JP6505075B2 - Armrest device for construction machinery - Google Patents

Description

  The present invention relates to a construction machine arm rest device capable of adjusting the height of a rest portion.

  In a construction machine such as a hydraulic shovel, a joystick is disposed beside a seat on which an operator sits, and an armrest device is disposed in the vicinity of the joystick. When operating the joystick, the operator places the forearm or wrist on the armrest in order to reduce fatigue of the arm.

The optimum height of the rest portion of the armrest device varies depending on the physique and preference of the operator. Therefore, the height of the rest is adjustable.
The armrest device disclosed in Patent Document 1 includes a pipe-like support fixed to a construction machine main body, a cylindrical stay provided movably in the vertical direction on the outer periphery of the support, and an upper end of the stay. And a rest part. Inside the post, a horizontally extending female screw portion is disposed. The stay is supported by the column by screwing a bolt penetrating the stay into the female screw portion.

  In Patent Document 1, a plurality of the female screw portions are vertically spaced apart. A plurality of through holes are formed vertically apart in the stay. The height of the stay can be adjusted stepwise by selecting the female screw and the through hole, inserting the bolt into the selected through hole and screwing it into the selected female screw, and thus the height of the rest in stages. It can be adjusted.

  In the armrest device disclosed in Patent Document 2, a pipe-like stay is inserted in a pipe-like support. A ball is held by the stay, and the ball can not move up and down so that the stay can not move vertically by selectively engaging the ball in one of a plurality of engagement holes formed at intervals in the vertical direction in the column. It is supported by The engagement between the ball and the engagement hole is maintained by the lock means. The locking means is unlocked by pulling the operation knob provided at the upper end of the stay upward. In this unlocked state, the stay can be vertically moved to allow the ball to retract radially with respect to the engagement hole, and the height of the rest portion can be adjusted.

Utility model registration 2593587 gazette JP 2012-97443 A

  In the armrest device of Patent Document 1, after adjusting the height of the stay by removing the bolt from the female screw portion of the column and the through hole of the stay when adjusting the height of the rest member, insert the bolt from another through hole again The height adjustment work is complicated because the screw is screwed into another female screw part. Also, the height of the rest was graded, and the height of the rest could not be perfectly matched with the desired height.

  In the armrest device of Patent Document 2, since the unlocking and relocking can be performed by the vertical movement of the operation knob, the operability improves, but the operation knob is operated by one hand and the rest portion is operated by the other hand. It was necessary to adjust the height by hand, and there was room for improvement in operability. In addition, it was not possible to steplessly adjust the rest. Furthermore, the structure for height adjustment was also complicated.

The present invention has been made to solve the above-mentioned problems, and is provided at a top end of a hollow column projecting upward from a construction machine main body, a stay inserted from the upper end opening of the column and extending along the column, An armrest device for a construction machine, comprising: a fixed rest portion; and holding means for holding the stay on the support in such a manner that the height of the stay can be adjusted.
The cross-sectional shape of the inner peripheral surface of the column is non-circular, and the holding means has an elastically deformable frictional engagement portion provided on the stay and protruding radially outward, and the stay is The frictional engagement portion is elastically deformable on the inner circumferential surface of the support when the stay is at the first angular position, and the support is rotatable with respect to the support about a rotation axis extending in the longitudinal direction. The frictional engagement causes the stay to move up and down so that the stay is held by the support, and when the stay is at the second angular position, the stay is caused by the frictional engagement portion separating from the inner circumferential surface of the support. It is characterized in that it can move up and down with respect to the support.

  You can easily adjust the height of the rest with one hand. In addition, since the height of the rest portion can be adjusted steplessly, it can be perfectly matched with the operator's desired height. And the structure is simple.

Preferably, a plurality of the frictional engagement portions are arranged at equal angular intervals in the circumferential direction, and on the inner circumferential surface of the support, a plurality of surface areas spaced by the same angular intervals as the frictional engagement portions are the above It is provided as an engagement surface which engages with the frictional engagement portion, and these engagement surfaces are closer to the rotation axis of the stay than the other surface area of the inner peripheral surface of the support column.
According to the above configuration, it is possible to stably hold the rest portion at a desired height by the frictional engagement between the frictional engagement portion equally spaced in the circumferential direction and the engagement surface of the support column.

Preferably, the support is a pipe having a regular polygonal cross section, the stay has a circular cross section, a central axis thereof is provided as the pivot axis, and the frictional engagement portion is circumferentially The same number of corners of the support pillars are arranged at equal intervals, and a central portion of each side of the inner circumferential surface of the support pillars is provided as the engagement surface.
According to the above configuration, the stay can be supported more stably.

