JP2018178961A - Safety device against impact on frost control fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for preventing unintended movement of blades and a frost control fan due to impacts caused by strong wind, thereby avoiding problems such as damage to an oscillating slewing part, blades or teeth of a transmission mechanism, and injury accidents caused by dropping broken or damaged components, cut-off wires, or the like.SOLUTION: A frost control fan comprises a cradle 3 fixed to a pillar, a depression angle base 7, and a fan rotated by a motor. A safety device against impact on the frost control fan restricts random movement of the fan caused by strong wind, by: restricting rotation of the depression angle base 7 by a first safety unit, which comprises a stopper pin disposed on an edge of the cradle 3 and a catcher plate in a curved shape disposed on the depression angle base 7; and restricting rotation of a cap 5 by a second safety unit, which comprises the cap 5 synchronized to a rotating base 4 disposed on the cradle 3, a stopper bolt 35 suspended from the cap 5, and a stopper disposed on the cradle 3.SELECTED DRAWING: Figure 3

Description

  The present invention is, for example, when the anti-frost fan stops or moves, etc., when an impact due to a typhoon or a strong wind or an impact due to a human or other cause or an impact due to a natural disaster occurs. And / or a safety device at the time of an impact of the anti-frost fan which can prevent the anti-frost fan from moving freely (it can have no movement such as suppression, prevention or prohibition).

  Conventionally, the defrosting fan mainly includes a driving motor, a transmission mechanism, a reduction mechanism, a swing transmission mechanism (gear transmission mechanism, link mechanism), and the like. The rotation of the drive motor provided on the frame or the like is transmitted to the depression angle base via the transmission shaft (rotation axis) moved by the link mechanism, and the depression angle base is pivoted to provide the fan motor and blades provided on the depression angle base The fan rotates and, at the same time, the blades are rotated by the blade motor.

  In the above-described anti-frost fan configuration, the following can be considered. For example, if the depression angle base exceeds the allowable swing range (for example, the range of 140 °) due to an impact due to a typhoon, a strong wind, or the like, the swing rotation unit (a drive motor (for a fan (for a fan Damage of the motor) and blades, tooth loss of the transmission mechanism, deterioration of the failure, etc., causing new fatal failure or breakage, cutting of wiring, failure of the entire device, failure or broken parts, There is a problem that the cutting wiring etc. falls and personal injury occurs, etc. Under such circumstances, repair and replacement of the swinging part occur, which is bothersome, and the repair and replacement requires disassembly and repair on the pillars, and the repair is at a high place. It is an operation, and it may be dangerous and difficult, or it may take time, or a personal injury may occur, which is a serious problem.

  In view of the above-mentioned situation, in recent years, a lock device capable of stopping the blade even in the event of an impact is desired.

From the above point of view, the present applicant, for example, attaches a shock absorber to the crank arm as a means for avoiding the crank arm's loss, the tooth loss of the speed reduction mechanism, and the breakage of the drive motor. The document (1) described in Japanese Patent Application Laid-Open No. 2012-172585, which aims to avoid the defects by effects, is proposed. Further, the document (2) described in Japanese Patent Application Laid-Open No. 2014-114779 is proposed, in which the above-mentioned defect avoidance and the self-moving motion of the blade are restricted (impact buffering at the time of strong wind etc.). However, although the invention of document (2) is effective, by further improving it, the device (mechanism) which definitely and surely stops the vanes of the anti-frost fan device (in base angle) in the event of an impact However, these days, it has been requested.

JP, 2012-172585, A JP, 2014-114779, A

  The present invention, for example, aims to avoid situations such as damage or failure due to typhoons, strong winds, etc. and to avoid problems that cause fatal failure or damage etc. The blades and / or the anti-frost fan are self-evident in order to prevent the occurrence of personal injury due to breakage etc. and breakage of related wiring and cutting together with dropping of malfunctioning / damaged parts, cutting wiring etc. Propose a structure that does not move.

  In view of the above, the present invention provides the following claims 1 to 5.

Claim 1 is a defrosting fan constituted by a mount fixed to a building column, a depression angle base rotatably provided to the mount, a motor provided to the depression angle base, and a fan provided to the motor.
A first safety unit comprising a stopper pin provided at an end of the gantry and a catcher plate provided on the depression angle base and exhibiting a curved shape along the rotation locus of the depression angle base, restricts the rotation of the depression angle base Possible,
A crank mechanism provided in the gantry, a rotary table provided in the crank mechanism and provided in the depression angle base, a cap provided in the rotary table, and synchronized with the rotary table, and hanging from the cap A second safety unit comprising a stopper bolt and a stopper provided on the mount makes it possible to regulate the rotation of the cap,
Configuration.

  A second aspect of the present invention is configured such that the cap according to the first aspect is fixed to the rotating table by means of several mounting shafts erected on the rotating table.

A third aspect of the present invention relates to the safety device at the time of impact of the anti-frost fan according to the first aspect, wherein
The first safety unit is provided at a center of an end of the gantry and a stopper pin protruding upward from the gantry, at an end of a rotation locus of the grazing angle base and below the grazing angle base, and both ends A catcher plate is provided with a bent portion bent downward, and a curved shape along the rotation path.

A fourth aspect of the present invention is the safety device at the time of impact of the anti-frost fan according to the third aspect,
The catcher plate is made of a spring steel material.

A fifth aspect of the present invention relates to the safety device at the time of impact of the anti-frost fan according to the first aspect, wherein
The second safety unit comprises a stopper bolt suspended from the inside of a top plate of a cap provided on the depression angle base, and a stopper provided on the gantry and provided on a rotation trajectory of the stopper bolt.

A sixth aspect of the invention relates to the safety device at the time of impact of the anti-frost fan of the third aspect or the fourth aspect.
The catcher plate of the first safety unit includes right and left bent pieces (3101) and (3100) and right and left ends (31a) and (31b), and the right and left bent pieces (3101) and (3100) The stopper bolt of the second safety unit stops the left and right stoppers (37) and (36) after each riding over the stopper pin, and makes it possible to lock the depression angle base. is there.

The invention according to claim 1 is a frost protection fan including a frame fixed to a building column, a depression angle base rotatably provided on the movement frame, a motor provided on the depression angle base, and a fan provided on the motor.
A first safety unit attached between the end of the gantry and the end of the rotation locus of the grazing base is attached, and the gantry, a cap provided on the grazing base, and a cap located on the lower side of the grazing base and It is a safety device at the time of an impact of the anti-frost fan configured to have a second safety unit attached between the rotating table and the rotating table synchronized with the above.

  Therefore, by securing the locked state of the first safety unit and the second safety unit, for example, the shock transmission of the anti-frost fan by shock due to a typhoon, strong wind, etc., or another shock (assumed as a typhoon, strong wind, etc.) If the mechanism is damaged or broken, the self-acting movement of the blade is restricted (the swing and swing unit secures a structure that does not exceed the allowable range of the swing), and deterioration and damage such as failure and new fatality Work in height, combined with work such as repair / replacement of the swing and swivel part, and, in addition, work to prevent the occurrence of personal injury due to the fall of broken or damaged parts or cut wiring etc. It has features such as elimination and prevention of personal injury.

  In the invention of claim 2, the cap according to claim 1 is configured to be fixed to the mount by means of several attachment shafts provided upright on the rotary table.

  Therefore, in order to achieve the object of claim 1, it is possible to propose a structure which shows the optimum relationship between the mounting shaft and the mount.

The invention according to claim 3 is the safety device at the time of impact of the defrosting fan according to claim 1;
The first safety unit is provided at the center of the end of the gantry and at the end of the rotation locus of the wedge base based on the stopper pin projecting upward from the gantry and below the wedge base and both ends are folded downward. It is a safety device at the time of an impact of the anti-frost fan comprising a bent portion and a catcher plate having a curved shape along the rotation path.

  Therefore, in order to achieve the object of claim 1, it is possible to propose an optimal structure of the first safety unit.

The invention of claim 4 relates to the safety device when a defrost fan according to claim 3 is subjected to an impact,
The catcher plate is made of spring steel.

  Therefore, in order to achieve the object of claim 1, it is possible to propose an optimal material for the first safety unit.

The invention according to claim 5 is the safety device upon impact of the anti-frost fan according to claim 1;
The second safety unit includes a stopper bolt suspended from the inside of the top plate of a cap provided on the base, a rotary base provided on the rack and on which the cap is fitted, a rotary base, and a rotation locus of the stopper bolt. And a pair of stoppers.

  Therefore, in order to achieve the object of claim 4, it is possible to propose an optimal second safety unit structure.

