JP3640517B2 - Manual opening and closing front window device for cab for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a manually openable front window device for a cab mounted on a construction machine such as a hydraulic excavator or a work vehicle.
[0002]
[Prior art]
FIG. 15 is a side view of the main part showing the inside of the cab 1 of a hydraulic excavator (not shown). The front window 2 is turned up from the front surface of the cab 1 to the inner surface side of the cab ceiling 3 to rotate the front window. It is a figure which shows the state stored in (the front surface of the cab 1 is open | released). In the drawing, 4L and 4R are parallel left and right roller guide rails (hereinafter referred to as guide rails) disposed on the inner wall surface of the cab 1. In FIG. 15, the left guide rail 4L is not shown because it is on the near side. ) 5L and 5R are rollers respectively attached to the left and right ends of the upper part of the front window 2 (indicated by reference symbol A) (the roller 5R is attached to the opposite side of the roller 5L and cannot be seen in the figure), 6L, 6R is a roller attached to each of the left and right ends of the lower portion of the front window 2 (indicated by reference symbol A ') (the roller 6R is attached to the opposite side of the roller 6L, so it cannot be seen in the figure), and 7 is the front window 2 A handle 8 is used to open and close the door. A latch lever 8 is used to lock the front window 2 in the window open position. is there. FIG. 16 is a cross-sectional view of the main part viewed from AA in FIG. In the figure, 9 is a windshield of the front window 2, 10L and 10R are latch fittings fixedly attached to the window frame 11 of the front window 2, and 12 and 12 are rollers 6L and 6R provided on the latch fittings 10L and 10R, respectively. Latch pins 14 and 14 are inserted through the shaft center holes 13 and 13, and 14 and 14 are locking holes which are opened in the side plates (not denoted by reference numerals) of the guide rails 4L and 4R. . In FIG. 16, the latch fitting 10L (the right latch fitting in the drawing) shows a locked state, and the left latch fitting 10R in the drawing shows a state before the locking operation.
[0003]
In the front window device of one embodiment of the prior art shown in FIGS. 15 and 16, parallel guide rails 4 </ b> L and 4 </ b> R extending from the front side to the inner surface of the ceiling 3 are arranged on the left and right inner wall surfaces of the cab 1. Rotating rollers 5L, 5R, 6L, and 6R are attached to the left and right of the upper and lower portions, respectively. Therefore, when opening the front window 2 in the window closing position on the front surface of the cab 1, the front window 2 is lifted by grasping the handle 7, and the rollers (reference numerals are omitted) are rolled along the guide rails 4L and 4R. Thus, the window is moved to the window opening position on the inner surface side of the cab ceiling 3 (the position of the front window 2 shown in FIG. 15). Then, by operating the latch lever 8 shown in FIG. 16 and fitting the latch pin 12 into the locking holes 14 of the guide rails 4L and 4R, the front window 2 can be locked and fixed at the window opening position.
[0004]
Although not shown in the drawings, in the conventional cable-driven power window, the front window is pressed against the seal member mounted around the front window opening of the cab by driving the lock motor (lock motor). The vertical movement of the front window is stopped by the tension of the cable for driving the front window.
[0005]
[Problems to be solved by the invention]
In the front window device according to an embodiment of the prior art, when the front window 2 is locked and fixed to the window opening position on the inner surface side of the cab ceiling 3, the latch pins 12 of the latch fittings 10L and 10R are respectively connected to the guide rails 4L and 4R. Each lock hole 14 must be fitted. However, when performing the fitting operation, it is difficult to visually check whether or not the axial center of the latch pin 12 and the hole center of the locking hole 14 coincide with each other. 14 and the latch pin 12 are loose, and the sealing performance between the cab 1 and the front window 2 is not sufficient. Further, when it is assumed that the pressing type locking device used in the conventional power window device is simply applied to the manual opening / closing type front window, there is no cable in the manual type front window. The front window may be shifted upward due to vibration or impact during operation of the construction machine only by pressing against the member, and the front window cannot be reliably fixed. According to the present invention, the front window can be locked or unlocked by operating the handle portion. When the front window is locked, the front window is pressed against the seal member on the inner surface of the cab and is separately fixed. An object of the present invention is to provide a manual front window device that can be sufficiently fixed by being pressed against a stopper.
