JP3732728B2 - Construction machinery cab - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab for construction machinery that is suitably used for, for example, a hydraulic excavator, a hydraulic crane, and the like.
[0002]
[Prior art]
Generally, a hydraulic excavator as a construction machine includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided so as to be able to move up and down at a front portion of the upper revolving body. It is roughly constituted by. Further, a cab as a driver's cab where an operator gets in is provided on the frame of the upper swing body.
[0003]
The hydraulic excavator cab includes a base frame formed of a frame-like body, left and right front pillars positioned at the front and left corners of the base frame, and a rear side of the base frame. The left and right rear pillars located at the left and right corners, the left and right roof pillars connecting the front pillar and the upper part of the rear pillar in the front and rear directions, and the upper sides of the left and right front pillars. The left and right front pillars are connected to the left and right rear pillars, the upper left and right rear pillars are connected to the left and right sides, and the left and right front pillars and roof pillars are openable. The front window is roughly configured.
[0004]
In addition, the windshield is provided with windshields, a wind frame that can be moved between the front pillar and the roof pillar, and both left and right sides of the wind frame. The windshield is arranged between the front pillars. And a locking device that locks each of the closed window position and the opened window position disposed between the roof pillars. Here, the lock device is constituted by a lock pin that is located on the upper side of the window frame and is slidable in the left and right directions, for example.
[0005]
The left and right lock pins are provided on the upper side of each front pillar by sliding the left and right outwards at the closed window position where the front window is located between the front pillars. Engages and locks the pin hole to restrict the opening and closing of the front window.
[0006]
Also, when opening the front window, the lock pins provided on the left and right are sequentially slid inward to retract the tip, thereby pulling out the engagement hole and releasing the lock. In this state, the front window can be opened by moving the front window to the roof pillar side by each roller.
[0007]
On the other hand, when the front window is located between the roof pillars, the left and right lock pins protrude outward in the left and right directions to engage the pin holes provided on the rear side of each roof pillar. Can be locked to restrict the opening and closing operation of the front window.
[0008]
[Problems to be solved by the invention]
By the way, in the cab for a hydraulic excavator according to the above-described prior art, when the front window is opened and closed, the left lock pin and the right lock pin are operated separately, and each lock pin is inserted into the engagement hole or detached. I have to do it. For this reason, when the front window is opened and closed, two unlocking operations and two locking operations are required each time, so that the opening and closing operation of the front window is troublesome and the operability is lowered. There is.
[0009]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to release the lock of the front window by a single operation and to improve the operability when opening and closing the front window. An object of the present invention is to provide a cab for a construction machine that can be used.
[0010]
[Means for Solving the Problems]
A cab for a construction machine according to a first aspect of the present invention includes a base frame made of a frame-shaped body, left and right front pillars positioned on the left and right corners on the front side of the base frame, and the base Left and right rear pillars located at the left and right corners located on the rear side of the frame, left and right roof pillars that connect the front pillar and the upper part of the rear pillar forward and rearward, and left and right Between the left and right front pillars, the left and right front pillars, and the left and right front pillars and roof pillars. And a front window that can be opened and closed.
[0011]
  In order to solve the above-described problem, the invention adopts the feature of the structure of claim 1 in that the windshield is provided with a windshield and is movable between the front pillar and the roof pillar. A lock device provided on both the left and right sides of the frame and locking the front window at the closed window position between the front pillars and the open window position between the roof pillars, and the rear side of the window frame A lock release bar that extends in the left and right directions and is attached to the left and right locking devices at both ends, and is unlocked by rotating the left and right locking devices.The left and right locking devices engage and disengage from a closing window side hook provided on the front pillar and a closing window side hook provided on the roof pillar. A window opening side hook, and the lock release bar is configured to rotate the window closing side hook and the window opening side hook in conjunction with each other.That is.
[0012]
  With this configuration, when the front window is closed to the front, the front window is placed between the left and right front pillars.And engage the closed window side hook with the closed window side engagement pin.To do. As a result, the left and right locking devices lock the front window in the closed window position. When opening the front window to the roof sideIn, Grab the unlock barClose the window side hookRotation operationShi,The window side hook is detached from the window side engaging pin. ThisSince the lock release bar can release the locks of the left and right lock devices together, the lock of each lock device can be released by a single operation.
[0013]
  Then, by lifting the front window and moving it to the left and right roof pillars, the front window can be opened to the roof. Also open the front windowMove backWhenBy engaging the open side hook with the open side engaging pin,The front window can be locked in the open position by the left and right locking devices.
