JPH083304B2 - Counter balance mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a counter balance mechanism for stopping a shoji 3 at an arbitrary vertical height position, for example, in a raising / lowering window as shown in FIG.

However, the counter balance mechanism of the present invention is not limited to the raising / lowering window, and can be applied to the case of holding a heavy inversion window or the like at an arbitrary opening angle.

[Conventional technology]

A conventional example of this type of counterbalance mechanism is, for example, Japanese Utility Model Publication No. 59-14622.

A conventional example thereof will be described with reference to the accompanying drawings, particularly FIG. 2. The sash 1 has a vertically long pipe 5 arranged in vertical grooves 2 formed in the left and right vertical frames 1a, and the upper end of the pipe 5 is It is fixed to the sash 1 side, a screw plate 8 having a large lead angle is vertically movably inserted into the pipe 5, and a nut member 10 screwed onto the screw plate 8 is rotatably attached to the lower end side of the pipe. A spiral spring 9 is fitted in the outer periphery of the screw plate 8 in the pipe 5, and the upper end of the spiral spring 9 is located near the upper end of the pipe 5.
The lower end of the screw plate 8 is connected to the nut member 10, and the protruding lower end of the screw plate 8 is connected to the shoji 3 through the connecting member 7. And when installing it on the window, the spiral spring 9
Was preliminarily wound and given a constant initial spring pressure, and it was set so that it would not drop by its own weight when the shoji 3 was pulled up to the uppermost position.

[Problems to be Solved by the Invention]

In such a counter balance mechanism, when the shoji 3 is moved downward, the nut member 10 that is screwed into the screw plate 8 is required to smoothly rotate to wind and tighten the spiral spring 9.

The problem is how to support the nut member 10 at the lower end of the pipe 5 so that the nut member 10 cannot be pulled out downward and can only rotate.

With respect to this point, conventionally, the lower end of the metal pipe 5 is drawn in a state where the nut member 10 is inserted into the lower end portion of the pipe 5 to prevent the metal pipe 5 from coming out downward. Therefore, there is a first problem in that the drawing process is troublesome and the assembling workability is poor, and the cost is high due to these problems.

It is desirable that the outer surface of the pipe 5 be colored to improve the appearance of the product and prevent corrosion. However, in the conventional method, coloring is applied after drawing in order to avoid damage to the outer surface of the pipe during drawing, and the surface coloring of the pipe 5 to which parts such as the nut member 10 are assembled requires a considerable increase in cost. Was there. In order to facilitate the drawing process, it is desirable that the pipe 5 be a round pipe, and it is difficult to make the cross-sectional shape of the pipe 5 arbitrary (for example, hexagonal or octagonal). There was a problem.

Further, it is desirable that the nut member 10 rotate at a fixed position at the lower end of the pipe 5. However, the conventional nut member 10 can move upward only by preventing the nut from falling out. Therefore, the vertical play of the nut member 10 makes it difficult to finely adjust the initial spring pressure of the spiral spring 9. Since the upward pulling force acts on the nut member 10 due to the tightening of the spiral spring 9, the upper end of the screw plate 8 may be disengaged from the nut member 10 when the shoji 3 is lowered to the lower limit. If this is attempted to be prevented, there is a problem in that the dimensions of each part are overwhelmed.

Therefore, an object of the present invention is to provide a counterbalance that is excellent in workability of assembling the nut member 10 to the pipe 5, and can freely perform surface coloring treatment of the pipe 5, selection of material and selection of cross-sectional shape, and realization of low cost production. To get the mechanism.

Another object of the present invention is to obtain a counter balance mechanism that allows the nut member 10 to rotate at a fixed position at the lower end of the pipe 5 without moving up and down.

