KR20050030116A - Construction equipment - Google Patents

Abstract

A construction machine is provided to improve convenience by stepping on a pedal easily in separating a stopper frame from the pedal and using the pedal as a footrest in locking the pedal, and to cut down manufacturing cost by reducing the number of parts. A pedal locking apparatus(21) is composed of a stopper frame(22) surrounding a pedal(15) and a hinge member(23) supporting the stopper frame. A footboard(18) is pressed and fitted by a horizontal frame part(22B) of the stopper frame in spite of stepping on a tread(18B) of the footboard in moving the stopper frame for locking, and the pedal is used as a footrest. The horizontal frame part is separated from the pedal in moving the stopper frame for unlocking the pedal, and the pedal is pressed. A foot of an operator is placed on a pedal surface of the pedal in stepping on the pedal or using the pedal as the footrest.

Description

Construction machinery {CONSTRUCTION EQUIPMENT}

TECHNICAL FIELD This invention relates to construction machines, such as a hydraulic excavator, for example. Specifically, It is related with the construction machine provided with the operation pedal apparatus in the front side of a driver's seat.

Generally, construction machines, such as a hydraulic excavator, are comprised substantially by the lower traveling member which can run self, the upper pivot member mounted pivotably on the said lower traveling member, and the work device provided in the front part side of the said upper pivot member. have. In addition, a traveling lever and a traveling pedal for driving the lower traveling member are provided on the front side of the driver's seat disposed on the bottom plate of the upper swing member, and operation levers for operating the work device are provided on both left and right sides of the driver's seat. have.

On the other hand, for example, in order to efficiently excavate a road side groove or the like, a hydraulic shovel having a side groove channel specification in which a work device can swing or offset in a horizontal direction is known. The hydraulic excavator of the side groove channel specification has a configuration in which an operation pedal device is provided on the front side of the driver's seat and the operator can control the swing operation of the work device by stepping-in the pedal of the operation pedal device. See, for example, Patent Document 1).

[Patent Document 1]

Japanese Patent Laid-Open No. 11-336129

The above-mentioned prior art is provided with the pedal cover which moves between the lock position which prohibits a depression operation with respect to a swing operation pedal, and the lock release position which allows a depression operation. When the swing operation of the work device is not performed, the pedal cover is in the locked position and the operation pedal is covered from above to prevent the operator from inadvertently injecting the swing operation pedal. In addition, when the pedal cover is in the locked position and the pedal is covered, the pedal cover is configured to function as a foot rest on which the operator rests his foot.

However, since the pedal cover according to the prior art mentioned above functions as a foot rest when the pedal of the operation pedal device is covered from above, the height position of the upper surface of the pedal cover which becomes this foot rest becomes higher than the height position of the pedal upper surface. For this reason, the position of a foot when an operator places a foot on the upper surface of a pedal cover becomes higher than the position of a foot when operating a pedal, and there exists a problem that a discomfort is given to an operator.

In addition, when an operator places his foot on the top of the pedal cover, the foot rest, the non-slip member is fixedly attached to the top of the pedal cover, or the non-slip processing is performed on the top of the pedal cover to prevent the foot from slipping. It is necessary and there exists a problem that the manufacturing cost rises.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a construction machine capable of maintaining a substantially constant height position of an operator's foot when depressing a pedal and using a pedal as a foot rest. have.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a self-driving vehicle body provided with a work device, a driver's seat provided on a bottom plate of the vehicle body, and a pedal provided at a front side of the driver's seat and provided with a pedal surface at an upper surface side. It is applied to a construction machine comprising an operation pedal device and a pedal lock device that moves between a lock position forbidding operation of a pedal of the operation pedal device and a lock release position for allowing operation.

And a feature of the invention of claim 1, the pedal lock device is a stopper frame formed in a frame shape surrounding the pedal surface of the pedal, and the bottom plate with respect to the bottom plate rotatably supporting between the lock position and the unlocking position It is comprised by the frame support member.

In the invention of claim 2, the stopper frame is formed as a frame corresponding to the shape of the pedal by bending one bar member.

According to the invention of claim 3, the pedal has a pedal surface positioned at the center portion in the longitudinal direction and a coupling portion to which the stopper frame engages when the pedal lock device is in the locked position, positioned on both sides of the longitudinal direction with the pedal surface interposed therebetween. There is one in composition.

According to a fourth aspect of the present invention, the pedal is constituted by a bracket attached to a pilot valve generating a pilot pressure, and a footrest that is superimposed on an upper side of the bracket and provided with a pedal surface on an upper surface thereof.

According to a fifth aspect of the present invention, a pedal holder for holding the pedal in an operating state is provided in the bracket of the pedal.

EMBODIMENT OF THE INVENTION Hereinafter, the case where the embodiment of the construction machine which concerns on this invention is applied to a hydraulic excavator is demonstrated in detail, referring FIGS. 1-12. First, Figs. 1 to 9 show a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine to be applied to the present embodiment, and the hydraulic excavator 1 pivots on the crawler-type lower traveling member 2 and the lower traveling member 2 which can run on their own. An operation for excavating the earth and sand, which is mounted so as to be capable of moving up and down on the front pivot side of the upper pivot member 3 constituting the vehicle body together with the lower traveling member 2 and the upper pivot member 3. It is roughly comprised by the apparatus 4.

Here, the upper swing member 3 includes a swing frame 5 serving as a base, a driver's seat 8 to be described later disposed on the swing frame 5, and an engine provided on the rear side of the swing frame 5. And the counter weight 6 provided on the rear side of the revolving frame 5 and balancing the weight with the working device 4.

In addition, the work device 4 includes a swing post 4A provided on the front end of the swing frame 5 so as to be able to swing in the left and right directions, a boom 4B installed in the swing post 4A so as to be able to move in a buoyant manner, and It is comprised by arm 4C rotatably provided in the front end side of the boom 4B, and bucket 4D rotatably provided in the front end side of the said arm 4C.

Further, a boom cylinder 4E is provided between the swing post 4A and the boom 4B, an arm cylinder 4F is provided between the boom 4B and the arm 4C, and the arm 4C and the bucket ( The bucket cylinder 4G is provided between 4D). As shown in Fig. 2, between the swing frame 5 and the swing post 4A, a swing cylinder 4H for swinging the swing post 4A in the left and right directions is provided, and the swing cylinder 4H is provided. It is operated by the operation pedal apparatus 12 mentioned later.

Reference numeral 7 denotes a bottom plate provided on the swing frame 5, which is formed by, for example, a flat plate made of a metal material and extends in the horizontal direction. The upper surface of the bottom plate 7 is covered with a floor mat (not shown) made of a rubber material or the like.

Reference numeral 8 denotes a driver's seat installed on the bottom plate 7, and the driver's seat 8 is seated by an operator who controls the hydraulic excavator 1. And the operation lever device 9 etc. (shown on the left side only) are arrange | positioned at the left and right both sides of the driver's seat 8, and the operator seated in the driver's seat 8 operates the operation lever device 9, and the upper pivot member 3 ), Excavation work of earth and sand by the work device 4 is performed. In addition, the upper part of the driver's seat 8 is covered by the canopy 10.

Reference numeral 11 denotes left and right travel pedals and lever devices positioned at the front side of the driver's seat 8 and disposed at the center of the front portion of the bottom plate 7, wherein each of the travel pedals and lever devices 11 is a lower travel member 2. It is operated when driving). The traveling pedal and lever device 11 includes a pilot valve (not shown) attached to the bottom plate 7, a traveling pedal 11A attached to the pilot valve so as to swing in the front-rear direction, and the traveling pedal ( It is roughly comprised by the travel lever 11B attached so as to interlock with 11A).

Reference numeral 12 denotes an operation pedal device for the swing cylinder 4H, which is located at the front side of the driver's seat 8 and installed on the right side of the front part of the bottom plate 7, and the operation pedal device 12 is shown in Figs. As mentioned above, it is comprised as a hydraulic operation pedal apparatus which consists of a pilot valve 13, the pedal 15, etc. which are mentioned later, and is stepped-in by an operator seated in the driver's seat 8.

Reference numeral 13 denotes a pilot valve of a pressure reducing valve type attached to the bottom plate 7, wherein the pilot valve 13 is provided with a casing 13A and an upper end of the casing 13A as shown in FIG. It is roughly comprised by 13B, 13 C of pedal mounting plates installed in the said cover 13B so that it could rock left and right, and 13 A of right and left pushers 13D and 13D which were installed in the cover 13B so that a movement was possible in the up-down direction. have. In addition, the cover 13B is provided with a flange 13B1 protruding from the casing 13A to left and right sides, and the pilot valve 13 is fixed by attaching the flange 13B1 to the bottom plate 7 by bolts 14. Is attached to the bottom plate 7 in a state in which the pedal attachment plate 13C protrudes onto the bottom plate 7.

