Operation pedal device of work machine

Abstract

To provide an operation pedal device of a work machine that has a simple configuration, prohibits pedal operation when a pedal is not operated, and can easily change to a posture that allows pedal operation in a narrow space.SOLUTION: An operation pedal device 50 comprises a pedal portion 60 that is provided rotatably in a forward / rearward direction. The pedal portion 60 has: a pedal body 61 that rotates around a rotation axis; and an extension pedal 66 that is attached so that a posture can be changed between a first posture in which it is pulled out rearward of the pedal body 61 relative to the pedal body 61 to allow rotation of the pedal body 61 and a second posture in which a front end 69b abuts against an installation surface of the operation pedal device 50 in front of the pedal body 61 to restrict rotation of the pedal body 61.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an operation pedal device that is provided on a floor portion in front of a driver's seat of a work machine for operating a work device attached to the work machine. [Background technology]

[0002] Conventionally, a working machine such as an excavation machine is provided with a driver's seat, and in addition to a travel lever for driving the working machine, an operating pedal device for operating a working device such as an excavation device is arranged on the floor in front of the driver's seat.

[0003] For example, Patent Document 1 discloses a configuration for an excavation machine, in which an operating pedal device is located in front of the driver's seat and is equipped with a pedal locking device that moves between a locked position that prohibits operation of the pedal and an unlocked position that allows operation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-097938 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration disclosed in Patent Document 1, the pedal lock device has a stopper frame rotatably supported on a floor plate by a hinge member whose rotation axis is in the left-right direction. This rectangular frame, the stopper frame, is configured to rotate between a locked position in which it surrounds the pedal's foot tread and an unlocked position in which it is in an upright position forward of the pedal's foot tread by the hinge member. Therefore, when an operator drives a work machine such as an excavator in the forward-backward direction without placing his / her foot on the pedal's foot tread, the stopper frame falls back to the locked position due to the forward-backward swaying of the machine body. In other words, a problem occurs in which the pedal operation is prohibited regardless of the operator's intention when the pedal operation is required.

[0006] In addition, because the pedal's tread surface must be contained within the stopper frame, the stopper frame must also be made larger to expand the area of ​​the tread surface. This increases the size of the pedal device, including the pedal lock device, and can impair the freedom of arrangement and size of other pedals and the operability.

[0007] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide an operating pedal device for a work machine that has a simple configuration, prohibits pedal operation when the pedal is not being operated, and can easily be changed to a posture that allows pedal operation in a narrow space. [Means for solving the problem]

[0008] The operating pedal device for a work machine according to the present invention is an operating pedal device for a work machine comprising a pedal body supported so as to be swingable in the forward / backward direction, and an extension pedal attached to the pedal body, wherein the extension pedal is attached so as to be able to change its position between a first position in which it is pulled out rearward of the pedal body to allow rotation of the pedal body, and a second position in which its front end abuts against a mounting surface of the operating pedal device in front of the pedal body to restrict the rotation of the pedal body, and when in the second position, the extension pedal restricts the forward rotation of the pedal body by a first regulating portion that constitutes the underside of the extension pedal, and a second regulating portion that is forward of the first regulating portion and constitutes the upper surface of the extension pedal.

[0009] In another aspect of the present invention, in the operating pedal device of a work machine, the extension pedal has a pair of left and right extension portions extending in the front-to-rear direction and arranged parallel to each other, and the extension portions are accommodated toward the front of the pedal body when the extension pedal changes position from the first position to the second position.

[0010] Another aspect of the present invention relates to an operating pedal device for a work machine, in which the second regulating portion is provided on the extended portion and the first regulating portion is provided rearward of the extended portion.

[0011] Another aspect of the present invention provides an operating pedal device for a work machine, in which the pedal body is provided with a guide portion that guides the movement of the extension portion when the extension pedal changes position between the first position and the second position.

[0012] Another aspect of the present invention provides an operating pedal device for a work machine, wherein the pedal body has a step portion whose upper surface forms a foot tread surface, and the guide portions are provided in a pair on the left and right sides of the rear side of the step portion, penetrating the step portion, and the extension portions are loosely inserted into each of the left and right guide portions.

[0013] Another aspect of the present invention provides an operating pedal device for a work machine, wherein the first regulating portion abuts against the foot tread surface rearward of the guide portion when the extension pedal is in the second position.

[0014] Another aspect of the present invention provides an operating pedal device for a work machine, in which the pedal body has an abutment portion that abuts against the second regulating portion when the extension pedal is in the second position.

[0015] A working machine operation pedal device according to another aspect of the present invention is a working machine operation pedal device, wherein the abutment portion is provided forward and below the guide portion.

[0016] In another aspect of the present invention, in the operating pedal device for a work machine, the extension portion is arranged to extend rearward behind the guide portion and above the foot tread surface when in the first posture.

[0017] Another aspect of the present invention provides an operating pedal device for a work machine, in which an anti-slip portion is provided in front of the extension portion, which engages with the guide portion to prevent the front end of the extension pedal from slipping out.

[0018] Another aspect of the present invention provides an operating pedal device for a work machine, in which the first regulating portion is the underside of a rear frame portion that protrudes rearward and is inclined at a predetermined angle relative to the extension direction of the extension portion when viewed from the side. Effect of the Invention

[0019] According to the present invention, the operating pedal device of a work machine can be configured compactly, pedal operation can be prohibited when the pedal is not being operated, and the position can be easily changed to one that allows pedal operation in a narrow space. [Brief description of the drawings]

