JP2009249811A - Windshield opening/closing device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a windshield opening/closing device of a construction machine, which utilizes a restoring force of a spiral spring as an assisting force in the opening of the windshield, and which can reduce a space necessary for the deformation of the spiral spring for accumulating the restoring force. <P>SOLUTION: A guide roller 10, which is provided at the upper end of the side portion of the windshield 4b, is composed of a pinion. A rack 12a meshing with the guide roller 10 (the pinion) is laid in the guide groove 12 into which the guide roller 10 is inserted. The upper end of the side portion of the windshield 4b is provided with a wrapping shaft 18 around which the spiral spring 15 is wound by its restoring force, and a winding shaft 19 around which the spiral spring 15 is wound from the side of the wrapping shaft 18 along with the rolling of the guide roller 10 on the guide groove 12 when the windshield 4b moves in a closing direction. A laying range of the rack 12a is set so that the guide roller 10 can roll on the rack 12a until the windshield 4b is fully opened from a closed state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a front window opening / closing device for a construction machine, which is provided in a construction machine such as a hydraulic excavator and allows opening and closing of a front window of a cab of the construction machine.

  The front window provided on the cab of a construction machine, such as a hydraulic excavator, is used for ventilation when the inside of the cab becomes too hot in the summer, etc., and to ensure that the sound outside the excavator can be clearly heard during work. Released. A conventional front window opening and closing device that realizes opening and closing of a front window has a guide roller provided on a side portion of the front window and a guide groove provided on a cab body and defining a track of the guide roller. By these guide rollers and guide grooves, the front window is supported so that it can be moved and opened from the state positioned at the front portion of the cab, that is, from the closed state toward the upper portion of the cab.

  As conventional techniques of this kind of construction machine front window opening and closing device, there are first and second conventional techniques described below. In addition to the guide roller and the guide groove described above, these first and second prior arts include auxiliary means for reducing the manpower required to open the front window (hereinafter referred to as “opening / closing force”).

The auxiliary means in the first prior art has a spiral spring as a source of the auxiliary force. A winding shaft around which the spiral spring is wound by its restoring force is provided on the rear side of the lower portion of the inner wall of the cab. The end of the spiral spring opposite to the winding shaft is coupled to the upper end of the front window in the closed state via a wire rope. An idle pulley is provided on the rear side of the upper part of the inner wall of the cab. Since the wire rope is hooked on the idle pulley, the wire rope extends from the upper end of the front window along the upper portion of the cab inner wall. A combination of a spiral spring, a winding shaft, a wire rope and an idle pulley is provided on the left and right sides of the cab to form a pair. When the front window is closed, the spiral spring is stretched to the front window via the wire rope. (Patent Document 1)
In the first prior art configured as described above, the spiral spring is stretched to the front window via the wire rope when the front window is closed. Thereby, the restoring force of the spiral spring which is going to wind around the winding axis is always given to the closed front window through the wire rope. Then, when the operator opens the front window, the spiral spring applies a part of the restoring force via the wire rope, that is, gives auxiliary force to the front window, and moves to the winding shaft as the front window moves in the opening direction. Wrap around. In the first prior art, the opening / closing force is reduced by applying a part of the restoring force of the spiral spring to the front window as an auxiliary force.

The auxiliary means in the second prior art also has a spiral spring as a source of the auxiliary force. The winding shaft around which the spiral spring is wound is provided in the rear portion of the upper part of the inner wall of the cab. The end of the spiral spring opposite to the winding shaft is connected to the side of the front window. That is, the second conventional technique does not indirectly apply a part of the restoring force of the spiral spring to the front window via the wire rope as in the first conventional technique. It is given directly. (Patent Document 2)
Japanese Utility Model Publication No. 3-65559 Japanese Utility Model Publication No. 6-73284

  By the way, the front window opening and closing device of a construction machine is required to be downsized in order to ensure the space in the cab as wide as possible and to improve the appearance in the cab.

