Automatic closing door for work platform

Abstract

An automatic closing door for a work platform is disclosed. The automatic closing door for a work platform according to one embodiment of the present invention is a door for opening and closing a lifting passage of work platforms, each having the lifting passage formed therein and being installed in multiple stages, the automatic closing door comprising: a door body disposed in the lifting passage and opened and closed by a rotary shaft having both ends each fixed to the work platform; a case including a first surface through which the rotary shaft passes, a second surface opposite to the first surface, and a first side surface and a second side surface connecting the first surface and the second surface to each other; a pinion gear disposed inside the case and mounted on the rotary shaft to rotate together with the rotary shaft; a rack gear disposed inside the case, engaged with the pinion gear to advance and retract along the longitudinal direction of the door body according to rotation of the pinion gear, and having a hollow part formed therein; an elastic member having one end coupled to the inner surface of the rack gear and the other end coupled to the first side surface of the case to be compressed or restored according to movement of the rack gear; and a brake unit including a fixed brake having one surface fixed to the first surface and including a first region having a first thickness and a second region having a second thickness thicker than the first thickness, and a friction brake having one surface fixed to the pinion gear and the other surface in contact with the other surface of the fixed brake.

Description

Automatic closing door for work platforms

[0001] The present invention relates to an automatic closing door for a work platform, and more specifically, to an automatic closing door for a work platform that opens and closes a lifting passage formed on a work platform such as scaffolding, wherein when a user opens the door to move through the lifting passage, the door automatically closes again so that it can function as a work platform, while closing while decelerating, thereby preventing safety accidents.

[0002] Generally, temporary structures installed to allow work or construction at high places, such as scaffolds or gang forms, consist of work platforms and safety railings provided for users to move around.

[0003] The work platform is formed in multiple levels, with an elevator passageway formed on each floor. A means of movement, such as a ladder, is installed to allow workers to move up and down through the passageway, and a safety door is installed in the passageway to prevent workers from falling towards the ladder.

[0004] The safety door is normally used as a work platform, and when a user wants to move to another floor, they climb up partially using a ladder, open the safety door, climb up, and move completely.

[0005] However, workers who open the safety door and complete entry are supposed to close the safety door again, but often fail to do so. As a result, other users are unaware that the door is open and fall through the elevator shaft while moving during the work process, leading to safety accidents.

[0006] In addition, when multiple workers use a ladder to climb a work platform, safety accidents frequently occur where the first worker to climb opens the safety door and then lets go of it, causing the door to close due to the weight, resulting in the subsequent worker's hands, feet, or head hitting the door before they can complete their entry.

[0007] Accordingly, technologies that allow safety doors to close automatically have been disclosed.

[0008] Conventional technologies are configured to automatically close the safety door using an elastic member, such as a spring, on the axis of the safety door, and to slow down the closing speed despite the weight of the safety door when it closes using a hydraulic cylinder / shock absorber.

[0009] However, when actually applied to scaffolding or gang forms, impacts caused by workers throwing objects are very frequent, often resulting in damage to hydraulic cylinders or shock absorbers, which fail to function properly.

[0010] In addition, technologies have been disclosed that allow the safety door to remain open at a predetermined angle after it has been opened. While this can prevent safety accidents caused by the door closing when multiple users climb a work platform using a ladder, fall accidents still occur because the safety door is not closed again as it remains open.

[0011] Therefore, there is a need to develop an automatic closing door for work platforms that can be safely used by automatically closing the safety door while reducing the closing speed without using hydraulic cylinders or soak absorbers.

[0012] The purpose of the present invention is to provide an automatic closing door for a work platform according to one embodiment of the invention, which is a door for opening and closing a lifting passage formed on a work platform such as scaffolding, and which automatically closes again to function as a work platform when a user opens the door to move through the lifting passage.

[0013] In addition, the automatic closing door for a work platform according to one embodiment of the present invention is a door that opens and closes a lifting passage formed on a work platform such as scaffolding, and aims to provide an automatic closing door for a work platform that can be safely used by reducing the closing speed when it closes automatically without using a hydraulic cylinder or shock absorber.

[0014] In addition, the automatic closing door for a work platform according to one embodiment of the present invention is a door that opens and closes a lifting passage formed on a work platform such as scaffolding, and aims to provide an automatic closing door for a work platform that can be automatically closed even when the door is opened more than 90 degrees.

