JP6371249B2 - Hand guide roller - Google Patents

Description

  The present invention relates to a hand guide roller used for compacting a road surface such as asphalt pavement.

  Among compaction machines that perform road surface compaction work using compaction wheels that also serve as running wheels, hand guide rollers are relatively small and lightweight non-boarding type vehicles that are compacted on sidewalks and narrow alleys. Widely used in work. Since this type of hand guide roller does not have a steering function on the rolling wheel, the base end of the steering rod is connected to the rear part of the traveling body, and the operator grips the tip of the steering rod facing backward and is operated left and right. By doing so, the course of the vehicle is changed.

  The steering rod extending greatly rearward from the traveling machine body becomes an obstacle when the vehicle is transported, for example. For this reason, for example, the hand guide roller of Patent Document 1 includes a tilting mechanism that can tilt the steering rod from a working position with the tip directed rearward to a retracted position with the tip directed upward, and the tilting is performed at the working position and the retracted position. A locking mechanism is provided to control the space, and space is saved by switching the steering rod to the retracted position during the above transportation.

  More specifically, the technique disclosed in Patent Document 1 is provided with a pair of left and right plates constituting the base end of the steering rod on the left and right sides of the bracket provided at the rear portion of the traveling machine body. Are pivotally supported by a rotating pin to constitute a tilting mechanism. Further, as a locking mechanism, a stopper plate having an arc surface centering on the rotation pin is disposed on the bracket, and a cylinder is supported between the plates of the steering rod so as to correspond to the stopper plate. .

  A lock pin is slidably arranged in the cylinder, and the lock pin is urged toward the stopper plate by a spring, and also grips an operation grip provided at the base end and slides toward the anti-stop plate side. It has become possible to let you. The tip of the lock pin contacts the rear end of the stopper plate at the steering rod working position, contacts the front end of the stopper plate at the steering rod retracted position, and restricts the tilting of the steering rod at the operating position and retracted position, respectively. It comes to hold.

JP 2014-163087 A

  Generally, an operation box is provided at the tip of the steering rod of the hand guide roller, and this operation box has various functional parts for operating the hand guide roller, such as a forward / reverse lever, an accelerator lever, a steering handle, switches, warning lights, etc. Has a considerable weight. Since the steering rod needs to have a certain length and strength for changing the course of the vehicle during work, the steering rod itself has a considerable weight, and a heavy operation box is provided at the tip. These weights are concentrated in a tilting mechanism that pivotally supports the steering rod so as to be tiltable and a lock mechanism that regulates the tilting. Moreover, although it is compact and lightweight among rolling machines, a large force is required to change the course of the hand guide roller reaching its own weight of about 500 kg, and its operating force is concentrated on the tilting mechanism and the locking mechanism.

  Due to the above factors, the tilt mechanism and the lock mechanism are required to have high rigidity. In the tilting mechanism of the hand guide roller of Patent Document 1, the bracket and the left and right plates are pivotally supported by a rotating pin, and both ends of the rotating pin are engaged with the left and right plates. For this, only the central part in the left-right direction of the rotating pin is engaged. Therefore, in order to improve the rigidity of this portion, for example, measures such as greatly increasing the thickness in the left-right direction of the bracket are required, which causes an increase in weight.

  Further, since the lock mechanism regulates the tilt of the steering rod by bringing the tip of the lock pin into contact with the front and rear ends of the stopper plate, the lock pin at this time is a stopper plate that acts on the tip while being cantilevered. It will resist the power from. For this reason, it is necessary to improve the rigidity of the lock pin itself and the support member that supports the lock pin from the side of the steering rod, which also causes an increase in weight.

  On the other hand, the control cable extended from the forward / reverse lever and accelerator lever of the operation box and the wire harness extended from the switches and warning lights are connected to the hydraulic circuit, engine or electrical equipment mounted on the traveling aircraft. Connected. For this purpose, it is necessary to lay these cables and harnesses while avoiding the tilting mechanism and the locking mechanism provided at the connection point between the traveling machine body and the steering rod.

  However, in the technique of Patent Document 1, since the bracket of the tilting mechanism is located at the center in the left-right direction of the traveling machine body and the stopper plate of the locking mechanism is located at the center in the left-right direction, the cable harness Such a construction route is obstructed. As a result, cables and harnesses were erected in a state of being largely bent to prevent interference, and protruded to the outside, and could be damaged by contact with obstacles during work or when the steering rod was retracted .

  The present invention has been made to solve such problems, and the object of the present invention is to provide a mechanically efficient tilt mechanism that pivotally supports the steering rod and a lock mechanism that regulates the tilt. Well-structured, it is possible to secure sufficient rigidity while suppressing an increase in weight. In addition, cables and harnesses can be installed without being bent greatly at these tilting mechanism and locking mechanism, causing troubles during work. An object of the present invention is to provide a hand guide roller capable of preventing damage due to contact with an object.

