JP2015044546A - Mirror mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mirror mounting device, which can easily adjust an arm angle, can be realized in a more compact size than conventional ones, and requires less components than conventional ones.SOLUTION: A mirror mounting device 20 comprises a rotation regulating mechanism 30 and a stationary base mounting nut 71 (fastening member) that fastens a bracket 21 and the rotation regulating mechanism 30. The rotation regulating mechanism 30 comprises a stationary base 40 fixed to the bracket 21 with the stationary base mounting nut 71 and a rotary base 50, which can rotate about a shaft 25 relative to the stationary base 40 and to which an arm 23 is fixed. The stationary base mounting nut 71 is mounted around the shaft 25. The stationary base mounting nut 71 fixes a mounting angle of the stationary base 40 around the shaft 25 relative to the bracket 21 at an arbitrary angle.

Description

  The present invention relates to a mirror mounting apparatus for mounting a mirror on a mounted portion.

  Conventionally, there are tiltable mirrors (for example, Patent Documents 1 to 3). The retractable mirror is attached to the attachment portion via a mirror attachment device. This mirror mounting device supports the mirror with respect to the mounted portion so that the mirror can be changed between the use state and the storage state.

  Patent Documents 1 and 2 describe an arm that supports a mirror that can be rotated and fixed at an arbitrary angle with respect to a mounted portion. For example, in the thing of patent document 1 (FIG. 2), the press-contact ring (21) is pressed on the boss | hub part (12) side via the resin washer (20). Thereby, the stay (7) can be rotated and fixed with respect to the attachment member (8). In this technique, the angle of the arm with respect to the attached portion (arm angle) is set at an arbitrary angle. Therefore, when the mirror is changed (returned) from the retracted state to the used state, the arm angle is finely adjusted to return to the arm angle before the mirror is retracted (the arm angle when the mirror was last used, “original arm angle”). There is a need. This adjustment is complicated because it is necessary every time the mirror is changed from the storage state to the use state.

  On the other hand, paragraph [0032] of Patent Document 3 describes that “the mirror position can be easily moved, locked at that position, and easily returned to the original position again”. ing.

JP 2011-74641 A JP 2006-182088 A JP 2005-206002 A

  With the technique described in Patent Document 3, the arm angle can be returned to the “original arm angle”, but fine adjustment of the arm angle is difficult (or impossible). The details of this problem are as follows. Paragraph [0029] of Patent Document 3 states that “a plurality of recesses (24a) arranged around the axis (Z) and a sphere (24b) interposed between the pair of recesses (24a), “The mirror mounting member (22) is locked at an interval of 30 ° equally at 12 locations in the circumferential direction”. In this configuration, it is difficult to set the arm angle to an angle other than the “30 ° interval”. This is because the base (20b) in which the recess (24a) described in FIG. 5 of the same document is formed is inclined with respect to the support member (14a) by the inclined surfaces (F, F) of FIG. It is because it is fixed so that rotation is impossible. With this technique, since it is difficult to finely adjust the arm angle, it may be difficult to adjust the mirror angle to an optimum angle for the mirror user.

  In the technique described in Patent Document 3, a space for arranging the base (20b) having the inclined surfaces (F, F) is required. Moreover, in the technique described in Patent Document 3, a part having an inclined surface (F, F) is required, and the number of parts may increase.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mirror mounting device that can easily finely adjust an arm angle, can save space as compared with the prior art, and can reduce the number of parts as compared with the prior art.

  The mirror mounting device of the present invention includes a bracket fixed to a mounted portion, an arm that is rotatable with respect to the bracket and to which a mirror is mounted, connects the bracket and the arm, and the arm with respect to the bracket. A shaft that serves as a rotation axis of the shaft, a rotation restriction mechanism that is attached to the shaft and that can restrict the rotation of the arm around the shaft, and a fastening member that fastens the bracket and the rotation restriction mechanism. Is provided. The rotation restricting mechanism includes a fixed base fixed to the bracket by the fastening member, and a rotation base that is rotatable about the shaft with respect to the fixed base and to which the arm is fixed. . The rotation restricting mechanism restricts the rotation of the rotation base with respect to the fixed base when the rotation angle of the rotation base with respect to the fixed base is a predetermined angle, and the rotation angle is other than the predetermined angle. It is comprised so that the said regulation may be canceled at the time of. The predetermined angle is set discontinuously. The fastening member is attached to the shaft, and fixes an attachment angle of the fixing base around the shaft with respect to the bracket at an arbitrary angle.

  With the configuration described above, the arm angle can be easily finely adjusted, space can be saved as compared with the prior art, and the number of components can be reduced as compared with the prior art.

It is a figure which shows a cab provided with the mirror attachment apparatus 20 of 1st Embodiment. It is a half sectional view which shows the mirror attachment apparatus 20 shown in FIG. It is a figure which shows the shaft 25 and the fixed base 40 which are shown in FIG. (A): It is the IVa arrow line view of FIG. (B): It is the IVb arrow directional view of FIG. (A): It is a figure which shows the rotation base 50 shown in FIG. (B): It is a Vb arrow line view of Fig.5 (a). (C): It is a Vc arrow line view of Fig.5 (a). FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment. It is a figure which shows the shaft 25 and the fixed base 240 which are shown in FIG. (A): It is a VIIIa arrow directional view of FIG. (B): It is a VIIIb arrow line view of FIG. (A): It is a figure which shows the rotation base 250 shown in FIG. (B): It is an IXb arrow directional view of Fig.9 (a). (C): It is an IXc arrow directional view of Drawing 9 (a).

