JP2009154792A - Side mirror apparatus of construction equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a side mirror apparatus of construction equipment where a side mirror can be easily moved between an overhang position and a retreated position with a simple structure. <P>SOLUTION: This side mirror apparatus of the construction equipment includes a stay 21 with the side mirror attached to one end part, a stay holder 22 that retains the other end part 21b of the stay 21 rotatably and movably in a vertical direction, a guide member 227 that is attached to the other end part 21b of the stay 21 in the stay holder 22 and has two guide grooves at an outer periphery edge, a guide claw 220 that is provided in the stay holder 22, regulates rotation around an axial line of the other end part 21b of the stay 21 with engaged with the one guide groove, and releases the engagement when the stay 21 is moved upward, and a compression coil spring 229 that supports the guide member 227 downward to the direction of the guide claw 220. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a side mirror device provided in a construction machine.

For example, in a construction machine such as a hydraulic excavator, a side mirror is attached to one front side of the upper swing body so that an operator in the cab can visually recognize the rear of the construction machine.
The side mirror used in such a construction machine is projected relatively large to the outside of the upper swing body in order to improve visibility. For this reason, when the construction machine is mounted on a transport vehicle and transported, the side mirror may protrude outward from the vehicle width of the transport vehicle. If the construction machine is transported in such a state, the side mirror may come into contact with a utility pole, a house, or the like while the transportation vehicle is running, and there is a risk that not only the side mirror but also a standing object may be damaged. Therefore, the side mirror is movable in order to prevent such problems, and can be retracted to fit within the width of the transport vehicle during transportation of the construction machine.

  Specifically, the side mirror is attached to a stay, and the stay is attached to the outer surface of the cab via a support member. The stay is fastened and fixed to the support member with a nut, and the side mirror can be moved between the extended position and the retracted position during operation by loosening the nut. In the case of such a fixed type with a nut, there is a problem that it takes time to change the position of the side mirror. Further, if the nut is loosened during the operation or transportation of the construction machine, the side mirror is not fixed at a predetermined position, and the following problems occur. For example, if the nut is loosened while working on rough terrain, the side mirror may be displaced from the overhang position, which may hinder the work of the construction machine. In addition, if the nut is loosened while the construction machine is being transported with the side mirror retracted to the retracted position, the side mirror may move from the retracted position to the extended position, and may come into contact with the above-described utility pole or house.

Therefore, as a conventional technique, a locking pin with a knob is attached to the support member of the stay, and the stay is fixed to and released from the support member by inserting and removing the locking pin, thereby easily changing the position of the side mirror and There has been proposed a side mirror support device for a construction machine intended to be reliably performed (see Patent Document 1).
JP 2006-290030 A

  As described above, the conventionally known side mirror support device for construction machine disclosed in Patent Document 1 fixes the side mirror to the extended position or the retracted position by inserting the locking pin with the knob, and the engagement with the knob. The side mirror can be unlocked by pulling out the stop pin, and the side mirror can be moved to the retracted or overhanging position, and can be fixed at that position by reinserting the locking pin with the knob after the movement. .

However, the side mirror support device for a construction machine of Patent Document 1 needs to additionally include a locking pin with a knob and a locking pin insertion / extraction mechanism associated therewith, and the mechanism is complicated. For this reason, there is an increase in the number of parts and a reduction in assembly work efficiency, resulting in an increase in manufacturing cost.
The present invention has been proposed in order to solve the above-described problem, and a side of a construction machine that can easily and reliably perform fixing and releasing of a side mirror at a predetermined position with a simple mechanism. An object is to provide a mirror device.

