JP4414919B2 - Retractable side stay - Google Patents

Description

  The present invention relates to a retractable side stay mainly used for mounting a side mirror in an industrial vehicle such as a truck or a construction machine.

  In general, in an industrial vehicle such as a truck or a construction machine, a side mirror is attached to the outside of the cab of the vehicle so as to extend to the outside of the vehicle body in order to improve the visibility of the rear and front and lower sides. The side mirror is supported by a stay provided so as to protrude relatively large outward from the vehicle body, unlike a passenger car. For this reason, the amount of overhang from the side of the vehicle body increases, so it is necessary to reduce the width of the vehicle when it is necessary to reduce the width of the vehicle, such as when storing in a garage other than during traveling, The mirror and its support member (stay) are retractable so that they can be stored along the side of the vehicle body. For such a side mirror support structure, various structures have been proposed and put into practical use (for example, Patent Documents 1 and 2). The support structure of these side mirrors is such that both ends of the side mirror support stays for attaching the mirrors to the brackets that are attached to the upper part and the middle part of the outer side of the vehicle body so as to protrude sideways are provided vertically. It is pivotally supported in the axial direction and is attached so as to be rotatable in the horizontal direction, and is supported so that it can be rotated between a use position on the outside of the vehicle body and a storage position on the side of the vehicle body. In some cases, the side mirror support stay can be driven and stored by an electric motor.

  Compared to the support structure of side mirrors in vehicles such as trucks and buses, in construction machinery vehicles such as hydraulic excavators, the structure of the cab is smaller than that of trucks and buses. The support structure which enlarges is not adopted. In general, the support stay of the side mirror is rarely attached directly to the outer surface of the cab of the vehicle body. For example, as shown in FIG. 8, the turning frame is supported by a lower traveling body (not shown). The base end of the support stay 50 is mounted by using a pipe handrail 33 provided along the outside of the front column 31 (front pillar) of the cab 30 mounted on the vehicle 35. In order to mount the base end of the support stay 50 on the vehicle side, a boss portion 51 provided at the base end of the support stay 50 is fixed to a mounting bracket 55 generally fixed to the pipe handrail 33. A bolt (not shown) is fastened.

  On the other hand, in the support structure of the side mirror, the side mirror support stay is expanded to the mirror use position and maintained in that position, and when the unexpected external force is received, the drive unit is prevented from being damaged. For the purpose, a rotation support part is provided to form irregularities on the rotation surface, a plurality of balls are arranged on one of the rotation surfaces, and concave and convex portions for receiving the balls are alternately arranged on the opposite rotation surfaces. A ball that is placed in a normal position by engaging the concave portion and the ball, and that allows the ball to ride on the convex portion on the opposite side (or vice versa) when subjected to an external force so that the ball can be displaced. It is known from Patent Document 3 or Patent Document 4, for example, that a latch mechanism is incorporated.

JP 2000-16180 A Japanese Patent Laid-Open No. 9-277875 JP-A-9-99780 JP 2001-213236 A

  By the way, for example, in a side mirror disposed beside the cab in a construction machine (specifically, a hydraulic excavator), as shown in FIG. 8, the front column 31 (front pillar) of the cab 30. Since the base end of the stay 50 is mounted by using the pipe handrail 33 located along the side of the vehicle, the side mirror 25 that projects greatly from the vehicle body when the construction machine vehicle is transported from the factory or base to the work site. Will interfere with transportation, so it will be necessary to store it on the vehicle body side. In order to store the side mirror 25, the bolt whose base end is fastened to the mounting bracket 55 is loosened and rotated, and the stay 50 is rotated by the bolt portion of the base end fastening. Therefore, when the vehicle is used at a work site, the side mirror 50 is returned from the storage position to the use position and fixed to restore the use state. Therefore, each time the construction machine vehicle is transported to the ground, the storing operation and the restoring operation must be performed, and the bolt loosening operation and the tightening operation are repeated at the fastening portion each time, which is troublesome. In addition, if the tightening is not performed sufficiently, there is a problem that the direction of the side mirror is out of order and the side mirror is damaged because it is accompanied by intense vibration during operation.

  In order to facilitate the storage of such a side mirror, a method such as that disclosed in Patent Documents 1 and 2 may be used. However, in a construction machine, a structure that can be attached to a pipe handrail as described above. Therefore, it has a cantilever structure, and there is a problem with stability. In addition, the latch structure may be adopted for positioning. However, in order to prevent the ball-shaped latch structure from rotating and displacing due to vibration or the like in the steady state, it is necessary to use the ball latch structure as described above. Requires pressing force. On the other hand, as shown in Patent Document 3 or Patent Document 4, the method of obtaining the pressing force by the coil spring inevitably has a problem that the support shaft portion becomes large in order to arrange the coil spring, which is not structurally preferable. is there.

  The present invention has been made in view of such circumstances, and is suitable for mainly supporting a side mirror having a structure that can be easily stored / deployed and at the same time can maintain a stable posture and can be miniaturized. The purpose is to provide a retractable side stay.

In order to achieve the above object, the retractable side stay according to the present invention comprises:
A mounting member whose base is attached to a support attached to the outer side of the driver's cab of the vehicle, a support stay of a required length to which a supported instrument is attached to the tip, and a body of the mounting member; A support member to which a base end of the support stay is attached, a pivot shaft connecting the support member and the mounting member so as to rotate the support member in contact with the body of the mounting member, and the pivot of the support member and a ball latch mechanism for restricting the rotation around the support shaft,
The ball latching mechanism, disc springs stacked as a pressing force generating member for applying a rotation restricting force of that is disposed around the pivot shaft, the overlapped disc spring is provided across the pivot shaft The pressing force is set and held by the locking pin fitted and mounted in the locking hole,
The mounting member is provided with a stopper at a predetermined angular position, and the rotation range of the support stay is restricted by the end of the locking pin being in contact with the stopper .

In the present invention, the heavy I disc spring, the the overlapped base portion Ru is positioned is caught in a recess provided in the support member or the mounting member is preferred.

The retractable side stay in the present invention can be used as a support stay for a side mirror, for example, at the outer side of the cab using a support body (for example, a handrail member) attached to the outer side of the vehicle. In this case, the support members of the support stays which are pivotally supported by the mounting member attached to the handrail member, protrudes the support stay in the vehicle width direction in the use position are restricting the rotation by a ball latching mechanism A supported device ( side mirror ) attached to the tip of the support stay can be held stably. When it is necessary to store the side mirror, if the support stay is pushed by hand and turned to the vehicle body side, the ball latch mechanism is forcibly released and can be moved to the storage position. Therefore, the support stay for this type of side mirror can be tilted without loosening the bolt fastening of the mounting portion as in the prior art, and has the advantage of facilitating the storing operation.

According to the present invention, the fixed holding function at a given position of the ball latching mechanism provided in the support portion of the support stay (pressing action force), since the superimposed dishes Ru obtained by a spring, a compact and the partial volume low together can Rukoto. Moreover, since a large pressing force can be obtained with a small amount of displacement in the axial direction, the holding function of the ball latch mechanism is improved, and the support stay can be held at a predetermined position even when an external force such as a large vibration is applied. It is effective when used for industrial vehicles that are subject to severe vibration during work. In addition, a stopper is provided on the mounting member side, and the rotation angle range of the support stay can be regulated by using a locking pin for setting the pressing force of the stacking disc spring, and combining them, and in a small space The fall function of the side stay can be demonstrated rationally.

In the present invention, the supporting support member or mounting member, by the arrangement position of the superimposed disc springs in a recess, or a built-in superposed disc springs moiety, or by the positioning of its base position, the protection of the disc spring A certain pressing force can be secured.

  Next, specific embodiments of the retractable side stay according to the present invention will be described with reference to the drawings. In the present embodiment, a side mirror support stay attached outside the cab of the vehicle will be described.

  FIG. 1 is a view showing an aspect in which a side mirror is attached to an outer side of a cab of a vehicle body in a retractable side stay according to a first embodiment of the present invention. 2 is an external perspective view of the main part of the retractable side stay according to the first embodiment, and FIG. 3 is an enlarged sectional view (a) of the main part, its AA view (b), and BB view. FIG. 4C is a plan view of FIG. 3, and FIG.

  As shown in FIG. 1, the retractable side stay 1 of the first embodiment is used as a support for a side mirror of a construction vehicle such as a hydraulic excavator. The retractable side stay 1 (hereinafter simply referred to as the side stay 1) has a mounting member 2 with a pipe handrail 33 attached to the outer surface along the front pillar 31 in the cab 30 of the vehicle as a support. A base end is attached to the support member 10 that is attached and supported rotatably on the mounting member 2, and a support stay 22 is provided sideways. And the side mirror 25 is attached to the front-end | tip of this support stay 22, and the driver | operator who sits in a driver's seat can visually recognize back.

  In the mounting member 2, the base 2 a is divided into a main body 3 and a presser piece 4 so that the pipe handrail 33 can be clamped and attached. At the center of the base portion 2a, mounting grooves 5 and 5 'for sandwiching the pipe handrail 33 between the main body 3 and the pressing piece 4 are formed, and required on both sides of the mounting grooves 5 and 5'. Bolt fastening portions 6 are provided apart from each other. The bolt fastening portion 6 is provided with a screw hole 6a on the main body 3 side and a bolt insertion hole 6b on the holding portion piece 4 side in a direction intersecting the direction of the mounting grooves 5 and 5 ', respectively. The attachment member 2 is attached to an appropriate position of the pipe handrail 33 by being fastened by the bolts 7 and 7 at the fastening portions 6 and 6.

  The main body 3 of the mounting member 2 has a required diameter on the upper surface with reference to a support member mounting axis O that is appropriately separated from the mounting position on the pipe handrail 33 and parallel to the mounting grooves 5, 5 '. A receiving hole 8 for a latch ball (steel ball) is provided by being divided into three equal parts on a circular shape to be drawn, and a concave portion 9 concentric with the axis O is formed on the back surface side. Further, a support hole 9a having a required diameter that communicates the recess 9 and the upper surface of the main body 3 is provided at the position of the axis O.

  The support member 10 is a cylindrical member, and is provided integrally with a pivot shaft 13 having a required length protruding downward from the center thereof. Further, as shown in FIG. 3C, ball receiving grooves 12 are formed radially on the lower surface 11 of the support member 10 by being divided into six equal parts. A mounting hole 14 for the support stay 22 is provided on the peripheral surface perpendicular to the axis O, and the base end is fitted and fixed in the mounting hole 14 so that the support stay 22 protrudes laterally. Has been. In addition, it is preferable that the projecting length of the pivot shaft 13 is set so as not to project from the lower surface of the mounting member 2 when the mounting member 2 and the support member 10 are combined. However, it is not limited to this.

  The support member 10 having such a structure is arranged on the main body 3 of the mounting member 2 by inserting the pivot shaft 13 attached integrally therewith into the support hole 9a, and a plurality of ball receiving grooves provided on the lower surface 11 thereof. 12 and the balls 15 supported by the three receiving holes 8 provided on the upper surface of the main body 3 of the mounting member 2 are engaged and supported.

  The pivot shaft 13 is assembled with a stacked disc spring 16 formed by combining a plurality of disc springs in the recess 9 of the main body 3 of the mounting member 2. Thus, the locking pin 18 is penetrated through the pin hole 17 formed so as to penetrate perpendicularly to the axis thereof, and the stacking plate spring 16 is assembled such that the axial pressing force is always urged. The pressing force by the stacking disc spring 16 is divided into three pieces interposed between the receiving hole 8 on the main body 2 and the receiving groove 12 on the support member 10 side via the pivot shaft 13 via the locking pin 18. The ball 15 is sandwiched from above and below and held steadily, and the support stay 22 protruding to the side is maintained at a predetermined position. The locking pin 18 for setting the stacking disc spring 16 can be inserted into the pin hole 17 of the pivot shaft 13 through a hole 19 that opens toward the axial center of the recess 9 on the side surface of the mounting member main body 2. ing. Further, a flat washer 21 is fitted on the bottom surface (ceiling surface) of the recess 9 so that the stacked disc spring 16 is stably supported, and the base end is received by the flat washer 21. . In this way, the support member 10 with the support stay 22 attached to the mounting member 2 engages the pivot shaft 13 with the engagement between the ball 15 supported by the receiving hole 8 and the receiving groove 12 on the support member side. It is supported by a ball latch mechanism 20 composed of a lap spring 16 that is biased via a stop pin 18. Reference numeral 23 in the figure is a stopper at a limit position when the support stay 22 is rotated, and is projected from the inner wall of the recess 9 so as to come into contact with the distal end portion of the locking pin 18 and restrict rotation. Yes.

