JPS6310070Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing device for a winding drum in a shutter, in which a winding drum around which a shutter slat is wound is rotatably supported around a fixed shaft.

In general, the shutter slat is wound around the winding drum by the rotation of the winding drum, which is rotatably supported via a bearing on a fixed shaft fixedly supported within the shutter case. Traditionally,
This type of bearing device has a fixed shaft 1 as shown in FIG.
It is composed of an inner ring 10 which is fitted and fixed on the outside and has a running track 7 for a single thread of rotating balls 6 formed on its outer periphery, and an outer ring 11 which is fixed to the winding drum 3 and covers the rotating balls 6 from the outside. has been done. However, since this bearing device has a structure in which the bearing is supported by a single rotating ball 6, it lacks safety in the axial direction of the winding drum 3, and the boss portion 3a of the winding drum 3
If the winding drum 3 contacts the fixed shaft 1 or the inner ring 10, or the outer ring 11 contacts the inner ring 10, the smooth rotation of the winding drum 3 is hindered and the durability is also adversely affected. There were flaws. Therefore, as shown in FIG. 5, it has been proposed that the boss portion of the winding drum 3 is used as an outer ring 11a of a bearing device, and the winding drum 3 is stably supported by two rotating balls 6. By the way, the winding drum 3 is wound in the winding direction of the shutter slat by winding a coil-shaped winding spring 4 whose one end is fixed to the fixed shaft 1 and the other end is fixed to the winding drum 3. Although it is biased, when the take-up spring 4 is wound up, the other end of the take-up spring, which moves with the rotation of the take-up drum 3, is in an eccentric state where it is pulled in the direction in which it is fixed to the take-up drum. This causes the inner rings 10, 10a to come into contact with each other, and of course the conventional example shown in Fig. 4,
Even if the winding spring 4 is as shown in FIG.
The disadvantages that the smooth winding and unwinding operation of the winding spring 4 is obstructed and the durability of the winding spring 4 is reduced are still unresolved.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and although it is capable of stably supporting the winding drum with two rotating balls, it also has a winding spring. It is an object of the present invention to provide a bearing device for a winding drum in a shutter that can completely prevent the shutter slat from coming into contact with the inner ring, and is not only durable but also capable of smooth winding and unwinding operations of the shutter slat. This is what I did.

The structure of the present invention will be explained based on an embodiment shown in the drawings. Reference numeral 1 denotes a fixed shaft fixedly supported by a shutter case (not shown), and a bearing device 2, which will be described later, is attached to the fixed shaft 1. A winding drum 3 is rotatably supported via the shaft. 4 is a take-up spring, and one end of the take-up spring 4 is connected to the fixture 4.
It is fixed to the fixed shaft 1 via a, and the other end is fixed to the fixture 4.
It is fixed to the winding drum 3 via b, and
A shutter slat (not shown), which has been wound a predetermined number of times and is fixed to the winding drum 3, is wound.

The inner ring 5 constituting the bearing device 2 has a fixed shaft 1
The fixed shaft 1 is fitted and fixed on the outer circumference of the fixed shaft 1 by abutting the flange portion 5a of the ring-shaped member on which the running track of the rotating ball 6 is formed on the outer circumferential surface.
The shaft is supported by two rotating balls 6 in the axial direction of the shaft. On the other hand, an outer ring 9 is fixed to the winding drum 3 via a rivet 8. Like the inner ring 5, the outer ring 9 has a fixed part 9a which is fixed to the winding drum 3 in a two-part shape, The rotating ball 6 running on the track 7 is supported by a supporting part 9b that covers the rotating ball 6 running from the outside, and an extension part 9c extending from the supporting part 9b in the axial direction of the fixed shaft 1. It is structured as follows. The other end of the winding spring 4 is fitted onto the outer periphery of the extension 9c.

Next, the operation of the present invention constructed as described above will be explained. The winding drum 3 is stably supported by two rotating balls 6 that are supported at two points by the butt-like flange portions 5a, so that the winding drum 3 is stable during winding and unwinding operations of the shutter slat. Therefore, there is no risk that the fixed shaft 1 and the inner ring 5 will come into contact with the rotating outer ring 9, and the outer ring side, that is, the winding drum 3, can always rotate smoothly. .

Moreover, the other end side of the take-up spring 4, that is, the fixed side of the take-up drum 3, is connected to the fixed shaft 1 and the take-up spring 4.
Since the extension part 9c of the outer ring 9 is loosely fitted between the outer ring 9 and the outer ring 9, when the take-up spring 4 is wound, it becomes eccentric due to the tensile force from the fixture 4b. Even if one side approaches the fixed shaft 1 and the other moves away from it, the take-up spring 4 that is close to the fixed shaft 1 is supported by being in contact with the outer periphery of the extension 9c of the outer ring 9 that rotates together with the take-up spring 4. , it does not come into contact with the inner ring 5 or the fixed shaft 1 on the fixed side. Therefore, even if the take-up spring 4 becomes eccentric due to the tensile force when being wound up, the take-up spring 4 comes into contact with the extension 9c of the outer ring 9 that rotates together with the take-up spring 4, and the take-up spring In addition to ensuring smooth winding and unwinding operations of the winding spring 4, the durability of the winding spring 4 can also be improved.

Note that the inner ring 5 and outer ring 9 of the bearing device 2 shown in the above embodiment are each split into two halves formed by joining together members of the same shape, so that the number of parts can be reduced and the manufacturing process can be simplified. This provides further effects.

In summary, the present invention has a bearing section in which a rotating ball that rotatably supports a winding drum on which a shutter slat is wound around a fixed shaft is fitted and fixed on the outside of the fixed shaft. An inner ring having two running tracks for the rotating ball and a winding drum are fixed to each other, and the rotating ball, which runs on both running tracks, is covered from the outside and is further extended in the axial direction of the winding shaft. is fixed to a fixed shaft, and the other end of the take-up spring is fixed to the take-up drum.The other end of the take-up spring is fitted around the outer ring. The supporting structure reliably prevents deflection in the axial direction, and the winding spring, which rotates for winding and unwinding together with the winding drum, is able to maintain its position on the fixed side even if it is eccentric due to the tensile force during winding. The inner ring on the fixed side, the fixed shaft, the outer ring on the rotating side, the take-up spring, and the It can completely prevent unnecessary contact with the take-up drum, is highly durable, and allows smooth rotation of the take-up drum at all times.

[Brief explanation of the drawing]

The drawings show an embodiment of a bearing device for a winding drum in a shutter according to the present invention, in which FIG. 1 is a front view of the winding drum, FIG. 2 is a side view of the same, and FIG. 3 is a main view of the winding drum. 4 and 5 are sectional views of main parts of the conventional example. In the figure, 1 is a fixed shaft, 2 is a bearing device, 3 is a winding drum, 4 is a winding spring, 5 is an inner ring, 6 is a rotating ball, 7 is a running track, 8 is a rivet, 9 is an outer ring, and 9a is a fixed 9b is a support portion, and 9c is an extension portion.

Claims (1)

[Scope of utility model registration request] The winding drum, on which the shutter slat is wound, is rotatably supported around a fixed shaft.A bearing containing a rotating ball is fitted onto the fixed shaft, and two running tracks for the rotating ball are formed on the outer periphery. The inner ring is fixed to the winding drum and covers the rotating ball running on both running tracks from the outside, and is further extended in the axial direction of the fixed shaft, with one end fixed to the fixed shaft and the other end wrapped around the rotating ball. 1. A bearing device for a take-up drum in a shutter, comprising an outer ring fitted onto the other end of a take-up spring fixed to the take-up drum.