[Means for solving the problem]

The present invention, in the counterbalance mechanism having the above-described basic structure, has the collar member 20 fixed to the lower end of the pipe 5, and the collar member 20 is provided with the plurality of elastically deformable engaging claws 20b on the upper portion. That the engaging groove 21 is formed on the inner surface of the lower end of the pipe 5, and the collar member 20 is lowered by engaging the engaging claw 20b with the lower end of the pipe 5 and engaging with the engaging groove 21. Is secured to the bottom of the nut member 10, and a plurality of elastically deformable engaging claws are provided below the nut member 10.
10c is formed, and the nut member 10 is received by the collar member 20 in order to prevent the nut member 10 from coming off, and the engaging claw 10c is restricted from moving upward on the inner surface of the collar member 20. It is required that it be rotatably supported in a fixed position.

[Action]

A plurality of elastically deformable engaging claws 20 on the upper portion of the collar member 20.
The b is provided because the engaging claws 20b can be easily fitted inside the lower ends of the pipes 5 by utilizing the elastic deformation of the engaging claws 20b. Inner surface engagement groove 21
This is because the collar member 20 is automatically engaged with and the collar member 20 is fixed to the lower end of the pipe 5 by the engagement.
This makes it possible to omit the conventional drawing process on the lower end of the pipe.

A plurality of engaging claws 10c elastically deformable below the nut member 10
The reason why the collar member 20 is formed is to prevent the nut member 10 from moving downward while preventing the nut member 10 from coming off with the collar member 20, so that the nut member 10 is at a fixed position at the lower end of the pipe 5. This is because only rotation is possible. That is, the engaging claws 10c are easily elastically deformed to engage with the inner surface of the collar member 20 from above, so that the engaging claws 10c are engaged with each other.
The upward movement of the nut member 10 is restricted by engaging with the inner surface of the. That is, the nut member 10 is
Since the portion including c is fitted inside the engaging claw 20b at the upper portion of the collar member 20, the engaging claw 20b and the engaging groove 21 on the pipe side are firmly attached in the assembled state. And

That is, at the time of assembling, the collar member 20 is previously attached to the lower end of the pipe 5 by engaging the engaging claw 20b and the engaging groove 21. Next, the nut member 10 to which the lower end of the spiral spring 9 is fixed is fitted into the pipe 5 from the upper end of its opening.
After introducing the nut member 10 near the lower end of the pipe 5, apply a predetermined tool from the outside of the lower end of the pipe 5 to the collar member 20.
When the nut member 10 is passed through the inside and hooked on the nut member 10 and the nut member 10 is pulled down by the tool until it is received by the collar member 20, the engaging claw 10c of the nut member 10 is rotatably but upward on the inner peripheral surface of the collar member 20. The loose movement is regulated and engaged. After that, the screw plate 8 is inserted from the upper end side into the collar member 20, the nut member 10 and the spiral spring 9 in the pipe 5 from the lower end of the pipe 5, respectively.

When applied to a window for raising and lowering, the upper end of the pipe 5 is fixed to the sash 1, and the lower end of the screw plate 8 protruding below the pipe is connected to the lower end of the shoji 3 through the connecting member 7.

〔The invention's effect〕

According to the present invention, the collar member is provided at the lower end of the pipe 5.
By engaging the engaging claws 20b of 20 and elastically engaging the engaging claws 20b with the engaging grooves 21 on the pipe 5 side, the collar member 20 is attached to the lower end of the pipe 5 by the engaging claws 20b. By using the elastic deformation of, it can be easily and easily attached with a downward stopper. Moreover, the nut member fixed to the lower end of the spiral spring 9
The nut 10 is fitted into the pipe 5 from the upper end of its opening, and the engaging claw 10c of the nut member 10 is elastically deformed to rotatably engage the engaging claw 10c with the inner surface of the collar member 20. Since a part of the member 10 is fitted in the engaging claw 20b of the collar member 20, the state in which the engaging claw 20b is engaged with the engaging groove 21 can be reliably maintained. Therefore, the nut member 10 is received by the collar member 20 and does not slip off downward, and it is possible to completely eliminate the conventional inconvenience of drawing the lower end of the pipe and to assemble these parts with the engaging claw 20.
Since it can be easily done by utilizing the elastic deformation of b and 10c, it is excellent in workability of assembly and contributes to reduction of manufacturing cost.

