JP2016130036A - Steering device of work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steering device, in a work vehicle enabling steering during vehicle travel and various operations relative to a work machine to be performed in a single operator cab, that can attain, by a simple method, theft prevention of the work vehicle, enlargement of a surplus space in the operator cab, and improvement of visibility from an operator seat, respectively.SOLUTION: In a work vehicle provided with a steering handle 2 for vehicle steering and various pieces of mechanical equipment relative to a work machine 13 in an operator cab 12 on a vehicle body, as a steering device, the steering handle 2 is detachably coupled to a steering shaft 3, and between the steering handle 2 and the steering shaft 3, there are provided detent means 4 for disabling relative rotation of the steering handle 2 to the steering shaft 3 and lock means 5 for locking the steering handle to the steering shaft so as not to be detached, so that the above problem can be solved and safety can be secured even in the device in which the steering handle 2 is separable.SELECTED DRAWING: Figure 6

Description

  The present invention provides a steering device for a work vehicle in which a single driver's cab and a work machine are mounted on a vehicle body, and further, steering during vehicle travel and various operations related to the work machine can be performed in the single driver's cab. It is about.

  As a typical example of a work vehicle that can perform various operations related to steering and working machines during vehicle travel in a single driver's cab, for example, there is a wheel crane as shown in FIG. 1 (hereinafter referred to as a crane work vehicle). In addition to the crane work vehicle, a work vehicle such as a wheeled excavator or a forklift can be used as the work vehicle targeted in the present application.

  A work vehicle (crane work vehicle) shown in FIG. 1 has a swivel base 11 mounted on a vehicle body 1 and is equipped with a single cab 12 and a work machine (crane work machine) 13. . In addition, the crane working machine 13 used in FIG. 1 is configured such that crane work can be performed by suspending a load with a hook from the tip of the boom 14.

  In the driver's cab 12, as shown in FIG. 2, a driver's seat 15, a steering handle 2 for steering a vehicle, and various equipment related to the work implement 13 (operation lever 16, work state display section 17, various operation switches 18, etc.) Is provided. Note that the work state display unit 17 displays, for example, AML, and is either left or right (in the illustrated example, left side) avoiding the meter display unit 19 when viewed from the driver's seat 15 in front of the steering wheel 2. It is installed at a position deviated from. The various operation switches 18 are used to perform various types of switching related to screen switching of the work state display unit 17 and control of the work machine, and are provided in the vicinity (lower position) of the work state display unit 17.

  In the crane work vehicle shown in FIGS. 1 and 2, the operator steers the steering wheel 2 from the cab 12 (driver's seat 15) when traveling on the work vehicle, while the operator operates the cab 12 (driver's seat 15) when working. Thus, various operations related to the work machine 13 can be performed, and the work state of the work machine can be confirmed on the work state display unit 17.

  By the way, the invention of the present application is intended to prevent theft of a work vehicle in this type of work vehicle (a work vehicle in which various operations relating to steering and work equipment during vehicle travel and confirmation of work conditions can be performed in a single cab). Improvement related to the above, improvement in ease of getting on and off the driver's seat 15, and improvement in the visibility of the work state display unit 17 and the operability of various operation switches 18 when the work machine 13 is working. However, the conventional ones have the following backgrounds.

  First, there have been various devices for preventing theft of work vehicles, and the present applicant has also disclosed, for example, JP 2009-154740 A (Patent Document) as a technology for preventing theft of work vehicles. The proposal shown in 1) is proposed.

  The work vehicle antitheft technology according to this known example (Patent Document 1) is applied to an in-vehicle crane (called a cargo crane, which operates a crane work machine from outside the cab). By setting the control device to the anti-theft mode with the switch means, the operation of the hydraulic control valve that controls the hydraulic actuator is restricted, and the operation for the purpose of theft is performed during storage unless the anti-theft mode is released. Also, the vehicle cannot be driven.