The invention of claim 6 relates to the safety device at the time of impact of the defrosting fan according to claim 3 or 4.
The catcher plate of the first safety unit comprises right and left bent pieces (3101) and (3100) and right and left ends (31a) and (31b), and the right and left bent pieces (3101) and (3100) are After passing over the stopper pin, the stopper bolt of the second safety unit stops the left and right stoppers (37) and (36) to lock the depression angle base.

  Therefore, in order to achieve the object of claim 1, it is possible to propose the optimum structure of the catcher plate of the first safety unit and the stopper / stopper bolt of the second safety unit.

A perspective view showing the whole of the anti-frost fan Side view showing the whole of the anti-frost fan An enlarged cross-sectional view for explaining the relationship between a rotary shaft erected on a crank mechanism (to be described later) of a gantry, a rotating table, a cap, and a depression angle base Enlarged schematic diagram of 45 ° right swing with anti-frost fan swinging within 90 ° For example (in the following abbreviation), the anti-frost fan swings in the range of 90 °, the enlarged schematic diagram of the state where it is shaken 45 ° on the left side An enlarged schematic diagram showing the state in which the swing and swivel unit is stopped outside the swing and swing range and locked at the 70 ° swing on the right side in an abnormal state, and the anti-frost fan is abnormal. (A) is the main part, catcher A schematic drawing of the plate taken out and a schematic drawing of the main part of the plate with the catcher plate and the stopper pin taken out The expansion schematic diagram which showed the state which the swing rotation part has stopped outside the swing rotation range and is locked by the 70 degreeC swing on the left side in the abnormal condition in a frost protection fan abnormal condition. A schematic diagram showing the relationship between the first safety unit and the second safety unit with the anti-frost fan swinging in the range of 90 ° and swinging to the center (center of the frame) A schematic view showing the relationship between the first safety unit and the second safety unit in a state where the antifreeze fan swings 45 ° on the left side while swinging in a range of 90 ° (corresponding to FIG. 4) The relationship between the first safety unit and the second safety unit was shown in a state where the anti-frost fan was abnormal and the swing and swivel unit stopped outside the swing and swing range and locked with 70 ° swing on the left side Schematic diagram (corresponding to FIG. 7) A schematic view showing a relationship between the first safety unit and the second safety unit in a state where the anti-frost fan swings 45 ° on the right side while swinging in the range of 90 ° (corresponding to FIG. 5) The relationship between the first safety unit and the second safety unit was shown when the antifreeze fan was abnormal and the swing and swivel unit stopped outside the swing and swing range and was locked with the right 70 ° swing. Schematic diagram (corresponding to FIG. 6)

  A is a frost protection fan, and this frost protection fan A is, for example, a cylinder 2 (one example, hereinafter the other parts are also the same) to be fitted to the building column 1 provided in the field. A substantially bowl-shaped gantry 3 supported thereon, a crank mechanism 15 to be described later provided on the gantry 3, a rotary shaft 16 to be described later, a rotary table 4 provided on the upper side of the rotary shaft 16, and screwing on the rotary table 4 The mounting shaft 6 is mounted on and fixed to the rotating table 4 and fixed to the cap 5 by means of welding or the like, and is provided on the frame 3 so as to be rotatable (pivotable). , The motor base 8 provided over the depression angle base 7 and provided to adjust the depression angle, the fan drive motor 9 provided on the top plate of the motor base 8, and the output shaft of the motor 9 It comprises with the blade | wing 10 (fan) provided in 9a.

  The cylindrical body 2 and the gantry 3 are provided with a mechanism for rotating a rotation table 4 described later. For example, a drive motor 11 provided (embedded) in the gantry 3 and / or the cylinder 2 and a transmission mechanism 12 provided in the gantry 3 consisting of a gear group for transmitting the rotational force from the motor 11 A reduction gear mechanism 13 provided in the gantry 3 which is a gear group for decelerating the rotational force of the transmission mechanism 12, and a crank mechanism 15 provided in the horizontal direction in the gantry 3 for changing the rotation of the reduction gear mechanism 13 into crank motion. , As the main configuration. To explain the movement and linkage of the mechanism, the rotational force of the drive motor 11 is transmitted to the transmission mechanism 12 and the reduction mechanism 13 and transmitted in a decelerating manner. The rotation decelerated by the reduction mechanism 13 is converted into crank motion by the crank mechanism 15. Then, the rotation shaft 16 is rotated (reciprocated motion “predetermined range turning”) by transmitting to the rotation shaft 16 vertically provided at the tip end of the crank mechanism 15. Through this reciprocation motion, the reed angle base 7 is reciprocated as described later (based on the swing motion of the anti-frost fan). The reciprocating motion of the rotating shaft 16 is transmitted to the rotating table 4 fixed to the upper portion of the rotating shaft 16. The rotation (reciprocation movement “predetermined range rotation”) of the rotation table 4 is transmitted to the cap 5 which is fixed to (is fitted to) the rotation table 4 and synchronously rotates (reciprocation movement “predetermined range rotation”). Therefore, the rotation of the cap 5 is transmitted to the wedge base 7 fixed to the cap 5 by means of welding or the like (installed at a distance on the base 3) and pivots the wedge base 7 (a predetermined range Swing movement in Then, the turning movement of the depression angle base 7 is transmitted to the motor base 8 fixed to the depression angle base 7. And as a result, it becomes the motive power of swinging movement (swinging movement) of the blade | wing 10 provided in the motor base 8. FIG.