  In order to achieve the above object, a side mirror device for a construction machine according to the first aspect of the present invention is a side mirror device mounted on a construction machine, which supports the side mirror, while being sideways from the construction machine. In a side mirror device of a construction machine, including a support means that can be positioned by being selected from any of an overhanging position and a retracting position on the construction machine side, the support means has one end to which the side mirror is attached. A stay having a vertical other end, and fixed to the construction machine, receiving the other end of the stay, and moving the side mirror between the extended position and the retracted position. A stay holder that supports the other end pivotably about its axis and allows the stay to move vertically; and the stay A rotating member attached to the other end portion and rotating and moving up and down integrally with the other end portion in the stay holder, and the projecting position of the side mirror spaced apart from the rotating member in the circumferential direction And two fitted portions provided corresponding to the retracted positions, and provided in the stay holder, and the rotating member is moved up and down via the stays, thereby moving one of the fitted portions. When the mating or unmating is performed and the mating part is in the mating state, the pivoting of the pivoting member is restrained, and the projecting position or the retracting position corresponding to the mating part is used. A restraining portion that holds the side mirror; and is disposed in the stay holder, and biases the stay via the rotating member in the vertical direction in which the restraining portion is fitted to the fitted portion, The fitting state of the restraining part It is characterized in that a biasing member to maintain.

The side mirror device for a construction machine according to a second aspect of the present invention is the side mirror device for a construction machine according to the first aspect, wherein the fitted portion is a groove formed by cutting out an outer peripheral edge of the rotating member. The restraint portion is a claw that can be fitted into the groove.
The side mirror device for a construction machine according to a third aspect of the present invention is the side mirror device for a construction machine according to the first or second aspect, wherein the support means is provided in the stay holder, and the engagement state of the restraint portion And a stopper that restricts the vertical stroke of the stay by abutting against the rotating member when the is released.

  The side mirror device for a construction machine according to claim 4 of the present invention is the side mirror device for a construction machine according to claim 3, wherein the biasing member is a compression coil spring surrounding the other end of the stay, The stopper has a cylindrical shape arranged concentrically with the compression coil spring.

According to the first to fourth aspects of the present invention, the rotation of the rotating member integrally attached to the other end of the stay is restrained from being rotated in the axial direction of the other end of the stay. Since it can be released by moving, the side mirror can be selected and positioned in either the extended position or the retracted position easily and reliably without adding another mechanism.
According to the second aspect of the present invention, the fitted portion of the rotating member is a groove, and the restraining portion is a claw that can be fitted into the groove, and the turning member is restricted to rotate. The structure is not complicated, contributing to failure prevention and improving the efficiency of assembly work.

According to the third aspect of the present invention, since the stopper is provided in the stay holder, it is possible to prevent the stay from being pushed into the stay holder or pulled out from the stay holder more than necessary. Thereby, failure of the side mirror device can be prevented and the life can be extended.
According to the fourth aspect of the present invention, since the urging member is a compression coil spring and the stopper is a cylindrical shape arranged concentrically with the compression coil spring, the buckling of the spring is suppressed, A failure of the side mirror device can be prevented.

(First Example)
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a side mirror device for a construction machine according to the present invention will be described with reference to the drawings.
The construction machine to which the present invention is applied is not particularly limited. For example, a case where the present invention is applied to the hydraulic excavator shown in FIG. 1 will be described.

  The hydraulic excavator 1 in FIG. 1 includes a lower traveling body 11, and an upper swing body 12 is provided on the lower traveling body 11 so as to be able to swivel. The upper swing body 12 is provided with a cab 13 on the left side of the front part thereof. The upper swing body 12 includes side mirror devices 14 and 15 for the operator to visually recognize the rear from the inside of the cab 13, and these side mirror devices 14 and 15 are attached to the handrails 16 and 17 for lifting the hydraulic excavator. Each is arranged. The lifting handrail 16 is disposed along the edge of the door on the left side surface of the cab 13, while the lifting handrail 17 is disposed on the right side of the upper swing body 12.

  FIG. 2 shows an enlarged view of portion A in FIG. 1, that is, the side mirror device 14. The side mirror device 14 includes a side mirror 14m and a support assembly 14a that supports the side mirror 14m on the handrail 16 for raising and lowering. The support assembly 14a includes a stay 21 having a side mirror 14m attached to one end thereof, And a stay holder 22 for holding the other end of the stay 21 on the handrail 16 for raising and lowering.