(First embodiment)
With reference to FIGS. 1-5 (c), the cab 1 provided with the mirror attachment apparatus 20 of 1st Embodiment shown in FIG. 1 is demonstrated.

  The cab 1 is a cab of a work machine. This work machine is, for example, a construction machine that performs construction work, and is, for example, a traveling type, for example, an excavator. This work machine may be transported on a transport vehicle (not shown). The cab 1 includes a cab body 11 (attached part), a handrail 13, a mirror 15, and a mirror mounting device 20.

  The cab main body 11 (attached part) is a main body of the cab 1 and is a box-shaped part. The cab body 11 includes a front surface 11f, a rear surface 11r, and two side surfaces 11s. The front surface 11f and the rear surface 11r are substantially opposed to each other. The two side surfaces 11s connect the front surface 11f and the rear surface 11r. One of the two side surfaces 11s includes a door 12. Here, a direction in which the front surface 11f and the rear surface 11r face each other (a direction substantially orthogonal thereto) is defined as a front-rear direction. In the front-rear direction, the front surface 11f side is the front side, and the rear surface 11r side is the rear side. A direction orthogonal to the side surface 11s is defined as a horizontal direction.

  The handrail 13 is a handrail used when an operator (operator) of the work machine gets on and off the cab 1. The handrail 13 is disposed in front of the front end portion of the door 12.

  The mirror 15 is a mirror for the operator of the work machine to see the rear side from the cab 1. The mirror 15 is attached to the cab body 11 via the mirror attachment device 20. The mirror 15 is disposed in the vicinity of the upper end portion of the handrail 13. The mirror 15 is disposed in the vicinity of the front end portion of the cab body 11. The mirror 15 is disposed in the vicinity of the outer end of the cab body 11 in the lateral direction (side where the door 12 is disposed). The mirror 15 is retractable (can be stored).

  The mirror mounting device 20 connects the cab main body 11 and the mirror 15. The mirror attachment device 20 is a device for attaching the mirror 15 to the cab body 11 so as to be retractable. The mirror mounting device 20 supports the mirror 15 so as to protrude laterally outward from the cab body 11 when the mirror 15 is in use. The mirror mounting device 20 supports (stores) the mirror 15 along the side surface 11s of the cab body 11 when the mirror 15 is in the retracted state. By setting the mirror 15 in the retracted state, it is possible to prevent the mirror 15 from interfering with the conveyance when the work machine is conveyed. As shown in FIG. 2, the mirror mounting device 20 includes a bracket 21, an arm 23, a shaft 25, a rotation restricting mechanism 30, a base pressing mechanism 60, and a fixed base mounting mechanism 70.

  The bracket 21 is fixed to the cab body 11 as shown in FIG. The bracket 21 protrudes forward and laterally outward from the cab body 11. The bracket 21 is a member that connects the cab body 11 and the handrail 13, for example. The bracket 21 is fixed to the handrail 13. This fixing is, for example, fixing by welding. The bracket 21 may not be connected to the handrail 13 (a bracket dedicated to the mirror mounting device 20 may be used). The bracket 21 includes, for example, a plate-like portion, and is, for example, entirely plate-shaped, such as a bent plate. As shown in FIG. 2, the bracket 21 includes a shaft insertion hole 21a.

  The shaft insertion hole 21a is a hole into which the shaft 25 is inserted. The shaft insertion hole 21a penetrates in a direction orthogonal to the plate-like bracket 21 (for example, the vertical direction).

  As shown in FIG. 1, the arm 23 is a member to which the mirror 15 is attached. The arm 23 is an arm-shaped member. The arm 23 has a rod shape, for example, and is formed by bending a linear rod, for example. As shown in FIG. 2, the arm 23 is attached to the bracket 21 via the shaft 25 and the rotation restricting mechanism 30. The arm 23 is configured to be rotatable with respect to the bracket 21 (described later). The arm 23 includes a mirror mounting portion 23a shown in FIG. 1 and a base end portion 23b shown in FIG.

  The mirror attaching part 23a is a part to which the mirror 15 is attached as shown in FIG. The mirror 15 is fixed to the mirror mounting portion 23a by, for example, a bolt (not shown). The mirror mounting portion 23 a is disposed at, for example, the front end portion of the arm 23 and is disposed at, for example, the lower end portion of the arm 23.

  As shown in FIG. 2, the base end portion 23b is an end portion of the arm 23 opposite to the mirror mounting portion 23a (see FIG. 1). The base end portion 23 b is attached to the rotation restricting mechanism 30. The base end portion 23b is fixed to a rotation base 50 (described later).

  The shaft 25 connects the bracket 21 and the arm 23. The shaft 25 extends in a direction orthogonal to the plate-like bracket 21. The shaft 25 protrudes upward (including substantially upward) from the bracket 21. The shaft 25 is inserted into the shaft insertion hole 21a. A central axis of the shaft 25 is defined as a shaft axis 25a. The shaft 25 (shaft shaft 25 a) serves as a rotation shaft of the arm 23 with respect to the bracket 21. The shaft 25 includes screw portions at both ends in the direction of the shaft axis 25a. The shaft 25 includes a lower screw portion 25b provided at the lower end portion of the shaft 25 and an upper screw portion 25t provided at the upper end portion of the shaft 25.