  In the auxiliary means of the first prior art described above, a space required for the deformation of the spiral spring for accumulating the restoring force is secured from the rear part of the upper part of the cab inner side wall to the lower part of the cab. In the auxiliary means of the second prior art described above, the same space is secured from the front part to the rear part in the upper part of the cab inner wall. In the first and second prior arts, it is difficult to reduce the size because it is necessary to secure these spaces.

  An object of the present invention is a front window opening / closing device for a construction machine that uses a restoring force of a spiral spring as an auxiliary force when opening the front window, and a space required for the deformation of the spiral spring to accumulate the restoring force is provided. An object of the present invention is to provide a front window opening and closing device for a construction machine that can be reduced.

  In order to achieve the above-mentioned object, the front window opening and closing device of the construction machine according to the present invention is configured as follows.

[1] A front window opening and closing device for a construction machine according to the present invention includes a first guide roller provided at a side upper end of the front window of the cab, and a second guide provided at a side lower end of the front window of the cab. A roller, a first guide groove provided in the upper part of the main body of the cab and into which the first guide roller is inserted, and a second guide groove provided in the front part of the main body of the cab and into which the second guide roller is inserted. And the first and second guide rollers and the first and second guide grooves guide the opening of the front window from the front part of the cab toward the upper part of the cab, In the front window opening and closing device for a construction machine provided with auxiliary means for reducing the opening and closing force required to open the front window by a restoring force of a spring, the auxiliary means includes at least one of the first and second guide rollers. Pinio making up one side And a rack that is laid in at least one of the first and second guide grooves and meshes with the pinion, and the meshing of the pinion and the rack causes the pinion to move as the front window moves in the closing direction. A spiral spring that accumulates rotational force in the reverse direction of the pinion when rolling on the rack while forwardly rotating, until the front window is opened from the closed state by a predetermined amount, The laying range of the rack is set so that the pinion rolls on the rack.

  In this invention, when the pinion rolls on the rack while the pinion rotates in the forward direction as the front window moves in the closing direction due to the meshing of the pinion and the rack, the rotational force in the reverse direction of the pinion It has come to store. The rack laying range is set so that the pinion rolls on the rack from the closed state of the front window to the opened state by a predetermined amount. As a result, the space required for deformation of the spiral spring for accumulating the restoring force can be reduced as compared with the first and second prior arts described above.

[2] The auxiliary means described in “[1]” is provided in the front window, the winding shaft around which the spiral spring is wound by its restoring force, and the front window is moving in the closing direction. And a winding shaft that winds the spiral spring from the winding shaft side as the pinion rolls.

  In the present invention configured as described above, when the front window is in a closed state, the spiral spring is wound around the winding shaft and the restoring force in the direction returning to the winding shaft is stored, i.e., reversal of the pinion. The rotational force of the direction is stored. When the front window is opened, the pinion rolls while rotating on the rack in a range from the closed state to the opening of the predetermined amount. During this time, the spiral spring gradually recovers and winds around the winding shaft, and a rotational force in the reverse direction is applied to the pinion. This rotational force becomes an auxiliary force, and as a result, the opening / closing force is reduced. When closing the front window, the pinion rolls while rotating forward on the rack during the movement of the front window from the state where it is opened by a predetermined amount until it is completely closed. As a result, the rotational force in the reverse direction of the pinion is stored again.

  As described above, in the present invention, the spiral spring that stores the rotational force of the pinion is deformed between the winding shaft and the winding shaft provided in the front window. Thereby, the space required for the deformation of the spiral spring for accumulating the restoring force can be reduced as compared with the first and second conventional techniques.

[3] The rack described in “[1]” or “[2]” may be provided only in one of the first and second guide grooves. Thereby, the manufacturing cost is less than that in which the racks are provided in both the first and second guide grooves.

  According to the present invention, as described above, the space required for deformation of the spiral spring for accumulating restoring force can be reduced as compared with the first and second prior arts. Therefore, it can contribute to size reduction of the front window opening and closing device of the construction machine.

  First, a hydraulic excavator that is a construction machine according to an embodiment of the present invention will be briefly described with reference to FIG. FIG. 1 is a left side view of a hydraulic excavator that is a construction machine according to an embodiment of the present invention.

