JP4346498B2 - Window glass opening and closing mechanism - Google Patents

Description

  The present invention relates to a window glass opening / closing mechanism provided to cover a window frame provided in a cabin mounted on a work vehicle such as a tractor.

In recent years, in cabins mounted on work vehicles such as tractors, window glass has been deployed over almost the entire left and right side surfaces and rear side surfaces to expand the field of view of operators working in the cabin as much as possible. Have been developed (see, for example, Patent Document 1).
In this type of cabin, in general, in order to improve the ventilation efficiency inside the cabin, the window glass is pivotally supported by the window frame so that it can be opened and closed. And a door handle for opening and closing a door that extends horizontally on the inner surface of the window glass, and a lever that is provided along the door handle. An end is pivotally supported by the door handle so as to be pivotable in the horizontal direction, and the support is engaged with the lever so as to be relatively movable in a sliding groove provided on the bottom of the lever. Accordingly, the window glass of the cabin can be set in a plurality of half-opening postures by engaging the front end portions of the support body with a plurality of engagement holes formed in the sliding groove. Switchgear has been proposed (special References 2).
Japanese Patent Laid-Open No. 08-132868 JP 09-240270 A

However, in the cabin window glass opening and closing device, when the full opening angle of the window glass with respect to the cabin is set large, the door handle arranged on the open end side of the window glass is greatly separated from the driver seat, There is a problem that the operator who sits on the door cannot hold the door handle to open and close the window glass.
Further, the cabin window glass opening and closing device moves the support relative to the sliding groove formed in the lever, and engages the tip of the support with the engagement hole in the sliding groove. There is a problem that the half-opening posture of the glass is set, and the structure for setting the half-opening posture of the window glass is complicated.

  Therefore, in view of the above problems, an object of the present invention is to operate the window glass from the fully open position to the closed position while the operator is seated on the driver's seat even when the window glass is fully opened with respect to the cabin. And a window glass opening / closing mechanism capable of setting the window glass in a half-opening posture with a simple configuration.

Specific means for solving the problems in the present invention are as follows.
First, a window glass 25 is pivotally supported on the window frame 24 of the cabin 6 disposed so as to cover the driver's seat 8 a so as to be openable and closable toward the outside of the cabin 6. An auxiliary handle 33 for closing the window glass 25 is provided, and the auxiliary handle 33 can be used by the operator's hand seated on the driver's seat 8a even when the grip 38a at the front end is in the fully open position. The base portion 37a is pivotally supported between a posture in which the grip portion 38a is arranged along the window glass 25 and a posture in which the grip portion 38a is projected toward the driver's seat 8a. The window frame 24 is provided with an engaging body 32 that engages with the gripping portion 38a when the window glass 25 is set in a half-open position, and a base portion 37a of the auxiliary handle 33 is supported on the inner surface of the window glass 25. Support 35 is provided, the torsion coil spring 39 and the auxiliary wheel 33 is biased in a posture along the window glass 25 in a state that releases the engagement with the engaging body 32 is wound around the base 37a It is.

Then, a window glass 25 is pivotally supported on the window frame 24 of the cabin 6 provided so as to cover the driver's seat 8a so as to be openable and closable toward the outside of the cabin 6. An auxiliary handle 63 for closing the glass 25 is provided, and the auxiliary handle 63 is a position at which the operator's hand seated on the driver's seat 8a can reach even when the grip portion 68a at the front end has the window glass 25 in the fully open position. The base portions 67a and 67b are pivoted between a posture in which the grip portion 68a is aligned with the window glass 25 and a posture in which the grip portion 68a is projected toward the driver's seat 8a. The window frame 24 is provided with an engagement body 32 that engages with the gripping portion 68a when the window glass 25 is set in a half-open position, and each base 67a of the auxiliary handle 63 is provided on the inner surface of the window glass 25. , 7b is provided, and the auxiliary handle 63 is disengaged from the engaging body 32 so that the auxiliary handle 63 is placed along the window glass 25. In other words, the bases 67a and 67b are pivoted in the vertical direction so as to be urged in a posture along the direction.

