JP5222829B2 - Work machine monitor fixing structure - Google Patents

Description

  The present invention relates to a monitor fixing structure for fixing a monitor device inside a cab of a work machine.

  A monitor device for displaying machine information necessary for an operator (operator) is provided inside a cab (operator's cab) of a work machine such as a hydraulic excavator. The machine information displayed on the monitor device varies widely, including the amount of hydraulic oil, the amount of engine oil, the amount of engine coolant, battery voltage, engine speed, hydraulic oil temperature, pump discharge pressure, and the like. Generally, the monitor device is fixed at a position that does not interfere with the view of the operator seated in the cab. For example, FIG. 4 of Patent Document 1 shows a structure in which a monitor device (display device) is provided at the right end portion on the front surface of the cab as viewed from the seating seat of the operator.

  By the way, in order to improve the visibility of the display screen, a monitor device having a mechanism for adjusting an angle with respect to an operator is known. For example, FIG. 2 of Patent Document 2 shows a monitor device provided with a monitor panel portion in which the monitor panel portion is swingable in the vertical direction and a positioning mechanism provided at the base portion thereof. In this technique, the rocking is stopped by pressing the tip of the ball and bolt against the rocking shaft of the monitor panel unit, and the angle of the monitor device is fixed at a desired position.

JP 2004-308136 A (FIG. 4, paragraph 0018) No. 7-32242 (Fig. 2)

However, in the structure in which the rotation is stopped by fastening the bolt as described in Patent Document 2, it is necessary to support the monitor device so that it does not move from the angle adjustment work to the completion of the fastening work. In addition, it takes time and there is a problem that when the fastening force of the bolt is insufficient, the monitor device is easily fixed and may not be fixed securely.
Further, even if the monitor device is firmly fixed immediately after the angle of the monitor device is adjusted, the monitor device is not always firmly fixed even after a long time has passed. In particular, in a work machine in which an external force such as vehicle body vibration is likely to act for a long time, the bolt may be loosened over time. On the other hand, since it is difficult to visually check the looseness of the bolt, it is necessary to periodically check the fastening force using a fastener, and there is a problem that maintenance is complicated.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a monitor fixing structure for a work machine that can easily and surely adjust the angle with a simple configuration.

  In order to achieve the above object, a monitor fixing structure for a work machine according to claim 1 of the present invention is a monitor fixing structure for fixing a monitor device inside a cab of the work machine, and is fixed to the cab. A first cylindrical portion formed in a cylindrical shape, a second cylindrical portion fixed to the monitor device and fitted into the first cylindrical portion, the first cylindrical portion, and the second cylindrical portion A clamp device that is externally fitted to a fitting portion with the portion, and clamps and fixes the fitting portion from the outside, and is drilled in one of the first cylindrical portion and the second cylindrical portion, and extends in the circumferential direction A slit hole formed on one of the first cylinder part and the second cylinder part and projecting toward one of the slits, and the slit is formed when the first cylinder part and the second cylinder part are fitted. And a protrusion disposed inside the hole.

  According to a second aspect of the present invention, there is provided a monitor fixing structure for a work machine according to the present invention, in addition to the structure of the first aspect, wherein the clamp device is formed in a C-shaped cross section formed by cutting a part of the ring. A missing ring part that is externally fitted to the fitting part, a pair of opposed parts that are extended from both ends of the missing ring part and are arranged opposite to each other, and spanned between the pair of opposed parts. A connecting rod locked to one of the pair of opposing portions, a lever portion supported rotatably with respect to the connecting rod, and a lever portion integrally formed with the lever portion at the base end of the lever portion, While pressing the other of the pair of facing portions toward the one, the distance between the contact position of the pair of facing portions with the other and the rotation center of the lever portion is changed according to the rotation angle of the lever portion. And having a cam portion to be operated.

  According to a third aspect of the present invention, there is provided a monitor fixing structure for a work machine according to the present invention. Fixed to the back side, and when the fitting portion is fixed by the clamp device, the lever portion is accommodated on the back side of the monitor device and disposed outside the viewing range from the seat side, and the clamp device At the time of releasing the fixing of the fitting part, it is characterized in that it protrudes from the back side of the monitor device and is disposed within the visible range from the seat side.

According to the monitor fixing structure for a working machine of the present invention (Claim 1), the angle around the cylinder axis of the monitor device with respect to the cab can be easily adjusted. Further, the angle adjustment range can be set according to the extension length of the slit hole.
Further, according to the monitor fixing structure of the working machine of the present invention (Claim 2), the clamping device can be tightened and released by a simple operation of tilting the lever portion, and the angle of the monitoring device can be adjusted. The operability of adjustment can be improved.

  In addition, according to the monitor fixing structure for a working machine of the present invention (claim 3), confirmation of forgetting to tighten the clamp device is facilitated, and convenience can be improved. Further, when the clamp device is fixed, the lever portion can be hidden behind the monitor device, so that a good field of view can be secured.

FIG. 2 is a perspective view showing the inside of a cab to which a monitor fixing structure according to an embodiment of the present invention is applied. It is a perspective view which shows the whole structure of this monitor fixing structure. It is a figure which shows the 1st fixing tool of FIG. 2, (a) is a top view, (b) is a side view, (c) is principal part sectional drawing [AA sectional drawing of FIG.3 (b)]. . It is a figure which shows the 2nd fixing tool of FIG. 2, (a) is a front view, (b) is a side view of a right bracket [side view in the BB surface of FIG. 4 (a)], (c) is required. FIG. 4 is a partial cross-sectional view (C-C cross-sectional view in FIG. 4A) and FIG. 4D is a main cross-sectional view [DD cross-sectional view in FIG. 3A and 3B are three views showing the clamping device of FIG. 2, in which FIG. 2A is a top view, FIG. 2B is a longitudinal sectional view (cross-sectional view taken along line EE in FIG. 5A), and FIG. FIG. 3 is a horizontal sectional view of the monitor fixing structure showing a state in which the monitor device of FIG. 2 is not fixed. It is a principal part expanded sectional view of this monitor fixing structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1. Constitution]
A cab 10 of a hydraulic excavator to which this cab structure is applied is shown in FIG. In the cab 10, a seat 7 (driver's seat) on which an operator is seated is provided, and a monitor device 6 is installed on the right front thereof. The monitor device 6 is arranged with its display screen facing the operator seated on the seat 7 and is fixed to a structure of the cab 10 (for example, a pillar, a cab floor, etc.).

As shown in FIG. 2, the first fixture 4 and the second fixture 5 are provided on the back surface 6 a of the monitor device 6. The monitor fixing structure of the present embodiment includes a first fixing tool 4, a second fixing tool 5 and a clamp device 3 made of metal or resin.
The first fixture 4 is a member fixed to the cab 10, and the second fixture 5 is a member fixed to the monitor device 6. Further, a cable 6b connected to the monitor device 6 is inserted into the second fixture 5, and the second fixture 5 is fixed so as to cover the joint between the back surface 6a of the monitor device 6 and the cable 6b. The first fixture 4 is fitted into the second fixture 5 and the clamp device 3 is fitted outside the fitting portion.

As shown in FIGS. 3A and 3B, the first fixture 4 includes a first fixing portion 4 a serving as a fixing surface for the cab 10, and a first extending portion 4 b extending from one side thereof. . Moreover, the cylindrical 1st cylinder part 1 is formed in the front-end | tip of the 1st extension part 4b. As shown in FIG. 3C, the first cylindrical portion 1 has a protruding portion 1a protruding outward from the cylindrical surface.
As shown in FIG. 4 (a), the second fixture 5 is divided into left and right parts, that is, a right bracket 5a arranged on the right side in the figure and a left bracket arranged on the left side in the figure. 5b. The right bracket 5a and the left bracket 5b are formed in a shape having a mirror image relationship with each other, and are fixed to the monitor device 6 in a state of being opposed to each other with a predetermined gap. Here, FIG. 4B shows a side surface of the right bracket 5a viewed from the side (opposing surface 8) where the right bracket 5a and the left bracket 5b face each other, and the structure of the right bracket 5a will be described in detail. The facing surface 8 is a flat surface. Further, the left bracket 5b has a plane symmetrical shape with respect to the right bracket 5a, and is disposed to face each other so that the facing surfaces 8 are parallel to each other.

  The right bracket 5a includes a second fixing portion 5c serving as a fixing surface for the monitor device 6, and a bulging portion 5d bulging from the fixing surface. A hollow semi-cylindrical through hole 5e is formed in the center of the bulging portion 5d. The through holes 5e of the right bracket 5a and the left bracket 5b are juxtaposed so that the insides of the cylindrical surfaces face each other, thereby forming a cylindrical cavity into which the cable 6b is inserted.

A hollow semi-cylindrical fitting portion 2a is provided integrally with the bulging portion 5d at an upper portion adjacent to the bulging portion 5d. The fitting portions 2a of the right bracket 5a and the left bracket 5b are juxtaposed so that the inner cylinder surface 2b faces each other, thereby forming a hollow cylindrical second tube portion 2 that fits the first tube portion 1. .
In this embodiment, the 1st cylinder part 1 is engage | inserted with respect to the 2nd cylinder part 2 so that the cylinder axis of the 1st cylinder part 1 and the cylinder axis of the hollow cylinder formed by the inner cylinder surface 2b may correspond. . As shown in FIG. 4B, the cylinder axis is orthogonal to the direction in which the cable 6b is inserted. In this example, the fitting direction of the first tube portion 1 and the second tube portion 2 is substantially parallel to the back surface of the monitor device 6, and the insertion direction of the cable 6 b is substantially perpendicular to the back surface of the monitor device 6. It becomes.

As shown in FIGS. 4A to 4D, a gap 2c having a predetermined width W ₀ is provided between the right bracket 5a and the left bracket 5b. The gap 2c is provided over all of the fitting portion 2a, the second fixing portion 5c, and the bulging portion 5d forming the second cylindrical portion 2, and the relative displacement of the right bracket 5a and the left bracket 5b in the direction of separation / contact is performed. Allow. In addition, the extending direction of the gap 2c in the second cylindrical portion 2 is parallel to the cylindrical axis, and deformation in the reduced diameter direction of the cylindrical surface is allowed. Incidentally, the width dimension W ₀ of the distance gap 2c between the respective opposed surfaces 8 of the right bracket 5a and left bracket 5b. Therefore, the width dimension W ₀ is defined according to the position at which the right bracket 5 a and the left bracket 5 b are fixed to the monitor device 6.

  As shown in FIG. 4 (a), the fitting portion 2a forming the second cylinder portion 2 has its outer cylinder surface and inner cylinder surface (with the right bracket 5a and the left bracket 5b fixed to the monitor device 6). That is, a slit hole 2d communicating with the inner cylindrical surface 2b) is provided. The slit hole 2 d extends in the circumferential direction on the outer cylindrical surface of the second cylindrical portion 2. When the first tube portion 1 and the second tube portion 2 are fitted together, the protruding portion 1 a of the first tube portion 1 is disposed inside the slit hole 2 d of the second tube portion 2. The rotation angle range of the first cylinder part 1 with respect to the second cylinder part 2 is defined by the protrusions 1a and the slit holes 2d.

A vertical slit 2e having a width wider than the gap 2c is provided on the upper end side of the second cylindrical portion 2 with respect to the slit hole 2d. As shown in FIG. 4C, the width dimension of the vertical slit 2e is W ₁ (W ₁ > W ₀ ). Similar to the gap 2c, the vertical slit 2e allows relative displacement in the direction of separation between the right bracket 5a and the left bracket 5b, and further allows deformation of the cylindrical surface of the second cylindrical portion 2 in the diameter reducing direction. To function.

  For example, when a force in the direction in which the right bracket 5a and the left bracket 5b are brought close to each other is applied, the right bracket 5a and the left bracket 5b (or, within the range allowed by the width dimension of the gap 2c and the vertical slit 2e (or These and the monitoring device 6 are slightly elastically and plastically deformed. In addition, it is preferable to make the position which provides the vertical slit 2e correspond to the position which clamps the clamp apparatus 3 mentioned later.

As shown in FIGS. 5 (a) to 5 (c), the clamp device 3 includes an annular portion 3a, a pair of opposing portions 3b, a connecting rod 3c, a lever portion 3d, and a cam portion 3e. The missing ring part 3 a is a part that is formed in a C-shaped cross section by cutting a part of the ring and is fitted on the fitting part between the first cylinder part 1 and the second cylinder part 2. Further, a convex portion 3f that protrudes inward is formed in the missing ring portion 3a. The width of the convex portion 3f in the top view is W ₂ (W ₂ <W ₁ ) as shown in FIG. The convex portion 3 f is disposed inside the vertical slit 2 e of the second cylindrical portion 2. The convex portion 3 f is a part used for positioning the clamping device 3.