  More specifically, the stay 21 is a metal pipe having a substantially U shape that faces downward, and one end 21a thereof is coupled to the side mirror 14m via the fixture 3. The fixture 3 includes a hollow cylindrical body 31 that is rotatably fitted to one end portion 21a, and an arm 32 projects from the cylindrical body 31 on the radially outer side. On the other hand, a pedestal 33 is attached to the rear surface of the side mirror 14m, and a pair of brackets 34 project from the pedestal 33. These brackets 34 receive the tip of the arm 32 therebetween, and are connected to the arm 32 via a horizontal hinge pin 35. According to such a fixture 3, the side mirror 14 m is turned in the horizontal direction around the one end 21 a of the stay 21 via the cylindrical body 31, thereby adjusting the horizontal tilt angle of the side mirror 14 m. The tilt angle of the side mirror 14m in the vertical direction can be adjusted by rotating the side mirror 14m in the vertical direction around the hinge 35. Furthermore, a cap 4 is fitted to the lower end of one end 21 a of the stay 21, and this cap 4 prevents intrusion of earth and sand, rainwater, etc. into the stay 21.

On the other hand, the stay holder 22 is attached to the lifting handrail 16, that is, the bracket 221 that protrudes horizontally from the lifting handrail 16, and the bracket 221 is welded to the lifting handrail 16.
The stay holder 22 has an upper member 224 and a lower member 225. A portion of the upper member 224 overlaps the bracket 221 from above, and is fixed to the bracket 221 by a pair of bolts 223 at the overlap portion. On the other hand, the lower member 225 is disposed adjacent to the bracket 221 below the upper member 224.

  The internal structure of the stay holder 22 is shown in FIG. As is apparent from FIG. 3, the stay holder 22 has a cylindrical holder chamber 22 a therein, and the holder chamber 22 a is formed between the upper member 224 and the lower member 225. Further, a pair of screw holes 224c and through holes 225c are formed in the upper member 224 and the lower member 225 at positions avoiding the holder chamber 22a, and the screw holes 224c and the through holes 225c that form a pair are coaxial with each other. And extends in the vertical direction. Therefore, when the fastening bolt 226 is screwed into the screw hole 224c through the corresponding through hole 225c, the lower member 225 is coupled to the upper member 224 via the pair of fastening bolts 226. The arrangement of the pair of fastening bolts 226, that is, the arrangement of the pair of through holes 225c will be apparent with reference to FIG.

As shown in FIG. 3, a through hole 224a is formed in the upper wall of the upper member 224. The through hole 224a has an inner diameter through which the other end 21b of the stay 21 can be inserted, and the holder chamber 22a. Communicating with
On the other hand, a through hole 225b having a smaller diameter than the through hole 224a is formed in the lower wall of the lower member 225. The through hole 225b is positioned coaxially with the through hole 224a and communicates with the holder chamber 22a. Yes.

  In the holder chamber 22a, the other end 21b of the stay 21 is disposed through the through hole 224a of the upper member 224, and the other end 21b has a screw portion 21c at the lower end. The screw portion 21 c has a smaller diameter than the outer diameter of the stay 21 and forms a step at the other end portion 21 b of the stay 21. The screw portion 21c is attached by screwing into the stay 21. Then, a disk-shaped guide member 227 and a nut 228 are attached to the screw portion 21c, and the nut 228 is fastened and fixed to the other end portion 21b by sandwiching the guide member 227 with the above-described step, Thereby, the guide member 227 can rotate integrally with the other end part 21b.

The lower end of the screw portion 21c protrudes from the nut 228 and is inserted into the through hole 225b of the lower member 225 with some play. In FIG. 3, the nut 228 is shown in a state of being lifted from the lower wall of the lower member 225 for convenience of drawing. Normally, the nut 228 is attached to the lower wall of the lower member 225 by its own weight such as the stay 21. It is in a contact state.
The guide member 227 is made of metal and has a diameter that is larger than the outer diameter of the stay 21 but smaller than the inner diameter of the holder chamber 22a. Therefore, the outer periphery of the guide member 227 does not come into contact with the inner peripheral wall of the holder chamber 22a. As shown in FIG. 4, the guide member 227 has a through hole 271a through which the threaded portion 21c of the stay 21 is inserted at the center thereof, and two guide grooves 227a and 227b are cut at the outer peripheral edge thereof. The guide grooves 227a and 227b are formed so as to have a gap of 90 degrees in the circumferential direction of the guide member 227.