Then, the pilot valve 13 is a switching valve (not shown) for supplying pressure oil to the swing cylinder 4H by the pedal 15 to be described later stepped into the left and right directions and the left and right pushers 13D being selectively pressed and moved. Outputs a hydraulic pilot signal. Thereby, the expansion-contraction operation of the swing cylinder 4H is controlled according to the depression operation of the pedal 15, and it is set as the structure which can swing the swing post 4A to the left-right direction.

Reference numeral 15 denotes a pedal constituting the operation pedal device 12 together with the pilot valve 13. The pedal 15 is inclinedly rotated in the left and right directions by stepping in by an operator, and the operating force at this time is pilot valve 13. ) To pass. And the pedal 15 is comprised by the bracket 16 and the footrest 18 mentioned later as shown to FIG. 5 and FIG.

Numeral 16 is a bracket attached to the pilot valve 13, the bracket 16 is formed in a rectangular plate shape extending in the left and right direction as a whole by using a hydraulic steel sheet or the like, which is located in the center of the longitudinal direction (left and right directions) It is comprised by the board | substrate attachment part 16B, 16B which is located in the both sides of the longitudinal direction across 16 A of flat plates and 16 A of flat plates, and rises vertically upward from the said flat plate 16A. .

Here, the left and right bolt insertion holes 16C, 16C are provided in the flat plate portion 16A of the bracket 16, and the pilot valve 13 passes through the bolts 17 inserted into the bolt insertion holes 16C. The bracket 16 is fixed on the pilot valve 13 by screwing into 13 C of pedal mounting plates. Further, bolt insertion holes 16D are drilled in the left and right footrest attachment portions 16B and 16B of the bracket 16, respectively.

Reference numeral 18 denotes a scaffold attached to the bracket 16, and the scaffold 18 is formed in a rectangular plate shape that extends in the left and right direction as a whole using a slippery resin material such as rubber. The footrest 18 is inclined upwardly from the flat plate portion 18A located on both sides in the longitudinal direction with the flat plate portion 18A positioned at the center portion in the longitudinal direction (left and right directions) and the flat plate portion 18A interposed therebetween. It is comprised substantially by the vertical rise part 18B, 18B of right and left which rises vertically.

Here, the female screw holes 18C and 18C are screwed in the lower surface side of the left-right vertical rise part 18B which comprises the footrest 18, respectively, and the bolt which penetrated into each bolt insertion hole 16D of the bracket 16 was carried out. By inserting 19 into the female screw hole 18C of the footrest 18, the footrest 18 is attached to the footrest attachment part 16B of the bracket 16. As shown in FIG.

In addition, a rectangular pedal surface 18D located at the center portion in the longitudinal direction is provided on the upper surface side of the flat plate portion 18A constituting the scaffold 18, and the pedal surface 18D is a dashed-dotted line in FIGS. 3 and 4. As shown, the operator has a surface on which the foot F is placed. The pedal surface 18D is provided with an anti-slip member 18E composed of a plurality of protrusion-like members extending at a predetermined interval in the front-rear direction and extending in the left-right direction.

On the other hand, the upper surface side of the left and right vertical rising portions 18B constituting the footrest 18 are located on both sides in the longitudinal direction with the pedal surface 18D interposed therebetween, and when the stopper frame 22 described later is locked, Left and right coupling portions 18F and 18F are provided. Here, each engaging portion 18F extends obliquely upward from the pedal surface 18D as shown in FIGS. 3 and 6 and the contact surface 18F1 to which the horizontal frame portion 22B of the stopper frame 22 to be described later comes into contact. ) And a pair of left and right protrusions 18F2 which protrude at regular intervals in the horizontal direction on the contact surface 18F1 to sandwich the horizontal frame portion 22B of the stopper frame 22.

Reference numeral 21 denotes a pedal lock device provided in the vicinity of the operation pedal device 12. The pedal lock device 21 is connected to the stopper frame 22 and the hinge member 23, which will be described later, as shown in Figs. It is roughly composed by.

Reference numeral 22 denotes a stopper frame rotatably supported on the bottom plate 7 by using a hinge member 23, which will be described later. The stopper frame 22 is, for example, as shown in Figs. By bending a single bar member such as a round steel member, it is formed as a rectangular frame member that surrounds the periphery of the pedal surface 18D provided on the pedal 15 (footrest 18). Here, the stopper frame 22 is located on the front side of the pedal 15 and is fixed to the hinge member 23, the front frame portion 22A and the left and right extending rearward from both end portions of the front frame portion 22A. It is roughly comprised by the horizontal frame parts 22B and 22B of the rear frame part 22C which connects the rear end part of each said horizontal frame part 22B.