[0020] [Figure 1] 1 is a left side view of an excavation machine to which an operation pedal device according to an embodiment of the present invention is applied. [Diagram 2] 3 is a plan view of a floor portion illustrating the arrangement of an operation pedal device according to an embodiment of the present invention. FIG. [Diagram 3] 1 is a block diagram showing an example of the configuration of a hydraulic system related to the operation of an excavation machine through operation of an operation pedal device according to an embodiment of the present invention; [Figure 4] 1 is a perspective view of an operation pedal device according to an embodiment of the present invention, viewed from the upper left. [Diagram 5] 1 is a perspective view of an operation pedal device according to an embodiment of the present invention, viewed from the upper left. [Figure 6] 1 is a left side view of an operation pedal device according to an embodiment of the present invention. [Figure 7] 1 is a left side view of an operation pedal device according to an embodiment of the present invention. [Figure 8] 10A to 10C are diagrams illustrating a state in which an extension pedal is removed from a pedal body in an operating pedal device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The present invention relates to an operating pedal device that is disposed, for example, on the floor in front of the driver's seat of a work machine and that is operated by an operator with his / her foot when operating the work device, and by devising the configuration of an extension pedal that is connected to the pedal body and the manner in which it is connected to the pedal body, the present invention provides an operating pedal device with a compact configuration while improving the operability of the pedal. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] In the embodiment of the present invention, the pedal device for a work machine according to the present invention will be described by taking as an example a case where it is applied to an excavation work machine (shovel) which is a slewing work vehicle. However, the pedal device for a work machine according to the present invention is not limited to excavation work machines, and can be widely applied to other work machines such as bulldozers, crane work machines, compact track loaders, skid steer loaders, wheel loaders, or tractors, combine harvesters, etc.

[0023] The overall configuration of an excavation machine 1 according to this embodiment will be described with reference to Fig. 1. In the following, unless a particular viewing direction is specified, the following will be referred to as the "front side", "rear side", "left and right sides", "flat side" or "upper side", "bottom side" or "lower side" based on the position of an operator seated in the driver's seat of the excavation machine 1.

[0024] As shown in FIG. 1, the excavation machine 1 is a relatively small so-called shovel, and includes a self-propelled traveling body 2, and an excavation device 3 and an earth removal device 4 as working devices attached to the traveling body 2.

[0025] The excavator 1 has a pair of left and right crawler-type traveling sections 5, 5, a track frame 6 serving as a base supporting the left and right traveling sections 5, 5, and a revolving frame 7 provided on the track frame 6.

[0026] The left and right running parts 5, 5 are driven by a pair of left and right running hydraulic motors 44, 44. The running hydraulic motor 44 is a hydraulic actuator that is driven by the supply of hydraulic oil. The running part 5 has a configuration in which a track is wound around a rotating body such as a plurality of sprockets supported on a predetermined frame portion that constitutes the track frame 6. The running part 5 has a drive sprocket 5a as a rotating body at its rear end. The track frame 6 has a center frame portion 6a located between the left and right running parts 5, 5, and side frame portions 6b provided on both the left and right sides of the center frame portion 6a.

[0027] The soil removal device 4 is attached to the front side of the truck frame 6. The soil removal device 4 has a pair of support frames 4b extending in the front-rear direction between the left and right running parts 5, 5, and a blade 4a as a blade plate provided at the tip side of the support frames 4b. The soil removal device 4 is provided so as to be able to rise and fall and rotate by a blade cylinder (not shown) provided between the support frames 4b and the truck frame 6.

[0028] The revolving frame 7 is configured to be substantially circular in plan view, and is provided to the track frame 6 so as to be revolvable in either the left or right direction about a vertical axis by means of a revolving bearing 6c provided on the upper side of the track frame 6. A counterweight 7a is provided on the rear lower part of the revolving frame 7. The revolving frame 7 is also configured so as to be revolvable within the left-right width of the left and right running parts 5, 5, that is, within the width between the left outer edge of the left running part 5 and the right edge of the right running part 5. This enables the excavation machine 1 to perform small turning operations.

[0029] A driving section 10 is provided on the rotating frame 7. A tank section 9 is provided to the right of the driving section 10. The tank section 9 is provided with a hydraulic oil tank 9a (see FIG. 3) that stores hydraulic oil to be supplied to hydraulic actuators such as hydraulic cylinders of the excavation machine 1. The left side of the floor section 8 of the driving section 10 serves as an entrance for an operator to get on and off the driving section 10. In addition, an engine 12, which is a prime mover, is provided at the rear of the rotating frame 7 as a drive source. The rear and right side of the rotating frame 7 are covered by a bonnet and an exterior cover.

[0030] The driving unit 10 is a section on which an operator rides to drive and operate the excavation device 3 and the traveling unit 5. A canopy 13 is provided for the driving unit 10 on the rotating frame 7. The canopy 13 has a pair of left and right support columns 36, 36 erected above the rear of the rotating frame 7, and a canopy roof section 38 supported by the support columns 36, 36 and protruding forward. The canopy roof section 38 covers the driving unit 10 from above.

[0031] In the driver's unit 10, a driver's seat support base 14 is provided behind the floor 8, and a driver's seat 15 is provided on the driver's seat support base 14. A pair of left and right travel levers 16 are provided in front of the driver's seat 15, extending upward from the floor 8. A plurality of operation pedals for work are disposed on both the left and right sides of the travel levers 16 on the floor 8. In the driver's unit 10, an operation panel unit having various operation units such as work operation levers 17 and switches for operating working units such as the excavator 3 is provided around the driver's seat 15.

[0032] The excavation device 3 is a front working device provided at the front of the excavation work machine 1. A support bracket 18 for supporting the excavation device 3 is provided protruding forward from the left-right central portion of the front end of the revolving frame 7. A boom support bracket 19 forming the base end of the excavation device 3 is supported by the support bracket 18 so as to be rotatable with the vertical direction as the rotation axis direction. The excavation device 3 is provided so as to swing left and right relative to the revolving frame 7 by a swing hydraulic cylinder (not shown) provided between the boom support bracket 19 and the revolving frame 7.

[0033] The excavation device 3 has a boom 21 that is bent like a boomerang in side view and that constitutes the base side of the excavation device 3, an arm 22 connected to the tip of the boom 21, and a bucket 23 attached to the tip of the arm 22. The excavation device 3 has a boom cylinder 26 that rotates the boom 21, an arm cylinder 27 that rotates the arm 22, and a work tool cylinder 28 that rotates the bucket 23. All of these cylinders are hydraulic cylinders. In the excavation device 3, other devices such as a grapple or a breaker are attached instead of the bucket 23 depending on the work to be performed.

[0034] In the excavation machine 1 having the above-described configuration, the operator seated in the driver's seat 15 appropriately operates the travel lever 16, the work operation lever 17 and the operation pedals to perform the desired operation and work.