One of the guide grooves 227a and 227b is fitted with a plate-like guide claw 220, and the guide claw 220 protrudes from the inner peripheral wall of the holder chamber 22a described above toward the center of the holder chamber 22a. More specifically, the guide claw 220 is fitted and attached to the inner peripheral surface of the lower member 225 that forms the inner peripheral wall of the holder chamber 22a.
The guide claw 220 is disposed at a reference position as viewed in the circumferential direction of the holder chamber 22a. This reference position will be described below. In the present invention, the guide claw 220 is fitted into one of the guide grooves 227a and 227b of the guide member 227 described above, whereby the rotation angle position of the stay 21 via the guide member 227, that is, the side mirror 14m The position is determined. Specifically, as shown in FIG. 4, when the guide claw 220 is fitted in the guide groove 227 b, the side mirror 14 m is positioned at the retracted position in front of the cab 13. Is fitted in the guide groove 227a, the side mirror 14m is positioned at the overhanging position that overhangs to the side of the cab 13.

Here, as shown in FIG. 5 which shows a schematic configuration when viewed from above the cab 13, a position where the side mirror 14m projects to the side of the cab 13 is defined as an overhang position, and the side mirror 14m extends from the overhang position. A position moved to the cab 13 side, for example, a position represented by a two-dot chain line is defined as a drawing position.
Note that the reference position of the guide claw 220 may be arbitrarily determined, but in this embodiment, as shown in FIG. 4, it is set at approximately the middle of the through holes 225c and 225c as seen in the circumferential direction of the holder chamber 22a. Has been. Further, the guide claw 220 has a protruding length that can be appropriately fitted to the guide groove 227a or 227b of the guide member 227, and extends in the axial direction of the holder chamber 22a longer than the thickness dimension of the guide member 227. In this embodiment, the guide claw 220 extends from the upper surface of the lower member 225 to the lower wall as seen in FIG.

  Further, a compression coil spring 229 is disposed in the holder chamber 22 a between the guide member 227 and the upper wall of the upper member 224, and this compression coil spring 229 surrounds the other end 21 b of the stay 21. . The compression coil spring 229 biases the stay 21 downward through the guide member 227, that is, in the direction of the arrow B as viewed in FIG. 3, and maintains the fitting state of the guide claw 220 with respect to the guide groove 227a or 227b.

Here, for example, when the guide claw 220 is fitted in the guide groove 227a of the guide member 227 and the side mirror 14m is positioned at the overhang position, the rotation of the other end portion 21b of the stay 21 around the axis line is performed. Is blocked by the guide claw 220, the side mirror 14m is stably held at the overhang position.
When the stay 21 is pulled up in the direction of arrow C along with the guide member 227 against the urging force of the compression coil spring 229 from the above state, the fitting of the guide claw 220 to the guide groove 227a of the guide member 227 is released. Thus, the stay 21 can be rotated around the axis of the other end 21b. Therefore, if the side mirror 14m is moved from the extended position to the retracted position via the stay 21 while the stay 21 is lifted, and the lift of the stay 21 is released, the stay 21 is attached to its own weight and the compression coil spring 229. The guide claw 220 is fitted into the guide groove 227b of the guide member 227, and the stay 21, that is, the side mirror 14m is fixedly held in the retracted position. Is done.

In this embodiment, the bracket 221 and the lower member 225 of the stay holder 22 are separate members. However, the lower member 225 and the bracket 221 may be integrated with each other and the stay holder 22 may be directly fixed to the lifting handrail 16. Furthermore, the stay holder 22 may be fixed to the outer surface of the cab 13 regardless of the presence or absence of the bracket 221.
The present invention is not limited to the first embodiment described above, and various modifications are possible. The side mirror devices of the second to fifth embodiments will be described below with reference to FIGS. . In the description of the second to fifth embodiments, members and parts that exhibit the same functions as those of the first embodiment and the already described embodiments are denoted by the same reference numerals, and the description thereof is omitted. Only the differences will be described.
(Second embodiment)
FIG. 6 shows a second embodiment.

