KR102366053B1 - Foldable agitator having a highly efficient hub - Google Patents

Abstract

Disclosed is a foldable agitator having a highly efficient hub. According to an embodiment of the present invention, a foldable agitator comprises: a central hub including, in a lateral portion, a slot opened to the outside, and including a pair of coupling flanges formed on both sides of the slot; and a blade arm having a coupling end formed on one side thereof and inserted into the slot, being coupled to the pair of coupling flanges. Here, the blade arm can include an end protrusion formed on one side of the coupling end and having a width greater than that of the coupling end. The slot can include a narrow portion having a first width and a wide portion having a second width greater than the first width. The end protrusion can have a width greater than the first width. According to one embodiment of the present invention, provided is the foldable agitator, which can maintain the same strength and have a smaller volume and weight by the central hub, thereby being structurally stable and providing higher operating efficiency.

Description

FOLDABLE AGITATOR HAVING A HIGHLY EFFICIENT HUB

The present invention relates to a folding stirrer, and more particularly, to a folding stirrer having a hub of structural stability and high operating efficiency.

Agitator refers to a device for mixing a fluid or slurry inside the stirring tank, also referred to as an impeller. Agitation of the fluid or slurry can be used to prevent sedimentation of substances, suppress floc formation, and uniformly mix materials, and is used in various fields such as sewage and wastewater treatment, compost production, and pharmaceutical manufacturing.

The agitator generally includes a rotating shaft elongated into the stirring tank and a central hub rotating by the rotating shaft at the lower end thereof to rotate a plurality of blades. A folding agitator has been developed for the convenience of installation and dismantling. In the folding agitator, the blade arm on which the blade is mounted is installed to rotate with respect to the central hub, and the position where the blade is folded according to the movement of the piston inside the central hub Alternatively, the blade arm is rotated to the unfolded position.

In the folding stirrer according to the prior art, the portion in contact with the blade arm in the piston is horizontal, and since the piston does not strongly restrain the blade arm, the blade arm and the blade mounted thereon are easily moved by external force. That is, when the piston is disposed at a specific height, the blade arm and the blade should be fixed at a specific position corresponding to the height of the piston, but this fails and is shaken by a small external force. When the agitator is operated, the blade of the agitator may apply a very large fluid resistance. If the blade arm is not firmly fixed at the designed position, the operating efficiency of the agitator is inevitably reduced.

On the other hand, the force applied to the blade by the operation of the agitator also affects the coupling portion of the blade arm and the central hub, and after long-term use, the bolts that connect the blade arm may be damaged or separated due to wear and vibration, etc. . If the blade arm and the blade are separated from the central hub inside the stirring tank, it may be very inconvenient to collect them. In particular, if the blade arm and the blade are separated during the operation of the stirrer, this may cause great damage to the stirring tank or other stirrers, and there is also a risk of safety accidents.

Accordingly, the present invention has been derived to solve the above-described problems, and an aspect of the present invention is to provide a folding stirrer that is structurally stable and can provide higher operating efficiency.

Other objects of the present invention will become clearer through the examples described below.

A foldable stirrer according to an aspect of the present invention includes: a central hub including a slot that is opened to the outside at a side and a pair of coupling flanges formed on both sides of the slot; and a blade arm having a coupling end formed on one side inserted into the slot and configured to be coupled to the pair of coupling flanges, wherein the blade arm is formed on one side of the coupling end and is larger than the width of the coupling end. It may include an end protrusion having a width, and the slot may include a narrow portion having a first width and a wide portion having a second width greater than the first width, wherein the end projection is greater than the first width can have a width.

The folding stirrer according to the present invention may have one or more of the following embodiments. For example, the collapsible stirrer may further include a piston that is accommodated in an accommodating space inside the central hub to be movable between an ascending position and a descending position and includes a pressure protrusion located in the slot, wherein the blade arm is may be rotatably coupled to the coupling flange, and the pressure protrusion may contact the end protrusion and the angle of the blade arm with respect to the central hub may be changed as the piston moves within the accommodation space, and the blade When the arm is rotated, the end protrusion may be configured to move within the wide portion.

The pressing protrusion may include a locking surface inclined downwardly to the outside on its lower surface or a locking surface inclined upwardly toward the outside on its upper surface.

The central hub may include a plurality of body members spaced apart from each other to form the slot and having the coupling flanges formed at both ends and a deck extending between coupling flanges at both ends of the body member, the outer side of the body member The surface may form a flat plane.

In this case, the deck extends toward the coupling flange of the other end of the body member after extending a predetermined distance from the coupling flange of one end of the body member in the opposite direction to the rotational direction of the foldable stirrer, and one end adjacent to the coupling flange of one end of the body member A support stub can be formed on the When the deck is an upper deck connecting the upper portions of the coupling flanges of both ends to each other, a platform protruding a predetermined height upward may be formed on one side of the deck, and the platform is a predetermined side on one side facing the coupling flanges of the adjacent end. It may include an inclined support surface inclined at an angle of.

The blade arm may further include a blade mounting portion bent at an obtuse angle with respect to the coupling end and extending in a direction different from the direction in which the blade mounting portion is bent at the intersection of the coupling end and the blade mounting portion. there is.

According to the problem solving means of the present invention as described above, various effects including the following items can be expected. However, the present invention is not established only when all of the following effects are exhibited.

According to an embodiment of the present invention, a folding stirrer that is structurally stable and can provide higher operating efficiency by allowing the central hub to have a smaller volume and smaller weight while maintaining the same strength is provided.

According to an embodiment of the present invention, there is provided a folding stirrer capable of increasing safety and convenience of use by preventing the blade arm from being easily separated even if the coupling member connecting the blade arm to the coupling flange is damaged or separated.

According to an embodiment of the present invention, there is provided a foldable stirrer capable of providing higher operating efficiency by receiving less influence from external force by more firmly constraining the pressure protrusion of the piston to the end protrusion of the blade arm.

1 is a perspective view illustrating a state in which one blade arm is coupled to a central hub of a foldable stirrer according to an embodiment of the present invention.
2 is a side view illustrating a blade arm of a folding stirrer according to an embodiment of the present invention.
3 is a perspective view illustrating a blade arm of a folding stirrer according to an embodiment of the present invention.
4 is a side view illustrating a central hub of a foldable stirrer according to an embodiment of the present invention.
5 is a plan view illustrating a central hub of a foldable stirrer according to an embodiment of the present invention.
6 and 7 are side views illustrating the relationship between the blade arm and the piston of the folding stirrer according to an embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numbers regardless of reference numerals, and overlapping A description will be omitted.

1 is a perspective view illustrating a state in which one blade arm 400 is coupled to a central hub 300 of a foldable stirrer according to an embodiment of the present invention.

The folding stirrer according to an embodiment of the present invention may include a rotating shaft (not shown), a central hub 300 , a blade arm 400 , a blade (not shown) and a piston 500 . The folding stirrer may be installed in the stirring tank (not shown) in such a way that the central hub 300 is connected to the rotating shaft (not shown).

For reference, as a blade applicable to the stirrer, a wide variety of shapes have already been known, and since the technical idea of the present invention is not in the shape of the blade, only the blade arm 400 is shown while the blade is omitted in the drawing. . Of course, a blade may be mounted on the blade arm 400 , and the blade arm 400 itself may be a part of the blade.

In the present specification, for convenience of description, it is assumed that the foldable stirrer includes three blades, and accordingly, a case in which the slot 350 and the blade arm 400 are also provided three each is illustrated as an example. Of course, the present invention is not limited by the number of blades, and may include two or more blades, and it is also possible to include only one blade.

The rotating shaft (not shown) may be coupled to the central hub 300 and may have an empty inside. The rotating shaft may be rotated by a separate driving unit, and may transmit rotational force to the central hub 300 . A separate rod (not shown) for coupling to the piston 500 may be accommodated in the empty space inside the rotary shaft. As used herein, the term “coupled” includes cases in which individual members are joined or connected to each other, as well as cases in which parts referred to by individual names are formed as one integral member.

The central hub 300 is a portion to which the blade arm 400 and the blade (not shown) are coupled, and as the central hub 300 is rotated by a rotating shaft (not shown), the blade arm coupled to the central hub 300 . 400 and the blade (not shown) may also be rotated to perform a stirring operation. An accommodating space 305 accommodating the piston 500 may be formed inside the central hub 300 , and a slot 350 communicating with the accommodating space 305 may be formed on the side of the central hub 300 . there is.