[0015] The problems of the present invention are not limited to the technical problems mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.

[0016] An automatic closing door for a work platform according to an embodiment of the present invention is a door for opening and closing a lifting passage formed in a plurality of work platforms installed in multiple stages, and comprises: a door body disposed in the lifting passage and opened and closed by a rotating shaft, each having both ends fixed to the work platform; a case including a first surface through which the rotating shaft penetrates, a second surface opposite to the first surface, and a first side and a second side connecting the first surface and the second surface to each other; a pinion gear disposed inside the case and mounted on the rotating shaft to rotate together with the rotating shaft; a rack gear disposed inside the case, meshing with the pinion gear to move back and forth along the longitudinal direction of the door body according to the rotation of the pinion gear, and having a hollow portion formed inside; and an elastic member, one end of which is coupled to the inner surface of the rack gear and the other end of which is coupled to the first side of the case, and which is compressed or restored according to the movement of the rack gear. A brake unit comprising: a fixed brake having one surface fixed to the first surface and including a first region having a first thickness and a second region having a second thickness thicker than the first thickness; and a friction brake having one surface fixed to the pinion gear and the other surface in contact with the other surface of the fixed brake.

[0017] In an embodiment, the friction brake includes a third region having a third thickness and a fourth region having a fourth thickness thicker than the third thickness, and when the door body is closed, the second region and the fourth region may come into contact with each other.

[0018] In an embodiment, a ball disc having one side coupled to a second side of the case and a ball fixed to the other side; a ball brake fixed to the pinion gear and having an arc-shaped groove formed in an area corresponding to the ball; wherein the depth of the groove may increase from one end to the other.

[0019] In an embodiment, when the door body is closed, the ball may be placed at the other end of the groove.

[0020] In an embodiment, an elastic support plate may be further included, one side of which is coupled to the second side of the case, and the other side of which elastically supports the ball disk.

[0021] In an example, one or more catch projections may be formed protruding from the bottom surface of the groove.

[0022] According to embodiments of the present invention, at least the following effects are achieved.

[0023] According to an embodiment of the present invention, the automatic closing door for a work platform is a door that opens and closes a lifting passage formed on a work platform such as scaffolding. When a user opens the door to move through the lifting passage, it automatically closes again to function as a work platform, and falls can be prevented.

[0024] In addition, the door can be automatically closed again even if it is opened more than 90 degrees.

[0025] In addition, the door is decelerated during the closing process, so collisions with other users can be minimized as the door closes automatically.

[0026] In addition, the fixed brake and the friction brake have different contact areas when the door is open and closed, and when the door is closed, the thicker areas come into contact with each other, allowing for deceleration by friction.

[0027] In addition, a second brake unit may be installed separately to provide a higher deceleration effect.

[0028] In addition, the second brake part allows the ball to move along the groove during the process of closing the door, and as the depth of the groove gradually increases, the frictional force increases, so that the deceleration effect can be higher.

[0029] In addition, as the ball moves along the groove, it temporarily stops due to the stopper, causing the door to decelerate and close in stages, making it safer.

[0030] The effects according to the present invention are not limited to those exemplified above, and various other effects are included in this specification.

[0031] FIG. 1 is an installation state diagram of an automatic closing door for a work platform according to an embodiment of the present invention.

[0032] FIG. 2 is a schematic perspective view of an automatic closing door for a work platform according to an embodiment of the present invention.

[0033] FIG. 3 is a schematic side view of the open state of an automatic closing door for a work platform according to an embodiment of the present invention.

[0034] FIG. 4 is a schematic side view of the closed state of an automatic closing door for a work platform according to an embodiment of the present invention.

[0035] FIG. 5 is a schematic front view of the closed state of an automatic closing door for a work platform according to an embodiment of the present invention.

[0036] FIG. 6 is a schematic front view of an open state of an automatic closing door for a work platform according to an embodiment of the present invention.

[0037] FIG. 7 is a schematic diagram of a second brake part in the open state of an automatic closing door for a work platform according to an embodiment of the present invention.

[0038] FIG. 8 is a schematic explanatory diagram showing the second brake part in an open state of an automatic closing door for a work platform according to an embodiment of the present invention from another direction.

