JP2010095185A - Mirror device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mirror device capable of effectively suppressing the vibration of a mirror. <P>SOLUTION: Both ends of a support arm 22 are rotatably connected to a handrail 19 to form a loop shape, and the mirror 23 is mounted to an intermediate part 22a of the support arm 22. That is, the mirror 23 is supported at both ends via the support arm 22. A support arm mounting tool 26 is rotatably mounted to one end of the support arm 22. The support arm mounting tool 26 is detachably attached to the upper end of the handrail 19. A clamp 27 is rotatably fitted into the handrail 19 at a side lower than the support arm mounting tool 26. A bracket 28 attached integrally with the other end of the support arm 22 is assembled in the clamp 27 so as to sandwich the clamp 27. The clamp 27 and the bracket 28 are fastened with a bolt 29 and a nut (not shown) screwed with the bolt 29. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mirror device provided in a cab.

As shown in FIG. 6, a mirror 2 attached to a cab 1 of a construction machine such as a hydraulic excavator is cantilevered from above by a stay 3 (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2006-182088 (page 4, FIG. 7-8)

  Due to the cantilevered support structure, the natural frequency is relatively low, and the mirror may resonate due to vibration during operation of the construction machine. In particular, there is a problem that the mirror is likely to vibrate due to shaking during traveling.

  The present invention has been made in view of these points, and an object of the present invention is to provide a mirror device that can effectively suppress mirror vibration.

  According to the first aspect of the present invention, there is provided a mirror mounting rod-like body provided on the cab, a support arm portion formed in a loop shape with both ends pivotably connected to the mirror mounting rod-like body, A mirror attached to the middle part of the support arm and supported at both ends via the support arm. At least one end of the support arm is pivotally fitted to the mirror mounting rod to adjust the clamping pressure. A mirror device connected to a possible clamp.

  According to a second aspect of the present invention, the mirror mounting rod-shaped body in the mirror device according to the first aspect is a handrail arranged in the vertical direction along the cab lift port, and is provided at one end of the support arm portion. A support arm mounter that is pivotally mounted and detachably attached to the upper end of the handrail, and is mounted integrally with the other end of the support arm and positioned below the support arm mounter And a bracket removably assembled to the clamp.

  According to a third aspect of the present invention, the clamp in the mirror device according to the first or second aspect includes a clamp body having a cylindrical portion whose diameter can be reduced by a fastening force of a bolt connecting the support arm portion, and the clamp body. A synthetic resin bush provided inside the cylindrical portion and rotatably fitted to the mirror mounting rod-like body.

  According to the first aspect of the present invention, both ends of the support arm portion are pivotally connected to the mirror mounting rod-like body provided on the cab so as to form a loop, and an intermediate portion of the support arm portion. The mirror mounted on the mirror is supported at both ends, and at least one end of the support arm is pivotally fitted to the mirror mounting rod and connected to a clamp capable of adjusting the clamping pressure, thereby rotating the mirror. Adjustment is possible and vibration of the mirror can be effectively suppressed.

  According to the second aspect of the present invention, the support arm attachment device at one end of the support arm portion is removed from the upper end portion of the handrail, and the clamp is positioned below the support arm attachment device of the handrail. By removing the bracket at the other end of the support arm portion, the mirror can be easily exchanged in the field together with the support arm portion attachment device and the support arm portion provided with the bracket.

  According to the third aspect of the present invention, the anticorrosion coating of the handrail is not damaged by adjusting the force with which the clamp body is fastened by the bolt connecting the support arm and non-metallic contact by the synthetic resin bush. Appropriate holding power can be obtained.

  Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS.

  As shown in FIG. 5, a hydraulic excavator 11 as a construction machine is provided with a lower traveling body 12 in which an upper turning body 13 is turnable, and a cab 14 and a work device 15 are mounted on the upper turning body 13. The cab 14 is provided with an opening 16 and a door 17 is attached to the opening 16 so that the door 17 can be opened and closed. A mirror is attached to the front pillar 18 of the cab 14 along the opening 16 of the cab 14. A hand rail 19 as a rod-like body is disposed in the vertical direction, and a mirror device 21 is attached to the upper portion of the hand rail 19.

  FIG. 1 shows this mirror device 21, and both ends of a support arm portion 22 bent in a substantially U shape with respect to the handrail 19 are connected to each other so as to be rotatable, and this support arm portion is formed. A mirror 23 is attached to a vertically intermediate portion 22a of 22 by a mirror movable portion 24 and a fixture 25 which are provided on the back surface portion of the mirror 23 and sandwich the support arm portion 22, and through the support arm portion 22. The mirror 23 is supported at both ends.