The slot 350 may be opened to the outside, and coupling flanges 320 may be formed on both sides of the slot 350 . In the drawings, the slots 370 and 375 between the pair of coupling flanges 320 are distinguished from the slots 360 and 365 formed between the body members 310 of the central hub 300, and reference numbers are indicated differently, but this For convenience of description, all of them may be viewed as a part of the slot 350 . The structure of the central hub 300 and the slot 350 will be described later in more detail.

The blade arm 400 may include a coupling end 410 , an end protrusion 420 , a blade mounting portion 430 , and a reinforcing portion 450 . The coupling end 410 of the blade arm 400 may be rotatably coupled between the pair of coupling flanges 320 , and for this purpose, a coupling hole 480 may be formed. In the drawings, a case in which a pair of coupling flanges 320 are formed on both sides of the slot 350 for each slot 350 and the blade arm 400 is coupled to the coupling flanges 320 on both sides is illustratively depicted. , it is also possible if the coupling flange 320 is formed only on one side of the slot 350 and each blade arm 400 is coupled to one coupling flange 320 . The blade arm 400 may be coupled to the coupling flange 320 by a separate coupling member (not shown). For example, bolts, rivets, etc. may be inserted into the coupling holes 380 and 480 of the coupling flange 320 and the blade arm 400 to couple the blade arm 400 to the coupling flange 320 . Of course, various well-known structures may be applied to rotatably coupling the blade arm 400 to the coupling flange 320 . The structure of the blade arm 400 will be described later in more detail.

The piston 500 may be accommodated in the receiving space 305 of the central hub 300 and configured to move between an ascending position and a descending position. To this end, the aforementioned rod (not shown) may be coupled to the piston 500 , and the rod (not shown) applies force to the piston 500 to raise or lower the piston 500 so as to be disposed in the rising or falling position. can do it

Hereinafter, the central hub 300, the blade arm 400, and the piston 500 of the foldable stirrer according to an embodiment of the present invention will be described in more detail with reference to FIGS. 2 to 7 .

2 and 3 are a side view and a perspective view illustrating a blade arm 400 of a folding stirrer according to an embodiment of the present invention, and FIGS. 4 and 5 are a central hub ( 300) is a side view and a top view. 6 and 7 are side views illustrating the relationship between the blade arm 400 and the piston 500 of the folding stirrer according to an embodiment of the present invention.

2 and 3 , the blade arm 400 may include a coupling end 410 , an end protrusion 420 , a blade mounting portion 430 , and a reinforcing portion 450 . As described above, a coupling hole 480 may be formed in the coupling end 410 , and a separate coupling member (not shown) is formed between the coupling hole 480 of the coupling end 410 and the coupling flange 320 on both sides. By passing through the coupling hole 380 , the blade arm 400 may be rotatably coupled between the coupling flanges 320 .

The end protrusion 420 may be formed at one corner of the coupling end 410 , and the end protrusion 420 may be formed to have a width greater than the width of the coupling end 410 . More specifically, the end protrusion 420 may be formed on the lower inner side of the coupling end 410 as shown in FIG. 2 . In the description of the blade arm 400 or a portion of the blade arm 400 in this specification, referring to the inner and outer sides, upper and lower portions, is based on a state in which the blade arm 400 is fully folded. That is, in FIG. 2, "inside" corresponds to the right side of the figure, and "lower" corresponds to the lower part of the figure.

Since the end protrusion 420 has a greater width than the coupling end 410 , the end protrusion 420 may protrude on both sides of the coupling end 410 , and the coupling end 410 has the protrusion of the end protrusion 420 . A tapering portion 425 leading to a gentle slope from one portion toward the side of the coupling end 410 may be formed. The tapering portion 425 may serve to reinforce the periphery of the end protrusion 420 , and the protruding portion of the end protrusion 420 may form a step to prevent excessive force from being concentrated.

A spare groove 470 may be formed in a portion adjacent to the end protrusion 420 in the coupling end 410 . The spare groove 470 is formed so that the coupling end 410 does not interfere with the pressing protrusion 540 of the piston 500 when the blade arm 400 rotates. Therefore, the spare groove 470 is based on the rotation axis of the blade arm 400 (that is, the position of the coupling hole 480) when the pressing protrusion 540 moves up and down and the blade arm 400 rotates correspondingly. In consideration of the change in the relative position of one pressing protrusion 540, it may be formed in a streamlined shape.