  The relationship between the crank mechanism 15 provided in the gantry 3, the rotary shaft 16 erected on the crank mechanism 15, the rotary table 4, the cap 5, and the depression angle base 7 will be described. The enlarged sectional view shown in FIG. 3 In the rotary shaft 16 erected at the tip of the crank mechanism 15 (the end toward the right in FIG. 2) and supported by bearings 40 provided on the upper surface (top plate) of the gantry 3 The rotating table 4 is supported at the end of the shaft reaching the base 7. A cap 5 is fitted on the rotary table 4 and fixed via a plurality of mounting shafts 6 (described later), and the cap 5 synchronizes with the rotary table 4. The cap 5 is inserted into a hole (not shown) in the bottom plate 7 a of the scoop base 7, and the side wall of the cap 5 is welded and fixed to the scoop base 7. Thus, the depression angle base 7 is horizontally supported by the cap 5 and synchronized with the rotating table 4. In other words, the cap 5 is configured to rotate in synchronization with the rotation of the rotation shaft 16 when the rotation mechanism 16 rotates and the crank mechanism 15 is movable. In the figure, reference numeral 50 denotes a cover which is press-fit to the cap 5. The cover 50 is fitted from above the cap 5 and is press-fitted to the cap 5. For example, it is intended to prevent rainwater Made of plastic. Further, it is desirable that the cover 50 be separated from the surface 7a1 of the bottom plate 7a of the depression angle base 7, for example. As in this example, the resin cover 50 and / or separation is advantageous for replacement at failure and for rainwater.

  The structure of the first safety unit B provided on the turntable 4 and the cap 5 and the gantry 3 will be described. The first safety unit B includes a stopper pin 30 having a head 30a and a constriction, which are at the center 3b of the end 3a at the tip of the gantry 3 in the rotational direction and projecting upward 3c from the gantry 3; The same curved position as that of the rotation locus C, and provided on the back surface 7a2 of the bottom plate 7a of the depression angle base 7, and provided with bent portions 3100 and 3101 which both end portions 31a and 31b (right and left end portions) are bent downward. And a catcher plate 31 having a curved shape along the rotation locus C. Therefore, when the anti-frost fan A is in a normal state, as shown in FIGS. 4 and 5, the head 30a of the stopper pin 30 is formed between the flat portion 31c of the catcher plate 31 (between the bent portions 3100 and 3101) It is a curved flat portion, and this curved surface is the same curved surface as the rotation locus C), and derives the distance of the curved surface shape of the flat portion 31c. Under this guidance, the depression angle base 7 is configured to swing, for example, in the range of 90 °. In addition, while swinging in the range of 90 °, in the swing state of 45 ° in the right and left, spaces H and H1 are provided between the stopper and the stopper bolt described later. The spaces H and H1 ensure the emergency movement of the catcher plate 31 when the blade 10, which will be described later, moves freely, and the state of emergency stop of the bent portions 3100 and 3101 of the catcher plate 31 and the stopper pin 30. It is necessary for The emergency stop release is performed using the flexibility of the catcher plate 31 (the other locks are the same).