[0006]
[Means for Solving the Problems]
According to the present invention, in a construction machine in which the front window is movable between the closed position of the front surface of the cab and the open position of the inner surface of the cab ceiling, the bracket fixed to the front window and the pivot set on the bracket are used. A lever member pivotally supported by the support shaft in the front-rear direction, a handle portion formed on the lever member, and a first position set in the same direction as the pivot shaft of the lever member and in an eccentric position A link shaft, a first link member with one end pivotally attached to the first link shaft, a roller shaft set at the other end of the first link member, and a roller shaft A second link member having one end rotatably attached in the front-rear direction, a second link shaft pivotally supported by the second link member in the front-rear direction, and fixed to the front window; Said A roller pivotally supported on the roller shaft, the roller is guided to the roller shaft, and a roller guide rail disposed parallel to the left and right sides of the front surface of the cab, and fixed to the inner surface of the cab. A stopper for restricting the vertical movement of the front window is provided, and the front window is pushed outward from the cab by operation of the handle portion and fixed to the stopper by pressing. Therefore, when the handle portion is rotated upward about the pivot shaft when the front window is locked and fixed, the roller is set in the eccentric position while being fitted to the roller guide rail. Since the position of the first link shaft that has been moved moves to a position on the near side of the pivot shaft, the front window is pushed outward from the cab and pressed against the stopper and the seal member (described later). it can. In other words, the lock fixing operation can be easily performed and the vertical movement of the front window can be reliably regulated without performing delicate positioning as in the latch-type lock device of the prior art. .
[0007]
The stopper has a front stopper fixed to the inner side surface of the upper front surface of the cab, and when the front window is in the closed position, the upper end of the front window is moved to the front by operating the handle portion. The stopper can be fixed by being pressed against the stopper, and the stopper has elasticity, and has a front window vertical movement restricting surface that comes into contact with a front corner of the upper end of the front window. That is, the stopper has a front stopper, and the front stopper is formed with a regulating surface that regulates the vertical movement of the front window. This restricting surface is a slope that intersects the movement trajectory of the cab front window upper end front corner when pressed, and at the same time the front window is pressed against a seal member described later, the front window upper end front corner Is pressed, it is possible to restrict the movement of the front window in the vertical direction.
[0008]
According to the present invention, in the cab for a construction machine in which the wiper is attached to the front window, the stopper has a rear stopper fixed to the inner side surface near the rear of the ceiling of the cab, and the front window is in the open position. The upper end of the front window can be pressed and fixed against the rear stopper by operating the handle portion, and the rear stopper further includes a switch member protruding to a contact portion with the front window. When the front window is pressed against and fixed to the rear stopper, the switch member is pushed by the front window, and the operation of the wiper and / or window washer is stopped by pushing the switch member. In other words, compared to a cab with a wiper attached directly to the front window, when the front window is stored on the ceiling inner surface side of the cab, if the front window is operated in this stored state, the structure in the cab and others The wiper or the structure may be damaged due to interference, but in the case of the present invention, the limit switch is built in the rear stopper and the pressing part protrudes, so the wiper when the front window is stored in the cab ceiling part Can be configured. It is possible to operate this limit switch when the front window is closed, but in this case, the limit switch is installed at the upper position of the front of the cab or the lower position of the front window, which may obstruct the driver's view. Location or placement method is difficult. In this regard, in the present invention, a switch member is internally mounted (or mounted close to the interior) of the rear stopper fixed in the vicinity of the cab rear ceiling, which does not block the view and has a relatively large space in the room. Yes. According to this, even if the rear stopper is enlarged for this purpose, it is advantageous because it does not adversely affect visibility, indoor space, and the like.
[0009]
The switch member is integrally covered with a flexible resin material integrally with the contact portion of the rear stopper. Therefore, even when the front window wet with rain or the like is stored, it is possible to prevent the limit switch having the switch member from being damaged due to the intrusion of rainwater.
[0010]
A spring member is attached over the lever member and the first link member, and the spring member biases the handle portion toward an operation position where the front window is pressed and fixed when the front window is pressed and fixed. When the front window is unlocked, the handle portion is urged toward an operation position where the front window is unlocked. That is, since the spring member is attached over the first link and the lever member, the lever member (handle portion) can be prevented from rattling and the pressing and fixing state can be held by the spring force, so that the inadvertent release of the locked state can be performed. Can be prevented. In addition, since the amount of operation of a certain handle is biased toward the unlocked state, it is possible to prevent inadvertent locking in the unlocked state and to stop the front window from moving unexpectedly when the front window is opened. Can be prevented.
[0011]
Further, the handle portion is brought close to the inner wall of the cab when the front window is pressed and fixed. Therefore, when the front window is locked, the handle portion is in a state of being close to the inner wall of the cab, so that the occupation of the indoor space by the handle portion during the operation of the construction machine can be minimized, and the The handle portion can be prevented from blocking the view.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of an essential part showing a cab 15 provided with a front window device according to an embodiment of the present invention. In the figure, 16L and 16R are parallel left and right roller guide rails (hereinafter referred to as guide rails, not shown because the right guide rail 16R is on the front side), 17 provided on the inner wall surface of the cab 15. Is a front window in a locked state at the window closing position on the front surface of the cab 15, 18 is a windshield of the front window 17, and 19 L and 19 R are rollers (rollers) attached to both left and right ends of the lower portion of the front window 17. 19L is not shown in the figure because it is mounted on the side opposite to the roller 19R, and upper rollers 20L and 20R are also mounted, but the reference numerals thereof will not be described in FIG. A lever member for operating lock fixing / unlocking of the front window 17, 22 is a front window. When the door 17 is in the window opening position on the inner surface side of the cab ceiling 23, a rear stopper that abuts the upper end of the front window 17, 24 is a wiper for wiping the windshield 18, and 25 is a wiper motor for driving the wiper 24. .
[0013]
FIG. 2 is an enlarged detail view of a portion B in FIG. In the front window device of the present embodiment, the link (31) structure having the lever member 21 is provided symmetrically on both the left and right ends of the upper portion of the front window 17, so the right link 31 structure will be described as a representative. 20R (shown in phantom) is a roller provided on the right end side of the upper portion of the front window 17 and fitted to a right guide rail 16R (not shown) (the upper roller 20L on the left end side is on the side opposite the roller 20R). 26 is a synthetic resin material such as a rubber material attached to bring the front corner of the upper end of the front window 17 into contact when the front window 17 is in the window closing position on the front surface of the cab 15. The front stopper 29 is a bracket fixed to the upper inner surface of the front window 17, 21a is a handle portion formed on the lever member 21, 30 is a pivot shaft set on the bracket 29, and 34 is pivotally supported. A first link shaft set in the same direction as the shaft 30 and in an eccentric position, 32 is a roller shaft pivotally supporting the roller 20R, and 36 is a second link. The first link member 33, 35 the second link member 37 is a spring. Reference symbol C denotes a lock operation position of the handle portion 21a to which the front window 17 is pressed and fixed, reference symbol B shown by an imaginary line denotes a lock release operation position to release the front window 17 and angle θ denotes a lock operation position of the handle portion 21a. This is the angle formed by the first link member 33 and the second link member 35 when operated in the c. Reference numeral 43 is provided on the inner surface side of the cab 15, and when the front window 17 is in the window closed position (when the front window 17 is locked), the contact surface between the cab 15 and the front window 17 is watertight. It is the sealing member to hold | maintain. FIG. 3 is a side view of the main part showing a state in which the front window 17 in FIG. 2 is unlocked. As shown in FIG. 3, when the handle portion 21a is operated to the unlocking operation position B, the angle formed by the first link member 33 and the second link member 35 changes to an angle θ ′.
[0014]
FIG. 4 is a front view of a main part viewed from C in FIG. In the figure, 38 is a spring hook pin fixed to one end portion of the lever member 21 to lock one end of the spring 37, and 39 is fixed to one end portion of the first link member 33 and engages the other end of the spring 37. It is a spring hook pin that stops. FIG. 5 is a plan view of the main part as viewed from D of FIG. FIG. 6 is a cross-sectional view of the main part viewed from EE in FIG. FIG. 7 is an enlarged view of the F part in FIG. 1, and shows a state where the front window 17 is moved to the window opening position on the inner surface side of the cab ceiling 23. In the figure, reference numeral 40 denotes a structural member (for example, a rear header panel) on the inner surface side of the cab 15.
[0015]
FIG. 8 is a cross-sectional view of the main part showing the rear stopper 22 of the first embodiment in FIG. In the figure, 22 is a rear stopper formed of a synthetic resin material having elasticity, such as a rubber material, in a cylindrical shape, 42 is a stopper support body of the rear stopper 22, and 44 and 45 are stopper support bodies 42 as structural members 40 of the cab 15. The nuts 46 are tightened and fixed, 46 is a limit switch provided in the rear stopper 22, and 47 is a pressing portion protruding from the limit switch 46. FIG. 9 is a view as seen from G of FIG. In the figure, reference numeral 48 denotes a harness connected to the limit switch 46. The limit switch 46 is set in the present embodiment so that the electric circuit of the harness 48 is opened when the pressing portion 47 is pressed and retracted. FIG. 10 is a perspective view of a main part of the cab 15 shown in FIG. In the figure, 50 is a window washer which is one of the cleaning maintenance devices for the windshield 18, and 51 is a washer motor for driving the window washer 50. FIG. 11 is an electric circuit diagram to which the limit switch 46 in FIG. 8 is connected. In the figure, 52 is a wiper operation switch, 53 is a window washer operation switch, and 54 is a power source.
[0016]
Next, the configuration and operation of the front window device according to the embodiment of the present invention will be described with reference to FIGS. In this embodiment, the front window 17 is fixed to the front window 17 in a construction machine (such as a hydraulic excavator) in which the front window 17 is movable between a closed position on the front surface of the cab 15 and an open position on the inner surface of the cab ceiling 23. A bracket 29; a lever member 21 pivotally supported by a pivot shaft 30 set on the bracket 29 so as to be rotatable in the front-rear direction; a handle portion 21a formed on the lever member 21; A first link shaft 34 set in the same direction as the pivot shaft 30 and in an eccentric position; a first link member 33 having one end rotatably attached to the first link shaft 34 in the front-rear direction; A roller shaft 32 set at the other end of the first link member 33; a second link member 35 having one end rotatably attached to the roller shaft 32 in the front-rear direction; and the second link member. And a second link shaft 36 fixed to the front window 17, a roller 20R pivotally supported on the roller shaft 32, and the roller. A front portion that guides 20R and restricts the vertical movement of the guide window 16R disposed in parallel to the left and right sides of the front surface of the cab 15 and the front window 17 fixed to the inner surface of the cab 15 A stopper 26 is provided. Accordingly, when the handle portion 21a is turned upwardly as shown in FIG. 2 when the operation for locking and fixing the front window 17 is performed as shown in FIG. 2, the roller 20R is fitted to the guide rail 16R. In this state, the position of the first link shaft 34 set at the eccentric position moves to the position on the near side of the pivot shaft 30, so that the front window 17 is pushed out of the cab and the front stopper 26 is pushed out. And can be pressed against and fixed to the seal member 43. That is, the lock fixing operation can be easily performed without performing the delicate positioning as in the conventional latch-type lock device (shown in FIG. 16), and the front window 17 can be moved in the vertical direction. It can be regulated reliably. Further, the unlocking of the locked front window 17 can be easily performed by rotating the handle portion 21a downward as shown in FIG.
[0017]
Further, the front stopper 26 fixed to the inner side surface of the front upper portion of the cab 15 has elasticity (the material is a synthetic resin material such as a rubber material), and at the front corner of the upper end of the front window 17. A front window vertical movement restricting surface (a surface indicated by a symbol S in FIG. 2) is in contact. That is, the front window vertical movement restriction surface S is formed with a restriction surface for restricting the vertical movement of the front window 17. The front window vertical movement restricting surface S is a slope with respect to a movement locus when the front corner of the front window 17 of the cab 15 is pressed, and at the same time the front window 17 is pressed against the seal member 43. By pressing the front upper corner portion of the front window 17 against the front, the movement of the front window 17 in the vertical direction can be restricted.
[0018]
In the present embodiment, a spring 37 (a helical spring member) is attached across the lever member 21 and the first link member 33, and the spring 37 is fixed to the handle portion 21a when the front window 17 is pressed and fixed. Is urged toward the operation position C where the front window 17 is pressed and fixed, and when the front window 17 is unlocked, the handle portion 21a is applied toward the operation position B where the front window 17 is released. I tried to force it. Accordingly, rattling of the lever member 21 (handle portion 21a) can be prevented, and the pressing and fixing state can be held by the spring force of the spring 37, so that the inadvertent release of the locked state can be prevented. Further, since the amount of operation of a certain handle portion 21a is urged toward the unlocked state, it is possible to prevent inadvertent locking in the unlocked state, and inadvertent front window 17 when the front window 17 is opened. Can be prevented from stopping.
[0019]
Further, the handle portion 21a is brought close to the inner wall of the cab 15 when the front window 17 is pressed and fixed. Therefore, when the front window 17 is in the locked state, the handle portion 21a is close to the inner wall of the cab 15, so that the occupation of the interior space of the cab 15 by the handle portion 21a when working the construction machine is minimized. In addition, the handle portion 21a can be prevented from blocking the field of view.
[0020]
In this embodiment, the wiper 24 is attached to the cab 15, and has a rear stopper 22 fixed to the inner side surface near the rear of the cab ceiling 23, and the front window 17 is in the open position. By operating the handle portion 21a, the upper end (upper one end portion) of the windshield 18 of the front window 17 can be pressed and fixed against the rear stopper 22, and the rear stopper 22 is in contact with the front window 17. A switch member (referred to as a limit switch 46) protruding at the contact portion, and when the front window 17 is pressed against the rear stopper 22, the switch member is pushed by the front window 17, and the switch The wiper 24 and / or the window washer 5 can be operated by pushing the member. The actuation and be stopped. That is, for example, compared to a cab (not shown) in which a wiper is directly attached to the front window, when the front window is stored on the inner surface of the cab ceiling, the front window operates in this stored state. There is a possibility that the wiper or the structure may be damaged by interfering with the structure or the like in the cab, but in the case of this embodiment, the limit switch 46 is built in the rear stopper 22 and the pressing part 47 is protruded. The interlock of the wiper 24 when 17 is stored inside the cab ceiling 23 can be configured. Although it is conceivable to operate the limit switch 46 when the front window is closed, in this case, the limit switch is disposed at the upper front position of the cab 15 or the lower end position of the front window 17 which may obstruct the driver's view. It is difficult to arrange or arrange. In this respect, in this embodiment, the limit switch 46 is mounted (closely attached) to the rear stopper 22 fixed in the vicinity of the ceiling behind the cab 15 without obstructing the field of view and having a relatively large space in the cab 15. Including the case). According to this, even if the rear stopper 22 is enlarged for this purpose, it is advantageous because it does not adversely affect visibility, indoor space, and the like.
[0021]
Next, FIG. 12 is a main part showing a second example rear stopper 22'a (note that the first example rear stopper is the aforementioned rear stopper 22 shown in FIG. 8) in the front window device of the present embodiment. FIG. In the figure, the same reference numerals are assigned to the same components as those of the rear stopper 22 of the first embodiment. In the rear stopper 22′a shown in FIG. 12, the stopper support main body 42′a is formed of a rough mold material, and the limit switch 46 is incorporated in the frame portion 55 of the stopper support main body 42′a.
[0022]
FIG. 13 is a side view of the main part showing the rear stopper 22′b of the third embodiment. In the figure, the same reference numerals are assigned to the same components as those of the rear stopper 22 of the first embodiment. In the structure of the rear stopper 22′b shown in FIG. 13, a board metal fitting 57 is provided on the stopper support body 42′b for fixing the rear stopper 22′b, and a limit switch 46 ′ is attached to the end of the board metal fitting 57. .
