JP2007047865A - Operation lever device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability to the aged deterioration or the like of a protective boot by preventing the slippage of the boot. <P>SOLUTION: The operation lever device 11 comprises a pilot valve 12, a tilting member 15, a cam 16, a lever 18, a grip 20, a protective boot 22, a slippage preventive member 23 or the like. The slippage preventive member 23 includes a washer 24 fixed to the circumferential side of the lever 18 and an inner collar 25 of the protective boot 22, and the washer 24 regulates the downward movement of a mounting cylinder 22c, the inner collar 25 and the like. By this, even if the mounting cylinder 22c is loosened by a change with time or the like, or a downward external force or the like is applied to the protective boot 22, the downward slippage of the mounting cylinder 22C from the grip 20 can be prevented, and the mounting state can be stabilized over a long period of time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation lever device that is suitably used for operating various vehicles, machines, and the like including construction machines such as hydraulic excavators.

  Generally, for various vehicles, machines and the like operated by an operator, a hydraulic operation lever device (see, for example, Patent Documents 1, 2, and 3) or an electric operation lever device (see Patent Documents 4, 5). These operation lever devices are also used in construction machines such as hydraulic excavators.

JP 2003-122441 A JP 2002-146838 A JP-A-11-236905 Japanese Patent Laid-Open No. 11-296249 JP 2003-51231 A

  This type of prior art operating lever device can be tilted via a signal output unit that outputs a hydraulic signal or an electric signal according to the operation amount, and a tilting member (for example, a universal joint) to the signal output unit. And a grip provided on the tip side of the lever portion and gripped by an operator.

  Here, in the hydraulic (hydraulic pilot type) operation lever device, for example, a pressure reducing valve type pilot valve or the like is mounted on the signal output unit, and the pilot valve tilts the lever unit by the operator holding the grip. When the rolling operation is performed, a hydraulic signal (pilot pressure) corresponding to the operation amount is output to the outside.

  In addition, in the electric operation lever device, a detection unit including, for example, a stalk talk sensor, a rotation angle sensor, and the like is mounted on the signal output unit. And outputs a detection signal to the outside.

  On the other hand, as an operation lever device, a four-way type operation lever device that is tilted in an arbitrary direction combining the four directions including the front and rear directions and the left and right directions, and the front and rear directions (or A two-way operation lever device that is tilted only in the left and right directions) is used. In this case, in the four-direction type operation lever device, for example, four types of operations can be performed according to the operation direction of the lever portion, and in the two-direction type operation lever device, two types of operations can be performed.

  In such various operation lever devices, a cylindrical protective boot is provided between the signal output portion and the grip on the outer peripheral side of the lever portion, and the signal output portion is provided by the protective boot. Is protected from external dust, moisture and the like. In this case, the protective boot is formed as a bellows-like cylinder by a flexible material such as vinyl resin (PVC) or rubber, and deforms following the lever operation of the operator while covering the signal output portion from above. It is like that.

  For example, in the prior art described in Patent Document 1, the base end side of the protective boot is attached to an attachment portion or the like of the vehicle, and the distal end side of the protective boot is fitted to the outer peripheral side of the lever portion. Moreover, in the prior art described in patent document 2, it is set as the structure which attaches the front end side of a protective boot to the outer peripheral side of a grip. In these cases, for example, a boot mounting groove is provided on the outer peripheral side of the grip, and an annular protrusion is provided on the inner periphery on the front end side of the protective boot so that the annular protrusion is fitted into the boot mounting groove.

  By the way, in the above-described prior art, in order to fix the front end side of the protective boot, this is fitted to the outer peripheral side of the lever portion, or the annular protrusion provided on the front end side of the protective boot is attached to the boot mounting groove of the grip. It is configured.

  However, since the protective boot is made of, for example, vinyl-based resin, rubber, etc., when the hydraulic excavator is used for a long period of time, the front end side of the boot may be deformed so as to be loosened or stretched due to deterioration over time. is there.

  For this reason, in the prior art, the front end side of the protective boot may be disengaged from the predetermined mounting site and may be displaced to the console box side, which may interfere with lever operation or impair the function of the boot. There is a problem of being.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to stabilize the mounting state of the protective boot over a long period of time and reliably prevent the boot from falling off, An object of the present invention is to provide an operating lever device that can improve durability.