Further, the nut member 10 can rotate without floating upward at the fixed position of the lower end received by the collar member 20 in the pipe 5 by the above-mentioned engaging action of the engaging claw 10c. Therefore, the delicate initial spring pressure adjustment of the spiral spring 9 can be easily performed, and even if the screw plate 8 is pulled down to the maximum in the mounted and used state, the upper end of the screw plate 8 can be well prevented from coming off from the nut member 10.

[Embodiment] The drawings show an embodiment in which the counter balance mechanism of the present invention is suitable for a raising and lowering window.

In Fig. 4, the window for raising and lowering is seen from the inside of the room, and vertical grooves 2.2 are formed in the left and right vertical frames 1a, 1a of the aluminum sash 1, and two upper and lower windows are formed along this vertical groove 2.2. Glass shoji 3
・ 3 moves up and down. Each of the shoji screens 3 is supported by a pair of left and right counter balance mechanisms 4 and 4 provided in the left and right vertical grooves 2 and 2, and can be set at any upper and lower positions.

1 to 3, the counter balance mechanism 4 includes a vertically long pipe 5, a mounting member 6 for connecting and fixing the pipe 5 to the upper part of the sash 1, and a connecting member 7 connected to the lower part of the shoji 3. And a long screw plate 8 which is inserted into the pipe 5 and whose lower end is fixed to the connecting member 7, and which is spirally wound around the outer periphery of the screw plate 8 and whose upper end is fixed to the mounting member 6. It comprises a spiral spring 9 and a nut member 10 which is rotatably mounted on the lower end of the pipe 5, the lower end of the spiral spring 9 is fixed, and the screw plate 8 is screwed in the inserted state.

The pipe 5 is an extruded product of an aluminum material, the inside of which is circular in cross section and the outer diameter of which is a regular octagon, and the outer surface of which is anodized beforehand.

The upper mounting member 6 is a zinc die cast product as shown in FIGS. 2 and 3, and is formed in an L-shape in which the base portion of the horizontal mounting seat 6a is connected to the tubular portion 6b downward. , The tubular portion 6b is fitted in the upper end portion of the pipe 5 from above, and 2
It is fixed to the pipe 5 with a screw 11 of the book, and the mounting seat 6a is attached to the upper frame 1b of the sash 1 with the screw 12.

The spiral spring 9 is formed by winding a long strip-shaped spring plate into a coil. The upper end of the spiral spring 9 is wound around the outer periphery of the cylindrical portion 6b of the mounting member 6 and supported by being suspended.

The connecting member 7 is preferably made of a plastic material having a self-lubricating property, such as nylon resin or polyacetal resin, and its tip side is fixed to the lower frame 3a of the shoji 3 with a screw 13. A metal screw plate support member 14 formed in a short cylindrical shape is provided at the base end of the connecting member 7.

The screw plate 8 is formed by gently twisting a strip-shaped metal flat plate so that the lead angle increases as it goes upward.
The lower end of the screw plate 8 is inserted into the screw plate supporting member 14 and fixed by a through pin 15.

When the shoji screen 3, that is, the screw plate 8 is pushed up to the uppermost position, the upper portion of the screw plate 8 projects vertically into the central through hole 16 of the tubular portion 6b of the mounting member 6 as shown in FIG. So that the length of the screw plate 8 is set. As a result, the screw plate 8 can be set longer than the conventional one by the length of the protrusion into the cylindrical portion 6b, and can cope with a case where the shovel 3 has a large vertical stroke.

The screw plate support member 14 can be rotated from below to rotate the spiral spring 9 by a driver, and the ratchet member 17 can prevent its reversal. An initial spring that balances with can be added.