Reference numeral 23 denotes a hinge member serving as a frame support member attached to the flange 13B1 of the pilot valve 13, the hinge member 23 being rotatable between the lock position and the unlocking position, which will describe the stopper frame 22 described later. I support it.

As shown in FIG. 4, the hinge member 23 is comprised by the shaft 23A and the pair of plate member 23B, 23C rotatably connected through the said shaft 23A. An attachment plate 23D bent in an L shape is fixedly attached to the lower end side of one plate member 23B of the hinge member 23, and the attachment plate 23D is a flange 13B1 of the pilot valve 13. Together with the bolt 14 is fastened together to the bottom plate (7). Moreover, 22 A of front frame parts of the stopper frame 22 are fixedly attached to 23 C of other board members of the hinge member 23 by welding.

And the stopper frame 22 of the pedal lock apparatus 21 rotates up and down about the hinge member 23, and the footrest 18 which comprises the pedal 15 as shown in FIG. 3 and FIG. Between the lock position surrounding the pedal surface 18D of the < RTI ID = 0.0 >) < / RTI > It is a moving structure.

When the stopper frame 22 is in the locked position, as shown in Fig. 6, the horizontal frame portion 22B of the stopper frame 22 is moved from the contact surface 18F1 of the footrest 18 that constitutes the pedal 15. It is set to be fixed to a position spaced slightly upward. As a result, when the stopper frame 22 is rotated to the locked position, the stopper frame 22 is configured such that the pedal 15 (footrest 18) is not pressed downward.

Here, when the stopper frame 22 is in the lock position (the position shown in Figs. 3 and 4), the stopper frame 22 moves around the pedal surface 18D of the pedal 15 (footrest 18). Surrounding, the left and right horizontal frame portions 22B are engaged between the projections 18F2 of the engaging portions 18F provided on the left and right sides of the pedal surface 18D (see Fig. 6). In addition, the rear frame part 22C of the stopper frame 22 is disposed behind the pedal face 18D of the footrest 18.

When the stopper frame 22 is in the locked position, as shown by the dashed lines in Figs. 3 and 4, the operator's foot F is formed by the pedal surface 18D of the footrest 18 and the stopper frame 22. As shown in FIG. On the rear frame portion 22C, the stopper frame 22 holds the lock position by the rear frame portion 22C being stepped on the foot F of the operator.

Therefore, for example, when the operator's foot F presses the pedal surface 18D of the footrest 18, even if the pedal 15 intends to rotate in the left and right direction, as shown in FIG. The contact surface 18F1 of the left and right engagement portions 18F is press-fitted from above by the left and right horizontal frame portions 22B of the stopper frame 22. As a result, the inclined rotational movement of the pedal 15 in the left and right directions is restricted, and the pedal 15 is locked (fixed), thereby preventing the pedal 15 from inadvertently operating the operation pedal device 12. can do. As a result, when the stopper frame 22 is moved to the locked position, the stepped operation of the pedal 15 can be reliably prevented by the stopper frame 22, and the pedal 15 can be used as a foot rest. It is.

On the other hand, when the stopper frame 22 is in the unlocking position, the locker of the pedal 15 can be released by separating the stopper frame 22 from the pedal 15 and greatly spaced in front of the pedal 15. have.

In this state, as shown by the dashed-dotted line in Figs. 7 and 8, the operator's foot F is placed on the pedal surface 18D of the footrest 18 to depress the pedal 15, for example, Fig. 9 As indicated by the dashed-dotted line, the pedal 15 is rotated in the horizontal direction to operate the operation pedal device 12 (pilot valve 12).

Reference numeral 24 denotes another operation pedal device located on the front side of the driver's seat 8 and installed on the left side of the front part of the bottom plate 7, and the operation pedal device 24 is a pilot valve similar to the operation pedal device 12 described above. It is comprised as the hydraulic operation pedal apparatus which consists of 13, the pedal 15, etc. (refer FIG. 5). The operation pedal device 24 controls the supply / discharge of the hydraulic oil to external hydraulic equipment (not shown), such as a hand breaker and an auger, by stepping-in operation by the operator seated in the driver's seat 8, for example.