In order to achieve the above object, the hand guide roller of the present invention has a traveling machine body including a pair of front and rear rolling wheels that are rotationally driven by a traveling power source and a rear part of the traveling machine body that is spaced apart in the left-right direction. The base end is composed of a pair of fixed bearing plates arranged side by side and a pair of movable bearing plates spaced apart in the left-right direction, and each movable bearing plate is placed on each stationary bearing plate of the traveling machine body and arranged horizontally. A steering rod that is pivotally supported by a single rotating pin and tiltable between two positions: a working position with the tip directed rearward and a retracted position with the tip directed upward, with the rotating pin as a center; A lock pin that is arranged so as to be bridged between a pair of movable bearing plates of the heel and is slidable between two positions of a lock position close to the rotation pin and an unlocked position separated from the rotation pin; The lock pin is formed on each of the fixed bearing plates. When the lock pin is in the unlocked position, the lock pin is allowed to move in a circular arc around the rotation pin as the steering rod is tilted. A lock portion for restricting the movement of the lock pin accompanying tilting and holding the steering rod at the working position and the retracted position, respectively , and the rotating pin penetrates the left and right fixed bearing plates and the movable bearing plate respectively. Both ends are protruded, the left and right protruding portions of the rotation pin are inserted into the bearing holes of the spring holder, the torsion spring is wound around each spring holder, and one end is engaged with the traveling machine body, The other end is engaged with the steering rod, and the steering rod is urged toward the retracted position. Screw portions are formed on the left and right ends of the rotation pin, and a double nut is screwed together. Characterized in that a result, the withdrawal from the spring holder of the torsion spring is prevented through the retainer by the double nut, the threaded portion of the left and right ends of the pivot pins, are formed so as to extend to the bearing hole of each spring holder And

  According to the hand guide roller of the present invention, the left and right ends of the rotation pin are pivotally supported by the pair of left and right fixed bearing plates on the traveling machine body side, and are pivotally supported by the pair of left and right movable bearing plates on the steering rod side. The position relationship of both ends is also given. Further, the left and right ends of the lock pin are inserted into the elongated holes of the pair of left and right movable bearing plates on the steering rod side, and the storage side stopper edge 39c and the work side stopper edge 39b of the pair of left and right fixed bearing plates on the traveling machine body side. It is designed to be selectively engaged, so that both sides are in a positional relationship. Therefore, these mechanisms can be configured dynamically and efficiently, and sufficient rigidity can be ensured while suppressing an increase in weight.

  Furthermore, a space is formed between a pair of left and right fixed and movable bearing plates that are spaced apart from each other, and by using this space, a member such as a control cable, a wire harness, or the like from the steering rod is not largely bent and the vehicle body side is formed. I can guide you. Therefore, since the protrusion of these members to the outside can be prevented, damage due to contact with obstacles during work can be prevented and reliability can be improved.

It is a side view which shows the hand guide roller of embodiment. It is a side view which shows a tilting mechanism and a locking mechanism when a steering rod is made into a work position. It is a top view which shows the tilting mechanism and lock mechanism when a steering rod is made into a work position. It is a bottom view which shows a tilting mechanism and a lock mechanism when a steering rod is made into a work position. FIG. 5 is a cross-sectional view corresponding to FIG. 4 illustrating a configuration of a tilting mechanism when a steering rod is used as a work position. It is a side view showing a tilting mechanism and a lock mechanism when the steering rod is in the retracted position. It is a side view which shows a tilting mechanism and a locking mechanism when a steering rod is in the middle of tilting. It is a perspective view which shows a tilting mechanism and a locking mechanism when a steering rod is made into a work position. It is A arrow directional view of FIG. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is explanatory drawing which shows the state before the assembly | attachment of a tilting mechanism. It is explanatory drawing which shows the state which connected the base end of the steering rod with the rotation pin. It is explanatory drawing which shows the state which assembled | attached the torsion spring. It is explanatory drawing which shows the state which completed assembly | attachment by screwing of a double nut. It is a top view which shows another example which reversed arrangement | positioning of a fixed bearing plate and a movable bearing plate. It is a side view which shows another example which inserted the end of the torsion spring in the latching hole of the movable bearing plate.

Hereinafter, an embodiment of a hand guide roller embodying the present invention will be described.
FIG. 1 is a side view showing a hand guide roller of the present embodiment. In the following description, the front / rear, left / right, and up / down directions are expressed with reference to the hand guide roller.

  The frame 3 of the traveling machine body 2 of the hand guide roller 1 (hereinafter sometimes referred to as a vehicle) is composed of an upper frame 3a and a lower frame 3b. The lower frame 3b is provided with a pair of front and rear rolling wheels 4 that also serve as running wheels. In the lower frame 3b, a hydraulic motor (not shown) for driving the rolling wheels 4 and the rolling wheel 4 are vibrated. A vibration device 5 or the like is mounted.

  Further, on the upper frame 3 a, a hydrostatic transmission (not shown) including an engine 6, auxiliary machinery 7, which is a driving power source, and a hydraulic pump that supplies hydraulic oil to the hydraulic motor by driving the engine 6. A hydraulic circuit (hereinafter referred to as HST), a watering tank 8, an HST oil tank 9, and the like are mounted. The water stored in the water spray tank 8 is used to prevent the pavement material from adhering to the outer peripheral surface of the rolling wheel 4 and to promote the cooling of the pavement material after the rolling, or after the rolling operation. It is used for watering the road.