  The pair of facing portions 3b are portions that extend from both ends of the missing ring portion 3a and are disposed facing each other at a distance from each other. Each of these facing portions 3b is formed with a through hole 3i for loosely inserting the connecting rod 3c. The connecting rod 3c is a member that spans between the pair of opposing portions 3b. As shown in FIG. 5B, the connecting rod 3c is arranged so as to penetrate the two through holes 3i. Further, a locking portion 3h having a diameter larger than that of the through hole 3i is formed at one end of the connecting rod 3c, and one end of the connecting rod 3c is locked to one opposing portion 3b. At the other end of the connecting rod 3c, the base end portion of the lever portion 3d is rotatably supported.

A cam portion 3e is formed at the base end portion of the lever portion 3d. As shown to Fig.5 (a), the cam part 3e is a site | part which can contact the other opposing part 3b. The shape of the cam portion 3e is such that the distance from the rotation center P of the lever portion 3d to the connecting rod 3c to the contact position of the cam portion 3e with the other facing portion 3b changes according to the rotation angle of the lever portion 3d. Formed. For example, in the state shown in FIG. 5 (a), the distance from the rotation center P to the contact position between the opposing portion 3b is L _1. On the other hand, when the lever portion 3d is rotated 90 degrees clockwise, the distance becomes L ₂ (L ₂ <L ₁ ). As described above, the cam portion 3e functions to reduce the distance between the pair of opposed portions 3b and reduce the diameter of the missing ring portion 3a.

  FIG. 6 shows a state in which the fixing of the clamping device 3 is released while the first cylindrical portion 1 fixed to the cab 10 and the second cylindrical portion 2 fixed to the monitor device 6 are fitted. 3 d of lever parts are formed in the length which the front-end | tip 3g protrudes from the side edge part 6c of the monitor apparatus 6 in such a fixed release state. Further, the tip 3g of the lever portion 3d is formed in a shape that is easy for the operator to visually recognize (for example, a geometric shape such as a round shape or a star shape) or is conspicuous (for example, red, yellow, yellow and black). Color).

[2. Action, effect]
According to this monitor fixing structure, the angle around the cylinder axis of the monitor device 6 with respect to the cab 10 can be easily adjusted by fitting the first cylinder part 1 and the second cylinder part 2 together. Further, the angle adjustment range can be set according to the extension length of the slit hole 2d.
That is, as shown in FIG. 7, the protrusion 1a can move within a range of a length obtained by subtracting the width of the protrusion 1a from the width in which the slit hole 2d is formed, and the orientation of the monitor device 6 is set at an angle α. It can be adjusted freely within the range. Further, the longer the slit hole 2d is formed in the circumferential direction of the second cylindrical portion 2, the wider the angle adjustment range of the monitor device 6 becomes.

  Further, the clamping device 3 can be tightened and released by one touch by a simple operation of tilting the lever portion 3d having the cam portion 3e formed at the base end portion. That is, a fastening operation using a fastener such as a bolt or a nut is unnecessary, and the operability of the angle adjustment of the monitor device 6 can be improved. In addition, since the convex part 3f engaged with the vertical slit 2e of the 2nd cylinder part 2 is formed in the missing ring part 3a of the clamp apparatus 3, positioning of the clamp apparatus 3 with respect to the 2nd cylinder part 2 is easy, In this respect, the operability is good.

  Further, when the clamping device 3 is released from the tightening, the tip 3g of the lever portion 3d jumps out from the side end 6c of the monitor device 6 as shown in FIG. be able to. Even if the clamping device 3 is unintentionally loosened, it is easy to visually confirm this. Moreover, since the front-end | tip 3g of the lever part 3d is formed with the shape or color with high visibility, said effect can be heightened further.