  In addition, the structures of the turntable 4 and the cap 5 and the second safety unit D provided on the gantry 3 will be described. The second safety unit D is provided on a stopper bolt 35 suspended from the top plate 5 a of the cap 5 provided at an upper portion 3 c of the gantry 3 at a distance, and provided on the gantry 3. And a pair of stoppers 36 and 37 provided on the reciprocating side (see FIGS. 4 and 5). Therefore, when the anti-frost fan A is abnormal, it is locked as shown in FIG. 6 and FIG. As shown in FIG. 6, when the swing and pivot portion is out of the swing and swing range and is stopped in the right 70 ° swing state, the stopper bolt 35 is locked against the stopper 37. Further, as shown in FIG. 7, when the swing and pivot portion is out of the swing and swing range and stops in the state of 70 ° swing on the left side, the stopper bolt 35 is locked against the stopper 37 . The unlocking is performed using the flexibility of the catcher plate 31 (the other locks are the same).

  Next, referring to FIGS. 8 to 12, the movement of the anti-frost fan A (rotary table 4, catcher plate 31, stopper bolt 35), the stopper pin 30, and the stand 3 were erected (around the rotary shaft 16) And, the relationship between the stoppers 36 and 37) erected on the top plate 3d of the gantry 3 and the stop of the blade 10 at the time of strong wind and the like will be described. "I" to "H" will be sequentially described.

  "I" In the state of FIG. 8, the anti-frost fan A shook to the center (in the middle 3b of the gantry 3 "in plan view in FIG. 8") while swaying in the range of 90 ° It is a state. The relationship between the first safety unit B (catcher plate 31 and stopper pin 30) and the second safety unit D (stopper bolt 35 and stoppers 36 and 37) in this state will be described. While the stopper pin 30 is positioned, the stopper bolt 35 is positioned between the right and left stoppers 36 and 37. In other words, the anti-frost fan A is in a normal state and in the middle 3b.

  “R” The state in FIG. 9 is a state where the anti-frost fan A swings 45 ° on the left side while swinging in the range of 90 °. In this state, the stopper pin 30 is positioned at the left end of the flat portion 31c of the catcher plate 31, and the stopper bolt 35 is positioned to secure the space H1 with respect to the stopper 37 on the left side. In other words, the anti-frost fan A is in a normal state, and swings to the left (is swinged to become “B” after “B”).

  In the state of FIG. 10, the anti-frost fan A is damaged or broken, for example, in the direction (for example, shock due to a typhoon, strong wind, etc., or another impact) In the case where the swing and turn unit is subjected to an impact due to a typhoon, a strong wind or the like, or another impact, an abnormal situation exceeding the swing allowable range “for example, the range of 140 °” occurs. Alternatively, when the rotary table 4 is pressed in the direction B, the bent portion 3100 of the catcher plate 31 gets over the stopper pin 30, and the left end 31b (one side, the left side in FIG. 7) Of the right side 30c (upper side in FIG. 9 in FIG. 9). On the other hand, the stopper bolt 35 stops on the left side stopper 37 (a second stop). In the first and second restraints, the space H1 shown in FIG. 9 disappears. The stopper bolt 35 and the catcher plate 31 move in the low direction Y by the space H1 (distance), and the left end 31b of the catcher plate 31 is engaged with the right side 30c of the stopper bolt 30. Therefore, the depression angle base 7 or the rotating table 4 is restricted by the first and second restraints, whereby self-directed movement due to impact such as strong wind, wind, and breakage is restricted. In addition, there is a feature similar to the above-mentioned, which is useful for the elimination of the harmful effect due to the free movement. For example, by controlling the depression angle base 7 or the rotating table 4 by the first and second restraints, the free movement of the blades and the like due to an impact such as a typhoon or a strong wind is restricted. As a result, it is possible to avoid the deterioration such as damage or failure, and new fatal failure or damage. Disconnection of wiring, failure of the entire device, and broken or damaged parts, cut off wiring, etc. can be avoided, thus preventing personal injury.

  [D] The state in FIG. 11 is a state in which the anti-frost fan A swings 45 ° on the right side while swinging in a range of 90 °. In this state, the stopper pin 30 is positioned at the left end of the flat portion 31c of the catcher plate 31, and the stopper bolt 35 is provided with a space H with respect to the right stopper 36 (one side, right side in FIG. 6). Position secured. In other words, the anti-frost fan A is in a normal state and swings to the right (from “b” to “b”).