  The rotation restriction mechanism 30 is configured to be able to restrict the rotation of the arm 23 around the shaft 25. The rotation restricting mechanism 30 is configured such that when the mirror 15 (see FIG. 1) is changed from the stored state to the used state, the arm angle (described later) can be easily returned to the state before the mirror 15 is stored. . The arm angle is an angle (arrangement) of the arm 23 with respect to the bracket 21 when viewed from the direction of the shaft axis 25a. The arm angle is a so-called projecting angle of the arm 23 with respect to the cab body 11 (see FIG. 1). The rotation restricting mechanism 30 is attached to the shaft 25. Details of the operation of the rotation restricting mechanism 30 will be described later. The rotation restriction mechanism 30 includes a sphere 31, a fixed base 40, and a rotation base 50.

  The spherical body 31 is a member for restricting the rotation of the rotation base 50 with respect to the fixed base 40. The spherical body 31 is also a member that facilitates the rotation of the rotation base 50 with respect to the fixed base 40. The spherical body 31 is a steel ball, for example.

  The fixed base 40 is fixed to the bracket 21 by a fixed base mounting nut 71 (fastening member) (described later). The fixed base 40 is disposed above the bracket 21. As shown in FIG. 3, the fixed base 40 is fixed to the shaft 25. As shown in FIGS. 4A and 4B, the fixed base 40 is, for example, cylindrical. As shown in FIG. 3, the fixed base 40 includes a hole 41 into which the shaft 25 is inserted, a rotating base facing surface 43, a recess 44, a bracket contact surface 45, a welding groove 46, a welding portion 47, Is provided.

  The rotation base facing surface 43 is a surface on the side facing the rotation base 50 in the surface of the fixed base 40 shown in FIG. As shown in FIG. 3, the rotation base facing surface 43 is, for example, the upper surface of the fixed base 40.

  The recess 44 is formed in the rotation base facing surface 43. The recess 44 is formed so that a part (for example, substantially lower half) of the sphere 31 can be fitted therein. The recessed portion 44 is recessed on the opposite side (for example, the lower side) of the turning base 50 (see FIG. 2) with respect to the turning base facing surface 43. The recess 44 has a shape in which, for example, a cylinder is removed from the rotating base facing surface 43, and may have a shape in which, for example, a hemisphere is removed (not shown). The number of the recesses 44 (the same applies to the recesses 54 described later) is the same as, for example, the sphere 31, and may be larger than, for example, the sphere 31. The number of the recesses 44 is one or more, for example, 4 in the example shown in FIG. As shown in FIG. 4A, when viewed from the direction of the shaft axis 25a, the plurality of concave portions 44 are discontinuously arranged (with a space) on the circumference of one circle centered on the shaft axis 25a. (The same applies to the recess 54 described later). For example, when viewed from the same direction, the plurality of recesses 44 are arranged at equal intervals on the circumference, and when the number of recesses is 4, they are arranged at 90 ° intervals.

  The bracket contact surface 45 (see FIG. 3) is a surface that contacts the bracket 21 among the surfaces of the fixed base 40 shown in FIG. As shown in FIG. 3, the bracket contact surface 45 is, for example, the lower surface of the fixed base 40.

  The welding groove 46 is formed on the bracket contact surface 45. The welding groove 46 is provided in a portion adjacent to the shaft 25. The welding groove 46 is recessed on the opposite side (for example, the upper side) of the bracket contact surface 45 from the bracket 21 (see FIG. 2). As shown in FIG. 4B, the welding groove 46 is formed, for example, in a circular shape when viewed from the direction of the shaft axis 25a.

  As shown in FIG. 3, the welded portion 47 is a portion that fixes the fixed base 40 and the shaft 25. The welded portion 47 is formed by welding the fixed base 40 and the shaft 25. The welded portion 47 is disposed inside the welding groove 46. The welded portion 47 is preferably disposed only inside the welding groove 46. It is preferable that the welding part 47 does not protrude from the bracket contact surface 45 to the bracket 21 side (for example, the lower side). Note that the fixing base 40 and the shaft 25 may not be fixed by welding, for example, fixing by screws (not shown).

  As shown in FIG. 2, the rotation base 50 is configured to be rotatable around the shaft 25 (shaft shaft 25 a) with respect to the fixed base 40. The rotation base 50 is a member to which the arm 23 is fixed. The rotation base 50 is attached to the shaft 25. The rotation base 50 is disposed on the opposite side (for example, the upper side) of the bracket 21 with respect to the fixed base 40. As shown in FIGS. 5B and 5C, the rotation base 50 has a cylindrical shape, for example. As shown in FIG. 5A, the rotation base 50 includes a hole 51 into which the shaft 25 (see FIG. 2) is inserted, a fixed base facing surface 53, a recess 54, a base pressing mechanism arrangement surface 55, a lower surface. Side spring receiving portion 56.

  The fixed base facing surface 53 is a surface (for example, a lower surface) facing the fixed base 40 in the surface of the rotating base 50 shown in FIG.

