JP6969833B1 - Telescopic cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopic cover capable of making the left-right width of a cover body more compact while maintaining a moving stroke while using a pair of left and right tension springs. SOLUTION: A telescopic cover is configured by combining a plurality of cover members 1a to 1c in a nested manner so as to be expandable and contractible in the front-rear direction X. The cover member 1 is a cover main body 2 and a telescopic cover in the cover main body 2. A pair of left and right rotating arms 8 and 8 are attached to one end wall portion 4 of the adjacent end wall portions 4 and 4 provided with an end wall portion 4 formed at one end portion in the front-rear direction X. A pair of left and right rotating arms 8 and 8 are arranged between the end wall portions 4 and 4 of the adjacent cover main body 2 in the telescopic cover contracted state, and a pair of left and right first tension springs 6 and 6 are arranged. The first tension springs 6 and 6 have a configuration in which the left-right central side end portion is connected to the tip end portion of the rotating arm 8 and the outer end portion is connected to the other end wall portion 4. [Selection diagram] Fig. 1

Description

The present invention relates to a telescopic cover that protects a sliding surface of a machine tool from metal powder, dust, etc. by expanding and contracting with the movement of the machine tool.

Conventionally, a telescopic cover has been used to protect a sliding surface, a spindle, and an internal device of a machine tool from chips, dust, and the like. The telescopic cover is composed of a plurality of cover members having different sizes in a nested manner. When the telescopic cover is extended and contracted, the adjacent cover members collide with each other, causing problems such as noise and damage to the cover member. In particular, with the recent increase in the speed of machine tools, the above problems have become more prominent.

In order to solve such a problem, in the previous application (Patent Document 1), the applicant has arranged a pair of left and right tension springs between the end wall portions of the adjacent cover bodies in the telescopic cover contracted state, and the pair of left and right tension springs. The tension spring is a telescopic cover having a configuration in which the central end in the left-right direction is connected to one of the adjacent end walls and the outer end in the left-right direction is the other end wall or the connected end. Proposed. This makes it possible to suppress the occurrence of collision noise and breakage of the cover member without making the structure simple and increasing the size of the device.

Japanese Patent No. 6798742

However, in the telescopic cover having the above configuration, a pair of left and right tension springs are arranged between the end wall portions of the adjacent cover bodies in the telescopic cover contracted state. Therefore, in order to increase the movement stroke of the cover body in the front-rear direction (hereinafter, abbreviated as "movement stroke") when the telescopic cover expands and contracts, it is necessary to lengthen the tension spring, and pull it to the left and right of the cover body. It was necessary to increase the width.

In other words, in order to increase the movement stroke, it is necessary to increase the left-right width of the cover body accordingly. However, depending on the installation location of the telescopic cover, the left-right width of the cover body may not be large, and it has been required to make the left-right width of the cover body more compact while maintaining the moving stroke.

Therefore, in view of the above problems, in the present invention, a pair of left and right tension springs are used to suppress the occurrence of collision noise and breakage of the cover member, and the left and right width of the cover body is made more compact while maintaining the moving stroke. The purpose is to provide a telescopic cover capable of.

In order to achieve the above object, one aspect of the present invention is a telescopic cover configured by combining a plurality of cover members in a nested manner so as to be expandable and contractible in the front-rear direction. The cover body is provided with an end wall portion formed at one end portion in the front-rear direction of the telescopic cover, and a pair of left and right rotations that can be rotated in the horizontal direction on one end wall portion of the adjacent end wall portions. A moving arm is attached, and the pair of left and right rotating arms are arranged between the end walls of the adjacent cover bodies in the telescopic cover contracted state in the initial posture with the tip side of the arm facing the center side in the left-right direction, and left and right. A pair of first tension springs are arranged, and the pair of left and right first tension springs are connected to the tip ends of the rotation arms whose ends on the center side in the left and right directions are arranged on the same side in the left and right directions, respectively, in the left and right directions. A telescopic cover is provided in which the outer end is connected to the other end wall.

An elastic member may be provided to provide a restoring force for returning the rotating arm to the initial posture when the tip end side of the rotating arm rotates in the front-rear direction.

The rotating arm includes an arm portion to which the first tension spring is connected to the tip portion and a shaft portion provided in the middle of the arm portion, and is an end wall portion of a cover body adjacent to the telescopic cover in a contracted state. A pair of left and right second tension springs are arranged between the elastic members, and the pair of left and right second tension springs are rear of the arm portion in which the ends on the center side in the left and right directions are arranged on the same side in the left and right directions. A configuration may be configured in which the end portion is connected to the end portion and the outer end portion in the left-right direction is connected to the one end wall portion.

The rotating arm satisfies the relationship of X> Y when the distance from the tip of the arm portion to the shaft portion is X and the distance from the rear end of the arm portion to the shaft portion is Y. May be.

According to one aspect of the present invention, since the first tension spring to which the rotating arm is connected is folded and arranged between the end wall portions of the adjacent cover main body in the telescopic cover contracted state, it rotates when the telescopic cover is extended. The movement stroke can be increased by the amount that the arm rotates in the front-rear direction. Therefore, it is possible to suppress the occurrence of collision noise and breakage of the cover member by using a pair of left and right tension springs, and to make the left and right width of the cover body more compact while maintaining the moving stroke.

Top view showing the extended state of the telescopic cover of this embodiment Top view showing a state in which the telescopic cover of FIG. 1 is half contracted. A plan view showing a state in which the telescopic cover of FIG. 1 is contracted. Partially enlarged view of AA cross section of FIG. Rear view of FIG. Enlarged view showing the unit of FIG. Rear view showing a modified example of the telescopic cover of this embodiment Rear view showing another modification of the telescopic cover of this embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a state in which the telescopic cover is extended in the present embodiment, FIG. 2 is a plan view showing a state in which the telescopic cover is half-extended, and FIG. 3 is a sectional view taken along the line AA of FIG. , FIG. 4 is a plan view showing a state in which the telescopic cover is contracted. Note that FIGS. 1, 2 and 4 show a state in which the top plate portion of each cover member is removed. FIG. 5 is a rear view of FIG.

As shown in the figure, the telescopic cover of the present embodiment is nested by combining a plurality of cover members 1a to 1c having different sizes in sequence (hereinafter, when the cover member in general is described, it is described as "cover member 1"). It is configured to be expandable and contractible in the front-back direction X by combining them in a shape. In the figure, X1 indicates the front direction and X2 indicates the rear direction.

The cover member 1 includes a cover main body 2 and an end wall portion 4 formed at one end of the telescopic cover in the front-rear direction X in the cover main body 2. In the present embodiment, the largest cover member 1a is arranged on the front side, and the end wall portion 4 is formed at the front end portion of the cover member 1. The cover main body 2 has a top plate portion 2a and side wall portions 2b and 2b extending downward from both ends of the top plate portion 2a in the left-right direction Y.

In the present embodiment, the smallest cover member 1c is fixed to the machine tool body (not shown), and the largest cover member 1a is connected to the moving part of the machine tool (not shown). Then, the cover members 1a to 1c reciprocate in the front-rear direction X together with the moving portion of the machine tool so as to cover the sliding surface and the spindle of the machine tool (not shown). As a result, the telescopic cover can be smoothly expanded and contracted.

A stopper 5 is provided on one of the adjacent end wall portions 4, 4, and when the telescopic cover contracts, the stopper 5 abuts on the other end wall portion 4, and the end wall portions 4, 4 of the adjacent cover main bodies 1, 1 are provided. A constant space S is formed between them. A pair of first tension springs 6 and 6 are arranged symmetrically in the space S. The first tension spring 6 can be used without particular limitation as long as it elastically deforms within the expansion and contraction range of the telescopic cover. Specifically, a coil spring or a string-shaped or band-shaped rubber-like elastic body can be used. However, it is preferable to use a coil spring from the viewpoint of durability. Hereinafter, in the present embodiment, an embodiment in which a coil spring is used as the first tension spring 6 will be described.

The pair of left and right first tension springs 6, 6 is one end wall of the end wall portions 4, 4 adjacent to the end portion (hereinafter, abbreviated as the center side end portion) 6a located on the center side in the left-right direction. An end portion (hereinafter, abbreviated as an outer end portion) 6b connected to the portion 4 and located outside Y in the left-right direction is connected to the other end wall portion 4. In the present embodiment, of the adjacent end wall portions 4, 4, the central side end portions 6a and 6a are connected to the end wall portion 4 on the rear side (X2 side), and the end wall portions 4 on the front side (X1 side) are connected. The outer ends 6b, 6b are connected. A pair of first support portions 7, 7 are formed so as to project rearward at symmetrical positions on the other end wall portion 4, and outer end portions 6b are connected to the first support portions 7, 7, respectively. ..

The central side end portion 6a of the first tension spring 6 is connected to one (rear side) end wall portion 4 via the rotation arm 8. The rotating arm 8 is provided so as to be rotatable in the horizontal direction around a pair of left and right second support portions 9, 9 which are formed so as to project forward from one (rear side) end wall portion 4. The rotating arm 8 is housed in the space S in the initial posture in which the tip end side of the rotating arm 8 is directed toward the center side in the left-right direction in the telescopic cover contracted state. Then, an elastic member is provided that provides a restoring force for returning the rotating arm to the initial posture when the tip end side of the rotating arm 8 rotates in the front-rear direction X.