  A base end of the steering rod 13 is connected to the rear portion of the upper frame 3a via a tilting mechanism 11 and a lock mechanism 12. Although details of these mechanisms 11 and 12 will be described later, the steering rod 13 is tilted by the tilting mechanism 11 so that the working position with the tip directed rearward (shown by a solid line in FIG. 1) and the retracted position with the tip directed upward (see FIG. 1 is indicated by an imaginary line), and the tilt is restricted by the lock mechanism 12 so as to be held at the working position and the storage position.

  An operation box 14 is provided at the tip of the steering rod 13, and the operation box 14 includes various functional parts for operating the hand guide roller 1, such as a forward / reverse lever 15, an accelerator lever 16, a steering handle 17, and switches 18. And warning lights 19 are provided. The steering rod 13 during the compaction work is switched to the work position, and the operator changes the course of the vehicle 1 by holding the steering handle 17 and operating it left and right. Further, when the vehicle 1 is transported, the steering rod 13 is switched to the storage position to save space.

  The steering rod 13 is provided with a heavy operation box 14 at its tip, and also plays a role of transmitting an operator's operation force when changing the course of the vehicle 1 to the traveling machine body 2. Is made to a certain length and inevitably has a considerable weight.

Next, the configuration of the tilt mechanism 11 and the lock mechanism 12 will be described sequentially.
2 is a side view showing the tilting mechanism 11 and the locking mechanism 12 when the steering rod 13 is in the working position, FIG. 3 is a plan view showing the tilting mechanism 11 and the locking mechanism 12 when the same is in the working position, and FIG. FIG. 5 is a bottom view showing the tilt mechanism 11 and the lock mechanism 12 in the same working position, FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing the configuration of the tilt mechanism 11 in the same working position, and FIG. It is a side view which shows the tilting mechanism 11 and the locking mechanism 12 when is set to the storage position.

  A pair of fixed bearing plates 22 are arranged and welded to the lower surface of the rear portion of the upper frame 3a of the traveling machine body 2 in a positional relationship spaced apart by a predetermined distance in the left-right direction. A round pipe 23 is disposed between the fixed bearing plates 22 in the horizontal direction, and both ends of the round pipe 23 are welded to the inner side surfaces (surfaces facing each other) of the left and right fixed bearing plates 22, respectively. Slide contact plates 24 are welded to the outer surfaces of the left and right fixed bearing plates 22 (the outer surfaces in the left and right direction) corresponding to the round pipes 23, respectively. Bearing holes 22 a and 24 a are provided so as to communicate with the inside of the round pipe 23.

  On the other hand, a movable bearing plate 25 is welded to each of the left and right side surfaces of the base end side of the square pipe 20 constituting the steering rod 13, and the base end of the steering rod 13 is configured by these movable bearing plates 25. The left and right movable bearing plates 25 are disposed on the outer sides of the fixed bearing plates 22 of the traveling machine body 2 in the left-right direction, and the inner surfaces of the movable bearing plates 25 are the outer surfaces of the fixed bearing plates 22 (more specifically, the outer surfaces of the sliding contact plates 24). Is superimposed.

  Spring holders 26 are disposed on the outer surfaces of both the movable bearing plates 25, respectively. These spring holders 26 are formed in a columnar shape extending in the left-right direction, and a hook-shaped portion on the inner end side is formed on the outer surface of the movable bearing plate 25. Welded. In the left and right movable bearing plates 25 and the spring holder 26, bearing holes 25a and 26a are provided so as to correspond to the bearing holes 22a of the fixed bearing plate 22. As a result, the fixed bearing plate 22 including the round pipe 23 is provided. The bearing hole 22a, the bearing hole 24a of the sliding contact plate 24, the bearing hole 25a of the movable bearing plate 25, and the bearing hole 26a of the spring holder 26 are continuous with each other in the horizontal direction. In these bearing holes 22 a, 24 a, 25 a, 26 a, rotating pins 27 arranged in the horizontal direction are inserted from the side, and the left and right ends of the rotating pins 27 are laterally extended from the bearing holes 26 a of the spring holder 26. A threaded portion 27a is formed so as to protrude from each other.

  Washer-like retainers 28 are fitted into the screw portions 27a at both the left and right ends of the rotation pin 27, and a double nut 29 is screwed into the screw portions 27a of the rotation pins 27 protruding from the left and right retainers 28. The retainer 28 is brought into contact with the outer end surface of the spring holder 26. Here, the screw portions 27a at both the left and right ends of the rotation pin 27 are formed so as to extend into the bearing holes 26a of the spring holder 26. As will be described later, the room for the screw portions 27a is fixed to the fixed bearing plate 22 and the movable bearing. This is used for adjusting the clearance with the plate 25.

  As described above, the pair of left and right movable bearing plates 25 are also pivotally supported via the rotation pins 27 with respect to the pair of left and right fixed bearing plates 22. As a result, the steering rod 13 has a base end connected to the rear portion of the traveling machine body 2 and can tilt between the working position shown in FIG. 2 and the retracted position shown in FIG.

  A torsion spring 30 is wound around the left and right spring holders 26, and the retainer 28 is in contact with the wound portion to prevent the torsion spring 30 from being detached from the spring holder 26. One ends 30a of the left and right torsion springs 30 are bent at right angles, and are respectively hooked on the edge of the movable bearing plate 25 of the steering rod 13 (the edge on the lower side at the work position shown in FIG. 2). Further, the other ends 30 b of the left and right torsion springs 30 are formed in a U shape and are fixed to the lower surface of the upper frame 3 a of the traveling machine body 2 by bolts 31, respectively. The left and right torsion springs 30 are set on the spring holder 26 in a state where the steering rod 13 is biased in a direction to tilt the steering rod 13 toward the storage position, and a preset load is applied so as to maintain a certain amount of biasing force even at the storage position. Is set.

The above is the configuration of the tilting mechanism 11, and the locking mechanism 12 will be described next.
FIG. 7 is a side view showing the tilt mechanism 11 and the lock mechanism 12 when the steering rod 13 is in the middle of tilting, and FIG. 8 is a perspective view showing the tilt mechanism 11 and the lock mechanism 12 when the steering rod 13 is in the working position. is there.

  As shown in FIGS. 2 and 6, the working side stopper piece 33 and the storage side stopper piece 34 are fixed to the outer surfaces of the left and right fixed bearing plates 22, respectively, and the front side of the storage side stopper piece 34 is adjacently buffered. Each rubber 35 is fixed. Further, the left and right movable bearing plates 25 of the steering rod 13 are extended to the opposite end side beyond the rotation pin 27, and the extended portions thereof serve as contact portions 25b.

  When the steering rod 13 is tilted to the work position, the left and right contact portions 25b are brought into contact with the left and right work-side stopper pieces 33, respectively, and further tilting is restricted. Further, when the steering rod 13 is tilted to the retracted position, the left and right abutting portions 25b are in contact with the left and right shock absorbing rubbers 35, respectively, and further tilting is performed by the retracting side stopper piece 34 via these shock absorbing rubbers 35. Be regulated.

  As shown in FIG. 8, the left and right movable bearing plates 25 of the steering rod 13 are respectively formed with long holes 36 extending in the contact / separation direction with respect to the rotation pin 27 (also the longitudinal direction of the steering rod 13). Between the left and right movable bearing plates 25, horizontal lock pins 37 are bridged, and both left and right ends of the lock pins 37 are respectively inserted into the long holes 36 and are prevented from being detached by bolts 38. Yes. The lock pin 37 slides in the contact and separation direction with respect to the rotation pin 27 while being guided by the long holes 36 at both left and right ends. A state where one stroke end has been reached is referred to as a lock position, and conversely, a state where the stroke end is moved away from the rotation pin 27 and the other stroke end of the long hole 36 has been reached is referred to as a non-lock position.

  The lock pin 37 has a circular cross section, and the stroke end portions of the left and right elongated holes 36 corresponding to the lock position and the non-lock position also have a circular shape corresponding to the outer peripheral surface of the lock pin 37, respectively. Further, at the stroke end on the lock position side of the left and right elongated holes 36, the escape portions 36a (FIGS. 2, 6, and 6) are formed so as to form a space between the outer peripheral surface of the lock pin 37 when in the lock position. 7) is expanded. These escape portions 36a may be inclined so as to descend outward in the left-right direction when the steering rod 13 is in the retracted position of the upright posture.

  On the other hand, the left and right fixed bearing plates 22 are respectively formed with lock portions 39 that bulge upward and obliquely forward. These lock portions 39 are formed on the sliding contact edge 39a having an arc shape around the rotation pin 27, the work side stopper edge 39b formed on the rear side of the sliding contact edge 39a, and the front side of the sliding contact edge 39a. It is comprised from the storage side stopper edge 39c. In the present embodiment, the lock portion 39 is integrally formed when the fixed bearing plate 22 is cut out from the steel plate. However, the present invention is not limited to this, and the lock portion 39 may be a separate part.

  The lock pin 37 described above moves while drawing an arc around the rotation pin 27 as the steering rod 13 tilts. As shown in FIG. 7, the lock pin 37 when in the unlocked position is retracted from the work side stopper edge 39b via the sliding contact edge 39a as the steering rod 13 is tilted without being blocked by the lock portion 39. It can freely move between the side stopper edge 39c. As shown in FIG. 2, when the lock pin 37 slides to the lock position in a state where the steering rod 13 is pivotally regulated by the work side stopper piece 33, the lock portion 39 is located behind the lock pin 37. The work side stopper edge 39b is positioned to prevent the lock pin 37 from moving to the storage side stopper edge 39c, and as a result, the tilting of the steering rod 13 to the storage position is restricted.

  In addition, as shown in FIG. 6, when the lock pin 37 is switched to the lock position in a state where the steering rod 13 is rotationally restricted by the storage side stopper piece 34 via the buffer rubber 35, The storage side stopper edge 39c of the lock portion 39 is positioned on the front side to prevent the lock pin 37 from moving to the work side stopper edge 39b. As a result, the tilting of the steering rod 13 to the work position is restricted. In this storage position, the storage-side stopper edge 39c is set so that the lock pin 37 cannot be slid to the lock position unless the buffer rubber 35 is slightly crushed. In order to prevent the lock pin 37 from being removed from the locked position, a protrusion 39d is formed on the upper portion of the storage side stopper edge 39c.