  In order to solve the above-described problem, the present invention provides a signal output unit that outputs a hydraulic signal or an electric signal according to an operation amount, and a lever unit that is provided on the signal output unit so as to be tiltable via a tilting member. A grip that is provided on the distal end side of the lever portion and is gripped by an operator, and a cylindrical protective boot that is positioned between the grip and the signal output portion and is inserted into the outer peripheral side of the lever portion. It is applied to the provided operating lever device.

  A feature of the configuration employed by the invention of claim 1 is that a slip-off preventing member for preventing the protective boot from slipping downward is provided on the outer peripheral side of the lever portion.

  According to a second aspect of the present invention, the outer peripheral side of the lever portion is provided with an outward projecting portion projecting in the radial direction, and the inner peripheral side of the protective boot is positioned above the outward projecting portion. An inward projecting portion that projects in the radial direction is provided, and the outward projecting portion and the inward projecting portion constitute the slip-off preventing member.

  Further, according to the invention of claim 3, the lever portion is provided with an outward projecting portion projecting in the radial direction on the outer peripheral side of the lever portion, and is located on the inner peripheral side of the protective boot above the outward projecting portion. A cylindrical body inserted on the outer peripheral side of the lever portion is provided, and the outwardly projecting portion and the cylindrical body constitute the slip-off preventing member.

  According to the first aspect of the present invention, it is possible to restrict the leading end side (upper side) of the protective boot from moving downward by the slip-off preventing member, and it is possible to reliably prevent the protective boot from slipping down. . As a result, for example, even when the upper side of the protective boot is loosened due to deterioration over time or a downward external force or the like is applied to the boot, the protective boot can be stably held at a predetermined mounting position. Can be stabilized over a period of time.

  Therefore, the slip-off prevention member can be easily realized by utilizing the structure of the lever portion and the like, and the dustproof and waterproof function of the protective boot can be maintained by the simple structure, and the durability can be improved. For this reason, for example, there is no need to process and form a structure for firmly attaching the protective boot to the lever portion, grip, etc., and no similar mounting structure is required on the protective boot side, so a mold for molding these parts Etc. can be simplified and the cost can be reduced.

  Moreover, according to invention of Claim 2, it can restrict | limit that the inward protrusion by the side of a protection boot moves below by the outward protrusion by the side of a lever part. Thereby, a slip-off prevention member can be constituted by the outward projection and the inward projection, and the protective boot can be reliably prevented from slipping down.

  Furthermore, according to the invention of claim 3, the cylindrical body can be provided on the inner peripheral side of the protective boot, for example, in a state of being inserted into the outer peripheral side of the lever portion, and this cylindrical body moves downward. Can be regulated by the outward projection. Thereby, a slip-off prevention member can be constituted by the outward projection and the cylindrical body, and the protective boot can be reliably prevented from slipping down.

  In this case, since the cylindrical body only needs to be inserted through the outer peripheral side of the lever portion, the assembling work can be performed efficiently. Moreover, as a cylindrical body, the elastic material which consists of a resin pipe, a rubber pipe etc., for example, or a foaming material can be used. In this case, the shape of the cylindrical body does not have to correspond exactly to the shape of the parts such as the lever portion and the protective boot, so that the cylindrical body can be easily formed with the minimum component accuracy. It is possible to reduce the weight and cost of the slip-off preventing member.

  Hereinafter, an operation lever device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 5 show a first embodiment, and in this embodiment, a case where the operation lever device is applied to a construction machine will be described as an example.

  In the figure, reference numeral 1 denotes a small-swivel hydraulic excavator as a construction machine. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and an upper portion mounted on the lower traveling body 2 so as to be pivotable. The revolving unit 3 and a working device 6 (described later) for excavating work such as earth and sand are provided on the front side of the upper revolving unit 3 so as to move up and down.

  Here, the upper swing body 3 includes a swing frame 4 that forms a support structure, a counterweight 5 that is provided on the rear end side of the swing frame 4 and balances the weight with the work device 6, and a cab 7 described later. It is roughly constituted by.