  The recess 54 is formed on the fixed base facing surface 53 as shown in FIG. The recess 54 is formed so that a part of the sphere 31 (for example, the periphery of the upper end) can be fitted. The recessed portion 54 is recessed on the opposite side (for example, the upper side) to the fixed base 40 (see FIG. 2) with respect to the fixed base facing surface 53. The concave portion 54 has a shape in which, for example, a cylinder is removed from the fixed base facing surface 53, and may have a shape in which, for example, a substantially hemisphere (spherical notch) is removed (not shown).

  The base pressing mechanism arrangement surface 55 is a surface on the side (for example, the upper side) on which the base pressing mechanism 60 is arranged in the surface of the rotation base 50 shown in FIG.

  The lower spring receiving portion 56 is a portion that receives a base pressing spring 61 (described later) of the base pressing mechanism 60 (the base pressing spring 61 contacts). As shown in FIG. 5A, the lower spring receiving portion 56 is formed on the base pressing mechanism arrangement surface 55. The lower spring receiving portion 56 is recessed on the opposite side (for example, lower side) of the base pressing mechanism 60 (see FIG. 2) with respect to the base pressing mechanism arrangement surface 55. As shown in FIG. 5C, the lower spring receiving portion 56 is, for example, a circular groove.

  As shown in FIG. 2, the base pressing mechanism 60 presses the rotation restricting mechanism 30 in a direction in which the fixed base 40 and the rotation base 50 approach each other. The base pressing mechanism 60 presses the rotating base 50 toward the fixed base 40 (for example, downward). The base pressing mechanism 60 presses the rotation base 50 in the direction of the shaft axis 25a. The base pressing mechanism 60 is disposed, for example, above the rotation restricting mechanism 30, and is disposed, for example, above the rotation base 50. The base pressing mechanism 60 is attached to the shaft 25, disposed along the shaft 25, and disposed outside the shaft 25. The base pressing mechanism 60 is configured to be able to set a predetermined torque Ts of an arm torque T described later. The base pressing mechanism 60 includes a base pressing spring 61, an upper spring receiving portion 63, and a base pressing nut 65.

  The base pressing spring 61 applies an elastic force to the rotating base 50 in the direction of the shaft axis 25a. The lower end portion of the base pressing spring 61 is in contact with (received by and supported by) the lower spring receiving portion 56 of the rotation base 50. The base pressing spring 61 is a coil spring into which the shaft 25 is inserted.

  The upper spring receiving portion 63 is a portion with which the upper end portion of the base pressing spring 61 comes into contact (receives and supports). The upper spring receiving portion 63 is disposed, for example, above the upper end portion of the base pressing spring 61. The upper spring receiving portion 63 is a washer into which the shaft 25 is inserted.

  The base pressing nut 65 can adjust the magnitude of the force (pressing force) by which the base pressing mechanism 60 presses the rotation restricting mechanism 30, and the magnitude of the force (pressing force) by which the base pressing spring 61 presses the rotating base 50. The height can be adjusted. The base pressing nut 65 determines the distance between the rotating base 50 and the upper spring receiving portion 63. As a result, the length of the base pressing spring 61 is determined, and as a result, the magnitude of the pressing force is determined. The base pressing nut 65 is disposed, for example, above the upper spring receiving portion 63. The base pressing nut 65 is attached (fastened) to the upper screw portion 25t of the shaft 25. The base pressing nut 65 can be screwed and screwed along the direction of the shaft axis 25a. The base pressing nut 65 is provided so as to be securely fixed to the shaft 25, and specifically, for example, two are provided. The number of base pressing nuts 65 may be one.

  The pressing force can be easily finely adjusted by the base pressing nut 65 and the base pressing spring 61. More specifically, the amount of change in the “pressing force” with respect to the amount of movement of the base pressing nut 65 in the direction of the shaft axis 25a is compared with the case where the base pressing nut 65 directly presses the rotating base 50 (without the base pressing spring 61). Can be reduced by the base pressing spring 61.

  The fixed base attachment mechanism 70 attaches and fixes the arm 23, the shaft 25, the rotation restriction mechanism 30, and the base pressing mechanism 60 (referred to as “assemblies 23 to 65”) to the bracket 21. The fixed base attachment mechanism 70 is disposed on the opposite side (for example, the lower side) from the rotation restriction mechanism 30 with respect to the bracket 21. The fixed base attachment mechanism 70 is attached to the shaft 25. The fixed base mounting mechanism 70 includes a fixed base mounting nut 71. The fixed base attachment mechanism 70 may include a spring washer 73 and a flat washer 75.

  The fixed base mounting nut 71 (fastening member) fastens the bracket 21 and the rotation restricting mechanism 30. The fixed base mounting nut 71 fixes the fixed base 40 to the bracket 21. The fixed base mounting nut 71 is configured to be able to finely adjust an arm angle (an angle around the shaft axis 25a of the arm 23 with respect to the bracket 21). The fixed base mounting nut 71 fixes the mounting angle of the fixed base 40 around the shaft 25 (more specifically, around the shaft axis 25a) to the bracket 21 at an arbitrary angle. The “arbitrary angle” is one angle selected from a continuous angle range. The “arbitrary angle” can be changed after the mirror mounting device 20 is manufactured (not at the time of design but after manufacture). The “continuous angle range” is, for example, 360 degrees, and may be, for example, less than 360 degrees. The operator or the like of the work machine tightens and loosens the fixed base mounting nut 71, so that the arm angle is set to an arbitrary angle (such as an optimum angle for the operator). The nominal diameter of the fixed base mounting nut 71 is, for example, M14 or M16. When the fixed base mounting nut 71 of M14 or M16 is tightened by standard tightening, the axial force of the shaft 25 is 1200 kg or more.

  The fixed base attaching nut 71 is attached (fastened) to the lower screw portion 25b of the shaft 25. The fixed base mounting nut 71 can be screwed and screwed in the direction of the shaft axis 25a. The fixed base 40 is fixed to the bracket 21 by sandwiching the bracket 21 between the fixed base mounting nut 71 and the fixed base 40. A spring washer 73 and a flat washer 75 may be provided between the fixed base mounting nut 71 and the bracket 21 (above the fixed base mounting nut 71 and under the bracket 21). The flat washer 75 can ensure the frictional force between the fixed base mounting mechanism 70 and the bracket 21.

(Operation of the rotation restricting mechanism 30)
The operation of the rotation restricting mechanism 30 will be described. A rotation angle around the shaft 25 (shaft shaft 25a) of the rotation base 50 with respect to the fixed base 40 is defined as a “rotation angle θ”. The rotation restriction mechanism 30 is configured so that the rotation angle θ is easily held at a predetermined angle (referred to as “predetermined angle θs”) without using a tool. The predetermined angle θs is set discontinuously. The “predetermined angle θs set discontinuously” is, for example, a plurality of predetermined angles θs that are set apart (with a gap), and is, for example, a predetermined angle θs that is set only one (not shown). . The rotation restricting mechanism 30 restricts and releases the rotation angle θ as follows.

  (Regulation) The rotation restriction mechanism 30 restricts the rotation of the rotation base 50 around the shaft 25 (shaft shaft 25a) relative to the fixed base 40 when the rotation angle θ is the predetermined angle θs. Here, the rotational torque of the arm 23 around the shaft 25 (shaft shaft 25a) is referred to as “arm torque T”. When the rotation angle θ is a predetermined angle θs and the arm torque T is equal to or less than a predetermined torque (referred to as “predetermined torque Ts”), the rotation restriction mechanism 30 moves the rotation base 50 with respect to the fixed base 40. Do not rotate. At this time, the sphere 31 fits into the recess 44 (see FIG. 3) and the recess 54 (see FIG. 5A). At this time, the sphere 31 is pressed against the recess 44 and the recess 54 by the base pressing mechanism 60. At this time, the sphere 31 cannot get over the recess 44 or the recess 54 (cannot be detached from the recess 44 or the recess 54).

  The predetermined torque Ts is set by the base pressing mechanism 60 as described above. The magnitude of the predetermined torque Ts is set as follows. The predetermined torque Ts is set so that the arm torque T easily exceeds the predetermined torque Ts when the arm 23 is rotated around the shaft 25 by a human hand. For example, the predetermined torque Ts is set so that the arm 23 does not rotate around the shaft 25 due to vibrations of the working machine during traveling or work. When the arm torque T exceeds the predetermined torque Ts, the sphere 31 gets over the recess 44 (see FIG. 3) or the recess 54 (see FIG. 5A). As a result, the restriction is released.

  (Restriction release) The rotation restriction mechanism 30 releases the restriction when the rotation angle θ is other than the predetermined angle θs. The rotation restricting mechanism 30 in a state where the restriction is released enables the rotation base 50 to rotate around the shaft 25 (shaft shaft 25a) with respect to the fixed base 40 even when the arm torque T is equal to or less than the predetermined torque Ts. At this time, the sphere 31 is not fitted into the recess 44 (see FIG. 3) or the recess 54 (see FIG. 5A) (not shown). At this time, the sphere 31 can roll on the rotation base facing surface 43 (see FIG. 3) or the fixed base facing surface 53 (FIG. 5A).

The rotation restricting mechanism 30 has the following advantages compared to the slick type rotation restricting mechanism described in Patent Document 1 (hereinafter referred to as “slick mechanism”).
[Advantage a] In the rotation restriction mechanism 30, the rotation angle θ is restricted by a predetermined discontinuous angle θs. Therefore, when the mirror 15 is changed from the retracted state to the in-use state, it can be easily returned to the arm angle before the mirror 15 is stored (when the previous mirror 15 is used). On the other hand, in the slick mechanism, the rotation of the arm 23 is restricted only by the frictional force between the surfaces (the pressure ring (21), the resin washer (20), and the boss portion (12) in FIG. 2 of Patent Document 1). )reference). Therefore, the rotation angle θ is continuously restricted. Therefore, to return to the arm angle before storing the mirror 15, it is necessary to finely adjust the arm angle, and this adjustment is complicated.
[Advantage b] In the rotation restricting mechanism 30, the predetermined torque Ts necessary for rotating the arm 23 is easily set by the base pressing mechanism 60 using the base pressing spring 61. On the other hand, in the slick mechanism, it is difficult to adjust the torque (predetermined torque Ts) necessary for rotating the arm 23. The reason is as follows. [Reason b1] In the slick mechanism of Patent Document 1, the predetermined torque Ts is adjusted by adjusting the tightening force of the pressure adjusting nut (22). However, even if this tightening force is constant, if the uniformity of each surface (resin washer (20), etc.) is low, the frictional force generated on each surface will not be constant. Therefore, it is difficult to adjust the predetermined torque Ts. [Reason b2] Furthermore, in the slick mechanism of Patent Document 1, the pressure contact ring (21) is directly pressed by the pressure adjusting nut (22) (there is nothing corresponding to the base pressing spring 61 between them). Therefore, only a slight change in the tightening force results in a significant change in the frictional force, resulting in a large change in the predetermined torque Ts. Therefore, it is difficult to adjust the predetermined torque Ts.