The configuration of the lock mechanism 12 has been described above. In the present embodiment, the remote control mechanism 41 is attached to the steering rod 13 so that the operator can remotely control the lock mechanism 12 at hand. 41 will be described.
FIG. 9 is a view taken in the direction of arrow A in FIG. 8, and FIG. 10 is a cross-sectional view taken along line XX in FIG.

  As shown in FIGS. 8 to 10, an operating rod 42 is disposed on the steering rod 13 along the longitudinal direction thereof, and a screw portion 42 a is formed at the base end of the operating rod 42. The screw portion 42a of the operating rod 42 is inserted into a screw hole 37a penetrating the central portion in the left-right direction of the lock pin 37 after the washer 43 is fitted, and the double nut 44 is inserted into the screw portion 42a on the opposite side. It is screwed. The inner diameter of the screw hole 37a of the lock pin 37 is set slightly larger than the outer diameter of the screw portion 42a of the operation rod 42, and the double nut 44 does not tighten the lock pin 37 between the washer 43 and the operation rod 42. The screw portion 42a is screwed with a margin in the longitudinal direction. As a result, the base end of the operation rod 42 is connected to the lock pin 37 so as to be rotatable about the axis.

  The operation rod 42 extends to the front end side on the steering rod 13, and the operation knob 45 is provided by bending the front end of the operation rod 42 at a substantially right angle. A plate-like guide bracket 46 is welded at a position slightly closer to the base end side than the operation knob 45 on the steering rod 13, and a guide plate 47 (made of elastic urethane (elastic material)) is formed on the guide bracket 46. Guide members) are stacked, and the left and right sides thereof are fixed to the guide bracket 46 by bolts 48 and nuts 49. A guide hole 47a is provided in the guide plate 47, and a notch 46a is formed in the guide bracket 46 so as to correspond to the guide hole 47a.

  The guide bracket 46 is prevented from direct contact with the operation rod 42 by the formation of the notch 46 a, while the operation rod 42 is inserted into the guide hole 47 a of the guide plate 47. The inner diameter of the guide hole 47a is set slightly larger than the outer diameter of the operation rod 42, and the guide hole 47a guides the movement of the operation rod 42 in the axial direction. The material of the guide plate 47 is not limited to urethane, and can be arbitrarily changed as long as it has elasticity.

  A washer 50 is fixed to the operation rod 42 at a position closer to the base end side than the insertion position of the operation rod 42 into the guide hole 47a. A compression spring 51 (biasing means) is wound around the operation rod 42 between the washer 50 and the guide bracket 46, and the operation rod 42 is attached toward the proximal end side of the steering rod 13 by the compression spring 51. As a result, the lock pin 37 is urged toward the lock position via the operation rod 42.

  As described above, the operating rod 42 is guided by the guide hole 47a and connected to the lock pin 37, but can be rotated around the axis without being restricted by the members 47a and 30. As the operation rod 42 is rotated, the operation knob 45 is rotated by about 90 ° left and right from an arbitrary direction orthogonal to the axis of the operation rod 42 (specifically, from an upright posture on the steering rod 13. Within the specified range). Even if the operation knob 45 is oriented in any direction, if the operation knob 45 is pulled toward the distal end against the urging force of the compression spring 51, the operation knob 45 is locked via the operation rod 42. The pin 37 is switched from the locked position to the unlocked position.

  On the other hand, a control cable extending from the forward / reverse lever 15 and the accelerator lever 16 of the operation box 14 and a wire harness extending from switches and warning lights (hereinafter collectively referred to as a cable / harness 52, 4) is drawn from the square pipe 20 of the steering rod 13 through the tilt mechanism 11 and the lock mechanism 12 to the traveling machine body 2 side, and then the hydraulic circuit or engine 6 mounted on the traveling machine body 2 or Connected to electrical equipment.

  In the present embodiment, a pair of fixed bearing plates 22 on the traveling machine body 2 side are arranged apart from each other in the left-right direction, and the movable bearing plate 25 on the steering rod 13 side is overlapped on the outer side in the left-right direction of these fixed bearing plates 22. Yes. For this reason, a space S is formed between the left and right fixed bearing plates 22, and the square pipe 20 side and the traveling machine body 2 side of the steering rod 13 communicate with each other through the space S. In this space S, only one round pipe 23 through which the rotation pin 27 is inserted is disposed horizontally, so that the cables / harnesses 52 run through the space S without being greatly bent. Guided to the airframe 2 side.

Next, the assembly procedure of the tilt mechanism 11 will be described.
11 is an explanatory view showing a state before the tilting mechanism 11 is assembled, FIG. 12 is an explanatory view showing a state in which the proximal end of the steering rod 13 is connected by the rotation pin 27, and FIG. 13 is a state in which the torsion spring 30 is assembled. FIG. 14 is an explanatory view showing a state in which the assembly is completed by the screwing of the double nut 29.