  As shown in FIG. 1, the excavator 1 has a traveling body 2 that travels by driving a crawler belt 2a. On the traveling body 2, a revolving body 3 including a cab 4 is provided. The cab 4 is provided at the left front portion of the revolving structure 3. A front work machine 5 in which a boom 5a, an arm 5b, and a bucket 5c are rotatably connected is provided on the right side of the cab 4, that is, in the front center of the revolving structure 3. The operator operates the operating lever device and the operating pedal device in the cab 4 to cause the traveling body 2, the revolving body 3, and the front work machine 5 to perform desired operations.

  Next, a front window opening and closing apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 2-1 is a diagram illustrating a state of the front window opening and closing device according to the embodiment of the present invention when the front window is closed. FIG. 2B is an enlarged view of the main part of FIG. FIG. 3-1 is a diagram illustrating a state when the front window is half open in the front window opening and closing device according to the embodiment of the present invention. 3-2 is an enlarged view of a main part of FIG. 3-1. FIG. 4-1 is a diagram illustrating a state when the front window is fully opened in the front window opening and closing apparatus according to the embodiment of the present invention. FIG. 4B is an enlarged view of the main part of FIG. FIG. 5 is an enlarged view showing the first guide roller (pinion) and a part of the first guide groove of the auxiliary means provided in the front window opening and closing apparatus according to the embodiment of the present invention. FIG. 6 is a perspective view showing a pinion, a spiral spring, a winding shaft, and a winding shaft of auxiliary means provided in the front window opening and closing device according to the embodiment of the present invention. In FIGS. 2-1 to 4-2, the right side is the front side of the cab, that is, the front-rear direction is opposite to that in FIG.

  As illustrated in FIGS. 2-1 and 2-2, the cab 4 of the excavator 1 includes a main body 4a and a front window 4b provided on the front surface of the main body 4a. The front window 4b has a window glass 4b1 that allows the front of the cab 4 to be visually recognized from a driver's seat (not shown), and a window frame 4b2 that surrounds the entire edge of the window glass 4b1.

  The front window opening and closing device according to the present embodiment includes a pair of first guide rollers 10 (only one shown) provided at the upper ends of the left and right side portions of the window frame 4b2, and each of the left and right side portions of the window frame 4b2. A pair of second guide rollers 13 (only one is shown) provided at the lower end and a pair of first guide grooves 12 provided on the left and right sides of the upper portion of the main body 4a of the cab 4 and having the first guide rollers 10 inserted therein. (Only one is shown) and a pair of second guide grooves 14B (only one shown) provided on the left and right sides of the front portion of the main body 4a of the cab 4 and having the second guide rollers 13 inserted therein. A handle 4b3 is provided at the lower part of the window frame 4b2. In the vicinity of the lower part of the front window 4b, the main body 4a of the cab 4 is provided with a lock device (not shown) for locking the closed front window 4b.

  In particular, in the front window opening and closing apparatus according to the present embodiment, as shown in FIG. 5, the first guide roller 10 is made of a pinion. A rack 12 a with which the first guide roller 10 is engaged is laid in the first guide groove 12. The laying range of the rack 12a is that the first guide roller 10 rolls on the rack 12a until the front window 4b is closed from the closed state to a state where it is opened by a predetermined amount, for example, until it is fully opened. Is set to

  In particular, in the front window opening and closing apparatus according to the present embodiment, the spiral springs 15 are provided on the left and right sides of the window frame 4b2. On the side of the window frame 4b2, the winding shaft 18 around which the spiral spring 15 is wound by its restoring force, and the rolling of the first guide roller 10 (pinion) when the front window 4b is moving in the closing direction. Accordingly, a winding shaft 19 for winding the spiral spring 15 from the winding shaft 18 side is provided. That is, the spiral spring 15 is configured so that the first guide roller 10 (pinion) rotates forward on the rack 12a as the front window 4b moves in the closing direction due to the engagement of the first guide roller 10 (pinion) and the rack 12a. When rolling, the first guide roller 10 (pinion) is provided to store the rotational force in the reverse direction. The length of the spiral spring 15 is set such that the spiral spring 15 is not wound from the winding shaft 18 to the winding shaft 19 while moving in the opening direction of the front window 4b.

  The first guide roller 10 (pinion) has a plurality of teeth 10b formed on the outer periphery of a cylinder 10a. A support shaft 17 that rotatably supports the first guide roller 10 is provided on the substrate 16 fixed to the side of the window frame 4b2 so as to protrude away from the window frame 4b2. The winding shaft 19 is formed of a cylinder that is coaxially and integrally formed with the cylinder 10 a of the first guide roller 10, and is positioned between the first guide roller 10 and the substrate 16. The winding shaft 18 is also provided on the substrate 16 so as to protrude in a direction away from the window frame 4b2.

  In the front window opening and closing device according to the present embodiment, the first guide roller 10 (pinion), the rack 12a, the spiral spring 15, the winding shaft 18, and the winding shaft 19 are connected to the front window 4b by the restoring force of the spiral spring 15. An auxiliary means for reducing the opening / closing force is configured.

  The front window opening and closing apparatus according to this embodiment configured as described above operates as follows.

  When the front window 4b is closed as shown in FIGS. 2-1 and 2-2, the spiral spring 15 is wound around the winding shaft 19, that is, the reverse rotation of the first guide roller 10 (pinion). The rotational force in the direction is accumulated.

  When an upward force is applied to the handle 4b3 of the front window 4b, the upper end portion of the front window 4b is guided by the first guide roller 10 (pinion) and the first guide groove 12, and the lower end portion of the front window 4b is By being guided by the second guide roller 13 and the second guide groove 14, the front window 4 b opens from the front part of the cab 4 toward the upper part of the cab 4. As a result, the front window 4b is fully opened as shown in FIG. 4-1, after being closed as shown in FIG. 2-1, through a half-open state as shown in FIG. 3-1.

  The first guide roller 10 (pinion) rolls in reverse on the rack 12a of the first guide groove 12 until the front window 4b is fully opened from the closed state. During this time, the winding shaft 19 also reverses, and the spiral spring 15 gradually recovers and winds around the winding shaft 18, and the first guide roller 10 (from the spiral spring 15 via the winding shaft 19 ( A rotational force in the reverse direction is applied to the pinion). This rotational force becomes an auxiliary force, and as a result, the opening / closing force of the front window 4b is reduced.

  When closing the front window 4b, the first guide roller 10 (pinion) rolls while rotating forward on the rack 12a of the first guide groove 12 during the movement of the front window 4b from the open state to the complete closing. Along with this, the winding shaft 19 also rotates forward to wind the spiral spring 15, and as a result, the rotational force in the reverse direction of the first guide roller 10 (pinion) is stored. This rotational force becomes an auxiliary force when the front window 4b is opened again.

  According to the front window opening and closing apparatus according to this embodiment, the following effects can be obtained.

  In the auxiliary means of the front window opening and closing apparatus according to the present embodiment, the deformation of the spiral spring 15 for storing the rotational force in the reverse direction of the first guide roller 10 (pinion), that is, for storing the restoring force, is the front window 4b. Between the winding shaft 18 and the winding shaft 19 provided in As a result, the space required for the deformation of the spiral spring for accumulating the restoring force can be reduced as compared with the first and second prior arts described above, thus contributing to the downsizing of the front window opening / closing device of the hydraulic excavator 1. it can.

  The front window opening and closing device according to the present embodiment is less expensive to manufacture than the one in which the rack 12a is provided in both the first and second guide grooves 12 and 14.

  In the front window opening and closing apparatus according to the above-described embodiment, the rack 12a is provided only in the first guide groove 12 for guiding the upper end portion of the front window, and the first guide roller 10 correspondingly corresponds to this. It consists of a pinion. A spiral spring 15 is provided so as to be deformed or restored as the first guide roller 10 rolls. The present invention does not limit the first guide roller made of a pinion, the rack, and the spiral spring. The rack 12a is provided only in the second guide groove 14B, the second guide roller 13 is made of a pinion, and the spiral spring is deformed and restored as the second guide roller 13 rolls. It may be provided. Even if the guide roller, the rack, and the spiral spring are provided as described above, the same effects as those of the front window opening and closing device according to the above-described embodiment can be obtained.