[0035] The arrangement of operation pedals on floor portion 8 in front of driver's seat 15 in driver's section 10 will be described with reference to FIG.

[0036] The floor section 8 is configured to include a front step section 8a on which a plurality of operation pedals operated by the operator with their feet are attached, and a rear step section 8b connected to the rear of the front step section 8a. A swing pedal 41, a travel pedal 42, and an operation pedal device 50 according to this embodiment are arranged in this order from right to left on the front step section 8a.

[0037] The travel pedals 42 are provided below a pair of left and right travel levers 16 that are provided so as to protrude upward in the center of the front step portion 8a in front of the driver's seat 15. The pair of left and right travel pedals 42 and the pair of left and right travel levers 16 are operated to make the excavator 1 travel straight forward and backward and turn left and right. The travel pedals 42 and the travel levers 16 are configured so that their movements are linked to each other.

[0038] A swing pedal 41 is disposed on the right side of the traveling pedal 42. The swing pedal 41 is an operation pedal that corresponds to the operation of a swing cylinder 29 (see FIG. 3) that swings the boom support bracket 19 that supports the base end of the boom 21 of the excavation device 3 left and right.

[0039] An operating pedal device 50 is disposed to the left of the traveling pedal 42. The pedal disposed to the left of the traveling pedal 42 is also referred to as a PTO pedal. The PTO pedal is an operating pedal for an attachment when, instead of the bucket 23, an additional work device (attachment) such as a grapple for clamping construction materials or a breaker for breaking up concrete by vibration is attached. The operation of the excavation machine 1 by operating the PTO pedal will be described with reference to FIG. 3. FIG. 3 shows an overview of an example of the configuration of a hydraulic system related to the operation of the excavation machine 1 by operating the PTO pedal. Also, in FIG. 3, a pilot line to the operating pedal device 50 is indicated by a dashed line, and a hydraulic actuator 43 of the attachment and its pressure oil supply and discharge line are indicated by a two-dot chain line.

[0040] The excavator 1 includes, as its hydraulic system, a main pump 46 and a pilot pump 47 mechanically connected to the engine 12, and a control valve unit 48. The control valve unit 48 is configured to include a plurality of control valves (directional control valves) that control the supply and discharge of hydraulic oil to a plurality of hydraulic actuators. This control valve unit 48 is provided with a PTO service port 49. When, for example, an attachment added to the standard specifications of the excavator is operated by the operation of a hydraulic actuator, the PTO service port 49 is a port to which a supply and discharge pipe for supplying and discharging hydraulic oil to the hydraulic actuator 43 of the attachment is connected. In other words, the PTO pedal is an operation pedal for a hydraulic actuator connected to the PTO service port.

[0041] The operation pedal device 50 functioning as such a PTO pedal has a generally rectangular shape that is long in the front-to-rear direction as a whole in a plan view as shown in Fig. 2, and is configured to be able to swing up and down when operated with the operator's foot. The operation pedal device 50 is disposed at a position diagonally forward and left as seen from the operator on the floor 8, with the tip side tilted slightly outward at a predetermined angle (e.g., 5 to 15 degrees) with respect to the front-to-rear direction, from the viewpoint of convenience of operation with the operator's left foot.

[0042] A detailed configuration of the operation pedal device 50 will be described with reference to Fig. 4 to Fig. 8. Fig. 4 and Fig. 6 show a state in which the operation pedal device 50 allows operation by the operator, and Fig. 5 and Fig. 7 show a state in which the operation pedal device 50 is restricted from being operated by the operator. Fig. 8 shows a state in which the extension pedal 66 is being removed from the pedal body 61 in the operation pedal device 50. In Fig. 8, the casing 51a of the pilot valve 51 is not shown.

[0043] The operation pedal device 50 is a hydraulic pedal device equipped with a pilot valve 51 as an operation conversion section that converts the amount of pedal operation into a drive signal for the working device and outputs the signal. The operation pedal device 50 is equipped with a pedal section 60 that is provided so as to be swingable in the front-rear direction relative to the pilot valve 51.

[0044] The operation pedal device 50 is fixed to a fixing plate portion 52 for fixing the pilot valve 51 and attaching the operation pedal device 50 to the floor portion 8. The fixing plate portion 52 is provided with a rectangular hole portion through which the rectangular parallelepiped casing 51a of the pilot valve 51 can be inserted, and the casing 51a is fitted into the hole portion. The pilot valve 51 is integrated with the fixing plate portion 52 by fixing a flange portion 51b provided at the upper end of the pilot valve 51 to the fixing plate portion 52 with a bolt and a nut. The fixing plate portion 52 is provided with a plurality of holes 57 (for example, four holes) into which bolts for fixing to the floor portion 8 are inserted. The fixing plate portion 52 has a substantially square shape (see FIG. 2), but may have various shapes, such as a cutout in part to avoid interference with other members provided to protrude from the floor plate constituting the floor portion 8, or an extended portion to provide a hole portion 57 that allows the fixing to an underfloor frame member supporting the floor plate from below by screw fastening. The pilot valve 51 is disposed under the floor by attaching the fixing plate portion 52 to a predetermined position of the front step portion 8a by screw fastening or the like. Note that the fixing plate portion 52 may be omitted and the flange portion 51b of the pilot valve 51 may be directly fixed to the floor portion 8.

[0045] A pedal operation transmission mechanism that transmits the amount of operation of the pedal unit 60 to the pilot valve 51 is provided above the flange unit 51b, which is above the fixed plate unit 52. The pedal operation transmission mechanism includes a rotating shaft 55 (see Figs. 6 and 7) that rotates the pedal unit 60 about its axial direction in the substantially left-right direction. These components are covered by a bellows-shaped boot 54 made of an elastic material such as rubber for dust and water protection.

[0046] The pedal section 60 has a pedal body 61 that is operated to swing back and forth, and an extension pedal 66 that is provided so as to be able to be pulled out rearward from a rear position of the pedal body 61.

[0047] The pedal body 61 has a step portion 62, the upper surface of which becomes a stepping surface 62a, and a support portion 63 that supports the step portion 62 from below.