Further, since the width dimension W ₁ of the longitudinal slits 2e is set larger than the width W ₀ of the gap 2c opposing surfaces 8, the degree of freedom of the second cylindrical portion 2 of the deformation at the upper portion than the slit hole 2d The fastening by the clamp device 3 can be ensured. As shown in FIG. 4 (b), the fitting direction of the first tube portion 1 and the second tube portion 2 is substantially orthogonal to the insertion direction of the cable 6b, so that the extension via the cable 6b. Even if there is an external force acting in the direction, there is an advantage that the external force is less likely to act in the direction of pulling out the first tube portion 1 and the second tube portion 2, and the fixed state of the monitor device 6 can be easily maintained.
As described above, it is possible to provide a monitor fixing structure for a work machine that can easily and reliably adjust the angle with a simple configuration.

[3. Others]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
In the above-described embodiment, the first cylindrical portion 1 is formed in a cylindrical shape, and the fitting portion 2 a formed in the second cylindrical portion 2 is formed in a hollow cylindrical shape that is fitted to the first cylindrical portion 1. However, the case where the fitting state of the 1st cylinder part 1 and the 2nd cylinder part 2 is reverse is also considered. That is, the members having the first tube portion 1 and the second tube portion 2 can be replaced with each other.

  Moreover, although the 1st cylinder part 1 is inserted from upper direction with respect to the 2nd cylinder part 2 located in the downward direction in FIG. 2, you may make the vertical relationship on arrangement | positioning of these members reverse. In this case, it is possible to make the monitor device 6 difficult to fall when the clamping device 3 is released from tightening. Even in the case of the present embodiment, since the protruding portion 1a of the first cylindrical portion 1 is locked to the hole wall of the slit hole 2d, the monitor device 6 does not fall immediately.

  In the above-described embodiment, the monitor fixing structure is applied to the cab 10 of a hydraulic excavator. However, the monitor device is fixed inside the cab of a work machine in general such as a wheel loader, a bulldozer, or a crane vehicle. It can be applied as a monitor fixing structure.

DESCRIPTION OF SYMBOLS 1 1st cylinder part 1a Protrusion part 2 2nd cylinder part 2a Fitting part 2b Inner cylinder surface 2c Space | gap 2d Slit hole 2e Vertical slit 3 Clamping device 3a Ring part 3b Opposing part 3c Connecting rod 3d Lever part 3e Cam part 3f Convex Part 3g Tip 3h Locking part 3i Through hole 4 First fixing tool 4a First fixing part 4b First extension part 5 Second fixing tool 5a Right bracket 5b Left bracket 5c Second fixing part 5d Swelling part 5e Through hole 6 Monitor device 6a Back surface 6b Cable 6c Side edge 7 Sheet 8 Opposing surface 10 Cab

Claims (3)

A monitor fixing structure for fixing a monitor device inside a cab of a work machine,
A first cylindrical portion fixed to the cab and formed in a cylindrical shape;
A second cylindrical portion fixed to the monitor device and formed in a cylindrical shape to be fitted into the first cylindrical portion;
A clamp device that is externally fitted to a fitting portion between the first tube portion and the second tube portion, and clamps and fixes the fitting portion from the outside;
A slit hole drilled in one of the first cylinder part and the second cylinder part and extending in the circumferential direction;
Either one of the first cylinder part and the second cylinder part protrudes toward one of the above, and is disposed inside the slit hole when the first cylinder part and the second cylinder part are fitted. A monitor fixing structure for a work machine, comprising: The clamping device is
A missing ring part formed in a C-shaped cross-section formed by cutting a part of the ring and externally fitted to the fitting part;
A pair of opposing portions that are extended from both ends of the missing ring portion and are opposed to each other,
A connecting rod that spans between the pair of opposing portions and is locked to one of the pair of opposing portions;
A lever portion rotatably supported with respect to the connecting rod;
The lever portion is integrally formed with the lever portion at the base end, presses the other of the pair of facing portions toward the one side, and contacts with the other of the pair of facing portions and the rotation of the lever portion. The monitor fixing structure for a work machine according to claim 1, further comprising a cam portion that changes a distance from the center according to a rotation angle of the lever portion. The second cylinder portion is fixed to the back side of the monitor device with respect to a seat disposed inside the cab;
When the fitting portion is fixed by the clamp device, the lever portion is accommodated on the back side of the monitor device and is disposed outside the visible range from the seat side, and the fixing portion is fixed by the clamp device. 3. The monitor fixing structure for a work machine according to claim 2, wherein the monitor fixing structure protrudes from the back side of the monitor device and is disposed within a viewable range from the seat side when releasing.

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