[0039] FIG. 9 is a schematic diagram of a second brake part in a closed state of an automatic closing door for a work platform according to an embodiment of the present invention.

[0040] FIG. 10 is a schematic explanatory diagram showing the second brake part in a closed state of an automatic closing door for a work platform according to an embodiment of the present invention from another direction.

[0041] FIG. 11 is a schematic exploded perspective view of the main components of an automatic closing door for a work platform according to one embodiment of the present invention.

[0042] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0043] Prior to the explanation, the terms used in the detailed description are explained. In the following embodiments, terms such as "first," "second," etc., are used not in a limiting sense, but for the purpose of distinguishing one component from another. Therefore, it is understood that the first component mentioned below may be the second component within the technical scope of the present invention. Furthermore, singular expressions include plural expressions unless the context clearly indicates otherwise. Additionally, terms such as "include" or "have" mean that the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification exist, and do not preclude the possibility that one or more other features or components may be added.

[0044] Additionally, the size of components in the drawings may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is illustrated.

[0045] Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof are omitted.

[0046] An automatic closing door for a work platform according to one embodiment of the present invention is a door that opens and closes a lifting passage formed on a work platform such as scaffolding, and when a user opens the door to move through the lifting passage, it automatically closes again so that it can function as a work platform, while closing while decelerating, thereby preventing safety accidents.

[0047] FIG. 1 is an installation state diagram of an automatic closing door for a work platform according to an embodiment of the present invention; FIG. 2 is a schematic perspective view of an automatic closing door for a work platform according to an embodiment of the present invention; FIG. 3 is a side view of an automatic closing door for a work platform in an open state according to an embodiment of the present invention; FIG. 4 is a side view of an automatic closing door for a work platform in a closed state according to an embodiment of the present invention; FIG. 5 is a front view of an automatic closing door for a work platform in a closed state according to an embodiment of the present invention; FIG. 6 is a front view of an automatic closing door for a work platform in an open state according to an embodiment of the present invention; FIG. 7 is a schematic explanatory diagram of a second brake part in an open state according to an embodiment of the present invention; FIG. 8 is a schematic explanatory diagram of a second brake part in an open state according to an embodiment of the present invention shown from another direction; FIG. 9 is an automatic for a work platform according to an embodiment of the present invention FIG. 10 is a schematic explanatory diagram of the second brake part in the closed state of the closed door, FIG. 10 is a schematic explanatory diagram of the second brake part in the closed state of the automatic closing door for a work platform according to one embodiment of the present invention shown from another direction, and FIG. 11 is a schematic exploded perspective view of the main part configuration of the automatic closing door for a work platform according to one embodiment of the present invention.

[0048] An automatic closing door (1000) for a work platform according to one embodiment of the present invention includes a door body (100), a case (200), a pinion gear (300), a rack gear (400), an elastic member (500), and a brake part (600).

[0049] The door body (100) is configured to be installed in a lifting passage formed on a work platform of a temporary structure such as scaffolding or gang form. The work platform is formed in multiple stages to allow workers to work in shipbuilding or high-rise building construction, and an lifting passage, which is an opening, is formed in one area. A means of movement, such as a ladder, is installed in the lifting passage so that a worker can move up and down on each floor.

[0050] And a door body (100) is installed and finished in the elevator passageway, and users can move when the door body (100) is open, and when the door body (100) is closed, the door body (100) also functions as a work platform. That is, it is configured so that a user can step on it and stand to work.

[0051] At this time, the work platform can be constructed by welding a thick wire mesh to the inner or upper surface of a square frame, and the door body (100) can be constructed by welding a wire mesh to a frame corresponding to the shape of the elevator passage (opening). The shape of the door body (100) itself can be configured in various ways, such as an elliptical shape.

[0052] The door body (100) is rotatably provided by a rotation axis (110), and both ends of the rotation axis (110) are fixed to the work platform (frame). Since the work platform and the door body (100) itself are known, a detailed description is omitted.

[0053] The case (200) is configured to house components such as a pinion gear (300), a rack gear (400), an elastic member (500), and a brake part (600), which will be described later. The case (200) is configured to house the aforementioned components so that the automatic closing door (1000) for a work platform according to the present embodiment can be modularized. That is, the present embodiment is configured so that automatic closing and deceleration can be achieved by combining the case (200) with the door body (100).

[0054] In this embodiment, the case (200) may be provided in a cuboidal shape, and since the case (200) must be penetrated by a rotation axis (110), it includes a first surface (210) in which a through hole is formed, a second surface (220) opposite to the first surface (210), a first side surface (230) and a second side surface (240) connecting the first surface (210) and the second surface (220), and an upper surface (250) and a lower surface (260). The rotation axis (110) may penetrate only the first surface (210) or penetrate both the first surface (210) and the second surface (220).

[0055] A bearing (280) is installed in the case (200) so that the rotation axis (110) can be supported.

[0056] The pinion gear (300), rack gear (400), and elastic member (500) are configured to allow the door body (100) opened by an external force to be automatically closed. That is, the configuration allows the rotation axis (110), which is rotated in one direction by an external force, to be automatically rotated in the other direction.

[0057] The pinion gear (300) is mounted on the rotation axis (110) and is arranged to rotate together with the rotation axis (110).

[0058] The rack gear (400) meshes with the pinion gear (300) and is configured to move according to the rotation of the pinion gear (300). In the embodiment, the rack gear (400) has gear teeth formed on one surface (the upper surface in the drawing) to mesh with the gear teeth of the pinion gear (300) and is arranged along the longitudinal direction. That is, in this embodiment, the rack gear (400) is arranged parallel to the first surface (210) and is configured to move back and forth along the longitudinal direction of the door body (100), that is, along the longitudinal direction of the first surface (210).

[0059] A hollow portion (410) is formed inside the rack gear (400), and one side of the rack gear (400) can be opened.

[0060] Accordingly, an elastic member (500) may be disposed inside the rack gear (400), and one end of the elastic member (500) is coupled to the inner surface of the rack gear (400), and the other end is coupled to the first side (230) of the case (200).

[0061] Accordingly, as the door body (100) rotates in the opening direction, the pinion gear (300) rotates and the rack gear (400) advances, thereby compressing the elastic member (500). Then, when the external force on the door body (100) is released, the compressed elastic member (500) is restored, and as a result, the rack gear (400) retracts, causing the pinion gear (300) to rotate in the reverse direction, and thus the door body (100) is automatically closed.

[0062] That is, in this embodiment, by using a rack gear (400), a pinion gear (300), and an elastic member (500), even when the door body (100) is open more than 90 degrees, the door body (100) can be automatically closed by the elastic member (500) restoring the rack gear (400) and moving to forcibly rotate the pinion gear (300).

[0063] Meanwhile, in this embodiment, a stopper groove (420) may be formed in a lower surface area of ​​the rack gear (400). Also, a stopper (270) may be fixed to the lower surface (260) of the case (200). As described above, in this embodiment, the door body (100) can be automatically closed even when it is open more than 90 degrees due to the rack gear (400), the pinion gear (300), and the elastic member (500). Nevertheless, due to the characteristics of the installation site of the automatic closing door (1000) for a work platform according to this embodiment, there is a possibility that the elastic member (500) may be affected by strong door opening, impact from other objects, etc. Accordingly, in this embodiment, a stopper (270) is fixedly installed on the lower surface (260) of the case (200), and the stopper (270) is positioned in the stopper groove (420) of the rack gear (400), thereby preventing the door body (100) from opening too excessively. Additionally, the movement of the rack gear (400) can be guided by the stopper (270) being positioned in the stopper groove (420) of the rack gear (400).

[0064] Furthermore, a guide groove (not shown) may be formed in the lower surface area of ​​the rack gear (400), and a guide projection (not shown) may be formed on the lower surface (260) of the case (200), thereby allowing the rack gear (400) to move back and forth more stably.

[0065] The brake unit (600) is configured to decelerate when the door body (100) is automatically closed.

[0066] When the door body (100) is automatically closed by the rack gear (400), pinion gear (300), and elastic member (500), it may close at a rapid speed due to the weight of the door body (100) during the closing process. This can cause safety accidents when multiple workers open the door body (100) and go up, and the first worker goes up after opening the door body (100), causing the door body (100) to close while the next worker is going up.

[0067] Accordingly, the brake unit (600) is configured to prevent the next worker from colliding with the door body (100) by decelerating when the door body (100) is automatically closed, and to minimize the force applied to the work platform when the door body (100) is closed.

