JP5299202B2 - Mirror for work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly durable mirror for a working machine by which a stay can be rotated or fixed without using a tool, and adjustments can be performed easily. <P>SOLUTION: The mirror for the working machine is provided with a stay 7 supporting the mirror, and a mounting member 8 supporting the stay 7 and being fitted to a vehicle. The mounting member 8 includes a boss 12 having press-contact surfaces on both ends, and a shaft hole 15 formed to be perpendicular to the press-contact surfaces in a manner of penetrating the boss 12. The stay 7 includes a cylindrical rotary shaft 31 inserted into the shaft hole 15, and a flange 32 projecting largely from a base end of the rotary shaft 31. A pressure-contact ring 21 rotatable with the stay 7 is fitted to a front end of the rotary shaft 31 projecting from the shaft hole 15. A pressure adjusting nut 22 pressing the pressure-contact ring 21 toward the boss 12 is fastened to the rotary shaft 31. Resin washers 20 are fitted in a manner of contacting with the pressure-contact surfaces. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mirror used in a work machine such as a hydraulic excavator.

  In order to improve workability, the mirror used in the work machine is usually provided so as to protrude largely outward from the vehicle body as compared with an automobile or the like. Therefore, this type of mirror is often retractable because it interferes when mounted on a transport vehicle.

  Regarding such a retractable mirror, for example, a mirror mounting device is disclosed in which a mirror stay can be rotated and fixed without using a tool (Patent Document 1).

  In the case of this mirror mounting device, a cylindrical drum is formed at the end of the stay, and the upper and lower surfaces of the drum are sandwiched between a pair of friction plates. The friction plate is a special metal mesh washer formed by coating an annular metal mesh with a resin. The drum and the pair of friction plates are accommodated so as to be sandwiched between a pair of upper and lower case members fastened by three screws. The frictional resistance between the drum and the friction plate is adjusted by the tightening degree of the three screws.

  By doing so, the stay can be rotated to an arbitrary angle by rotating strongly against the frictional resistance, and the stay can be fixed at an arbitrary position by the sliding resistance of the friction plate.

JP 2006-182088 A

  However, in the case of the mirror mounting device of Patent Document 1, since the frictional resistance is adjusted by the tightening degree of the three screws, it is necessary to finely adjust the three screws by evenly tightening them, which is troublesome. However, there are disadvantages that are difficult to adjust. If the adjustment cannot be performed well and the tightening balance is lost, the friction plate is unevenly worn, and play tends to occur.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a mirror for a working machine that can rotate and fix a stay without using a tool, is easy to adjust, and has excellent durability. Is to provide.

  In order to achieve the above object, the present invention devised a support structure for the stay of the mirror.

That is, a mirror for a working machine according to the present invention includes a mirror body , a stay that supports the mirror body , and an attachment member that supports the stay and is attached to a vehicle, and the attachment members are mutually attached. A bearing portion in which parallel pressure contact surfaces are formed at both ends; and a shaft hole that passes through the bearing portion perpendicular to the pressure contact surface; and the stay has a fitting portion at a tip portion; A rotation shaft portion that is inserted so that the tip end portion projects into the shaft hole, and a flange portion that protrudes from the base end portion of the rotation shaft portion to be larger than the inner diameter of the shaft hole. A member is attached so as to be in contact with the pressure contact surface, and is fitted to a fitting hole formed in the center at a distal end portion of the rotation shaft portion protruding from the shaft hole and having a diameter larger than the inner diameter of the shaft hole. write fitted is pressed against member rotates together with the stay by the engaging portion is fitted Is, said concluded member to the tip portion of the rotating shaft portion is fastened, the outer diameter of the pressing member is equal to or greater than the outer diameter of the fastening member, the pressing member is, by the fastening member in contact with the surface It is pressed against the bearing part side .

  According to the mirror having such a configuration, the stay is supported by the mounting member with the flange portion and the pressure contact member sandwiching the pressure contact surfaces at both ends of the bearing portion with the buffer member interposed therebetween. By adjusting the degree, the stay can be freely rotated and fixed at an arbitrary angle.

  Even if the stay is repeatedly rotated, the rotation shaft portion and the pressure contact member rotate together, so that the fastening member can be prevented from being loosened. The adjustment when the fastening member is loosened is simple because it only changes the tightening degree of one fastening member, and the workability is excellent. Since the force due to tightening of the fastening member is applied almost uniformly to the pressure contact surface, the durability is excellent.

  In particular, it is effective when an annular resin washer is used for the buffer member.