[0048] The step portion 62 has a generally rectangular shape that is long in the front-rear direction, and is provided with a pair of guide portions 62b, 62b that guide the sliding movement of an extension pedal 66, which will be described later. The guide portions 62b are recessed portions that are cut out at the left and right edges of the rear side of the step portion 62.

[0049] Further, a hole 62c is formed in the step plate portion 62. The hole 62c serves as an opening for assembly to ensure space for operating a bolt that fixes the pedal body 61 to the pedal operation transmission mechanism side inside the boot 54. It also functions as a mud remover that removes dirt adhering to the soles of the operator's shoes below the step plate portion 62.

[0050] The support portion 63 is formed by bending a metal plate, and has a generally trapezoidal shape in which the front and rear opposing sides are parallel in a side view. The support portion 63 is formed to include a horizontal plate portion 63a connected to the upper end of the boot 54 by screw fastening, a front upright plate portion 63b rising vertically from the front end of the horizontal plate portion 63a, and a rear upright plate portion 63c rising vertically from the rear end of the horizontal plate portion 63a. The rear upright plate portion 63c has a length of about one-half to one-third of the vertical length of the front upright plate portion 63b.

[0051] The horizontal plate portion 63a is a plate body having an approximately T-shaped shape in a plan view. The head portion of the approximately T shape of the horizontal plate portion 63a is a pair of abutting portions 63d, 63d that abut against a first restricting portion 68d of the extension pedal 66 described later. In other words, the pair of abutting portions 63d, 63d are portions of the horizontal plate portion 63a that extend horizontally from the left and right edges of the horizontal plate portion 63a at a front position close to the connection end with the front standing plate portion 63b. The foot portion of the approximately T shape of the horizontal plate portion 63a is formed narrower than the width of the foot plate portion 62, and allows the extension portion 67 of the extension pedal 66 described later to move on both sides of the horizontal plate portion 63a.

[0052] The front standing plate portion 63b and the rear standing plate portion 63c are connected to the step plate portion 62 of the pedal body 61 at their respective upper ends. More specifically, the step plate portion 62 is fixed at its front end to the upper end of the front standing plate portion 63b and its rear end to the upper end of the rear standing plate portion 63c by welding or the like. By making the vertical length of the rear standing plate portion 63c shorter than that of the front standing plate portion 63b, the step plate portion 62 installed on the front standing plate portion 63b and the rear standing plate portion 63c is supported by the support portion 63 in a state of inclination with the front high and the rear low. The inclination angle of the step plate portion 62 is about 20 degrees to 30 degrees, and a desired inclination angle is realized by the difference in height between the front standing plate portion 63b and the rear standing plate portion 63c. In addition, in the support portion 63, the rear upright plate portion 63c may be omitted depending on the size of the pedal operation transmission mechanism covered by the boot 54 and / or the desired inclination angle.

[0053] The pedal body 61 is connected to the upper end of the boot 54 via the horizontal plate portion 63a of the support portion 63 so that the pedal operation and the rotation of the rotation shaft 55 in the boot 54 are linked. That is, the pedal body 61 is connected to the rotation shaft 55 constituting the pedal operation transmission mechanism in the boot 54 via the support portion 63, and is configured to be rotatable around the rotation shaft 55 whose axis is in the left-right direction. Also, as shown in Figs. 6 and 7, the pedal body 61 forms a frame that is open in the left-right direction by the stepping plate portion 62 and the support portion 63. This allows soil, etc., that falls from the hole portion 62c of the stepping plate portion 62 to be easily discharged onto the floor portion 8 on the left and right sides of the operating pedal device 50, and prevents soil, etc., from accumulating on the tread surface of the stepping plate portion 62.

[0054] The extension pedal 66 is formed into a rectangular frame shape that is long in the front-to-rear direction in a plan view by bending a single bar material such as a round steel material (see FIG. 2). The extension pedal 66 has a pair of left and right extension parts 67, 67 that extend in the front-to-rear direction, a rear frame part 68 provided behind the pair of left and right extension parts 67, 67, and a slip-out prevention part 69 provided in front of the pair of left and right extension parts 67, 67.

[0055] The rear frame portion 68 is a generally U-shaped portion provided in the extension pedal 66 so as to protrude diagonally downward and rearward from the rear ends of a pair of left and right linear extension portions 67, 67 that are parallel to each other. The rear frame portion 68 has a pair of left and right inclined portions 68a, 68a provided at an angle with respect to the extension direction of the extension portion 67, and a connecting portion 68b that connects the rear ends of the pair of left and right inclined portions 68a, 68a to each other.

[0056] The inclined portion 68a is inclined at a predetermined angle (for example, 100 to 130 degrees) in a side view with respect to the extending direction of the pair of left and right extension portions 67, 67. That is, between the left and right extension portions 67, 67 that are linear and extend parallel to each other and the left and right inclined portions 68a, 68a, there are bent portions 68c, 68c. As shown in FIG. 7, in the extension pedal 66, the lower surface side of the inclined portion 68a at the rear of the extension portion 67 becomes the first restricting portion 68d that restricts the forward rotation of the pedal body 61 when the extension pedal 66 is in the second position that restricts the rotation of the pedal body 61. That is, the lower surface side of the rear frame portion 68 becomes the portion that constitutes the first restricting portion 68d that restricts the forward rotation of the pedal body 61 when the extension pedal 66 is in the second position. Of the rear frame portion 68, the inner portion of the obtuse-angled bend formed by the extension portion 67 and the rear frame portion 68 in a side view becomes the first restricting portion 68d. In the extension pedal 66 formed of a round bar-shaped member, the first restricting portion 68d becomes the lower end portion that comes into line contact with the foot tread surface 62a along the extension direction of the rear frame portion 68 when the extension pedal 66 is in the second position.

[0057] The connecting portion 68b has a length direction perpendicular to the extension direction of the extension portion 67 in a plan view, and connects the rear ends of the pair of left and right inclined portions 68a, 68a connected to the rear of the extension pedal 66. That is, the connecting portion 68b is a portion that connects the pair of left and right extension portions 67, 67 to each other via the inclined portions 68a, 68a. Therefore, by making the length of the connecting portion 68b equal to the width in the left-right direction of the step portion 62 of the pedal main body 61, the pair of left and right extension portions 67, 67 are provided at a distance equal to the width of the step portion 62 from the pedal main body 61. Note that, when the extension pedal 66 is in the second position, the connecting portion 68b is disposed so as to protrude rearward from the step portion 62 of the pedal main body 61. That is, the connecting portion 68b becomes a gripping portion that the operator grips when changing the extension pedal 66 from the second position to the first position. In addition, when the extension pedal 66 is operated by the operator's foot F to change the position, the connecting portion 68b serves as a locking portion for hooking the foot F onto the extension pedal 66.

[0058] The pair of left and right extension portions 67, 67 are inserted into recessed guide portions 62b, 62b formed on the left and right sides of the footboard portion 62 so as to be slidable in the front-rear direction, respectively. The position of the extension pedal 66 can be changed between the first position and the second position by the operator gripping the connecting portion 68b and pulling it out from and storing it back into the pedal body 61.

[0059] A retaining portion 69 is provided in front of each of the pair of left and right extension portions 67, 67, which prevents the extension pedal 66 from slipping off from the step portion 62 of the pedal body 61 when the extension pedal 66 is pulled out rearward from the pedal body 61, i.e., when the pedal body 61 is in a first position that allows rotation. The retaining portion 69 includes a stepped bent portion 69a that is substantially S-shaped in side view at a connecting portion with the front end of each of the pair of left and right extension portions 67, 67. The stepped bent portion 69a is a portion that fits into the guide portion 62b of the step portion 62 when the extension pedal 66 is in the first position. The stepped bent portion 69a is formed by bending a portion extended forward from the extension portion 67 downward at an obtuse angle, and further bending the portion in the opposite direction continuously forward from the portion.

[0060] The extension pedal 66 has a generally inverted bathtub shape in side view (see Figs. 6 and 7) with a rear frame portion 68 connected to the rear ends of the left and right extension portions 67, 67 and a retaining portion 69 connected to the front ends of the left and right extension portions 67, 67. When the extension pedal 66 changes position between the first position and the second position, the linear extension portion 67 between the bent portion 67a and the stepped bent portion 69a is guided in movement by a guide portion 62b formed on the tread portion 62 of the pedal body 61.

[0061] The extension pedal 66 is provided with the anti-slip portion 69, which prevents the extension pedal 66 from slipping out of the guide portion 62b provided on the tread portion 62 of the pedal body 61 when the extension pedal 66 is in the first position, as shown in Fig. 6. When the extension pedal 66 is pulled out rearward of the pedal body 61, the extension portion 67 of the extension pedal 66 is slightly spaced rearward of the guide portion 62b of the pedal body 61 from the foot tread surface 62a. In other words, there is a gap between the front edge of the guide portion 62b and the extension portion 67 located rearward of it.

[0062] When the extension pedal 66 is in the first position, the stepped bent portion 69a of the retaining portion 69 is fitted into the guide portion 62b. In this state, the stepped bent portion 69a intersects with the step portion 62 of the pedal body 61 in a substantially X-shape in side view, as shown in FIG. 6. In such a first position, a force that rotates the extension pedal 66 downward about the stepped bent portion 69a due to its own weight acts on the portion of the extension pedal 66 rearward of the stepped bent portion 69a. Therefore, an upward force acts on the portion of the extension pedal 66 forward of the stepped bent portion 69a. As a result, the front upper portion of the stepped bent portion 69a abuts tightly against the front lower corner of the concave guide portion 62b, and the rear lower portion of the stepped bent portion 69a abuts tightly against the rear upper corner of the concave guide portion 62b. Therefore, the extension pedal 66 is supported by the step portion 62 with the front end portion 69b in a retained state.

[0063] By drawing out the extension pedal 66 rearward, the area where the operator can step on the pedal is expanded, improving the operability of the operation pedal device 50. In addition, the extension pedal 66 is formed into a frame shape by bending a single round bar material, so that mud on the soles of the operator's shoes does not accumulate above the extension pedal 66.

[0064] Furthermore, when the operator places his / her foot F on the pedal portion 60 and rotates it around the rotation shaft 55 in either direction, a force (indicated by white arrow Q in FIG. 6) acts on the extension pedal 66 to rotate it downward around the stepped bent portion 69a as a fulcrum. Then, the stepped bent portion 69a is tightly fitted to the front and rear ends of the guide portion 62b, and the extension pedal 66 is fixed to the foot plate portion 62. Therefore, when the operator operates the operation pedal device 50 with the extension pedal 66 in the first position, the extension pedal 66 rotates around the rotation shaft 55 together with the pedal body 61. Depending on the shape and dimensions of the guide portion 62b of the foot plate portion 62 and the retaining portion 69 of the extension pedal 66, the extension pedal 66 may be configured so that the front end portion 69b comes into contact with the rear surface (lower surface) of the foot plate portion 62.

[0065] When the operator operates the pedal section 60 in either the forward or backward direction with the extension pedal 66 in the first position, the pilot valve 51 is actuated via a pedal operation transmission mechanism in the boot 54. This causes the hydraulic actuator 43 (see FIG. 3) to operate, and an auxiliary work device such as a grapple attached in place of the bucket 23, for example, is operated.

[0066] 7, when the extension pedal 66 is in the second position that restricts the rotation of the pedal body 61, the upper surface of the extension portion 67 at a position close to the stepped bent portion 69a becomes the second restricting portion 67b that abuts against the abutment portion 63d of the support portion 63 of the pedal body 61. In the extension pedal 66 formed of a round bar-shaped member, the second restricting portion 67b becomes the upper end portion of the extension portion 67 that makes point contact with the abutment portion 63d when the extension pedal 66 is in the second position.

[0067] When the extension pedal 66 is in the second position, the pair of left and right extension parts 67, 67 are inclined with a front-low and rear-high inclination, and the front end part 69b of the extension pedal 66 abuts against the fixed plate part 52. At this time, the inclination angle of the extension part 67 of the extension pedal 66 with respect to the upper surface of the fixed plate part 52 is, for example, about 25 to 35 degrees. In addition, in the second position, the extension pedal 66 is housed in the pedal body 61 so that the front end to the rear end of the extension pedal 66 is within at least the range of the front-rear direction length of the flange part 51b of the pilot valve 51.