[0068] The brake unit (600) includes a fixed brake (610) and a friction brake (620).

[0069] In this embodiment, the fixed brake (610) and the friction brake (620) may be provided in the shape of a disc and are provided to come into contact with each other.

[0070] The fixed brake (610) is configured to be fixed to the first surface (210). The fixed brake (610) includes a first region (611) having a first thickness and a second region (612) having a second thickness thicker than the first thickness. Since one side of the fixed brake (610) is fixed to the first surface (210), the rotation axis (110) passes through it but does not rotate together with the rotation axis (110).

[0071] For example, the fixed brake (610) may be provided in the shape of a disc, and the side may form a slope from one end to the other. Accordingly, the height of the cross-sectional surface of the fixed brake (610) may differ between one side and the other.

[0072] The friction brake (620) is configured to reduce the closing speed of the door body (100) by frictional force through contact with the fixed brake (610).

[0073] One side of the friction brake (620) is fixed to the pinion gear (300) and rotates together with the pinion gear (300), while the other side comes into contact with the other side of the fixed brake (610). The surfaces of the friction brake (620) and the fixed brake (610) that come into contact with each other may have a rough texture and may have elasticity so that the surface can be pressed when pressure is applied.

[0074] When the pinion gear (300) rotates, the friction brake (620) rotates together, so that the friction force is different due to the first surface (210) and the second surface (220) of the fixed brake (610), thereby allowing for deceleration.

[0075] The friction brake (620) may also include a third region (621) having a third thickness, similar to the fixed brake (610), and a fourth region (622) having a fourth thickness thicker than the third thickness. The first region (611) and the third region (621) may have the same thickness and area, and the second region (612) and the fourth region (622) may also have the same thickness and area.

[0076] At this time, when the door body (100) is closed, it is desirable that the second region (612) of the fixed brake (610) and the fourth region (622) of the friction brake (620) come into contact with each other, thereby increasing the frictional force.

[0077] Specifically, the fixed brake (610) does not rotate with the door body (100), and the friction brake (620) is fixed to the pinion gear (300) and rotates with the door body (100). When the door body (100) is in an open state, the first region (611) and the fourth region (622) are in contact with each other (see FIG. 3). When the door body (100) is closed, the friction brake (620) rotates so that the second region (612) can rotate with the fourth region (622). Accordingly, during the closing process, the regions with greater thickness come into contact with each other (i.e., the thickest regions come into contact with each other when closing is complete, and the contact area of ​​the thick regions increases during closing) (see FIG. 4), thereby increasing the frictional force and allowing for deceleration.

[0078] Meanwhile, in an embodiment, the automatic closing door (1000) for a work platform may further include a second brake unit (700). The second brake unit (700) is configured to be positioned on the opposite side of the brake unit (600) with respect to the pinion gear (300) so as to decelerate when the door body (100) is closed. The second brake unit (700) may include a ball disc (710) and a ball brake (720).

[0079] In an embodiment, the ball disk (710) may be coupled to the second surface (220) of the case (200). At this time, one surface of the ball disk (710) may be coupled to the second surface (220), and the coupling includes not only direct coupling but also indirect coupling through other configurations.

[0080] In this embodiment, the ball disk (710) is coupled to the second surface (220) and does not rotate together with the pinion gear (300).

[0081] A ball (711) is fixed to the other side of the ball disk (710). There may be multiple balls (711), and in this embodiment, two balls (711) are arranged at equal intervals along the circumferential direction. That is, they face each other. Also, the balls (711) do not always need to be spherical, and are not limited to hemispherical shapes, as long as they can be inserted into and moved in the groove (721) described later.

[0082] The ball brake (720) causes the door body (100) to decelerate when it is closed together with the ball disc (710). One side of the ball brake (720) is fixed to the other side of the pinion gear (300) and rotates together with the pinion gear (300). A groove (721) is formed on the other side of the ball brake (720). The groove (721) is an area into which the ball (711) of the ball disc (710) is inserted, and is formed in an area corresponding to the position of the ball (711) which changes according to the rotation of the pinion gear (300). Accordingly, in this embodiment, the groove (721) is formed in an arc shape by the path of the area corresponding to the ball (711).

[0083] That is, the ball disc (710) is fixed and therefore does not rotate, and the ball brake (720) rotates together with the pinion gear (300), so the ball (711) fixedly installed on the ball brake (720) moves while inserted into the groove (721).

[0084] Meanwhile, in this embodiment, the ball disc (710) is described as being fixed to the case (200) and the ball brake (720) is fixed to the pinion gear (300), but this is not necessarily limited thereto, and the ball brake (720) may be fixed to the case (200) and the ball disc (710) may be fixed to the pinion gear (300). In this case, as the ball disc (710) rotates, the ball (711) moves along the groove (721) of the fixed ball brake (720).

[0085] The groove (721) of the ball brake (720) is provided such that its depth increases from one end to the other. When the door body (100) is closed, the ball (711) is placed at the other end of the groove (721) which has the deepest depth, and when the door is open, the ball (711) can be placed at the one end of the groove (721) which has the shallowest depth.

[0086] Accordingly, as the door body (100) closes automatically, the ball (711) moves from one end to the other end, and as the ball (711) moves, the depth of the groove (721) increases, and the contact area between the ball (711) and the groove (721) increases, thereby increasing the frictional force. Therefore, as the door body (100) closes, the frictional force gradually increases, and the speed at which the door body (100) closes can be decelerated.

[0087] Furthermore, one or more stopper ridges (not shown) may be formed protruding from the bottom surface of the groove (721). The stopper ridge restricts the movement of the ball (711) as it moves along the groove (721), so that the ball (711) is temporarily stopped by the stopper ridge during the movement, and then the ball (711) passes over the stopper ridge and closes again. That is, the door body (100) is closed in stages by the stopper ridge.

[0088] It is more preferable that the stopper be formed on the other end side where the depth of the groove (721) increases. This is because the influence of the self-weight of the door body (100) is greater.

[0089] In an embodiment, the second brake part (700) may further include an elastic support plate (730).

[0090] The elastic support plate (730) is configured to elastically support the ball disc (710) toward the ball brake (720).

[0091] The elastic support plate (730) is coupled to the second surface (220) of the case (200), and a spring (731) may be interposed between the ball discs (710). Accordingly, the ball discs (710) are pressed toward the ball brake (720) by the spring (731), and the ball (711) is pressed toward the groove (721), thereby increasing the frictional force.

[0092] At this time, a control member (290) may be installed on the second surface (220) of the case (200). The control member (290) penetrates the second surface (220) and is coupled to the elastic support plate (730). The elastic support plate (730) can be moved toward the first surface (210) by the control member (290), and as a result, the ball disc (710) can be pressed toward the ball brake (720). During use, the spring (731) is affected, and as a result, the ball disc (710) and the ball brake (720) may move slightly further apart from each other. However, by the control member (290) pressing the elastic support plate (730) toward the first surface (210), the ball disc (710) is pressed toward the ball brake (720), thereby maintaining the distance and enabling a deceleration function.

[0093]

[0094] From now on, the operation of an automatic closing door for a work platform according to one embodiment of the present invention will be described.

[0095] For convenience, it is explained that both the brake section (600) and the second brake section (700) are included.

[0096] First, with the door closed, the brake unit (600) is in a state where the friction brake (620) and the fixed brake (610) have their thicker surfaces in contact with each other. That is, the second area (612) and the fourth area (622) are in contact with each other. And the ball (711) of the ball disc (710) of the second brake unit (700) is inserted into the other end side, that is, the deeper part, of the groove (721) of the ball brake (720).

[0097] When a worker wants to move through the elevator shaft, for example, when moving to an upper floor by climbing a ladder, the worker rotates the door body (100) upward.

[0098] As the rotation axis (110) of the door body (100) rotates, the pinion gear (300) coupled to the rotation axis (110) rotates, and the rack gear (400) engaged with the pinion gear (300) advances. In this process, if a stopper groove (420) is formed on the lower surface (260) of the rack gear (400) and a stopper (270) is fixedly installed on the lower surface (260) of the case (200), the opening rotation of the door body (100) can be limited to a predetermined angle by the stopper (270). Also, if a guide groove is formed on the lower surface (260) of the rack gear (400) and a guide projection is formed on the lower surface (260) of the case (200), the rack gear (400) can be guided to advance along the guide projection.

[0099] The elastic member (500) is compressed by the advancement of the rack gear (400).

