JP6282519B2 - Mirror device for work vehicle - Google Patents

Description

  The present invention relates to a mirror device applied to a work vehicle, particularly a large crane vehicle to which a counterweight can be attached and detached.

  For example, a wheel crane such as a rough terrain crane is a vehicle that can travel on public roads in accordance with laws and regulations. For this reason, a rearview mirror is generally provided at the front end of the lower traveling body of a wheel crane, and the operator operates the crane from the driver's seat adjacent to the swivel and uses the rearview mirror device to secure the vehicle. Do the driving.

  FIG. 5 is a front view of a general rough terrain crane. (A) is a perspective view of a right-side rearview mirror device, and (b) is a perspective view of a left-side rearview mirror device.

  As shown in the figure, a right-side rearview mirror device 3 and a left-side rearview mirror device 4 are provided at the front end portion of the lower traveling body 2 of the rough terrain crane 1. Both the rearview mirror devices 3 and 4 can turn in the direction of the arrow on the side of the vehicle and lie down, as shown in FIGS. Thereby, for example, when the swivel base 5 is turned, the operator inverts both the rearview mirror devices 3 and 4 in advance, thereby preventing the boom 6 from interfering with the rearview mirror devices 3 and 4 (for example, Patent Documents). 1 and Patent Document 2).

JP-A-10-250990 JP 7-172240 A

  By the way, generally, rough terrain cranes are equipped with counterweights in accordance with the weight of the suspended load, and the counterweights are also exchanged in accordance with the weight of the suspended load. Also, especially in North American countries, rough terrain cranes cannot legally travel on public roads, and when the rough terrain crane moves to another site, the rough terrain crane is loaded on other vehicles such as trailers The At this time, when the counterweight is mounted on the rough terrain crane, the maximum load capacity of the trailer may be exceeded. In such a case, the counterweight is removed and loaded on a vehicle such as another trailer. .

  The counterweight is removed from the swivel 5 in the following manner.

  FIG. 6 is a perspective view of a main part of the rough terrain crane 1. The figure shows a front portion of the rough terrain crane 1 and shows a state in which the swivel base 5 is rotated 180 ° (degree). FIG. 7 is a partially enlarged perspective view of FIG.

  As shown in FIG. 6, first, the swivel base 5 rotates, and the counterweight 7 is placed on the front upper surface of the lower traveling body 2 by the hydraulic cylinder. Thereafter, the counterweight 7 is loaded on another trailer by another crane or the like. When the counterweight 7 is moved onto the lower traveling body 2, the rearview mirror devices 3 and 4 are operated in advance (see FIGS. 5 and 7) and fall down. This avoids interference with the rearview mirror devices 3 and 4 when the counterweight 7 moves, and the counterweight 7 is lowered smoothly (see FIG. 6).

  However, since the operator performs the fall work of the rearview mirror devices 3 and 4, it is considered that the rearview mirror devices 3 and 4 are not sufficiently fallen or the rearview mirror devices 3 and 4 are not fallen down in the first place. It is done. In such a case, since the counterweight 7 is a very heavy object, there is a problem that the rearview mirror devices 3 and 4 are immediately damaged when the counterweight 7 interferes with the rearview mirror devices 3 and 4. .

  The present invention has been made based on such a background, and its purpose is to automatically rotate and damage the counterweight as the counterweight moves when the counterweight is lowered from the swivel base to the lower traveling body. It is to provide a mirror device capable of avoiding the above with a simple structure at low cost.

  (1) A mirror device according to the present invention includes a lower traveling body, an upper working body mounted on the lower traveling body, and a counterweight detachably mounted on the upper working body, and the counterweight is removed. This is applied to a work vehicle in which the counterweight is lowered and temporarily placed on a predetermined portion on the lower traveling body. The mirror device includes a mirror body that can be viewed by an operator from a driver's cab of the lower traveling body, and the mirror body that moves the lower traveling body so that the operator can check the rear side of the lower traveling body. And a support that supports the bracket so that the mirror body can be displaced from the extended position to a separated position that is further away from the lower traveling body. And the bracket or the mirror main body, and when the counterweight being lowered contacts and receives an external force, the bracket or the mirror main body is given a component force in a direction away from the lower traveling body. And an assist member.

  According to this configuration, when the counterweight is lowered from the upper work body, the lowered counterweight may come into contact with the mirror device unless the mirror device is previously displaced to the separation position. Even when the descending counterweight comes into contact with the mirror device, the counterweight comes into contact with the assist member. When the assist member receives an external force from the counterweight, the bracket or the mirror body receives a force in a direction away from the lower traveling body from the assist member. Thereby, the mirror body is displaced from the protruding position to the separation position.

  (2) The bracket has a proximal end portion and a distal end portion, and the proximal end portion of the bracket is supported by the support portion so as to be rotatable about the front-rear direction of the lower traveling body, and the distal end portion of the bracket The mirror body may be held on the surface. And it is preferable that the said assist member has an inclination part fixed to the said bracket, and inclined in the vehicle width direction outer side from the said lower traveling body with respect to the perpendicular direction.

  In this configuration, the counterweight comes into contact with the inclined portion. When the inclined portion receives an external force vertically downward from the counterweight, the bracket or the mirror main body receives a force in a direction away from the lower traveling body from the assist member. In the present invention, simply by providing the assist member with the inclined portion, a force in a direction away from the lower traveling body is easily and inexpensively applied to the bracket or the mirror body.

  (3) The assist member may be formed of a straight rod-like member having one end fixed to the base end of the bracket and inclined outward in the vehicle width direction from the lower traveling body with respect to the vertical direction.

  In this configuration, the assist member has a very simple structure.

  (4) The assist member may include a leg portion that is provided at a tip of the bracket and extends upward, and umbrella portions that are provided on the leg portion and extend on both sides of the mirror body. And it is preferable that a part of said umbrella part inclines to the vehicle width direction outer side from the said lower traveling body with respect to the perpendicular direction.

  In this configuration, the assist member functions as a protection member for the mirror body. In addition, since the leg portion is provided at the tip of the bracket, the bracket can be easily displaced around the support portion when the bracket receives a force in a direction away from the lower traveling body. it can.

  According to the present invention, when the counterweight is removed, the counterweight to be lowered comes into contact with the assist member of the mirror device once it is placed on the lower traveling body. When the counter weight pushes the assist member, the mirror body is automatically displaced from the extended position to the separated position. That is, even if the operator of the work vehicle does not previously lay down the mirror device when removing the counterweight, damage to the mirror device in contact with the counterweight is prevented.

FIG. 1 is an external perspective view of a crane vehicle employing a rearview mirror device according to an embodiment of the present invention. 2 is an enlarged perspective view of a main part in FIG. FIG. 3 is a schematic diagram showing the behavior of the rearview mirror body when the counterweight is removed. FIG. 4 is a perspective view of a rearview mirror device according to a modification of the embodiment of the present invention. FIG. 5 is a front view of a conventional general rough terrain crane. FIG. 6 is a perspective view of a main part of a conventional rough terrain crane. FIG. 7 is a partially enlarged perspective view of FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate. This embodiment is only one aspect of the rearview mirror device according to the present invention (corresponding to the “mirror device” described in the claims), and the embodiment is within the scope of the present invention. Needless to say, it may be changed.

  FIG. 1 is an external perspective view of a crane vehicle employing a rearview mirror device according to an embodiment of the present invention.

  The crane 10 includes a lower traveling body 11 and an upper working body 12. The lower traveling body 11 has a lower frame 13, and a front axle 14, a first rear axle 15, and a second rear axle 16 are provided on the lower frame 13. A diesel engine 20 serving as a drive source for the front axle 14 and the rear axles 15 and 16 is mounted on the rear end of the lower frame 13. The wheels of the front axle 14 and the rear axles 15 and 16 are driven via a transmission (not shown) and are steered by a hydraulic cylinder (not shown).

  Further, a front outrigger 18 and a rear outrigger 19 are provided at the lower front end and the lower rear end of the lower frame 13, respectively. Accordingly, the lower traveling body 11 is stably grounded when the upper working body 12 is in operation. Further, a hydraulic pump that supplies hydraulic pressure to the hydraulic motor and the upper working body 12 is provided in the lower frame 13. The diesel engine 20 includes an engine body (not shown) and an engine cover that covers the engine body.

  The upper working body 12 has a boom device 23. The boom device 23 is attached to a swivel base 22, and the swivel base 22 is mounted on the lower frame 13 through a bearing so as to be turnable. The boom device 23 is connected to the swivel base 22 via a undulation center pin so as to be raised and lowered. The boom device 23 includes a telescopic boom 24. The telescopic boom 24 incorporates a telescopic cylinder (not shown), and expands and contracts when it is operated. The boom device 23 includes a winch 27 that is driven by a hydraulic motor. When the winch 27 is operated, the workpiece is moved up and down. A counterweight 28 is provided at the rear of the swivel base 22 for stable work of the upper working body 12. The counter weight 28 is detachable. Since the procedure for attaching and detaching the counterweight 28 is the same as the conventional one (see FIGS. 5 to 7), the description thereof is omitted.

  The lower traveling body 11 includes a cab 26 for performing the traveling operation of the crane 10 and the operation of the upper working body 12. The cab 26 is provided on the swivel base 22 and swivels together with the swivel base 22. A rearview mirror device 30 is provided at the front end of the lower traveling body 11. The structure of the rearview mirror device 30 will be described in detail later. The rearview mirror device 30 is visually recognized by an operator in the cab 26, and the operator can check the state of the rear side of the crane vehicle 10 via the rearview mirror device 30.

  A feature of the crane vehicle 10 according to the present embodiment is that the rearview mirror device 30 is mounted. A rearview mirror device 30 is attached to the front end portion of the lower traveling body 11. In the present embodiment, a pair of rearview mirror devices 30 are mounted symmetrically on the front surface 32 of the body of the lower traveling body 11 in front of the front axle 14.

  2 is an enlarged perspective view of a main part in FIG. The figure is a perspective view of the rearview mirror device 30 provided on the right side of the lower traveling body 11. Hereinafter, the structure of the right-side rearview mirror device 30 will be described. Since the left-side rearview mirror device has the same structure as the right-side rearview mirror device 30, the description thereof is omitted.

  The rearview mirror device 30 includes a rearview mirror main body 33 (corresponding to a “mirror main body” described in claims), a bracket 34 that supports the main body 33, a support portion 35 that supports the bracket 34, and a bracket 34. And an assist rod 36 (corresponding to an “assist member” recited in the claims). The rearview mirror device 30 can be rotationally displaced in the same manner as the conventional one (see FIG. 5). That is, the rearview mirror main body 33 is displaced from the protruding position (position shown in FIG. 2) to the separation position rotated in the direction of the arrow 37, and its posture changes. The operator of the crane vehicle 10 can change the attitude of the rearview mirror main body 33 as necessary. Here, the “extension position” is a position where the operator in the cab 26 can visually recognize the rearview mirror main body 33 and can confirm the situation behind the side surface of the lower traveling body 11. Further, the “separation position” is a position where the rearview mirror main body 33 is further rotated from the protruding position in the direction of the arrow 37 and separated from the lower traveling body 11 (see FIG. 3C).

  In this embodiment, the bracket 34 is a round bar as shown in FIG. Specifically, the bracket 34 includes a base end portion 38 supported by the support portion 35, a continuous portion 39 continuous with the base end portion 38, and a tip end portion 40 extending to the continuous portion 39. . The base end portion 38 is inserted into and supported by the support portion 35. The support portion 35 can rotate in the direction of the arrow 37 in a state where the base end portion 38 is supported. Since the structure of the support part 35 is known, the description thereof is omitted. Further, the central portion of the continuous portion 39 is bent so that the rearview mirror main body 33 is in the overhanging position in FIG.