The blade mounting portion 430 corresponds to a portion bent at an obtuse angle with respect to the coupling end 410 and extended, and may be a portion on which a blade (not shown) used for actual stirring is mounted or a portion of the blade itself. In the drawings, the direction in which the blade mounting part 430 is bent with respect to the coupling end 410 is depicted in a direction corresponding to the direction in which the foldable stirrer is rotated (hereinafter, "rotation direction"), but the present invention is not limited thereto. .

2, one or more mounting holes 435 for mounting a blade (not shown) may be formed in the blade mounting unit 430, and also formed at a right angle to the blade mounting unit 430, the blade mounting unit ( A buttress 440 may be formed to increase the structural strength of 430 .

The reinforcing part 450 may extend in a direction different from the bending direction of the blade mounting part 430 at the intersection of the coupling end 410 and the blade mounting part 430 . The outer side of the reinforcing part 450 may have a chamfered shape. Due to this, when the blade arm 400 is in a fully contacted state, the reinforcing part 450 may not form a sharp edge toward the outside as shown in FIG. 1 .

On the other hand, the inner side facing the central hub 300 from the reinforcing part 450 may have a shape in which the lower part is cut along the inclined surface to form the inclined support surface 460 inclined at a predetermined angle. When the blade arm 400 is in full contact, the inclined support surface 460 of the reinforcing part 450 is on the inclined support surface 336 of the upper deck 330 of the central hub 300 to be described later, as shown in FIG. 1 . can be mounted on

For reference, in this specification, saying that a component has a “chamfered shape” or “cut shape” is only an expression for describing the shape, and indicates that the component is actually manufactured by a chamfering or cutting process. It's not meant to be.

The central hub 300 may have an accommodating space 305 therein and a plurality of slots 350 on the side as described above. The central hub 300 may include a plurality of body members 310 having coupling flanges 320 formed at both ends thereof, and adjacent body members 310 may be spaced apart from each other to form a slot 350 . That is, in the two adjacent body members 310, the coupling flange 320 formed on the right side of the left body member 310 and the coupling flange 320 formed on the left side of the right body member 310 form a pair and correspond The blade arm 400 may be coupled to the position. In the example shown in the drawings, three main body members 310 are connected to each other at the bottom.

Each body member 310 may form a flat surface with a flat outer surface. As a result, the central hub 300 has a polygonal cross section as a whole, and the slot 350 may be formed at a point close to the vertex of the polygonal shape.

The inner surface of the body member 310 may be implemented in a shape corresponding to the designed shape of the accommodating space 305 for accommodating the piston 500 . In the example shown in the drawings, the accommodation space 305 is formed in a cylindrical space, and accordingly, the inner surface of the body member 310 is formed in an arc shape.

As in the example shown in the figure, when the piston 500 includes a plurality of elongated pillar members 520 , the central hub 300 movably supports each of the pillar members 520 in the accommodation space 305 . It may include a constraining member 307 to. Holes are formed in the constraining member 307 through which each of the elongated pillar members 520 can pass, and they may be formed at positions facing each slot 350 .

According to an embodiment of the present invention, each slot 350 may be composed of parts having different widths. For example, the slot 350 may include narrow portions 365 and 375 having a relatively narrow first width and wide portions 360 and 370 having a relatively wide second width. When the blade arm 400 is coupled to the slot 350 , the end protrusion 420 of the blade arm 400 may be inserted into the wide portions 360 and 370 . That is, the second width of the wide portions 360 and 370 is greater than the first width of the narrow portions 365 and 375 , and the width of the end protrusion 420 is greater than the first width and not smaller than the second width.

In the case of the slots 360 and 365 formed between the body members 310, the narrow portion 365 may be formed at the lower portion. That is, when the blade arm 400 is coupled to the coupling flange 320, the slot 360 may have a second width above the height corresponding to the end protrusion 420, and the slot 365 below it. It may have this first width. In the case of the slots 370 and 375 formed between the coupling flanges 320, the narrow portion 375 may be formed on the outside and the wide portion 370 may be formed on the inside. Here, the width (first width) of the narrow portion 375 of the slot formed between the coupling flanges 320 may correspond to the distance between the coupling flanges 320, and the wide portion 370 is the coupling flange 320. It may be fabricated in a more chiseled shape to form a slot with a larger width (second width).