  As shown in FIG. 11, a round pipe 23 and a sliding contact plate 24 are welded to the left and right fixed bearing plates 22 of the traveling machine body 2 in advance, and work side and storage side stopper pieces 33 and 34, a buffer rubber 35, and Is fixed. A spring holder 26 is welded to the left and right movable bearing plates 25 of the steering rod 13 in advance.

  First, after gripping the steering rod 13, as shown in FIG. 12, the left and right movable bearing plates 25 are arranged so as to overlap the left and right fixed bearing plates 22 of the traveling machine body 2, and both bearing holes are provided. 22a and 25a are matched. Then, the rotation pin 27 is inserted from the side through the bearing hole 26 a of one spring holder 26, and the screw portions 27 a at the left and right ends of the rotation pin 27 are projected from the bearing holes 26 a of the left and right spring holders 26.

  Next, as shown in FIG. 13, the torsion spring 30 is fitted into the left and right spring holders 26, one end 30a bent at a right angle is hooked to the edge of the movable bearing plate 25 of the steering rod 13, and the other end 30b travels. It is fixed to the lower surface of the upper frame 3 a of the machine body 2 with bolts 31. At this time, a predetermined preset load is applied to the torsion spring 30, and the urging force of the torsion spring 30 is applied even at the retracted position of the steering rod 13.

  After that, as shown in FIG. 14, the retainers 28 are fitted into the screw portions 27 a of the rotation pins 27 protruding from the left and right spring holders 26, and the double nut 29 is screwed. The tightening force of the double nut 29 at this time is such that the retainer 28 is brought into contact with the outer end surface of the spring holder 26. This completes the assembly of the tilting mechanism 11.

  The hand guide roller 1 according to the present embodiment is configured as described above. Next, the effects achieved by the tilt mechanism 11 and the lock mechanism 12 will be described in comparison with the technique of Patent Document 1.

  In the present embodiment, the left and right ends of the rotation pin 27 constituting the tilting mechanism 11 are pivotally supported by the pair of left and right fixed bearing plates 22 on the traveling machine body 2 side, and on the pair of left and right movable bearing plates 25 on the steering rod 13 side. It is pivotally supported and has a both-sided positional relationship with respect to either side. In the technique of Patent Document 1, the rotation pin only engages the central portion in the left-right direction with respect to the bracket on the traveling machine body side, but since it has a mechanically advantageous structure compared to this, Sufficient rigidity can be secured while suppressing unnecessary weight increase.

  Further, in this embodiment, the left and right ends of the lock pin 37 constituting the lock mechanism 12 are inserted into the long holes 36 of the pair of left and right movable bearing plates 25 on the steering rod 13 side, and the storage side stopper edge on the traveling machine body 2 side. 39c and the work side stopper edge 39b are selectively engaged, and both sides are in a positional relationship. In the technique of Patent Document 1, the tip of the lock pin that is cantilevered is brought into contact with the front end and the rear end of the stopper plate. Sufficient rigidity can be ensured while suppressing the increase.

  On the other hand, in the present embodiment, a pair of left and right fixed and movable bearing plates 22 and 25 are spaced apart and a space S formed between them is used to increase the size of the cable / harness 52 from the operation box 14. It is guided to the traveling machine body 2 side without being bent. In the technique of Patent Document 1, it is necessary to largely bend cables and harnesses in order to prevent interference with the bracket of the tilting mechanism and the stopper plate of the locking mechanism, and as a result, the cables and harnesses that protrude to the outside are in operation. Although there was a possibility of damage due to contact with an obstacle, such a situation can be prevented according to the present embodiment. Therefore, reliable operation of the hand guide roller 1 can be ensured and reliability can be improved.

On the other hand, the hand guide roller 1 of the present embodiment is switched between the work position and the storage position of the steering rod 13 according to the procedure described below.
As described above, when the steering rod 13 is in the retracted position shown in FIG. 6, the left and right contact portions 25b are in contact with the left and right storage-side stopper pieces 34 via the buffer rubber 35, and the lock pin 37 is in contact with the left and right. The tilting is restricted by the engagement with the storage side stopper edge 39c.

  When the operation knob 45 of the operation rod 42 is gripped and pulled forward (to the front end side of the steering rod 13), the lock pin 37 slides to the unlocked position against the urging force of the compression spring 51. As indicated by the arrow, the steering rod 13 can be tilted toward the work position. Even if the hand is released from the operation knob 45 during tilting, the lock pin 37 moves toward the work side stopper edge 39b while sliding on the sliding contact edge 39a of the left and right lock portions 39, and the tilting of the steering rod 13 is continued. can do.

  When the steering rod 13 tilts to the work position, the left and right contact portions 25b abut against the left and right work-side stopper pieces 33, and further tilting is restricted. At the same time, the lock pin 37 slides to the lock position by the urging force of the compression spring 51 and engages with the work side stopper edge 39b, so that the tilt to the retracted position is also restricted. As a result, the steering rod 13 is held at the work position. Is done.

  Further, when the operation knob 45 is again gripped and pulled forward at this working position, the lock pin 37 slides to the unlocked position, so that the steering rod 13 is directed to the retracted position as shown by the broken line arrow in FIG. Can be tilted. When the steering rod 13 is tilted to the retracted position, the left and right abutting portions 25b abut against the left and right retracting side stopper pieces 34 via the buffer rubber 35.