In the present embodiment, the rotating arm 8 includes an arm portion 11 to which the first tension spring 6 is connected to the tip end portion, and a shaft portion 12 provided in the middle of the arm portion 11. The shaft portion 12 is attached to the second support portion 9. In the telescopic cover contracted state, a pair of second tension springs 13, 13 are arranged symmetrically in the space S as elastic members.

The pair of left and right second tension springs 13 and 13 are connected to the rear ends of the rotating arms 8 and 8 whose central ends in the left and right directions are arranged on the same side in the left and right directions, and the outer ends in the left and right directions are connected. It is connected to a third support portion 14 formed so as to project forward from one (rear side) end wall portion 4. The third support portion 14 is formed in pairs on the left and right sides of the end wall portion 4, and the outer end portions of the second tension spring 13 arranged on the same side on the left and right sides are connected to each other.

The second tension spring 13 can be used without particular limitation as long as it elastically deforms within the rotation range of the rotation arm 8. Specifically, a coil spring or a string-shaped or band-shaped rubber-like elastic body can be used. However, it is preferable to use a coil spring from the viewpoint of durability. Hereinafter, in this embodiment, a coil spring is used as the second tension spring.

According to the above configuration, when the telescopic cover is extended, the first tension springs 6 and 6 are extended according to the movement of the cover member 1 on the front side (X1 side) of the adjacent cover members 1 and 1. At that time, the rotating arms 8 and 8 rotate due to the tensile force generated in the first tension springs 6 and 6. As the rotating arms 8 and 8 rotate, the second tension springs 13 and 13, which are elastic members, expand, and a restoring force that returns the rotating arms 8 and 8 to the initial posture acts.

That is, the rotating arm 8 rotates to a position where the tensile force of the first tension spring 6 and the restoring force of the second tension spring 13 are balanced. When the telescopic cover contracts, the first tension spring 6 and the second tension spring 13 contract, so that the cover members 1a and 1b move in the X2 direction, and the rotation arm 8 rotates to return to the initial posture. The telescopic cover returns to the contracted state. As described above, in the present invention, even if the length of the first tension spring 6 is short, the moving stroke can be increased by the rotation of the rotating arm 8. In other words, the width of the cover member in the left-right direction Y with respect to the moving stroke can be reduced.

Further, the rotating arm 8 also has a function of suppressing the left and right wobbling (rattling) of the cover member 1. That is, when the spring load of the left and right first tension springs 6 and 6 varies and the left and right tensile forces applied to the rotation arm 8 vary, the rotation arm 8 rotates around the shaft portion 12. The degree of rotation varies according to the variation, and thereby the variation in the left and right tensile force can be absorbed. As a result, it is possible to suppress the left and right wobbling (rattling) of the cover member 1 and to move the cover members 1a to 1c smoothly.

The rotating arm 8 satisfies the relationship of X> Y when the distance from the tip of the arm portion 11 to the shaft portion 12 is X and the distance from the rear end of the arm portion 11 to the shaft portion 12 is Y. Is preferable. When the rotating arm 8 satisfies the relationship of X> Y, if springs of the same material and the same shape (wire diameter, coil diameter, pitch, etc.) are used as the first tension spring 6 and the second tension spring 13, the first tension is used. The length of the spring 6> the length of the second tension spring 13. This makes it possible to save space in the second tension spring 13 in the space S.

FIG. 6 is an enlarged view showing a unit 15 including a first tension spring 6, a rotation arm 8, and a second tension spring 13 in FIG. As shown in the figure, a first locking portion 16 projecting upward is formed at the tip of the rotating arm 8, and a second locking portion 17 projecting downward is formed at the rear end of the rotating arm 8. NS. Then, the first tension spring 6 is connected to the first locking portion 16, and the second tension spring 13 is connected to the second locking portion 17. As a result, the first tension spring 6 and the second tension spring 13 can be separately accommodated in the upper space and the lower space without interfering with each other in the space S.

In the telescopic cover of the present invention, the unit 15 is provided independently on the left and right sides. Therefore, as shown in FIG. 7, the units 15 and 15 can be arranged closer to the outer side in the left-right direction of the cover member 1 to take a large space in the central portion. This makes it possible to make the height of the cover member more compact while avoiding contact with the object B such as a motor.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the present embodiment, the telescopic cover is composed of three cover members 1a, 1b and 1c having different sizes, but it is needless to say that the telescopic cover may be composed of four or more cover members.