(Installation of fixed base mounting nut 71)
The fixed base mounting nut 71 securely fixes the fixed base 40 (the shaft 25) to the bracket 21 (this fixing is referred to as “fixing A”). More specifically, the fixed base mounting nut 71 is fixed to prevent the fixed base 40 (shaft 25) and the rotating base 50 (arm 23) from rotating together when the arm 23 is rotated around the shaft 25. Do A. Specifically, the fixed base mounting nut 71 performs the fixing A so as to maintain the state in which the fixed base 40 is fixed to the bracket 21 when the arm torque T is equal to or less than the predetermined torque Ts. As a result, the fixing A is maintained as long as the fixed base mounting nut 71 is not loosened. The fixed base mounting nut 71 performs the fixing A so that a shaft mounting torque Tn, which will be described later, is larger than a predetermined torque Ts. The shaft mounting torque Tn is a torque necessary for releasing the fixing A, and is a torque necessary for rotating the shaft 25 around the shaft axis 25 a with respect to the bracket 21. Specifically, for example, when the predetermined torque Ts is set to 220 kg · cm or the like, the shaft mounting torque Tn is set to 1000 kg · cm or more, preferably 1200 kg · cm or more, for example. When the fixed base mounting nut 71 having a nominal diameter of M14 or M16 is tightened as a standard, the shaft mounting torque Tn is about 1200 kg · cm or more.

(Effect 1)
Next, effects of the mirror mounting device 20 shown in FIG. 1 will be described. The mirror mounting device 20 includes a bracket 21 fixed to the cab body 11 (attached portion), an arm 23 that is rotatable with respect to the bracket 21 and to which the mirror 15 is mounted, and as shown in FIG. The bracket 21 and the arm 23 are connected to each other, a shaft 25 serving as a rotation axis of the arm 23 with respect to the bracket 21, a rotation restricting mechanism 30 attached to the shaft 25 and capable of restricting the rotation of the arm 23 around the shaft 25, and the bracket 21 and a fixed base mounting nut 71 (fastening member) that fastens the rotation restricting mechanism 30. The rotation restricting mechanism 30 includes a fixed base 40 that is fixed to the bracket 21 by a fixed base mounting nut 71, and a rotation base 50 that can be rotated around the shaft 25 with respect to the fixed base 40 and to which the arm 23 is fixed. And comprising.
[Configuration 1-1] The rotation restricting mechanism 30 restricts the rotation of the rotation base 50 with respect to the fixed base 40 when the rotation angle θ of the rotation base 50 with respect to the fixed base 40 is a predetermined angle θs. The restriction is released when the moving angle θ is other than the predetermined angle θs. The predetermined angle θs is set discontinuously.
[Configuration 1-2] The fixed base mounting nut 71 is mounted on the shaft 25.
[Configuration 1-3] The fixed base mounting nut 71 fixes the mounting angle of the fixed base 40 around the shaft 25 to the bracket 21 at an arbitrary angle.

  The mirror mounting device 20 includes the above [Configuration 1-1]. Therefore, the rotation of the rotation base 50 with respect to the fixed base 40 is restricted when the rotation angle θ is a predetermined discontinuous angle θs. As a result, the angle (arm angle) around the shaft 25 of the arm 23 with respect to the bracket 21 is regulated. Therefore, when the mirror 15 is changed from the retracted state to the in-use state, it can be easily returned to the arm angle before the mirror 15 is stored (when the mirror 15 is used last time). On the other hand, in the above [Configuration 1-1], the restriction is released when the rotation angle θ is other than the predetermined angle θs. Therefore, it may be difficult to set the rotation angle θ other than the predetermined angle θs. As a result, fine adjustment of the arm angle may be difficult only with the above [Configuration 1-1]. More specifically, it may be difficult to set the arm angle such that the rotation angle θ is an angle other than the predetermined angle θs.

  Therefore, the mirror mounting device 20 includes the above [Configuration 1-3]. Therefore, by adjusting the mounting angle of the fixed base 40 around the shaft 25 with respect to the bracket 21 by an arbitrary angle, fine adjustment of the arm angle (continuous angle adjustment) can be easily performed.

  The fixed base attaching nut 71 that fastens the bracket 21 and the rotation restricting mechanism 30 is attached to the shaft 25 (see [Configuration 1-2] above). Further, the shaft 25 serves as a rotation axis of the arm 23 with respect to the bracket 21. Therefore, the rotation shaft of the arm 23 and the fastening portion between the bracket 21 and the rotation restriction mechanism 30 are coaxial. Therefore, compared with the case where these are not provided coaxially (see the shaft (20a) and the nut (29) in FIG. 3 of Patent Document 3), it is possible to save the space of the mirror mounting device 20.

