JPH0618997Y2 - Screw type multi-stage telescopic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a screw type multi-stage expanding / contracting device capable of linearly displacing a driven body by expanding / contracting a screw mechanism.

(Prior Art) As a conventional telescopic device, there are a telescopic device that pulls and releases a wire rope to perform a telescopic operation, and a hydraulic cylinder that expands and contracts by supplying and discharging pressure oil.

(Problems to be solved by the invention) The former one can have a simple structure, but has problems in increasing the output, life resistance, and extruding function, and the latter one. However, it is difficult to accurately control the amount of expansion and contraction displacement, and there is also the problem of contamination due to oil leakage.

The present invention has been made in view of the above problems, and an object thereof is to provide a screw type multi-stage telescopic device which is excellent in high output, robustness, accurate control of expansion and contraction displacement amount, prevention of contamination by oil, and the like. To do.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a driving cylinder pivotally installed in the cylindrical frame via a bearing provided on the inner proximal end side of the cylindrical frame. The input shaft is extended from the center of the base end face, and a multi-tube type screw cylinder screwed into the inside of the driving cylinder is screwed together, and an output screw shaft is also inside the screw cylinder. While being screwed, an innermost cover cylinder slidably fitted on the driving cylinder is integrally coupled with the screw shaft,
In addition, the innermost cover cylinder and the cylinder frame are connected to each other by a multi-tube slide cover cylinder so as to be expandable and contractible.

(Operation) When power is transmitted from the outside, the input shaft rotates, and the rotation of the input shaft causes the driving cylinder and the screw cylinder to rotate with respect to the output screw shaft.

As a result, the driving cylinder, the screw cylinder, and the output screw shaft perform expansion and contraction displacement of their entire length by the screw action of each screw portion.

On the other hand, the driving cylinder, the screw cylinder and the output screw shaft are kept covered by the cylinder frame, the multi-tube slide cover cylinder and the driving cylinder even during the expansion and contraction process.

(Example) Hereinafter, a specific example of the present invention will be described in detail.

FIG. 1 is a sectional view showing a reduced state of the device of the present invention, and FIG. 2 is a sectional view showing an expanded state of the device.

In the figure, reference numeral 1 denotes a cylindrical frame having a closed base end surface 1a, which releases the front end surface, forms a sliding contact collar 1b also serving as a stopper on the peripheral edge of the front end surface, and a fixing member on the outer surface of the base end surface 1a. 1c is attached. A bearing 3 composed of two ball bearings 2 is provided on the inner proximal side of the tubular frame 1.
Is provided, and the driving cylinder 4 is pivotally mounted at a fixed position by interposing the bearing 3. The driving cylinder 4 is closed at its base end surface 4a, and an input shaft 5 is provided from the center of the surface concentrically with the central axis of the driving cylinder 4 and is formed on the base end surface 1a of the cylinder frame 1. It is extended to the outside through the through hole 6. Reference numeral 4b denotes an inner screw formed on the inner peripheral surface of the tip of the driving cylinder 4. Power is transmitted to the input shaft 5 from a prime mover (not shown) via an appropriate transmission means such as a worm gear 7.

Reference numeral 8 is a multi-tube type screw cylinder in which screw cylinder elements 9 are screwed together, and each screw cylinder element 9 has an external thread 9 on its entire outer peripheral surface.
a is formed, and an inner screw 9b is formed at a front end of the inner peripheral surface by a predetermined length, and retaining collars 9c, 9c are formed on both end edges of the outer peripheral surface. The retaining collar 9
One of c and 9c also functions as a sliding contact color. Then, the screw cylinder 8 is screwed into the inside of the driving cylinder 4 via the outer screw 9a formed on the outer peripheral surface of the outermost screw cylinder element 9. Reference numeral 9d is a sliding contact plate attached to the innermost screw cylinder element 9.

An output screw shaft 10 is screwed into an inner screw 9b of a screw cylinder element 9 located at the innermost side of the screw cylinder 8. The screw shaft 10 is formed with a sliding contact collar 10a also serving as a retainer at the base end portion thereof, and the tip end portion thereof is an innermost cover cylinder 11 described below.
It is integrally connected to.

The innermost cover cylinder 11 is slidably displaceably fitted onto the driving cylinder 4, its front end surface is closed, and a coupling element 11a having a through hole is attached to the front surface thereof, and the base end of the peripheral surface thereof. A sliding contact collar 11b, which also serves as a stopper, is formed on the edge in the radial direction.