  In the present embodiment, the rearview mirror body 33 has a substantially rectangular shape and includes a mirror on the surface. A mounting portion 42 is provided on the back surface 41 of the rearview mirror main body 33. The front end portion 40 of the bracket 34 is coupled to the mounting portion 42. Since the structure of the mounting portion 42 is also known, its description is omitted. Of course, the outer shape of the rearview mirror main body 33 is not limited to a rectangle, but may be a circle, an ellipse, or other shapes.

  The assist bar 36 is a straight round bar in this embodiment. As will be described later, the assist rod 36 is a member with which the counterweight 28 comes into contact, and therefore needs to have sufficient mechanical strength. In the present embodiment, the assist rod 36 is made of stainless steel. However, the assist rod 36 may be made of other materials.

  One end 43 of the assist rod 36 is fixed to the base end 38 of the bracket as shown in FIG. The assist rod 36 extends obliquely upward from the base end portion 38. Specifically, the assist rod 36 is inclined outward in the vehicle width direction with respect to the vertical direction so as to be separated from the lower traveling body 11.

  FIG. 3 is a schematic diagram showing the behavior of the rearview mirror main body 33 when the counterweight 28 is removed.

  As in the prior art (see FIG. 6), the swivel base 22 turns and the counterweight 28 is moved in front of the lower traveling body 11. Then, the counterweight 28 is lowered vertically from the upper working body 12 by a predetermined hydraulic device and placed on the lower traveling body 11. At this time, if the rearview mirror main body 33 has not been displaced to the separation position in advance, as shown in FIG. 3, the descending counterweight 28 contacts the rearview mirror device. Specifically, the counterweight 28 contacts the assist rod 36 (FIG. 3A).

  When the counterweight 28 is further lowered (FIG. 3B), the assist rod 36 receives an external force from the counterweight 28 in the downward direction in the vertical direction. Since the assist rod 36 is inclined as described above (see FIG. 3), the component force of the external force in the direction orthogonal to the assist rod 36 rotates the assist rod 36 counterclockwise in the drawing. That is, the bracket 34 rotates by receiving a force in a direction away from the lower traveling body 11 via the assist rod 36. Thereby, the rear-view mirror main body 33 is displaced from the protruding position (FIG. 3A) to the separation position (FIG. 3C).

  According to the rearview mirror device 30 according to the present embodiment, when the counterweight 28 is once placed on the lower traveling body 11, the lowered counterweight 28 comes into contact with the assist rod 36, so that the assist rod Together with 36, the rearview mirror main body 33 is automatically displaced from the extended position to the separated position. Therefore, even if the operator of the crane vehicle 10 does not lay down the rearview mirror device in advance when the counterweight 28 is removed, the rearview mirror device 30 in contact with the counterweight 28 is not damaged.

  In the present embodiment, the assist rod 36 is a straight member, but is not limited to such a shape. The cause of the assist rod 36 receiving the component force (component force in the direction perpendicular to the assist rod 36) by the descending counterweight 28 is that the assist rod 36 is inclined as shown in FIG. Then, the assist rod 36 does not have to be a straight rod-like member that is entirely inclined as in the present embodiment, but is an inclined portion for generating the above-described component force on at least a part of the assist rod 36 (claims). It is only necessary to provide an “inclined portion” described in the range. Similar to the assist rod 36, the inclined portion may be a portion that is inclined outward in the vehicle width direction from the lower traveling body 11 with respect to the vertical direction.

  Next, a modified example of this embodiment will be described.

  FIG. 4 is a perspective view of a rearview mirror device 50 according to a modification of the present embodiment. The figure is a perspective view of the rearview mirror device 30 provided on the right side of the lower traveling body 11. Also in this modification, the pair of rearview mirror devices 50 are arranged symmetrically, and only the right rearview mirror device 50 will be described below.

  The difference between the rearview mirror device 50 according to the present modification and the rearview mirror device 30 is that the rearview mirror device 30 includes the assist rod 36 formed of a straight round bar, whereas the rearview mirror device 50 according to the present modification is different from the rearview mirror device 30. The mirror device 50 is provided with an umbrella-type assist member 51 instead of the assist rod 36.

  As shown in FIG. 4, the assist member 51 is attached to the distal end portion 40 of the bracket 34. The assist member 51 includes a leg portion 52 that extends upward from the bracket 51 and an umbrella portion 53 that is continuous with the leg portion 52. These leg part 52 and umbrella part 53 consist of a round bar member, and both are formed integrally. The leg part 52 is a straight member. The umbrella portion 53 has a mountain shape so as to cover the upper portion of the rearview mirror main body 33, and is formed by bending the round bar member. The umbrella portion 53 has a top piece 54 that extends symmetrically continuously from the tip of the leg portion 52 and a pair of slant pieces 55 and 56 that are continuous to both ends of the top piece 54, respectively. A part of the oblique piece 55 is inclined with respect to the vertical direction. This inclination direction is the same as the inclination direction of the assist rod 36 according to the embodiment.

  In this modification, the inclined portion of the oblique piece 55 corresponds to the assist rod 36 according to the embodiment. Accordingly, when the counterweight 28 is lowered and contacts the assist member 51, the assist member 51 receives an external force from the counterweight 28 in the downward direction in the vertical direction. Since the oblique piece 55 of the assist member 51 is inclined as described above, the component force of the external force in the direction perpendicular to the oblique piece 55 rotates the assist member 51 counterclockwise in the figure. That is, the rearview mirror body 33 is displaced from the protruding position to the separation position.

  In the present embodiment, a pair of rearview mirror devices 30 are mounted symmetrically on the front end of the lower traveling body 11, that is, in front of the front axle 14, on the front surface 32 of the body of the lower traveling body 11. However, it goes without saying that the embodiment of the present invention is not limited to such a rearview mirror device 30. That is, the present invention can be implemented as a side mirror device or an under mirror device for confirming the lower side of the lower traveling body.

DESCRIPTION OF SYMBOLS 10 ... Mobile crane 11 ... Lower traveling body 12 ... Upper work body 13 ... Lower frame 26 ... Driver's cab 28 ... Counterweight 30 ... Rearview mirror device 32 ... Front 33 ... Rearview mirror main body 34 ... Bracket 35 ... Supporting part 36 ... Assist rod 38 ... Base end part 39 ... Continuous part 40 ... Tip part 43 ... One end part 50 ... Rearview mirror device 51 ... Assist member 52 ... Leg part 53 ... Umbrella part 54 ... Top piece 55 ... Oblique piece 56 ... Oblique piece

Claims (4)

A lower traveling body, an upper working body mounted on the lower traveling body, and a counterweight detachably mounted on the upper working body, and the counterweight is lowered when the counterweight is removed. A mirror device applied to a work vehicle once mounted on a predetermined part on a lower traveling body,
A mirror body that the operator can visually recognize from the cab of the lower traveling body,
A bracket that is arranged at an overhanging position in which the mirror body projects outward from the lower traveling body in the vehicle width direction so that the operator can check the rear side of the lower traveling body;
A support portion for supporting the bracket so that the mirror body can be displaced from the projecting position to a separation position separated from the lower traveling body;
An assist member that is provided on the bracket or the mirror body, and applies a component force in a direction away from the lower traveling body to the bracket or the mirror body when the counterweight being lowered contacts and receives an external force; Mirror device equipped with. The bracket has a proximal end and a distal end,
The base end portion is supported by the support portion so as to be rotatable about the front-rear direction of the lower traveling body, and the mirror main body is held at the distal end portion.
The assist member is
The mirror device according to claim 1, further comprising an inclined portion fixed to the bracket and inclined outward in the vehicle width direction from the lower traveling body with respect to a vertical direction.   3. The mirror device according to claim 2, wherein the assist member includes a straight rod-like member having one end fixed to a base end of the bracket and inclined outward in the vehicle width direction from the lower traveling body with respect to a vertical direction. The assist member is
A leg provided at the tip of the bracket and extending upward;
An umbrella provided on the leg and extending on both sides of the mirror body;
The mirror device according to claim 2, wherein a part of the umbrella portion is inclined outward in the vehicle width direction from the lower traveling body with respect to a vertical direction.

Images