[0068] In this manner, when the extension pedal 66 is housed in the pedal body 61, the rear frame portion 68 is positioned on the foot tread surface 62a of the foot plate portion 62 of the pedal body 61. At this time, there is a slight gap between the foot tread surface 62a and the underside of the rear frame portion 68.

[0069] When the extension pedal 66 is in the second position, if the operator places his / her foot F on the pedal portion 60 and steps forward, a load (indicated by a white arrow R in FIG. 7) is applied to the pedal body 61 and the extension pedal 66 in a diagonal direction, for example, from rear to front. In addition, in the pedal body 61 that receives the load, a force that rotates the footboard portion 62 and the support portion 63 forward acts. On the other hand, in the extension pedal 66 that receives the load, a force that presses the footboard portion 62 against the rear frame portion 68 acts, and a force that rotates the front end portion 69b of the extension pedal 66 upward with the bent portion 68c as a fulcrum acts. In response to this, the rear end of the pedal body 61 abuts against the upper surfaces of the extension portions 67, 67 of the extension pedal 66 at the abutment portion 63d provided on the support portion 63, thereby countering the force that rotates the front end portion 69b upward. In other words, the rotation of the pedal body 61 and the extension pedal 66 is restricted by the second restricting portion 67b on the upper surface of the extension portions 67, 67 of the extension pedal 66. Therefore, the load applied to the pedal portion 60 by the operator's foot F is directed to the fixed plate portion 52 (floor portion 8), the foot plate portion 62, and the abutment portion 63d via the pair of left and right extension portions 67, 67, and does not act on the rotation shaft 55 in the boot 54. In this way, the forward rotation of the pedal body 61 is restricted by the first restricting portion 68d and the second restricting portion 67b.

[0070] Furthermore, when the operator places his / her foot F on the pedal portion 60 and steps backward when the extension pedal 66 is in the second position, the load (indicated by the white arrow S in FIG. 7) applied to the pedal portion 60 by the operator's foot F is directed toward the floor portion 8 via the pair of left and right extension portions 67, 67 arranged diagonally with respect to the pedal body 61, and does not act on the rotation shaft 55 in the boot 54. In other words, by storing the extension pedal 66 in the pedal body 61 with the front end portion 69b abutting against the fixed plate portion 52 (floor portion 8), the pair of left and right extension portions 67, 67 arranged diagonally with respect to the pedal body 61 and the retaining portions 69, 69 extended from their front ends function like a stopper rod, and as a result, the rotation of the pedal body 61 backward is restricted.

[0071] In order to make the extension pedal 66 detachable from the pedal body 61, the width of the concave guide portion 62b in the front-rear direction is about 1.5 times longer than the diameter of the round bar material from which the extension pedal 66 is formed. In other words, a gap is provided between the extension pedal 66 and the guide portion 62b so that the retaining portion 69 can be inserted and removed. Since the extension portion 67 of the extension pedal 66 is loosely inserted into the guide portion 62b of the pedal body 61, when removing the extension pedal 66 from the pedal body 61, the extension pedal 66 is pulled up diagonally upward with the rear frame portion 68 facing upward as shown in FIG. 8. Thereafter, the extension pedal 66 is further moved upward while being rocked back and forth along the S-shape of the stepped bent portion 69a at the position of the stepped bent portion 69a, so that the front end portion 69b of the extension pedal 66 can be removed above the guide portion 62b.

[0072] In this embodiment, the extension pedal 66 formed of a round bar-shaped member has a first restricting portion 68d facing downward on its outer circumferential surface in line contact with the foot tread surface 62a and a second restricting portion 67b facing upward on its outer circumferential surface in point contact with the abutment portion 63d, thereby restricting the forward rotation of the pedal body 61. In this way, the extension pedal 66 is shaped so that, when in the second position in which the rotation of the pedal body 61 is restricted, predetermined portions of the outer circumferential surface of the round bar-shaped member (the first restricting portion 68d, the second restricting portion 67b) can make line or point contact with the pedal body 61, thereby making it possible to prohibit pedal operation when the pedal is not being operated, despite the simple configuration.

[0073] It can be said that the excavation machine 1 to which the operation pedal device 50 according to this embodiment having the above-mentioned configuration is applied has the following configuration. That is, the excavation machine 1 is provided with the operation pedal device 50 on the floor part 8 in front of the driver's seat 15 of the excavation machine 1 in order to operate the working device (excavation device 3) attached to the excavation machine 1.

[0074] It can be said that the operation pedal device 50 according to this embodiment has the following configuration: That is, the operation pedal device 50 is an operation pedal device 50 for a work machine (excavation work machine 1) that includes a pedal main body 61 supported so as to be swingable in the front-rear direction, a pedal main body 61 supported so as to be rotatable in the front-rear direction, and an extension pedal 66 attached to the pedal main body 61, the extension pedal 66 is attached so as to be able to change its position between a first position in which the extension pedal 66 is pulled out rearward relative to the pedal main body 61 to allow rotation of the pedal main body 61, and a second position in which the front end portion 69b abuts against the installation surface (floor portion 8, fixed plate portion 52) of the operation pedal device 50 in front of the pedal main body 61 to restrict rotation of the pedal main body 61, and when in the second position, the extension pedal 66 restricts the forward rotation of the pedal main body 61 by a first restricting portion 68d that constitutes the lower surface of the extension pedal 66 and a second restricting portion 67b that is forward of the first restricting portion 68d and constitutes the upper surface of the extension pedal 66.

[0075] According to the operation pedal device 50 having the above-mentioned configuration, when the pedal body 61 is in the second position in which the rotation of the pedal body 61 is restricted, the front end portion 69b of the extension pedal 66 is pulled into the pedal body 61 to a position where it abuts against the installation surface (floor portion 8, fixed plate portion 52) of the operation pedal device 50 in front of the pedal body 61. Therefore, when pedal operation is not required, the extension pedal 66 can be stored to reduce the area occupied by the operation pedal device 50 in the front-rear direction on the floor portion 8. Since pedal operation is prohibited by changing the position of the extension pedal 66 to the second position, the operator can use the operation pedal device 50 as a footrest when in the second position. Since the extension pedal 66 also serves as a member for prohibiting pedal operation, it is not necessary to separately provide a pedal lock device for prohibiting pedal operation around the pedal body 61. Therefore, the operation pedal device 50 can be made compact in configuration. Furthermore, when the extension pedal 66 is in the first position that allows pedal operation, the extension pedal 66 is pulled rearward from the pedal body 61 to expand the stepping area, improving the operability of the operation pedal device 50. When changing the position of the extension pedal 66 from the second position to the first position, it is only necessary to pull the extension pedal 66 rearward, and it becomes possible to easily change the position to one that allows pedal operation in a small space. Furthermore, by making the operation pedal device 50 more compact than the conventional configuration, the freedom of installation location of the operation pedal device 50 is improved, and it can be easily installed even in a relatively small machine with a narrow space on the floor 8 in front of the driver's seat.

[0076] In the operation pedal device 50, the extension pedal 66 has a pair of left and right extension parts 67, 67 that extend in the front-rear direction and are provided parallel to each other. Furthermore, the left and right extension parts 67, 67 are accommodated toward the front of the pedal body 61 when the extension pedal 66 changes its position from the first position to the second position.

[0077] According to the operation pedal device 50 of this embodiment having the above-mentioned configuration, the extension pedal 66 can be simply configured, and in the second position in which the extension pedal 66 is housed in the pedal body 61, the operation pedal device 50 can be configured more compactly. This makes it possible to effectively utilize the limited space of the floor portion 8. Furthermore, it is possible to prevent the operator from getting on and off the driving unit 10 and from being hindered from operating other operation pedals.

[0078] In the operation pedal device 50, the second restricting portion 67b is provided on the extension portion 67, and the first restricting portion 68d is provided behind the extension portion 67. The pedal body 61 is provided with a guide portion 62b that guides the movement of the extension portion 67 when the extension pedal 66 changes its position between the first position and the second position. The pedal body 61 has a step portion 62 whose upper surface is a foot tread surface 62a, and the guide portions 62b are provided in pairs on the left and right sides of the rear side of the step portion 62, penetrating the step portion 62, and the extension portion 67 is loosely inserted into each of the left and right guide portions 62b, 62b. In addition, the extension portion 67 is disposed to extend rearward behind the guide portion 62b and above the foot tread surface 62a when in the first position. In addition, the guide portion 62b is not limited to a concave notch as long as it penetrates the step portion 62, and may be a circular, elliptical, or rectangular hole.

[0079] According to the operation pedal device 50 of this embodiment having such a configuration, since the extension portion 67 is loosely inserted into the guide portion 62b, the extension pedal 66 can be smoothly changed between the first position and the second position. Furthermore, since the guide portion 62b is provided penetrating the footboard portion 62, it is possible to fit the left and right ends of the left and right extension portions 67, 67 within the left and right width of the footboard portion 62 in a plan view. Therefore, the operation pedal device 50 can be configured compactly without expanding the area occupied in the left and right width directions.

[0080] In the operation pedal device 50 according to this embodiment, the first restricting portion 68d of the extension pedal 66 is the lower surface of the rear frame portion 68 that is inclined at a predetermined angle with respect to the extending direction of the extension portion 67 in a side view and protrudes rearward, and the first restricting portion 68d abuts against the foot tread surface 62a behind the guide portion 62b when the extension pedal 66 is in the second position. In this way, by making the first restricting portion 68d the lower surface of the rear frame portion 68, the members that constitute the extension pedal 66 do not protrude above the tread portion 62 of the pedal body 61 when the extension pedal 66 is in the second position, and the extension pedal 66 can be easily used as a footrest when pedal operation is not required.

[0081] In the operation pedal device 50 according to this embodiment, the pedal body 61 has an abutment portion 63d that abuts against the second restricting portion 67b when the extension pedal 66 is in the second position, and the abutment portion 63d is provided forward and below the guide portion 62b. In this manner, the pedal operation is restricted regardless of whether the pedal is stepped on in the forward or backward direction by the abutment of not only the first restricting portion 68d and the foot tread surface 62a but also the second restricting portion 67b and the abutment portion 63d. In this manner, the pedal operation can be safely restricted, so that it is possible to reliably prevent the operation of the working device unintended by the operator when the extension pedal 66 is in the second position and in the stored state.

[0082] In the operation pedal device 50 according to this embodiment, a retaining portion 69 is provided in front of the extension portion 67, which fits or engages with the guide portion 62b to prevent the front end portion 69b of the extension pedal 66 from falling off. This retaining portion 69 prevents the extension pedal 66 from falling off the pedal body 61 when the extension pedal 66 is in the first position.

[0083] The above-described embodiment is an example of the present invention, and the operation pedal device 50 according to the present invention is not limited to the above-described embodiment. Therefore, even if it is an embodiment other than the above-described embodiment, various modifications are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. In addition, the effects described in this disclosure are merely examples and are not limited, and other effects may be present.

[0084] In the above embodiment, an example has been described in which the operation pedal device 50 according to the present invention is employed as a pedal device for operating an attachment of an excavation work machine 1 equipped with a boomerang-shaped boom 21, but the present invention is not limited to this. In a work machine, for example, the operation pedal device according to the present invention can be employed as a pedal device for operating an offset boom cylinder of an excavation work machine equipped with an offset boom configured to be rotatable in the left and right directions relative to the machine body instead of the boomerang-shaped boom 21. Also, in a work machine mainly used for agricultural purposes, for example, when a grass cutter operated by a hydraulic cylinder is attached to the rear of a tractor, the operation pedal device according to the present invention can be employed as a pedal device for operating the hydraulic cylinder of the grass cutter.

[0085] In the above-described embodiment, a hydraulic pedal device has been described as an example of the operation pedal device 50, but this is not limiting. The operation pedal device may be any device that includes an operation conversion unit that can transmit the amount of pedal operation to the control valve, and the operation conversion method may be an electrical type that outputs an electric signal according to the amount of operation, or a mechanical type that mechanically transmits the operating force via a link member or the like.