  In addition, a window glass 25 is pivotally supported on the window frame 24 of the cabin 6 disposed so as to cover the driver's seat 8a so as to be openable and closable toward the outside of the cabin 6. An auxiliary handle 33 for closing the glass 25 is provided, and the auxiliary handle 33 is a position where the hand of the operator seated on the driver's seat 8a can reach even when the grip portion 38a at the front end has the window glass 25 fully open. The base 37a is pivotally supported between a posture in which the grip portion 38a is aligned with the window glass 25 and a posture in which the grip portion 38a is protruded toward the driver's seat 8a. The window frame 24 is provided with an engaging body 32 that engages with the grip portion 38a when the window glass 25 is set in a half-open position.

According to this configuration, even when the window glass 25 is in the fully open posture, the operator can reach the grip portion 38a of the auxiliary handle 33 while sitting on the driver's seat 8a, and the grip portion 38a can reach the driver's seat 8a. By pulling toward the driver's seat 8a, the grip portion 38a is relatively changed from a posture along the window glass 25 to a posture protruding toward the driver's seat 8a. It is drawn toward 6 and set in a closed posture.
In addition, the window glass 25 is set in a half-opening posture by an easy operation of engaging the grip portion 38a of the auxiliary handle 33 with the engaging body 32, whereby the auxiliary handle 33 opens the window glass 25 in a half-opening posture. Therefore, it also functions as a support member for setting.

Secondly, a support body 35 for supporting the base portion 37a of the auxiliary handle 33 is provided on the inner surface of the window glass 25, and the support body 35 has locking means 34 for locking the window glass 25 in a closed position. That is, the lock lever 41 is supported.
According to this configuration, by attaching the support 35 to the inner surface of the window glass 25, the auxiliary handle 33 and the lock lever 41 are arranged on the inner surface of the window glass 25, so that the assembly process of the cabin 6 is simplified and the cabin 6 The production efficiency is improved.
Third, the engagement body 32 of the window frame 24 includes an engagement portion 52 that engages with the grip portion 38 a of the auxiliary handle 33 and a locked member that engages with a lock piece 43 formed on the lock lever 41. That is, the portion 53 is formed.

  According to this configuration, the engaging portion 52 and the locked portion 53 are centrally arranged on the window frame 24 by the engaging body 32, so that the number of parts is reduced and the cost is reduced.

  According to the present invention, even when the full opening angle of the window glass with respect to the cabin is set large, the window glass can be operated from the fully open position to the closed position while the operator is seated on the driver's seat, and simple. It becomes possible to set this window glass to a half-opening attitude | position by a structure.

1st Embodiment Below, 1st Embodiment which implemented this invention to the tractor 1 is described with reference to FIGS.
FIG. 7 shows the rear part of the tractor 1. The tractor 1 includes an engine 2 and a transmission case 4 having a power transmission mechanism for transmitting the power of the engine 2 to a pair of left and right rear wheels 3. Etc., and a traveling vehicle body 5 directly connected to each other. A cabin 6 is mounted on the rear upper portion of the traveling vehicle body 5, and a front upper portion is covered with a bonnet 7.

The cabin 6 is detachably mounted via a cushion on a support bracket (not shown) projecting left and right from the front portion of the mission case 4 and a mounting base 4a attached to the rear axle case. In the cabin 6, an operating device 8 having a steering handle at the front is provided, and a driver's seat 8a is provided at the rear.
The cabin 6 is constructed of a frame by a cabin frame body 9 formed by a rectangular pipe material having a hollow cross section in a box shape.
The cabin frame 9 has a pair of left and right front struts 10 and a rear strut 11, and a pair of left and right intermediate struts 12 positioned in the middle thereof. Each of the struts 10, 11, and 12 has a rectangular upper end. The lower frame 14 is connected to a lower frame 14 bent along the fender 4 b, and a roof 15 is provided on the upper frame 13.

A front side frame 16 serving as an entrance for an operator is defined by the front column 10, the intermediate column 12, and the upper and lower frames 13 and 14 of the cabin frame 9. The side front frame 16 can be freely opened and closed. The door window 17 is pivotally supported on the intermediate column 12 via a pair of upper and lower hinges 18, 18, whereby the door window 17 can be opened and closed toward the outside of the cabin 6.
A door lock 20 that locks the door window 17 with respect to the side front frame 16 is provided at the front portion of the door window 17. The door lock 20 allows the door window 17 to be locked to the side front frame 16. By locking the door window 17, the door window 17 is held in the closed position.

