JPH11181833A - Manually openable front window device for cab of construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily fix a front window and securely regulate the vertical movement without a subtle positioning by pushing out the front window to the outside of a cab by a rotary manipulation of a handle to press it on a stopper and a seal member and fix it. SOLUTION: A front window 17 is made transferable between the closed position at the front face of a cab 15 and the closed position at the ceiling inside face of the cab. A lever member 21 is pivoted rotatably in the forward and reaward direction to a pivotal axis 30 provided in a bracket 29 of the front window 17. When the handle 21a of the lever member 21 is rotated upward around the pivotal axis 30 to lock the front window 17, the position of the link axis 34 set at an eccentric position is shifted to this side of the pivotal axis 30 in the state a roller 20R is fitted in a guide rail 16R and the front window 17 is pushed out to the outside of the cab and pressed on a stopper 26 and a seal member 43 and fixed thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manually opened / closed front window device for a cab mounted on a construction machine such as a hydraulic shovel or a working vehicle.

[0002]

2. Description of the Related Art FIG. 15 is a side view showing the inside of a cab 1 of a hydraulic shovel (not shown). The front window 2 is flipped up from the front of the cab 1 to the inside of the cab ceiling 3 and rotated. It is a figure showing the state stored in the front window opening position (the front of cab 1 is opened). In the figure, 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. Note that the left guide rail 4L is not shown in FIG. ), 5L, 5
R is a roller (roller 5R) attached to each of the right and left ends of the upper portion (indicated by the symbol a) of the front window 2.
Are mounted on the opposite side of the roller 5L and cannot be seen in the drawing. 6L and 6R are rollers mounted on the left and right ends of the lower portion of the front window 2 (indicated by reference numeral ′) (the roller 6R is a roller 6L). 7 is a handle to be gripped when opening and closing the front window 2, and 8 is a latch lever that is operated to lock and lock the front window 2 to the window open position. is there. FIG.
It is principal part sectional drawing seen from -A. In the figure, reference numeral 9 denotes a windshield of the front window 2, 10L and 10R denote latch fittings fixedly attached to the window frame 11 of the front window 2, and 12 and 12 denote latch fittings 10L and 10R.
, The respective shaft holes 13 of the rollers 6L, 6R,
Latch pins 14 and 14 inserted through
Are locking holes formed in the side plates (not denoted by reference numerals) of the guide rails 4L and 4R. FIG. 1
The latch fitting 10L (the right latch fitting in the figure) in FIG. 6 shows the locked state, and the left latch fitting 10R in the figure shows the state before the lock operation.

In a front window apparatus according to one embodiment of the prior art shown in FIGS. 15 and 16, parallel guide rails 4L, 4R extending from the front side to the inner side of the ceiling 3 are arranged on the left and right inner wall surfaces of the cab 1, respectively. Rollers 5L, 5R, 6 rotatable left and right on the upper and lower portions of the front window 2, respectively.
L, 6R are attached. Therefore, when opening the front window 2 at 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 (not shown) are rolled along the guide rails 4L, 4R. Then, the cab ceiling 3 is moved to the window opening position on the inner surface side (the position of the front window 2 shown in FIG. 15). Then, the latch pin 8 is operated by operating the latch lever 8 shown in FIG.
The front window 2 can be locked and fixed at the window opening position by fitting into the respective locking holes 14.

In a cable-driven power window, which is not shown in the drawings, a lock motor is driven to fix a front window against a seal member mounted around a front window opening of a cab. (By the operation of the press-type locking device having a lock motor), and the vertical movement of the front window is stopped by tensioning a cable for driving the front window.

[0005]

In the front window apparatus according to the prior art, when the front window 2 is locked at the window opening position on the inner surface side of the cab ceiling 3, the latch pins 10L and 10R are provided with respective latch pins. 12 must be fitted into the locking holes 14 of the guide rails 4L, 4R. However, when the fitting operation is performed, it cannot be visually confirmed whether or not the axis of the latch pin 12 is aligned with the hole of the locking hole 14, so that the positioning is difficult, and There is play between the cab 14 and the latch pin 12, and the sealing between the cab 1 and the front window 2 is not sufficient. Further, when it is assumed that the press-type lock device used in the power window device conventionally implemented is simply applied to the manual opening / closing front window, the cable is not present in the manual front window. Simply pressing against the member may cause the front window to shift upward due to vibration or impact during operation of the construction machine, and the front window cannot be securely fixed. According to the present invention, the front window can be locked or unlocked by operating the handle portion, and 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]

SUMMARY OF THE INVENTION According to the present invention, a bracket fixed to a front window is provided for a construction machine in which a front window is movable between a closed position on a front surface of a cab and an open position on an inner surface of a cab ceiling. A lever member pivotally supported on a pivot shaft set on the bracket so as to be rotatable in the front-rear direction; a handle formed on the lever member; and a lever member in the same direction as the pivot shaft of the lever member. A first link shaft set at an eccentric position, a first link member having one end attached to the first link shaft rotatably in the front-rear direction, and a second link shaft set at the other end of the first link member. A roller shaft, a second link member having one end attached to the roller shaft so as to be rotatable in the front-rear direction, and pivotally supporting the second link member so as to be rotatable in the front-rear direction. Solid A second link shaft, a roller rotatably supported by the roller shaft, a roller guide rail that guides the roller, and is disposed in the vicinity of both sides of the front surface of the cab in parallel to the left and right. There is a stopper fixed to the inner surface of the cab for restricting the vertical movement of the front window, and the front window is pushed out of the cab by operating the handle portion, and is pressed and fixed to the stopper. Therefore, when the handle portion is turned upward around the pivot shaft when the operation of locking and fixing the front window is performed, the roller is set to the eccentric position in a state of being fitted to the roller guide rail. The position of the first link shaft is moved to a position on the front side of the pivot shaft, so that the front window is pushed out of the cab and pressed and fixed against the stopper and a seal member (described later). it can. That is, it is possible to easily perform the lock fixing operation without performing delicate positioning as in the case of the conventional latch type lock device, and it is possible to reliably restrict the vertical movement of the front window. .

[0007] The stopper has a front stopper fixed to the inner surface of the front upper portion of the cab. When the front window is in the closed position, the upper end of the front window is operated by operating the handle. The stopper can be pressed and fixed to the front stopper, and the stopper has elasticity and has a front window vertical movement regulating surface that abuts on a front corner of the upper end of the front window. That is, the stopper has a front stopper, and the front stopper has a regulating surface for regulating the vertical movement of the front window. The restricting surface is a slope intersecting the movement locus of the upper front corner of the front window of the cab at the time of pressing, and the front window is pressed against a sealing member described later, and at the same time, the front window upper front corner is pressed against this slope. By pressing, the movement of the front window in the vertical direction can be restricted.

According to the present invention, in a cab for a construction machine in which a wiper is attached to a front window, the stopper has a rear stopper fixed to an inner surface near the ceiling rear of the cab. When 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 is further provided with a switch member protruding from a contact portion with the front window. When the front window is pressed against and fixed to the rear stopper, a switch member is pressed by the front window, and the operation of the wiper and / or the window washer is stopped by the pressing operation of the switch member. I made it. In other words, when the front window is stored on the inner surface of the cab ceiling when the front window is operated in this stored state, when compared to the case of a cab in which the wiper is directly attached to the front window, the structure inside the cab and the like are removed. Interference may cause damage to the wiper or structure, but in the case of the present invention,
Since the limit switch is built into the rear stopper and the pressing portion is made to protrude, an interlock of the wiper when the front window is stored in the cab ceiling can be configured. It is conceivable to operate this limit switch when the front window is closed, but in this case, the limit switch will be arranged at the upper position of the front of the cab or at the lower position of the front window which may obstruct the driver's view, and The location or arrangement is difficult. In this respect, according to the present invention, the switch member is provided inside (or mounted close to) a rear stopper fixed to the vicinity of the rear ceiling of the cab, which does not obstruct the view and has a relatively large room in the room. I have. According to this, even if the rear stopper is enlarged for this reason, it does not adversely affect the visibility, the indoor space, and the like, which is advantageous.

The switch member is covered with a flexible resin material integrally with the contact portion of the rear stopper. Therefore, even when the front window wet by rain or the like is stored, it is possible to prevent the limit switch having the switch member from breaking down due to intrusion of rainwater.

[0010] A spring member is attached to the lever member and the first link member. When the front window is pressed and fixed, the spring member points the handle portion to an operation position where the front window is pressed and fixed. When the front window is unlocked, the handle is urged toward an operation position where the front window is unlocked. That is, since the spring member is attached to the first link and the lever member, it is possible to prevent rattling of the lever member (handle portion) and to hold the pressed and fixed state by the spring force, so that the careless release of the locked state can be prevented. Can be prevented. In addition, since the handle is urged toward the unlocked state based on the amount of operation of the handle, accidental locking in the unlocked state can be prevented, and unexpected movement of the front window when opening the front window is stopped. 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 close to the inner wall of the cab, so that the occupation of the interior space by the handle portion during operation of the construction machine can be minimized. It is possible to prevent the handle portion from blocking the view.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a main part side view showing a cab 15 provided with a front window device according to one 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) disposed on the inner wall surface of the cab 15, and the right guide rail 16R is not shown because it is on the near side.
Reference numeral 7 denotes a front window which is locked and fixed at a window closing position on the front surface of the cab 15, 18 denotes a windshield of the front window 17, and 19L and 19R denote rollers attached to left and right ends of a lower portion of the front window 17, respectively. The roller 19L is mounted on the opposite side of the roller 19R and cannot be seen in the drawing. The upper rollers 20L and 20R are also mounted, but the reference numerals thereof are not shown in FIG. Is a lever member for operating locking and unlocking of the front window 17; 22 is a rear stopper for abutting the upper end of the front window 17 when the front window 17 is at the window opening position on the inner surface side of the cab ceiling 23; A wiper for wiping the windshield 18 and a wiper 25
This is a driving wiper motor.

FIG. 2 is an enlarged detail view of a portion B in FIG. In the front window device of the present embodiment, the lever member 2
The link (31) structure having a 1
Are provided symmetrically on both left and right ends of the upper part of the upper part of FIG. A roller 20R (shown by an imaginary line) is provided at the upper right end of the front window 17 and is fitted to a right guide rail 16R (not shown) (the upper left roller 20L is opposite to the roller 20R). Because it is not visible in the illustration),
Reference numeral 26 denotes a front stopper made of a synthetic resin material such as a rubber material, which is a material attached to abut the front corner at the upper end of the front window 17 when the front window 17 is at the window closing position on the front surface of the cab 15; A bracket fixed to the upper inner surface side of the window 17, 21 a is a handle portion formed on the lever member 21, 30 is a pivot shaft set on the bracket 29, 34 is the same direction as the pivot shaft 30 and is eccentric The first link shaft set at the position, 32 is a roller shaft pivotally supporting the roller 20R, 36 is a second link shaft, 33 is a first link member, 35 is a 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, and reference symbol B denotes a front window 17
Is the unlocking operation position and angle θ at which the first link member 33 and the second link member 35 are formed when the handle portion 21a is operated to the lock operation position c.
Reference numeral 43 denotes the cab 1 provided on the inner surface side of the cab 15 when the front window 17 is in the window closed position (when the front window 17 is locked).
It is a seal member for keeping the contact surface between the front window 5 and the front window 17 watertight. FIG. 3 is a main part side view showing a state where 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 between the first link member 33 and the second link member 35 changes to the angle θ ′.

FIG. 4 is a front view of the main part as viewed from C in FIG. In the figure, reference numeral 38 denotes a spring hooking pin fixed to one end of the lever member 21 and locks one end of the spring 37, and 39 denotes a pin fixed to one end of the first link member 33 and engages the other end of the spring 37. This is a spring hook pin that stops. FIG. 5 is a plan view of a main part viewed from D in FIG. FIG. 6 is a cross-sectional view of a main part taken along line EE in FIG.
FIG. 7 is an enlarged view of a portion F in FIG.
FIG. 7 is a view showing a state in which the window 7 is moved to a 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.

FIG. 8 is a vertical sectional view of a main part showing the rear stopper 22 of the first embodiment in FIG. In the figure, 2
Reference numeral 2 denotes a rear stopper formed of a synthetic resin material having elasticity such as a rubber material into a cylindrical shape, 42 denotes a stopper supporting body of the rear stopper 22, and 44 and 45 fasten the stopper supporting body 42 to the structural member 40 of the cab 15. A fixed nut 46 is a limit switch provided in the rear stopper 22, and a pressing portion 47 protrudes from the limit switch 46. FIG. 9 is a diagram viewed from G in 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 immersed. FIG. 10 is a perspective view of a main part of the cab 15 in FIG. 1 as viewed from obliquely above the front side. In the figure,
Reference numeral 50 denotes a window washer which is one of cleaning and maintenance devices for the windshield 18, and 51 denotes 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 supply.

Next, the structure and operation of the front window device according to one embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the front window 17 is
5 In a construction machine (hydraulic shovel or the like) movable between a closed position on the front surface and an open position on the inner surface of the cab ceiling 23, a bracket 2 fixed to the front window 17
9, 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 at an eccentric position; a first link member 33 having one end attached to the first link shaft 34 so as to be rotatable 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 35. A second link shaft 36 fixed to the front window 17, a roller 20R pivotally supported by the roller shaft 32, and a roller 20R, which pivotally support the roller 20R in the front-rear direction. With A guide rail 16R which are left and right parallel disposed near the front sides of the cab 15, the cab 1
5 has a front stopper 26 for restricting the vertical movement of the front window 17 fixed on the inner surface side. Therefore, when performing an operation of locking and fixing the front window 17, the handle portion 21a is connected to the pivot shaft 30.
As shown in FIG. 2, the roller 20R is engaged with the guide rail 16R and the first link shaft 3 set at the eccentric position is rotated.
Since the position 4 moves to a position on the front side of the pivot 30, the front window 17 can be pushed out of the cab and pressed and fixed against the front stopper 26 and the seal member 43. That is, the lock fixing operation can be easily performed without performing delicate positioning as in the case of the conventional latch type lock device (shown in FIG. 16), and the vertical movement of the front window 17 can be reduced. It can be regulated reliably. The unlocking of the locked front window 17 can be easily performed by rotating the handle portion 21a downward as shown in FIG.

A front stopper 26 fixed to the inner 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 is located in front of the upper end of the front window 17. Front window vertical movement regulating surface abutting on the direction part (surface indicated by reference symbol S in FIG. 2)
It was made to have. That is, the front window vertical movement restricting surface S is formed with a restricting 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 trajectory at the time of pressing the front upper end corner of the front window 17 of the cab 15. By pressing the front upper corner portion of the upper end of the front window 17, the movement of the front window 17 in the vertical direction can be restricted.

In the present embodiment, the lever member 21
And the first link member 33 and the spring 37
(A helical spring member), and the spring 37 pushes the handle portion 21a to the front window 17 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 urged toward the operation position b where the front window 17 is unlocked. . Therefore,
The rattle of the lever member 21 (handle portion 21a) can be prevented, and the pressing and fixing state can be changed by a spring 37.
Can be held by the spring force of the above, so that careless release of the locked state can be prevented. Another handle 21a
The operation amount is biased toward the unlocked state, so that careless locking in the unlocked state can be prevented, and unexpected stoppage of the movement of the front window 17 when opening the front window 17 can be prevented. can do.

Further, the handle portion 21a is made to approach the inner wall of the cab 15 when the front window 17 is pressed and fixed. Therefore, when the front window 17 is locked, the handle portion 21a is close to the inner wall of the cab 15, so that the occupation of the cab 15 interior space by the handle portion 21a during operation of the construction machine is minimized. While being able to
It is possible to prevent the handle portion 21a from blocking the view.

In this embodiment, the wiper 24 is attached to the cab 15 and has a rear stopper 22 fixed to an inner surface near the rear of the cab ceiling 23, and the front window 17 is in the open position. The front window 1 is operated by operating the handle portion 21a.
7, the upper end (upper end) of the front glass 18 can be pressed and fixed to the rear stopper 22, and the rear stopper 22 is further provided with a switch member (limit switch 46) protruding from a contact portion with the front window 17.
When the front window 17 is pressed and fixed to the rear stopper 22, a switch member is pushed by the front window 17, and the wiper 24 and / or the window is pushed by the pushing operation of the switch member. The operation of the washer 50 is stopped. That is, for example, when the front window is stored on the inner side of the ceiling of the cab when the front window is operated in this storage state, as compared with a cab (not shown) in which the wiper is directly attached to the front window, for example. Interfering with the structure inside the cab and others,
Although the wiper or the structure may be damaged, in the case of the present embodiment, the limit switch 46 is attached to the rear stopper 22.
And the pressing portion 47 is protruded, so that the interlock of the wiper 24 when the front window 17 is stored inside the cab ceiling 23 can be configured. It is conceivable to operate the limit switch 46 when the front window is closed. In this case, however, the limit switch is disposed at the upper front position of the cab 15 or the lower position of the front window 17 which may obstruct the driver's view. In addition, it is difficult to arrange the location or the arrangement method. In this respect, in the present embodiment, the limit switch 46 is mounted inside (close to) the rear stopper 22 which is fixed near the rear ceiling of the cab 15 without obstructing the field of view and having a relatively large space in the cab 15 room. (Including the case). According to this, even if the rear stopper 22 is enlarged for this reason, the visibility, the indoor space, and the like are not adversely affected, which is advantageous.

Next, FIG. 12 shows a rear stopper 22'a of the second embodiment in the front window device of the present embodiment (the rear stopper of the first embodiment is the above-mentioned rear stopper 22 shown in FIG. 8). It is a principal part vertical sectional view. In the drawing, the same reference numerals are given to components using the same components as in the case of the rear stopper 22 of the first embodiment. FIG.
In the rear stopper 22'a shown in FIG. 2, the stopper support main body 42'a is formed of a rough material of a mold, and the limit switch 46 is incorporated in a frame portion 55 of the stopper support main body 42'a.

FIG. 13 shows a rear stopper 2 of the third embodiment.
It is a principal part side view which shows 2'b. In the drawing, the same reference numerals are given to components using the same components as in the case of the rear stopper 22 of the first embodiment. In the structure of the rear stopper 22'b shown in FIG. 13, a substrate metal fitting 57 is provided on the stopper support body 42'b for fixing the rear stopper 22'b,
A limit switch 46 'is attached to an end of the substrate metal fitting 57.

FIG. 14 shows a rear stopper 2 of the second embodiment.
FIG. 11 is a vertical sectional view of a main part of a rear stopper 22′c showing a modification of 2′a (including the rear stopper 22 of the first embodiment and the rear stopper 22′b of the third embodiment). In the figure,
In the second embodiment, the same reference numerals are given to components using the same components as those of the rear stopper 22'a. The rear stopper 22'c shown in FIG.
The main body portion c and the pressing portion 47 of the limit switch 46 are integrally covered with a rubber film 56 made of a synthetic resin material having flexibility. 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 breaking down due to intrusion of rainwater.

[0024]

According to the front window device of the present invention, when the front window is locked at the closed position on the front surface of the cab or at the open position on the inner surface of the cab ceiling, the handle portion is turned upward. Since the position of the first link shaft set at the eccentric position moves in a state where the roller of the front window is fitted to the roller guide rail of the cab, the front window is pushed out of the cab and the front stopper is pushed out. And it can press and fix to a sealing member. That is, the lock fixing operation can be easily performed without performing delicate positioning as in the conventional latch type lock device,
Also, the vertical movement of the front window can be reliably restricted. When the front stopper has a front window vertical movement restricting surface, the front window vertical movement restricting surface is a slope intersecting the movement locus of the front upper corner of the front window of the cab at the time of pressing. Is pressed against the seal member with the front window lower end as a fulcrum, and at the same time, the front window upper front corner is smoothly pressed against this slope, so that it can be pressed and fixed without rattling, and the vertical front can be fixed. The movement of the window can be reliably regulated. In the above case, a spring member is attached to the lever member integrated with the handle portion and the first link member. Therefore, the backlash of the lever member (handle portion) can be prevented, and the pressed and fixed state can be held by the spring force of the spring member, so that the careless release of the locked state can be prevented. A certain amount of operation of the handle part is biased toward the unlocked state, which prevents inadvertent locking in the unlocked state, and unexpectedly stops moving the front window when opening the front window Can be prevented. Further, when the front window is locked, the handle portion is close to the inner wall of the cab, so that the occupation of the interior space by the handle portion during work of the construction machine can be minimized. It is possible to prevent the handle portion from blocking the view. Further, in the present invention, a limit switch is provided on a rear stopper fixed to an inner surface portion near the rear of the cab ceiling, and a pressing portion thereof is protruded. An interlock can be configured. It is conceivable to operate this limit switch when the front window is closed, but in this case, the cab front upper position, which may obstruct the driver's view,
Or it is difficult to place or arrange the front window. In this respect, according to the present invention, the switch is mounted (including a case where the switch is mounted close to) inside the rear stopper fixed to the vicinity of the rear ceiling of the cab, which does not obstruct the view and has a relatively large room in the room. ing. According to this, even if the rear stopper is enlarged for this reason, it does not adversely affect the visibility, the indoor space, and the like, which is advantageous.
Further, since the switch member is covered with a flexible resin material integrally with the contact portion of the rear stopper, the switch member has a switch member even when the front window wet by rain or the like is stored. The limit switch can be prevented from breaking down due to rainwater intrusion.

[Brief description of the drawings]

FIG. 1 is a side view of a main 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. 1;

FIG. 3 is a side view of a main part showing a state where a front window in FIG. 2 is unlocked.

FIG. 4 is a front view of a main part as viewed from C in FIG. 3;

FIG. 5 is a plan view of a main part as viewed from D in FIG. 3;

FIG. 6 is a cross-sectional view of a main part taken along line EE in FIG. 3;

FIG. 7 is an enlarged view of a portion F in FIG. 1, but showing a state in which the front window is moved to a window opening position on the inner surface side of the cab ceiling.

FIG. 8 is a vertical sectional view showing a main part of the rear stopper of the first embodiment in FIG. 7;

FIG. 9 is a diagram viewed 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 above the front side.

11 is an electric circuit diagram to which the limit switch in FIG. 8 is connected.

FIG. 12 is a vertical sectional view showing a main part of a rear stopper in Example 2 of the present embodiment.

FIG. 13 is a vertical sectional view of a main part showing a rear stopper of the third embodiment.

FIG. 14 is a vertical 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 example of the prior art.

FIG. 16 is a cross-sectional view of a main part taken along line AA of FIG.

[Explanation of symbols]

 1, 15 Cab 2, 17 Front window 4L, 4R, 16L, 16R Roller guide rail 21 Lever member 21a Handle portion 22, 22'a, 22'b, 22'c Rear stopper 24 Wiper 26 Front stopper 32 Roller shaft 33 1st link member 34 1st link shaft 35 2nd link member 36 2nd link shaft 37 Spring 43 Sealing member 46, 46 'Limit switch 47 Pressing part 50 Window washer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Fujimoto 3-12-4 Gion, Asaminami-ku, Hiroshima-shi, Hiroshima

Claims (6)

[Claims] 1. A construction machine wherein a front window is movable between a closed position on a front surface of a cab and an open position on an inner surface of a cab ceiling, wherein a bracket fixed to the front window and a bracket set on the bracket are provided. A lever member pivotally supported on the pivot shaft so as to be able to rotate in the front-rear direction; a handle portion formed on the lever member; and a second eccentric position set in the same direction as the pivot shaft of the lever member. One link shaft, a first link member having one end attached to the first link shaft to be rotatable in the front-rear direction, a roller shaft set at the other end of the first link member, and the roller shaft A second link member one end of which is rotatably mounted in the front-rear direction, and a second link shaft fixed to the front window while pivotally supporting the second link member in the front-rear direction. And said A roller rotatably supported by a roller shaft, a roller guide rail that guides the roller, and is disposed parallel to the left and right sides near the front side of the cab, and the roller that is fixed to the inner surface of the cab. A cab for a construction machine, comprising: a stopper for restricting a vertical movement of a front window, wherein the front window is pushed out of the cab by operating the handle portion so as to be pressed and fixed to the stopper. Manual opening / closing front window device. 2. The vehicle according to claim 1, wherein the stopper has a front stopper fixed to an inner surface at an upper portion of a front surface of the cab, and when the front window is in a closed position, an upper end of the front window is operated by operating the handle. Can be fixed by pressing against the front stopper, and the stopper is
2. The front opening / closing front window device for a cab for a construction machine according to claim 1, wherein the front window has an elasticity and has a front window vertical movement regulating surface abutting on a front corner of an upper end of the front window. 3. A cab for a construction machine in which a wiper is mounted on a front window, wherein the stopper has a rear stopper fixed to an inner surface near the rear of a ceiling of the cab, and the front window is in an open position. When the handle is operated, the upper end of the front window can be pressed and fixed to the rear stopper by operating the handle portion, and the rear stopper has a switch member protruding from a contact portion with the front window. When the front window is pressed and fixed against the rear stopper, a switch member is pushed by the front window, and the operation of the wiper and / or the window washer is stopped by the pushing operation of the switch member. The cab hand for a construction machine according to claim 1 or 2, characterized in that: Dynamic opening and closing type front window device. 4. The cab for a construction machine according to claim 3, wherein the switch member is covered with a flexible resin material integrally with the contact portion of the rear stopper. Front window device. 5. A spring member is mounted over the lever member and the first link member, and the spring member directs the handle portion to an operation position where the front window is pressed and fixed when the front window is pressed and fixed. 5. The construction machine according to claim 1, wherein when the front window is unlocked, the handle portion is biased toward an operation position where the front window is unlocked. 6. Cab manual opening and closing front window device. 6. The manual front window device for a cab for a construction machine according to claim 1, wherein the handle portion is positioned close to an inner wall of the cab during a pressing operation of the front window.