Then, the pedal lock device 21 is provided in the vicinity of the operation pedal device 24, and the depression operation of the operation pedal device 24 can be prohibited by moving the stopper frame 22 to the lock position as described above. By moving the stopper frame 22 to the unlocking position, the operation pedal device 24 can be depressed.

The hydraulic excavator 1 which concerns on this embodiment has the structure as mentioned above, and the operation | movement is demonstrated below.

First, when the work device 4 swings (swings) in the left and right direction and performs excavation work such as side grooves, the operator seated in the driver's seat 8 operates the operation pedal device 12 for the swing cylinder 4H. The stopper frame 22 provided in the vicinity of the operation pedal device 12 is moved to the unlocking position shown in Figs.

Then, in the state where the stopper frame 22 is moved to the unlocked position, the operator places the foot F on the pedal surface 18D of the footrest 18 and presses the pedal 15 to operate. As shown by the dashed-dotted line in 9, the pedal 15 is inclinedly rotated in the left-right direction. Thereby, the expansion-contraction operation of the swing cylinder 4H is controlled according to the depression operation of the pedal 15, and the swing post 4A can be rocked in the left-right direction.

In this way, the operating device 4 is operated by operating the operation lever device 9 or the like and operating the boom 4B, the arm 4C, and the bucket 4D while the whole work device 4 is swung in the left and right direction. Excavation work such as a side groove | channel can be performed using ().

Next, when carrying out the excavation work without swinging the work device 4 in the left-right direction, it is necessary to prevent the operator from inadvertently pushing the pedal 15 of the operation pedal device 12 inadvertently. For this reason, the stopper frame 22 is moved from the unlocking position shown in FIGS. 7-9 to the lock position shown in FIG. 3 and FIG.

As a result, the stopper frame 22 surrounds the circumference of the pedal surface 18D provided on the footrest 18, and the left and right horizontal frame portions 22B of the stopper frame 22 have both the left and right sides of the pedal surface 18D. It is coupled between each projection 18F2 of the engaging portion 18F provided in the. In addition, the rear frame part 22C of the stopper frame 22 is disposed behind the pedal face 18D of the footrest 18. In this state, when the operator's foot F is placed on the pedal surface 18D of the footrest 18, the rear frame portion 22C of the stopper frame 22 is stepped on the operator's foot F to stop the frame. 22 will hold the lock position.

For this reason, for example, even if an operator presses the pedal surface 18D of the footrest 18, the contact surface 18F1 of the left and right of the footrest 18 is set by the left and right horizontal frame part 22B of the stopper frame 22, for example. It can press in from the top. As a result, since the inclined rotation operation of the footrest 18 in the left and right directions is restricted and the pedal 15 is locked, the pedal 15 inadvertently operates the operation pedal device 12 (pilot valve 13). Can be prohibited.

In this case, since the left and right horizontal frame portions 22B of the stopper frame 22 are engaged between the protrusions 18F2 constituting the engaging portion 18F of the footrest 18, the horizontal frame portions of the stopper frame 22 are formed. Slip 22B can be prevented from slipping on the contact surface 18F1 of the footrest 18, and the pedal 15 can be reliably locked by the stopper frame 22. As shown in FIG.

Therefore, when the stopper frame 22 is moved to the locked position, the pedal 15 of the operation pedal device 12 can be used as a foot rest only on which the operator's foot F is placed. In this case, the operator's foot F is placed on the pedal surface 18D of the footrest 18 constituting the pedal 15 in the same manner as when the operation pedal device 12 is operated. The height position of the can be maintained almost constant at all times, and the operator's discomfort when the pedal 15 is used as the foot rest can be suppressed.

Next, when the stopper frame 22 is moved from the lock position back to the unlocked position in order to operate the operation pedal device 12, for example, the operator moves to the rear frame portion 22C of the stopper frame 22. The toe tip is rotated to rotate the stopper frame 22 upward. As a result, the stopper frame 22 can be easily moved to the unlocking position, and the pedal 15 can be quickly pressed in. Thus, the workability of the excavation work using the work device 4 can be improved.

Thus, according to the present embodiment, even when the pedal 15 is pressed in with the stopper frame 22 in the unlocked position, the pedal 15 is used as the foot rest with the stopper frame 22 in the locked position. The operator's foot F can be placed on the pedal surface 18D of the footrest 18 that constitutes the pedal 15. Therefore, the operator seated in the driver's seat 8 can keep the height position of the foot F almost constant all the time, and can suppress the operator's discomfort at the time of the operation of the hydraulic excavator 1.