Further, in the closed state of the door window 17, the weather strip 28 at the outer peripheral edge of the door window 17 is pressed against the side front frame 16, whereby the door window 17 and the side front frame 16 are separated from each other. A seal is applied between them.
Further, a side window 21 is fitted into the side rear frame 19 defined by the intermediate column 12, the rear column 11, and the upper and lower frames 13, 14 of the cabin frame 9, and the left and right front columns 10 and the upper and lower frames 13, 14 A windshield 23 is fitted into the partitioned front frame 22.

Further, as shown in FIG. 2, a rear frame (window frame) 24 is defined on the rear surface of the cabin 6 by a pair of left and right rear columns 11, 11 and upper and lower frames 13, 14. The rear frame 24 is provided with a rear glass (window glass) 25 having a quadrilateral view, and the rear glass 25 is moved up and down on the upper frame 13 via a pair of left and right hinges 26 and 26 provided at the upper end of the outer surface. It is pivotally supported so that it can be opened and closed toward the outside of the cabin 6 as shown in FIG.
Further, as shown in FIG. 7, dampers 27 are interposed between the left and right side edges of the rear glass 25 and the lower frame 14, so that when the rear glass 25 is brought into a closed posture from the opened state. The resulting impact on the rear frame 24 is absorbed.

Further, as shown in FIG. 2, a rear glass opening / closing mechanism (window glass opening / closing mechanism) 30 for an operator seated in the driver's seat 8 a to open and close the rear glass 25 is provided at the rear of the cabin 6. Are provided.
The rear glass opening / closing mechanism 30 includes a glass opening / closing operation portion 31 provided on the rear glass 25 side, and an engaging body 32 provided on the rear frame 24 and to be engaged with the glass opening / closing operation portion 31. The opening / closing operation part 31 is provided in the center part in the width direction on the lower end (free end) side of the rear glass 25, and the engaging body 32 is provided in the center part in the width direction of the lower frame 14 that defines the rear frame 24.

As shown in FIG. 4, the glass opening / closing operation unit 31 includes an auxiliary handle 33 for closing the rear glass 25 in the open position, a locking means 34 for locking the rear glass 25 to the rear frame 24, an auxiliary handle 33, It is comprised from the support body 35 which supports the locking means 34. As shown in FIG.
The support 35 is formed by pressing a metal plate, and is positioned between the pair of left and right flat plate portions 35a and 35a that support the auxiliary handle 33 and the pair of left and right flat plate portions 35a and 35a. A U-shaped bracket portion 35b that supports the locking means 34 is provided, and the support 35 is fixed to the inner surface of the rear glass 25 via fixing means such as bolt fastening.

The auxiliary handle 33 is formed in a U-shape in a rear view by bending a metal or resin-made bar having a circular cross section, and extends in the width direction of the pair of left and right legs 37, 37 and the rear glass 25 so that the pair of right and left 1, except for the case where the operator operates the auxiliary handle 33, as shown in FIG. 1, both the leg portions 37, 37 and the connecting portion are connected to each other. 38 is held in a posture along the inner surface of the rear glass 25.
As shown in FIGS. 1 and 3, the connecting portion 38 is formed with a grip portion 38 a in which the central portion of the connecting portion 38 protrudes toward the driver's seat 8 a from both leg portions 37, 37. .

  As shown in FIG. 4, the pair of left and right legs 37, 37 of the auxiliary handle 33 has a base 37 a formed by bending the lower end toward the bracket 35 b of the support 35. The axis of the base portions 37a, 37a of 37, 37 coincide with each other in the same plane as both the leg portions 37, 37, and each base portion 37a is attached to the support 35 by welding or the like via a bush. Each is pivotally supported. As a result, the auxiliary handle 33 can swing freely with respect to the rear glass 25 with the axis formed by the bases 37a and 37a as the rotation axis.

As shown in FIG. 2, when the auxiliary handle 33 is set to a posture in which the gripping portion 38a is aligned with the rear glass 25, the gripping portion 38a has an upper end (pivot end) of the rear glass 25 rather than the pair of left and right base portions 37a and 37a. 1), the gripping portion 38a protrudes from the rear glass 25 as shown by a two-dot chain line in FIG. 1 by drawing the gripping portion 38a toward the driver's seat 8a. Will be set to the posture.
Also, as shown in FIGS. 4 and 5, a torsion coil spring 39 is wound around each base portion 37a. The torsion coil spring 39 has one end hooked to the leg portion 37 of the auxiliary handle 33 and the other end hooked to the support 35. The torsion coil spring 39 is assisted by the biasing force of the torsion coil spring 39. The handle 33 is always urged from the posture in which the grip portion 38 a protrudes with respect to the rear glass 25 toward the posture in which the grip portion 38 a is along the rear glass 25.

Further, each base portion 37 a is provided with a flat plate-shaped detent member 37 b standing at a predetermined mounting angle, and the detent member 37 b is attached to the support 35 as the auxiliary handle 33 is opened. By abutting against the flat plate portion 35a, the opening operation of the auxiliary handle 33 is hindered, so that the opening angle of the auxiliary handle 33 falls within a predetermined angle range.
Accordingly, the auxiliary handle 33 does not rotate downward greatly beyond the position protruding with respect to the rear glass 25, and a large external force against the urging force acts on the torsion coil spring 39 by the opening operation of the auxiliary handle 33. In addition, the torsion coil spring 39 is prevented from being extended and damaged by the external force.

Further, the base 37a of the leg portion 37 of the auxiliary handle 33, the torsion coil spring 39, the collar 36 attached to the flat plate portion 35a of the support 35, and the like are respectively provided by plate-like covers 36a erected from the flat plate portion 35a. Covered.
As shown in FIG. 4, the lock means 34 has a lock lever 41 arranged between a pair of left and right legs 37, 37 of the auxiliary handle 33. The lock lever 41 is supported as shown in FIG. A shaft body 42 having an axial center extending vertically from the bracket portion 35b of the body 35 toward the inner surface of the rear glass 25, a lock piece 43 formed at an end of the shaft body 42 on the rear glass 25 side, and the shaft body 42 The lever 44 is provided at the end of the driver's seat 8a, and the shaft body 42 is pivotally supported by the bracket portion 35b of the support body 35 so as to be rotatable about the axis.

  Further, as shown in FIG. 4, the lock piece 43 is attached to the shaft body 42 at a predetermined angle with respect to the lever 44 when viewed from the rear side, whereby the long axis of the lever 44 is connected to the auxiliary handle 33. When the lock lever 41 is rotated so as to be perpendicular to the rotation axis, the lock piece 43 is set in a posture in which the long axis is inclined with respect to the rotation axis, and the lever 44 is moved to the predetermined angle. By rotating in the clockwise direction as indicated by the arrow in the figure, the long axis of the lock piece 43 is set to a posture that is perpendicular to the rotation axis. By setting the lock piece 43 of the lock lever 41 in the vertical posture in a state where the rear glass 25 is set in the closed posture, the lower end portion of the lock piece 43 is engaged with the engagement body 32.

The engaging body 32 is disposed at the center of the support base 51 extending in the width direction of the lower frame 14 of the rear frame 24, and as shown in FIG. 5, the engaging body 32 is to be engaged with the grip portion 38a of the auxiliary handle 33. A portion 52, and a portion 53 to be locked that is disposed between the engagement portion 52 and the rear glass 25 and is to be engaged with the lock piece 43 of the lock lever 41. A concave portion 52 a that extends in the width direction of the lower frame 14 and that engages the grip portion 38 a of the auxiliary handle 33 is formed on the surface facing the locked portion 53.
The locked portion 53 is formed by a leaf spring in which an urging force is applied toward the engaging portion 52, and the length between the opposing surfaces of the recessed portion 52 a of the engaging portion 52 and the locked portion 53 is long. Is disposed at a position facing the concave portion 52a of the engaging portion 52 so that the diameter is smaller than the diameter of the grip portion 38a of the auxiliary handle 33.

The door window 17, the side window 21, and the rear glass 25 do not have a rigid metal frame as before in order to widen the field of view of the operator from the cabin 6 as much as possible. The entire surface is composed of a frameless panel made of transparent glass, and only the rubber weather strip 28 fixed over the entire outer periphery is provided at the outer peripheral edge.
The embodiment of the present invention is configured as described above. Next, the opening / closing operation of the rear glass 25 will be described.

When the rear glass 25 is locked to the rear frame 24 in a closed posture, the lock lever 41 is set in a posture in which the lever 44 is inclined with respect to the axis of the rotation axis of the auxiliary handle 33 as shown in FIG. Accordingly, the lower end portion of the lock piece 43 of the lock lever 41 is set in a posture facing the lower frame 14 of the rear frame 24.
At this time, as shown in FIG. 5, the lower end portion of the lock piece 43 is engaged with the locked portion 53 while being positioned between the engaging portion 52 of the engaging body 32 and the locked portion 53. As a result, the opening / closing operation of the rear glass 25 is restricted.

When the rear glass 25 is opened from this state, first, the lever 44 of the lock lever 41 is grasped and the lock lever 41 is rotated counterclockwise as indicated by an arrow in FIG. Along with the rotation, the lock piece 43 of the lock lever 41 is released from the engaged state with the locked portion 53 when the lower end portion rotates and moves obliquely upward to the right in the rear view. The frame 24 can be freely opened and closed.
The rear glass 25 is opened outward with respect to the cabin 6 by pushing the lever 44 outward from the cabin 6 while holding the lever 44 of the lock lever 41.

At this time, the rear glass 25 opens and closes around the rotation axis of the pair of left and right hinges 26, 26 arranged at the upper end of the outer surface, and the operator can move the rear glass 25 with respect to the rear frame 24 as indicated by a two-dot chain line in FIG. It is possible to open the rear glass 25 to the fully open posture having the maximum opening angle. The rear glass 25 in the fully open position is supported by a pair of left and right dampers 27, 27 shown in FIG. 7, and even if the operator does not support the rear glass 25, the rear glass 25 is not automatically closed by its own weight.
When closing the fully open rear glass 25, first, the rear glass 25 is drawn toward the driver's seat 8a.

At this time, in the rear glass 25 in the fully open position, the auxiliary handle 33 has its gripping portion 38a positioned closer to the driver's seat 8a than the lever 44 of the lock lever 41. It is located within the reach of the seated operator. For this reason, the operator can grip the grip portion 38a of the auxiliary handle 33 while sitting on the driver's seat 8a. By pulling the grip portion 38a toward the driver's seat 8a, the rear glass 25 is closed. It will swing toward.
At this time, in the auxiliary handle 33, the base portions 37a and 37a of the pair of left and right leg portions 37 and 37 are pivotally supported by the support 35 so that the grip portion 38a of the auxiliary handle 33 faces the driver's seat 8a. As a result, the posture of the auxiliary handle 33 is changed from the posture in which the grip portion 38 a is along the inner surface of the rear glass 25 to the posture in which the grip portion 38 a is protruded from the rear glass 25.

Here, the grip portion 38a of the auxiliary handle 33 has the axial centers of the pair of left and right legs 37, 37 aligned with the line of action of the tensile force acting on the bases 37a, 37a of the pair of left and right legs 37, 37. Accordingly, the pulling force for pulling the auxiliary handle 33 of the operator is efficiently transmitted to the rear glass 25, and the rear glass 25 can be easily closed even when the grip 38a of the auxiliary handle 33 is pulled with a small force. Swing toward
In addition, the grip portion 38a of the auxiliary handle 33 moves relatively so that the axis of the pair of left and right legs 37, 37 coincides with the action line that changes its direction as the rear glass 25 swings. The pulling operation of the auxiliary handle 33 for closing is smoothly performed.

Then, the rear glass 25 is pulled to a position that fits in the rear frame 24, and the lever 44 of the lock lever 41 is rotated to engage the lock piece 43 with the locked portion 53 of the engaging body 32 again. The frame 24 is locked again. Here, the weather strip 28 provided on the outer peripheral edge portion of the rear glass 25 is pressed against the rear frame 24, whereby a seal is applied between the rear glass 25 and the rear frame 24.
When the rear glass 25 is set to the half-opening posture, first, the rear glass 25 is set to an appropriate opening posture by performing the opening operation as described above. Next, the gripping portion 38a of the auxiliary handle 33 is swung at a swing angle of approximately 90 degrees and pulled toward the driver's seat 8a, and the posture of the auxiliary handle 33 is changed from the posture in which the gripping portion 38a is along the rear glass 25 to the rear glass. 25 to change to the most distant posture.

Then, as shown in FIGS. 1 and 6, the holding portion 38 a of the auxiliary handle 33 is inserted between the engaging portion 52 of the engaging body 32 and the locked portion 53 and is engaged with the concave portion 52 a of the engaging portion 52. . Here, the length between the recess 52 a of the engaging portion 52 and the locked portion 53 is smaller than the diameter of the gripping portion 38 a, and the urging force acts on the locked portion 53 toward the engaging portion 52. Since the grip portion 38a of the auxiliary handle 33 is engaged with the recess 52a of the engagement portion 52, the grip portion 38a of the auxiliary handle 33 is sandwiched between the engagement portion 52 and the locked portion 53. Become.
Accordingly, the auxiliary handle 33 is locked to the engaging body 32 while maintaining the swing angle with respect to the rear glass 25, whereby the rear glass 25 has an appropriate opening angle with respect to the rear frame 24. It will be set to the half opening posture which has.

  Further, by swinging the auxiliary handle 33 toward the rear glass 25 and releasing the engagement state between the grip portion 38a and the engagement body 32, the half-opening posture of the rear glass 25 as described above can be easily released. . At this time, the auxiliary handle 33 is biased from the posture in which the grip portion 38a is protruded from the rear glass 25 toward the posture in which the grip portion 38a is along the inner surface of the rear glass 25. By performing an operation of releasing the engagement state with the combined body 32, the auxiliary handle 33 automatically returns to a posture in which the grip portion 38a is placed along the inner surface of the rear glass 25.

  According to the above-described embodiment, even when the rear glass 25 is set to the fully open posture, the operator's hand reaches the grip portion 38a of the auxiliary handle 33 while being seated on the driver's seat 8a. It is not necessary to stand up from the driver's seat 8a and greatly extend behind the driver's seat 8a to grip the lock lever 41 located farther from the auxiliary handle 33, but closer to the driver's seat 8a than the lock lever 41. By gripping and pulling the grip portion 38a of the auxiliary handle 33 disposed on the rear handle 25, the rear glass 25 can be closed while seated on the driver's seat 8a.

Further, the auxiliary handle 33 also functions as a support member for the rear glass 25 set in the half-opening posture, whereby the support mechanism for setting the rear glass 25 in the half-opening posture becomes simple, and a new rear glass support mechanism is provided. There is no need to provide it, and the number of parts constituting the cabin 6 can be reduced and the cost can be reduced.
The auxiliary handle 33 is supported by the support 35 together with the lock lever 41 of the locking means 34 that locks the rear glass 25 in the closed position, and the support 35 is attached to the inner surface of the rear glass 25. The number of parts is reduced as compared with the configuration in which the lock lever 41 and the lock lever 41 are separately attached to the rear glass 25, and the assembly process of the cabin 6 is simplified, so that the manufacturing efficiency of the cabin 6 can be improved and the cost can be reduced.

Furthermore, since the engaging body 32 is formed by concentrating the engaging portion 52 and the locked portion 53 at the center in the width direction of the lower frame 14 of the rear frame 24, the number of parts can be reduced even in this configuration. In addition, the assembly process of the cabin 6 is simplified, so that the manufacturing efficiency of the cabin 6 can be improved and the cost can be reduced.
The rear glass opening / closing mechanism 30 according to the present embodiment, which includes the glass opening / closing operation unit 31 including the auxiliary handle 33 and the lock lever 41 and the engaging body 32, includes a lower end side and a rear portion of the rear glass 25 at the center in the width direction. Since the rear frame opening / closing mechanism 30 does not narrow the rear view of the operator seated in the driver's seat 8a because the rear glass opening / closing mechanism 30 is compactly arranged across the central portion in the width direction of the lower frame 14 of the frame 24, a good rear Visibility is secured.
Second Embodiment Hereinafter, a second embodiment in which the present invention is applied to the tractor 1 will be described with reference to FIGS. 8 and 9.

Here, the second embodiment is different from the first embodiment in the structure in which the auxiliary handle 63 is pivotally supported on the support 35 and the urging means of the auxiliary handle 63 is different from the first embodiment. Since this is the same as that of the first embodiment, only the structure for pivotally supporting the auxiliary handle 63 on the support 35 and the urging means for the auxiliary handle 63 will be described below. The same reference numerals as those in the first embodiment are given and the description thereof is omitted.
As shown in FIGS. 8 and 9, the auxiliary handle 63 of the window opening / closing operation portion 61 of the rear glass opening / closing mechanism 60 of the second embodiment is formed by bending a metal or resin-made circular cross-section bar material and is U-shaped in rear view. The pair of left and right leg portions 67, 67 and a connecting portion 68 that extends in the width direction of the rear glass 25 and connects the upper end portions of the pair of left and right leg portions 67, 67 are formed. The leg portions 67 and 67 respectively have base portions 67a and 67b formed by bending their respective lower end portions toward the bracket portion 35b of the support 35, and one base portion located on the left side in the rear view. 67a is bent so that its axis is slightly displaced upward and to the driver's seat 8a side with respect to the axis of the other base 67b located on the right side in the rear view, whereby the auxiliary handle 63 is Said one base 6 The length h1 from a to the axial center of the connecting portion 68 is slightly smaller than the length h2 from the other base portion 67b to the axial center of the connecting portion 68, and both the base portions 67a and 67b are each a support. It is pivotally supported by the collars 36 and 36 disposed on the flat plate portion 35a of 35 so as to be swingable.

Thus, as shown in FIG. 9, the auxiliary handle 63 has a vertical bisector ( XX axis) of a straight line ( Y-Y axis) connecting the axis of one base 67a and the axis of the other base 67b. When the axis of the connecting portion 68 is positioned on the upper side, a stable posture is obtained, and when the gripping portion 68a is swung up and down from the stable posture, the auxiliary handle 63 has the axis of the connecting portion 68 as XX. A biasing force is applied so as to be positioned on the shaft, whereby the auxiliary handle 63 automatically swings to a stable posture.
Therefore, when the rear glass 25 is set to the half-opened posture, first, the auxiliary handle 63 in a posture in which the grip portion 68a is placed along the rear glass 25 shown by a solid line in FIG. 9 is drawn toward the driver's seat 8a. At this time, by pulling the gripping portion 68a toward the driver's seat 8a until the axis of the connecting portion 68 of the auxiliary handle 63 exceeds the Y-Y axis, the auxiliary handle 63 sets the axis of the connecting portion 68 to X. -The posture is automatically changed to the stable posture moved on the X axis.

The rear glass 25 is set in a half-opened posture by engaging the gripping portion 68a of the auxiliary handle 63 set in the stable posture with the engaging body 32 in the same manner as in the first embodiment.
Further, when the half-opening posture is released, the engagement between the gripping portion 68a of the auxiliary handle 63 and the engaging body 32 is released. As a result, the rear glass 25 is released from the half-opening posture and can be opened and closed again.
Then, the auxiliary handle 63 is swung until the axis of the connecting portion 68 of the auxiliary handle 63 is positioned closer to the rear glass 25 than the Y-Y axis, so that the auxiliary handle 63 has an axis of the connecting portion 68. The urging force acts so as to be positioned on the XX axis extending toward the opposite side to the stable posture, and the urging force causes the auxiliary handle 63 to move to the position where the connecting portion 68 contacts the rear glass 25. Change posture.

At this time, as shown in FIG. 9, by wrapping a cushion material 68 b or the like around the connecting portion 68, even when the connecting portion 68 vigorously contacts the rear glass 25, the rear glass 25 is caused by an impact due to the contact. There is no damage.
In the second embodiment, when the rear glass 25 is set in the half-open position, the auxiliary handle 63 is automatically brought into the stable position only by an easy operation of slightly pulling the grip portion 68a toward the driver's seat 8a. In order to change the posture, it is not necessary for the operator to hold the posture of the auxiliary handle 63, and the rear glass 25 can be set to the half-opened posture by an easier operation than in the first embodiment.

In addition, it is not necessary to attach a torsion coil spring or the like for urging the auxiliary handle 63 to the base, and the cost can be further reduced as compared with the first embodiment.
As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to said embodiment.
For example, the shape of the auxiliary handle 33 shown in the first embodiment includes a base portion 37a having an axis serving as a swing axis at one end portion of one leg portion 37, and a gripping portion at the other end portion. 38a may be provided, and any shape may be used as long as the base portion 37a and the grip portion 38a are connected.

  In addition, the auxiliary handle 33 can be arranged with the swing axis orthogonal to the rotation axis of the hinge 26 that pivotally supports the rear glass 25. When the rear glass 25 is in the fully open position, the grip portion 38a of the auxiliary handle 33 is provided. Is located within the reach of the operator seated on the driver's seat 8a and the operator can easily pull the grip portion 38a toward the driver's seat 8a, the auxiliary handle 33 is attached to the rear glass 25. You may deploy at any position. Along with this, the engaging body 32 can also be arranged at a position such as a midway portion of the rear column 11 forming the rear frame 24.

Further, the rear glass 25 has a rotation shaft that extends in the horizontal direction above the central portion in the vertical direction, and is pivotally supported on the rear frame 24 by pivotally supporting the ends of the rotation shaft on the pair of left and right rear columns 11. On the other hand, it may be openable and closable.
Further, the window glass opening / closing mechanism according to the present invention can be provided in the window glass and its window frame provided in the side window 21 and the side rear frame 19 and the door window 17.
Furthermore, it is needless to say that the window glass opening / closing mechanism according to the present invention can be employed in a cabin window provided in another work vehicle such as a backhoe or a TLB work machine.

It is a principal part side view which shows operation | movement of the rear glass opening / closing mechanism of 1st Embodiment concerning this invention. It is a rear view of a cabin. It is a top view of the auxiliary handle of the rear glass opening / closing mechanism. It is a rear view of the rear glass opening / closing mechanism. It is a principal part side view of this rear glass opening and closing mechanism. It is a principal part side view which shows the state which set the rear glass to the half-opening attitude | position. It is a left view which shows the rear part of a tractor. It is a rear view of the rear glass opening / closing mechanism of 2nd Embodiment concerning this invention. It is a right view of the rear glass opening / closing mechanism.

DESCRIPTION OF SYMBOLS 1 Tractor 6 Cabin 8a Driver's seat 9 Cabin frame body 10 Front strut 11 Rear strut 12 Intermediate strut 13 Upper frame 14 Lower frame 24 Rear frame 25 Rear glass 26 Hinge 27 Damper 28 Weather strip 30 Rear glass opening / closing mechanism 31 Glass opening / closing operation part 32 Engagement body 33 Auxiliary handle 34 Locking means 35 Support body 37 Leg portion 37a Base 38 Connection portion 38a Holding portion 39 Torsion coil spring 41 Lock lever 43 Lock piece 52 Engagement portion 53 Locked portion 63 Auxiliary handle 67 Leg portion 67a Base 68 Connection portion 68a Part

Claims (3)

A window glass (25) is pivotally supported on the window frame (24) of the cabin (6) provided to cover the driver's seat (8a) so as to be openable and closable toward the outside of the cabin (6). ) Is provided with an auxiliary handle (33) for closing the window glass (25) in the open position,
The auxiliary handle (33) is arranged at a position where the operator's hand seated in the driver's seat (8a) can reach even when the gripping portion (38a) at the front end has the window glass (25) fully open. The base (37a) is pivotally supported between a posture in which the grip portion (38a) is aligned with the window glass (25) and a posture in which the grip portion (38a) is protruded toward the driver seat (8a). The window frame (24) is provided with an engagement body (32) that engages with the grip portion (38a) when the window glass (25) is set in a half-open position, and the inner surface of the window glass (25). Is provided with a support (35) for supporting the base (37a) of the auxiliary handle (33),
The auxiliary handle (33) is wound around the base (37a) with a torsion coil spring (39) biased in a posture along the window glass (25) in a state where the engagement with the engagement body (32) is released. A window glass opening and closing mechanism characterized by A window glass (25) is pivotally supported on the window frame (24) of the cabin (6) provided to cover the driver's seat (8a) so as to be openable and closable toward the outside of the cabin (6). ) Is provided with an auxiliary handle (63) for closing the window glass (25) in the open position,
The auxiliary handle (63) is disposed at a position where the operator's hand seated in the driver's seat (8a) can reach even when the gripping portion (68a) at the front end has the window glass (25) in the fully open position. Each base part (67a, 67b) pivots between a posture in which the grip portion (68a) is aligned with the window glass (25) and a posture in which the grip portion (68a) is protruded toward the driver seat (8a). The window frame (24) is provided with an engagement body (32) that engages with the grip portion (68a) when the window glass (25) is set to a half-open position, and the window glass (25 ) Is provided with a support (35) for supporting the bases (67a, 67b) of the auxiliary handle (63),
The auxiliary handle (63) is disengaged from the engaging body (32) and is placed along the window glass (25) so that the auxiliary handle (63) is positioned along the window glass (25). in order to urge the said respective base (67a, 67b) window glass closing mechanism you characterized in that it is pivotally supported by shifting the up and down. The support (35) supports a lock lever (41) of a lock means (34) for locking the window glass (25) in a closed position,
The engagement body (32) of the window frame (24) includes an engagement portion (52) that engages with a grip portion (38a) of the auxiliary handle (33), and a lock formed on the lock lever (41). The window glass opening / closing mechanism according to claim 1 or 2, wherein a locked portion (53) engaged with the piece (43) is formed.

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