The nut member 10 is also a self-lubricating plastic molded product such as nylon resin or polyacetal resin, and the lower end portion of the spiral spring 9 is wound around and fixed to a cylindrical portion 10a extending integrally above the nut member 10. As shown in FIG. 1, the screw plate 8 is inserted into the center hole 18 of the cylindrical portion 10a, and the screw plate 8 is inserted into the slit-shaped engagement hole 19 formed inside the nut member 10.
Is screwed through.

A downward annular step portion 10b is formed on the outer periphery of the nut member 10, and further four engaging claws each of which is independently elastically deformable inward and outward by forming a slit in a tubular portion below the annular step portion 10b.
Formed 10c.

The nut member 10 is a collar member 20 fixed in advance to the lower end of the pipe 5 via the engaging claw 10c and the step portion 10b.
It is supported so that it cannot move up and down, but rotatably.

The collar member 20 is also a plastic molded product having a self-lubricating property, such as nylon resin or polyacetal resin, and four engaging claws which are independently elastically deformable inward and outward are provided above the step portion 20a on the upper surface. Equipped with 20b,
A downward step portion 20c is formed in a circular shape on the inner peripheral surface of the collar member 20.

An annular engagement groove 21 is formed in the lower portion of the inner surface of the pipe 5, and when the engagement member 20b is press-fitted into the pipe 5 from the lower end side of the opening of the engagement member, the engagement member 21 is engaged. After 20b is elastically deformed inward, the upper ends of the engaging claws 20b are engaged with the engaging groove 21 by an elastic restoring force, whereby the collar member 20 is restrained from coming off and coming out below the pipe 5. . At the same time, the upward step 20a of the collar member 20 is received by the lower end of the pipe 5.

When assembling the counter balance mechanism 4 of the present invention, the upper end of the spiral spring 9 is fixed to the cylindrical portion 6b of the upper mounting member 6, and the lower end of the spiral spring 9 is fixed to the cylindrical portion 10a of the nut member 10.
Stick to.

Separately, a collar member 20 is provided at the lower end of the pipe 5 for engaging the claw 20.
While b is fitted inside, fix it integrally as described above.

Thus, the nut member 10 integrated with the mounting member 6 via the spiral spring 9 is fitted into the pipe 5 from the upper end of the opening thereof, and the nut member 10 is introduced near the lower end of the pipe 5.

Next, for example, a tool having a T-shaped upper end is prepared, the tool is inserted into the pipe 1 from the outside of the lower end thereof, and the T-shaped tip portion of the tool is inserted into the engaging hole 19 of the nut member 10 and the nut is inserted. Hook on the member 10 and forcibly pull down the nut member 10 with the tool. As a result, the lower engaging claws 10c of the nut member 10 once elastically deform inward and enter the inside of the collar member 20, and the engaging claws 10c of the respective engaging claws 10c are provided on the step portion 20c near the inner lower end of the collar member 10. At the same time that the lower end engages in a wraparound manner, the downward step 10b of the nut member 10 is received by the upper end of the engaging claw 20b of the collar member 20. Then, the lower inner fitting portion of the nut member 10 pushes the engaging claws 20b of the collar member 20 from the inside outward, whereby each engaging claw 20b is engaged with the engaging groove 21 on the pipe 5 side. To maintain.

Since the downward cylinder 6b of the upper mounting member 6 is internally fitted to the upper end of the pipe 5, the cylinder 6b is attached to the pipe 5 by the screw 11.
To fix.

Successively, the screw plate 8 is inserted into the pipe 5 from the lower end of the opening thereof. That is, the screw plate 8 is inserted from the upper end side through the collar member 20 and the slit 19 into the nut member 10 and then the spiral spring 9 while rotating about the vertical axis. After that or in advance, the connecting member 7 is fixed to the lower end of the screw plate 8 via the support member 14 in the above-described manner.

With this, the counter balance mechanism 4 of the present invention is unitized. When attaching this to the window
As shown in FIGS. 4 and 5, the upper mounting member 6 is attached to the upper frame 1b of the sash 1, and the lower connecting member 7 is attached to the lower frame 3a of the shoji 3.
Each will be stopped as described above.