[0023]
Next, FIG. 14 shows the essentials of the rear stopper 22′c showing a modification of the rear stopper 22′a of the second embodiment (including the cases of the rear stopper 22 of the first embodiment and the rear stopper 22′b of the third embodiment). FIG. In the figure, the same components as those in the second embodiment rear stopper 22'a are denoted by the same reference numerals. The rear stopper 22′c shown in FIG. 14 is formed so that the main body of the rear stopper 22′c and the pressing portion 47 of the limit switch 46 are integrally covered with a rubber film 56 such as a synthetic resin material having flexibility. did. Therefore, even when the front window 17 wet with rain or the like is stored, it is possible to prevent the limit switch 46 from being damaged due to intrusion of rainwater.
[0024]
【The invention's effect】
In the front window device of the present invention, when the front window is locked and fixed at the closed position of the front surface of the cab or the open position of the inner surface of the cab ceiling, when the handle portion is turned upward, the front window roller Since the position of the first link shaft set at the eccentric position moves while being fitted to the roller guide rail of the cab, the front window is pushed outward to the front stopper and the seal member. Can be pressed and fixed. That is, the lock fixing operation can be easily performed without performing delicate positioning as in the conventional latch-type locking device, and the vertical movement of the front window can be reliably regulated. In addition, when the front stopper has a front window vertical movement restriction surface, the front window vertical movement restriction surface is a slope that intersects the movement locus when the front corner of the front upper end of the cab is pressed. Is pressed against the sealing member with the lower end of the front window as a fulcrum, and at the same time, the front side corner of the front upper end of the front window is smoothly pressed against the slope, so that it can be pressed and fixed without causing backlash, The movement of the window can be regulated reliably. In the above case, a spring member is attached across the lever member integral with the handle portion and the first link member. Accordingly, rattling of the lever member (handle portion) can be prevented, and the pressing and fixing state can be held by the spring force of the spring member, so that the inadvertent release of the locked state can be prevented. In addition, since the amount of operation of a certain handle is biased toward the unlocked state, it is possible to prevent inadvertent locking in the unlocked state and to stop the front window from moving unexpectedly when the front window is opened. Can be prevented. In addition, when the front window is locked, the handle portion is in a state of being close to the inner wall of the cab, so that the occupation of the indoor space by the handle portion when working the construction machine can be minimized, and the The handle portion can be prevented from blocking the view. Further, in the present invention, since the limit switch is provided on the rear stopper fixed to the inner side surface near the ceiling rear of the cab and the pressing portion is protruded, the wiper of the wiper when the front window is stored in the cab ceiling portion is provided. An interlock can be configured. Although it is conceivable to operate this limit switch when the front window is closed, in this case, the upper position of the front of the cab, which may block the driver's field of view, or the location or method of arranging the front window is difficult. In this regard, in the present invention, a switch is installed inside the rear stopper (including the case where it is mounted close to the interior), which is fixed in the vicinity of the ceiling behind the cab without obstructing the field of view and having a relatively large space in the room. ing. According to this, even if the rear stopper is enlarged for this purpose, it is advantageous because it does not adversely affect visibility, indoor space, and the like. Further, since the switch member is covered with a flexible resin material integrally with the abutting portion of the rear stopper, the switch member has a switch member even when the front window wet with rain or the like is stored. It is possible to prevent the limit switch from being broken due to rainwater intrusion.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part showing a cab provided with a front window device according to an embodiment of the present invention.
FIG. 2 is an enlarged detail view of a portion B in FIG.
FIG. 3 is a side view of the main part showing a state in which the front window in FIG. 2 is unlocked;
4 is a front view of the main part as viewed from C in FIG. 3;
FIG. 5 is a plan view of a principal part viewed from D in FIG. 3;
6 is a cross-sectional view of the main part viewed from EE in FIG. 3. FIG.
FIG. 7 is an enlarged view of a portion F in FIG. 1 and shows a state in which the front window is moved to a window opening position on the inner surface side of the cab ceiling.
8 is a vertical sectional view of the main part showing the rear stopper of the first embodiment in FIG. 7; FIG.
9 is a view as seen from G in FIG. 8;
FIG. 10 is a perspective view of a main part of the cab in FIG. 1 as viewed from obliquely upward on the front side.
FIG. 11 is an electric circuit diagram to which the limit switch in FIG. 8 is connected.
FIG. 12 is a cross-sectional view of a principal part showing a second example rear stopper in the present embodiment;
FIG. 13 is a sectional view of a main portion showing a rear stopper of a third embodiment.