In addition, since the stopper frame 22 is rotatably supported on the bottom plate 7 via the hinge member 23 in the up and down direction, the operator places the toe or the like on the stopper frame 22 and stops the stopper frame 22. By rotating in the up and down direction, the stopper frame 22 can be easily moved between the locked position and the unlocked position.

In addition, since the stopper frame 22 can be formed by bending one rod member, the number of parts of the entire pedal lock device 21 can be reduced, and the manufacturing cost thereof can be reduced.

Moreover, since the non-slip member 18E is provided in the pedal surface 18D of the footrest 18 which comprises the pedal 15, the pedal surface 18D of the footrest 18 when using the pedal 15 as a foot rest. The slipper member 18E can reliably suppress the slippage of the operator's foot F on the slit.

Moreover, since the projection 18F2 to which the horizontal frame part 22B couples is provided on the contact surface 18F1 of the footrest 18 which the horizontal frame part 22B of the stopper frame 22 which became the lock position contacts, the stopper is provided. The horizontal frame portion 22B of the frame 22 can be prevented from slipping on the contact surface 18F1 of the footrest 18, and the pedal 15 can be reliably locked by the stopper frame 22.

Next, Figs. 10 and 11 show a second embodiment of the present invention, and the feature of the present embodiment is that a pedal holding tool for holding the pedal in an operating state is provided in the bracket constituting the pedal. In addition, in this embodiment, the same code | symbol is attached | subjected to the same component as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

In the figure, reference numeral 31 denotes an operation pedal device used in the present embodiment instead of the operation pedal device 24 according to the above-described first embodiment, and the operation pedal device 31 is external to, for example, a hand breaker and an auger. It is to control the supply and discharge of the hydraulic oil to the hydraulic device (not shown). Here, the operation pedal device 31 is configured as a hydraulic operation pedal device including the pilot valve 13 and the pedal 32 described later, similarly to the operation pedal device 24 according to the first embodiment. The configuration of 32 is different from the pedal 15 according to the first embodiment.

Reference numeral 32 denotes a pedal constituting the operation pedal device 31 together with the pilot valve 13, and the pedal 32 is a bracket (to be described later) attached to the pilot valve 13 as shown in Figs. 33) and the footrest 18 attached to the said bracket 33 is comprised.

Reference numeral 33 is a bracket attached to the pilot valve 13, the bracket 33 is formed in a rectangular plate shape extending in the left and right direction as a whole, for example, using a steel sheet material, and is located in the central portion in the longitudinal direction It is comprised by 33 A of left and right foot mounting parts 33B and 33B located in the both sides of the longitudinal direction across 33 A of flat plates. The right and left bolt insertion holes 33C and 33C are formed in the flat plate portion 33A, and the bracket 33 is formed on the pilot valve 13 by the bolts 17 inserted through the respective bolt insertion holes 33C. It is fixed at. Further, bolt insertion holes 33D are formed in the left and right footrest attachment portions 33B and 33B, respectively, and the footrests on the bracket 33 are formed by bolts 19 inserted through the respective bolt insertion holes 33D. 18) is fixed.

Reference numeral 34 denotes a pedal retainer provided in the bracket 33. The pedal retainer 34 is integrally formed with one of the footrest attachment portions 33B of the bracket 33, for example, and the footrest attachment portion ( It protrudes in the left-right direction from 33B). The protruding end side of the pedal holding tool 34 is a U-shaped hook portion 34A having an upper opening.

Reference numeral 35 denotes a bottom plate side hook located near the operation pedal device 31 and installed on the bottom plate 7, and the bottom plate side hook 35 holds the pedals in the bottom plate 7 as shown in FIG. It attaches detachably using the bolt 36 in the position corresponding to 34 A of hook parts of the support tool 34. FIG.

And the pedal holding | maintenance tool 34 rotates the pedal 32 of the operation pedal device 31 to the left-right direction as shown in FIG. 11, and couples the hook part 34A to the bottom plate side hook 35, The operator holds the pedal 32 of the operation pedal device 31 in a continuous operation state without performing a pedal operation.

The hydraulic excavator according to the present embodiment has the operation pedal device 31 as described above. When the external hydraulic device such as a hand breaker and an auger is operated using the operation pedal device 31, first, the bottom plate is used. The bottom plate side hook 35 is affixed on (7) using the bolt 36.