  Further, the upper swing body 3 is compactly formed so as to be entirely within a predetermined swing radius defined by the rear end face of the counterweight 5, and constitutes a small swing type hydraulic excavator 1. For this reason, the upper turning body 3 can turn within the vehicle width of the lower traveling body 2, for example.

  Reference numeral 6 denotes an offset type working device provided on the front side of the upper swing body 3. The working device 6 includes a lower boom 6A attached to the swivel frame 4 so as to be able to be lifted and lowered, and a left-hand side of the lower boom 6A. The upper boom 6B is swingably attached to the right, the arm support 6C is swingably attached to the front end of the upper boom 6B, and is pivotable to the arm support 6C. An attached arm 6D, a bucket 6E rotatably attached to the tip side of the arm 6D, a link 6F connecting the lower boom 6A and the arm support 6C, and each cylinder for operating these parts It is roughly composed of

  The work device 6 can translate (offset) the arm 6D, the bucket 6E, and the like in the left and right directions on the distal end side of the lower boom 6A. In this state, the arm 6D, the bucket By excavating 6E, excavation work such as a gutter is performed.

  Reference numeral 7 denotes a cab provided on the left side of the front portion of the revolving frame 4, for example. The cab 7 defines a driver's cab. Left and right operation lever devices 11, 28, etc. are arranged.

  In this case, the right side surface portion of the cab 7 is positioned to the left as compared with, for example, a cab of a hydraulic excavator provided with a swing type working device in order to avoid interference when the working device 6 is offset to the left side. It is arranged. For this reason, the width dimension of the cab 7 in the left and right directions is smaller than that of the swing type excavator cab.

  Reference numeral 8 denotes a driver seat provided in the cab 7, which is seated by an operator who operates the excavator 1. A traveling lever / pedal device 9 for operating the traveling of the lower traveling body 2 is provided on the front side of the driver seat 8, and left and right operation levers, which will be described later, are provided on both the left and right sides of the driver seat 8. Devices 11 and 28 are provided.

  Reference numeral 10 denotes a left console box disposed on the left side of the driver's seat 8, and the left console box 10 is formed as a hollow box-like body made of, for example, a resin material as shown in FIGS. Further, the left console box 10 is configured by assembling an upper cover 10A and a lower cover 10B, and an upper portion 10C of the upper cover 10A has an opening to which the left operation lever device 11 is attached as shown in FIG. 10D is provided.

  Next, the operation lever device according to the present embodiment will be described. Reference numeral 11 denotes a hydraulic pilot type operation lever device provided in the left console box 10. In this case, in the present embodiment, the left operation lever device 11 is tilted in an arbitrary direction that combines, for example, four directions including the front and rear directions and the left and right directions. Although illustrated as a device, the present invention may be applied to a two-way operation lever device that is tilted only in the front and rear directions (or left and right directions).

  The left operation lever device 11 is roughly constituted by a pilot valve 12, a tilting member 15, a cam 16, a lever portion 18, a grip 20, a protective boot 22 and a slip-off preventing member 23 which will be described later. When the operator tilts the grip 19 (lever portion 18) forward and backward, the pusher 12B before and behind the pilot valve 12 is pushed, and for example, the upper swing body 3 swings. . Further, when the lever portion 18 is tilted to the left and right, the left and right pushers 12B are pressed, whereby the arm 6D of the working device 6 is rotated.

  12 is a pressure reducing valve type pilot valve provided in the left console box 10 as a signal output unit. The pilot valve 12 includes, for example, a turning control valve and an arm control valve (both shown in FIG. When the operator tilts the lever portion 18, the pilot pressure (hydraulic signal) corresponding to the operation direction and the operation amount is output to each control valve.

  Here, as shown in FIGS. 3 and 4, the pilot valve 12 is provided in a substantially cylindrical casing 12A housed in the left console box 10, and is slidably provided in the casing 12A. For example, four pushers 12 </ b> B (only a part of which are shown) are provided. The casing 12A is fixed to the frame-shaped support plate 14 by a plurality of fixing screws 13, and is attached to the upper surface portion 10C together with the support plate 14 at a position covering the opening 10D of the left console box 10 from the inside. Yes.

  Further, two pushers 12B are arranged on the front, rear both sides, left and right sides, respectively, with the tilting member 15 as the center. When the operator tilts the lever portion 18, one of the pushers 12B is selectively pushed by a cam 16, which will be described later, and the pilot pressure output from the pilot valve 12 to each control valve changes.

  Reference numeral 15 denotes a tilting member (for example, a universal joint) provided in the casing 12A of the pilot valve 12. The tilting member 15 supports the lever portion 18 so as to be tiltable. The tilting member 15 is rotatably connected to the lower joint portion 15A attached to the casing 12A and the lower joint portion 15A. The tilting member 15 is composed of four directions including a front direction, a rear direction, a left direction, and a right direction. It is comprised by the upper side joint part 15B rotated to the arbitrary directions match | combined. In addition, a disc-shaped cam 16 that contacts the pushers 12B and a cylindrical nut 17 are screwed into the upper joint portion 15B.

  Reference numeral 18 denotes a lever portion that is provided on the casing 12A of the pilot valve 12 so as to be tiltable via a tilting member 15. The lever portion 18 is formed by, for example, a metal rod bent in a substantially "<" shape. The tip end side protrudes obliquely upward from the opening 10D of the left console box 10.

  Here, the lever portion 18 is provided on the intermediate rod 18A located in the middle portion in the longitudinal direction and the proximal end (lower side) of the intermediate rod 18A, and is screwed to the cylindrical nut 17 so as to be tilted. The lower screw portion 18B attached to the 15 upper joint portions 15B and the upper screw portion 18C provided on the distal end side (upper side) of the intermediate rod 18A. A lever tightening nut 19 that contacts the upper end surface of the cylindrical nut 17 is screwed onto the outer peripheral side of the lower screw portion 18B. The lever tightening nut 19 prevents the lever portion 18 from being loosened. .

  Reference numeral 20 denotes a grip provided by being screwed to the upper screw portion 18C of the lever portion 18. The grip 20 is formed into a long and narrow bar shape by, for example, a resin material and is gripped when the operator operates the lever portion 18. It is. An annular boot mounting groove 20 </ b> A is provided on the outer periphery on the proximal end side of the grip 20.

  Reference numeral 21 denotes a grip tightening nut for loosening the grip 20. The grip tightening nut 21 is screwed to the upper screw portion 18 </ b> C of the lever portion 18 in the mounting cylinder portion 22 </ b> C of the protective boot 22. It is in contact with the end side. Further, the grip tightening nut 21 sandwiches an inner flange portion 25 of the protective boot 22 with a washer 24 described later, thereby preventing the protective boot 22 from slipping in cooperation with the washer 24.

  Reference numeral 22 denotes a cylindrical protective boot for protecting equipment such as the pilot valve 12 from external dust, moisture, etc. The protective boot 22 is located between the pilot valve 12 (or the left console box 10) and the grip 20. The lever portion 18 is inserted through the outer peripheral side. The protective boot 22 is configured to flexibly deform following the tilting operation of the lever portion 18 while covering the gap between the opening portion 10D of the left console box 10 and the lever portion 18.

  Here, as shown in FIGS. 4 and 5, the protective boot 22 is formed in a bellows shape from a flexible material such as vinyl resin or rubber, and has a cylindrical bellows portion 22A and a base end of the bellows portion 22A. An annular mounting flange 22B that is located on the side and extends radially outward, a short mounting cylinder 22C provided on the distal end side of the bellows part 22A, and a radial direction from the inner periphery on the distal end side of the mounting cylindrical part 22C The ring-shaped protrusion 22D protrudes inward and an inner flange 25 described later.

  A cam 16, a cylindrical nut 17, a lever portion 18, a lever tightening nut 19, a washer 24, and the like are disposed on the inner peripheral side of the bellows portion 22A. Further, the mounting flange portion 22B is mounted in a state of being sandwiched between the upper surface portion 10C and the support plate 14 at a position surrounding the opening 10D of the left console box 10, and is supported by the upper surface portion 10C by a mounting screw 26 described later. It is fastened together with the plate 14. On the other hand, the mounting cylinder portion 22 </ b> C is inserted into the base end side outer periphery of the grip 20, and the annular protrusion 22 </ b> D is fitted into the boot mounting groove 20 </ b> A of the grip 20.