Preferably, the holding means includes a lock bush made of an elastic material fixed to the lower end of the stay, and the plurality of frictional engagement parts are formed on an outer peripheral portion of the lock bush.
According to the above configuration, the plurality of frictional engagement portions can be disposed by one guide bush, and the configuration can be simplified.

Preferably, the lower portion of the lock bush has a plurality of divided pieces divided in the circumferential direction, the frictional engagement portion is formed on the outer peripheral portion of these divided pieces, and the center of the lower end surface of the stay A screw hole is formed on the axis, and an accommodation space surrounded by the divided pieces is formed in the lower portion of the lock bush, and a tapered member which is tapered upward is accommodated in the accommodation space, A bolt passing through the tapered member and the upper portion of the lock bush is screwed into a threaded hole of the stay.
According to the above configuration, the optimal frictional engagement can be obtained by adjusting the screwing amount of the bolt regardless of the manufacturing error.

Preferably, a guide bush is fixed to the upper end of the support column, and the stay is inserted into a circular guide hole formed at the center of the guide bush.
According to the above configuration, centering of the stay can be performed by the guide bush, and the stay can be stably held.

  According to the construction machine arm rest device of the present invention, the height of the rest portion can be adjusted steplessly with a simple structure and a simple operation.

It is a side view of an armrest device for construction machines concerning one embodiment of the present invention. It is a side view which shows the subassembly of the stay, rest part, and lock bush in the armrest apparatus. It is a longitudinal cross-sectional view which shows the guide structure for the said stays in the armrest apparatus. The said lock bush is shown, (A) is a perspective view, (B) is a top view, (C) is a bottom view. It is a longitudinal cross-sectional view which shows the fixation structure to the said stay of the said lock bush. It is an AA arrow sectional view in Drawing 1, and (A) shows a lock state of the above-mentioned stay, and (B) shows an unlocking state, respectively.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the construction machine arm rest device is fixed to a construction machine body, for example, a console box of the construction machine, and extends vertically upward, and a support 10 is inserted along the support 10 inserted from the upper end opening of the support 10. The stay 20 is provided with an extending stay 20 and a rest 30 provided at the upper end of the stay 20.

The support 10 is made of a pipe of square cross section (regular polygon). The stay 20 is formed of a bar (round bar) having a circular cross section.
The rest portion 30 has a substrate 31 having a substantially rectangular planar shape, and a cushioning material 32 covering the substrate 31. An oblong fixed hole 31 a is formed at one end of the substrate 31. While inserting the oval shaped fixing portion 21 formed in the upper end portion of the stay 20 into the fixing hole 31a, the board (not shown) is screwed into the screw hole (not shown) of the upper end face of the fixing portion 21. 31 is fixed to the stay 20.

  As shown in FIGS. 1 and 3, a guide bush 40 made of hard resin is fixed to the upper end portion of the support 10. The guide bush 40 has a top plate portion 41 and a cylindrical portion 42 having a square cross-sectional shape which protrudes downward from the top plate portion 41. The top plate portion 41 abuts on the upper end surface of the support 10, and the cylindrical portion 42 is fitted in the upper end portion of the support 10. In the outer peripheral surface of the cylindrical portion 42, a locking claw 42a is protruded at the center of each side, and the locking portion 42a is formed in the locking hole 11 formed at the center of each side of the upper end portion of the support column 10. By being fitted, the guide bush 40 is fixed to the support 10 in a state of being prevented from coming off.

  At the center of the top plate portion 41 of the guide bush 40, a circular guide hole 41a having substantially the same diameter as the stay 20 is formed. The stay 20 is supported coaxially with the support 10 by inserting the stay 20 into the guide hole 41a. However, the stay 20 is axially movable with respect to the guide bush 40. The stay 20 is pivotable about its central axis L (rotational axis).

  As shown in FIGS. 2 and 5, a screw hole 22 is formed on the central axis L of the lower end surface of the stay 20, and four (plural) engagement grooves 23 extending radially from the screw hole 22 are formed. Is formed. The engagement grooves 23 are spaced apart by 90 degrees (equal intervals) in the circumferential direction.

As shown in FIGS. 1 and 2, a lock bush 50 (holding means) is fixed to the lower end of the stay 20 coaxially with the stay 20. As shown in FIG. 4, the lock bush 50 is made of an injection-molded product made of resin (elastic material).
As shown in FIGS. 4A and 4B, the upper portion 51 of the lock bush 50 has a disk shape, and a through hole 51a is formed at the center thereof. On the upper surface of the upper portion 51, four (plural) engagement protrusions 51b radially extending from the through hole 51a are formed. The engagement protrusions 51 b are spaced apart by 90 degrees (equal intervals) in the circumferential direction.
As shown in FIGS. 2 and 5, the lock bush 50 is inhibited from rotating relative to the stay 20 by the engagement projection 51 b of the lock bush 50 being fitted in the engagement groove 23 of the stay 20.

As shown in FIGS. 4A and 4C, the lower portion 52 of the lock bush 50 is formed with slits 54 at 90 ° intervals (equal intervals). Thus, the lower portion 52 has four (multiple) divided pieces 55 divided in the circumferential direction.
The outer peripheral portion of each divided piece 55 protrudes outward in the longitudinal direction from the peripheral surface of the upper portion 51, and is provided as a frictional engagement portion 55a and a guide portion 55b connected to the frictional engagement portion 55a. The outer surface of the frictional engagement portion 55a is a flat surface orthogonal to the radial direction. The guide portion 55b is continuous with the end of the frictional engagement portion 55a in the clockwise direction in FIG. 4B, and is inclined so as to approach the central axis of the lock bush 50 as it goes in the clockwise direction.

  As shown in FIG. 4C and FIG. 5, at the center of the lower portion 52 of the lock bush 50, an accommodation space 56 connected to the through hole 51a and surrounded by the four divided pieces 55 is formed. The diameter of the upper end of the accommodation space 56 is larger than the through hole 51a. The inner peripheral surface of the accommodation space 56 has a gentle taper such that the diameter increases from the upper end to the lower end.

  As shown in FIG. 5, a taper member 60 is accommodated in the accommodation space 56. The outer peripheral surface of the taper member 60 is tapered from the lower end to the upper end. The taper angle is larger than the taper angle of the inner peripheral surface of the accommodation space 56. A through hole 61 is formed in the taper member 60 along the central axis thereof.

As shown in FIG. 5, while the lock bush 50 is non-rotatably engaged with the lower end of the stay 20 and the taper member 60 is accommodated in the accommodation space 56 of the lock bush 50, the bolt 70 with a hexagonal hole is provided. The lock bush 50 is fixed to the lower end of the stay 20 by inserting the through hole 61 of the taper member 60, inserting the through hole 51a of the lock bush 50, and screwing it into the screw hole 22 of the stay 20.
By adjusting the screwing amount of the bolt 70, the insertion depth of the taper member 60 into the accommodation space 56 is changed, so that the radially outward protrusion amount of the frictional engagement portion 55a can be adjusted.

  In the armrest device having the above configuration, in the normal use state, as shown in FIG. 6A, when the stay 20 is in the first angular position, the frictional engagement portion 55a of the lock bush 50 is the engagement surface of the support 10 The stay 20 is supported by the frictional engagement between the frictional engagement portion 55a and the engagement surface 15 by the frictional engagement between the frictional engagement portion 55a and the engagement surface 15 (surface region of the central portion of each side of the inner circumferential surface). It is locked so as not to be able to move up and down relative to 10. In this locked state, the major axis of the rest portion 30 having a rectangular planar shape extends in the front-rear direction of the construction machine.

In the present embodiment, since the resin material having a relatively large elastic coefficient is used for the lock bush 50, a large frictional force is generated with a relatively small amount of elastic deformation of the divided piece 55, and the stay 20 is reliably locked. it can. As described above, since the amount of projection of the frictional engagement portion 55a can be adjusted by the amount of screwing of the bolt 70, this frictional engagement can be optimally adjusted.
Further, since the outer surface of the frictional engagement portion 55a in contact with the engagement surface 15 is a flat surface orthogonal to the radial direction, a stable lock can be obtained.

  An operator of the construction machine places a forearm or a wrist on the armrest in order to reduce fatigue of the arm when operating the joystick disposed in the vicinity of the armrest device.

  When the construction machine operator is replaced, the height of the rest portion 30 needs to be adjusted in accordance with the physique and preference of the operator. In this case, when the rest portion 30 is turned 45 degrees counterclockwise to bring the stay 20 to the second angular position, the frictional engagement portion 55a of the lock bush 50 engages with the support 10 as shown in FIG. Away from the surface 15, the space 16 at the corner of the support 10 is reached. Therefore, the stay 20 is unlocked and can move vertically.

After moving the rest portion 30 to a desired height after releasing the lock, the locked state shown in FIG. 6A can be obtained again by turning the rest portion 30 by 45 degrees in the clockwise direction.
At the time of the above-mentioned height adjustment, the operator holds the rest 30 with one hand, turns 45 ° counterclockwise, adjusts the height, and finally turns 45 ° clockwise. Yes, good operability.

When the stay 20 is rotated 45 ° clockwise from the unlocked state, the frictional engagement portion 55a is engaged after the guide portion 55b approaches the engagement surface 15 of the support 10 and is rubbed by the engagement surface 15. Since it reaches 15, smooth lock operation can be performed.
Further, since the outer surface of the frictional engagement surface 55a is flat, if the stay 20 is further rotated in the clockwise direction after the entire area comes in contact with the engagement surface 15, a large resistance is exerted. Therefore, the stay 20 can be positioned at the optimum lock position.

The present invention is not limited to the above embodiment, and various aspects are possible.
For example, the lock may be released by rotating the stay clockwise in the opposite direction to the above embodiment and locked by rotating it counterclockwise.
The inner circumference of the accommodation space may not be tapered.
The lock bush may not be divided.
In the present embodiment, relatively hard resin is used for the lock bush, but hard rubber may be used.
The cross-sectional shape of the support may be a regular polygon other than a square.
The number of frictional engagement parts can be selected appropriately.

  The present invention is applicable to an armrest device of a construction machine.

Reference Signs List 10 post 15 engagement surface 20 stay 22 screw hole 30 rest portion 40 guide bush 41 a guide hole 50 lock bush (holding means)
51 Upper part of lock bush 52 Lower part of lock bush 55 Divided pieces 55a Frictional engagement part 56 Housing space 60 Taper member 70 Bolt L Stay central axis (rotational axis)

Claims (6)

A hollow support post projecting upward from the construction machine body, a stay inserted from the upper end opening of the support and extending along the support, a rest portion provided at the upper end of the stay, and height adjustment of the stay to the support In a construction machine arm rest device comprising a holding means for holding the
The cross-sectional shape of the inner circumferential surface of the support is non-circular,
The holding means has an elastically deformable frictional engagement portion provided on the stay and projecting radially outward.
The stay is pivotable relative to the post about a pivot axis extending in the longitudinal direction, and when the stay is at a first angular position, the frictional engagement portion is on the inner circumferential surface of the post. The frictional engagement with the elastic deformation makes the stay vertically incapable of moving up and down and is held by the support, and the frictional engagement portion is separated from the inner circumferential surface of the support when the stay is at the second angular position. Thus, the stay can be moved up and down with respect to the support column.   The plurality of friction engagement portions are arranged at equal angular intervals in the circumferential direction, and in the inner circumferential surface of the support column, a plurality of surface areas separated by the same angular distance as the angular distance of the friction engagement portions The bearing according to claim 1, wherein the engagement surface is provided as an engagement surface that engages with the part, and the engagement surface is closer to the pivot axis of the stay than the other surface area of the inner circumferential surface of the support. Armrest device for construction equipment. The pillar is a pipe having a regular polygonal cross-sectional shape, the stay has a circular cross-sectional shape, and the central axis thereof is provided as the pivot axis.
The frictional engagement portions are arranged at equal intervals in the circumferential direction at the same number as the corners of the support, and the central portion of each side of the inner peripheral surface of the support is provided as the engagement surface. The armrest device for construction machines according to claim 2.   The holding means comprises a lock bush made of an elastic material fixed to the lower end of the stay, and the plurality of frictional engagement parts are formed on the outer peripheral part of the lock bush. Armrest device for construction machine according to the description. The lower portion of the lock bush has a plurality of divided pieces divided in the circumferential direction, and the frictional engagement portion is formed on the outer peripheral portion of the divided pieces,
A screw hole is formed on the center axis of the lower end surface of the stay, and a storage space surrounded by the divided pieces is formed in the lower portion of the lock bush, and the storage space is tapered upward. Containing the taper member,
The armrest device for a construction machine according to claim 4, wherein a bolt penetrating the upper portion of the taper member and the lock bush is screwed into a screw hole of the stay.   A guide bush is fixed to the upper end of the said support | pillar, The said stay is penetrated by the circular guide hole formed in the center of this guide bush, The construction in any one of the Claims 3-5 characterized by the above-mentioned. Armrest device for aircraft.

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