JPH0619399Y2 - Seat equipment for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a seat device suitable for being installed in a cab of a construction machine.

[Conventional technology]

7 to 9 show a conventional seat apparatus for a construction machine used in a crane, a power shovel or the like. In these figures, reference numeral 1 is a stand with a support metal fitting 2 attached to the upper end thereof, the height of which is adjustable, and 3 is a pedestal for mounting a seat (not shown) on the upper surface. This pedestal 3 has its front end portion pivoted to the front end portion of the support metal fitting 2. It is pivotally supported via 4. Reference numeral 5 denotes a locking metal fitting attached to the rear end portion of the support metal fitting 2, and has a locking groove 6 having a shape of, for example, an E formed by connecting a plurality of locking portions as shown in FIG.

Reference numeral 7 denotes a release lever pivotally supported by the gantry 3, to which a pair of release arms 8 are welded. And the release arm 8
A stopper shaft 9 that can be engaged with and disengaged from an arbitrary locking portion of the locking groove 6 is laterally provided between the tip ends of the locking groove 6 and the engagement state between the shaft 9 and the locking portion is always maintained. Stopper shaft 9
A tension spring 10 for urging the coil is laid between the arm 8 and the pedestal 3. An urging spring 11 for urging the pedestal 3 upward is interposed between the upper portion of the stand 1 and the central portion of the pedestal 3.

A conventional construction machine seating device equipped with such parts is
It is possible to rotate the frame 3 around a pivot 4 and tilt it back and forth. In other words, while sitting in the seat,
By raising the operating lever 7 from the state shown in the figure,
At the same time that the release arm 8 is rotated clockwise,
The stopper shaft 9 can be removed from the locking portion in the middle of the locking groove 6. Then, in this state, the user moves the upper half of the body forward or backward to rotate the gantry 3 around the pivot 4, and then releases the operation lever 7. Then, the release arm 8 is rotated counterclockwise by the pulling force of the tension spring 10, so that the stopper shaft 9 of the release arm 8 rotates.
The pedestal 3 is held in an inclined state by being locked by the upper or lower locking portions of the gantry 3.

Therefore, with such a seat tilt structure, for example, in power shovel work, the seat is tilted forward when digging back and tilted backward when the upper part of the wall of the building is collapsed so that the posture of the seat is changed by the user. Can be adapted to.

In FIGS. 7 to 9, 12 is a tightening handle, 13
Is an adjuster bracket having a plurality of locking grooves, 14
Is an operation lever pivotally supported by the support fitting 2,
Is an adjuster arm having a locking shaft 15a at its tip end that rotates integrally with the operating lever 14 and is engaged with and disengaged from the locking groove; 16 denotes another arm that rotates integrally with the operating lever 14; Is a tension spring installed between the arm 16 and the support fitting 2, and these are members for adjusting the height of the stand 1.

[Problems to be solved by the device]

However, in the above-described conventional configuration, the engagement structure between the locking fitting 5 and the stopper shaft 9 serves both to support the load applied to the seat and to maintain the posture of the seat. For this reason, a considerable mechanical strength is required for the protruding portion between the plurality of locking portions provided in the locking groove 6 of the locking metal 5, and the stopper shaft 9 engaging and disengaging with the locking portion is also considerable. It requires mechanical strength and its diameter cannot be reduced.

Therefore, the interval between the engaging portions of the engaging groove 6 is inevitably large. Therefore, the conventional method has a small degree of freedom in adjusting the inclination of the seat, that is, the degree of freedom cannot be adjusted to various physical conditions of the user. was there.

It is an object of the present invention to provide a construction machine seat device capable of finely adjusting the seat tilt in the front-rear direction, facilitating forward tilting operation, and having good stability when seated.

[Means for Solving the Problems]

In order to solve the above-mentioned object, a seat device for a construction machine according to the present invention pivotally supports a center portion of a frame for mounting a seat on a support fitting attached to an upper part of a stand via a pivot shaft extending in the left-right direction, The pedestal is provided so as to be tiltable in the front-rear direction, and a push-up spring for urging the gantry upward between the pedestal and the support fitting is provided on the rear side of the pivot shaft,
A locking metal fitting is attached to the pedestal, a large number of teeth are provided on a radius around the pivot of the locking metal fitting, and a stopper metal fitting having a large number of teeth removably engaged with these teeth is described above. It is rotatably supported by a support fitting, and has a meshing means for meshing the both teeth to fix the position of the gantry, and a rotatable release lever for canceling the meshing of the both teeth. .

