JPH0228928Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a slow descent machine that allows evacuees to descend and evacuate at low speed from high places in buildings during emergency evacuations such as fires.

(Prior technology) Generally speaking, this type of slow descent machine is
As shown in Japanese Patent No. 54512 and Japanese Utility Model Publication No. 56-2981, structures equipped with a centrifugal brake are widely known.

That is, as shown in FIG. 4 and FIG.
a shaft 26 installed on the shaft 26, a pulley 27 pivotally connected to the shaft 26, and a centrifugal brake 28 provided on the shaft 26.
, the rope 29 suspended from the pulley 27, and the pulley 2
A planetary gear 30 pivotally supported by 7 and a drum case 2
5, the internal gear 3 meshes with the planetary gear 30.
1 and a planetary gear 3 provided on the centrifugal brake 28.
When the weight of the evacuee is applied to the rope, the pulley is decelerated and rotated by each gear and the centrifugal brake, so that the rope also descends gently and the evacuee is pulled down. The structure allows you to land on the ground.

However, since the braking force of both of the above works only when centrifugal force acts on the centrifugal brake, when the evacuee begins to descend, centrifugal force does not act on the centrifugal brake much. There may be a sudden drop at the beginning. As a result, evacuees may feel a sense of fear during use, or subsequent evacuees may hesitate to descend, posing a safety problem.

Furthermore, the weight of the evacuee on the rope causes a bending load to act on the shaft, which may cause uneven wear on each gear or uneven contact of the brake shoe of the centrifugal brake. However, if you use it many times, the drum case and brake shoes will become more worn. As a result, there was a problem that the braking ability was reduced.

Furthermore, since both use planetary gears, etc., the drum case becomes larger and the overall size increases.
There were also problems in that the weight was considerably heavy, the cost was high, and it was not easy to handle.

(Problems to be solved by the invention) This invention was devised to solve the above-mentioned problems, and its purpose is to improve the braking ability at the beginning of descent and to prevent the deterioration of the braking ability. It is an object of the present invention to provide a slow descent aircraft which can be made small in size and light in weight.

(Means for Solving the Problems) The slow descent machine of the present invention includes a cylindrical sealed container with both ends closed, and a rotating shaft that is inserted into the axial center of the sealed container and rotatably supported. , a stirring blade attached to the rotating shaft located inside the sealed container, multiple balls housed in the sealed container, grease injected into the sealed container, and fixed to one end of the rotating shaft outside the sealed container. It is characterized by consisting of a pulley and a cable of an appropriate length suspended from the pulley.

(Operation) When an evacuee descends, entrusting his body to the cable, the cable rotates the pulley and the rotating shaft due to friction with the outer circumferential surface of the pulley. At this time, the stirring blade receives resistance from the balls and grease, and the rotating shaft and pulley rotate at a low speed from the beginning of rotation. As a result, the rope also descends gently, allowing evacuees to descend safely at low speed without feeling anxious.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a vertical cross-sectional view of a slow descent machine 1 showing an embodiment of the present invention, in which 2 is a closed container, 3 is a rotating shaft, 4 is a stirring blade, 5 is a ball, 6 is grease, 7 is a pulley, 8 is a cable.

The airtight container 2 includes a cylindrical main body 9, a side plate 10 screwed onto the main body 9 to close one end of the main body 9, and a side plate fixed to the main body 9 to close the other end of the main body 9. 11, the main body 9
Sheet packing 12 is adhered to the inner circumferential surface of the housing and the inner surfaces of both side plates 10 and 11. In this embodiment, the inner diameter of the main body 9 is set to 80 mm, and the distance between the side plates 10 and 11 is set to 85 mm.

The rotating shaft 3 is inserted through the axial position of the closed container 2, and is supported by both side plates 10 and 11 via bearing metals 13 so as to be rotatable and immovable in the axial direction.

The stirring blade 4 is attached to the rotating shaft 3 so as to be located inside the closed container 2. That is, in this embodiment, the stirring blades 4 have a substantially fan shape, and are welded to the outer peripheral surface of a cylinder 14 that is externally fixed to the rotating shaft 3 while being inclined at 45 degrees with respect to the axis of the rotating shaft 3.・Four pieces on each side are fixed symmetrically using bolts, etc.

A plurality of balls 5 are stored in the airtight container 2, and in this embodiment, 3000 steel balls with a diameter of 4 mm are stored.
Each contains 1,000 steel balls with a diameter of 3 mm. Further, approximately 130 g of grease 6, such as silicone grease with excellent heat resistance, is injected into the closed container 2.

The pulley 7 is made of plastic,
It is fixed to one end of the rotating shaft 3 outside the airtight container 2 by a pin 15, and has triangular teeth 16 on its outer peripheral surface.
is formed.

The cable 8 is suspended from a pulley 7 and rotates, and in this embodiment, the cable 8 is made of wire rope covered with hemp, cotton, or the like.

In FIGS. 1 and 3, 17 is a disk fixed to one end of the rotating shaft 3, and 18 is a groove 1 on the outer circumferential surface.
9, and is loosely fitted between the disc 18 and the side plate 11 and guides the cable 8 well and reliably. 20 is a set pin 21 on the side plate 11.
A plastic guide roller 23 is pivotally connected to the main body 9 and has triangular teeth 22 on its outer peripheral surface.
The opening 24 is a pin that fixes the cylindrical body 14 to the rotating shaft 3.

The gradual descending machine 1 is disposed at an appropriate location in a high place of a building, and when an evacuee descends by entrusting his body to the rope 8 during an emergency evacuation such as a fire, each guide roller 18, Cable 8 guided by 20
The friction between the pulley 7 and the outer peripheral surface of the pulley 7 causes the pulley 7 and rotating shaft 3 to rotate in the direction of the arrow in FIG. At this time, the rotating shaft 3 and the pulley 7 rotate at a low speed from the beginning because the stirring blade 4 immediately receives resistance from the balls 5 and the grease 6. As a result, the evacuee can safely descend and evacuate at low speed from the beginning of the descent. Since the triangular teeth 16 are formed on the outer circumferential surface of the pulley 7, when the cable 8 rotates, the frictional resistance becomes large and the pulley 7 is reliably rotated. As a result, the rotating shaft 3 is also reliably rotated, and the braking is reliably applied.

In the above embodiment, the substantially fan-shaped stirring blade 4
Eight pieces were attached to the rotating shaft 3 via the cylindrical body 14, but
The present invention is not limited to the above embodiments,
The shape, number, mounting state, etc. of the rotary shaft 3 are arbitrary as long as the rotation speed of the rotary shaft 3 can be reduced by receiving resistance from the balls 5 and the grease 6 during rotation of the rotary shaft 3.

Further, the amount and type of grease 6, the number and diameter of balls 5, etc. are not limited to those in the above embodiments. Any material may be used as long as it provides resistance to the stirring blades 4 and allows the rotating shaft 3 to rotate at a low speed.

In addition, as a result of experiments on the descent speed by applying various loads to the slow descent machine 1, it was found that the said gradual descent machine complies with Article 5 of the Ministerial Ordinance Specifying Technical Standards for Gradual Descend Machines (Descent Speed).
The conditions were satisfied.

(Effect of the invention) As mentioned above, in the slow descent machine of the invention, when the weight of an evacuee is applied to the cable, the rotating shaft and pulley are immediately resisted by the balls and grease on the stirring blades attached to the rotating shaft. Therefore, it will rotate at a low speed from the beginning of rotation. In addition, since the slow descent machine of the present invention is not equipped with a centrifugal brake, there is no possibility that the parts of the centrifugal brake will wear out due to friction and the braking ability will decrease as in conventional slow descent machines. result,
Compared to conventional slow descent planes, the braking ability at the beginning of descent can be increased, and a decline in braking ability can also be prevented, allowing evacuees to safely descend and evacuate without feeling frightened.

Furthermore, since it does not use planetary gears or the like like conventional slow descent machines, the entire machine is smaller and lighter, reducing costs and making it easier to handle.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a gradual descent machine showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, Fig. 3 is a cross-sectional view taken along the - line in Fig. 1, Figs. FIG. 5 is a longitudinal sectional view of a conventional slow descent machine. 1 is a slow descender, 2 is an airtight container, 3 is a rotating shaft, 4 is a stirring blade, 5 is a ball, 6 is grease, 7 is a pulley, and 8 is a cable.

Claims (1)

[Scope of utility model registration request] A cylindrical airtight container 2 with both ends closed; a rotating shaft 3 that is inserted into the axis of the airtight container 2 and rotatably supported; a plurality of balls 5 housed in the sealed container 2; grease 6 injected into the sealed container 2; and a pulley 7 fixed to one end of the rotating shaft 3 outside the sealed container 2; A slow descent machine characterized by comprising a cable 8 of an appropriate length suspended from a pulley 7.