JPS6329098Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a winding wheel device for a shutter around which a slat curtain of the shutter is wound.

The general structure of this type of wheel device is that a plurality of hoisting wheels arranged on an axis are connected together by a connecting bar that communicates with the outer peripheral wall of each wheel. The winding wheel is rotated in the winding direction by the stored elastic torque of a torsion coil spring interposed between the winding wheel and the fixed shaft through which the winding wheel is inserted.

By the way, a torsion coil spring has a characteristic that its axis length changes as the number of turns changes, so in the case of a large hoisting wheel device,
The coupling structure of the connecting bar to the hoisting wheel is such that it has a certain degree of freedom of movement in the axial direction, but in contrast, small hoisting wheel devices such as those used in window shutters In this case, a fixed connection method is used to connect the hoisting wheel and the connecting bar, and conventionally, the connecting bar was fixed to the hoisting wheel by welding.

However, the hoisting wheel device integrally formed by welding has the following problems.

(a) As only those with welding skills could perform the shutter assembly work on site, there were restrictions on the staffing for the work.

(b) Since the welding position of the connecting bar to the hoisting wheel was determined visually by the operator, there was a high possibility that the assembled dimensions would be bent or twisted.

(c) The connecting bars tend to twist due to thermal stress during welding, and even though the connecting bars made of flat plates have low rigidity, the amount by which the slats tend to tilt downward tends to be large.

The present invention was devised to solve the above-mentioned problems, and the purpose of the present invention is to create a compact shutter that does not require training in assembly work and does not cause the slats to tilt downward. An object of the present invention is to provide a hoisting wheel device.

As a means to achieve this object, the hoisting wheel device of the present invention has a protruding piece formed to protrude in the centripetal direction with the root of the connecting bar facing each hoisting wheel, and a protrusion formed on the outer circumferential wall of the hoisting wheel and one side of the hoisting wheel. A step part formed in a concave manner to have an L-shaped cross section on the side wall, and a fixing screw for tightening the protrusion piece to the hoisting wheel while the protrusion piece and its base are engaged with the step part. It is characterized by what it did.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in FIGS. 1 and 2, the hoisting wheel device of the embodiment includes a plurality (three in the figure) of equally shaped hoisting wheels 2, 3, 4 inserted through a fixed shaft 1, A connecting bar 5 consisting of a plurality of (two) long plates connecting a plurality of locations on the outer periphery of each wheel 2 to 4 (in the illustration, two opposing locations) is integrally fixed to the intermediate A torsion coil spring 6 is interposed between the wheel 3 and the fixed shaft 1.

Both ends of the connecting bar 5 are folded at right angles in the centripetal direction to form projecting pieces 5a and 5b, and a projecting piece 5c is formed in the middle of the bar 5 by separately welding an L-shaped piece. and each protrusion 5a~
A mounting hole 7 is formed in each of the holes 5c.

On the other hand, the opposing 2 on the 1 diameter line of each wheel 2 to 4
The locations include the outer peripheral wall and one side wall (wheels 2 and 3).
In the case of wheel 4, cut step portions 2a, 3a, and 4a having an L-shaped cross section are formed on the left side wall in the drawing, and on the right side wall in the drawing for the wheel 4.
is formed into a recess, and furthermore, a shaft hole 8 passing through each wheel 2 to 4 is formed in the stepped side wall, and an opening on the opposite side of each shaft hole 8 is formed into a nut holder 8a. has been done.

However, the first hoisting wheel device was assembled.
In the embodiment shown in the figure, each protruding piece 5a to 5b and its base tightly engages with the notch step portions 2a, 3a, 4a of each wheel 2 to 4, and also passes through the mounting hole 7 and shaft hole 8 to the nut receiver. Each protrusion 5a, 5b, 5c is fastened and fixed to each wheel 2-4 by each fixing screw 10 screwed into a nut 9 in 8a.

In the hoisting wheel device of the embodiment configured in this way, the assembly is performed by screwing the fixing screw 10, so no special skills are required for the operation, and the connecting bar is not required during assembly. Since the longitudinal and radial positioning of 5 is effected by engagement with the cut steps 2a, 3a, 4a, assembly is carried out accurately.

In addition, since the protrusions 5a, 5b, and 5c act as reinforcing ribs, the rigidity of the connecting bar 5 increases, and since there is no twisting or distortion due to heating as occurs during welding, the phenomenon of slats falling one-sidedly occurs. almost never occurs.

As described above, according to the hoisting wheel device for a shutter according to the present invention, the outer circumferential wall and one side wall of each hoisting wheel are recessed to have an L-shaped cross section, and the L-shaped stepped portion In addition, since the connecting bar and its protrusion are continuously engaged and fixed by fixing screws, the connecting bar and each hoisting wheel can be assembled and fixed easily, accurately, and firmly. The connection bar has high fixation rigidity after assembly, and does not shift or twist during use.

Furthermore, since the fixing screw is located on the side wall of the hoisting wheel, there is no problem in that the head of the fixing screw will come into contact with the shutter slat and damage the slat.

[Brief explanation of the drawing]

FIG. 1 is a front view of a hoisting wheel device for a shutter showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the same. 2, 3, 4...Hoisting wheel, 2a, 3a, 4
a...Stepped portion, 5...Connection bar, 5a, 5b, 5c
... protrusion, 10 ... fixing screw.

Claims (1)

[Scope of utility model registration request] In a shutter hoisting wheel device in which a plurality of hoisting wheels arranged on an axis are integrally connected by a connecting bar communicating with an outer peripheral wall of each hoisting wheel, the hoisting wheel of the connecting bar is opposed to each hoisting wheel. A protruding piece formed to protrude in the centripetal direction with the point as the root, a stepped part recessed into an L-shaped cross section on the outer circumferential wall and one side wall of the hoisting wheel, and the protruding piece and its root are the same. a fixing screw that fastens the projecting piece to the hoisting wheel while engaged with the step;
A shutter hoisting wheel device comprising: