JPH0336719Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a hoisting type shutter (made of steel), and particularly relates to an improvement of a shutter hoisting device installed above an opening.

Conventional technology and its problems A winding type shutter has a structure in which the shutter is rolled up and stored using a winding device installed at the top of the opening.When opening, the shutter is wound around the winding foil of the winding device. When opening and closing, it descends along the grooves provided on both sides of the opening. In the shutter hoisting device, as shown in a schematic diagram in FIG. 4, a take-up wheel 13 is rotatable on a shaft 12 fixed to the side wall (or the upper part of the opening) of the shutter case 11 by means such as bolt tightening. The winding wheel 13 has a structure in which a spring 14 is attached between the shaft 12 and the winding wheel 13 to apply force during winding. As shown, it is generally rotatably mounted with a ball bearing 16 interposed between a metal sleeve 15 fixed to a shaft 12.

However, the rotation mechanism using the ball bearing 16 has the drawback that when the force is applied to the biasing spring 14 when the shutter is lowered, the take-up wheel 13 is tilted and twisted, resulting in an unstable state during winding.
Furthermore, when the grease added as a lubricant becomes insufficient, metal-to-metal contact not only causes loud noise but also causes severe wear on the ball bearing 16 and sleeve 15, shortening the life of the bearing and causing rust. This has the disadvantage that the rotation of the winding wheel 13 becomes slow due to this occurrence. Conventionally, measures to prevent twisting of the winding wheel 13 have been taken such as attaching a twist prevention stopper to the shaft 12 or connecting the left and right winding wheels 13 with a stay, but these methods require a large number of parts. However, the effect was small, and on the contrary, the cost was high, which was not desirable.

Purpose of the invention This invention was made to eliminate the above-mentioned drawbacks of the conventional shutter hoisting device, which simplifies the structure of the winding wheel bearing, reduces wear, and smoothes rotation. The purpose is to provide the following.

Structure of the invention The shutter hoisting device according to the invention has a half-split structure in which the bearing portion of the take-up foil has a metal sleeve with an annular protrusion projecting on the outer periphery and three circumferential grooves on the inner periphery. The annular protrusion of the metal sleeve fixed to the shaft is rotatably fitted into the central circular groove of the synthetic resin bush fitted to the inner periphery of the foil. The feature is that the circumferential grooves on the left and right sides of the bushing are grease grooves.

That is, this invention adopts a synthetic resin bushing instead of a conventional ball bearing as a means for rotating the take-up wheel attached to the shaft, and rotates the bushing and a metal sleeve by a concave-convex fitting method. The main feature is that they are fitted together in a movable manner.

FIG. 1 is a partially cutaway front view showing an enlarged view of the winding wheel bearing of the shutter hoisting device according to this invention, in which 2 is a shaft fixed in the shutter case 11, and 3 is a winding wheel bearing. 4 is a biasing spring, 5 is a metal sleeve, and 6 is a synthetic resin bush.

The metal sleeve 5 is made by, for example, bulging the approximately middle part of an iron pipe of an appropriate length and forming an annular protrusion 5 on the outer periphery.
1, and the width and height of the annular convex portion 5-1 are appropriately determined depending on the diameter of the shaft 2, the diameter of the winding wheel 3, etc.

The synthetic resin bush 6 serves as a bearing for the take-up wheel 3, and its structure consists of three circumferential stripes on the inner periphery of a half-split cylinder having an inner diameter that is approximately the same as the outer diameter of the sleeve 5. Groove 6-1, 6-2, 6-
3 is carved, the central circumferential groove 6-2 is a concave-convex fitting groove with the sleeve 5, and the left and right circumferential grooves 6-1, 6 are
-3 is a groove for grease used as a lubricant. Here, a synthetic resin bushing was used instead of a bearing in order to reduce friction and provide soundproofing effects due to the contact between the metal (sleeve) and the synthetic resin (bush). The bush 6 is press-fitted into a bush housing recess 3-1 formed in the inner hole of the winding wheel 3, as shown in FIG.