  When a force is applied to the tilting operation of the steering rod 13 so as to slightly crush the buffer rubber 35, the lock pin 37 slides to the lock position by its own weight and the urging force of the compression spring 51. At that time, the outer peripheral surface of the lock pin 37 collides with the stroke end of the long hole 36 and emits a collision sound such as “can!”, So that the steering rod 13 naturally locks in the retracted position without visual confirmation. Can be recognized.

  Further, the steering rod 13 in the retracted position receives a reaction force of the crushed shock absorbing rubber 35, and receives an urging force in a direction opposite to the reaction force from the torsion spring 30 set with a preset load. ing. For this reason, the steering rod 13 is held at the retracted position in a state where rattling in the tilting direction is prevented, and for example, generation of noise due to rattling during transportation of the vehicle 1 can be prevented.

  On the other hand, in order to tilt the steering rod 13 as described above, it is necessary to pull the operation knob 45 to slide the lock pin 37. The operation knob 45 is moved closer to the operator than the lock pin 37 by the remote operation mechanism 41. positioned. Specifically, the lock pin 37 is in the proximity of the rotation pin 27 that is the tilt center of the steering rod 13, but the operation rod 42 extends from the lock pin 37 toward the distal end side of the steering rod 13, and the operation rod An operation knob 45 is provided at the tip of 42. For this reason, for example, compared with the case where the operation knob 45 is provided integrally with the lock pin 37, the operation knob 45 is disposed at a position closer to the operator by an amount corresponding to the length of the operation rod 42.

  At this time, the operator pulls the operation knob 45 and, for example, tilts the heavy-duty steering rod 13 with the steering handle 17 or the operation box 14 as a clue, so that it is a troublesome work that requires an unreasonable posture. . However, when the operation knob 45 approaches the worker, the worker can reach the operation knob 45 only by reaching out or bending slightly, and can perform work in a more comfortable posture.

  In addition, since the directing direction of the operation knob 45 can be changed around the axis of the operation rod 42, the operator can arbitrarily adjust the operation knob 45 in the direction that is most easily operated according to the standing position with respect to the steering rod 13. Further, the steering rod 13 is always urged toward the storage position by the torsion spring 30, and the urging force acts in a direction to reduce the weight of the steering rod 13, so that an operator when tilting the steering rod 13 is operated. Can be greatly reduced. These points are also factors that facilitate the work.

  Further, in order to reduce the weight of the steering rod 13 as described above, a large urging force is required. Therefore, when the spring is enlarged, it is difficult to secure an appropriate installation place. The torsion spring 30 is more compact than the spring constant, and in the present embodiment, the torsion spring 30 is installed using a dead space that originally exists.

  More specifically, when the hand guide roller 1 is captured in a plan view, the steering rod 13 at the work position extends rearward from the traveling machine body 2 as shown in FIG. Corners are formed on both the left and right sides. These corners are dead spaces that are conventionally not used for anything, but in this embodiment, the torsion springs 30 are wound around the left and right sides of the rotation pin 27, so that the corners are inevitably placed on the left and right corners. A torsion spring 30 is arranged for each.

  Therefore, the torsion spring 30 can be installed without restricting the configuration of the tilt mechanism 11, the lock mechanism 12, and the like, and thereby the operational effect of the torsion spring 30 can be obtained. In addition, the positions of these corners are suitable for engaging both ends 30a and 30b of the torsion spring 30 with the traveling machine body 2 side and the steering rod 13 side, respectively, and work during compaction work Since it is also a position that can be easily visually recognized by a person, it is possible to avoid a collision with an obstacle during work without paying special attention, and it is convenient in terms of preventing the torsion spring 30 from being damaged.

  On the other hand, the operation rod 42 of the remote operation mechanism 41 is inserted into the guide hole 47a of the guide plate 47 and guided to move in the axial direction. However, vibration on a rough road, vibration of the vibration device, etc. Causes rattling. However, in this embodiment, since the guide plate 47 is made of urethane, noise caused by rattling can be suppressed.

  Further, as is well known, the hand guide roller 1 is used in a construction site where dust or the like is scattered, and the scattered dust is accumulated on the hand guide roller 1 and inside the long holes 36 of the left and right movable bearing plates 25 constituting the lock mechanism 12. Dust also enters and accumulates. When the steering rod 13 is tilted from the working position to the retracted position when the operation is completed, the dust in the long hole 36 moves to the escape portion 36a formed at the stroke end on the lock position side as the steering rod 13 stands upright, and escapes. It is discharged to the outside following the inclination of the portion 36a. The dust accumulated in the long hole 36 prevents the lock pin 37 from sliding to the locked position and softens the above-described collision sound for determining whether the steering rod 13 is locked at the retracted position. Can be prevented in advance.

  On the other hand, each time the steering rod 13 is rotated, the outer side surfaces of the left and right fixed bearing plates 22 (more specifically, the welded sliding contact plate 24) and the inner side surface of the movable bearing plate 25 are in sliding contact with each other. Wear increases clearance. As described above, since the screw portions 27a at the left and right ends of the rotation pin 27 extend into the bearing hole 26a of the spring holder 26, the double nut 29 is screwed deeper by using the space of the screw portion 27a. By increasing the tightening force of the double nut 29, the left and right movable bearing plates 25 are slightly bent in the approaching direction, and the enlarged clearance is reduced to a normal value. The expansion of the clearance causes a backlash when the steering rod 13 for changing the course of the vehicle 1 is operated and deteriorates the feeling of operation. However, the clearance is returned to a normal value to provide a good feeling of operation for a long time. Can be maintained over a period of time.

  This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above embodiment, the lock pin 37 can be slid by the operator by the remote operation mechanism 41 and the steering rod 13 is urged toward the storage position by the torsion spring 30. Alternatively, the torsion spring 30 may be omitted.

  Further, in the above embodiment, the left and right movable bearing plates 25 are disposed outside the left and right directions of the fixed bearing plates 22 of the traveling machine body 2, but on the contrary, as shown in FIG. 25 may be arranged inside each fixed bearing plate 22 in the left-right direction. Even in this case, it is possible to obtain the same effect as that of the above embodiment.

  In the above embodiment, one end 30a of the left and right torsion springs 30 is bent at a right angle and hooked to the edge of the movable bearing plate 25 of the steering rod 13, but this configuration can be variously changed. For example, as indicated by phantom lines in FIG. 4, one end 30 a of the torsion spring 30 facing each other on the edge of the movable bearing plate 25 may be connected by a pipe 61. Further, as shown in FIG. 16, latching holes 71 may be provided through the left and right movable bearing plates 25, and one end 30 a of the torsion spring 30 may be inserted into the latching holes 71.

2 traveling machine body 4 rolling wheel 6 engine (power source for traveling)
13 Steering rod 22 Fixed bearing plate 25 Movable bearing plate 26 Spring holder 26a Bearing hole 27 Turning pin 27a Screw part 28 Retainer 29 Double nut 30 Torsion spring 36 Long hole 36a Escape part 37 Lock pin 39 Lock part 42 Operation rod 45 Operation knob 47 Guide plate (guide member)
47a Guide hole 51 Compression spring (biasing means)

Claims (5)

A traveling machine body including a pair of front and rear rolling wheels that are rotationally driven by a traveling power source;
A pair of fixed bearing plates juxtaposed in the rear part of the traveling machine body in a positional relationship spaced apart in the left-right direction;
A base end is formed by a pair of movable bearing plates spaced apart in the left-right direction, and each movable bearing plate is superposed on each fixed bearing plate of the traveling machine body and is pivoted by a single rotating pin disposed in the horizontal direction. A steering rod that is supported and tiltable between two positions, a working position with the tip directed rearward about the pivot pin and a retracted position with the tip directed upward;
It is arranged so as to be bridged between a pair of movable bearing plates of the steering rod, and is slidable between two positions, a locked position approaching the pivot pin and an unlocked position spaced from the pivot pin. With a lock pin,
The lock pins are formed on the pair of fixed bearing plates, respectively. When the lock pin is in the unlocked position, the lock pin is allowed to move while drawing an arc around the rotation pin as the steering rod is tilted. A lock portion that restricts movement of the lock pin accompanying tilting of the steering rod and holds the steering rod at the working position and the retracted position, respectively .
The pivot pins pass through the left and right fixed bearing plates and the movable bearing plate, respectively, and project both left and right ends. The left and right projecting portions of the pivot pins are respectively inserted into the bearing holes of the spring holder, A torsion spring is wound around each of the spring holders, one end is engaged with the traveling machine body, the other end is engaged with the steering rod, and the steering rod is biased toward the retracted position,
Threaded portions are formed on both left and right ends of the pivot pin, and double nuts are screwed together, thereby preventing the torsion spring from being detached from the spring holder via the retainer by each double nut.
The hand guide roller according to claim 1 , wherein screw parts at both left and right ends of the rotation pin are formed so as to extend into the bearing holes of the spring holder . An operation rod having a proximal end coupled to the lock pin and extending toward the distal end side of the steering rod;
An urging means for urging the lock pin toward the lock position via the operation rod;
An operation knob is provided at a tip of the operation rod and can operate the lock pin to the unlocked position side against the urging force of the urging means via the operation rod. The hand guide roller according to claim 1. The proximal end of the operation rod is connected to the lock pin so as to be rotatable about an axis,
The operation knob is formed by bending the tip of the operation rod at a substantially right angle, and can be directed in an arbitrary direction substantially orthogonal to the axis as the operation rod rotates about the axis. The hand guide roller according to claim 2. The steering rod is provided with a guide member made of an elastic material,
4. The hand guide roller according to claim 2, wherein the operation rod is guided by being inserted into a guide hole penetrating the guide member at a position near the operation knob. The lock pin is inserted between the left and right ends of the long holes formed in the movable bearing plates of the steering rod, and slides between the locked position and the unlocked position while being guided by the long holes.
The stroke end on the lock position side of each of the long holes is provided with an extended relief portion so as to form a space with the outer peripheral surface of the lock pin when in the lock position. The hand guide roller according to any one of claims 1 to 4.

Images