  Also, racks 12a are provided in both the first and second guide grooves 12, 14, both the first and second guide rollers 10, 13 are made of pinions, and the first, second guide rollers 10 , 13 may be provided with spiral springs. Since the guide roller, the rack, and the spiral spring formed of the pinion are provided in this manner, the number of spiral springs is larger than that in the above-described embodiment, so that the auxiliary force applied to the front window can be easily set large.

  In the front window opening and closing device according to the above-described embodiment, the laying range of the rack 12a is such that the first guide roller 10 (pinion) rolls on the rack 12a until the front window 4b is fully opened from the closed state. Therefore, an auxiliary force is always applied to the front window 4b until the front window 4b is fully opened from the closed state. The present invention does not limit the laying range of the rack. Since the force required to open the front window becomes smaller as the front window moves to the upper side of the cab, there is no problem even if no auxiliary force is applied to the front window before the front window is fully opened. Therefore, the laying range of the rack may be set so that the first guide roller (pinion) rolls on the rack only from the state in which the front window is closed until it is half-opened by a predetermined amount.

1 is a left side view of a hydraulic excavator that is a construction machine according to an embodiment of the present invention. It is a figure which shows a state when the front window is closed of the front window opening / closing apparatus which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIGS. It is a figure which shows a state when the front window is half open of the front window opening / closing apparatus which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIGS. It is a figure which shows a state when the front window is fully open of the front window opening / closing apparatus which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIGS. It is a figure which expands and shows the 1st guide roller (pinion) and a part of 1st guide groove of the auxiliary | assistant means with which the front window opening / closing apparatus which concerns on one Embodiment of this invention was equipped. It is a perspective view which shows the pinion, the spiral spring, the winding axis | shaft, and the winding axis | shaft of the auxiliary means with which the front window opening / closing apparatus which concerns on one Embodiment of this invention was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Running body 2a Crawler belt 3 Revolving body 4 Cab 4a Main body 4b Front window 4b1 Window glass 4b2 Window frame 4b3 Handle 5 Front work machine 5a Boom 5b Arm 5c Bucket 10 First guide roller (pinion)
10a cylinder 10b tooth 12 first guide groove 12a rack 13 second guide roller 14 second guide groove 15 spiral spring 16 substrate 17 support shaft 18 winding shaft 19 winding shaft

Claims (3)

A first guide roller provided at the upper end of the side of the front window of the cab, a second guide roller provided at the lower end of the side of the front window of the cab, and the first guide roller provided at the top of the main body of the cab. A first guide groove into which the guide roller is inserted; and a second guide groove provided at a front portion of the main body of the cab and into which the second guide roller is inserted. The first and second guide grooves guide the opening of the front window from the front of the cab toward the top of the cab,
In the front window opening and closing device of the construction machine comprising auxiliary means for reducing the opening and closing force required to open the front window by the restoring force of the spiral spring,
The auxiliary means includes a pinion that constitutes at least one of the first and second guide rollers, a rack that is laid in at least one of the first and second guide grooves and meshes with the pinion, and the pinion A spiral spring that accumulates rotational force in the reverse direction of the pinion when the pinion rolls on the rack while rotating forward as the front window moves in the closing direction due to meshing with the rack. Have
The construction laying range of the rack is set so that the pinion rolls on the rack from the closed state to the opened state by a predetermined amount. Window opening and closing device. In the construction machine front window opening and closing device according to claim 1,
The auxiliary means is provided on the front window and the winding shaft around which the spiral spring is wound by its restoring force, and the pinion rolls when the front window moves in the closing direction. A front window opening and closing device for a construction machine, comprising: a winding shaft for winding a spiral spring from the winding shaft side. In the invention according to claim 1 or 2,
The front window opening and closing device for a construction machine, wherein the rack is provided only in one of the first and second guide grooves.

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