According to the counter balance mechanism 4 of the present invention, the spiral spring 9 is preliminarily tightened by rotating the spring plate support member 14 to apply a constant initial spring pressure, and even when the shoji 3 is pulled up to the uppermost position, the screw Initial setting is performed so that the wear engagement force between the plate 8 and the nut member 10 overcomes the weight of the shoji 3 and the shoji 3 does not descend by its own weight.

When the initial setting is performed in this way, the screw plate 8 is pulled out by pulling down the shoji 3, and accordingly, the nut member 10 screwed onto the screw plate 8 is rotated to gradually tighten the spiral spring 9, The spiral spring 9 by this tightening
The screw plate 8 and the nut member 10 are more strongly frictionally engaged with each other by the repulsive force of the sliding door 8, and this frictional engagement force overcomes the pulling force of the shoji 3 and the own weight of the shoji 3 due to the repulsive force of the spiral spring 9 to cause the glass door 3 to move. It will be supported and fixed at any vertical height position.

[Another embodiment example]

The upper end of the spiral spring 9 may be connected to the upper end of the pipe 5 by an appropriate member, and the mounting member 6 as shown in the figure.
It does not need to be fixed to.

The stepped portion 20c on the collar member 20 side with which the engaging claw 10c of the nut member 10 engages may be formed as a circumferential groove. The nut member 10 may be received and supported not by the engaging claw 20b of the collar member 20 but by a receiving surface provided separately. The engagement groove 21 on the pipe 5 side may be a hole.

[Brief description of drawings]

The drawings show an embodiment of the counterbalance mechanism according to the present invention. FIG. 1 is a vertical cross-sectional view of a main part, FIG. 2 is a vertical cross-sectional view in use, and FIG. 3 is an exploded perspective view. The figure is a front view of the raising and lowering window as viewed from the inside of the room. 1 ... Sash, 2 ... Vertical groove, 3 ... Shoji, 4 ... Counterbalance mechanism, 5 ... Pipe, 8 ... Screw plate, 9 ...
... spiral spring, 10 ... nut member, 10c ... nut member engaging claw, 20 ... collar member, 20b ... collar member engaging claw, 20c ... collar member step, 21 ... engagement groove.

Claims (2)

[Claims] 1. A vertically long pipe (5) and a connecting member (7) located outside the lower end opening of the pipe (5).
And a screw plate (8) which is inserted into the pipe (5) and whose lower end is fixed to the connecting member (7), and which is spirally wound around the screw plate (8) in the pipe (5). , A spiral spring (9) whose upper end is fixed near the upper end of the pipe (5), and a spiral spring (9) which is rotatably arranged at the lower end of the pipe (5) and whose lower end is fixed, Also, the screw plate (8) has a nut member (10) that is screwed in the inserted state, and has a collar member (20) fixed to the lower end in the pipe (5), and the collar member (20) is on the upper part. A plurality of elastically deformable engaging claws (20b) are provided, an engaging groove (21) is formed on the inner surface of the lower end of the pipe (5), and the collar member (20) has an engaging claw (20b). The lower end of the pipe (5) is engaged with the engagement groove (21) to prevent the pipe from falling off. A plurality of elastically deformable engaging claws (10c) are formed on the lower side, and the nut member (10) is received by the collar member (20) in order to prevent the nut member (20) from slipping down. A counterbalance mechanism characterized in that an interlocking claw (10c) is supported by an inner surface of a collar member (20) so as to be restricted from moving upward and rotatably in a fixed position. 2. A raising / lowering window having a structure in which a lower shoji (3) located at least inside a room moves up and down along vertical grooves (2) formed in left and right vertical frames (1a) of a sash (1). In the counterbalance mechanism, the upper end of the pipe (5) is fixed to the sash (1) and disposed in the vertical groove (2), and the connecting member (7) is connected to the lower end of the shoji (3). Counterbalance mechanism described.