[Action]

In the present invention, the meshing means always presses and holds the stopper metal fittings against the locking metal fittings to hold a large number of teeth of these metal fittings in a meshed state. The meshing of the teeth prevents the pedestal from freely rotating about the pivot axis and fixes the position of the pedestal. Further, the release lever rotates the stopper fitting so that many teeth of the fitting are separated from many teeth of the locking fitting. Therefore, depending on how the weight is applied to the seat in a state where the teeth are disengaged from each other, the gantry is rotated around a pivot axis that pivotally supports the front-rear center portion of the gantry to tilt the seat forward or backward. be able to. Moreover, at this time, since the push-up spring always pushes up the seat from the lower rear part of the seat, when the user leans forward to lean toward the optimum forward leaning posture, the seat is slid on the waist of the user. It does not leave the user following the. Then, when the release lever is released when the seat angle has been changed as described above, the posture of the seat can be fixed by engaging a large number of teeth of the stopper fitting and the locking fitting by the action of the engaging means. . That is,
Since the posture of the seat is maintained by meshing a large number of teeth as described above, the posture of the seat can be finely adjusted with the angle corresponding to shifting the meshing of these teeth by one pitch as the minimum adjustment angle. Also, when the release lever is released, as described above, the seat follows the user's floating waist when leaning forward, so the user drives the construction machine while observing the work situation immediately below the front of the cab. In this case, it is possible to easily and quickly tilt the seat forward to a desired angle to deal with the work. Further, since the seat is pivotally supported at the central portion in the front-rear direction, the position of the center of gravity of the user is less likely to deviate from the pivot axis regardless of whether or not the seat is tilted, and therefore the seat can be seated stably.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, 21 is a fixed cylinder 21a and a movable cylinder 21b having a smaller diameter than this.
The coil spring 22 (see FIG. 2) that pushes up the movable cylinder 21b is built in the stand. The movable cylinder 21b is prevented from rotating in the circumferential direction by a tightening handle 23 whose shaft portion is inserted through the fixed cylinder 21a. A support fitting 33 is attached to the upper end of the movable barrel 21b.

The support fitting 33 is formed by mounting a bracket 25 on the lower surface of the front part of which a rotary shaft 24 along the left-right direction is rotatably mounted horizontally, and a spring receiver 26 on one side of the rear part. The upper surfaces of the pair of left and right support walls 33a that are bent upward of the support fitting 33 are substantially V-shaped in the front-rear direction.

An operation lever 27 protruding forward is provided at an intermediate portion of the rotating shaft 24.
Is fixed and the adjuster arm 28 is fixed. At the tip of this arm 28, the locking shaft 2
9 is attached to and selectively engaged with and disengaged from a plurality of locking grooves 30a (see FIG. 1) of the adjuster bracket 30 attached to the front outer surface of the fixed barrel 21a. Reference numeral 48 in FIGS. 1 to 3 denotes a cover member that covers the adjuster arm 28 from the front side.

Therefore, the height of the stand 1 is the same as that of the operation lever 27.
By rotating the adjuster arm 28 integrally with the rotary shaft 24 via the locking shaft 29 and replacing the locking shaft 29 with the locking groove 30a, the adjustment is made in multiple steps.
By such adjustment, the height of the seat device can be changed to an optimal height for work according to the extension of the user.

It should be noted that another arm 31 is attached to one end of the rotary shaft 24, and a tension coil spring 32 is installed between the arm 31 and the spring receiver 26. Due to the biasing force of the spring 32, the engagement state between the locking shaft 29a and the locking groove 30a of the adjuster bracket 30 is always maintained.

Then, a pivot 34 extending in the left-right direction is laterally provided across the pair of support walls 33a of the support fitting 33. A central portion of the pedestal 35 in the front-rear direction is pivotally supported on the support fitting 33 via the pivot 34, and the pedestal 35 is provided so as to be tiltable back and forth about the pivot 34. As shown in FIG. 1, a seat 36 including a seat portion and a backrest portion is mounted on the frame 35.

A push-up spring 37 for urging the gantry 35 upward is interposed between the support fitting 33 and the gantry 35.
As this spring 37, for example, a leaf spring is used as shown in FIGS.
It is bolted to 3, and the upper end is pressed against the inner surface of the gantry 35 to push the gantry 35 rearward of the pivot 34. The push-up spring 37 may be a spring material such as a coil spring other than the leaf spring.

On the right side surface of the gantry 35, for example, a locking metal fitting 38 is attached by means such as bolting. This metal fitting 38 is provided so as to project downward, and its lower end surface is on a radius centered on the pivot 34 and has a large number of teeth 39 (see FIG. 4).
Are continuously provided. The module is small in order to provide a large number of teeth 39.

Corresponding to the locking metal fitting 38, a support metal fitting 40 is attached to one side portion of the support metal fitting 33 by means of bolting or the like, and a stopper metal fitting 42 is rotatable on the metal fitting 40 via a pivot 41. Is pivoted to. Stopper bracket 4
A release lever 43 is connected to the front end portion of 2 by welding or the like, and a large number of teeth 44 detachably engaged with the teeth 39 are provided on the rear upper surface of the stopper fitting 42.
(See FIG. 4) are provided. The large number of teeth 44 is a part of the internal gear and is formed in a small module like the teeth 39.

A spring 45 is installed between the right end portion of the pivot 34 that penetrates the locking metal fitting 38 and the stopper metal fitting 42 so as to urge the stopper metal fitting 42 upward to mesh the teeth 39 and 44. Has been done. In addition,
A leaf spring that pushes up the stopper fitting 42 from below can be used as the spring 45.

Further, the tip end side of the release lever 43 is projected forward so that it can be pulled up by the user, and the support fitting 40 is provided with a stopper pin 46 for restricting the pulling up operation of the operation lever 43. ing. The release lever 43 and the stopper fitting 42 may be integrally formed. Further, 47 in FIG. 3 is a spring cover.

A case where the inclination of the seat 36 is adjusted in the seat device having the above configuration will be described.

A user sitting on the seat 36 and operating a construction machine such as a power shovel first grasps the front end side of the release lever 43 and pulls it up. Then, the stopper fitting 42 is rotated counterclockwise in FIG. 4 about the pivot 41,
Since the large number of teeth 44 and the large number of teeth 39 of the locking fitting 38 are disengaged, the gantry 35 to which the seat 36 is attached can freely rotate.

Next, the user moves the upper body back and forth in this state, and tilts the seat 36 and the gantry 35 forward or backward around the pivot 34 so that the user is in the most convenient state to work. At this time, the pedestal 35 is attached to the pivot 3
Since it is urged upward by the push-up spring 37 so as to rotate in the counterclockwise direction about 4, the pedestal 35 is not completely free, and therefore the seat 36 and the pedestal 35 follow the movement of the user. It is a good one.

Then, in the optimum tilted state, by releasing the hand from the release lever 43, the stopper fitting 42 is pulled up by the urging force of the spring 45 and the release lever 43 is returned to the original position. Thereby, the stopper metal fitting 4
The two teeth mesh with the teeth 39 of the locking metal fitting 44, and
The posture of the seat 36 can be fixed.

Therefore, when the user sitting on the seat 36 and operating the construction machine wants to perform the operation while visually observing the work situation immediately below the front of the operator's cab, he or she operates the release lever 43 to operate the teeth 39 and the teeth 44. And the waist is lifted from the seat 36. As a result, the seating load of the seat 36 is reduced to an unloaded state, so that the pedestal 35 and the seat 36
Is automatically turned around the pivot 34 by the spring force of the push-up spring 37 in the forward tilting direction and is selfish. Therefore, in this state, the user selects a desired forward tilt angle and releases the release lever 43. Then, the spring 45
The stopper lever 42 is pulled up by the urging force of the stopper lever 42, the release lever 43 is returned to the original position, and the teeth 44 of the stopper bracket 42 mesh with the teeth 39 of the locking member 38, so that the seat 36 is set to the optimum forward tilt angle. Can be fixed. As described above, in the forward leaning operation, the user only needs to operate the release lever 43 and lift the waist from the seat 36. Therefore, since the seat 36 can be easily tilted forward, the work can be promptly performed.

In the tilt adjustment, each tooth 39, 44 is provided with a small number of modules, and as described above, the teeth 39, 44 are engaged with each other to fix the posture of the seat 36. 1 mesh of teeth 39 and 44
By using the angle corresponding to the pitch shift as the minimum adjustment angle, the posture of the seat 36 can be finely adjusted by the above procedure. Therefore, in combination with the height adjustment of the stand 1 by the inclination adjustment as described above, the seat 36
Since the posture of the seat can be adjusted to the most easy-to-use state according to the user, it is possible to provide a seat device with good usability. In addition, in this seat device, since the gantry 35 supporting the seat 36 is pivotally supported at the center portion in the front-rear direction, the position of the center of gravity of the user can be deviated from the pivot 34 regardless of the inclination. Therefore, the seat can be seated with good stability.

Further, the present invention may be configured as shown in FIG.