In this invention, the metal sleeve 5 and the synthetic resin bush 6 are fitted in a convex-concave fitting manner because the left and right biasing springs 4 prevent the winding wheel 3 from escaping to the left and right in the axial direction, and the structure This is to simplify the process.

Note that a plurality of engagement holes 3 - 2 for the biasing spring 4 are bored in the winding wheel 3 .

When attaching the winding wheel 3 to the shaft 2, insert the half-split synthetic resin bushing 6 into the left and right circumferential grooves 6-.
1 and 6-3 are filled with grease, the central circumferential groove 6-2 is fitted into the annular convex portion 5-1 of the sleeve, and then the sleeve 5 is fitted externally, and the inner circumferential groove 6-2 of the take-up foil 3 is fitted. After assembling the bushing 6 by press-fitting it into the bushing storage recess 3-1 formed in the hole, the metal sleeve 5 is fitted onto the shaft 2 and screwed. After that, a biasing spring 4 is applied between the shaft 2 and the winding wheel 3. The biasing spring 4 is attached so that the left and right engagement holes 3-2 are aligned so that the force on the left and right sides is equalized.

Effect of the invention In the above structure, the winding wheel 3 rotates around the outer periphery of the sleeve 5 together with the synthetic resin bush 6 fitted between the metal sleeve 5 and the sleeve 5 .

That is, the winding foil 3 is a metal sleeve 5.
It rotates at the concave-convex fitting portion between the annular convex portion 5-1 and the central circumferential groove 6-2 of the synthetic resin bushing 6. Therefore, when the shutter is lowered, the left and right biasing springs 4 are attached to the shaft 2.
Even if a tensile force is applied to the take-up foil 3 when the metal sleeve 5 is wound, the annular protrusion 5-1 of the metal sleeve 5 is fitted into the circumferential groove 6-2 at the center of the synthetic resin bush 6. Therefore, the take-up wheel 3 will not be tilted inward and twisted. Also, the rotating part of the take-up wheel 3 is made of metal (sleeve) versus synthetic resin (button).
Due to the contact between the two, there is less friction and less noise.

Effects of the invention As mentioned above, this invention adopts a synthetic resin bush for the bearing of the winding foil, and configures the bearing part by fitting the metal sleeve with the convex and recessed parts. This has the effect of preventing twisting of the foil, and eliminates the need for a stopper or the like to prevent twisting of the winding foil. Therefore, the structure and assembly of the bearing section are simplified and the cost is reduced. Furthermore, since the rotation is caused by metal-to-synthetic resin contact, there is an advantage that friction is significantly lower than conventional metal-to-metal contact, and the soundproofing effect is also greater.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an enlarged view of the winding wheel bearing of the shutter hoisting device according to the invention, and FIG. 2 is a perspective view showing a metal sleeve that is a component of the same bearing. FIG. 3 is a perspective view showing a synthetic resin bushing, FIG. 4 is a schematic view showing a shutter hoisting device to which this invention is applied, and FIG.
The figure is a partially cutaway front view showing an enlarged view of a conventional foil bearing section. 2... Shaft, 3... Winding foil, 3-1... Bush storage recess, 4... Biasing spring, 5... Metal sleeve, 5-1... Annular convex portion, 6... Synthetic resin Product bushing, 6-1, 6-2, 6-3... Circumferential groove, 11... Shutter case.

Claims (1)

[Scope of utility model registration request] In the shutter hoisting device, a take-up wheel is rotatably attached to a shaft fixed in a shutter case via a bearing, and a biasing spring is attached between the shaft and the wheel. A metal sleeve with an annular protrusion protruding from the outer periphery of the foil bearing portion;
It consists of a half-split synthetic resin bushing with three circumferential grooves on the inner periphery, and a synthetic resin bushing in which the annular protrusion of a metal sleeve fixed to the shaft is fitted onto the inner periphery of the foil. A shutter hoisting device characterized in that the bushing is rotatably fitted in a concave and convex manner in the central circumferential groove of the bushing, and the circumferential grooves on the left and right sides of the bushing are grease grooves.