  However, in the anti-theft technology of this known example (Patent Document 1), if the anti-theft function is not set without setting the anti-theft mode, the anti-theft function naturally does not work, so there is a risk of theft, and the theft when the power is turned off. It becomes impossible to identify whether or not the prevention mode is set.

  On the other hand, in this type of work vehicle, the space in the driver's cab 12 is relatively narrow, and if the steering handle 2 is fixedly installed in the driver's cab 12, the steering handle 2 is obstructive when getting in and out of the driver's seat 15. become.

  Further, when the steering handle 2 is provided, the steering handle 2 obstructs the view from the driver seat 15. In particular, when the work machine 13 is working, it is not necessary to visually recognize the traveling meter display unit 19 immediately in front of the driver's seat 15, but the operator can visually recognize the work state display unit 17 from the driver's seat 15 or In order to operate the various operation switches 18, it is necessary to avoid the steering handle 2 (in this case, the steering handle 2 may get in the way).

JP 2009-154740 A

  Accordingly, the present invention is a work vehicle that can perform various operations related to steering and work equipment during vehicle travel, confirmation of work conditions, etc. in a single driver's cab. The object of the present invention is to provide a steering device that can achieve an increase in excess space in a room and an improvement in visibility from a driver's seat, as well as safety.

  The present invention has the following configuration as means for solving the above problems. The invention of the present application is a working vehicle steering apparatus in which a single cab and work implement are mounted on a vehicle body, and further, a steering handle for steering a vehicle and various equipment relating to the work implement are provided in the cab. It is targeted.

  In the working vehicle steering device according to the present invention, the steering handle is detachably connected to the steering shaft, and the steering handle is disposed between the steering shaft and the steering shaft. Rotation preventing means by concave / convex fitting between the concave portion and the convex portion for making the relative rotation impossible, and a lock member and a lock receiver for locking the steering handle to the steering shaft so as not to be detached. It is characterized in that a lock means is provided for each.

  In the steering device of the present application, the steering handle is detachable from the steering shaft. When the work vehicle is traveling, the steering handle is connected to the steering shaft for steering. On the other hand, since the steering by the steering handle is unnecessary when working with the work implement, the steering handle can be separated from the steering shaft. Furthermore, when the work vehicle is placed in a storage location, the steering handle separated from the steering shaft can be stored in another location outside the cab (a location that is not visible to the public). If the steering handle is separated from the steering shaft and stored elsewhere, it will be easily noticed that there is no steering handle, and of course the work vehicle will not be able to travel (the state with anti-theft function). Can be confirmed.

  In the present invention, in the state where the steering handle is connected to the steering shaft, the detent means (which makes the recesses and the projections non-rotatable by fitting the recesses and protrusions relative to each other) and the lock means (the lock member and the lock) The steering handle can be maintained in a state that does not hinder the steering with respect to the steering shaft.

  The steering device according to the present invention is a work vehicle in which a steering handle for vehicle steering and various equipment related to a work machine are provided in a single driver's cab, and the steering handle is detachable from the steering shaft. The steering handle can be separated from the steering shaft except when traveling.

  If the steering handle is separated from the steering shaft in this way, the following effects are obtained.

  1stly, since the part which the steering handle occupied becomes a space part (excess space), boarding / alighting to a driver's seat becomes easy.

  Second, since the field of view from the driver's seat that has been blocked by the steering handle is widened, for example, the visibility to the work state display section (located ahead of the steering handle position) is improved during work by the work implement, and the work It becomes easy to operate various operation switches near the status display section.

  Thirdly, by separating the steering handle, the steering handle can be stored in an invisible place. In this case, the work vehicle is stolen because there is no steering handle (the work vehicle cannot be steered). There is no (theft prevention).

  When the steering handle is separated from the steering shaft, it is clear that the work vehicle cannot be steered, and it becomes obvious at a glance whether the work vehicle is in an anti-theft state.

  In the steering device of the present invention, when the steering handle is connected to the steering shaft, the steering handle is attached to the steering shaft by the rotation preventing means for making the two non-rotatable and the locking means for locking the both non-detachable. Since it can be maintained in a state that does not hinder steering, there is an effect that safety during steering can be secured even if the steering wheel can be separated.

It is a side view of the work vehicle (crane work vehicle) which can apply the steering device of this-application Example. FIG. 2 is a perspective view of a driver's cab in the work vehicle of FIG. 1. It is a longitudinal cross-sectional view of the steering apparatus of 1st Example of this application. It is IV-IV expanded sectional drawing of FIG. It is VV expanded sectional drawing of FIG. FIG. 4 is a longitudinal sectional view of a state in which a steering handle in the steering device of FIG. 3 is separated from a steering shaft. It is a perspective view in the state where the steering handle in the steering device of the 2nd example of this application was separated from the steering shaft. FIG. 8 is a side view of a state in which a steering handle in the steering device of FIG. 7 is coupled to a steering shaft. It is IX-IX expanded sectional drawing of FIG. It is XX expanded sectional drawing of FIG.

  The steering device of the embodiment of the present application will be described with reference to the accompanying drawings. FIGS. 1 to 2 show a working vehicle (a crane working vehicle in the illustrated example) that can employ the steering device of the present embodiment. FIG. 6 shows the steering device of the first embodiment of the present application, and FIGS. 7 to 10 show the steering device of the second embodiment of the present application.

  The construction of the crane work vehicle shown in FIG. 1 and FIG. 2 is the same as that described in the background section above, but the crane work vehicle has a swivel base 11 mounted on the vehicle body 1. A single cab 12 and a crane work machine 13 are provided. In addition, the crane working machine 13 hangs a load with a hook from the tip of the boom 14 so that the crane work can be performed.

  In the driver's cab 12, as shown in FIG. 2, a driver's seat 15, a steering handle 2 for steering a vehicle, and various equipment related to the work implement 13 (operation lever 16, work state display section 17, various operation switches 18, etc.) Is provided. The work state display unit 17 displays, for example, AML, and is installed at a position deviated to the left or right (left side in the illustrated example) when viewed from the driver's seat 15 in front of the steering wheel 2. Yes. The various operation switches 18 are used to perform various types of switching related to screen switching of the work state display unit 17 and control of the work machine, and are provided in the vicinity (lower position) of the work state display unit 17.

“First Example of FIGS. 3 to 6”
In the steering apparatus of the first embodiment shown in FIGS. 3 to 6, the steering handle 2 is detachably connected to the steering shaft 3.

  That is, in the first embodiment, the socket portion 20 is provided at the center portion of the steering handle 2, while the plug portion 30 is provided at the upper end portion of the steering shaft 3, so that the socket portion 20 on the steering handle 2 side is steered. The steering handle 2 can be detachably connected to the steering shaft 3 by being detachable from the plug portion 30 on the shaft 3 side.

  Specifically, the socket part 20 on the steering handle 2 side has a cylinder part 21 that is open at the bottom, and the plug part 30 on the steering shaft 3 side has an inside of the cylinder part 21 of the socket part 20. The fitting material 31 inserted in is provided. Then, as shown in FIG. 3, the steering handle 2 side socket portion 20 (cylinder portion 21) is externally fitted to the steering shaft 3 side plug portion 30 (fitting material 31) as shown in FIG. 2 can be coupled to the steering shaft 3, while the steering handle 2 can be separated from the steering shaft 3 as shown in FIG.

  Further, in the steering device of the first embodiment, the steering handle 2 and the steering shaft 3 can be made non-rotatable by the rotation preventing means 4 and the steering handle 2 cannot be detached from the steering shaft 3 by the locking means 5. It can be locked.

  As shown in FIGS. 3 and 4, the detent means 4 employed in the steering device of the first embodiment includes a plurality of portions (on the outer peripheral surface of the plug portion 30 (fitting material 31) on the steering shaft 3 side). .. Are provided on the inner peripheral surface of the socket part 20 (cylinder part 21) on the steering handle 2 side, and the respective convex parts 32, 32 of the fitting material 31 are provided at four places in the illustrated example. .. Are provided with recesses 22, 22. And this rotation prevention means 4 carries out uneven fitting of each recessed part 22,22 ... by the side of the socket part 20 (cylinder part 21), and convex part 32,32 ... by the side of the plug part 30 (fitting material 31). By doing so, the steering handle 2 is made non-rotatable relative to the steering shaft 3 (the rotational force of the steering handle 2 can be transmitted to the steering shaft 3 as it is).

  As shown in FIGS. 3, 5, and 6, the locking means 5 employed in the steering device of the first embodiment is vertically moved to a position closer to the upper portion of the steering shaft 3 (a position immediately below the fitting material 31). A pair of left and right lock members 51, 51 are arranged in a non-moving state, and the lock claws 52, 52 of the lock members 51, 51 are respectively engaged with the left and right locking holes 24, 24 provided in the cylindrical portion 21 of the socket portion 20. Can be engaged and disengaged. In the first embodiment, each locking hole 24, 24 of the cylindrical portion 21 corresponds to a lock receiver in the claims.

  The lock means 5 will be described in more detail. Each of the pair of left and right lock members 51, 51 is a vertically oriented plate material, a lock claw 52 protruding outward from the upper end portion of the plate material, and a position closer to the lower end of the plate material And a push button portion 53 protruding outward. The upper surface side of the lock claw 52 of each lock member 51, 51 is an inclined surface 52a (see FIG. 6) that is inclined downward.

  A container-shaped receiving material 34 that guides the lock members 51, 51 so as to be movable in the left / right / inside / outward direction is fixed to a position near the upper portion of the steering shaft 3. Guide holes 35, 35 are formed at opposite positions of the annular wall of the receiving member 34 so as to guide the push button portions 53, 53 of the lock members 51, 51 so as to be able to appear and retract.

  Each of the lock members 51 and 51 is arranged on the receiving member 34 in a state where each push button portion 53 protrudes outward from each guide hole 35 of the receiving member 34 as shown in FIG. At the same time, a spring 54 is interposed between the lock members 51 and 51 to urge the lock members 51 and 51 outward. When the lock members 51 and 51 are biased outward, the distance between the lock claws 52 and 52 is set to be substantially the same as the distance between the opposing side walls of the cylindrical portion 21 of the socket portion 20. doing.

  As shown in FIG. 3, the socket part 20 (cylinder part 21) is completely fitted into the plug part 30 (fitting material 31) on the steering shaft 3 side in the cylinder part 21 of the socket part 20 on the steering handle 2 side. In this state, locking holes 24 and 24 are provided at positions corresponding to the lock claws 52 and 52 of the lock members 51 and 51, respectively. In the first embodiment, the socket portion 20 can be engaged with each other at a position that is phased at an angle of 90 ° with respect to the plug portion 30, so that the lock claws 52 of the two lock members 51, 51 are engaged. If the locking holes 24 are provided at four positions with an angle of 90 ° with respect to the cylindrical portion 21 with respect to the plug portion 30, the locking claws 52 can be connected to the plug portion 30 at any angle. , 52 can correspond to the two locking holes 24, 24.

  An inclined surface 21a (FIG. 6) is formed at the lower end portion of the cylindrical portion 21 of the socket portion 20 so as to be inclined downward from the inner surface side. The inclined surface 21a at the lower end of the cylindrical portion 21 is provided on the upper surfaces of the lock claws 52, 52 of the lock members 51, 51 when the socket portion 20 is fitted to the plug portion 30 as will be described later. 52a and 52a (FIG. 6) collide with each other in an inclined state, and have a function of automatically moving the lock members 51 and 51 inward.

  As shown in FIGS. 3, 5, and 6, an extension portion 33 that extends downward to the corresponding height position is provided at the lower portion of the fitting material 31. Yes. The extending portion 33 has an outer diameter that is slightly slightly larger than the inner diameter of the cylindrical portion 21 of the socket portion 20, but the portion of the extending portion 33 to which both lock members 51, 51 correspond corresponds to the extension portion 33. Cut portions 33a and 33a are provided for sliding the lock members 51 and 51 inward (unlocking). The cut portions 33a and 33a serve as guides when the lock members 51 and 51 slide in and out.

  In the steering device of the first embodiment, the steering handle 2 is attached to and detached from the steering shaft 3 as follows.

  First, as shown in FIG. 6, in order to connect the steering handle 2 to the steering shaft 3 from the separated state, the socket portion 20 (cylinder portion 21) of the steering handle 2 is connected to the plug portion 30 (fitting material) of the steering shaft 3. 31), the concave portions 22 of the cylindrical portion 21 are aligned with the convex portions 32 of the fitting material 31 (the state shown in FIG. 4), and the entire steering handle 2 is pushed down in this state. Then, the lower end portion (inclined surface 21a) of the cylindrical portion 21 abuts against the inclined surfaces 52a and 52a (FIG. 6) of the lock claws 52 and 52 of the left and right lock members 51 and 51, whereby both lock members 51 are obtained. , 51 can be pushed inward against the urging force of the spring 54 (the outer ends of the lock claws 52, 52 are in contact with the inner surface of the cylindrical portion 21). When the steering handle 2 is further pushed down, the socket portion 20 is moved downward while the inner surface of the cylinder portion 21 is in sliding contact with the tips of the lock claws 52, 52 of the lock members 51, 51, and each locking hole of the cylinder portion 21 is moved. When 24 and 24 face each lock claw 52 and 52, each lock member 51 and 51 is pushed outside by the urging | biasing force of the spring 54, and each lock claw 52 and 52 is shown in FIG.3 and FIG.5. Are respectively locked in the locking holes 24, 24 of the cylindrical portion 21. In this state, the push button portions 53 and 53 of the lock members 51 and 51 protrude outward from the outer peripheral surface of the receiving member 34, respectively.

  3 and 5, the steering handle 2 rotates relative to the steering shaft 3 by the anti-rotation means 4 (concave engagement between the concave portion 22 on the socket portion 20 side and the convex portion 32 on the plug portion 30 side). The rotational force of the steering handle 2 is transmitted to the steering shaft 3 as it is, and the locking means 5 (engagement between both lock members 51 and 51 and the respective locking holes 24 and 24 of the cylinder portion 21). This prevents the steering handle 2 from being inadvertently separated from the steering shaft 3.

  In order to separate the steering handle 2 from the connected state of the steering handle 2 (the state shown in FIG. 3), the push buttons 53 and 53 of the lock members 51 and 51 are pushed inward, respectively. Is inwardly unlocked from the respective locking holes 24, 24 of the cylindrical portion 21, and is brought into the unlocked state. The steering handle 2 is pulled up while maintaining the unlocked state, so that the steering handle 2 as shown in FIG. Can be separated from the steering shaft 3.

  The steering device according to the first embodiment of the present application is installed in the work vehicle (crane work vehicle) shown in FIGS. 1 and 2, but when steering is required during vehicle travel, the steering handle 2 is steered as shown in FIG. It is attached (connected) to the shaft 3.

  On the other hand, when the work machine (crane work machine) 13 is operated, the steering handle 2 is unnecessary, so that the steering handle 2 can be separated from the steering shaft 3 as shown in FIG. The work machine 13 can perform work even when the steering handle 2 is mounted on the steering shaft 3. However, when the vehicle is not required to travel, if the steering handle 2 is separated in FIGS. An effect is obtained.

  1stly, since the part which the steering handle 2 occupied becomes a space part (surplus space), boarding / alighting to the driver's seat 15 becomes easy.

  Second, since the field of view from the driver's seat 15 blocked by the steering handle 2 is widened, for example, the visibility to the work state display unit 17 is improved when the work machine 13 is working, and the work state display unit 17 It becomes easy to operate various operation switches 18 in the vicinity.

  Third, by separating the steering handle 2, the steering handle 2 can be stored in an invisible place. In this case, the work vehicle is stolen because there is no steering handle 2 (the work vehicle cannot be steered). It will not be done.

  When the steering handle 2 is separated from the steering shaft 3, it is clear that the work vehicle cannot be steered, and it is obvious whether the work vehicle is in an anti-theft state.

  In the steering device of the first embodiment, when the steering handle 2 is connected to the steering shaft 3, the steering handle is provided by the rotation preventing means 4 for making the two non-rotatable and the lock means 5 for making the both non-detachable. Since 2 is connected to the steering shaft 3 in a state that does not interfere with steering, safety during steering can be ensured even if the steering handle 2 can be separated.

“Second Embodiment of FIGS. 7 to 10”
The steering device of the second embodiment shown in FIGS. 7 to 10 has the following configuration in order to attach / detach and lock the steering handle 2 to / from the steering shaft 3.

  In the steering device of the second embodiment, the connecting member 6 is attached to the lower surface of the base plate 60 at the center of the steering handle 2, while the connecting member 6 is held and locked on the upper end 3a of the steering shaft 3. The connection receiving material 7 for doing is attached.

  The connecting member 6 on the steering handle 2 side is fitted with a fitting frame 61 having a U-shape in plan view fixed to the base plate 60, an engaging shaft 62 provided at a position near the base of the fitting frame 61, A swinging frame 64 having a U-shape in plan view pivotally supported by the engagement shaft 62 on the outside of the frame 61, lock balls 56 and 56 provided on both side frame portions 61a and 61a of the fitting frame 61, and swinging A lock pin 66 for locking the frame 64 to the fitting frame 61 is provided.

  The connection receiving member 7 on the steering shaft 3 side has a projection base 71 having a rectangular shape in plan view and a predetermined small height. A side-facing shaft locking groove 72 is provided on one surface of the projection base 71 (a surface facing the driver's seat), while concave ball receiving portions 73 and 73 are provided on the opposing side surfaces of the projection base 71, respectively. Is provided.

  In the steering device of the second embodiment, as will be described in detail later, the fitting frame 61 and the engagement shaft 62 on the steering handle 2 side and the protrusion base 71 on the steering shaft 3 side are within the scope of the claims. The anti-rotation means 4 is configured, and the rocking frame 64 and both lock balls 56 and 56 on the steering handle 2 side and both ball receiving portions 73 and 73 on the steering shaft 3 side are included in the lock in the claims. Means 5 are configured.

  First, the configuration related to the detent means 4 in the steering device of the second embodiment will be described. The detent means 4 includes a fitting frame 61 and an engagement shaft 62 on the connecting member 6 side, and a connection receiving material 7. The side protrusion 71 is the main component.

  The fitting frame 61 of the connecting member 6 has a U-shaped shape in which the tip ends of a pair of side frame portions 61a and 61a are connected by a front frame portion 61b as shown in an enlarged view in FIG. It is fixed to the lower surface of the base plate 60 at the center. In addition, an engagement shaft 62 is installed across the both side frame portions 61a and 61a at a position closer to the base side of the fitting frame 61 (a position closer to the right side in FIG. 9). A rectangular space is formed inside the portion surrounded by the U-shaped fitting frame 61 and the engagement shaft 62. In the second embodiment, the space surrounded by the fitting frame 61 and the engagement shaft 62 corresponds to the recess of the rotation preventing means 4 in the claims.

  The projection base 71 of the connection receiving member 7 has a rectangular shape in plan view and has a slightly smaller area than the space surrounded by the fitting frame 61 and the engagement shaft 62, and the upper end of the steering shaft 3. It is being fixed to the upper surface of the part 3a. A lateral shaft locking groove 72 for locking the engagement shaft 62 on the connecting member 6 side is provided on one surface of the projection base 71 (surface facing the driver's seat). In the second embodiment, the projection base 71 corresponds to the convex portion of the rotation preventing means 4 in the claims.

  In order to connect the steering handle 2 to the steering shaft 3 in the steering apparatus according to the second embodiment, the steering handle 2 is connected to the steering handle 2 on the steering handle 2 side in the vertical orientation shown by the solid line in FIG. The engagement shaft 62 is engaged with the shaft locking groove 72 of the coupling receiving member 7 on the steering shaft 3 side (the steering handle is in the state of 2 'in FIGS. 7 and 8), and then the shaft locking is performed. The entire steering handle 2 is tilted to the posture orthogonal to the steering shaft 3 with the groove 72 as the center (the steering handle is in the state of 2 ″ in FIGS. 7 and 8). In this state, as shown in FIG. Further, the fitting frame 61 on the side of the connecting member 6 and the engaging shaft 62 surround the vicinity of the outer periphery of the projection base 71 on the side of the receiving member 7, and therefore the steering. The connecting member 6 on the handle 2 side cannot be rotated horizontally with respect to the connecting receiving member 7 on the steering shaft 3. That is, the fitting frame 61, the engaging shaft 62, and the protruding base 71 are used to claim the present application. The detent means 4 in the range is configured.

  Next, the configuration related to the locking means 5 in the steering apparatus of the second embodiment will be described. The locking means 5 includes the swing frame 64 and the lock balls 56 and 56 on the connecting member 6 side, and the connection receiving material 7. The ball receivers 73, 73 provided on the side protrusion 71 are the main components. In the second embodiment, the lock balls 56, 56 on the connecting member 6 side correspond to the lock members of the lock means 5 in the claims, and the ball receivers 73, 73 provided on the projection base 71 are provided. This corresponds to the lock receiving of the lock means 5 in the claims.

  As shown in FIG. 9 and FIG. 10, holding holes 63 and 63 for holding the lock balls 56 and 56 are provided in the side frame portions 61 a and 61 a of the fitting frame 61 of the connecting member 6 at positions close to the tip portions thereof. The holding balls 63 and 63 hold the lock balls 56 and 56 movably in the side frame thickness direction, respectively. The lock ball 56 is prevented from coming out to the inner side of the holding hole 63.

  On the opposite side surface of the projection base 71 of the connection receiving material 7, a ball having a concave shape at a position corresponding to each of the lock balls 56, 56 in a state where the fitting frame 61 of the connection member 6 is fitted to the projection base 71. Receiving 73 and 73 are provided.

  The swing frame 64 of the connecting member 6 swings up and down about the engagement shaft 62 as shown in FIG. 8, so that the lock balls 56 and 56 are moved as shown in FIGS. The inner surface of both side frame portions 64a and 64a of the swing frame 64 can be maintained in the locked position (shown by the solid line) or moved to the unlocked position (position 56 'shown by the chain line). A recess 64c for allowing the lock ball 56 to escape to the outside is provided in a part (lower end in FIG. 10). The swing frame 64 functions as follows.

  In the state where the connecting member 6 is connected to the connection receiving member 7 as shown in FIG. 8, the lock balls 56, 56 provided on the both side frame portions 61a, 61a of the fitting frame 61 as shown in FIGS. Are at positions corresponding to the ball receivers 73 and 73 on the connection receiving material 7 side, but when the swinging frame 64 is at the solid line illustrated position (horizontal posture position) in FIG. 8, as shown in FIG. 9 and FIG. Further, the lock balls 56 and 56 are pressed against the ball receivers 73 and 73 of the projection base 71 by the inner surfaces of the both side frame portions 64 a and 64 a of the swing frame 64. In this state, the inner surfaces of the side frame portions 64a and 64a of the swing frame 64 are in contact with the outer sides of the lock balls 56 and 56, respectively. , 73 is maintained in a locked state. Therefore, in this locked state, the connecting member 6 on the steering handle 2 side cannot be removed upward from the connecting receiving member 7 on the steering shaft 3 side.

  On the other hand, the swinging frame 64 is swung in an inclined state with the front side facing up as indicated by the chain line in FIG. 8 (reference numeral 64 ′) (the front side of the swinging frame 64 strikes the lower surface of the base plate 60. In addition, the position corresponding to the lock ball 56 in the both side frame portions 64a and 64a of the swing frame 64 moves upward, and the recess 64c is shown by a chain line (reference numeral 64c ', 64c '), it faces each of the lock balls 56, 56. In this state, the pressing force by the side frame portions 64a and 64a of the swing frame 64 against the lock balls 56 and 56 is released, so that the lock balls 56 and 56 are indicated by chain lines (reference numeral 56 '). The ball receiver 73 can be detached from the outside (becomes unlocked). Therefore, in this unlocked state, the steering handle 2 'can be separated from the steering shaft 3 after the steering handle 2 is changed from the horizontal posture of FIG.

  Even in the anti-rotation means 4 and the lock means 5 employed in the second embodiment, the steering handle 2 rotates relative to the steering shaft 3 or is inadvertently separated while the steering handle 2 is connected to the steering shaft 3. Never do.

  Further, in the second embodiment shown in FIGS. 7 to 10, the swing frame 64 cannot be swung inadvertently with respect to the fitting frame 61 in a state where the connection member 6 is locked to the connection receiving member 7. For this purpose, rocking lock means is provided. As clearly shown in FIG. 9, a lock pin 66 is used for this swing lock means, and the lock pin 66 passes through the front frame portion 64 b of the swing frame 64 and the front frame portion 61 b of the fitting frame 61. It can be removably inserted into the pin insertion hole 61c provided in the connector.

  The lock pin 66 is guided by a guide frame 65 provided on the outer surface of the front frame portion 64 b of the swing frame 64, and the lock pin 66 is locked in a locking direction (with a spring 67 provided in the guide frame 65 ( The pin tip portion 66a is biased in the direction in which the pin tip portion 66a is inserted into the pin insertion hole 61c. The lock pin 66 is pinned on the front end portion 61b of the fitting frame 61 by pinching the front end knob portion and pulling it outward as indicated by the chain line (reference numeral 66 ') in FIG. It can be extracted from the insertion hole 61c (unlocked), and the lock means 5 can be unlocked by swinging the swing frame 64 upward while maintaining the unlocked state.

  When the rocking lock means for locking the rocking frame 64 is provided in this way, the rocking frame 64 is inadvertently unlocked when the connecting member is locked to the connection receiving member 7 by the locking means 5. Therefore, the function of ensuring double safety together with the lock means 5 is obtained.

  The steering device of the second embodiment shown in FIGS. 7 to 10 can also be applied to the work vehicle shown in FIGS. When the steering handle 2 is separated from the steering shaft 3, various functions can be obtained as in the first embodiment.

  1 is a vehicle body, 2 is a steering handle, 3 is a steering shaft, 4 is a detent means, 5 is a lock means, 6 is a connection member, 7 is a connection receiving member, 12 is a cab, 13 is a work machine, and 15 is a driver's seat , 17 is a work state display section, 18 is various operation switches, 20 is a socket section, 21 is a cylinder section, 22 is a recess, 24 is a locking hole (lock receiving), 30 is a plug section, 31 is a fitting material, 32 Is a convex part, 51 is a lock member, 56 is a lock ball (lock member), 61 is a fitting frame, 64 is a swinging frame, 71 is a protrusion, and 73 is a ball receiver (lock receiver).

Claims (1)

In a working vehicle having a single cab and work implement mounted on the vehicle body, and further provided with a steering handle for steering the vehicle and various equipment related to the work implement in the cab.
The steering handle is detachably connected to the steering shaft,
Between the steering handle and the steering shaft, a rotation preventing means by concave / convex fitting of a concave portion and a convex portion for making the steering handle relatively unrotatable with respect to the steering shaft, and the steering handle to the steering shaft A lock member for locking the shaft so as not to be detached and a lock means by engagement with a lock receiver are provided, respectively.
A steering device for a work vehicle.

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