  “H” The state shown in FIG. 12 is that the anti-frost fan A is, for example, in the direction a (for example, the shock transmission mechanism of the anti-frost fan A is damaged or broken In this case, if the swing and swivel unit is subjected to an impact due to a typhoon, a strong wind or the like, or another impact, an abnormal situation exceeding the swing tolerance range “for example, the range of 140 °” occurs. When the rotary table 4 is pressed in the direction a, the bent portion 3101 of the catcher plate 31 gets over the stopper pin 30, and the right end 31a of the catcher plate 31 (one side, left side in FIG. 6) Butts against the constriction of the left side 30b of the stopper pin 30 (the lower side in the drawing in FIG. 11) (a third stop). On the other hand, the stopper bolt 35 stops on the right side stopper 36 (a fourth stop). The third and fourth restraints are shown in FIG. 12 and the space H shown in FIG. 11 disappears. That is, while the space H (distance), the stopper bolt 35 and the catcher plate 31 move in the a direction X, the right end 31 a of the catcher plate 31 stops on the left side 30 b of the stopper bolt 30. Therefore, the depression angle base 7 or the rotating table 4 is restricted by the third and fourth restraints, whereby self-directed movement due to impact such as strong wind, wind, and breakage is restricted. In addition, there is a feature similar to the above-mentioned, which is useful for the elimination of the harmful effect due to the free movement. Others conform to the first and second bans described above.

  The present invention is not limited to the above-described embodiments, and a structure in which a part of the configuration is changed within the scope of the invention, a structure capable of achieving the same features and effects, etc. It is a category.

DESCRIPTION OF SYMBOLS 1 building column 2 cylinder 3 base 3a end 3b middle 3c upper 3d top plate 4 rotary table 5 cap 5a top plate 6 attachment shaft 7 angle base 7a bottom plate 7a1 front surface 7a2 back surface 8 motor base 9 motor 9a output shaft 10 blade 11 motor 12 Transmission Mechanism 13 Reduction Mechanism 15 Crank Mechanism 16 Rotating Shaft 22 Cap 30 Stopper Pin 30a Head 30b Left 30c Right 31 Catcher Plate 31a Right End 31b Left End 31c Flat Part 3100 Folded Part 3100 Folded Part 35 Stopper Bolt 36 Stopper (right side)
37 Stopper (left side)
40 Bearing 50 Cover A Anti-Defrosting Fan B Primary Safety Unit C Rotational Trajectory D Secondary Safety Unit E Rotational Trajectory H Space H1 Space

Claims (6)

In a frost protection fan constituted by a mount fixed to a building column, a depression angle base rotatably provided to the mount, a motor provided to the depression corner base, and a fan provided to the motor
A first safety unit comprising a stopper pin provided at an end of the gantry and a catcher plate provided on the depression angle base and exhibiting a curved shape along the rotation locus of the depression angle base, restricts the rotation of the depression angle base Possible,
A crank mechanism provided in the gantry, a rotary table provided in the crank mechanism and provided in the depression angle base, a cap provided in the rotary table, and synchronized with the rotary table, and hanging from the cap A second safety unit comprising a stopper bolt and a stopper provided on the mount makes it possible to regulate the rotation of the cap,
Safety equipment at the time of impact of the anti-frost fan which has a different configuration.
The safety device at the time of an impact of the anti-frost fan constituted that a cap according to claim 1 is fixed to the rotating table by a plurality of mounting shafts erected on the rotating table.
In the safety device at the time of impact of the anti-frost fan according to claim 1,
The first safety unit is provided at a center of an end of the gantry and a stopper pin protruding upward from the gantry, at an end of a rotation locus of the grazing angle base and below the grazing angle base, and both ends The safety device at the time of an impact of the anti-frost fan comprising a bent portion bent downward and a catcher plate having a curved shape along the rotation path.
In the safety device at the time of impact of the anti-frost fan according to claim 3,
The safety device at the time of impact of the anti-frost fan which comprises the catcher plate from spring steel material.
In the safety device at the time of impact of the anti-frost fan according to claim 1,
The second safety unit is a frost protection fan constituted of a stopper bolt suspended from the inside of a top plate of a cap provided on the depression angle base, and a stopper provided on the gantry and provided on a rotation trajectory of the stopper bolt. Safety device during impact.
In the safety device at the time of impact of the anti-frost fan according to claim 3 or claim 4,
The catcher plate of the first safety unit includes right and left bent pieces (3101) and (3100) and right and left ends (31a) and (31b), and the right and left bent pieces (3101) and (3100) And the stopper bolt of the second safety unit stops the left and right stoppers (37) and (36) after each riding over the stopper pin, so that the depression angle base can be locked. Safety device at the time of impact of the frost protection fan.