JPS6324923Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure in which the smoke exhaust port is opened and closed in the axial direction of the outer casing.

The structure of conventional smoke exhaust vents takes into consideration that the negative pressure in the smoke exhaust duct makes it difficult to open the lid, so the negative pressure is offset by the left and right halves that pass through the center of the lid. The lid was pivotally supported by a central shaft installed in the radial direction, and the lid was rotated 90 degrees around the central axis to open and close the smoke exhaust port. However, with this structure, when the lid is opened, the left half of the lid retracts into the outer casing and the right half protrudes to the outside, making the method of sealing the lid complicated when it is closed. Moreover, it was extremely difficult to increase the degree of sealing. Further, when closing the lid body by remote control using an operating line such as a wire, if the operating line moves in and out too much, there is a risk that the operating line may become stuck in the middle, resulting in malfunction.

The present invention solves the problem of negative pressure in the smoke exhaust air duct by making the lid spiral in the axial direction of the outer casing, while simplifying the sealing method of the lid and improving the degree of sealing. At the same time, the present invention aims to provide a smoke exhaust port that operates reliably and has little movement in and out due to operating wires.

The present invention provides a rotation shaft concentrically with the outer casing at the center of the lid that opens and closes the opening of the outer casing, a male threaded portion with a large lead is provided on the rotational shaft, and the male threaded portion is attached to the center of the inside of the outer casing. A first take-up wheel is engaged with the rotating shaft via a spline or the like, and a second take-up wheel is provided on the outer casing or other fixed member. A take-up wire is connected between the take-up wheel and the second take-up wheel, and a spring acting in the direction of opening the lid is installed, and the second take-up wheel is connected to the second take-up wheel by a remote control operation line. an actuating device for moving and releasing the winding wheel; the actuating device is provided coaxially with a second winding wheel and rotating together with the second winding wheel; and a ratchet wheel, and the operating line. A lever is connected to the lever and is provided to rotate coaxially with the ratchet wheel and the second winding wheel, and a locking position that engages with the pawl of the ratchet wheel to lock the rotation of the ratchet wheel. , a holding pawl whose one end side is rotatably provided so as to be separated from the pawl of the ratchet wheel so that it can assume a rotation free position where the pawl is free to rotate; A switching mechanism that switches the holding pawl between a locking position and a free rotation position, and a switching mechanism that is connected to the lever and is not normally engaged with the pawl of the ratchet wheel, but returns the lid to the closed state. In this case, the smoke exhaust port is characterized in that it has a feed pawl provided so as to be engaged with the ratchet wheel so that the ratchet wheel is rotated by rotating the lever.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view of the smoke outlet of the present invention, in which the outer casing 1 is attached to the attachment hole 3 provided in the ceiling wall 2 by a conventional method. A seal receiver 5 is annularly fixed to the inner periphery of a circular opening 4 at the lower end of the outer casing 1, and a seal member 6 made of rubber or the like is attached to the seal receiver 5. Note that the cross-sectional shape of the outer casing 1 may have any shape other than the opening 4.

A base end of a rotating shaft 8 is fixed to the center of a disc-shaped lid 7 that approaches and separates from the sealing member 6 to open and close the opening 4, and the rotating shaft 8 extends concentrically in the axial direction of the outer casing 1. ing. The rotating shaft 8 is provided with a male threaded portion 9 with a large lead, and the male threaded portion 9 is centered inside the outer casing 1, and the support arm 1
The lid body 7 is screwed onto the female threaded cylinder 11 supported by the
support. Further, the rotating shaft 8 is provided with a spline 12, and the first winding wheel 13 is also provided with a spline 14 as shown in FIG. Engage the car 13. In addition to the splines 12 and 14 described above, the means for engaging the first take-up wheel 13 with the rotating shaft 8 is usually a key, a key groove, or a D-shaped cross-sectional shape of the engaging part.
Methods such as forming it into a rectangular shape, an oval shape, etc. can be adopted. The spline 12 is the opening/closing stroke S of the lid body 7
The first take-up wheel 13 is supported on the internally threaded cylinder 11 so that it only rotates in a fixed position and does not move in the axial direction. A cylinder 15 for this purpose is attached onto the female thread cylinder 11, and the first winding wheel 1 is placed on the flange of the cylinder 15.
The surrounding plate 16 is attached with 3 interposed therebetween. Note that the cylinder body 15 can be replaced by extending the female thread cylinder 11, and the structure for holding the first winding wheel 13 in a fixed position can be formed by any other means (for example, see FIG. 6).