The slot 350 in the body member 310 may be opened not only to the outside but also to the top, and when the blade arm 400 is coupled to the central hub 300 , the end protrusion 420 of the blade arm 400 . Inserts the blade arm 400 into the open upper side of the slot 350 so that it passes through the wide portions 360 and 370 of the slot 350 and a portion of the coupling end 410 passes through the narrow portions 365 and 375 can do. The blade arm 400 is rotated about the rotation axis (ie, the position of the coupling hole 480) with respect to the coupling flange 320 so that the blade (not shown) is folded and unfolded, and the blade arm 400 is about Assuming that the rotation is within the range of 90 degrees, the end protrusion 420 formed with a width greater than the first width can be moved only within the wide portions 360 and 370 formed inside. Of course, the positions of the wide portions 360 and 370 can be designed in various ways in consideration of the position of the end protrusion 420 on the blade arm 400 and the range in which the blade arm 400 rotates with respect to the coupling flange 320 . can

In each body member 310, the upper deck 330 and the lower deck 340 may extend between the coupling flanges 320 on both sides. Support stubs 332 and 342 extending from the end of the coupling flange 320 may be formed at one end of the decks 330 and 340 . For example, the upper deck 330 and the lower deck 340 are predetermined from the coupling flange 320 of one end of the body member 310 in the opposite direction to the rotation direction of the foldable stirrer (to the right in FIGS. 1 and 4). After the distance is extended, the support stubs 332 and 342 may be formed at one end adjacent to the coupling flange 320 of the other end of the body member 310 and adjacent to the coupling flange of one end of the body member 310 . When the foldable agitator operates, each blade arm 400 is stronger than the coupling flange 320 at the downstream of the pair of coupling flanges 320 to which the blade arm 400 is coupled, rather than the coupling flange 320 upstream of the blade arm 400 A force may act, and the above structure of the upper and lower decks 330 and 340 can more effectively reinforce the adjacent downstream coupling flange 320 in the portion of the support stub 332 and 342 protruding to a greater length. .

On the other hand, the upper deck 330 connecting the upper portions of the coupling flanges 320 at both ends to each other may have a platform 334 formed on one side thereof. The platform 334 may correspond to a predetermined height protruding above the upper deck 330 . The platform 334 may be formed on one side where the support stub 332 is formed, and may not be formed on the other side. In particular, the inclined support surface 336 inclined at a predetermined angle is formed on one side of the platform 334 to be inclined downward toward the coupling flange 320 .

The upper deck 330 and the lower deck 340 protrude from the outer surface of the body member 310 implemented in a flat shape to reinforce the coupling flanges 320 at both ends. The central hub 300 may be formed in a smaller volume while maintaining the same strength as compared to a conventional stirrer having a round cross-section. This reduces the amount of material used for manufacturing the central hub 300 and enables reduction of manufacturing cost, as well as reducing the total weight of the foldable stirrer. When the weight of the foldable stirrer is reduced, the operating efficiency of the stirrer may be increased, and workability may be improved during installation and removal of the stirrer.

In addition, the upper deck 330 may support the blade arm 400 when the blade arm 400 and a blade (not shown) mounted thereon are in a folded state. That is, when the blade arm 400 is folded, the inclined support surface 460 on the reinforcement part 450 of the blade arm 400 may be seated on the inclined support surface 336 of the upper deck 330 . The platform 334 formed with an increased thickness can bear the load of the blade arm 400 by contact between the upper deck 330 and the inclined support surfaces 336 and 460 of the reinforcement part 450, so that the load is applied to the coupling flange. It can be prevented from being concentrated on (320). Since the platform 334 is formed only on one side of the upper deck 330 and is not formed on the other side, the blade mounting part 430 bent at a predetermined angle with respect to the coupling end 410 when the blade arm 400 is folded upward is the platform ( 334) can be prevented.

The piston 500 is accommodated in the receiving space 305 of the central hub 300 as described above and may be configured to move between an ascending position and a descending position by a rod or the like inside the rotary shaft. When the central hub 300 rotates, the piston 500 accommodated therein also rotates. Since the rod (not shown) is coupled to the piston 500, the rod (not shown) may rotate together due to the rotation of the piston 500. When the rotation of the rod (not shown) is undesirable, for example, the rod ( (not shown) is coupled to another driving gear, the piston 500 may be rotatably coupled to the rod (not shown) to prevent the rotational force of the piston 500 from being transmitted to the rod (not shown).

6 shows a state in which the piston 500 is descended as much as possible, and FIG. 7 shows a state in which the piston 500 is relatively elevated. When viewed with respect to the central hub 300, only the rotation shaft of the blade arm 400 (ie, the position of the coupling hole 480) maintains a fixed state. 6 and 7, the piston 500 may include a column member 520 and a pressing protrusion 540, and as in the example shown in the figure, the piston 500 is a plurality of elongated column members ( When the 520 is included, an upper plate 510 connecting each of the pillar members 520 may be included. The pillar member 520 may have a shape cut along the axial direction from a cylinder, and the pressing protrusion 540 may be formed on the corresponding flat surface 525 .

The pressure protrusion 540 of the piston 500 may be formed at a position corresponding to the end protrusion 420 of the blade arm 400 . The pressing protrusion 540 is configured to rotate the blade arm 400 by pressing the end protrusion 420 , and the pressing protrusion 540 may be located in the slot 350 .

In the foldable stirrer according to an embodiment of the present invention, when the piston 500 descends from the ascending position to the descending position, the pressure protrusion 540 provided in the piston 500 and located in the slot 350 descends while the blade arm ( The end protrusion 420 of 400 can be pressed. When sufficient force is applied to the end protrusion 420, the blade arm 400 may be rotated to the position shown in FIG. 6, and as a result, the blade arm 400 and the blade (not shown) mounted thereon may be folded. . Conversely, when the piston 500 rises from the lowered position to the raised position, the pressure protrusion 540 rises as shown in FIG. 7 and the blade arm 400 can be rotated by the weight of the blade, as a result of which the blade (not shown) poems) can be unfolded. Of course, the above case is only one example, and the position of the pressing protrusion 540 on the column member 520 , the number of pressing protrusions 540 and the direction in which the pressing protrusion 540 presses the end protrusion 420 . may vary. For example, an embodiment in which the pressing protrusion 540 is positioned below the column member 520 to press the end protrusion 420 upward is also possible.

As the pressure protrusion 540 comes into contact with the end protrusion 420 in this way and the piston 500 moves within the accommodation space 305, the angle of the blade arm 400 with respect to the central hub 300 can be changed. , when the blade arm 400 is rotated, the end protrusion 420 may move within the wide portions 360 and 370 .

The narrow portions 365 and 375 of the slot 350 are located on the outside and the lower side of the slot 350, and the wide portions 360 and 370 are located only on the inside of the slot 350, so that the blade arm 400 is connected to the coupling flange ( Even if the coupling member (not shown) coupled to the 320 is damaged or separated, the end protrusion 420 is caught by the narrow portions 365 and 375 of the slot and the blade arm 400 cannot be separated. When the blade arm 400 is detached, it may be very inconvenient to collect the blade from the stirring tank. In particular, if the blade arm 400 is detached when the folding stirrer is in operation, there is a risk of product damage and safety accidents, but the end protrusion ( 420) and the above structure of the slot 350 can solve this problem.

The pressing protrusion 540 may include a locking surface 542 inclined downwardly toward the outside on its lower surface. 6 and 7, there is a locking surface 542 inclined outward from the middle part on the lower surface of the pressing protrusion 540, and there is an inclined surface 544 inclined inward from the middle part so that the middle part is concave upward. It forms an indented groove.

As shown in FIG. 6 , the coupling end 410 and the end protrusion 420 of the blade arm 400 may be configured to be in contact with the pressing protrusion 540 . That is, in a state in which the blade arm 400 is fully folded as in FIG. 6 , the surface of the inner edge of the coupling end 410 may make surface contact with the surface of the outer edge of the pressing protrusion 540, and the end protrusion ( The surface of the upper edge of the 420 may be in surface contact with the engaging surface 542 of the pressing protrusion 540 . When the piston 500 rises as in FIG. 7 , the point at which the end protrusion 420 contacts the pressing protrusion 540 moves along the engaging surface 542 , and the blade arm 400 engages the coupling flange 320 . can be rotated around the bonding position of When the blade arm 400 rotates, since a spare groove 470 is formed in the coupling end 410 , the pressing protrusion 540 can move without being interfered by the coupling end 410 .

If the pressing projection 540 does not have a locking surface 542 and the lower surface is horizontal, the pressing projection 540 will not specifically restrain the end projection 420, so the blade arm 400 and the blade (not shown) are small. It will be shaken by an external force. However, as in the folding stirrer according to an embodiment of the present invention, when the engaging surface 542 inclined downwardly toward the outside is formed on the lower surface of the pressing protrusion 540, the engaging surface 542 is the end protrusion 420 on the lower side. Not only that, but it can also be constrained to the inside. Since the locking surface 542 can act as a kind of locking member and constrain the end protrusion 420, the blade does not easily move by an external force, and thus, it is possible to prevent a decrease in the operating efficiency of the agitator.

6 and 7, since the pressing protrusion 540 is configured to press the end protrusion 420 downward, the engaging surface 542 is formed on the lower surface of the pressing protrusion 540, but the pressing protrusion 540 is In the embodiment configured to press the end protrusion 420 upward, the engaging surface 542 may be formed on the upper surface of the pressing protrusion 540 .

Although the above has been described with reference to one embodiment of the present invention, those of ordinary skill in the art can variously change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that modifications and variations are possible.

300: central hub
400: blade arm
500: piston

Claims (7)

A central hub including a slot that is opened to the outside on the side and including a pair of coupling flanges formed on both sides of the slot;
a blade arm having a coupling end formed on one side inserted into the slot to be coupled to the pair of coupling flanges; and
A piston is accommodated in a receiving space inside the central hub to be movable between an ascending position and a descending position and including a pressure protrusion located in the slot,
The blade arm is rotatably coupled to the coupling flange,
The pressure protrusion is in contact with the end protrusion and the angle of the blade arm with respect to the central hub is changed as the piston moves in the receiving space,
The blade arm includes an end protrusion formed on one side of the coupling end and having a width greater than the width of the coupling end,
The slot includes a narrow portion having a first width and a wide portion having a second width greater than the first width,
The end projection has a width greater than the first width and not greater than the second width,
The blade arm is inserted into the open upper side of the slot so that the end protrusion passes through the wide portion and the coupling end passes through the narrow portion and is coupled to the central hub,
The wide portion is formed at a position higher than a height corresponding to the end protrusion when the blade arm is coupled to the coupling flange,
Foldable stirrer, characterized in that when the blade arm is rotated, the end protrusion moves within the wide part.
delete The method of claim 1,
The pressing protrusion includes a locking surface inclined downwardly to the outside on its lower surface or a locking surface inclined upwardly toward the outside on its upper surface,
A portion of the coupling end adjacent to the end protrusion is formed with a streamlined allowance groove,
Folding stirrer, characterized in that when the piston is in the raised position or the lowered position, the engaging surface constrains the end protrusion inwardly by surface contact between the engaging surface and the end protrusion.
The method of claim 1,
The central hub is
a plurality of body members spaced apart from each other to form the slots and having the coupling flanges formed at both ends; and
Including a deck extending between the coupling flanges at both ends of the body member,
A folding stirrer, characterized in that the outer surface of the body member forms a flat plane.
5. The method of claim 4,
The deck extends a predetermined distance from the coupling flange of one end of the body member in the opposite direction to the rotational direction of the foldable stirrer, and then extends toward the coupling flange of the other end of the body member and has a support stub at one end adjacent to the coupling flange of one end of the body member. Folding agitator, characterized in that to form.
6. The method of claim 5,
The deck connects the upper parts of the coupling flanges at both ends to each other,
A platform protruding a predetermined height upward is formed on one side of the deck, and the platform is a folding stirrer, characterized in that it includes an inclined support surface inclined at a predetermined angle on one side toward the coupling flange of the adjacent one end.
The method of claim 1,
The blade arm is
a blade mounting portion extending by being bent at an obtuse angle with respect to the coupling end; and
Folding stirrer, characterized in that it further comprises a reinforcing part extending in a direction different from the direction in which the blade mounting part is bent at the intersection of the coupling end and the blade mounting part.

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