The innermost cover tube 11 and the tube frame 1 are connected to each other via a multi-tube slide cover tube 12 so as to be expandable and contractible. Here, the multi-tube slide cover cylinder 12 is formed by fitting a plurality of slide cover cylinders 13 ... In a multi-tube manner. Each slide cover tube 13 is formed with appropriate sliding retaining collars 13a, 13b at both end edges of the peripheral surface in the radial direction, and each slide cover tube 13 is freely expandable and contractable while maintaining dustproof performance in relation to each other. I'm giving it what I get. It is also possible to provide the multi-tube slide cover tube 12 with waterproof performance by attaching packings to the sliding contact surfaces of the sliding contact collars 13a and 13b that also function as stoppers.

When using the above-described device of the present invention, for example, the fixing member 1
c is fixed on the stationary side and the coupling element is connected to the driven body.

Then, the operation is performed as follows. That is, the normal rotation of a prime mover (not shown in FIG. 1) causes the rotation to be transmitted to the prime mover 4 via the input shaft 5 and the prime mover 4 and the screw cylinder 12.
And rotate the output screw shaft relative to each other. Due to the screw action by the rotation, the output screw shaft 10 is displaced toward the tip end side thereof at a predetermined speed in proportion to the rotation speed of the input shaft 5 while maintaining the non-rotation state. On the other hand, the advancing displacement causes an advancing displacement of the innermost cover cylinder 11, which causes the slide cover cylinders 13 of the multi-tube slide cover cylinder 12 to slide and displace, and the multi-tube slide cover cylinder 12 maintains the dustproof function. It will be extended and displaced. Thus, when the output screw shaft 10 advances to the maximum, the state shown in FIG. 2 is obtained.

In this state, when the motor (not shown) is rotated in the reverse direction, the output screw shaft 10 moves toward the base end of the multi-tube slide cover cylinder 12 toward the base end thereof at a predetermined speed in proportion to the rotation speed of the input shaft 4. Move backward with. Then output screw shaft 1
When 0 retreats to the maximum, it returns to the state of FIG.

In the above embodiment, the screw cylinder element 9 and the slide cover cylinder 13 which constitute the screw cylinder 8 are three in number, but the number can be appropriately set according to the maximum expansion and contraction displacement amount of the device of the present invention.

(Effect of the Invention) As described above, according to the present invention, since the screw cylinder 8 or the like is configured to expand and contract to be displaced, it is possible to make it more robust than a wire rope or the like. The rotation control of the input shaft 5 makes it possible to perform a smooth, reliable and accurate expansion / contraction displacement, and since the multi-tube slide cover cylinder 12 has a dustproof effect, it can sufficiently withstand use in dust. Since hydraulic oil is not used unlike hydraulic cylinders, there is no need to worry about oil contamination.

Further, the structure including the screw cylinder 8 and the multi-tube slide cover cylinder 12 has an arbitrary planned expansion and contraction without changing the overall length of the apparatus by increasing or decreasing the number of screw cylinder elements 9 ... and slide cover cylinders 13 ... It is possible to correspond to the amount of displacement.

[Brief description of drawings]

FIG. 1 is a sectional view showing a reduced state of the device of the present invention, and FIG. 2 is a sectional view showing an expanded state of the device. 1 ... Cylinder frame, 3 ... Bearing, 4 ... Driving cylinder, 4a ...
… Proximal end face, 5 …… Input shaft, 8 …… Screw cylinder, 10 …… Screw shaft for output, 11 …… Innermost cover cylinder, 12 …… Multi-tube slide cover cylinder.

Claims (1)

[Scope of utility model registration request] 1. A driving cylinder (4) is pivotally provided in the cylindrical frame (1) via a bearing (3) provided on the inner proximal side of the cylindrical frame (1), and the driving cylinder (4). The input shaft (5) is extended from the center of the base end face (4a), and a multi-tube type screw tube (8) screwed with each other is installed inside the driving tube (4). Further, while the output screw shaft (10) is screwed into the central portion of the screw cylinder, the sliding contact collar (11b) also serves as a retainer at the base end with respect to the outer periphery of the driving cylinder (4) in the radial direction. The innermost cover cylinder (11a), which is slidably displaceably fitted to the front end of the screw shaft (10), is integrally connected to the innermost cover cylinder, and a multi-tube slide is provided between the innermost cover cylinder and the cylinder frame. A cover cylinder (12) is provided, and each slide cover cylinder (13) has a sliding contact collar (1
3a) and (13b) are formed in the radial direction and are connected so as to be expandable and contractible, and a screw type multi-stage expander / contractor.