  The support arm portion 22 located at the tip of the shaft portion 22c formed by bending the tip end side of the upper arm portion 22b formed by bending the upper portion horizontally with respect to the intermediate portion 22a of the support arm portion 22 vertically downward. A support arm attachment 26 is rotatably attached to one end of the support arm 26, and the support arm attachment 26 is detachably attached to the upper end of the handrail 19.

  The other end portion of the support arm portion 22 located at the tip of the lower arm portion 22d formed by bending the lower portion horizontally with respect to the intermediate portion 22a of the support arm portion 22 is lower than the support arm portion fixture 26. And is connected to a clamp 27 that is rotatably fitted to the handrail 19 and can adjust the clamping pressure.

  That is, a U-shaped bracket 28 that clamps the clamp 27 is integrally attached to the tip of the lower arm portion 22d of the support arm portion 22 by welding or the like, and this bracket 28 is attached to and detached from the clamp 27 so as to sandwich the clamp 27. The clamps 27 and the brackets 28 are tightened by the bolts 29 that are assembled and inserted into the clamps 27 and the brackets 28 and nuts (not shown) that are screwed with the bolts 29.

  As shown in FIG. 2, the support arm portion attachment device 26 includes a drum 31 formed in a cylindrical shape coaxial with the shaft portion 22 c at the distal end portion of the shaft portion 22 c of the support arm portion 22. Are integrated by a welded portion 33 in a recess 32 formed on the lower end surface of the drum 31, and friction plates 34 and 35 are brought into contact with the lower end surface and upper end surface of the drum 31, respectively. The lower case member 37 and the upper case member 38 fastened to each other by the hexagonal screw 36 are sandwiched between the lower end surface and the upper end surface of the drum 31.

  The upper case member 38 is provided with a stay insertion hole 42 for inserting the shaft portion 22c of the support arm portion 22 at the center of the case main body 41, and a concave groove 43 and a screw insertion hole 44 at three corners of the case main body 41. The three screws 36 are inserted through these screw insertion holes 44 and screwed into the screw holes 46 provided in the case main body 45 of the lower case member 37. At this time, the head of the screw 36 is accommodated in the concave groove 43.

  The lower case member 37 has a mounting fixing portion 51 integrally projecting from the case main body 45, a bolt insertion hole 52 is drilled in the mounting fixing portion 51, and further on the lower surface extending from the mounting fixing portion 51 to the case main body 45. As shown in FIG. 3, a U-shaped mounting plate fitting groove 53 is formed.

  Then, as shown in FIG. 2, the mounting plate fitting groove 53 is fitted to the mounting plate 54 attached to the front pillar 18 forming the cab 14 of the excavator 11, and the bolt insertion hole of the case member 37 is inserted. 52 and a bolt insertion hole 54h drilled in a corresponding position of the mounting plate 54, a bolt 57 is inserted as shown in FIG. 3, and a nut 58 is screwed into the bolt 57 and tightened. The support arm attachment 26 is fixed to the attachment plate 54.

  As shown in FIG. 3, a reinforcing metal fitting 61 is brought into contact with the lower surface of the mounting plate 54, and screws 62 with two hexagonal holes screwed into the two screw holes 46 of the lower case member 37. Thus, the reinforcing metal fitting 61 is fixed.

  As shown in FIG. 4, the clamp 27 has a cylindrical portion 72 that can be reduced in diameter by receiving a fastening force of a bolt 29 and a nut connecting the support arm portion 22 to a pair of fastened portions 71 via a bracket 28. And a synthetic resin bush 74 provided inside the cylindrical portion 72 of the clamp body 73 and rotatably fitted to the handrail 19. Holes 75 for inserting the bolts 29 are formed in the pair of fastened portions 71, respectively.

  As shown in FIG. 1, the bracket 28 is formed by forming a pair of side plate portions 77 in a U shape on a back plate portion 76 welded to the tip of the lower arm portion 22 d of the support arm portion 22. When a bolt 29 inserted from one side plate portion 77 and a nut (not shown) screwed to the bolt 29 outside the side plate portion 77 on the other side are tightened, the pair of side plate portions 77 are inward. It is possible to reduce the diameter of the cylindrical portion 72 of the clamp main body 73 by deforming the pair of clamped portions 71 of the clamp 27 and clamping.