  Reference numeral 23 denotes a slip-off prevention member provided on the outer peripheral side of the lever portion 18, and the slip-off prevention member 23 includes a washer 24 described later and an inner flange portion 25 of the protective boot 22. The side (mounting cylinder portion 22C, etc.) is prevented from slipping downward.

  Reference numeral 24 denotes a washer as an outward projecting portion provided on the outer peripheral side of the intermediate rod 18A of the lever portion 18. The washer 24 is formed of, for example, a general-purpose annular metal plate or the like, and is intermediated by means such as welding. It is fixed to the upper side of the rod 18A.

  Here, the washer 24 is located between the tilting member 15 and the grip 20, protrudes radially outward from the lever portion 18, abuts against the inner flange portion 25 of the protective boot 22 from below, and the inner flange portion. 25 is supported. Thus, the washer 24 restricts the downward movement of the attachment cylinder portion 22C, the inner flange portion 25 and the like of the protective boot 22 and prevents the attachment cylinder portion 22C from falling off the grip 20.

  Further, the washer 24 sandwiches the inner flange portion 25 with the grip tightening nut 21. For this reason, the mounting cylinder portion 22C of the protective boot 22 is configured not to be easily detached from the grip 20 even when a downward external force or the like is applied to the bellows portion 22A, for example.

  Reference numeral 25 denotes an inner flange as an annular inward projection provided on the inner periphery of the front end of the protective boot 22, and the inner flange 25 is made of a material such as vinyl resin or rubber, for example, bellows. It is integrally formed between the portion 22A and the mounting tube portion 22C. The inner flange 25 protrudes inward in the radial direction from the mounting cylinder 22 </ b> C, contacts the upper end surface of the washer 24, and is sandwiched between the grip tightening nut 21 and the washer 24. As a result, the inner flange 25 is restricted from moving in the axially upward and downward directions.

  4 and the like, reference numeral 26 denotes a plurality of mounting screws for fastening the upper surface portion 10C of the left console box 10, the support plate 14 and the mounting flange portion 22B of the protective boot 22, and these mounting screws 26 are the upper surface portion 10C. Are respectively inserted into screw insertion holes provided in the attachment flange portion 22B, and are screwed to the support plate 14 through these portions.

  On the other hand, in FIG. 2, reference numeral 27 denotes a right console box disposed on the right side of the driver's seat 8, and a right operation lever device having substantially the same structure as the left operation lever device 11 is provided on the upper surface of the right console box 27. 28 is provided. When the lever portion 18 of the right operation lever device 28 is tilted forward and backward, the lower boom 6A of the working device 6 is lifted and tilted. When the lever portion 18 is tilted left and right, The bucket 6E of the working device 6 is configured to rotate.

  The small swing excavator 1 equipped with the operation lever devices 11 and 28 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when excavation work is performed using the hydraulic excavator 1, the operator gets into the cab 7 and sits on the driver's seat 8. In this case, the cab 7 of the excavator 1 provided with the offset type working device 6 is formed with small left and right width dimensions so as to avoid interference with the working device 6, and both the left and right sides of the driver's seat 8. Further, since the operating lever devices 11 and 28 are arranged in a compact manner, the body of the operator who is going to sit on the driver's seat 8 may come into contact with the protective boot 22 of any of the operating lever devices 11 and 28.

  However, the mounting cylinder 22C of the protective boot 22 is restricted from moving downward by the slip-off preventing member 23, and the inner flange 25 is sandwiched between the grip tightening nut 21 and the washer 24. It is possible to prevent the upper side of the protective boot 22 from slipping off the grip 20 due to contact with an operator or the like. Further, even when the mounting cylinder portion 22C is loosened due to deterioration over time or the like, the protective boot 22 can be kept in a predetermined position by the slip-off preventing member 23.