[0014]
  Furthermore, when unlocking the left and right locking devices to close the front window forward,Just like when openingUnlock barBy fenestration side hookRotating operationThen, the window side hook is detached from the window side engaging pin. thisTo unlock the left and right locking devices together.The front window can be closed to the front sideThe
[0015]
  According to the invention of claim 2,Lock devices are located on the upper side of the wind frame and are provided on both the left and right sides.The unlock bar is located within the field of view that the operator can obtain through the windshield with the windshield in the closed window position.On the upper sideIt is located in a position that is out of place.
[0016]
  With this configuration, even when the front window is located at the closed window position, the lock release bar is not visible to the operator.Out of the field of viewTherefore, it is possible to give a good field of view to the operator during work.
[0020]
  Claim3As in the present invention, the closed window side hook and the opened window side hook may be integrally formed on one hook member.
[0021]
  Claim4According to the present invention, the left and right locking devices are provided on a bracket provided on the window frame and rotatably provided on the bracket.TheClosed side hook andOpenA hook member made up of a window side hook, a lever member that is pivotally provided on the bracket and rotates the window closing side hook and the window opening side hook, and the window closing side hook and the window opening side hook are engaged with the engaging pin. The hook spring is biased in the locking direction and the lever spring is biased in the locking direction, and the lock release bar is attached to the left and right lever members.
[0022]
With this configuration, when the front window is closed to the front side, the closing window side hook is rotated against the hook spring and is engaged with the closing window side engagement pin by the hook spring. Further, when the front window is opened to the roof side, the lever member is rotated in the unlocking direction opposite to the locking direction against the lever spring, so that the window closing hook is detached from the window closing engagement pin. Thereby, the lock | rock of a locking device is cancelled | released and a front window can be moved to the roof side. Further, when the front window is opened, the window opening side hook is rotated against the hook spring and is engaged with the window opening side engaging pin by the hook spring. Then, when the front window is moved to the front side and closed, similarly to the case of opening, the lever member is turned in the unlocking direction to release the window side hook from the window side engaging pin.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a construction machine cab according to an embodiment of the present invention will be described in detail with reference to FIGS.
[0024]
Reference numeral 1 denotes a lower traveling body of a hydraulic excavator, and 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be able to swivel. 3 is provided to be able to move up and down.
[0025]
The upper swing body 2 includes a swing frame 4, a cab 11 described later mounted on the left side of the front portion of the swing frame 4, and a right side to a rear side of the cab 11 as shown in FIGS. 2 and 3. The outer cover 5 provided on the revolving frame 4, the counterweight 6 attached to the rear end portion of the revolving frame 4, and the left and right directions on the revolving frame 4 located on the rear side of the cab 11. The engine 7 or the like mounted in a horizontally placed state extending in a straight line is generally configured.
[0026]
Reference numeral 11 denotes a cab mounted on the left side of the front part of the revolving frame 4. The cab 11 defines a driver's cab in which an operator gets in, and has a driver's seat and various levers (all not shown). Etc. are arranged. 4 and 5, the cab 11 is roughly constituted by a cab frame 12, a door 38, a rear panel 40, a side panel 41, a roof panel 42, a front window 50, and the like which will be described later.
[0027]
Reference numeral 12 denotes a cab frame that forms a framework structure of the cab 11. The cab frame 12 includes a base frame 13, front pillars 22 and 23, rear pillars 24 and 25, a roof pillar 26, which will be described later, as shown in FIGS. 27, front connection members 28 and 29, rear connection members 30 and 31, a front connection frame 32, a rear connection frame 33, a center pillar 35, and the like. In addition, regarding the detailed shapes of the front pillar, rear pillar, roof pillar, front connecting member, and rear connecting member that are symmetrical to the left and right, the members arranged on the right side are illustrated, and the reference numerals of the left members are described in parentheses. ing.
[0028]
Reference numeral 13 denotes a base frame that forms the base of the cab 11, and as shown in FIG. 10, the base frame 13 has four attachments disposed at the front left side, the front right side, the rear left side, and the rear right corner. A frame is formed by the bases 14, 15, 16, 17, the left and right vertical frames 18, 19 connecting the mounting bases 14, 15, 16, 17, and the front and rear horizontal frames 20, 21. Is formed.
[0029]
Here, the front mounting bases 14 and 15 are formed by substrates 14A and 15A formed in a substantially triangular shape, and fitting projections 14B and 15B having a convex cross section projecting upward from the substrates 14A and 15A. ing. On the other hand, the rear mounting bases 16 and 17 are formed by substrates 16A and 17A formed in a substantially triangular shape, and fitting protrusions 16B and 17B having semicircular cross sections protruding upward from the substrates 16A and 17A. ing.
[0030]
Reference numeral 22 denotes a left front pillar located at the front corner of the base frame 13 and arranged at the left corner. Reference numeral 23 denotes a right front pillar located at the front side of the base frame 13 and arranged at the right corner. The front pillar 22 and the right front pillar 23 are curved in a substantially square shape toward the front side, and when assembled, a roller groove for guiding a roller 53 of a front window 50 (to be described later) on the inner surface in the left and right directions. 22A and 23A are integrally formed.
[0031]
Here, each of the left front pillar 22 and the right front pillar 23 uses a single hollow steel pipe having a circular cross section, and the steel pipe is subjected to a drawing process, for example, between a plurality of rollers. 22A and 23A are formed by machining as a deformed steel pipe having a substantially U-shaped cross section formed integrally.
[0032]
Further, as shown in FIGS. 8 and 9, the front pillars 22 and 23 are provided with mounting holes 22 </ b> B and 23 </ b> B that are located in the middle portion in the length direction. Further, stoppers 22C and 23C made of different members are attached to the attachment holes 22B and 23B in order to determine an end point position when a front window 50 described later is closed. Further, the stoppers 22C and 23C are formed with groove portions 22C1 and 23C1 for guiding the front window 50 to the front side so that the lower side of the windshield 52 is pressed against a seal rubber 43 described later when the front window 50 is closed. ing.
[0033]
The lower front side of the left front pillar 22 configured in this manner is fitted to the fitting protrusion 14B of the left front mounting base 14, and in this state, is fixed by welding means. Further, the lower end side of the right front pillar 23 is fitted into the fitting protrusion 15B of the right front mounting base 15, and in this state, is fixed by welding means.
[0034]
On the other hand, 24 is a left rear pillar located at the left corner of the base frame 13 and 25 is a right rear pillar located at the rear corner of the base frame 13 and arranged at the right corner. Each of the rear pillars 24 and 25 is formed by being gently bent so that the lower side is shifted forward with respect to the upper side, and similarly to the front pillars 22 and 23, each of the rear pillars 24 and 25 is constituted by one deformed steel pipe. The lower end of the left rear pillar 24 is fitted to the fitting protrusion 16B of the left rear mounting base 16, and is fixed by welding means in this state. Further, the lower end side of the right rear pillar 25 is fitted into the fitting protrusion 17B of the right rear mounting base 17, and is fixed by welding means in this state.
[0035]
26 is a left roof pillar that extends forward and rearward from the upper part of the left front pillar 22 and left rear pillar 24, and 27 is a right that extends forward and rearward from the upper part of the right front pillar 23 and the right rear pillar 25. Each of the roof pillars is shown, and the left roof pillar 26 and the right roof pillar 27 are gently curved so that the middle portion in the length direction protrudes upward. The left roof pillar 26 and the right roof pillar 27 are integrally formed with roller grooves 26A and 27A for guiding the rollers 53 of the front window 50 on the inner surfaces in the left and right directions.
[0036]
Here, the left roof pillar 26 and the right roof pillar 27 are formed of the same shaped steel pipe as the left front pillar 22 and the right front pillar 23 described above, both of which are bent by bending one shaped steel pipe. Is formed.
[0037]
The front end of the left roof pillar 26 is attached to the upper end of the left front pillar 22 via a left front connecting member 28 described later, and the rear end of the left roof pillar 26 is connected to the upper end of the left rear pillar 24 via a left rear connecting member 30 described later. Attached to the part. On the other hand, the front end of the right roof pillar 27 is attached to the upper end of the right front pillar 23 via a right front connecting member 29 described later, and the rear end is connected to the upper end of the right rear pillar 25 via a right rear connecting member 31 described later. Attached to the part.
[0038]
28 denotes a left front connecting member provided between the left front pillar 22 and the left roof pillar 26, and 29 denotes a right front connecting member provided between the right front pillar 23 and the right roof pillar 27. The connecting member 28 and the right front connecting member 29 have a rectangular tube shape that is curved in an arc shape. Further, the left and right front connecting members 28 and 29 extend continuously from the upper side of the left and right front pillars 22 and 23 and constitute a part of the front pillars 22 and 23.
[0039]
Here, the left and right front coupling members 28 and 29 have roller grooves 22A and 23A of the front pillars 22 and 23 and the left roof pillars 26 and 27 on the inner surfaces in the left and right directions, as shown in FIG. The roller grooves 28A and 29A continuous with the roller grooves 26A and 27A are formed, and the windshield 52 upper side of the windshield 50 is located at a substantially intermediate position between the roller grooves 28A and 29A when the windshield 50 is closed. Grooves 28A1 and 29A1 are formed to guide the front side so as to be pressed against the seal rubber 43.
