JP2018204241A - Construction machine armrest device - Google Patents

Abstract

To provide a construction machine armrest device capable of adjusting a height of a rest portion with a simple structure and operation.SOLUTION: A construction machine armrest device 5 comprises a hollow support pillar 10 extending upward from a construction machine body, a hollow stay 20 slidably inserted, a rest portion 30 supported on an upper end of the stay 20, and a lock mechanism A for locking the stay 20 with respect to the support pillar 10. The lock mechanism A comprises a plurality of first engaging holes 11a formed at intervals on a front wall 11 of the support pillar 10, a second engaging hole 21a formed in a front wall 21 of the stay 20, a lever 40 accommodated in the stay 20 and having a lower end rotatably connected to the stay 20, an engaging portion 50 provided on the lever 40, a spring 60 for urging the lever 40 forward, and an operation portion 70 for unlocking provided at the upper end portion of the lever 40. When the engaging portion 50 fits into one of the first engaging holes 11a and fits into the second engaging hole 21a, the stay 20 is locked.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an armrest device for construction equipment that can adjust the height of a rest portion.

In a construction machine such as a hydraulic excavator, a joystick for rotating an arm is disposed beside a driver's seat, and an armrest device is disposed in the vicinity of the rear of the joystick. In order to reduce fatigue of the arm, the operator places the forearm or wrist on the armrest and operates the joystick.
The optimal height of the rest of the armrest device varies depending on the physique and preferences of the operator. Therefore, the height of the rest part can be adjusted.

  The armrest device disclosed in Patent Document 1 is provided with a cylindrical support fixed to the construction machine body, a cylindrical stay provided on the outside of the support so as to be slidable in the vertical direction, and an upper end of the stay. And a rest portion.

  In Patent Document 1, the height of the rest portion is adjusted in a plurality of stages, for example, three stages, and a lock mechanism is provided for locking the stay at the adjusted height. This locking mechanism includes two female screw portions that are fixed to a stay and extend in the horizontal direction and are separated from each other in the vertical direction, five through holes that are formed in the column so as to be separated in the vertical direction, and two bolts. The female thread portion is accommodated in the column through a slit formed in the column and extending in the vertical direction. The movement of the stay is prohibited by passing the two bolts through two through holes selected from among the five through holes of the support and screwing them into the two female screw portions of the stay.

In the armrest device disclosed in Patent Literature 2, a cylindrical stay is slidably inserted into a cylindrical support column in the vertical direction, and a rest portion is fixed to an upper end portion of the stay.
The lock mechanism of Patent Document 2 includes a holding hole formed in the stay, a sphere held in the holding hole, and a plurality of engagement holes formed in the support at intervals in the vertical direction. . By selectively engaging the sphere with one of these engagement holes, the height of the rest portion can be adjusted stepwise to lock the stay.

The lock mechanism of Patent Document 2 further has a holder housed in the stay and biased downward by a spring. The holder engages with the sphere by inhibiting the movement of the sphere radially inward. The engaged state of the holes is maintained.
Furthermore, the lock mechanism has an operation knob for unlocking arranged at the upper end of the stay. The operation knob is connected to the holder via a shaft member. By pulling the operation knob upward, the holder moves upward against the spring, allowing the ball to retract in the radially inward direction. As a result, the engagement state between the ball and the engagement hole is canceled, and the stay can move in the vertical direction.

Utility Model Registration No. 2593587 JP 2012-97443 A

  In the lock mechanism of the armrest device of Patent Literature 1, the lock of the stay is released by removing the bolt from the female threaded portion of the stay and the through hole of the support, the height of the rest portion is adjusted, and then the bolt from the other through hole again. Since the stay is locked again by inserting and screwing it into another female screw part, the height adjustment work of the rest part is complicated.

  In the armrest device of Patent Document 2, the stay is unlocked by lifting the operation knob with a finger and moving the holder upward, and releasing the hand from the operation knob and moving the holder downward by the force of the spring. Since the is locked again, the operability of the height adjustment work of the rest portion is improved. However, the structure of the lock mechanism is complicated. Further, it is necessary to adjust the height by lifting the operation knob with the finger of one hand and holding the rest portion with the other hand to adjust the height, and further improvement in operability is required.

The present invention has been made to solve the above-described problems, and includes a hollow column extending upward from the construction machine main body, a slidably inserted vertically in the column, extending along the column, and an upper end of the column. In the armrest device for construction equipment comprising a hollow stay protruding upward from the opening, a rest portion supported by the upper end of the stay, and a lock mechanism for locking the stay to the support column,
The lock mechanism is formed in a wall facing a selected direction in the support column, a plurality of first engagement holes formed at intervals in the vertical direction, and a wall facing the selected direction in the stay. A second engagement hole, a lever which is accommodated in the stay and extends in the vertical direction, and whose lower end is pivotable in the selected direction and in the opposite direction, coupled to the stay, and the lever An engagement portion that is fitted in one of the plurality of first engagement holes of the support column and that fits in the second engagement hole of the stay to inhibit the stay from moving relative to the support column; A spring that is disposed and biases the lever in the selected direction, and is provided at the upper end of the lever, protrudes in the selected direction through the stay, and below the rest portion. Placed Characterized in that it comprises an operation section for unlocking the.

  According to the above configuration, the lock of the stay can be released simply by pushing the unlocking operation part toward the stay, and the stay can be locked again by releasing the operation part, so the position adjustment work of the rest part is easy. is there. In addition, since the operation of adjusting the height by grasping the rest portion while pressing the operation portion can be executed with one hand, the position adjustment operation can be further facilitated. The structure of the lock mechanism can be simplified by using a lever.

Preferably, the front end portion of the rest portion is fixed to the upper end of the stay and extends rearward, the selected direction is the front, and the operation unit for unlocking is disposed on the front side of the stay. ing.
According to the above configuration, when the position of the rest portion is adjusted with one hand, the operation portion can be easily pushed without being disturbed by the rest portion.

Preferably, the second engagement hole is larger than the first engagement hole, and the engagement portion includes a first engagement portion that fits into the first engagement hole and a second fit that fits into the second engagement hole. The second engagement portion is larger than the first engagement portion, and the second engagement portion receives the force of the spring via the lever and is selected for the strut. It hits the inner surface of the wall facing the opposite direction.
According to the said structure, even if there exists a play between a support | pillar and a stay, the shakiness of a stay can be suppressed.

Preferably, a guide bush covering the outer periphery of the upper end is fixed to the upper end of the support column, and a pressing piece located in the selected direction is formed on the upper edge of the guide bush. A pressing piece pushes the stay in a direction opposite to the selected direction.
According to the said structure, even if there exists a play between a support | pillar and a stay, the shakiness of a stay can be suppressed.

  According to the armrest device for a construction machine of the present invention, the structure of the lock mechanism can be simplified, and the height of the rest portion can be adjusted by a simple operation.

It is a perspective view of the armrest device for construction machines concerning one embodiment of the present invention. It is a longitudinal cross-sectional view of the armrest apparatus, and shows a state where the stay is locked to the support column. It is a longitudinal cross-sectional view of the armrest apparatus, and shows a state in which the stay is unlocked.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a console box 1 arranged beside a driver's seat of a construction machine. The console box 1 constitutes a part of the construction machine main body. In this specification, “front” and “rear” are defined based on the driver sitting in the driver's seat.

  A joystick (operating lever) (not shown) for operating the arm of the construction machine extends upward from the console box 1. The console box 1 is provided with an armrest device 5 in the vicinity of the rear of the joystick.

  The armrest device 5 includes a support column 10 that is fixed to the console box 1 via the bracket 2 and extends upward, a stay 20 that is inserted into the support column 10 and extends along the support column 10, and a rest portion that is provided at the upper end of the stay 20. 30.

The support column 10 and the stay 20 are formed of a cylinder having a substantially square cross section. The stay 20 is longer than the column 10 and protrudes upward from the upper end opening of the column 10.
The front end portion of the rest portion 30 is positioned at the upper end of the stay 20 and extends rearward long. The rest portion 30 includes a substantially rectangular substrate 31 and a cushion material 32 that covers the substrate 31. A substrate 31 is fixed to the upper end of the stay 20.

The armrest device 5 includes a lock mechanism A that locks the stay 20 with respect to the support column 10 so that the height of the stay 20 can be adjusted.
The lock mechanism A has a plurality of (five in this embodiment) first engagement holes 11a formed in the front wall 11 of the support column 10 (in the selected direction, ie, the wall facing forward in the present embodiment). Yes. These first engagement holes 11a are circular with the same diameter and are formed at equal intervals in the vertical direction.
The lock mechanism A has a single second engagement hole 21a formed in the lower part of the front wall 21 of the stay 20 (the wall in the selected direction, that is, the wall facing forward in the present embodiment). In the present embodiment, the second engagement hole 21a is circular and has a larger diameter than the first engagement hole 11a.

The lock mechanism A further includes a lever 40, an engagement member 50 (engagement portion), a spring 60, and an operation member 71.
The lever 40 is housed in the stay 20 in the form of an elongated plate, and extends in the vertical direction while facing the front wall 21 of the stay 20. A shaft member 25 that is fixed to the lower end portion of the stay 20 and extends in the left-right direction (a direction orthogonal to the paper surface in FIG. 2) is inserted into the lower end curl portion 41 of the lever 40. As a result, the lever 40 is supported by the stay 20 so as to be pivotable in the front-rear direction around the curl portion 41.

  The engaging member 50 is fixed to the lever 40 with its axis line directed in the front-rear direction. The engaging member 50 has a circular cross section, and the diameter decreases stepwise forward along the axis. The engaging member 50 is fixed to the lever 40 by means such as welding in a state where the intermediate portion 52 is fitted in the fixing hole 40a formed in the lever 40 and the rear end portion 53 having a large diameter is in contact with the rear surface of the lever 40. ing.

  An intermediate portion 52 of the engaging member 50 is provided as a second engaging portion, protrudes from the front surface of the lever 40 and fits into the second engaging hole 21a of the stay 20, and the small-diameter front end portion 51 of the engaging member 50 is the first. It is provided as an engaging portion and is adapted to fit into the first engaging hole 11 a of the support column 10.

  The spring 60 includes a first portion 61 at the upper end that extends left and right along the rear surface of the lever 40, a pair of second portions 62 that extend downward from the left and right ends of the first portion 61, and the lower ends of the second portions 61. And a pair of third portions 63 that are folded back and extend upward. The first member 61 is fixed to the rear surface of the lever 40 by a fixing plate 65. The spring 60 is elastically deformed and the second portion 62 hits the rear surface of the lever 40, and the third portion 63 hits the rear wall 22 of the stay 20, whereby the lever 40 moves forward, that is, the front wall 21 of the stay 20. It is energizing towards.

The upper end portion of the lever 40 is bent forward, and an operation member 71 made of hard resin is fixed to the bent portion 42. The bent portion 42 of the lever 40 and the operation member 71 constitute an operation portion 70 for unlocking.
An insertion hole 21 b is formed in the upper end portion of the front wall 21 of the stay 20, and a notch 32 a connected to the insertion hole 21 b is formed in the lower surface of the front end portion of the cushion 32 of the rest portion 30. The operation member 70 protrudes forward of the stay 20 through the insertion hole 21b and the notch 32a.
In the present embodiment, the operation unit 70 is located below the front end portion of the rest unit 30.

  A hard resin guide bush 80 is fixed to the upper end of the column 10. The guide bush 80 includes a peripheral wall 81 having a shape along the outer peripheral shape of the support column 10 and an overhanging portion 82 protruding inward from the upper edge of the peripheral wall 81, and a plurality of locking claws on the inner surface of the peripheral wall 81. 83. With the peripheral wall 81 covering the upper end portion of the column 10 and the overhanging portion 82 hitting the upper end edge of the column 10, the locking claw 83 fits into the locking hole 12 a formed in the upper end portion of the column 10, The guide bush 80 is fixed to the column 10.

  A pressing piece 85 is formed on the front edge of the peripheral wall 81 of the guide bush 80. The pressing piece 85 protrudes inward from the front wall 11 of the column 10 when the stay 20 is not inserted into the column 10. In a state where the support column 10 is inserted into the stay 20, the pressing piece 85 hits the front surface of the support column 10 in an elastically deformed state and urges the stay 20 backward. As a result, even if there is some play between the support column 10 and the stay 20, the back wall 22 of the stay 20 hits the rear wall 12 of the support column 10. .

  The left and right edges of the peripheral wall 81 of the guide bush 80 are also formed with pressing pieces 86 similar to the pressing pieces 85, and by pressing the left and right surfaces of the stay 20 with these pressing pieces 86, The rattling is suppressed.

The lock state of the stay 20 of the armrest device having the above configuration will be described with reference to FIG. In this locked state, the lever 40 approaches the front wall 21 of the stay 20 by the spring 60, and the first engagement portion 51 of the engagement member 50 becomes one of the five first engagement holes 11 a of the column 10. The second engagement portion 52 is fitted in the second engagement hole 21 a of the stay 20. Thereby, the stay 20 is prohibited from moving up and down with respect to the column 10.
An operator of the construction machine places a forearm portion or wrist on the rest portion 30 and operates a joystick disposed near the front of the armrest device 5.

  In the locked state, the front end surface of the second engagement portion 52 of the engagement member 50 abuts against the inner surface of the front wall of the support column 10 with the elastic force of the spring 60, so that the lower portion of the stay 20 is rearward. Since the rear wall 22 of the stay 20 abuts against the rear wall 12 of the support column 10, the backlash of the stay 20 in the front-rear direction can be suppressed in combination with the action of the guide bush 80.

  When the operator of the construction machine changes, it is necessary to adjust the height of the rest portion 30 according to the physique and preference of the operator. In this case, the operator pushes the operation unit 70 backward with a finger as shown in FIG. As a result, the lever 40 rotates rearward around the lower end, and accordingly, the engaging member 50 disposed between the operation portion 70 and the lower end curl portion 41 moves rearward, and the first engaging portion. 51 is disengaged from the first engagement hole 11 a of the column 10, and the second engagement portion 52 is disengaged from the second engagement hole 21 a of the stay 20. Thereby, the stay 20 is released from the locked state with respect to the column 10.

  After the unlocking, while holding the operation unit 70, the rest unit 30 is grasped and moved to a desired height, and then the pressure on the operation unit 70 is released. Then, the lever 40 is rotated forward by the force of the spring 60, and the first engagement portion 51 of the engagement member 50 is again engaged with the first engagement hole 11a corresponding to the adjusted height, The second engagement portion 52 is engaged with the second engagement hole 21a, and the stay 20 is locked again.

  When adjusting the height of the rest portion 30, the operator can move the rest portion 30 up and down while pressing the operation portion 70 with one hand, and the stay 20 is again locked by releasing the operation portion 70. Can be done, and operability is good.

The present invention is not limited to the above-described embodiment, and various aspects can be made.
In this embodiment, the unlocking operation portion is disposed on the front side of the stay below the rest portion, but may be disposed on the left or right side or the rear side of the stay.
The cross-sectional shape of the column and stay is not limited to a square, but may be a polygon or a circle.
The first engagement hole of the support and the second engagement hole of the stay may have the same diameter. In this case, in the engaging portion, the first engaging portion that fits in the first engaging hole and the second engaging portion that fits in the second engaging hole have the same diameter.
The shapes of the first and second engagement holes and the first and second engagement portions may be other than circular.
The engaging part and the operating part may be integrated with the lever.

  The present invention can be applied to an armrest device of a construction machine.

10 strut 11 front wall (wall facing the selected direction)
11a First engagement hole 20 Stay 21 Front wall (wall facing the selected direction)
21a 2nd engagement hole 30 Rest part 40 Lever 50 Engagement member (engagement part)
51 First engagement portion 52 Second engagement portion 60 Spring 70 Unlocking operation portion 80 Guide bush 85 Pressing piece A Lock mechanism

Claims (4)

A hollow column extending upward from the construction machine body,
A hollow stay that is slidably inserted into the support column in the vertical direction, extends along the support column, and protrudes upward from the upper end opening of the support column.
A rest portion supported by the upper end of the stay;
A locking mechanism for locking the stay to the support;
In the armrest device for construction equipment provided with
The locking mechanism is
A plurality of first engagement holes formed on the wall facing the selected direction in the support column at intervals in the vertical direction;
A second engagement hole formed in the wall facing the selected direction in the stay;
A lever housed in the stay and extending in the vertical direction, the lower end being pivotable in the selected direction and the opposite direction and coupled to the stay;
An engaging portion that is provided on the lever and that fits into one of the plurality of first engaging holes of the support and the second engaging hole of the stay to inhibit the stay from moving relative to the support;
A spring disposed within the stay and biasing the lever in the selected direction;
An unlocking operation portion provided at an upper end portion of the lever, projecting in the selected direction through the stay, and disposed below the rest portion;
An armrest device for construction equipment, comprising:   The front end portion of the rest portion is fixed to the upper end of the stay and extends rearward, the selected direction is the front, and the unlocking operation portion is disposed on the front side of the stay. The armrest device for construction equipment according to claim 1, wherein:   The second engagement hole is larger than the first engagement hole, and the engagement portion includes a first engagement portion that fits in the first engagement hole and a second engagement portion that fits in the second engagement hole. The second engagement portion is larger than the first engagement portion, and the second engagement portion receives the force of the spring via the lever, and the selected direction of the support column. The armrest device for construction equipment according to claim 1, wherein the armrest device hits an inner surface of a wall facing the building.   A guide bush covering the outer periphery of the upper end is fixed to the upper end of the support column, and a pressing piece positioned in the selected direction is formed on the upper edge of the guide bush. The armrest device for a construction machine according to any one of claims 1 to 3, wherein the stay is pushed in a direction opposite to the selected direction.

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