  The frictional resistance is eased by the resin washer, and the rotation of the stay is stabilized. Since it is difficult to wear evenly, it can be used until it becomes thin, and it can be used without being replaced for a long time even if it is made of resin.

  Bolts and nuts can be used as the fastening members, but if they are used, the appearance is improved and inadvertent catching can be prevented.

  A cylindrical resin bush may be attached to the shaft hole. If it does so, rotation of a stay becomes smooth and durability and operativity improve.

  As described above, according to the present invention, it is possible to freely rotate the stay without using a tool and fix it at an arbitrary angle, and it is easy to adjust and is a mirror for a working machine that is excellent in durability. Can be provided.

1 is a schematic perspective view of a hydraulic excavator to which the present invention is applied. It is a disassembled perspective view which shows the principal part of a mirror. It is a schematic sectional drawing which shows the principal part of a mirror. It is the XX sectional view taken on the line in FIG. FIG. 6 is a view corresponding to FIG. 3 showing a first modification. FIG. 10 is a view corresponding to FIG. 3 showing a second modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

  FIG. 1 shows a hydraulic excavator (work machine) to which the present invention is applied. This hydraulic excavator is a general excavator, and an upper swing body 2 is rotatably mounted on a crawler type lower traveling body 1, and an attachment 3 and a cab 4 are arranged on the upper swing body 2. It is installed. The attachment 3 is composed of a bucket, an arm, and the like, and is supported at the front central portion of the upper swing body 2 so as to be raised and lowered. The cab 4 is formed in a box shape with a window, a door, or the like, and is disposed on the left side of the attachment 3. The cab 4 is equipped with a driver's seat on which an operator is seated, various operation devices, and instruments.

  A side mirror 5 is attached to the upper left corner of the cab 4. The side mirror 5 is provided in order to secure a rear visual field on the left side of the vehicle, and can be rotationally displaced between a use position protruding sideways from the vehicle side portion and a storage position along the vehicle side portion. (Foldable).

  2 to 4 show details of the side mirror 5. The side mirror 5 includes a mirror body 6, a stay 7, an attachment member 8, and the like, and is configured to be freely rotated without using a tool and fixed at an arbitrary position.

  The attachment member 8 has a base portion 11 and a boss portion 12 (bearing portion). The base portion 11 is formed by bending a belt-shaped metal plate material into a substantially L shape, and includes a short base end portion 11a and a long tip end portion 11b. The boss portion 12 is formed by welding a lower end surface 12b of a cylindrical metal member to the upper surface of the tip end portion 11a. A fastening seat portion 13 is provided at the base end portion 11b, and a rod-like support member 14 is fixed to the lower surface of the distal end portion 11b. The fastening seat 13 is attached to the upper part of the cab 4 with bolts, and the lower end of the support member 14 is attached to the lower part of the cab 4.

  The upper end surface 12a of the boss portion 12 is formed on a smooth surface parallel to a portion (corresponding to the lower end surface 12b of the boss portion 12) opposite to the lower surface of the tip portion 11b. A cylindrical shaft hole 15 is formed so as to be perpendicular to the upper and lower end faces 12a, 12b (pressure contact surfaces) and to penetrate between them.

  The mirror main body 6 has a vertically long mirror frame 6a with a mirror surface attached to one surface, and a stay attaching portion 6b provided on the other surface of the mirror frame 6a. The stay mounting portion 6b is provided with a support portion 6c that can be rotated about the horizontal axis, and the tip portion of the stay 7 is attached to the support portion 6c so as to be rotatable about the vertical axis.

  The stay 7 is made of a bar-shaped metal member bent in a U-shape, and as shown in FIG. 2, the base end portion thereof is made of a resin washer 20 (buffer member), a pressure contact ring 21 (pressure contact member), a pressure regulating member. By being assembled together with the nut 22 (fastening member), the boss portion 12 is rotatably supported.

  Specifically, as shown in FIG. 3, the base end portion of the stay 7 includes a columnar rotation shaft portion 31 and an annular flange portion 32 that projects from the base end portion of the rotation shaft portion 31 in the circumferential direction. And are provided. The outer diameter of the rotating shaft part 31 is formed slightly smaller than the inner diameter of the shaft hole 15 of the boss part 12 (clearance fitting). The outer diameter of the flange portion 32 is formed to be larger than the inner diameter of the shaft hole 15 of the boss portion 12, and the tip side surface (also referred to as a pressure contact surface 32 a) of the rotation shaft portion 31 is formed on the rotation shaft portion 31. It is an orthogonal smooth surface.

  The distal end portion of the rotation shaft portion 31 has a fitting portion 33 having a rotation restricting portion 33a formed so as to cut out a part of the outer periphery, and is formed on the distal end side from the fitting portion 33, and is formed on the outer periphery with a male portion. And a male screw portion 34 formed with a screw. The dimension of the rotating shaft portion 31 in the axial direction is larger than that of the boss portion 12.

  The resin washer 20 is an annular member formed of a hard resin having excellent weather resistance and wear resistance, such as nylon or fluororesin. The inner diameter of the insertion hole 20a of the resin washer 20 is preferably formed to be slightly smaller than the outer diameter of the rotating shaft portion 31 (tight fit). This is because it can be held on the stay 7 when inserted and is excellent in assembling workability. In this embodiment, two sheets are attached so as to contact both the upper and lower pressure contact surfaces of the boss portion 12.

  The pressure contact ring 21 is a thick annular metal member, and has an outer diameter larger than the inner diameter of the shaft hole 15 of the boss portion 12. As shown in FIG. 4, a fitting hole 21 a that fits with the fitting portion 33 of the rotation shaft portion 31 is formed in the center of the pressure contact ring 21. Therefore, when the press contact ring 21 is fitted into the fitting portion 33, the press contact ring 21 is restricted by the rotation restricting portion 33 a and rotates together with the turning shaft portion 31. The thickness of the pressure contact ring 21 is set to be larger than ½ of the outer diameter of the rotating shaft portion 31 in order to improve the support stability of the stay 7. However, since the support stability hardly changes even if it is larger than the outer diameter of the rotating shaft part 31, it is preferable to set it below that.

  The pressure adjusting nut 22 is a known nut and has a female screw that is screwed into the male screw portion 34.

  In order to attach the stay 7 to the attachment member 8, for example, after attaching one of the resin washers 20 to the rotation shaft portion 31, the rotation shaft portion 31 is inserted into the shaft hole 15 of the boss portion 12. Insert from the side. When the pressure contact surface 32 a of the flange portion 32 and the upper end surface 12 a (pressure contact surface) of the boss portion 12 are inserted until they are in close contact with the resin washer 20, the fitting portion 33 provided at the tip portion of the rotating shaft portion 31 and The male screw portion 34 protrudes downward from the lower end surface 12 b of the boss portion 12. After another resin washer 20 is attached thereto, the press contact ring 21 is fitted into the fitting portion 33. Subsequently, the pressure adjusting nut 22 is screwed into the male threaded portion 34 to press the pressure contact ring 21 against the boss portion 12 side, and the surface of the pressure contact ring 21 on the boss portion 12 side (also referred to as a pressure contact surface 21b) and the boss portion 12 below. The end face 12 b (pressure contact surface) is brought into close contact with the resin washer 20. Thereafter, the tightening degree of the pressure adjusting nut 22 may be adjusted so that the stay 7 can be rotated around the rotation shaft portion 31 with an appropriate force.

  By appropriately adjusting the pressure adjusting nut 22, the stay 7 can be rotated or fixed by the frictional resistance force between the pressure contact surface and the pressure contact surface without using a tool. Since the resin washer 20 is interposed between the pressure contact surface and the pressure contact surface, the frictional resistance is alleviated and the rotation of the stay 7 is stabilized.

  Since it rotates together with the rotating shaft portion 31, the pressure contact ring 21 rotates integrally with the pressure adjusting nut 22, and even when the stay 7 is repeatedly rotated, it is possible to suppress the pressure adjusting nut 22 from loosening.

The adjustment when the pressure adjusting nut 22 is loosened can be easily performed because only the tightening degree of one pressure adjusting nut 22 is changed, and the workability is excellent. Since the force by tightening the pressure adjusting nut 22 is applied almost uniformly to the resin washer 20, uneven wear of the resin washer 20 can be prevented, and the durability is excellent. Even if the resin washer 20 is broken, the stay 7 can be supported by bringing the pressure contact surface and the pressure contact surface into close contact with each other, so that it can be used as soon as possible.
(Modification)
FIG. 5 shows a modification of the present embodiment. In the mirror of this embodiment, a pressure adjusting bolt 40 is used instead of the pressure adjusting nut 22. Since other configurations are the same as those in the previous embodiment, the same components are denoted by the same reference numerals and description thereof is omitted (the same applies to other modified examples described later).