[0086] The present invention can take the following forms. (1) An operating pedal device for a work machine comprising a pedal body supported so as to be swingable in a front-rear direction and an extension pedal attached to the pedal body, The extension pedal is attached to the pedal body so as to be capable of changing its position between a first position in which the extension pedal is pulled out rearward of the pedal body to allow rotation of the pedal body and a second position in which a front end of the extension pedal is brought into contact with a mounting surface of the operation pedal device in front of the pedal body to restrict rotation of the pedal body, When the extension pedal is in the second position, a first regulating portion that constitutes a lower surface of the extension pedal and a second regulating portion that constitutes an upper surface of the extension pedal forward of the first regulating portion regulate the forward rotation of the pedal body. Pedal device for operating a work machine. (2) The extension pedal has a pair of left and right extension parts extending in the front-rear direction and parallel to each other, When the extension pedal changes its position from the first position to the second position, the extension portion is accommodated toward the front of the pedal body. An operating pedal device for a work machine as described in (1) above. (3) The second restricting portion is provided on the extension portion, The first restricting portion is provided behind the extension portion. An operating pedal device for a work machine as described in (2) above. (4) The pedal body is provided with a guide portion that guides the movement of the extension portion when the extension pedal changes position between the first position and the second position. An operating pedal device for a work machine as described in (2) or (3). (5) The pedal body has a step portion whose upper surface serves as a stepping surface. The guide portions are provided in pairs on the left and right sides of the rear side of the step portion, penetrating the step portion, The extension portion is loosely inserted into each of the left and right guide portions. An operating pedal device for a work machine as described in (4) above. (6) When the extension pedal is in the second position, the first regulating portion abuts against the foot tread surface behind the guide portion. An operating pedal device for a work machine as described in (5) above. (7) The pedal body has an abutment portion that abuts against the second restriction portion when the extension pedal is in the second position. An operating pedal device for a work machine as described in (5) above. (8) The contact portion is provided forward and below the guide portion. An operating pedal device for a work machine as described in (7) above. (9) The extension portion is disposed to extend rearwardly behind the guide portion and above the foot tread surface when in the first posture. An operating pedal device for a work machine according to any one of (5) to (8). (10) A retaining portion is provided in front of the extension portion, the retaining portion being adapted to engage with the guide portion so as to retain the front end portion of the extension pedal in a retaining state. An operating pedal device for a work machine according to any one of (5) to (9). (11) The first restricting portion is a lower surface of a rear frame portion that protrudes rearward and is inclined at a predetermined angle with respect to the extension direction of the extension portion in a side view. The operating pedal device for a work machine according to any one of (2) to (10) above. [Explanation of symbols]

[0087] 1 Excavation machine (work machine) 2. Vehicles 3. Drilling Rig 5 Running part 7 Swivel Frame 8 Floor 8a Front step section 8b Rear step section 15 Driver's seat 49 PTO Service Port 50 Operation pedal device 51 Pilot valve 51a Casing 51b Flange part 52 Fixed plate part 54 Boots 55 Rotating shaft 60 Pedal section 61 Pedal body 62 Tread section 62a Foot Tread 62b Guide part 63 Support part 63a Horizontal plate section 63b Front upright plate part 63c Rear standing plate part 66 Extension Pedal 67 Extension section 67b Second Regulatory Division 68 Rear frame 68a Slope 68b Connection part 68c bent part 68d First Regulatory Division 69 Stopper 69a Step bending section 69c front end

Claims

1. An operating pedal device for a work machine comprising a pedal body supported so as to be swingable in a front-rear direction and an extension pedal attached to the pedal body, The extension pedal is attached to the pedal body so as to be capable of changing its position between a first position in which the extension pedal is pulled out rearwardly of the pedal body to allow rotation of the pedal body and a second position in which a front end of the extension pedal is brought into contact with a mounting surface of the operation pedal device in front of the pedal body to restrict rotation of the pedal body, When the extension pedal is in the second position, a first restricting portion that constitutes a lower surface of the extension pedal and a second restricting portion that constitutes an upper surface of the extension pedal forward of the first restricting portion restricts a forward rotation of the pedal body. An operating pedal device for a work machine.

2. The extension pedal has a pair of left and right extension parts extending in the front-rear direction and parallel to each other, When the extension pedal changes its position from the first position to the second position, the extension portion is accommodated in the pedal body toward the front thereof.

2. An operating pedal device for a work machine according to claim 1.

3. The second restricting portion is provided on the extension portion, The first restricting portion is provided behind the extension portion.

3. An operating pedal device for a work machine according to claim 2.

4. The pedal body is provided with a guide portion that guides the movement of the extension portion when the extension pedal changes position between the first position and the second position.

4. The operating pedal device for a work machine according to claim 3.

5. The pedal body has a step portion whose upper surface serves as a stepping surface. The guide portions are provided in pairs on the left and right sides of the rear side of the step portion, penetrating the step portion, The extension portion is loosely inserted into each of the left and right guide portions.

5. An operating pedal device for a work machine according to claim 4.

6. When the extension pedal is in the second position, the first restriction portion abuts against the foot tread surface behind the guide portion.

6. An operating pedal device for a work machine according to claim 5.

7. The pedal body has an abutment portion that abuts against the second restriction portion when the extension pedal is in the second position.

6. An operating pedal device for a work machine according to claim 5.

8. The contact portion is provided forward and below the guide portion. An operating pedal device for a work machine according to claim 7.

9. The extension portion is disposed to extend rearwardly behind the guide portion and above the foot tread surface when in the first posture.

6. An operating pedal device for a work machine according to claim 5.

10. A retaining portion is provided in front of the extension portion, the retaining portion being adapted to engage with the guide portion so as to retain the front end portion of the extension pedal in a retaining state.

6. An operating pedal device for a work machine according to claim 5.

11. The first restricting portion is a lower surface of a rear frame portion that protrudes rearward and is inclined at a predetermined angle with respect to the extension direction of the extension portion in a side view. The operating pedal device for a work machine according to any one of claims 2 to 10.

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