  When the side mirror 25 is attached to the tip of the support stay 22 in the retractable side stay 1 configured as described above, the side mirror 25 protrudes from the use position (side of the cab). The support member 10 is constantly held by the pressing force of the stacking disc spring 16 in the ball latch mechanism 20 as described above, and can maintain a stable state. When it is necessary to store, when the support stay 22 is held and turned to the cab 30 side, the engagement between the ball 15 and the receiving groove 12 in the ball latch mechanism 20 is released, and the mounting member main body which is stationary The ball 15 is rotated against the pulling force (pressing force) by the overlapping plate spring 16 which is rotated while the ball 15 is held in the receiving hole 8 on the upper surface 2 and the lower surface 11 of the support member 10 acts on the pivot shaft 13. It is lifted up and turns as it is. When the flat portion on the lower surface 11 of the support member 10 rolls on the ball 15 and is displaced to a position corresponding to the next receiving groove 12, the ball 15 is engaged with the receiving groove 12 by the pulling force of the overlapping plate spring 16. The support member 10 is pulled down. At this time, if it has been rotated to a position corresponding to the storage position in advance, the rotation operation is stopped while the receiving groove 12 and the ball 15 are engaged. If it is not yet the storage position, it is further rotated to the next engagement position and stored.

  Thus, when the support stay 22 is rotated to the retracted position, the support member 10 is held by the ball latch mechanism 20 on the main body 3 of the mounting member 2 in the above-described manner and is not rotated to the next use position. The side mirror 25 and the side stay 1 that supports the side mirror 25 are securely held in the retracted position.

  In this embodiment, in order to maintain the engagement function of the support member 10 and the main body 3 of the mounting member 2 by the ball latch mechanism 20 described above, a large pressing force can be applied with a small amount of displacement by employing the stacking disc spring 16. Since it can be obtained and can be reduced in volume, it can be accommodated in a mounting member. Therefore, this type of side stay that is externally attached to the vehicle can be gathered in a compact manner and can be made to be retractable, so that it is effective for use in a vehicle that requires a storing operation.

  Next, the side stay of 2nd Embodiment is shown by FIGS. The second embodiment is the same as the previous embodiment in the basic configuration, but the configuration of the mounting member is different. Therefore, the same or similar components as those of the above-described embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  The side stay 1A of this embodiment is used to support the side mirror 25 of the vehicle as in the above-described embodiment, and is a pipe handrail 33 attached to the outer side (front pillar) of the cab 30. On the other hand, the support stay 22 of the side mirror 25 is attached to the top of the pipe handrail 33. Therefore, the mounting member 2 </ b> A is structured to be attached to the upper top portion of the pipe handrail 33.

  As shown in FIGS. 6 and 7, the mounting member 2A is pivotally supported on the front half of the main body 3a to be engaged and attached so as to straddle the bracket 34 on the top of the pipe handrail 33. The shaft 13A is planted upright. On the upper surface of the main body 3a, ball receiving holes 8 are provided which are divided into three equal parts on a circumference drawn with a required radius on the basis of the axis of the pivot shaft 13A, and a steel ball (ball 15) is provided in each receiving hole 8. ) Is arranged. The mounting structure of the mounting member 2A to the bracket 34 at the top of the pipe handrail 33 can be bolted up and down at a position corresponding to the mounting groove 2b that fits along the bracket 34 and the mounting hole 34a of the bracket 34. A mounting hole 2c is provided in the rear half, and is fastened to the bracket 34 by a bolt 37 and a nut 37 'so that the axis of the pivot shaft 13A of the main body 3a substantially coincides with the axis of the pipe handrail 33. It is a structure to be mounted. Further, a fixing member 38 is arranged in an intersecting direction so as to hold the bracket 34 from the lower surface at an intermediate position between the pipe handrail 33 and the fastening portion by the bolt 37, and both sides of the fixing member 38 and the main body 3a. The mounting portion 3b formed by overhanging is fastened with a bolt 39 to prevent lifting.

  On the other hand, the support member 10 for mounting the support stay 22 laterally at the base end is formed in a cylindrical shape, and a pivot shaft insertion hole 10a is formed through the shaft center in the vertical direction. On the lower surface, ball receiving grooves 12 that are radially divided into six equal to the above-described embodiment with respect to the axis of the pivot shaft 13A are disposed.