  Next, the function and effect of this embodiment will be described.

  The tightening force of the drum 31 by the case members 37 and 38 is adjusted by adjusting the tightening force by the screw 36 of the support arm mounter 26, and the tightening force by the lower bolt 29 and the nut that is screwed thereto is adjusted. Thus, the tightening torque of the synthetic resin bush 74 by the clamp 27 is adjusted, and the support arm portion 22 of the mirror 23 is attached to the handrail 19 with an appropriate pivotable tightening torque.

  When the mirror 23 or the like is damaged, the support arm attachment 26 and the bracket 28 are provided by removing the screw 62 of the reinforcing bracket 61, the upper bolt 57 and the nut 58, and the lower bolt 29 and the nut. The mirror 23 together with the support arm 22 is removed from the handrail 19 and replaced with a new one.

  Both ends of the support arm portion 22 are rotatably connected to the handrail 19 provided on the cab 14 to form a loop, and the mirror 23 attached to the intermediate portion of the support arm portion 22 is held at both ends. At the same time, at least one end of the support arm 22 is pivotally fitted to the handrail 19 and connected to a clamp 27 that can adjust the clamping pressure, thereby enabling the mirror 23 to be pivotally adjusted. The vibration of the mirror 23 can be effectively suppressed.

  For example, the resonance vibration can be prevented by sufficiently raising the primary natural frequency of the mirror stay structure such as the support arm portion 22 above the frequency caused by the vibration at the time of the vehicle running at the highest speed.

  Remove the support arm attachment 26 at one end of the support arm 22 from the upper end of the handrail 19 and remove the support arm 22 from the clamp 27 located below the support arm attachment 26 of the handrail 19. By removing the end bracket 28, the mirror 23 can be easily exchanged in the field together with the support arm portion fixture 26 and the support arm portion 22 provided with the bracket 28.

  A handrail is provided by adjusting the force by which a pair of tightened portions 71 of the clamp body 73 are fastened by means of bolts 29 and nuts that connect the support arm portion 22 via the bracket 28 and non-metallic contact by the synthetic resin bush 74. Appropriate holding force is obtained without damaging the 19 anticorrosive coating.

  In the illustrated embodiment, one end of the support arm 22 is attached to the handrail 19 by the support arm attachment 26 and the other end of the support arm 22 is attached to the handrail 19 by the clamp 27 and the bracket 28. However, an embodiment in which both end portions of the support arm portion 22 are connected to the handrail 19 by the clamp 27 and the bracket 28 may be adopted.

  The present invention is a mirror device that can be used for a cab of a construction machine such as a hydraulic excavator, a bulldozer, a loader, or a cab of a transport vehicle such as a dump truck.

It is a perspective view which shows one Embodiment of the mirror apparatus based on this invention. It is sectional drawing of the support arm part fixture of a mirror apparatus same as the above. It is a bottom view of the support arm part fixture of a mirror apparatus same as the above. It is a perspective view of the clamp of a mirror apparatus same as the above. It is a perspective view of the construction machine provided with the mirror apparatus same as the above. It is a front view which shows a part of cab provided with the conventional mirror apparatus.

Explanation of symbols

14 cab
16 Entrance
19 Handrail as a mirror mounting rod
21 Mirror device
22 Support arm
23 Mirror
26 Support arm mounter
27 Clamp
28 Bracket
29 volts
72 Cylindrical part
73 Clamp body
74 Synthetic resin bush

Claims (3)

A mirror mounting rod provided on the cab;
A support arm portion formed in a loop shape with both ends rotatably connected to the mirror mounting rod-shaped body,
A mirror that is attached to the middle part of the support arm part and supported at both ends via the support arm part;
At least one end of the supporting arm portion is connected to a clamp that is rotatably fitted to the mirror mounting rod-like body and can adjust the clamping force. The mirror mounting rod-like body is a handrail arranged in the vertical direction along the cab lift opening,
A support arm mounter that is rotatably attached to one end of the support arm and detachably attached to the upper end of the handrail;
2. The mirror device according to claim 1, further comprising: a bracket that is integrally attached to the other end portion of the support arm portion and is detachably attached to a clamp positioned below the support arm portion attachment device. . The clamp
A clamp body having a cylindrical portion that can be reduced in diameter by a fastening force of a bolt connecting the support arm portion;
The mirror device according to claim 1 or 2, further comprising: a synthetic resin bush provided inside the cylindrical portion of the clamp body and rotatably fitted to a mirror mounting rod-like body.

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