FIG. 14 is a sectional view of a main part of a rear stopper showing a modification of the rear stopper of the second embodiment.
FIG. 15 is a side view of an essential part showing the inside of a cab according to an embodiment of the prior art.
16 is a cross-sectional view of the main part viewed from AA in FIG. 15;
[Explanation of symbols]
1,15 cab
2,17 Front wind
4L, 4R, 16L, 16R Roller guide rail
21 Lever member
21a Handle part
22, 22'a, 22'b, 22'c Rear stopper
24 Wiper
26 Front stopper
32 Roller shaft
33 First link member
34 First link shaft
35 Second link member
36 Second link shaft
37 Spring
43 Sealing member
46,46 'limit switch
47 Pressing part
50 window washer

Claims (4)

In a construction machine in which the front window is movable between a closed position on the front surface of the cab and an open position on the inner surface of the cab ceiling,
A bracket fixed to the front window;
A lever member pivotally supported in a longitudinal direction on a pivot shaft set in the bracket;
A handle portion formed on the lever member;
A first link shaft set in the same direction as the pivot shaft of the lever member and in an eccentric position;
A first link member having one end rotatably attached to the first link shaft in the front-rear direction;
A roller shaft set at the other end of the first link member;
A second link member having one end rotatably attached to the roller shaft in the front-rear direction;
A second link shaft that pivotally supports the second link member in the front-rear direction and is fixed to the front window;
A roller pivotally supported on the roller shaft;
A roller guide rail arranged to be parallel to the left and right sides of the front side of the cab, while guiding the rollers;
A stopper that regulates the vertical movement of the front window fixed to the cab inner surface side;
The stopper has a front stopper fixed to the inner side surface of the upper front portion of the cab, and a rear stopper fixed to the inner side surface near the ceiling rear of the cab,
When the front window is in the closed position, the upper end of the front window is pushed outward from the cab by operating the handle portion, and can be fixed by being pressed against the front stopper.
The front stopper has elasticity, and as a front window vertical movement restricting surface that abuts a front corner of the upper end of the front window, a slope is formed with respect to a movement locus when the front corner of the front window upper end is pressed. A manual opening and closing type front window device for a cab for construction machinery.   The rear stopper can be fixed by pressing the upper end of the front window against the rear stopper by operating the handle when the front window is in the open position, and the rear stopper is connected to the front window. A switch member projecting at the abutting portion of the switch, and when the front window is pressed and fixed against the rear stopper, the switch member is pushed by the front window. Alternatively, the operation of the window washer is stopped, and the switch member is covered with a flexible resin material integrally with the contact portion of the rear stopper. Open / close type front window device for cab for construction machinery. In a construction machine in which the front window is movable between a closed position on the front surface of the cab and an open position on the inner surface of the cab ceiling,
A bracket fixed to the front window;
A lever member pivotally supported in a longitudinal direction on a pivot shaft set in the bracket;
A handle portion formed on the lever member;
A first link shaft set in the same direction as the pivot shaft of the lever member and in an eccentric position;
A first link member having one end rotatably attached to the first link shaft in the front-rear direction;
A roller shaft set at the other end of the first link member;
A second link member having one end rotatably attached to the roller shaft in the front-rear direction;
A second link shaft that pivotally supports the second link member in the front-rear direction and is fixed to the front window;
A roller pivotally supported on the roller shaft;
A roller guide rail arranged to be parallel to the left and right sides of the front side of the cab, while guiding the rollers;
A stopper for restricting the vertical movement of the front window fixed to the cab inner surface side;
A spring member attached over the lever member and the first link member;
The front window is pushed outward from the cab by the operation of the handle portion, and is fixed to the stopper by pressing,
The spring member urges the handle portion toward an operation position where the front window is pressed and fixed when the front window is pressed and fixed.
A manual opening and closing type front window device for a cab for construction machinery, wherein when the front window is unlocked, the handle portion is urged toward an operation position where the front window is unlocked.   4. The front opening / closing type front window device for a cab for construction machinery according to claim 1, wherein the handle portion is brought close to an inner wall of the cab at the time of pressing and fixing the front window. 5. .

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