  The support member 10 formed in this way is pivotally supported by causing the upper surface of the mounting member main body 3a to correspond to the balls 15 respectively disposed in the three receiving holes 8 and the receiving grooves 12 on the lower surface of the support member 10. The insertion hole 10a is fitted to 13A and combined. The support member 10 abuts on the top surface thereof a lap spring 16 which is a combination of a plurality of disc springs fitted on a pivot shaft 13 projecting upward from the top surface thereof so that a required pressing force is urged. A ball latch mechanism 20 is formed by engaging a locking pin 18 through a locking hole 17 provided at the end of the pivot shaft 13A and engaging a ball 15 and a receiving groove 12 disposed in the receiving hole 8. Thus, it is configured to be held at a predetermined position by the pressing force of the overlapping disc spring 16 added via the pivot shaft 13A. The mounting portion of the stacked disc spring is covered with a cover 40 attached to the support member 10.

  The side stay 1A of the second embodiment configured as described above also has the same operational effects as described above. In addition, in the structure attached using the top part of the pipe handrail 33 in this way, by using the overlapping disc spring 16 as a pressing force generating member for securing the holding force in the ball latch mechanism 20 as in the present embodiment, Since it is low in bulk and can secure a strong pressure holding force with a slight displacement, the ball 15 used as a latch can be used in a minimum and small size, and it is small and effective with a small protruding dimension. A retractable side stay 1A can be obtained.

  As described above, according to the present invention, the horizontal rotation structure latch mechanism is interposed between the mounting member that attaches to the vehicle body side and the support member that is attached to the support stay and tilted when necessary. By using a countersunk spring to restrict thrust (pressing force) around the pivot shaft, it can be used effectively in a space-saving and powerful manner, so that the latch structure can be miniaturized overall. The effect that it can comprise low bulk is acquired.

  In accordance with the gist of the present invention, instead of the ball latch, a protrusion with improved sliding is formed equally on the mounting member side, or a ring member having a protrusion formed on a curved surface is fixedly disposed. It can be made to correspond. Further, it goes without saying that the side stay according to the present invention can be adopted as a support structure for equipment other than the side mirror.

The figure showing the aspect which attached the side mirror to the driver's cab outer part of the vehicle body in the retractable side stay by 1st Embodiment of this invention. 1 is a perspective view of the main part of the retractable side stay according to the first embodiment. Enlarged sectional view (a) of the main part and its AA view (b) and BB view (c) Plan view of FIG. The figure showing the aspect which attached the side mirror to the driver's cab outer part of the vehicle body in the retractable side stay of 2nd Embodiment. Partially cut front view of the retractable side stay of the second embodiment Plan view of FIG. The figure showing an example of the support structure of the side mirror in the conventional industrial vehicle

Explanation of symbols

1, 1A Side stay 2, 2A Mounting member 2b Mounting groove 3, 3a Body of mounting member 4 Presser piece 5, 5 'Mounting groove 8 Ball receiving hole 9 Recess 10 Support member 12 Ball receiving groove 13, 13A pivot Support shaft 15 Ball 16 Stack disc spring 18 Locking pin 20 Ball latch mechanism 22 Support stay 25 Side mirror 30 Driver's cab 33 Pipe handrail 34 Bracket

Claims (2)

A mounting member whose base is attached to a support attached to the outer side of the driver's cab of the vehicle, a support stay of a required length to which a supported instrument is attached to the tip, and a body of the mounting member; A support member to which a base end of the support stay is attached, a pivot shaft connecting the support member and the mounting member so as to rotate the support member in contact with the body of the mounting member, and the pivot of the support member and a ball latch mechanism for restricting the rotation around the support shaft,
The ball latching mechanism, disc springs stacked as a pressing force generating member for applying a rotation restricting force of that is disposed around the pivot shaft, the overlapped disc spring is provided across the pivot shaft The pressing force is set and held by the locking pin fitted and mounted in the locking hole,
The mounting member is provided with a stopper at a predetermined angular position, and a rotation range of the support stay is restricted by an end of the locking pin coming into contact with the stopper. . It said heavy I disc spring is retractable side stays according to claim 1 in which the overlapped base portion Ru is positioned is caught in a recess provided in the support member or the mounting member.

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