  An operator seated in the driver's seat 8 can drive the vehicle to the work place by operating the left and right travel lever / pedal devices 9. At the work place, the operator holds the grips 20 of the left and right operation lever devices 11 and 28 and tilts them as necessary, thereby turning the upper swing body 3 or the work device 6. The lower boom 6A, arm 6D, bucket 6E, etc. can be operated to perform excavation work.

  Thus, according to the present embodiment, since the slip-off preventing member 23 for the protective boot 22 is provided on the outer peripheral side of the lever portion 18, the protective boot 22 is attached by the washer 24 and the inner flange portion 25. The cylindrical portion 22C and the like can be prevented from moving downward, and it is possible to reliably prevent the upper side of the protective boot 22 from detaching from the grip 20 and falling downward.

  Thus, for example, even when the mounting cylinder portion 22C is loosened due to deterioration over time or a downward external force is applied to the bellows portion 22A, the protective boot 22 can be stably held at a predetermined mounting position. The state can be stabilized over a long period of time.

  Therefore, by providing the washer 24 on the outer peripheral side of the lever portion 18, a slip-off preventing member can be easily realized by utilizing the structure of the lever portion 18, and the dustproof and waterproof function of the protective boot 22 can be realized with a simple structure. Can be maintained, and durability can be improved. For this reason, for example, it is not necessary to process and form a structure for firmly attaching the protective boot 22 to the lever portion 18, the grip 20, etc., and a similar mounting structure is not necessary on the protective boot 22 side. Molds to be molded can be simplified and costs can be reduced.

  In this case, since the washer 24 is used, the slip-off preventing member can be easily realized by the washer 24, which is a general-purpose component, and the structure can be simplified and the cost can be reduced. Moreover, since the washer 24 is fixed to the outer peripheral side of the lever portion 18, the inner flange portion 25 of the protective boot 22 can be sandwiched between the washer 24 and the grip tightening nut 21, thereby the protective boot 22. The upper side of the can be more stably fixed.

  On the other hand, since the right operating lever device 28 is configured in substantially the same manner as the left operating lever device 11, the protective boot 22 can be reliably prevented from falling off. For this reason, even when the operation lever devices 11 and 28 are disposed compactly on both the left and right sides of the driver's seat 8, such as a small swing type excavator 1 equipped with an offset type working device 6, for example. The operator can smoothly sit on the driver's seat 8 without worrying about the slipping off of the protective boot 22 and the like, and can maintain a good working environment.

  Next, FIGS. 6 and 7 show a second embodiment according to the present invention, and the feature of this embodiment is that a cylindrical elastic material is used for the slip-off preventing member. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 31 denotes a slip-off preventing member used in the present embodiment in place of the slip-off preventing member 23 of the first embodiment. The slip-off preventing member 31 includes an inner flange 25 of the protective boot 22 and a later-described The lever tightening nut 32 and the elastic bush 33 are configured.

  In this case, the lever tightening nut 32 is screwed to the lower screw portion 18B of the lever portion 18 at a position where it abuts on the upper end surface of the cylindrical nut 17 in the same manner as in the first embodiment. Loosening is performed. However, the lever tightening nut 32 of the present embodiment constitutes an annular outward protruding portion that protrudes radially outward from the lever portion 18.

  Reference numeral 33 denotes an elastic bush as a cylindrical body, and the elastic bush 33 is made of an elastic material such as an elastic resin pipe or rubber pipe. 6 and 7, the elastic bush 33 is positioned on the upper side of the lever tightening nut 32 and is inserted into the outer peripheral side of the intermediate rod 18A of the lever portion 18 so as to extend radially outward from the lever portion 18. It protrudes.

  The elastic bush 33 is in contact with the upper end surface of the lever tightening nut 32 at the base end side (lower end side) and is in contact with the inner flange portion 25 of the protective boot 22 from below. . Thereby, the elastic bush 33 is positioned in the axial direction between the lever tightening nut 32 and the inner flange 25, and in this state, the inner bush 25 is supported from below and the elastic bush 33 is connected to the grip tightening nut 21. The inner flange 25 is sandwiched between them.

  For this reason, the downward movement of the upper side of the protective boot 22 and the elastic bush 33 is restricted by the lever tightening nut 32. In this case, the inner flange portion 25 of the protective boot 22 is inclined obliquely together with the distal end side of the bent lever portion 18, and the elastic bush 33 is elastically deformed following the inclined state of the inner flange portion 25. This is elastically pressed upward.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment, and the upper side of the protective boot 22 (the mounting cylinder portion 22C) by the slip-off preventing member 31. Etc.) can be prevented from slipping down.

  In particular, in the present embodiment, the elastic bush 33 is used for the slip-off prevention member 31. Therefore, the elastic bush 33 is easily inserted into the lever portion 18 by inserting the elastic bush 33 into the outer peripheral side of the lever portion 18. Assembling efficiency can be improved.

  The elastic bushing 33 can be positioned in the axial direction by using a conventional lever tightening nut 32, and the mounting cylinder portion 22 </ b> C of the protective boot 22 and the elastic bushing 33 can be positioned using the lever tightening nut 32. It is possible to reliably regulate the downward movement. For this reason, for example, the slip-off preventing member can be easily realized by using the elastic bush 33 made of, for example, a general-purpose resin pipe or rubber pipe, and the structure can be simplified and the cost can be reduced.

  In this case, the elastic bush 33 can be elastically deformed in accordance with, for example, the bent shape of the lever portion 18 or the shape (inclined state) of the inner flange portion 25 of the protective boot 22. For this reason, when the elastic bush 33 is molded, it is not necessary to strictly correspond to the shape of the parts such as the lever portion 18 and the protective boot 22, so that the elastic bush 33 can be easily formed with a minimum part accuracy. Can increase productivity.

  Next, FIGS. 8 and 9 show a third embodiment according to the present invention, and the feature of this embodiment is that the slip-off preventing member is made of a cylindrical foamable material. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 41 denotes a slip-off preventing member used in the present embodiment in place of the slip-off preventing member 23 of the first embodiment. The slip-off preventing member 41 includes the inner flange portion 25 of the protective boot 22 and the first Similarly to the second embodiment, it is constituted by a lever fastening nut 42 constituting an annular outward projecting portion and a foam material 43 described later.

  Reference numeral 43 denotes a foamed material as a cylindrical body. The foamed material 43 is resin-molded into a cylindrical shape by, for example, a resin material having foamability. As an example of such a resin material, a rubber-based foamed urethane ( EPDM) and the like are used. 8 and 9, for example, the foam material 43 is formed in a substantially pyramid shape corresponding to the shape of the upper inner side of the protective boot 22, and substantially fills the space on the upper side in the bellows portion 22A. Is arranged in.

  The foam material 43 is positioned above the lever tightening nut 42 and is inserted into the outer peripheral side of the intermediate rod 18A of the lever portion 18 so as to protrude radially outward from the lever portion 18 and to the inside of the protective boot 22. It abuts on the flange 25 from below.

  Further, the foam material 43 is configured to come into contact with the upper end surface of the lever tightening nut 42 when, for example, a downward external force is applied to the protective boot 22, and the upper side of the protective boot 22 and the foam material 43 are The lever tightening nut 42 substantially restricts the downward movement.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first and second embodiments. In particular, in this embodiment, since the foam material 43 is used for the slip-off preventing member 41, the foam material 43 is inserted into the outer peripheral side of the lever portion 18 so that the lever portion 18 is efficiently assembled. Can be attached.

  In addition, for example, the foam material 43 can be easily formed using a general-purpose resin material such as urethane foam, and the shape can be freely adjusted to the bent shape of the lever portion, the shape of the protective boot, etc. Simplification of the structure and cost reduction can be achieved. Furthermore, by using the foam material 43, the slip-off prevention member can be reduced in weight.

  In each of the above embodiments, the hydraulic pilot type operation lever devices 11 and 28 have been described as examples. However, the present invention is not limited to this. For example, the present invention is applied to an electric operation lever device that outputs an electric signal corresponding to the lever operation amount of the operator by detecting the displacement of the pusher 12B by a change in resistance value or the like. Also good.