The stay holder 23 according to the second embodiment includes a plate-like lower member 235 instead of the lower member 225 according to the first embodiment.
The lower member 235 is coupled to the upper member 224 by four bolts 236, and these bolts 236 are arranged at equal intervals in the circumferential direction of the holder chamber 22a.
The lower member 235 has a through hole 235a formed at a position facing the through hole 224a of the upper member 224. The through hole 235a has the same inner diameter as the through hole 224a. Therefore, the through hole 235a can be inserted through the other end 21b of the stay 21 in the same manner as the through hole 224a.

  In the case of the second embodiment, the guide member 227 has a through hole having the same diameter as the stay 21 at the center thereof, and the stay 21 is inserted through the through hole. The guide member 227 is welded to the outer peripheral surface of the other end portion 21 b of the stay 21 above the screw portion 21 c of the stay 21. A compression coil spring 229 is disposed between the guide member 227 and the lower member 235, and the compression coil spring 229 biases the stay 21 in the direction of arrow C via the guide member 227. That is, unlike the case of the first embodiment, the guide member 227 is biased toward the upper member 224, that is, the ceiling surface of the holder chamber 22a.

On the other hand, the guide claw 220 is provided not on the lower member 235 but on the inner peripheral surface of the upper member 224 forming the holder chamber 22a, and is fitted in the guide groove 227a or 227b of the guide member 227.
As is clear from FIG. 6, the other end 21b of the stay 21 protrudes below the stay holder 23 through the through hole 235a of the lower member 235, and a washer 230 and a nut 228 are attached to the screw portion 21c of the other end 21b. The washer 230 is positioned so as to be sandwiched between the lower member 235 and the nut 228, and has an outer diameter larger than the inner diameter of the through hole 235a.

Therefore, when the stay 21 is biased upward (in the direction of arrow C) by the compression coil spring 229, the guide member 227 abuts against the ceiling wall of the holder chamber 22a, or the washer 230 is the lower surface of the lower member 235. In this state, the guide claw 220 is fitted in the guide groove 227a or 227b of the guide member 227.
According to the second embodiment, when the stay 21 is pushed downward against the biasing force of the compression coil spring 229, that is, in the direction of arrow B, the guide claw 220 is fitted into the guide groove 227a or 227b of the guide member 227. The match is released. Thereby, the side mirror 14m is movable between the extended position and the retracted position via the stay 21 as in the case of the first embodiment.

In the case of the present embodiment, as described above, when the side mirror 14m is moved between the extended position and the retracted position, the stay 21 is pushed into the stay holder 22, so that the lower member 235 is pushed downward. The pressure becomes stronger than in the first embodiment. However, since the lower member 235 is coupled to the upper member 224 by the four bolts 236, the pressing force can be stably received.
(Third embodiment)
The third embodiment of FIG. 7 differs from the first embodiment only in that it further includes a stopper 251 disposed in the holder chamber 22a.

  The stopper 251 is a resin hollow cylindrical member having an inner diameter slightly larger than that of the compression coil spring 229 and substantially the same outer diameter as the guide member 227. The stopper 251 extends toward the guide member 227 while being fixed to the ceiling wall of the holder chamber 22a, and partially surrounds the compression coil spring 229. The stopper 251 has a sufficient length to prevent the compression coil spring 229 from buckling while securing a space required for releasing the fitting of the guide claw 220 described above between the stopper 251 and the guide member 227. Have.

According to the third embodiment, when the operator lifts the stay 21 in the direction of arrow C, the guide member 227 contacts the stopper 251 and prevents the stay 21 from being pulled out from the stay holder 22 more than necessary. Thereby, the screw portion 21c of the stay 21 does not undesirably come out from the through hole 225b of the lower member 225. Further, the stopper 251 not only limits the amount of compression of the compression coil spring 229, but also can reliably prevent buckling of the compression coil spring 229 by surrounding the compression coil spring 229 from the outside. As a result, the failure of the side mirror device can be prevented and the life can be extended.
(Fourth embodiment)
In the fourth embodiment of FIG. 8, a stopper 261 that exhibits the same function as the stopper 251 of the third embodiment is added to the second embodiment, and this stopper 261 is fixed to the lower member 235. The pressing stroke of the stay 21 is restricted.
(Fifth embodiment)
In the case of the fifth embodiment of FIG. 9, the guide member 227 has, for example, seven guide grooves 227c to 227i along the outer periphery of the outer periphery, and these guide grooves are equally spaced in the circumferential direction of the guide member 227. Exist.

  In the case of the fifth embodiment, when the guide claw 220 is fitted into the guide groove 227c, for example, if the side mirror 14m is positioned at the overhang position, the guide claw 220 is fitted into the guide groove 227i. When this is done, the side mirror 14m is pulled to a position that is substantially parallel to the front glass of the cab. In the present embodiment, the range from the extended position to the retracted position can be expanded, and the position of the side mirror 14m can be further finely adjusted in five steps between the extended position and the retracted position. The number of guide grooves may be arbitrarily determined.

  Furthermore, the first to fifth embodiments described above can be applied not only to the side mirror device 14 on the cab 13 side but also to the side mirror device 15 on the right side of the upper swing body 12.

It is a perspective view which shows the hydraulic excavator as a construction machine. It is the perspective view which expanded the inside of the circle A in FIG. 1, and showed the side mirror apparatus which concerns on a 1st Example. It is sectional drawing which shows the stay holder of the side mirror apparatus of FIG. It is a top view which shows the guide member of FIG. It is a top view which shows schematic structure when a driver's cab is seen from upper direction. It is sectional drawing which shows the stay holder of the side mirror apparatus which concerns on a 2nd Example. It is sectional drawing which shows the stay holder of the side mirror apparatus which concerns on 3rd Example. It is sectional drawing which shows the stay holder of the side mirror apparatus which concerns on 4th Example. It is a top view of the guide member of the side mirror apparatus which concerns on 5th Example.

Explanation of symbols

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 3 Attachment 11 Lower traveling body 12 Upper revolving body 13 Driver's cab 14a Support assembly 14m Side mirror 14,15 Side mirror device 16,17 Handrail 21 for raising / lowering 21 Stay 22 Stay holder 220 Guide claw 221 Bracket 224 Upper member 225 Lower member 227 Guide member 227a, b Guide groove 229 Compression coil spring 251 Stopper 261 Stopper

Claims (4)

A side mirror device mounted on a construction machine, which supports the side mirror, and can be positioned by selecting either a projecting position projecting laterally from the construction machine or a retracting position on the construction machine side In a side mirror device of a construction machine comprising means,
The support means is
A stay having one end to which the side mirror is attached and having a vertical other end;
It is fixed to the construction machine, receives the other end of the stay, and rotates the other end about its axis to move the side mirror between the extended position and the retracted position. A stay holder that freely supports and allows the stay to move in the vertical direction;
A rotation member attached to the other end portion of the stay, and rotated and moved up and down integrally with the other end portion in the stay holder;
Two fitted portions that are spaced apart from each other in the circumferential direction of the rotating member and are provided corresponding to the protruding position and the retracted position of the side mirror;
It is provided in the stay holder, and the rotating member is moved up and down through the stay, so that the fitting or releasing of the fitting with respect to one of the fitted parts is performed. A restraining portion that restrains the turning of the turning member and holds the side mirror at the extended position or the retracted position corresponding to the fitted portion;
The stay is urged via the rotating member in the up-and-down direction that is disposed in the stay holder and fits the restraining portion with respect to the fitted portion, and maintains the fitting state of the restraining portion. A side mirror device for a construction machine comprising an urging member. The fitted portion is a groove formed by cutting out the outer peripheral edge of the rotating member;
The side mirror device for a construction machine according to claim 1, wherein the restraining portion is a claw that can be fitted into the groove.   The support means is further provided with a stopper provided in the stay holder and restricting the vertical stroke of the stay by contact with the rotating member when the fitting state of the restraining portion is released. The side mirror device for a construction machine according to claim 1 or 2. The biasing member comprises a compression coil spring surrounding the other end of the stay,
The side mirror device for a construction machine according to claim 3, wherein the stopper has a cylindrical shape that is concentrically arranged with the compression coil spring.

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