Reference numeral 17 denotes a second winding wheel that is pivotally supported on the outer casing 1 and other fixed members, such as the casing of the actuating device to be described later, or the ceiling wall or the airway wall. It is desirable that the second take-up wheel 17 be provided as close to the first take-up wheel 13 as possible, and it is also appropriate that the second take-up wheel 17 has a larger outer diameter than the first take-up wheel 13. A winding wheel 18 such as a wire is connected between the first winding wheel 13 and the second winding wheel 17 via a guide 19 as appropriate. That is, both ends of the winding wire 18 are connected to the first winding wheel 1, respectively.
3 and the second winding wheel 17. The guide 19 is for changing the direction of the winding wire 18 by 90 degrees, and is of course unnecessary if the winding wire 18 can be connected in a straight line.

A spring 20 acts in a direction to open the cover 7, and is attached between the cover 7 and the female screw tube 11. When the second winding wheel 17 is released, the spring 20
The elastic pressure causes the rotating shaft 8 to spiral downward, opening the lid 7 from the opening 4. Therefore, the lead of the male threaded portion 9 of the rotating shaft 8 and the female threaded cylinder 11 is determined so that the elastic pressure of the spring 20 causes the rotating shaft 8 and the lid 7 to spiral. Also, it is determined so that a predetermined opening/closing stroke S is obtained by several rotations of the first winding wheel 13.

Note that 21 is a stopper provided at the upper end of the rotating shaft 8, and 22 is a friction washer of the spring 20. Also, instead of the spring 20, or the spring 2
0 and the mainspring spring 20' as shown in FIG.
may be installed between the first winding wheel 13 and the female threaded tube 11.

FIG. 6 shows another embodiment of the present invention, in which the first winding wheel 13 is mounted on the outer periphery of the female threaded cylinder 11 via a mainspring spring 20' so as to rotate at a fixed position. be.

Next, the second winding wheel 17 is connected to an actuating device 24 for moving and unwinding the second winding wheel 17 by a remote control operation line 23. One embodiment of this actuating device 24 will be described with reference to FIG. 7 and subsequent figures.

That is, the second winding wheel 17 is supported by a shaft 26 on a casing 25 of the actuating device 24, and a mounting line 23 such as a wire is connected to the shaft 26.
A lever 27 with one end tied together is pivotally mounted. The other end of the operating line 23 is connected to a handle 29 which is pivotally supported on the front panel of an operating box 28 as shown in FIG. 11 so as to be vertically movable. In addition, operation line 2
3 is guided and routed by a conduit pipe 30 and an outer tube 31, and is connected to the operation box 2.
Guided by 8. In addition, the lever 27 and the handle 2
A return spring (not shown) is attached to 9.

In more detail with reference to FIGS. 7 to 9, the second take-up wheel 17 pivotally supported by the casing 25 has a ratchet wheel 32; A lever 27 coaxially supported with the lever 17 is a feed pawl 3 for feeding and driving the pawl wheel 32.
It has 3. Furthermore, a holding pawl 34 for holding a ratchet wheel 32 is pivotally attached to the casing 25, and
A slider 35 for releasing the holding claw 34 is slidably provided, and in order to operate the slider 35, a feed claw 33 connected to the lever 27 is disengaged from the ratchet wheel 32, engages with the engagement protrusion 36, and is interlocked with the lever 27. A release cam 37 is pivotally mounted. That is, the release cam 37 is pivotally mounted coaxially with the second winding wheel 17, and has a cam portion 39 on one side that contacts the roller 38 of the slider 35 and slides the slider 35.
, and the above-mentioned engaging protrusion 36 that engages with the feed pawl 33 on the other side, and the feed pawl 33 on the engaging protrusion 36 only when it comes into contact with the winding wire 18 and is tensioned in a straight line. An engagement position setting pin 40 for bringing the engagement protrusion 36 to a position that facilitates engagement.
have. 41, the feed claw 33 is the engagement protrusion 36
This is a cutout groove into which the tip of the feed pawl 33 is inserted to engage with the release cam 37, and is provided in a portion where the other side of the release cam 37 stands up in an arc shape. 42 is a release pin of the feed claw 33 provided on the casing 25;
The engagement protrusion 36 fixed to the release cam 37 approaches the release pin 42 by the return spring 43, and the engagement protrusion 3
When the feed pawl 33 engaged with 6 contacts the release pin 42, the feed pawl 33 is pushed up against the elastic pressure of the holding spring 44 and disengaged from the engagement protrusion 36.

Since a return spring 43 is tensioned on the release cam 37, when the winding wire 18 is loosened, that is, the lid body 7 is moved back to the opening 4 by the spring force of the spring 20, etc.
When it is released, the feed pawl 33 approaches the release pin 42 side, and the gap between the notch groove 41 between the engagement protrusion 36 and the release pin 42 becomes narrower. It becomes difficult to match. 4
Reference numeral 5 designates an elongated hole of an engagement position setting pin 40 provided in the casing 25.

The slider 35 is interposed between the ratchet wheel 32 and the holding pawl 34, and includes a roller 38 that contacts the cam portion 39 of the release cam 37 to move the slider 35 to the left in FIG. roller 46
A cam portion 47 contacts the lever 27 to rotate the retaining claw 34 upward and remove it from the ratchet wheel 32, and a protrusion 48 contacts the lever 27 to return the slider 35 to the right. The above-mentioned release cam 3
7. The slider 35 and the roller 46 constitute the switching mechanism of the present invention. The slider 35 is constructed such that both ends of the slider 35 are slidable by engaging pins 49 protruding from the casing 25 with elongated holes 50 provided in the slider 35, and furthermore, the slider 35 is provided with sliding resistance by a spring 51. 35 from moving left and right without permission.

Thus, in the state shown in FIG. 7, the lid 7 of the smoke exhaust port is closed as shown in FIG. In other words, it is in the set state. In this state, the winding wire 18 is wound on the second winding wheel 17, and therefore, the first winding wheel 13 to which the winding wire 18 is connected rotates in a direction to unwind the winding wire 18, and the spline 12, 14, etc., the rotating shaft 8 ascends while spirally moving inside the internally threaded cylinder 11, and the lid body 7 responds to the elastic pressure (torque) of the spring 20 or 20'. ), it ascends while spirally moving and presses against the sealing member 6, thereby sealing the opening 4 of the outer casing 1. Further, the second take-up wheel 17 has a ratchet wheel 32 engaged with a holding pawl 34 to prevent the second take-up wheel 17 from rotating in the opposite direction. In other words, the lid 7 is prevented from opening due to the force (torque) of the spring 20 or 20'.

On the other hand, the tip of the feed claw 33 is connected to the release pin 42.
Due to the tension of the straight winding wire 18, the engagement position setting pin 40 is released against the pressure of the return spring 43. Rotate the cam 37 slightly upward (to the left diagonally in the figure) until the engaging protrusion 36 is exactly at the position where it will engage the feed pawl 33. Further, the lever 27 having the feed pawl 33 is moved toward the left stopper 5 by the pressure of its return spring (not shown).
2, and the handle 29 of the operation box 28 is rotated upward and closed in FIG.

Next, by slightly pulling down the handle 29 of the operation box 28, the operation line 23 is turned to rotate the lever 27 clockwise. When the lever 27 begins to rotate, the feed pawl 33 first engages with the engagement protrusion 36 of the release cam 37 and moves the release cam 37 towards the lever 2.
Let me accompany you with 7. Therefore, in the initial rotation angle of the lever 27, that is, in the release range α, the release cam 3
The cam portion 39 of No. 7 comes into contact with the roller 38 of the slider 35, as shown in FIG. 8, and moves the slider 35 to the left. Accordingly, slider 35
The cam portion 47 comes into contact with the roller 46 of the holding pawl 34, and the holding pawl 34 is removed from the ratchet wheel 32 in order to rotate the holding pawl 34 upward. Therefore, the ratchet wheel 32 and the take-up wheel 17 are completely free. When the second winding wheel 17 is in the free state in this manner, the rotation shaft 8 and the lid 7 are caused to spirally move due to the elastic pressure (torque) of the spring 20 or 20'. Since the rotating shaft 8 is screwed into the female threaded tube 11 at the center of the interior of the outer casing 1 via the male threaded portion 9 with a large lead, even if the negative pressure passing through the smoke exhaust air duct is applied to the lid 7, The lid body 7 and the sealing member 6 are immediately separated by the elastic pressure (torque) from the spring 20 or 20'.
A small gap is created between the two and the negative pressure is reduced. When the negative pressure decreases, the lid 7 rapidly spirals and descends, reaching a predetermined opening/closing stroke S even after several rotations and opening the opening 4. At this time, the first winding wheel 13 spline-coupled to the rotating shaft 8 winds up the winding wire 18. Note that there is no problem even if the lever 27 is rotated to the return range β following the release range α with the feed pawl 33 and the engagement protrusion 36 engaged, and as described above, the second take-up wheel 17 is rotated. The lock is released.

When the lid 7 is fully opened and the winding wire 18 is loosened, the feed pawl 33 comes into contact with the release pin 42 because the engagement projection 36 approaches the release pin 42 as shown in FIG. 7 when the lever 27 is in its restored position. It is pushed up and removed from the engagement protrusion 36. In order to set the lid 7 again, the operation line 2 must be turned from the open state to the set state.
3 and rotate the lever 27 fully until it contacts the right stopper 53. As soon as the lever 27 begins to rotate, the feed pawl 33 engages with the ratchet wheel 32 as shown in FIG.
, and wind up the winding wire 18 a little. At the same time, push the protrusion 48 of the slider 35 onto the lever 27.
moves the slider 35 to the right, so the roller 46 of the holding claw 34 and the slider 35
The engagement with the cam portion 47 is released, and the holding claw 34
meshes with the ratchet wheel 32. Therefore, lever 27
If you repeat the rotation several times within the return range β,
The ratchet wheel 32 is moved by the action of the feed pawl 33 and the holding pawl 34.
and intermittently rotates the second winding wheel 17 in one direction,
The winding wire 18 is gradually unwound from the first winding wheel 13 and the lid body 7 returns to the set state, that is, the sealed state shown in FIG.

What has been described above is the operation of manual remote control of the actuating device 24, but the actuating device 24 is used simply to move the second take-up wheel 17 up or down as in the above embodiment. In addition to using one operating line 23, the winding movement and unwinding of the second take-up wheel may be performed separately using separate operating lines. Further, even in the case of the above embodiment, the holding claw 34 can be released directly by the releasing cam 37 without using the slider 35. Note that the actuating device 24 is connected to the operating line 23
In addition to the manual opening/closing mechanism, it is equipped with an automatic release mechanism using a solenoid 54. That is, a link 57 having a locking protrusion 56 is connected to a plunger 55 of a solenoid 54 that operates in response to an electric signal from a smoke detector (not shown), etc.
A release lever 60 having a protrusion 58 that engages with the slider 35 and a roller 59 that pushes the right end of the slider 35 is pivoted to the casing 25 by crossing the link 57. Note that 61 is a restoring roller of the release lever 60, which is brought into contact with the lever 27 and restored.
62 is a spring for the release lever 60, which is a spring for the release lever 60;
Acts in the direction of pushing 5. 63 is a return spring for the plunger 55.

Therefore, the plunger 55 of the solenoid 54
When the lever is retracted by excitation, the locking projection 56 of the link 57 is lowered, and the engagement with the projection 58 of the release lever 60 is released. Therefore, the release lever 60 is rotated to the left by the force of the spring 62, and the roller 5
9 to push the slider 35 to the left.
The holding pawl 34 is released as described above.

According to the present invention, as described above, the opening of the outer casing is opened and closed by spirally moving the lid in the axial direction of the outer casing, and moreover, the rotation axis of the lid is connected to a screw with a large lead. Even if negative pressure builds up in the smoke exhaust air duct when the lid is closed, the pressure (torque) of the spring acting in the direction of opening the lid immediately creates a small gap between the lid and the sealing member. A gap can be created to reduce the negative pressure. Therefore, there is no longer any difficulty in opening the lid due to negative pressure in the smoke exhaust air duct, and as a result, the sealing method for the lid becomes extremely simple as described above, and the degree of sealing can be improved. can. Further, the second take-up wheel is connected to the first take-up wheel that drives the rotation shaft of the lid via a take-up line, and therefore the rotation shaft of the lid is driven by the second take-up wheel. This is done by the rotational movement of the Furthermore, the winding movement of the second take-up wheel and the release of rotational locking can be carried out by simply moving a small amount of the operating line connected to the lever of the actuating device having the holding pawl and the feeding pawl as described above. As a result, the movement of the operating wire, which is separate from the winding wire, into and out of the winding wire can be minimized, which not only eliminates the risk of malfunction of the actuating device.
Returning the lid from the open state can be performed extremely easily by simply moving the operating line by a small amount. Also,
The smoke exhaust port according to the present invention creates a certain ventilation gap around the entire circumference of the opening when the lid is open, so smoke floating near the ceiling is inhaled densely and evenly. It can be done quickly. Furthermore, the appearance is far superior to conventional ones.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of the smoke exhaust port according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a rear view thereof, and Figs. 4 and 5 are lines A-A and B of Fig. 1, respectively. - An enlarged sectional view taken along line B, FIG. 6 is a vertical sectional side view showing another embodiment of the smoke exhaust port, FIGS. 7 to 9 are explanatory diagrams of the operation of the actuating device, and FIG. A cross-sectional view of the C line,
FIG. 11 is an exploded perspective view of the operation box. 1: Outer case, 4: Opening, 7: Lid, 8: Rotation shaft,
9: Male threaded portion, 11: Female threaded tube, 12, 14: Spline, 13: First winding wheel, 17: Second winding wheel, 18: Winding line, 20: Spring, 23: Operating line,
24: Actuation device.

Claims (1)

[Claims for Utility Model Registration] A rotating shaft is provided at the center of the lid that opens and closes the opening of the outer casing, coaxial with the outer casing, and a male threaded portion with a large lead is provided on the rotating shaft. A first winding wheel is screwed into a female threaded cylinder supported at the center of the interior of the housing, and a first winding wheel is engaged with the rotating shaft via a spline or the like, and a second winding wheel is provided on the outer housing or other fixed member. , a winding line is connected between the first winding wheel and the second winding wheel, a spring acting in the direction of opening the lid is attached, and the second winding wheel is connected to the second winding wheel by a remote control operation line. , an actuating device for moving and unwinding the second take-up wheel is connected, and the actuating device is connected to a ratchet wheel provided to rotate together with the second take-up wheel, and the operating line is connected to the actuating device. a lever provided to rotate coaxially with the ratchet wheel and the second take-up wheel; a locking position that engages with the pawl of the ratchet wheel to lock rotation of the ratchet wheel; a retaining pawl whose one end is rotatable so that it can take a rotatable free position where it is separated from the pawl of the ratchet wheel and allows the pawl to rotate freely; and a retaining pawl that rotates as the lever rotates. a switching mechanism for switching the lid between a locking position and a free rotation position; A smoke exhaust port characterized by having a feed pawl that is provided so as to be able to engage with a pawl of the ratchet wheel so that the ratchet wheel is rotated by rotating the lever.