That is, the release lever 43 is rotatably attached to the end portion of the pivot shaft 34 that penetrates the engaging fitting 38, and the engaging body 51 such as a rotating roller is attached to the bent portion. The release lever 43 is urged in the counterclockwise direction in the figure by a tension spring 53 that extends over the release lever 43 and a support fitting 52 fixed to the support fitting 33. A stopper metal fitting 42 is rotatably supported by the support metal fitting 33 via the support metal fitting 52, and a cam surface 5 with which the locking body 51 is engaged and disengaged is attached to a tip end portion of the metal fitting 42.
4 and a locking step 55 located at the lower end of the cam surface 54. The rotation locus A of the locking body 51 comes closest to the cam surface 54 at the position where it engages with the locking step portion 55, and as it moves upward from this locking step portion 55, the cam surface 5 moves.
It is gradually moving away from 4. The rotation base end side portion of the release lever 43, the locking body 51, the tension spring 53,
The cam surface 54 and the locking step portion 55 form a meshing unit that meshes the teeth 39 and 44 to fix the position of the frame 35. Further, reference numeral 56 in the drawing denotes a stopper projection provided on the support fitting 52, which restricts the downward rotation of the stopper fitting 42. The configuration other than the above is the same as the configuration of the above-described one embodiment including the not-shown portion, but the support fitting 40 shown in the above-described one embodiment is
Of course, the pivot 41, the stopper fitting 42, the release lever 43, the spring 45, and the stopper pin 46 are not used.

In this embodiment, by pulling up the release lever 43 from the state shown in the drawing, the locking body 51 is disengaged from the locking step portion 55 and follows the cam surface 54, and soon the stopper body 42 is separated from the cam surface 54. Since the restraint is released, the stopper fitting 42 pivots downward due to its own weight and separates from the locking fitting 38 as shown by a two-dot chain line. Therefore, the pedestal 3
5 can be freely rotated. Then, when the release lever 43 is lowered with the position of the mount 35 being determined, the lever 4
With the downward rotation of 3, the locking body 51 contacts the cam surface 54 and is locked by the locking step 55 in due course. Therefore,
The stopper metal fitting 42 is forcibly pushed up to the locking metal fitting 38 side, whereby the teeth 39 and 44 can be surely engaged with each other and the state can be maintained. In this way, it is not necessary to apply a large pulling spring force to the stopper fitting 42 in order to ensure that the teeth 39, 44 are held in mesh with each other. Therefore, the operation force when pulling up the release lever 43, that is, when disengaging the teeth 39 and 44 from each other is small, and it is easy to handle. Needless to say, this embodiment can also achieve the intended purpose of the present invention by the same operation as that of the above-mentioned one embodiment.

[Effect of device]

According to the present invention configured as described above, the seat can be tilted forward and backward, and the posture of the seat can be adjusted according to the work of the construction machine. In the forward leaning operation of the seat when performing work while visually observing the work situation immediately below the front of the driver's cab, the seat can be easily leaned forward to a desired angle simply by operating the release lever and lifting the hips from the seat. You can work quickly. Further, when adjusting the inclination of the seat, the fixing of the pedestal rotatable about the pivot axis is fixed to the supporting metal fitting by a large number of teeth provided on a radius of the locking fitting attached to the pedestal about the pivot axis. Since this is done by meshing with a large number of teeth provided on the stopper metal fitting, the angle corresponding to shifting the meshing of these teeth by one pitch is set as the minimum adjustment angle, and the inclination of the seat is finely adjusted. be able to. Also, since the pedestal supporting the seat is pivotally supported at the central portion in the front-rear direction, regardless of whether it is inclined,
The position of the user's center of gravity is less likely to deviate from the axis
Therefore, it is possible to sit stably.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a IV-IV line in FIG. FIG. 5 is a side view of the tilt portion viewed from the direction, and FIG. 5 is a sectional view taken along the line VV in FIG. FIG. 6 is a side view of a tilt portion showing another embodiment of the present invention. 7 to 9 show a conventional example, FIG. 7 is a side view, FIG. 8 is a partial plan view, and FIG. 9 is a front view. 21 ... Stand, 33 ... Supporting metal fitting, 34 ... Axis,
35 ... Stand, 36 ... Seat, 37 ... Push-up spring,
38 ... Locking fitting, 39 ... Tooth, 42 ... Stopper fitting, 44 ... Tooth, 43 ... Release lever, 45 ... Spring (meshing means).

 ─────────────────────────────────────────────────── ───Continued from the front page (72) Inventor Yoshio Mochizuki, 3-32-23 Aoi, Adachi-ku, Tokyo, Takara Industry Co., Ltd. Tani Heavy Industries Co., Ltd. (56) Reference JP-A-59-209925 (JP, A) JP-A-63-300712 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A support bracket attached to an upper part of a stand is pivotally supported by a central portion in the front-rear direction for mounting a seat via a pivot shaft extending in the left-right direction, and the mount is provided so as to be tiltable in the front-rear direction. A push-up spring for urging the gantry upwardly behind the pivot is interposed between the pedestal and the supporting metal fitting, and a locking metal fitting is attached to the gantry, and the pivot of the locking metal fitting is centered. A large number of teeth are provided on the radius, and a stopper fitting having a large number of teeth that are detachably engaged with these teeth is rotatably supported on the support fitting, and the two teeth are engaged with each other to engage the pedestal of the gantry. A seat device for a construction machine, comprising a meshing means for fixing a position, and a rotatable release lever for canceling meshing of the both teeth.