  Specifically, instead of the male screw portion 34, a fastening hole 41 a extending in the axial direction is formed on the front end surface of the shortened fitting portion 33, and the female screw portion 41 is provided. A female screw is formed in the fastening hole 41a. And it is comprised so that the press-contact ring 21 may be pressed on the boss | hub part 12 side by screwing the pressure regulation volt | bolt 40 in this internal thread part 41. FIG.

  According to the mirror of this embodiment, since the tip of the male screw portion 34 is not exposed at the lower end of the stay 7, the appearance is improved and inadvertent catching can be prevented.

  FIG. 6 shows another modification. In the mirror of this embodiment, a cylindrical resin bush is attached to the shaft hole 15 of the boss portion 12.

  Specifically, instead of one resin washer 20, a resin having a cylindrical bush portion 50a (resin bush) and an annular washer portion 50b projecting in a flange shape from one end edge of the bush portion 50a. A member 50 (buffer member) is used. The inner diameter of the bush portion 50a is formed to be the same as or slightly smaller than the outer diameter of the rotating shaft portion 31 (intermediate fit). The material of the resin member 50 is the same as that of the resin washer 20 described above. The shaft hole 15 here has a larger diameter than the rotation shaft portion 31 and is formed so that the bush portion 50a can be press-fitted.

  The resin member 50 is press-fitted into the shaft hole 15 from one of the upper and lower end surfaces 12a, 12b of the boss portion 12. Then, the resin washer 20 is disposed on the other end surface of the boss portion 12, the rotating shaft portion 31 is inserted into the shaft hole 15 into which the resin member 50 is press-fitted, and the pressure adjusting nut 22 is tightened.

  According to the mirror of this embodiment, there is almost no gap between the shaft hole 15 and the rotation shaft portion 31, so that the rotation of the stay 7 is smooth. If the resin member 50 is press-fitted from the upper end surface 12a of the boss portion 12, when the stay 7 is assembled to the mounting member 8, it is not necessary to attach the resin washer 20 to the stay 7 side. is there.

  The mirror according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

  For example, the rotation restricting portion only needs to rotate the pressure contact ring 21 and the rotation shaft portion 31, and has an uneven shape formed on each of the inner surface of the pressure contact ring 21 and the outer surface of the rotation shaft portion 31. There may be. The resin bush may be attached to the shaft hole 15 separately from the resin washer 20 instead of being used instead of the one resin washer 20 like the resin member 50. The buffer member is not limited to a resin washer. For example, it may be a metal piece having elasticity in the axial direction, such as a metal washer having a bulged central portion.

4 Cab 5 Side mirror 6 Mirror body 7 Stay 8 Mounting member 11 Base portion 12 Boss portion 12a Upper end surface 12b Lower end surface 15 Shaft hole 20 Resin washer (buffer member)
21 Pressure ring (Pressure contact member)
22 Pressure adjusting nut (fastening member)
31 Rotating shaft portion 32 Gutter portion 33 Fitting portion 34 Male screw portion 40 Pressure adjusting bolt (fastening member)
41 Female thread part 50 Resin member 50a Bush part 50b Washer part

Claims (4)

A mirror attached to a work machine,
Mirror body ,
A stay for supporting the mirror body ;
An attachment member that supports the stay and is attached to the vehicle;
With
The mounting member is
Bearing parts in which pressure contact surfaces parallel to each other are formed at both ends;
A shaft hole penetrating the bearing portion perpendicular to the pressure contact surface;
Have
The stay
A rotation shaft portion that has a fitting portion at a tip portion and is inserted so that the tip portion projects into the shaft hole;
A flange that protrudes larger than the inner diameter of the shaft hole from the base end portion of the rotating shaft portion;
Have
The buffer member is attached so as to contact the pressure contact surface,
The fitting portion is fitted to a fitting hole formed in the center at a tip portion of the rotating shaft portion protruding from the shaft hole and having a diameter larger than the inner diameter of the shaft hole. The rotating pressure contact member is fitted,
Wherein the distal end portion of the rotating shaft portions have concluded member is fastened,
The outer diameter of the pressure contact member is not less than the outer diameter of the fastening member,
The working machine mirror , wherein the pressure contact member is pressed against the bearing portion side by the fastening member in contact with the surface . A work machine mirror according to claim 1,
A mirror for a working machine in which an annular resin washer is used for the buffer member. A mirror for a work machine according to claim 1 or 2,
A mirror for a working machine in which a bolt is used for the fastening member. It is a mirror for working machines as described in any one of Claims 1-3,
A mirror for a work machine in which a cylindrical resin bush is attached to the shaft hole.

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