JPH0687456U - Window opener - Google Patents

Abstract

(57) [Summary] [Structure] A windshield 2 provided in the window of the cabin 1 is fitted with a first engaging element 6 that engages with a first rail 4 provided on the side of the ceiling, and the windshield is also attached. The second engaging element 7 that engages with the second rail 5 provided on the side of the window is attached to the lower part of the. A slider 11 connected to a second engaging member via a connecting means 12 such as a cable is engaged with the first rail, and a nut 10 advanced and retracted by a screw shaft 8 inserted in the first rail 4 is attached to the first engaging member. And the slider can be selectively combined. During the shield opening operation, the coupling partner of the nut is switched from the first engaging element to the slider, and it is difficult to pull up the second engaging element due to the pulling of the first engaging element. Drive the goko upwards. [Effect] The windshield can be opened without forcing the drive source.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a window opening / closing device mainly applied to a construction machine such as a crane or a power shovel, which opens upward by pulling a windshield provided in a window portion of a cabin into a ceiling portion of the cabin by power from a drive source.

[0002]

[Prior art]

 Conventionally, as this type of device, a first engaging element that engages with a first guide rail provided on a side portion of a ceiling portion is attached to an upper portion of a windshield, and is provided on a side portion of a window portion at a lower portion of the windshield. A second engaging element that engages with the second guide rail is attached, a screw shaft that is connected to the drive source is provided along the first guide rail, and a nut that is screwed onto the screw shaft is attached to the first engaging element. However, it is known that the first shield is moved by the rotation of the screw shaft by the drive source to open and close the windshield.

[0003]

[Problems to be solved by the device]

 In the above, when the windshield gradually tilts to the horizontal posture due to the movement of the first engaging element in the retracting direction of the windshield, the horizontal component force of the traction force acting on the second engaging element via the windshield is generated. As a result, the vertical component force that pulls up the second engaging element decreases, and the first engaging element has to be pulled more strongly to pull up the second engaging element. The sudden increase in the latter half of the opening operation of the drive makes it difficult for the drive source.

In view of the above points, an object of the present invention is to provide a device capable of opening a windshield with a load as low as possible.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is an apparatus for opening a windshield provided in a window portion of a cabin upward by pulling it into a ceiling portion of the cabin by power from a driving source. A first engaging element that engages with a first guide rail provided on the window portion, and a second engaging element that engages with a second guide rail provided on a side portion of the window is attached to the lower portion of the windshield, A screw shaft connected to the drive source is provided along one guide rail of the guide rail and the second guide rail, and a nut is screwed onto the screw shaft. A slider, which is connected to the other engaging member that engages with the guide rail and is not screwed with the screw shaft, is connected to the other engaging member that engages with the one guide rail and the slider. Na While the windshield is being opened, the coupling partner of the nut is switched from the one engaging element to the slider when the one engaging element is the first engaging element. When one of the engaging elements is the second engaging element, switching means for switching from the slider to the one engaging element is provided.

[0006]

[Action]

 The operation of the present invention will be described by taking the case where one of the engaging elements is the first engaging element as an example. The nut is connected to the first engaging element and the first engaging element is driven until the windshield is opened. However, the nut is coupled to the slider in the latter half of the opening operation in which it becomes difficult to pull up the second engaging element due to the pulling of the first engaging element, and the nut is driven to the second engaging element that is coupled to the slider through the coupling means. The force is transmitted and the load on the drive source is reduced as much as possible.

[0007]

【Example】

 Referring to FIG. 1, reference numeral 1 is a cabin of a construction machine such as a power shovel, 2 is a windshield provided in a front window portion of the cabin 1, 3 is a side frame of the cabin 1, which is located on a side portion of a ceiling portion. As shown in FIG. 2, the first guide rail 4 which is long in the front-rear direction is attached to the roof side rail portion 3a of the side frame 3, and the front pillar portion 3b of the side frame 3 located on the side portion of the window is attached to the roof side rail portion 3a. As shown in FIG. 3, a second guide rail 5 which is long in the vertical direction is integrally formed, and the first engaging element 6 is pivotally attached to the upper end of the side edge portion of the windshield 2 via a stay 2a. A roller-shaped second engaging element 7 is pivotally attached to the lower end of the side edge portion of the shield 2, and the first engaging element 6 and the second engaging element 7 are engaged with the first guide rail 4 and the second guide rail 5, respectively. Let the wind seal And adapted to open upwardly while retracted from the front 2 of the ceiling.

A screw shaft 8 is inserted in the front and rear ends of the first guide rail 4, and the screw shaft 8 is connected to a drive source (not shown) via a gear box 9 and The nut 10 is screwed onto the shaft 8 so that the nut 10 can be moved back and forth by the rotation of the screw shaft 8 by the drive source.

Further, a push-pull cable that is positioned behind the first engaging element 6 on the first guide rail 4 and engages the slider 11 and extends through the first guide rail 4 to the second guide rail 5 through the slider 11. 12 are connected, hooks 12a engaged with the guide grooves 5a in the second guide rail 5 are attached to the tip of the cable 12, and the slider 11 is moved rearward as shown in FIGS. According to the above, the hook 12a comes into contact with the shaft portion 7a of the second engaging element 7 from below and the second engaging element 7 is pushed up along the second guide rail 5.

The nut 10 is configured so that it can be selectively coupled to the first engaging element 6 and the slider 11, and the coupling partner of the nut 10 is connected to the first engaging element 6 during the opening operation of the windshield 2. A switching means for switching from the slider 11 to the slider 11 is provided, and the nut 10 is coupled to the first engaging element 6 to drive the first engaging element 6 rearward until the middle of the opening operation. In the latter half of the opening operation, the nut 10 is moved to the slider 11. And the second engaging element 7 is driven upward via the push-pull cable 12.

This will be described in detail with reference to FIG. 5. The first engaging element 6 is formed in a tubular shape, and the nut 10 can be inserted into and removed from the first engaging element 6, and the nut 10 has an upper surface and a lower surface, respectively. The first and second lock grooves 13 and 14 are formed, and the first and second lock pieces 15 and 16 are attached to the upper wall portion of the first engaging element 6 and the front end of the slider 11, respectively. 13 is fitted with the first lock piece 15 or the second lock groove 14 is fitted with the second lock piece 16, so that the nut 10 can be selectively coupled to the first engaging element 6 and the slider 11. .

Here, the first lock piece 15 is urged upward by a spring 15 a, and the second lock piece 16 is attached to a forward leaf spring 16 a provided at the front end of the slider 11 and urged downward. A lock hole 17 is formed in the lower wall portion of the first guide rail 4 by being located in the rear half of the first guide rail 5, and the second lock piece 16 is normally provided as shown in FIG. 5 (a). Fits into the lock hole 17 so that the slider 11 is stopped at a predetermined standby position, and the clearance groove that matches the moving track of the first lock piece 15 is formed on the inner surface of the upper wall portion of the first guide rail 4. 18 is formed in the relief groove 18 from the front end of the first guide rail 5 to the standby position, and the pressing bar 18a is embedded until the nut 10 retracts to the standby position. 13 is pushed down and the first lock groove 1 The first engaging element 6 is coupled to the nut 10 so that the first engaging element 6 is driven rearward. Then, when the nut 10 contacts the slider 11 and the slider 11 is retracted from the standby position, the second lock piece 16 is pulled out from the lock hole 17 as shown in FIG. 14, the first lock piece 15 is disengaged from the presser bar 18a and moved upward in the escape groove 18 to be disengaged from the first lock groove 13, and the mating partner of the nut 10 moves from the first engaging element 6 to the slider. I was able to switch to 11.

It should be noted that the guide groove 5a is so arranged that the shaft portion 7a of the second engaging element 7 that is pulled up as the first engaging element 6 is driven rearward does not interfere with the hook 12a at the tip of the push-pull cable 12. The lower end portion of the slider is offset to the side of the moving path of the shaft portion 7a as shown in FIG. 4, and the nut 10 abuts the slider 11 at the standby position to the switching position shown in FIG. 5 (b). The hook 12a ascends from the lower end of the guide groove 5a and abuts the shaft portion 7a of the second engaging element 7 from below until the nut 11 is retracted. The second engaging element 7 is driven upward via the hook 12a. Here, in the latter half of the opening operation of the windshield 2, the retracting speed of the first engaging element 6 becomes slower than the ascending speed of the second engaging element 7, and in this case, the ascending speed of the second engaging element 7 is Since it is equal to the retreat speed of, the nut 10 comes out behind the first engaging element 6 as shown in FIG.

By the way, when only the first engaging element 6 is driven to open the windshield 2, the load sharply increases as indicated by line a in FIG. 6 in the latter half of the opening operation, whereas the second engaging element 7 is opened. When the windshield 2 is opened by driving only the load, the load gradually decreases as the opening degree increases as shown by the line b in FIG. 6, and the above-mentioned operation is performed during the opening operation where the line a and the line b intersect. Thus, by switching the coupling partner of the nut 10 from the first engaging element 6 to the slider 11, the load on the drive source can be reduced as much as possible.

In the above embodiment, the lock pieces 15 and 16 attached to the first engaging element 6 and the slider 11 are engaged with and disengaged from the nut 10 to switch the connection, but the first engaging element is attached to the nut. And a swinging piece having hooks at both ends with respect to the slider are pivotally attached, and the swinging piece is swung by a cam formed on the first guide rail so that the hooking portion corresponding to one of the first engaging element and the slider is formed. You may make it engage and switch the coupling partner of a nut.

Further, although the screw shaft 8 is provided along the first guide rail 4 in the above embodiment, the screw shaft, the nut screwed with the screw shaft, and the first engaging element 6 are provided on the second guide rail 5 side. Is provided with a slider connected via a connecting means, and the nut is connected to the slider to drive the first engaging element 6 until the middle of the opening operation, and then the nut is connected to the second engaging element 7. The second engagement element 7 may be driven.

[0017]

[Effect of device]

 As is apparent from the above description, according to the present invention, the load applied to the drive source is changed from the state in which the first engaging element is driven to the state in which the second engaging element is driven during the opening operation of the windshield. Since the driving of the engaging element that engages with the other guide rail without the screw shaft is performed through the slider that engages with the one guide rail, the engagement with the other guide rail side is possible. Since it is not necessary to provide a drive mechanism for driving the alloy, it has the effect of simplifying the structure.

[Brief description of drawings]

FIG. 1 is a side view of an example of the proposed device.

2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV of FIG.

5 (a), (b) and (c) are side cutaway views of essential parts for explaining the operation at the time of switching the coupling partner of the nut.

FIG. 6 is a graph showing changes in load when the windshield is opened.

[Explanation of symbols]

1 Cabin 2 Windshield 4 1st guide rail 5 2nd guide rail 6 1st engaging element 7 2nd engaging element 8 Screw shaft 10 Nut 11 Slider 12 Push pull cable (connecting means) 13, 14 Lock groove 15, 16 Lock piece 17 Lock hole 18 Relief groove 18a Presser bar

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kota Hotta 1150-6 Ujiie, Ujiie-cho, Shioya-gun, Tochigi Yachiyo Industry Co., Ltd. Tochigi Technology Center

Claims (1)

[Scope of utility model registration request] 1. A device for opening a windshield provided in a window portion of a cabin upward by pulling it into a ceiling portion of the cabin by power from a drive source, the first guide provided on a side portion of the ceiling portion above the windshield. A first engaging element that engages with the rail is attached, and a second engaging element that engages with a second guide rail provided on the side of the window is attached to the lower part of the windshield, and the first guide rail and the second guide rail are attached. One of the guide rails is provided with a screw shaft connected to the drive source, a nut is screwed onto the screw shaft, and the other guide rail is engaged with the other guide rail. Of the slider, which is coupled to the engaging member of the second embodiment through the connecting means and is not screwed to the screw shaft, and the nut can be selectively coupled to the one engaging member and the slider that engage with the one guide rail. Tosu In addition, when the one of the engaging elements is the first engaging element, the one of the engaging elements is switched to the slider when the one of the engaging elements is the first engaging element during the opening operation of the windshield, and the one of the engaging elements is the second engaging element. When the above condition is satisfied, the window opening / closing device is provided with a switching means for switching from the slider to the one engaging element.