[0040]
The left front connecting member 28 is fitted with one end side to the upper end of the left front pillar 22 and fixed by welding means, and the other end side is fitted to the front end of the left roof pillar 26 and fixed by welding means. The left front pillar 22 and the left roof pillar 26 can be connected. On the other hand, the right front connecting member 29 has one end fitted to the upper end of the right front pillar 23 and fixed by welding means, and the other end is fitted to the front end of the right roof pillar 27 and fixed by welding means. The right front pillar 23 and the right roof pillar 27 can be connected.
[0041]
Next, 30 is a left rear connecting member provided between the left rear pillar 24 and the left roof pillar 26, and 31 is a right rear connecting member provided between the right rear pillar 25 and the right roof pillar 27. The rear connecting member 30 and the right rear connecting member 31 are formed in a box shape having a hollow inside.
[0042]
The left rear connecting member 30 is fitted with the rear end of the left roof pillar 26 at the front side and fixed by welding means, and the lower surface side is fitted at the upper end of the left rear pillar 24 and fixed by welding means. The left rear pillar 24 and the left roof pillar 26 can be connected. On the other hand, the right rear connecting member 31 has a front side fitted to the rear end of the right roof pillar 27 and fixed by welding means, and a lower surface side fitted to the upper end of the right rear pillar 25 and fixed by welding means. The right rear pillar 25 and the right roof pillar 27 can be connected.
[0043]
Reference numeral 32 denotes a front connecting frame (shown in FIG. 7) provided on the upper side of the front portion of the cab frame 12, and the front connecting frame 32 is composed of a long plate body extending in the left and right directions. A U-shaped bending process is applied. The front connection frame 32 is fixed to the left and right front connection members 28 and 29 by welding means at both ends thereof, whereby the front pillars 22 and 23 are connected via the front connection members 28 and 29. The upper side is connected to the left and right.
[0044]
Reference numeral 33 denotes a rear connection frame provided on the upper rear portion of the cab frame 12, and the rear connection frame 33 is, for example, a long rectangular tube shape that extends left and right by fixing a plurality of panel members by welding means. I am doing. The rear connecting frame 33 is fixed to the left and right rear connecting members 30 and 31 by welding means at both ends thereof, whereby the rear pillars 24 and 25 are connected to the rear pillars 24 and 25 via the rear connecting members 30 and 31, respectively. The upper side is connected left and right.
[0045]
Reference numeral 34 denotes another connecting frame that is located at the rear of the cab frame 12 and is spaced apart from the lower side of the rear connecting frame 33. The connecting frame 34 has a plate-like cross-sectional shape extending in the left and right directions. It is formed in a rod shape by bending it into two. Both ends of the connecting frame 34 are fixed to the upper and lower intermediate portions of the left and right rear pillars 24 and 25 by welding means, thereby connecting the intermediate portions of the rear pillars 24 and 25 in the left and right directions. is doing.
[0046]
Reference numeral 35 denotes a center pillar provided on the left side surface of the cab frame 12. The center pillar 35 is hollow by fixing an inner panel 36 and an outer panel 37, which are pressed into a substantially L shape, by welding means. It is formed as a plate. The center pillar 35 includes a pillar portion 35A that extends upward and downward, and a side panel portion 35B that extends rearward from the lower side of the pillar portion 35A.
[0047]
In the center pillar 35 configured in this manner, the pillar portion 35A is disposed at an intermediate position in the front and rear directions, and the lower ends of the pillar portion 35A and the side panel portion 35B are welded to the left vertical frame 18 of the base frame 13. The upper end of the pillar portion 35A is fixed to the left roof pillar 26 by welding means.
[0048]
Reference numeral 38 denotes a door provided between the center pillar 35 and the left front pillar 22. As shown in FIG. 4, the door 38 is hinged to the center pillar 35 so that it can be opened and closed via hinges 39, 39. ing.
[0049]
Reference numeral 40 denotes a rear panel made of a metal plate provided over the left and right rear pillars 24 and 25 so as to cover the rear side of the cab frame 12, and reference numeral 41 denotes a vertical frame 19 which covers the right side of the cab frame 12 and the right side. A side panel made of a metal plate fixed to the front pillar 23 and the right rear pillar 24, and a roof panel made of a metal plate fixed to the left and right roof pillars 26 and 27, the front connection frame 32, and the rear connection frame 33, respectively. Show.
[0050]
43 is a seal rubber provided on the front side of the cab frame 12, and the seal rubber 43 is a frame-like rubber member fixed across the left and right front pillars 22 and 23, the front end of the roof panel 42, and the front side frame 20. Is formed by. And the sealing rubber 43 seals between the below-mentioned windshields 44 and 52, and prevents permeation of rain water etc. from the outside.
[0051]
Reference numeral 44 denotes a lower windshield positioned on the lower side of the front window 50 and attached to the horizontal frame 20 and the left and right front pillars 22 and 23. Reference numeral 45 denotes a gap between the rear connecting frame 33 and the rear panel 40. The rear glass mounted on the left and right rear pillars 24 and 25, 46 is a left side glass provided between the center pillar 35 and the left rear pillar 24, and 47 is provided between the right front pillar 23 and the right rear pillar 25. Each right side glass is shown.
[0052]
Reference numerals 48 and 48 denote closing window side engaging pins provided on the left and right front connecting members 28 and 29 forming a part of the left and right front pillars 22 and 23, respectively. As shown in FIG. 9, it is located on the inner side surface in the left and right directions so as to protrude inward. Then, each engagement pin 48 engages and disengages a closing window side hook 58 </ b> A of a locking device 54, 55 provided on the front window 50 described later.
[0053]
49 and 49 are fenestration side engaging pins provided on the rear side of the left and right roof pillars 26 and 27, and the fenestration side engaging pins 49 are provided on the inner side surfaces in the left and right directions as shown in FIG. It is located so as to protrude inward. Then, the opening-side hooks 58B of the locking devices 54 and 55 provided on the front window 50 are engaged with and disengaged from the respective engagement pins 49.
[0054]
Reference numeral 50 denotes a front window provided on the front side of the cab frame 12. The front window 50 includes a window frame 51, a windshield 52, a roller 53, lock devices 54 and 55, a lock release bar, which will be described later, as shown in FIG. 62 is roughly constituted.
[0055]
A wind frame 51 is movable between the front pillars 22 and 23 and the roof pillars 26 and 27. The wind frame 51 includes an upper frame body 51A and a lower frame body 51B as shown in FIGS. The left frame body 51C and the right frame body 51D are formed in a rectangular frame shape extending upward and downward.
[0056]
Reference numeral 52 denotes a windshield provided on the window frame 51, and the windshield 52 is fixed to the frame bodies 51A, 51B, 51C, 51D so as to cover the front side of the wind frame 51.
[0057]
53 are four rollers provided at the corners of the wind frame 51. Each roller 53 includes roller grooves 22A and 23A of the front pillars 22 and 23, roller grooves 26A of the roof pillars 26 and 27, 27A and the front connecting members 28 and 29 are movably engaged with the roller grooves 28A and 29A.
[0058]
54 denotes a left lock device provided on the left and right sides of the wind frame 51, and 55 denotes a right lock device provided on the right side of the window frame 51. Since 55 has a symmetrical shape on the left and right, the components will be described with the same reference numerals. The left and right locking devices 54 and 55 are roughly constituted by a bracket 56, a hook member 58, a lever member 59, a hook spring 60, and a lever spring 61, which will be described later, as shown in FIGS. .
[0059]
Reference numeral 56 denotes a bracket attached to the upper side of the left frame body 51C (right frame body 51D) of the window frame 51. The bracket 56 is formed as a plate-like body protruding rearward as shown in FIG. The bracket 56 has a front-side fitting recess 56A in which the closing window side engaging pin 48 is fitted, and an upper side fitting recess 56B in which the opening window-side engaging pin 49 is fitted. A locking step 56C which is positioned on the lower side and which is locked by a hook spring 60 which will be described later, and a locking projection 56D which is positioned on the upper side and which is bent inward and which is locked by a lever spring 61 which will be described later. Is provided.
[0060]
Reference numeral 57 denotes a support pin provided in the central portion of the bracket 56 so as to extend leftward and rightward. The support pin 57 is provided so as to protrude outward and inward of the bracket 56.
[0061]
A hook member 58 is rotatably attached to the outside of the bracket 56 via a support pin 57. The hook member 58 has a position corresponding to the front fitting recess 56A of the bracket 56 as shown in FIG. A closed window side hook 58A that is notched and engaged with and disengages from the closed window side engagement pin 48, and is provided at a position shifted by approximately 90 degrees from the closed window side hook 58A. An opening-side hook 58B that engages and disengages from the engaging pin 49 and an abutment protrusion 58C that extends to the opposite side of the closing-window-side hook 58A and abuts against a claw portion 59A of a lever member 59 described later.
[0062]
A lever member 59 is rotatably attached to the outside of the bracket 56 via a support pin 57 so as to overlap the hook member 58, and the tip end side of the lever member 59 extends in the radial direction of the support pin 57. . Further, as shown in FIG. 16, a claw portion 59A that is bent and extends inward in the left and right directions is provided on the base end side of the lever member 59. The claw portion 59A is provided with a contact protrusion 58C of the hook member 58. Is in contact with and engaged.
[0063]
A hook spring 60 is provided on the outer peripheral side of the support pin 57 and is located on the inner side of the bracket 56. One end of the hook spring 60 is locked to the locking step portion 56C of the bracket 56, and the other end side is locked. Locked to the hook member 58. The hook spring 60 biases the hook member 58 (the closed window side hook 58A, the opened window side hook 58B) in a direction in which the hook member 58 is engaged with the engaging pins 48 and 49, that is, in the direction indicated by the arrow A in FIG. .
[0064]
Reference numeral 61 denotes a lever spring provided between the bracket 56 and the lever member 59. The lever spring 61 is locked at one end side by a locking projection 56D of the bracket 56 and at the other end side by a claw portion of the lever member 59. Locked to 59A. The lever spring 61 biases the lever member 59 in the direction indicated by the arrow A.
[0065]
As shown in FIGS. 8 and 11, the lock devices 54 and 55 configured in this way are closed at the front end of the closed window side hook 58 </ b> A of the hook member 58 when the front window 50 is disposed at the closed window position closed at the front side. By contacting the window side engagement pin 48, the window closing side hook 58A rotates in the direction of arrow B in FIG. 13 against the hook spring 60 and automatically engages with the window closing side engagement pin 48. And lock.
[0066]
Further, as shown in FIGS. 9 and 12, when the front window 50 is disposed at the window opening position opened to the roof side, the tip of the window opening side hook 58B of the hook member 58 comes into contact with the window opening side engaging pin 49. The window-side hook 58B rotates in the direction of arrow B against the hook spring 60 and automatically engages and locks the window-side engaging pin 49.
[0067]
On the other hand, when releasing the lock of the window side hook 58 </ b> A with respect to the window side engagement pin 48 and the lock of the window side hook 58 </ b> B with respect to the window side engagement pin 49, the lever member 59 is indicated by the arrow against the lever spring 61. It rotates in the B direction. As a result, the claw portion 59A of the lever member 59 rotates the hook member 58 in the direction indicated by the arrow B via the contact protrusion 58C, so that the closing window side hook 58A is detached from the closing window side engaging pin 48, and the opening side The window-opening side hooks 58B can be detached from the engaging pins 49 to release the locks.
[0068]
Next, 62 is a lock release bar located on the rear surface side of the wind frame 51 and extending left and right. The lock release bar 62 has a left end portion on the left side as shown in FIG. The right end is attached to the distal end side of the lever member 59 provided on the right locking device 55 by welding means or the like. The lock release bar 62 is operated to rotate the window closing side hook 58A and the window opening side hook 58B in conjunction with each other. When the lock release bar 62 is gripped and rotated in the arrow B direction, the lever member 59, The window closing side hook 58A and the window opening side hook 58B are rotated via 59, and the lock by the left and right locking devices 54, 55 can be simultaneously released by one operation.
[0069]
Here, as shown in FIG. 8, the lock release bar 62 is located at a position outside the range of view α that the operator OP can obtain through the windshield 52 with the front window 50 placed in the closed window position. Arrangement, i.e., above the windshield 52. As a result, the lock release bar 62 can give a good field of view to the operator OP at the time of work without obstructing the field of view of the operator OP even when the front window 50 is moved forward and closed. Further, the lock release bar 62 is disposed at a position provided on the roof panel 42 so as not to interfere with the opening and closing of the canopy.
[0070]
Reference numeral 63 denotes a window stopper that is attached to the rear connecting frame 33 so as to protrude forward. The window stopper 63 is located at the opening position when the front window 50 is opened to the roof pillars 26 and 27. Is elastically abutted on the surface.
[0071]
The hydraulic excavator according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
[0072]
First, at a work site or the like, an operator moves the lever for traveling in the cab 11 to move the lower traveling body 1 forward or backward, for example. Then, when performing excavation work or the like of earth and sand, the working device 3 is operated by tilting the working lever, or the upper swing body 2 is swung.
[0073]
Thus, according to the present embodiment, the front window 50 is provided with the lock release bar 62 attached to the lever members 59 and 59 of the left and right locking devices 54 and 55 at the left and right ends. Therefore, when the lock devices 54 and 55 are unlocked in order to open and close the front window 50, both the left and right lock devices 54 and 55 can be operated by rotating the lock release bar 62 once. The lock can be released together. As a result, the operability when opening and closing the front window 50 can be improved.
[0074]
Further, each of the locking devices 54 and 55 can automatically engage with each closing window side engaging pin 48 when the front window 50 is disposed at the closed window position, and the front window 50 is disposed at the opened window position. In some cases, it is possible to automatically engage with each of the window-opening side engaging pins 49, so that the front window 50 can be easily opened and closed in this respect as well.
[0075]
Furthermore, since the lock release bar 62 is disposed at a position that does not obstruct the field of view of the operator OP with the front window 50 disposed at the closed window position, the operator OP can be given a good field of view during work. The operability and safety at the time can be improved.
[0076]
Further, since the lock release bar 62 is disposed at a position that does not hinder the opening and closing of the canopy provided on the roof panel 42, the operability when opening and closing the canopy can be improved.
[0077]
On the other hand, the hook members 58 of the locking devices 54 and 55 are provided with a window closing hook 58A that engages with the window closing engagement pin 48 and a window opening hook 58B that engages with the window opening engaging pin 49. Therefore, it is possible to engage both the closed window side engaging pin 48 and the opened window side engaging pin 49 without making an unreasonable design, and the degree of freedom in designing can be increased.
[0078]
Further, the locking devices 54 and 55 urge the hook members 58 (hooks 58A and 58B) by the hook springs 60 and the lever members 59 by the lever springs 61. When engaging with 49, only the hook member 58 rotates without rotating the lever member 59 (lock release bar 62). Accordingly, the opening / closing operation of the front window 50 can be smoothly performed without giving an impact to the operator OP when locked.
[0079]
In the embodiment, the front pillars 22 and 23 and the roof pillars 26 and 27 are connected via the front connecting members 28 and 29, and the rear pillars 24 and 25 and the roof pillars 26 and 27 are connected via the rear connecting members 30 and 31. However, the present invention is not limited to this. For example, the front pillar and the roof pillar, or the rear pillar and the roof pillar may be directly fixed by welding means or the like.
[0080]
In the embodiment, the case where the hook member 58 and the lever member 59 are provided as separate parts has been described as an example. However, the present invention is not limited thereto, and for example, the hook member and the lever member are integrally formed. It is good also as a structure which forms and attaches a lock release bar to the lever member.
[0081]
Furthermore, in the embodiment, the cab 11 of the hydraulic excavator has been described as an example of the cab for the construction machine. However, the present invention is not limited thereto, and may be applied to another cab for a construction machine such as a hydraulic crane. Can do.
[0082]
【The invention's effect】
  As described above in detail, according to the first aspect of the invention, the front window extends leftward and rightward on the rear side of the window frame, and both ends are attached to the left and right locking devices and are rotated. Because the lock release bar that unlocks the left and right lock devices is provided, the lock release bar is rotated once to unlock each lock device in order to open and close the front window. Just by operating it, both left and right locking devices can be unlocked together. As a result, operability when opening and closing the front window can be improved.
  Further, the left and right locking devices include a closed window side hook that engages and disengages with a closed window side engaging pin provided on the front pillar, and an opened window side that engages and disengages with the opened window side engaging pin provided on the roof pillar. The lock release bar is configured to rotate the window closing side hook and the window opening side hook in conjunction with each other.
  Thereby, when the front window is closed, the closed window side hook can be engaged with the closed window side engaging pin. When the front window is opened to the roof side, the lock can be released by rotating the closing window hook with the lock release bar to release the closing window hook from the closing window engaging pin. Can be lifted and opened. Further, when the front window is opened, the window opening side hook can be engaged with the window opening side engaging pin. When the front window is moved to the front side again, similarly to the case of opening, the window opening side hook is pivoted by the lock release bar to release the window opening side hook from the window opening side engaging pin, thereby releasing the lock. And the front window can be placed in the closed window position.
[0083]
  According to the invention of claim 2,Lock devices are located on the upper side of the wind frame and are provided on both the left and right sides.The unlock bar is located within the field of view that the operator can obtain through the windshield with the windshield in the closed window position.On the upper sidePlaced in a position. ThereforeEven when the front window is closed to the front,Out of the field of viewTherefore, it is possible to give a good field of view to the operator during work and improve workability and safety.
[0085]
  Claim4According to this invention, the left and right locking devices are provided on the bracket provided on the window frame and rotatably on the bracket.TheClosed side hook andOpenA hook member made up of a window side hook, a lever member that is pivotally provided on the bracket and rotates the window closing side hook and the window opening side hook, and the window closing side hook and the window opening side hook are engaged with the engaging pin. The hook spring is biased in the locking direction, and the lever spring is biased in the locking direction, and the lock release bar is attached to the left and right lever members.
[0086]
Thereby, when the front window is closed, the closing window side hook can be engaged with the closing window side engagement pin by the hook spring while rotating against the hook spring. In addition, when opening the front window, by rotating the lever member against the lever spring in the unlocking direction opposite to the locking direction, the closing window side hook can be detached from the closing window side engaging pin, The front window can be moved to the roof side by unlocking the locking device. Furthermore, when the front window is opened to the roof side, the window opening side hook can be engaged with the window opening side engaging pin by the hook spring while rotating against the hook spring. When the front window is moved to the front side again, the window-side hook can be detached from the window-side engagement pin by rotating the lever member in the unlocking direction, as in the case of opening.
[Brief description of the drawings]
FIG. 1 is a front view showing a hydraulic excavator applied to an embodiment of the present invention.
FIG. 2 is an enlarged left side view of the hydraulic excavator with the working device omitted.
FIG. 3 is a plan view of the hydraulic excavator shown in FIG. 2;
4 is an enlarged front view showing the cab in FIG. 1. FIG.
FIG. 5 is a left side view of the cab shown in FIG.
FIG. 6 is an external perspective view showing a cab frame.
FIG. 7 is an exploded perspective view showing a cab frame.
8 is a cross-sectional view of the cab viewed from the direction of arrows VIII-VIII in FIG.
FIG. 9 is a cross-sectional view seen from the same position as FIG. 8 showing the cab with the front window open.
FIG. 10 is an external perspective view showing an enlarged base frame as a single unit.
FIG. 11 is an enlarged cross-sectional view of a main part showing an enlarged state in which the lock device is engaged with the closing window side engaging pin.
FIG. 12 is an enlarged cross-sectional view of a main part showing an enlarged state in which the lock device is engaged with the window-opening side engagement pin.
FIG. 13 is an enlarged perspective view of the main part showing the upper part of the front window.
FIG. 14 is a front view showing a bracket of the locking device alone.
FIG. 15 is a front view showing a single hook member of the locking device.
FIG. 16 is a front view showing a lever member of the lock device alone;
[Explanation of symbols]
11 Cab
13 Base frame
22 Left front pillar
23 Right front pillar
24 Left rear pillar
25 Right rear pillar
26 Left roof pillar
27 Right roof pillar
32 Front connection frame
33 Rear connection frame
48 Closed window side engagement pin
49 Engagement pin on window side
50 Front wind
51 wind frame
52 Windshield
54,55 Locking device
58 Hook member
58A Closed window side hook
58B Opening side hook
59 Lever member
60 Hook spring
61 Spring for lever
62 Unlock bar
OP operator

Claims (4)

A base frame composed of a frame-like body, left and right front pillars located at the left and right corners located on the front side of the base frame, and left and right front pillars located on the rear side of the base frame The left and right rear pillars arranged at the corner, the left and right roof pillars connecting the upper part of the front pillar and rear pillar in the front and rear directions, and the upper side of the left and right front pillars are connected in the left and right directions. A front connecting frame, a rear connecting frame for connecting the upper sides of the left and right rear pillars in the left and right directions, and a front window that can be opened and closed between the left and right front pillars and the roof pillar. In the cab for construction machinery,
The front window is provided with a windshield and is movable between the front pillar and the roof pillar, and is provided on both left and right sides of the wind frame, and the front window is disposed between the front pillars. A locking device that locks at the closed window position and an open window position that is disposed between the roof pillars, and the rear side of the window frame extends left and right, and both ends are attached to the left and right locking devices. And a lock release bar that unlocks the left and right locking devices by being operated , and the left and right locking devices are engaged with a closing window side engaging pin provided on the front pillar. A window-side hook to be detached, and a window-side hook to be engaged with and detached from the window-side engagement pin provided on the roof pillar. Unlocking bar construction equipment cab, characterized in that a configuration in which the rotating operation in conjunction with the閉窓side hooks and open window side hook. The lock device is provided on both the left and right sides of the wind frame above the window frame, and the lock release bar is provided by an operator through the windshield with the windshield disposed at the closed window position. The cab for construction machines according to claim 1, wherein the cab is disposed at a position deviating upward from a range of visibility that can be obtained. The cab for a construction machine according to claim 1 or 2 , wherein the closed window side hook and the opened window side hook are formed integrally with one hook member. The left and right of the locking device comprises a bracket provided on the window frame, and a hook member consisting of the閉窓side hook Oyo BiHiraku window side hook provided rotatably on the bracket, pivoted in the bracket A lever member which is provided so as to rotate the window closing side hook and the window opening side hook, the hook spring which urges the window closing side hook and the window opening side hook in the locking direction to engage the engaging pin, and the lever. The construction machine cab according to claim 1 or 2, wherein the member is constituted by a lever spring that urges the member in a locking direction, and the lock release bar is attached to the left and right lever members.

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