Then, as shown in Fig. 11, the pedal 32 of the operation pedal device 31 is inclined in the left and right direction to rotate the hook portion 34A of the pedal holding mechanism 34 provided on the bracket 33 on the bottom plate side. By being fixed to the hook 35, the pedal 32 of the operation pedal device 31 can be held in a continuous operation state.

Thereby, for example, the pilot valve 13 of the operation pedal device 31 holds a valve open state, and it is an external hydraulic device (not shown), such as a hand breaker connected to the pilot valve 13. Pressure oil can always be supplied. In this case, operation and stop of an external hydraulic apparatus can be operated by the control valve provided in the external hydraulic apparatus.

Therefore, for example, when there is a hard rock or the like in the ground when the excavation work is performed by the hydraulic excavator 1, the pedal 32 of the operation pedal device 31 is operated using the pedal holding tool 34. By holding in an operation state, the operator who got off from the driver's seat 8, for example, can operate a hand breaker by itself, and can fracture a rock, and can improve the workability of an excavation work.

In addition, in the above-mentioned embodiment, the pedal 15 which comprises the hydraulic operation pedal apparatus 12 is illustrated as a pedal to which the pedal lock apparatus 21 is applied. However, the present invention is not limited thereto, and the present invention can also be applied to the pedal 42 constituting the linkage operation pedal device 41, for example, as shown in the modification shown in FIG.

In this case, as shown in Fig. 12, the link-type operation pedal device 41 is an arm 44 supported by the support plate 43 fixed to the bottom plate 7 so as to be able to swing in the left-right direction, and the arm 44 Pedal 42 fixedly attached to the upper end of the rod, and a rod-shaped link 45 that is rotatably connected to the lower end side of the arm 44 and transmits the operating force of the pedal 42 to a control valve device (not shown). Approximately). The pedal lock device 21 may be provided in the vicinity of the pedal 42 constituting the link operation pedal device 41.

Here, in the link operation pedal device 41, the operation force of the pedal 42 is transmitted to the control valve (not shown) through the arm 44 and the link 45, and thus, similar to the hydraulic operation pedal device 12. The control valve is controlled in accordance with the operation of the pedal 42. When the stopper frame 22 of the pedal lock apparatus 21 is set to the locked position, the pedal 42 can be restrained and the pedal 42 can be used as a foot rest, and the stopper frame 22 is used. When the lock is in the unlocked position, the pedal 42 can be depressed.

In addition, in the above-described first embodiment, the pedal 15 of the operation pedal device 12 is constituted by the bracket 16 attached to the pilot valve 13 and the footrest 18 attached to the bracket 16. The case is illustrated. However, this invention is not limited to this, For example, it is good also as a structure which attaches the footrest 18 directly to the pilot valve 13. As shown in FIG.

In addition, in 2nd Embodiment mentioned above, the case where the pedal holding | maintenance tool 34 is integrally formed in the bracket 33 which comprises the pedal 32 of the operation pedal apparatus 31 is illustrated. However, this invention is not limited to this, For example, you may form the pedal holding tool which consists of a member separate from a bracket, and attach this pedal holding tool to a bracket using a bolt etc.

In addition, in the 2nd Embodiment mentioned above, the case where the bottom plate side hook 35 was attached on the bottom plate 7 in order to hook and fix the hook part 34A of the pedal holding tool 34 is illustrated. However, the present invention is not limited to this, for example, by forming a bolt insertion hole in the pedal holding hole, and screwing the bolt penetrated into the bolt insertion hole to the bottom plate to hold the pedal in an operating state. You may also

According to the invention of claim 1, when the pedal lock device is moved to the locked position, even if the pedal of the operation pedal device is pressed in, the pedal can be locked in contact with the stopper frame to prevent further pedal depression operation. Can be used as a foot rest. On the other hand, when the pedal lock device is moved to the lock release position, the stopper frame is detached from the pedal and the locked state is released, whereby the pedal can be depressed. Since the operator places the foot on the pedal surface of the pedal even when the pedal is depressed, even when the pedal is used as a foot rest, the operator seated in the driver's seat can always keep the height position of the foot almost constant. The discomfort can be suppressed. Further, by rotating the stopper frame supported by the frame supporting member using the toe or the like, the pedal lock device can be easily moved from the locked position to the unlocked position, so that the pedal of the operation pedal device can be quickly pressed in.

Further, according to the invention of claim 2, the number of parts of the pedal lock device can be reduced by forming the stopper frame of the pedal lock device using one bar member, so that the manufacturing cost can be reduced.