  Further, in the embodiment, for example, a four-direction operation lever device 11 is operated to tilt the operation device 6 and the like by being tilted in an arbitrary direction in which four directions including the front and rear directions and the left and right directions are combined. , 28 as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a two-way operation lever device that is tilted only in the front and rear directions (or left and right directions). As shown in FIG. 6, the present invention may be applied to a traveling lever / pedal device 9 that is tilted forward and backward in the vehicle.

  In the second embodiment, the elastic bush 33 is used for the slip-off prevention member 31. However, the present invention is not limited to this. For example, a cylindrical body is formed of a metal material, a ceramic material, a hard resin material, and the like, and the cylindrical body is inserted into the outer peripheral side of the lever portion 18 as a part of a slip-off prevention member. It is good also as a structure.

  In the embodiment, the mounting cylinder portion 22 </ b> C of the protective boot 22 is attached to the grip 20. However, the present invention is not limited to this. For example, as described in Patent Document 1 of the prior art, the upper side of the protective boot 22 may be attached to the outer peripheral side of the lever portion.

  Further, in the embodiment, the configuration is applied to the hydraulic excavator 1 including the offset working device 6. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a swing type work device having a swing post, or a hydraulic excavator provided with a mono-boom type work device that does not perform an offset operation or a swing operation. be able to.

  Furthermore, in the embodiment, the case where the present invention is applied to the small swing type hydraulic excavator 1 is described as an example. However, the present invention is not limited to this, and can also be applied to construction machines such as medium- and large-sized hydraulic excavators, hydraulic cranes, wheel loaders, road rollers, etc., and vehicles such as automobiles, industrial, and agricultural It can be widely applied to other machines.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a small turning hydraulic excavator applied to a first embodiment of the present invention. It is sectional drawing which looked at the inside of the cab of a hydraulic shovel from the arrow II-II direction in FIG. It is the front view which looked at the operating lever apparatus by the 1st Embodiment of this invention from the arrow III-III direction in FIG. It is the expanded sectional view which expanded the operation lever apparatus from the arrow IV-IV direction in FIG. It is a disassembled sectional view shown in the state before assembling the operation lever device. It is the expanded sectional view which looked at the operating lever apparatus by the 2nd Embodiment of this invention from the same position as FIG. It is a disassembled sectional view shown in the state before assembling the operation lever device. It is the expanded sectional view which looked at the operating lever apparatus by the 3rd Embodiment of this invention from the same position as FIG. It is a disassembled sectional view shown in the state before assembling the operation lever device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 6 Working device 7 Cab 8 Driver's seat 10, 27 Console box 11, 28 Operation lever device 12 Pilot valve (signal output unit)
DESCRIPTION OF SYMBOLS 14 Support plate 15 Tilt member 16 Cam 17 Cylindrical nut 18 Lever part 20 Grip 21 Grip clamping nut 22 Protective boot 23, 31, 41 Slip prevention member 24 Washer (outward protrusion)
25 inner buttocks (inward projection)
32, 42 Lever tightening nut (outward projection)
33 Elastic bush (tubular body)
43 Foam (tubular)

Claims (3)

A signal output unit that outputs a hydraulic signal or an electric signal according to an operation amount, a lever unit that is provided on the signal output unit so as to be tiltable via a tilting member, and an operator that is provided on the distal end side of the lever unit In an operation lever device comprising: a grip gripped by: and a cylindrical protective boot that is positioned between the grip and the signal output unit and is inserted into the outer peripheral side of the lever unit;
An operation lever device characterized in that a slip-off prevention member for preventing the protective boot from slipping downward is provided on the outer peripheral side of the lever portion.   An outward projecting portion projecting radially is provided on the outer peripheral side of the lever portion, and an inward projecting portion projecting radially is located on the inner peripheral side of the protective boot and located above the outward projecting portion. The operating lever device according to claim 1, wherein the operating lever device is configured by the outward projecting portion and the inward projecting portion constituting the slip-off preventing member.   An outward projecting portion projecting in the radial direction is provided on the outer peripheral side of the lever portion, and the inner peripheral side of the protective boot is positioned above the outward projecting portion and is inserted into the outer peripheral side of the lever portion. The operating lever device according to claim 1, wherein a cylindrical body is provided, and the slip-off preventing member is constituted by the outward projecting portion and the cylindrical body.

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