be rotated in the reverse rotation direction A2 against the spring 17, This enables sliding of the telescopic legs 6.

In order to lock the main lever 14 so that the main lever 14 cannot rotate in the reverse rotation direction A2 with the telescopic leg 6 locked so as not to slide, the sub lever 16 is directed toward the non-movable position P2 shown in FIG. It rotates in the forward rotation direction B1.

During the rotation of the sub-lever 16, the tongue piece 31 is pressed against the outer peripheral surface of the main shaft 13 and deformed as shown in FIG. Therefore, even if the sub lever 16 is stopped in this state, the main lever 14 is difficult to rotate with respect to the main shaft 13, and even when an external force that overcomes the spring 17 is applied, the reverse direction is reversed. There is no rotation to A2.

When the sub-lever 16 is further rotated toward the non-movable position P2, the click piece is restored as soon as the tongue piece 31 gets over the main shaft 13, thereby constituting a positioning means for the non-movable position P2. As shown in FIG. 8, the circumferential end of the tongue piece 31 that has passed over the main shaft 13 faces the outer peripheral surface of the main shaft 13 to constitute the positioning means 31a. Therefore, the auxiliary lever 16 can be easily moved in the reverse rotation direction B2. Is positioned so as not to rotate.

The lever lock means 30 of the sub-lever 16 faces the elastic support means 28 formed on the lower surface of the traverse 4a in a state where it is rotated to the non-movable position P2, and thereby the reverse direction A2 of the main lever 14 is reached. The rotation of the is prevented. That is, the rotation of the main lever 14 in the reverse rotation direction A2 is prevented by the lever lock means 30 coming into contact with the elastic support means 28, so that the locking teeth 23 of the main lever 14 are disengaged from the rack teeth 7a. There is no.

By the way, when it is necessary to disengage the locking teeth 23 of the main lever 14 from the rack teeth 7a in order to expand and contract the telescopic legs 6, the sub lever 16 is again rotated to the movable position P1 shown in FIG. In this case as well, the tongue 31 is deformed while being pressed against the outer peripheral surface of the main shaft 13 during the rotation, and as soon as the tongue piece 31 gets over the main shaft 13, the click piece is restored to constitute a positioning means for the movable position P1. As shown in FIG. 6A, the circumferential end of the tongue piece 31 that has passed over the main shaft 13 faces the outer peripheral surface of the main shaft 13 to form the positioning means 31b. It is positioned so as not to rotate in the forward rotation direction B1.

As shown in FIG. 4, the telescopic locking device 9 configured as described above includes a main lever 14 that is pivotally supported via a main shaft 13 so as to be rotatable forward and backward, and a main shaft 14 via a sub shaft 15. The unit can be unitized by the sub lever 16 that is pivotally supported so as to rotate forward and backward and the spring 17 that elastically urges the main lever 14 in the forward rotation direction, and the click restoring and positioning means 31a and 31b are provided. The tongue piece 31 to be formed can be provided easily and simply by considering the positions of the main shaft 13 and the sub shaft 15 and the circumference C when designing the unit. That is, there is no restriction that requires consideration of the relationship between the crosspiece 4a and the bracket 10 that constitute the fixed portion 8 of the aerial work platform.

When attaching the unitized telescopic locking device 9, it is only necessary to consider the mounting position of the main shaft 13 with respect to the fixed portion 8 (in the illustrated embodiment, the position of the shaft hole 18 of the bracket 10). By utilizing the ball support means 28 for elastic contact, it is possible to make the lever lock means 30 function, and the work required for mounting is simple and easy.

DESCRIPTION OF SYMBOLS 1a 1st main leg 1b 2nd main leg 1c Pillar 2 Stopper device 3 Top plate 4a, 4b Foot 5 Main leg 6 Telescopic leg 7 Rack 7a Rack tooth 8 Fixing part 9 Telescopic lock apparatus 10 Bracket 11 Guide cylinder 12 Rib 13 Main shaft 13a Pipe shaft 14 Main lever 15 Sub shaft 16 Sub lever 17 Spring 18 Shaft hole 19 Mounting shaft 20 Bearing portion 21 Arm 22 Driven portion 23 Locking tooth 24 Insertion portion 25 Coil portion 26 Energizing portion 27 Elastic support portion 28 Elastic support Means 29 Bearing plate 30 Lever lock means 31 Tongue piece 31a Non-movable position positioning means 31b Movable position positioning means 32 Arm 33 Recess 34 Circumferential groove 35 Contact surface 36 Peripheral protrusion 37 Restraint means

Claims (3)

A telescopic leg device comprising a main leg and a telescopic leg slidable along the main leg is provided with a plurality of rack teeth (7a) arranged in the sliding direction on one of the main leg and the telescopic leg. The telescopic lock device for releasably locking the locking teeth (23) of the main lever (14) from the fixed portion (8) fixed to the other to the rack teeth,
The main lever (14) is pivotally supported via a main shaft (13) provided in the fixed portion so as to be able to rotate forward and backward, and when the main lever (14) is rotated in the forward rotation direction (A1), the locking teeth are rack teeth. And when it is rotated in the reverse rotation direction (A2), the locking teeth are detached from the rack teeth, and are rotated forward by a spring (17) elastically contacted with the elastic support means (28) of the fixed portion. It is energized in the direction (A1)
Between the movable position (P1) that contacts the driven portion (22) of the main lever via the countershaft (15) and the non-movable position (P2) that is separated from the driven portion (22) A sub-lever (16) pivotally supported forward and reverse is provided, and the sub-lever can rotate the main lever in the reverse direction (A2) when rotated to the movable position (P1). In the configuration comprising the lever lock means (30) for locking the main lever so as not to rotate in the reverse rotation direction (A2) when rotated to the immovable position (P2),
The sub lever (16) has a lock position (M1) at a position facing the elastic support means (28) on a circumference (C) having a predetermined radius (R) with the sub shaft (15) as a center. The portion that intersects the outer peripheral surface of the main shaft (13) is a pressing position (M2), and a flexible tongue piece (31) having a contact surface (35) along the circumference is provided,
When the tongue (31) is moved to the pressure contact position (M2) by rotation of the auxiliary lever, the tongue piece (31) is deformed by pressing the contact surface against the outer peripheral surface of the main shaft, and the auxiliary lever is moved to the movable position (P1). ) To move over the main shaft and restore the click to form a movable position positioning means (31b), and when the sub-lever rotates to the non-movable position (P2), over the main shaft and click to restore The telescopic lock device in the telescopic leg device, characterized in that it is configured to form positioning means (31a) at a non-movable position. The tongue piece (31) constitutes the lever lock means (30) by moving to the lock position (M1) when the sub lever (16) is rotated to the non-movable position (P2). The telescopic lock device in the telescopic leg device according to claim 1. The auxiliary lever (16) includes a bearing plate (29) supported by the auxiliary shaft (15), and the tongue piece (31) extends from the bearing plate,
A circumferential groove (34) is formed between the bearing plate (29) and the tongue piece (31), and the tongue piece (31) is arranged in the axial direction of the auxiliary shaft (15) with respect to the bearing plate (29). The telescopic locking device in the telescopic leg device according to claim 1 or 2, wherein the telescopic locking device is displaced.

Images