Further, although the end wall portion 4 has a continuous plate shape, the end wall portion 4 can accommodate the first tension spring 6, the second tension spring 13, and the rotation arm 8 and can support the stopper 5. If this is the case, the shape is not particularly limited, and the shape may be discontinuous, or the height of the end wall portion 4 in the left-right direction Y (height from the top plate portion 2a to the lower end of the end wall portion 4) as shown in FIG. It is also possible to change and form.

In the present embodiment, the rotation arm 8 has been described in which the arm portion 11 is extended in the front-rear direction of the shaft portion 12 and the second tension spring 13 is connected to the rear end portion of the arm as an elastic member. However, for example, the arm portion 11 may be formed only forward with the shaft portion 12 as the base end portion. In this case, a torsion coil spring may be interposed between the arm portion 11 and the end wall portion 4 as an elastic member so that a restoring force is generated in the torsion coil spring according to the degree of rotation of the rotating arm.

Further, in the present embodiment, the cover member 1c is fixed to the machine tool main body and the cover member 1a is connected to the moving portion of the machine tool, but the present invention is not limited to this, and the cover member 1a is fixed to the machine tool main body. The cover member 1c may be connected to the moving portion of the machine tool. When the cover member 1c is arranged on the front side, the end wall portion 4 is formed at the rear end portion of the cover member 1. Also in this case, of the adjacent end wall portions 4, 4, the central side end portions 6a and 6a are connected to the end wall portion 4 on the rear side (X2 side), and the outer side is connected to the end wall portion 4 on the front side (X1 side). By connecting the ends 6b and 6b, the telescopic cover can be smoothly expanded and contracted.

Further, in the present embodiment, the cover member 1 is a gate type and the top plate portion is formed in a flat shape, but the cover member 1 is not limited to this and can be formed into various shapes such as an arch type, a chevron shape, and a one-sided inclined type. be. For example, FIG. 8 shows a rear view of a telescopic cover made of a chevron-shaped cover member. As shown in the figure, since the left and right units 15 and 15 are independently attached to the end wall portion 4, the end wall portion 4 is formed so as to be inclined according to the shape of the top plate portion of the cover member, and the end wall portion 4 is formed. It is possible to arrange the left and right units 15 and 15 according to the shape of. As a result, the space inside the cover member 1 can be effectively used as a storage space for the object to be stored B.

The constituent elements disclosed in the present embodiment and the above-described modifications can be combined with each other, and by combining them, new technical features can be formed.

1 Cover member 2 Cover body 2a Top plate 2b Side wall 4 End wall 5 Stopper 6 1st tension spring 6a 1st tension spring center side end 6b 1st tension spring outer end 7 1st support 8 Rotating arm 9 2nd support 11 Arm 12 Shaft 13 2nd tension spring 14 3rd support 15 Unit 16 1st locking 17 2nd locking

Claims (4)

It is a telescopic cover configured by combining a plurality of cover members in a nested manner so as to be expandable and contractible in the front-rear direction. A pair of left and right rotating arms that can rotate in the horizontal direction are attached to one of the adjacent end wall portions, and the telescopic cover is in a contracted state. The pair of left and right rotating arms are arranged in the initial posture with the tip side of the arm facing the center side in the left-right direction, and the pair of left and right first tension springs are arranged between the end walls of the left and right sides. 1 The tension spring is telescopic in which the ends on the center side in the left-right direction are connected to the tip ends of the rotating arms arranged on the same side in the left-right direction, and the outer ends in the left-right direction are connected to the other end wall portion. cover. The telescopic cover according to claim 1, wherein an elastic member is provided that provides a restoring force for returning the rotating arm to the initial posture when the tip end side of the rotating arm rotates in the front-rear direction. The rotating arm includes an arm portion to which the first tension spring is connected to the tip portion and a shaft portion provided in the middle of the arm portion, and is an end wall portion of a cover body adjacent to the telescopic cover in a contracted state. A pair of left and right second tension springs are arranged between the elastic members, and the pair of left and right second tension springs are rear of the arm portion in which the ends on the center side in the left and right directions are arranged on the same side in the left and right directions. The telescopic cover according to claim 2, wherein the telescopic cover is connected to an end portion and the outer end portion in the left-right direction is connected to the one end wall portion. 3. Claim 3 that satisfies the relationship of X> Y when the distance from the tip of the arm portion to the shaft portion is X and the distance from the rear end of the arm portion to the shaft portion is Y. The telescopic cover described in.

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