JPH0243984Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to counterbalances for windows.
The balance force can be easily adjusted even after the window is assembled between the window and the window frame.

[Conventional technology]

The conventional technology for this type of counterbalance is
The applicant has previously installed a ratchet mechanism 10 in a connecting member 11 between the counterbalance 1 and the window 8, as shown in FIGS. A method was proposed in which a predetermined initial spring pressure is applied to the torsion spring 3 (Japanese Utility Model Publication No. 16214/1983). In this case, the plate portion 11 of the connecting member 11 fixed to the lower end of the window 8
A ratchet pawl 13 for preventing the ratchet gear 12 from rotating in reverse is provided above c. In the figure, numeral 4 is a screw plate, 5 is a nut member, 7 is a window frame, 14
19 is a biasing spring, and 19 is a tightening operation section.

[Problem that the invention attempts to solve]

In such a conventional example, if excessive spring pressure is applied to the torsion spring 3 due to over-tightening,
The effort required to reduce the spring pressure was complicated and troublesome. That is, in order to reduce the spring pressure, it was necessary to once disassemble the fixing portion between the counterbalance 1 and the window 8 or the window frame 7, relax the torsion spring 3, and then reassemble the disassembled portion.

This invention is intended to solve the above-mentioned problems, and its main purpose is to make it possible to reduce the spring pressure of the torsion spring 3 due to over-tightening with a simple operation.

Another object of this invention is to simplify the structure of the connection between the counterbalance 1 and the window 8, thereby reducing manufacturing costs.

[Means for solving problems]

This invention focuses on a ratchet mechanism 10, in which the ratchet pawl 13 of the mechanism 10 can be released from the lower space side of the connecting member 11, so that the torsion spring 3 can be easily relaxed as needed. so that

Specifically, as shown in FIG. 1, a ratchet gear 12 of a ratchet mechanism 10 is supported on a connecting member 11 so as to be horizontally rotatable, and this gear 12 and a ratchet pawl 1 are connected to each other.
3 is placed on the lower surface side of the connecting member 11. Further, a boss 15 is provided protruding from the upper surface of the ratchet gear 12, and the lower end of the screw plate 4 is connected to the boss 15 so as to be rotatable together.

[Effect]

With counterbalance 1 installed,
Since the ratchet pawl 13 is arranged on the lower surface of the connecting member 11, which is the only open space, even if excessive spring pressure is applied to the torsion spring 3 due to over-tightening, the ratchet claw 13 can be removed from the lower surface of the connecting member 11. By releasing the ratchet pawl 13, the torsion spring 3
can be easily relaxed.

[Effect of idea]

As described above, according to this invention, the ratchet pawl 13 can be simply connected to the ratchet gear 12 without having to perform complicated work such as disassembling and reassembling the fixing points between the counterbalance 1 and the window frame 7 or the window 8. The torsion spring 3 can be easily removed by simply releasing the connection.
The spring pressure of the torsion spring 3 can be reduced compared to the conventional counterbalance of this type.
Even if it is over-tightened, the balancing force can be set quickly and accurately. As a result, it is possible to shorten construction time and reduce construction costs. Further, it is possible to effectively prevent a situation in which the initial spring pressure of the torsion spring 3 becomes excessive and it takes more effort than necessary to move the window 8 up and down.

The ratchet mechanism 10 is integrated into a plate-shaped connecting member 11 fixed to the window 8, and the ratchet gear 1
2 and the screw plate 4 are connected separately,
Compared to the conventional structure in which the ratchet mechanism 10, the connecting member 11, and the torsion spring 3 are integrated, the structure of the connecting part between the counterbalance 1 and the window 8 can be simplified, and the cost can be reduced accordingly.

〔Example〕

1 to 4 show specific examples of the present invention, and the counterbalance 1 of the present invention has a helical cylindrical torsion spring 3 inside a vertically long cylindrical case 2, and a vertically cylindrical torsion spring 3 inside the spring 3. Long screw plates 4 are arranged, and a nut member 5 that is screwed with the screw plate 4 is rotatably supported at the outer edge of the lower end of the case 2, the lower end of the torsion spring 3 is attached to the nut member 5, and the upper end of the spring 3 is attached to the end They are each fixed to the upper end of the case 2 via metal fittings 6.

The screw plate 4 is obtained by twisting a band-shaped flat plate around the longitudinal axis. When the screw plate 4 moves up and down together with the window 8, the nut member 5 is rotated, and the torsion spring 3 is deflected in the tightening direction and the loosening direction.

In Figure 4, the counterbalance 1 is the window frame 7.
are arranged within the vertical frames 7a on the left and right of the vertical frame 7.
A window 8 that moves up and down along a is supported in a suspended manner from the left and right.

Fix the upper end of the case 2 to the vertical frame 7a with screws 9,
The lower end of the screw plate 4 protruding downward from the case 2 is connected and fixed to the lower end of the window 8 via a ratchet mechanism 10 and a connecting member 11. This connecting member 11 has a U-shape with an open bottom in a longitudinal side view, and an upper surface plate 11a has screws 22 attached to the lower part on the window 8 side.
is fixed.

The ratchet mechanism 10 includes a ratchet gear 12 that is rotatably supported by a connecting member 11, a ratchet pawl 13 that prevents the gear 12 from reversing, that is, rotation in the direction in which the torsion spring 3 is relaxed, and this pawl 13.
This consists of a spring 14 which swings and urges the gear 12 into a position where it is always engaged.

The ratchet gear 12 and the ratchet pawl 13 are each arranged in a space surrounded by the front and rear side plates 11b, 11b below the top plate 11a of the connecting member 11. Of these, the ratchet pawl 13 is connected to the connecting member 1.
It is pivotally supported on the top plate 11a of No. 1 so as to be swingable around a vertical axis 13a.

A boss 15 for connecting the screw plate 4 and a small-diameter boss 16 for tightening the ratchet gear 12 are provided on the upper and lower sides of the ratchet gear 12, respectively. The former boss 15 is the top plate 11 of the connecting member 11.
The screw plate 4 is rotatably supported by the upper surface plate 11a in a state of protruding upward from the boss 15, and the lower end of the screw plate 4 is fitted into the slit 17 formed in the protruding part of the boss 15, and fixed with a spring pin 18 to prevent it from coming off. This allows the screw plate 4 to rotate together with the ratchet gear 12. At the lower end of the latter boss 16,
In the illustrated example, a tightening operation portion 19 for engaging a tightening tool such as a driver or a wrench is formed as a groove.

The main counterbalance 1 as described above is
The torsion spring 3 is assembled to the window frame 7 and the window 8 without applying initial spring pressure. In this state, the ratchet gear 12 is tightened and rotated using a tool engaged with the tightening operation portion 19. As a result, the screw plate 4 rotates, and the nut member 5 screwed therewith rotates, thereby tightening the torsion spring 3. Thereafter, appropriate spring pressure is applied to the torsion spring 3 according to the weight of each window 8 by measuring the tightening torque or by measuring the opening/closing force of the window 8 . In other words,
It is assumed that the window 8 can stop at any position in the upper and lower opening/closing areas.

If you accidentally adjust the initial spring pressure too much,
If this continues, excessive effort will be required to open and close the window 8 (move it up and down). Therefore, in this case, the ratchet pawl 13 is swung against the spring 14 to disengage the ratchet gear 12, loosen the torsion spring 3, and reduce the spring pressure. Thereafter, the ratchet pawl 13 is engaged with the ratchet gear 12, and the ratchet gear 12 is again tightened and rotated to make the spring pressure of the torsion spring 3 appropriate.

Note that during use, a large upward tensile force acts on the ratchet gear 12, but as described above, the ratchet gear 12 is arranged on the lower surface side of the connecting member 11,
If the retaining ring 21 provided on the upper surface side is used to prevent the retaining member from slipping out, it can withstand a larger tensile load.

[Modified example]

FIG. 5 shows a modification of the fixing structure between the screw plate 4 and the ratchet gear 12 in the above embodiment. In this case, the upper boss 15 is omitted, a vertically penetrating connecting hole 17a is formed in the ratchet gear 12, and the lower end of the screw plate 4 inserted into the hole 17a is fixed with a spring pin 18. The lower end edge of the screw plate 4 can be used as a tightening operation section 19.

In each of the above embodiments, it is assumed that the torsion spring 3 alone obtains the balancing force, but it is not necessary to do so. is arranged in advance to balance this spring pressure to a certain extent with the weight of the window 8, so that the torsion spring 3 is mainly applied to the window 8.
It may also function as a fine adjustment for stopping the opening at an arbitrary open position. The nut member 5 may also be entirely rotatable within the case 2.

Further, the ratchet pawl 13 does not necessarily need to change its posture by swinging displacement, but may change its posture by linear displacement.

Furthermore, it is assumed that the seaming operation part 19 has a structure other than a groove depending on the tool used. For example, the boss 16 may be provided with a hexagonal hole, or the boss 16 may have a hexagonal cross section and be tightened with a ratchet trench. It may be possible to do so.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional view of the counterbalance, FIG. 2 is a vertical cross-sectional front view of the main part showing details of the ratchet mechanism, and FIG. The figure is a view taken along line A--A in FIG. 2, and FIG. 4 is a front view of the window. FIG. 5 is a longitudinal sectional front view of the main parts showing another embodiment of the present invention. Figures 6a and 6b show conventional examples, respectively.
FIG. 6a is a vertical front view, and FIG. 6b is a sectional view taken along the line B--B in FIG. 6a. 1...Counterbalance, 2...Case, 3...
...Torsion spring, 4...Screw plate, 5...Nut member, 7...Window frame, 8...Window, 10...Ratchet mechanism, 11...Connection member, 11a...Top plate of connection member, 11b... ...Side plate of connecting member, 12...
Ratchet gear, 13... Ratchet pawl, 14...
...Spring, 15...Boss for connecting spring plate, 19...
Sealing operation section.

Claims (1)

[Claims for Utility Model Registration] A helical cylindrical torsion spring 3 is disposed across an upper inner surface of a cylindrical case 2 and a nut member 5 rotatably supported at the lower end of the cylindrical case 2. Fix the upper end to the case 2 and the lower end to the nut member 5, insert the vertically long screw plate 4 into the case 2 in a state where it is screwed into the nut member 5, and attach the upper end of the case 2 to the window frame 7. In a window counterbalance in which the lower ends of the screw plates 4 are fixed to the windows 8 via connecting members 11, a ratchet gear 13 is rotatably supported on the connecting member 11, and the lower ends of the screw plates 4 can be rotated together with the gear 12. A counterbalance for a window, characterized in that a tightening operation part 19 connected to a ratchet gear 12 and a ratchet pawl 13 that engages and disengages from the gear 12 are arranged on the lower surface side of the connecting member 11.