[0100] And by the rotation of the pinion gear (300), the first region (611), which is a thin region of the friction brake (620), and the fourth region (622), which is a thick region of the fixed brake (610), come into contact with each other.

[0101] And the ball (711) of the ball disc (710) is moved to one side of the groove (721) of the ball brake (720), that is, to a shallow area.

[0102] When the user removes an external force, such as by removing their hand from the door body (100) after moving through the elevator passage (260), the compressed elastic member (500) is restored and the rack gear (400) is retracted. As the rack gear (400) is retracted, the pinion gear (300) rotates in reverse, causing the door body (100) to close automatically.

[0103] At this time, due to the reverse rotation of the pinion gear (300), the second region (612), which is a thick area of ​​the friction brake (620), and the fourth region (622), which is a thick area of ​​the fixed brake (610), come into contact with each other, thereby decelerating. Additionally, the ball (711) of the ball disc (710) moves to the other end side, that is, the deeper side, of the groove (721) of the ball brake (720), and the friction force increases, thereby decelerating. Furthermore, as the ball (711) moves along the groove (721), a temporary stopping phenomenon occurs due to the stopper, and as a result, the door body (100) is decelerated and closed in stages.

[0104] As described above, according to the present invention, an automatic closing door for a work platform is provided, which is a door for opening and closing a lifting passage formed on a work platform such as a scaffold, and when a user opens the door to move through the lifting passage, it automatically closes again so that it can function as a work platform, while closing while decelerating, thereby preventing safety accidents.

[0105] The use of all examples or exemplary terms (e.g., etc.) in the present invention is merely for the purpose of describing the invention in detail, and the scope of the invention is not limited by such examples or exemplary terms unless limited by the claims. Furthermore, a person skilled in the art will understand that various modifications, combinations, and changes may be made according to design conditions and factors within the scope of the claims or equivalents to which they are added.

[0106] Accordingly, the scope of the present invention is not limited to the embodiments described above, and all scopes equivalent to or equivalently modified from the claims set forth below, as well as the claims described below, shall be considered to fall within the scope of the concept of the present invention.

[0107] An automatic closing door for a work platform is provided, which is a door for opening and closing a passage formed on a work platform such as scaffolding, and which prevents safety accidents by automatically closing the door while slowing down when a user opens the door to move through the passage so that it can function as a work platform.

Claims

1. A door for opening and closing the lifting passage of a work platform in which a lifting passage is formed and multiple platforms are installed in multiple stages, A door body positioned in the above elevator passage and opened and closed by a rotating shaft, each having both ends fixed to the above work platform; A case comprising a first surface through which the rotation axis passes, a second surface opposite to the first surface, and a first side surface and a second side surface connecting the first surface and the second surface to each other; A pinion gear disposed inside the above case and mounted on the rotation axis to rotate together with the rotation axis; A rack gear disposed inside the above case, meshing with the pinion gear and moving back and forth along the longitudinal direction of the door body according to the rotation of the pinion gear, and having a hollow portion formed inside; An elastic member having one end coupled to the inner surface of the rack gear and the other end coupled to the first side of the case, which is compressed or restored according to the movement of the rack gear; A brake unit comprising: a fixed brake having one surface fixed to the first surface and including a first region having a first thickness and a second region having a second thickness thicker than the first thickness; and a friction brake having one surface fixed to the pinion gear and the other surface in contact with the other surface of the fixed brake. Automatic closing door for work platforms.

2. In Paragraph 1, The above friction brake is, It includes a third region having a third thickness and a fourth region having a fourth thickness thicker than the third thickness, When the door body is closed, the second region and the fourth region come into contact with each other. Automatic closing door for work platforms.

3. In Paragraph 1, A ball disc having one side coupled to the second side of the above case and a ball fixed to the other side; A ball brake that is fixed to the pinion gear and has an arc-shaped groove formed in an area corresponding to the ball; comprising The above groove becomes deeper from one end to the other. Automatic closing door for work platforms.

4. In Paragraph 3, When the door body is closed, the ball is positioned at the other end of the groove. Automatic closing door for work platforms.

5. In Paragraph 4, A resilient support plate having one side coupled to the second side of the case and the other side elastically supporting the ball disk; further comprising Automatic closing door for work platforms.

6. In Paragraph 4, In the above groove, one or more locking projections are formed protruding from the bottom surface. Automatic closing door for work platforms.

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