Further, according to the invention of claim 3, when the pedal lock device is moved to the lock position, the stopper frame of the pedal lock device engages with the engaging portions provided on both sides of the pedal in the longitudinal direction to lock the pedal. Therefore, the operator can reliably rest on the pedal surface of the pedal which is locked and becomes the foot rest. Further, by coupling the stopper frame to the engaging portion of the pedal, the stopper frame can be prevented from slipping on the surface of the pedal, and the pedal can be reliably locked by the pedal lock device.

In addition, according to the invention of claim 4, since the bracket attached to the pilot valve and the footrest attached to the bracket can be formed using different materials, for example, a resin material or the like, which is difficult to slip the footrest on which the operator rests, is used. By forming in this manner, slipping when the pedal is depressed can be suppressed.

According to the invention of claim 5, the pedal holding tool provided on the bracket can be coupled to, for example, a bottom plate or the like, so that the operation pedal device can be held in the operating state without the operator performing the pedal depression operation.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention.

Fig. 2 is a plan view showing a hydraulic excavator according to the first embodiment.

3 is an enlarged plan view of the operation pedal device and the pedal lock device shown in FIG. 2;

Fig. 4 is a sectional view seen from arrow IV-IV direction in Fig. 3 showing a state where the stopper frame of the pedal lock device is in the locked position;

5 is an exploded perspective view showing a pilot valve and a pedal constituting an operation lever device;

Fig. 6 is a sectional view seen from the arrow VI-VI direction in Fig. 4 showing the operation pedal device and the pedal lock device.

Fig. 7 is a plan view similar to Fig. 3 showing a state where the stopper frame of the pedal lock device is in the unlocking position;

Fig. 8 is a sectional view seen from the arrow VIII-VIII direction in Fig. 7 showing a state where the stopper frame of the pedal lock device is in the unlocking position.

Fig. 9 is a sectional view seen from the arrow IX-IX direction in Fig. 8 showing a state where the stopper frame of the pedal lock device is in the unlocking position.

Fig. 10 is an exploded perspective view similar to Fig. 6 showing a pilot valve, a pedal, and a pedal holding tool of the operation lever device according to the second embodiment;

Fig. 11 is a sectional view similar to Fig. 9 showing a state in which a pedal is held in an operating state by a pedal holding tool.

12 is a sectional view similar to FIG. 9 showing a modification of the operation pedal device; FIG.

<Explanation of symbols for the main parts of the drawings>

2: lower driving member (body)

3: upper pivot member (car body)

4: working device

7: bottom plate

8: driver's seat

12, 24, 31, 41: operation pedal unit

15, 32, 42: Pedal

16, 33: Bracket

18: scaffolding

18D: Pedal Side

18F: Coupling Part

21: Pedal Lock Device

22: stopper frame

22A: front frame part

22B: Horizontal frame section

22C: rear frame part

23: hinge member (frame support member)

34: pedal holding support

34A: Hook part

Claims (5)

An operation pedal device having a self-driving vehicle body provided with a work device, a driver's seat provided on a bottom plate of the vehicle body, a pedal provided at a front side of the driver's seat and a pedal surface provided at an upper surface side thereof, and a pedal of the operation pedal device. A construction machine comprising a pedal lock device that moves between a lock position that prohibits the operation of a lock and a lock release position that permits the operation, The pedal lock device includes a stopper frame formed in a frame shape surrounding the pedal surface of the pedal, and a frame support member rotatably supporting the stopper frame with respect to the bottom plate between the lock position and the unlock position. Construction machine, characterized in that configured by. The construction machine according to claim 1, wherein the stopper frame is formed as a frame corresponding to the pedal shape by bending one bar member. 3. The pedal according to claim 1 or 2, wherein the pedal face is located at the center portion in the longitudinal direction, and the pedal face is positioned at both sides in the longitudinal direction with the pedal surface interposed therebetween so that the pedal lock device is in the lock position. The construction machine which consists of a structure which installs the coupling part which a stopper frame engages. 4. The pedal according to any one of claims 1, 2, or 3, wherein the pedal is attached to a pilot valve generating a pilot pressure, and the pedal surface is superimposed on an upper side of the bracket and the pedal surface is provided on an upper surface thereof. Construction machinery consisting of scaffolding. The construction machine according to claim 4, wherein the bracket of the pedal is provided with a pedal holding tool for holding the pedal in an operating state.