  The fixed base attaching nut 71 that fastens the bracket 21 and the rotation restricting mechanism 30 is attached to the shaft 25 (see [Configuration 1-2] above). Therefore, it is not necessary to provide a member different from the shaft 25 in order to fasten the bracket 21 and the rotation restricting mechanism 30. Therefore, the number of parts of the mirror mounting device 20 can be reduced. The “other member” is, for example, the support member (14 a) including the inclined surfaces (F, F) described in FIGS. 6B and 6C of Patent Document 3 described above.

(Effect 2)
[Configuration 2-1] The fixed base 40 is fixed to the shaft 25.
[Configuration 2-2] The bracket 21 includes a shaft insertion hole 21a into which the shaft 25 is inserted.
[Configuration 2-3] The fixed base mounting nut 71 fixes the fixed base 40 to the bracket 21 by sandwiching the bracket 21 between the fixed base mounting nut 71 and the fixed base 40.

  The mirror mounting device 20 includes the above [Configuration 2-1]. Therefore, adjustment of the rotation angle of the fixed base 40 with respect to the shaft 25 is unnecessary (impossible). Therefore, an operator (one who performs fine adjustment of the arm angle) does not need to consider the rotation angle of the fixed base 40 with respect to the shaft 25. Therefore, fine adjustment of the arm angle can be easily performed.

  The mirror mounting device 20 includes the above [Configuration 2-2] and [Configuration 2-3]. In this configuration, in order to fix [Configuration 2-3], the bracket 21 only needs to include the shaft insertion hole 21a (the above [Configuration 2-2]). More specifically, the bracket 21 does not need to have a shape like the support member (14a) provided with the inclined surfaces (F, F) described in FIGS. 6B and 6C of Patent Document 3 described above. . Therefore, the degree of freedom of the shape of the bracket 21 is high.

(Effect 3)
The fixed base 40 includes a bracket contact surface 45 (see FIG. 3) that contacts the bracket 21, a welding groove 46 formed on the bracket contact surface 45, and is formed on the inner side of the welding groove 46 and the fixed base 40 and the shaft 25. And a welding portion 47 for fixing the two.

  In this configuration, the welded portion 47 is formed inside the bracket contact surface 45. Therefore, the bracket contact surface 45 (see FIG. 3) and the bracket 21 are easy to contact. Therefore, it is easy to ensure the frictional force between the bracket contact surface 45 (see FIG. 3) and the bracket 21. Therefore, the fixed base 40 is difficult to rotate with respect to the bracket 21. Therefore, the arm 23 whose rotation is restricted by the rotation restriction mechanism 30 is difficult to turn with respect to the bracket 21. Therefore, the angle (arm angle) around the shaft 25 of the arm 23 with respect to the bracket 21 is easily maintained.

(Second Embodiment)
With reference to FIGS. 6-9 (c), the difference with 1st Embodiment is demonstrated about the mirror attachment apparatus 220 of 2nd Embodiment.
[Difference 1] As shown in FIG. 2, the rotation restricting mechanism 30 of the first embodiment includes a sphere 31, a recess 44 (see FIG. 3) in which the sphere 31 can be fitted, and a recess 54 (FIG. 5). (See (a)). On the other hand, as shown in FIG. 6, the rotation restricting mechanism 230 of the second embodiment includes a convex portion 244 (see FIG. 7) and a concave portion 254 (see FIG. 9A) in which the convex portion 244 can be fitted. And).
[Difference 2] As shown in FIG. 6, the lower spring receiving portion 256 of the second embodiment is provided with a protrusion 256b with respect to the lower spring receiving portion 56 (see FIG. 2) of the first embodiment. It is a thing. Hereinafter, the difference will be further described.

  As shown in FIG. 6, the rotation restricting mechanism 230 includes a fixed base 240 and a rotation base 250. The rotation restricting mechanism 230 does not include the sphere 31 (see FIG. 2).

  As shown in FIG. 7, the fixed base 240 includes a convex portion 244. The fixed base 240 does not include the recess 44 (see FIG. 3).

  The convex portion 244 is a portion for restricting the rotation of the rotation base 250 (see FIG. 6) with respect to the fixed base 240. The convex portion 244 is provided on the rotation base facing surface 43. As shown in FIG. 7, the convex portion 244 protrudes from the rotation base facing surface 43 toward the rotation base 250 (see FIG. 6, for example, the upper side). The number of the convex portions 244 is one or a plurality, for example, four in the example shown in FIG. As shown in FIG. 8A, when viewed from the direction of the shaft axis 25a, the plurality of convex portions 244 are arranged in substantially the same manner as the concave portion 44 (see FIG. 4) described above, for example. Specifically, the plurality of convex portions 244 are discontinuously arranged (with intervals) on the circumference of one circle centered on the shaft shaft 25a. When viewed from the direction of the shaft axis 25a, the convex portion 244 (one convex portion 244) is, for example, a substantially square shape, for example, an arc shape or a shape combining straight lines, and also, for example, a circular shape (not shown). Good. As shown in FIG. 7, the convex portion 244 has, for example, a substantially truncated pyramid shape or a substantially mountain shape. Specifically, the shape of the convex portion 244 is a shape in which a cross section (not shown) viewed from the direction of the shaft shaft 25a becomes narrower as the distance from the rotation base facing surface 43 increases (for example, as it goes upward).

  As shown in FIG. 9A, the rotation base 250 includes a concave portion 254 and a lower spring receiving portion 256.

  The recess 254 is formed in the fixed base facing surface 53. The recessed portion 254 is recessed on the opposite side (for example, the upper side) to the fixed base 240 (see FIG. 6) with respect to the fixed base facing surface 53. As shown in FIG. 6, the concave portion 254 (see FIG. 9A) is formed so that the convex portion 244 (see FIG. 7) can be fitted therein. The concave portion 254 is formed so that the entire convex portion 244 or a part (substantially the entire portion) can fit therein. The number of concave portions 254 shown in FIG. 9B is the same as, for example, the convex portions 244 (see FIG. 8A), and may be larger than the convex portions 244 (not shown). In addition, you may reverse arrangement | positioning (not shown) of the convex part 244 (refer FIG. 7) and the recessed part 254 (refer FIG. 9) shown in FIG. Specifically, the fixed base 240 may include a concave portion, and the rotation base 250 may include a convex portion.

  As shown in FIG. 9A, the lower spring receiving portion 256 includes a groove portion 256a and a protruding portion 256b. The groove portion 256a is the same groove as the lower spring receiving portion 56 (see FIG. 2) of the first embodiment.

  As shown in FIG. 6, the protrusion 256b restricts the movement of the base pressing spring 61 in the direction orthogonal to the shaft axis 25a. As shown in FIG. 9A, the protrusion 256b protrudes from the base pressing mechanism arrangement surface 55 to the base pressing mechanism 60 side (see FIG. 6, for example, the upper side). As shown in FIG. 9C, when viewed from the direction of the shaft axis 25a (see FIG. 6), the protrusion 256b is provided on the outer peripheral portion of the groove 256a. When viewed from the same direction, the protrusion 256b is provided, for example, on the entire outer periphery (circular shape) of the groove 256a, or may be provided, for example, on a part of the outer periphery of the groove 256a (not shown).

(Operation)
The operation of the rotation restricting mechanism 230 illustrated in FIG. 6 will be described focusing on differences from the operation of the rotation restricting mechanism 30 (see FIG. 2) of the first embodiment.

(Regulation) The rotation restriction mechanism 230 rotates the rotation base 250 with respect to the fixed base 240 when the rotation angle θ described above is a predetermined angle θs and the arm torque T described above is equal to or less than the predetermined torque Ts. Do not move. At this time, the convex portion 244 (see FIG. 7) fits into the concave portion 254 (see FIG. 9A). At this time, the convex portion 244 and the concave portion 254 are pressed against each other in the direction of the shaft axis 25 a by the base pressing mechanism 60. At this time, the convex portion 244 cannot get over the concave portion 254 (cannot be detached from the concave portion 254). When the arm torque T exceeds the predetermined torque Ts, the convex portion 244 gets over the concave portion 254. As a result, the restriction is released.
(Restriction release) The rotation restriction mechanism 230 releases the restriction when the rotation angle θ is other than the predetermined angle θs. At this time, the convex portion 244 (see FIG. 7) does not fit into the concave portion 254 (see FIG. 9A) (not shown). At this time, the convex portion 244 can slide on the fixed base facing surface 53 (see FIG. 9A).

(Modification)
As shown in FIG. 1, in the said embodiment, the mirror 15 and the mirror attachment apparatus 20 were provided with the cab 1 of the working machine. However, the mirror 15 and the mirror mounting device 20 may be provided in a portion other than the cab 1 of the work machine, or may be provided in a machine other than the work machine.

11 Cab body (attached part)
DESCRIPTION OF SYMBOLS 15 Mirror 20, 220 Mirror mounting apparatus 21 Bracket 21a Shaft insertion hole 23 Arm 25 Shaft 30, 230 Rotation restriction mechanism 40, 240 Fixed base 45 Bracket contact surface 47 Welding groove 49 Welding part 50, 250 Rotating base 71 Fixed Base mounting nut (fastening member)

Claims (3)

A bracket to be fixed to the mounted portion;
An arm that is pivotable relative to the bracket and to which a mirror is attached;
A shaft that connects the bracket and the arm, and serves as a rotation axis of the arm with respect to the bracket;
A rotation restricting mechanism attached to the shaft and capable of restricting the rotation of the arm around the shaft;
A fastening member for fastening the bracket and the rotation restricting mechanism;
With
The rotation restricting mechanism is
A fixed base fixed to the bracket by the fastening member;
A pivot base that is pivotable about the shaft relative to the fixed base and to which the arm is fixed;
With
The rotation restricting mechanism restricts the rotation of the rotation base with respect to the fixed base when the rotation angle of the rotation base with respect to the fixed base is a predetermined angle, and the rotation angle is other than the predetermined angle. Configured to release the regulation at the time of
The predetermined angle is set discontinuously,
The fastening member is attached to the shaft, and an attachment angle around the shaft of the fixing base with respect to the bracket is fixed at an arbitrary angle.
Mirror mounting device. The fixed base is fixed to the shaft;
The bracket includes a shaft insertion hole into which the shaft is inserted,
The fastening member fixes the fixed base to the bracket by sandwiching the bracket between the fastening member and the fixed base.
The mirror mounting apparatus according to claim 1. The fixed base is
A bracket contact surface that contacts the bracket;
A welding groove formed on the bracket contact surface;
A welding portion formed inside the welding groove and fixing the fixed base and the shaft;
The mirror mounting apparatus according to claim 2, comprising: