JP2553627Y2 - Driving device for sliding body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a sliding body mainly applied to a window opening / closing device.

[0002]

2. Description of the Related Art Conventionally, as a window opening / closing device for a construction machine such as a crane or a power shovel, a windshield mounted on a window on the front of a cabin is drawn into a ceiling of the cabin so as to be opened upward. A first guide rail elongated in the front-rear direction is provided on the side of the window, and a second guide rail elongated in the up-down direction is provided on the side of the window, and a first guide rail is provided at an upper end and a lower end of a side edge of the windshield, respectively. Slider and second
The first slider and the second slider are slidably engaged with the first guide rail and the second guide rail, respectively, while being pivotally connected to the slider, and the first slider is slidably engaged with the first guide rail along the first guide rail. A screw rod to be screwed is provided, the screw rod is rotated by a driving source to drive the first slider rearward along the first guide rail, and the windshield is pulled up along the second guide rail to raise the windshield. There is known one that is drawn into a ceiling. However, in this case, as the windshield tilts to a horizontal position when retracted into the ceiling, the vertical component of the traction force of the first slider acting on the second slider via the windshield decreases, and the second slider And the load on the drive source suddenly increases in the latter half of the opening operation of the windshield.

In order to solve such a problem, the present applicant has previously proposed the following apparatus. The device, as shown in FIG. 1, pivoting the first rotary shaft 3 ₁ that is inserted through the first slider 2 ₁ which is pivotally mounted on the side edge upper end of the windshield 1, the lower side edge portion of the windshield 1 a second and a rotating shaft 3 ₂ which is second insertion slider 2 ₂ who wears, the output shaft 4 of the driving source 4
two rotating shafts by to a drive source 4 connected to the first rotary shaft 3 ₁ to the second rotary shaft 3 ₂ via the gearbox 5 ₂ with the a is connected to the first rotary shaft 3 ₁ through the gearbox 5 ₁ 3 ₁ and 3 ₂ can be rotated in conjunction with each other, and the first rotating shaft 3
A threaded portion 3a to be screwed into the first nut mounted on the slider 2 ₁ in the first half of the _1, a screw portion 3b is screwed into a nut attached to the second slider 2 ₂ Second upper half of the rotary shaft 3 ₂ forming the door, the first half of the opening operation of the windshield 1 is driven in the rearward of the first slider 2 ₁ at the first rotary shaft 3 ₁ of the screw portion 3a,
Second half portion and the second slider 2 ₂ of the second rotary shaft 3 _second threaded portion 3b
To drive upward.

[0004]

[Problem to be solved by the invention]
When the first slider 2 ₁ of the nut is disconnected from the first rotary shaft 3 ₁ of the screw portion 3a before threaded portion 3b of the slider 2 to ₂ of the nut second rotary shaft 3 ₂ are screwed further windshield 1
The will not be able to open, so that the second slider 2 ₂ is the first
The second rotary shaft to the second slider 2 ₂ nuts in a state of being forcibly promoted and by driving the slider 2 ₁ 3 ₂ threaded section 3
b must be screwed, but if the base end of the screw portion 3b is out of phase with the nut just before the nut abuts the base end of the screw portion 3b, the second rotary shaft after the abutment 3 ₂ is 1
Threaded portion 3b until the rotation is not combined with the nut, while the second rider 2 ₂ mobile increases the driving load of the windshield 1 is restrained, the first drive switching from the slider 2 ₁ to the second slider 2 ₂ Cannot be performed smoothly. Such a defect is caused by a predetermined stroke of the driven object by a suitable means such as a cylinder or the like, and then, for final positioning of the driven object, a threaded member formed on a rotary shaft of a sliding body connected to the driven object. This also occurs when driving is performed. SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an apparatus that can smoothly switch to a state in which a sliding body is driven by a screw formed on a rotating shaft.

[0005]

In order to achieve the above object,
In the present invention, a nut is attached to a sliding body, a rotary shaft is inserted through the nut, and a screw portion for screwing to the nut is formed in a part of the rotating shaft, and the sliding body is rotated while the rotating shaft is rotated. In a device in which the sliding body is driven via the nut by the screw portion when the nut is propelled to the position where the nut starts to be screwed into the screw portion, the number of threads of the nut is made larger than the number of threads of the screw portion. Features.

[0006]

For example, if the screw portion is a single-thread screw and the nut is a double-thread screw, the chance that the screw portion is screwed to the nut is one of the rotation shafts.
Appears twice in rotation. In this way, since the chance of screwing of the screw portion increases, the screw portion is quickly screwed into the nut after the nut abuts on the base end of the screw portion, and the sliding body is smoothly cut into a state driven by the screw portion. Be replaced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to the window opening and closing device shown in FIG. 1 will be described below. Figures 2 and 3 shows a second structure of the slider 2 ₂ which is pivotally connected to the side edges the lower end of the windshield 1, the slider 2 ₂ cylindrical portion 2a formed by bending a single plate material A stay in which both end portions of the plate material are bent and overlapped with an abutment portion 2b projecting outward from the cylindrical portion 2a, and the overlap portion 2c is provided at the lower end of the side edge of the windshield 1 to protrude. Pin 2 on 1a
d.

Further, the second slider 2 ₂ is slidably engaged in the cylindrical part 2a in the lengthwise of the guide rail 7 in the vertical direction is attached to the side frame 6 of the window of the cabin, the cylindrical portion The nut 8 is housed in the nut 2a, and the second rotating shaft 3 is
₂ was inserted.

The nut 8 is slidably housed in the cylindrical portion 2a with a projection 8a projecting from the outer periphery thereof being engaged with the abutment portion 2b to prevent rotation. Part 2
The spring 8b is housed in the lower part of the frame a, and the nut 8 is urged upward. Note that the nut 8 is prevented from falling off by an inner bending flange 2e formed at the upper end of the cylindrical portion 2a.
The spring 8b has an inner bending flange 2 formed at the lower end of the cylindrical portion 2a.
received at f. Referring to FIG. 1, it is rotated first rotary shaft 3 ₁ and the second rotary shaft 3 ₂ Start drive source 4,
First the first slider 2 ₁ via a nut screwed to the screw portion 3a formed in the first half portion of the rotary shaft 3 ₁ is driven backwards, windshield 1 is drawn from the front to the ceiling. At this time, the second slider 2 ₂ is pulled along the guide rails 7 by a first thrust of the slider 2 ₁ acting through the windshield 1, reaches near the rear end of the first slider 2 ₁ threaded portion 3a 2nd slider 2 ₁
Nut 8 abuts against the lower end of the threaded portion 3b formed in the upper half of the second rotary shaft 3 _2. At this time, the nut 8 has a threaded portion 3b
There until screwed constrained movement of the nut 8, the spring 8b with the second pulling of the slider 2 ₂ according to the first slider 2 ₁ thrust is compressed, the windshield 1 by the compression reaction force of the spring 8b The driving load increases.

Here, in this embodiment, as shown in FIG.
The screw portion 3b is formed as a single thread, and the nut 8 is formed with two screw grooves 8 having a phase difference of 180 ° from each other.
c, forming a two start thread having 8d, nut 8 threaded second rotating shaft from contact with the lower end of the portion 3b 3 ₂ is maximum 1/2
If it rotates, the thread of the screw part 3b will be
The screw was started to be screwed into one of c and 8d. According to this, the nut 8 is not compressed before the spring 8b is compressed to the left.
Constraints are solved, the increase in the driving load of the windshield 1 is kept small, smooth drive switching from the first slider 2 ₁ to the second slider 2 ₂ is performed.

[0011] Incidentally, when closing the windshield 1 by reversing the rotation shaft 3 _1, 3 _2, the second slider 2 ₂ are driven downwardly First, in a state of receiving thrust from the second slider 2 ₂ first slider 2 ₁ of the nut abuts the rear end of the first rotary shaft 3 ₁ of the threaded portion 3a. Therefore, it is desirable to increase the screws Article number of threaded portion 3a from the screw Article number of the first slider 2 ₁ of the nut.

Although the embodiment in which the device of the present invention is applied to a window opening / closing device has been described above, in the device of the present invention, the nut of the sliding member is screwed into the screw portion of the rotary shaft while the sliding member is being propelled by another means. It can be widely applied to devices that are combined.

[0013]

As is apparent from the above description, according to the present invention, the screw of the rotary shaft is quickly screwed into the nut of the sliding body while the sliding body is being propelled by another means. Thus, it is possible to smoothly switch from driving by another means to driving by the screw portion.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a drive mechanism of a window opening / closing device to which the present invention is applied.

FIG. 2 is a cutaway plan view of the main part.

FIG. 3 is an enlarged cut-away side view of the second slider as viewed from the line III-III in FIG. 2;

[Explanation of symbols]

2 ₂ Slider (sliding body) 3 ₂ Rotary shaft 3b Thread 8 Nut 8c, 8d Double thread groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A nut is attached to a sliding body, a rotary shaft is inserted through the nut, and a screw portion for screwing to the nut is formed in a part of the rotary shaft. In a device in which the nut is propelled to a position where the nut starts to be screwed into the screw portion, the sliding member is driven by the screw portion via the nut, and the number of threads of the nut is larger than the number of threads of the screw portion. A driving device for a sliding body, characterized in that: