JP7811355B2 - Security doors and safety frames with such security doors, as well as grain dryers and grain storage tanks - Google Patents

Description

The present invention relates to a protective door for the roof safety frame of a grain dryer or a grain storage tank that stores grain, a safety frame equipped with the protective door, and a grain dryer and a grain storage tank. More specifically, the present invention relates to a protective door that can be removably installed at the entrance and exit of a safety frame installed above the roof of a grain dryer or grain storage tank to prevent workers from falling, a safety frame equipped with the protective door, and a grain dryer and a grain storage tank.

Grain dryers come in a variety of types, including circulation and flat (general-purpose) grain dryers, for drying grains such as rice and soybeans. A circulation grain dryer has, within the dryer body, from the top, a storage section for storing grain, a drying section for drying the grain, and a circulation mechanism section (e.g., a grain collection section) that discharges the dried grain by rotating a discharge valve (rotary valve), drops it into a grain flow trough below, and circulates it using a lower conveying mechanism. Additionally, a roof section that forms the roof of the dryer body is provided above the storage section of the dryer body.

This type of grain dryer has a grain flow path within the drying section that is separated by a ventilation member and connects the storage section and circulation mechanism section, with a hot air path and an exhaust air path on each side of this grain flow path.The grain is guided from the upper storage section through the drying section to the circulation mechanism section, and then returned to the upper storage section and circulated, while the grain is dried by hot air in the grain flow path in the drying section.

The roof of a grain dryer may be equipped with piping for roof ducts and transport conveyors such as chain conveyors and belt conveyors. During maintenance and inspection work on the dryer, workers may climb onto the roof and perform various tasks above the roof. For this reason, a safety frame (hereinafter simply referred to as a "safety frame") may be installed above the roof of the grain dryer to demarcate a specific area and prevent workers from falling. Climbing up and down to the roof of the grain dryer is accomplished, for example, using a vertical ladder or ladder that connects the ground to the roof.

The safety frame installed above the roof of a grain dryer often has a gap in the surrounding safety frame that allows workers to enter and exit, and this gap is used as an entrance/exit. For this reason, in the past, the entrance/exit of such a safety frame has been equipped with a partition using a chain to prevent workers from falling through the entrance/exit, or with a fixed door that can be opened and closed using hinges, doorknobs, or linked coils (see, for example, Patent Document 1). Furthermore, there are various types of grain storage tanks used as facility equipment for storing grain, such as for unhulled rice, brown rice, and processed rice. A safety frame similar to that of a grain dryer may also be installed above the roof of such grain storage tanks.

JP 2010-31571 A

However, with the chain-based partitions described above, the fences on both ends of the safety frame's entrance/exit gaps are not sufficiently connected, meaning the safety frame's strength cannot be maintained, making it difficult to ensure sufficient safety when workers lean on it, etc.

Mounted doors that use hinges or other devices maintain their strength and do not fall when leaned on, but they have the problem of limited flexibility in installation and limited options for the direction in which the door can be opened and closed. For example, as mentioned above, the roof of a grain dryer is equipped with piping such as a roof-mounted duct, and this piping can sometimes get in the way of opening and closing the door. In particular, when the piping on the roof is complex, it is necessary to prepare multiple installation patterns for the safety frame's entrance and exit, and change the installation location of the entrance and exit depending on the layout of the piping, etc. In such cases, doors that use hinges or other devices can be difficult to install.

The present invention was made in consideration of the problems associated with the prior art. The present invention provides a protective door for the roof safety frame of a grain dryer or grain storage tank, which functions as a fence to prevent falls in the safety frame installed above the roof of the grain dryer or grain storage tank, as a door for accessing the interior of the fence, and as a mechanism for connecting the safety frames together to maintain their strength. The present invention also provides a safety frame equipped with such a protective door, as well as a grain dryer and a grain storage tank.

The present invention provides a protective door for a roof safety frame of a grain dryer or grain storage tank, a safety frame equipped with the protective door, and a grain dryer and grain storage tank, as shown below.

[1] A protective door installed at the entrance and exit of a safety frame installed above the roof of a grain dryer or a grain storage tank that stores grain,
At least three horizontal stay members extending in the width direction of the entrance of the safety frame, and at least two vertical stay members extending in the vertical direction of the entrance and supporting the at least three horizontal stay members at intervals in the vertical direction,
At least two or more of the horizontal stay members have a first connecting recess at one end thereof that connects to an opening frame body that is provided as one vertical frame of the entrance/exit of the safety frame, and a second connecting recess at the other end thereof that connects to an opening frame body that is provided as the other vertical frame of the entrance/exit of the safety frame,
One of the first and second connecting recesses of the horizontal stay member is detachably attached to the opening frame body as the vertical frame of one of the entrances and exits of the safety frame, and forms an opening/closing axis that supports the protective door in a rotatable state with the opening frame body as a fulcrum, and
The other of the first and second connecting recesses of the horizontal stay member is detachably connected to the opening frame body as the other vertical frame of the entrance of the safety frame when the protective door is fully closed, thereby forming an opening and closing end of the protective door,
A protective door for the roof safety frame of a grain dryer or grain storage tank, which is an opening and closing door for the entrance and exit of the safety frame, and is configured to become part of the safety frame when fully closed, connecting the safety frame and maintaining its strength.

[2] The protective door described in [1] above, in which the horizontal stay member located at the top in the vertical direction has mating recesses at both ends that are recessed downward in the vertical direction, and when the protective door is fully closed, the mating recesses are fitted over the frame body that forms the periphery of the entrance/exit edge of the safety frame from above.

[3] The protective door described in [1] or [2], wherein the horizontal stay member located at the top in the vertical direction is a member with a U-shaped cross section that is recessed downward in the vertical direction.

[4] A protective door according to any one of [1] to [3], further comprising a frame body holding aid arranged at the end of the horizontal stay member on the opening/closing axis side so as to cover the opening side of the connecting recess when the safety frame is connected to the opening frame body of the safety frame, and holding the opening frame body within the connecting recess.

[5] A protective door according to any one of [1] to [4], wherein the vertical stay member is arranged to penetrate a portion of the horizontal stay member.

[6] A protective door according to any one of [1] to [5], wherein the vertical stay member is a cylindrical member having a circular cross section perpendicular to the vertical direction.

[7] A protective door according to any one of [1] to [6], wherein all or part of the widthwise inner space between at least two of the vertical stay members is made of a plate-like or mesh-like member.

[8] A protective door according to any of [1] to [7], wherein the horizontal stay member arranged at the top in the vertical direction has a fixing means at at least one end on the opening/closing axis side or the opening/closing end side of the safety frame, for fixing the protective door and the safety frame together when the protective door is fully closed, and for maintaining the protective door in a fully closed state.

[9] The protective door described in [8], wherein the fixing means includes through holes provided in the end of the horizontal stay member and in the frame body that forms the periphery of the entrance/exit edge of the safety frame, and bolts inserted into the through holes.

[10] A safety frame provided on the roof above a grain dryer or grain storage tank, comprising a frame that partitions a specified space within the roof, and a protective door described in any one of [1] to [9].

[11] A grain dryer with a safety frame, comprising a grain dryer and the safety frame described in [10] above the roof of the grain dryer.

[12] A grain storage tank with a safety frame, comprising a grain storage tank and the safety frame described in [10] above the roof of the grain storage tank.

The protective door for the roof safety frame of a grain dryer or grain storage tank of the present invention has the following advantages: it functions as a fence to prevent falls in the safety frame installed above the roof of a grain dryer or the like, functions as a door for accessing the interior of the fence, and functions to connect the safety frames together to maintain their strength.

In particular, the protective door for the roof safety frame of a grain dryer or grain storage tank of the present invention can be detachably installed at the entrance and exit of the safety frame to prevent workers from falling, allowing for excellent installation flexibility and a wide range of opening and closing directions. This allows for multiple variations in the opening, closing, and installation of the protective door to avoid obstacles on the upper roof of a grain dryer or other equipment. Furthermore, because no tools or other implements are required to open or close the protective door, it effectively improves the safety and convenience of workers within the roof safety frame.

In addition, the safety frame, as well as the grain dryer and grain storage tank with the safety frame, are equipped with the protective doors described above, which effectively improves the safety and convenience of workers within the safety frame.

1 is a schematic perspective view of a grain dryer equipped with an embodiment of a protective door of the present invention, seen from obliquely above, from the front to the right side. FIG. 2 is a schematic perspective view of the grain dryer shown in FIG. 1 from the front to the left side, as viewed obliquely from above. FIG. FIG. 2 is a schematic elevation view of the grain dryer shown in FIG. 1 as seen from the right side. FIG. 2 is an enlarged elevation view of a safety frame provided above the roof of the grain dryer. 1 is an elevation view showing a schematic view of one embodiment of a protective door of the present invention. FIG. 6 is a side view of the protective door shown in FIG. 5 . FIG. 6 is a top view of the protective door shown in FIG. 5 . 6 is an explanatory diagram for explaining a method of installing the protective door shown in FIG. 5 on the safety frame. FIG.

The following describes embodiments for carrying out the present invention, but the present invention is not limited to the following embodiments. In other words, it should be understood that appropriate modifications and improvements to the following embodiments, based on the common knowledge of those skilled in the art, fall within the scope of the present invention, as long as they do not deviate from the spirit of the present invention.

One embodiment of the protective door of the present invention is a protective door 10 installed at the entrance 84 of a safety frame 80 provided above the roof portion 92 of a grain dryer 100, as shown in Figures 1 to 4. Figure 1 is a schematic perspective view of a grain dryer 100 equipped with the protective door 10 of this embodiment, viewed obliquely from above, from the front to the right side. Figure 2 is a schematic perspective view of the grain dryer 100 shown in Figure 1, viewed obliquely from above, from the front to the left side. Figure 3 is a schematic elevation view of the grain dryer 100 shown in Figure 1, viewed from the right side. Figure 4 is an enlarged elevation view of the safety frame 80 provided above the roof portion 92 of the grain dryer 100.

The protective door 10 comprises at least three horizontal stay members 12 extending in the width direction X of the entrance/exit 84 of the safety frame 80, and at least two vertical stay members 14 extending vertically of the entrance/exit 84 and supporting the at least three horizontal stay members 12 at intervals in the vertical direction Y.

The protective door 10 of this embodiment functions as a fence to prevent falls in the safety frame 80 installed above the roof portion 92 of the grain dryer 100, as a door for accessing and exiting the interior of the fence, and as a mechanism for connecting the safety frames 80 together to maintain their strength. The configuration of the protective door 10 of this embodiment will be described in more detail below with reference to Figures 1 to 8. Figure 5 is an elevation view schematically showing one embodiment of the protective door of the present invention. Figure 6 is a side view of the protective door shown in Figure 5. Figure 7 is a top view of the protective door shown in Figure 5. Figure 8 is an explanatory diagram for explaining how to install the protective door shown in Figure 5 on the safety frame.

The protective door 10 comprises at least three horizontal stay members 12 (12a, 12b, 12c) and at least two vertical stay members 14 (14a, 14b). The at least three horizontal stay members 12a, 12b, 12c are spaced apart in the vertical direction Y and are supported by at least two vertical stay members 14a, 14b extending in the vertical direction Y. The protective door 10 configured in this manner fully functions as a fall prevention fence for the safety frame 80 when fully closed.

Furthermore, of the at least three horizontal stay members 12a, 12b, and 12c, at least two or more of the horizontal stay members 12b and 12c have a first connecting recess 16 (16a) at one end. The first connecting recess 16a is configured to connect to an opening frame body 86 (86a) provided as one vertical frame 85a of the entrance/exit 84 of the safety frame 80.

Furthermore, of the at least three horizontal stay members 12a, 12b, and 12c, at least two or more horizontal stay members 12b and 12c have a second connecting recess 16 (16b) at the other end. The second connecting recess 16b is configured to connect to the opening frame body 86 (86b) provided as the other vertical frame 85b of the entrance/exit 84 of the safety frame 80.

In the protective door 10 of this embodiment, one of the first and second connecting recesses 16a, 16b of the above-mentioned horizontal stay members 12b, 12c is detachably attached to the opening frame body 86a, which serves as one of the vertical frames 85a of the entrance/exit 84 of the safety frame 80, and forms the opening/closing shaft 32 that supports the protective door 10 in a rotatable state around the opening frame body 86a. For example, in the grain dryer 100 shown in Figures 1 to 4, the first connecting recesses 16a of the horizontal stay members 12b, 12c are attached to the opening frame body 86a to form the opening/closing shaft 32 of the protective door 10.

Meanwhile, the other of the first and second connecting recesses 16a, 16b of the horizontal stay members 12b, 12c is detachably connected to the opening frame body 86b, which serves as the other vertical frame 85b of the entrance/exit 84 of the safety frame 80, when the protective door 10 is fully closed, thereby forming the opening/closing end 34 of the protective door 10. For example, in the grain dryer 100 shown in Figures 1 to 4, the second connecting recesses 16b of the horizontal stay members 12b, 12c are detachably (e.g., openable/closable) connected to the opening frame body 86b, thereby forming the opening/closing end 34 of the protective door 10. In this way, the protective door 10 of this embodiment can be installed in an openable/closable state relative to the entrance/exit 84 of the safety frame 80, and has sufficient functionality as a door for entering and exiting the interior of the fence, as well as sufficient functionality for connecting safety frames 80 together and maintaining their strength. For example, the protective door 10 of this embodiment can effectively prevent bending, shaking, or coming loose when a worker leans on it, pushes it, steps on it, or performs other anticipated actions.

As described above, the protective door 10 of this embodiment can be detachably attached to the entrance 84 of the safety frame 80 used to prevent workers from falling, providing excellent installation flexibility and a wide range of opening and closing directions. This allows for multiple variations in the opening, closing, and installation of the protective door 10 to avoid obstacles above the roof 92 of the grain dryer 100. Furthermore, since no tools or other implements are required to open or close the protective door 10, it effectively improves the safety and convenience of workers within the safety frame 80 installed on the roof 92. For example, the protective door 10 of this embodiment can open the entrance 84 by disconnecting the connecting recess 16b on the opening end 34, easily ensuring sufficient clearance for workers to pass through. Meanwhile, the connecting recess 16a on the opening and closing shaft 32 of the protective door 10 provides a relatively durable connection with the opening frame 86a of the entrance 84 when the safety frame 80 is in use, preventing it from being easily disconnected by the operator's movements of the safety frame 80. The protective door 10 of this embodiment is not limited to being installed on the roof portion 92 above the grain dryer 100; for example, although not shown, it may be installed on the roof portion above various grain storage tanks, such as for unhulled rice, brown rice, or adjusted grain.

The horizontal stay members 12 that make up the protective door 10 connect to the opening frame bodies 86a, 86b at both ends of the entrance/exit 84 of the safety frame 80 when the protective door 10 is fully closed, connecting the safety frames 80 together. For this reason, if there are fewer than three horizontal stay members 12, sufficient strength may not be obtained when connecting the safety frames 80 together.

Furthermore, at least two or more horizontal stay members 12 (12b, 12c) have connecting recesses 16 at both ends, and these connecting recesses 16 are the actual connecting parts to the entrance/exit 84 of the safety frame 80. Therefore, if there are fewer than two horizontal stay members 12 with connecting recesses 16, the connection to the entrance/exit 84 will be insufficient, and the protective door 10 may fall over, for example, when the protective door 10 is slightly pulled up in the vertical direction Y to open or close it.

The vertical stay members 14 that make up the protective door 10 support the horizontal stay members 12 that are spaced apart in the vertical direction Y, and serve to stabilize the shape of the protective door 10. Therefore, if there are fewer than two vertical stay members 14, the shape of the protective door 10 may not be stable.

The horizontal stay members 12 can be, for example, made of channel material with a U-shaped cross section with the opening facing downward. At least two horizontal stay members 12 preferably have notches formed in portions of both ends to form first and second connecting recesses 16a, 16b. Also, a hole through which the vertical stay member 14 can pass is preferably formed in a portion of the horizontal stay member 12. By positioning the vertical stay member 14 so that it passes through such a hole, at least three horizontal stay members 12a, 12b, and 12c can be fixed at intervals in the vertical direction Y.

The horizontal stay member 12a located at the top in the vertical direction Y may have mating recesses at both ends that are recessed downward in the vertical direction Y, and may be configured so that when the protective door 10 is fully closed, these mating recesses fit over the frame body 82a that forms the periphery of the entrance/exit edge of the safety frame 80 from above. This configuration effectively prevents the protective door 10 from wobbling or being accidentally opened when the protective door 10 is fully closed. For this reason, it is particularly preferable that the horizontal stay member 12a located at the top be configured from a member with a U-shaped cross section that is recessed downward in the vertical direction (for example, the channel material described above).

The protective door 10 of this embodiment preferably further includes a frame holding auxiliary device 20 at the end of the horizontal stay member 12 on the opening/closing axis 32 side for holding the opening frame body 86a of the entrance/exit 84 of the safety frame 80. The frame holding auxiliary device 20 is arranged at the end of the horizontal stay member 12 on the opening/closing axis 32 side so as to cover the opening side of the connecting recess 16a that is connected to the opening frame body 86a of the safety frame 80, and holds the opening frame body 86a within the connecting recess 16a. The frame holding auxiliary device 20 is an auxiliary device for supporting the protective door 10 in a state where it can rotate around the horizontal stay members 12b, 12c and the opening frame body 86a as fulcrums, and can be, for example, a metal fitting having a recess of a shape complementary to the first connecting recess 16a. The recess of the frame holding auxiliary device 20 is arranged to fit into the first connecting recess 16a of the horizontal stay members 12b, 12c, and can be secured by a fastener such as a bolt 28.

8, for example, the recess of the frame holding auxiliary device 20 is positioned to overlap the first connecting recess 16a of the horizontal stay members 12b and 12c, so that the opening frame 86a, which is provided as one vertical frame 85a of the entrance 84 of the safety frame 80, becomes the opening/closing axis 32 of the protective door 10. The frame holding auxiliary device 20 is configured to be detachable using fasteners such as bolts 28, and the location where it is positioned so that it overlaps with the second connecting recess 16b of the horizontal stay members 12b and 12c can be changed. This configuration allows the opening/closing axis 32 of the protective door 10 to be switched to the opening frame 86b side, which is provided as the other vertical frame 85b of the entrance 84, making it easy to change the right-opening or left-opening specifications of the protective door 10 depending on where the frame holding auxiliary device 20 is installed.

When the connecting recesses 16 of the horizontal stay members 12b, 12c are connected to the opening frame body 86a of the entrance/exit 84 from the inside of the safety frame 80, the protective door 10 becomes an inward-opening door. Conversely, when the connecting recesses 16 of the horizontal stay members 12b, 12c are connected to the opening frame body 86a of the entrance/exit 84 from the outside of the safety frame 80, the protective door becomes an outward-opening door. In this way, by changing the connection direction with the opening frame body 86a of the entrance/exit 84, the protective door 10 can be opened in two different ways: inward-opening and outward-opening.

Furthermore, the horizontal stay member 12a located at the top in the vertical direction Y may have a fixing means 22 at at least one end, on the opening/closing axis 32 side or the opening/closing end 34 side of the safety frame 80, for fixing the protective door 10 and the safety frame 80 together when the protective door 10 is fully closed and maintaining the fully closed state of the protective door 10. Examples of such fixing means 22 include a through hole 24 provided in the end of the horizontal stay member 12a and in the frame body 82a that forms the periphery of the entrance/exit edge of the safety frame 80, and a bolt 26 inserted into this through hole 24. Furthermore, although not shown, this fixing means 22 may also include a nut that threads onto the bolt 26.

There are no particular restrictions on the shape of the vertical stay members 14, as long as they are capable of supporting the horizontal stay members 12. For example, the vertical stay members 14 may be cylindrical members with a circular cross section perpendicular to the vertical direction, and metal pipe material may also be used.

Furthermore, in the protective door 10 of this embodiment, all or part of the widthwise inner side between at least two vertical stay members 14 may be made of a plate-shaped or mesh-shaped member. In other words, the protective door 10 may be configured such that at least part of the widthwise inner side of the multiple vertical stay members 14 is made of a plate-shaped or mesh-shaped member.

Next, one embodiment of the safety frame of the present invention will be described. The safety frame of this embodiment is provided on the roof portion 92 above the grain dryer 100, as shown in Figures 1 to 4, and includes a frame (safety frame 80 in Figures 1 to 4) that defines a predetermined space within the roof portion, and the protective door 10 described above. The safety frame of this embodiment includes the protective door 10 described above, and effectively improves the safety and convenience of workers within the safety frame 80. The safety frame of this embodiment is not limited to being provided on the roof portion 92 above the grain dryer 100; for example, although not shown, it may be provided on the roof portion above various grain storage tanks, such as for unhulled rice, brown rice, or processed rice.

There are no particular limitations on the frame that constitutes the safety frame 80; it need only define a predetermined space within the roof portion 92 above the grain dryer 100 and have an entrance 84 along part of its periphery for installing a protective door 10. For example, the frame that constitutes the safety frame 80 may include multiple pillars erected on the installation surface of the roof portion 92 of the grain dryer 100 and horizontal members spanning between adjacent pillars. The horizontal members terminate at the entrance 84 of the safety frame 80, and opening frames 86a, 86b extending in the vertical direction Y are provided as vertical frames 85a, 85b on one side and the other of the entrance 84. The protective door 10 described above is installed within these opening frames 86a, 86b.

The opening frames 86a, 86b that make up the vertical frames 85a, 85b on one side and the other side of the entrance/exit 84 are preferably cylindrical members with a circular cross section perpendicular to the vertical direction. By using cylindrical opening frames 86a, 86b, the opening/closing shaft 32 formed by connecting with the first connecting recess 16a of the horizontal stay members 12b, 12c of the protective door 10 can open and close the protective door 10 more smoothly.

In addition, while Figures 1 to 4 show an example in which the frame body constituting the safety frame 80 has one entrance/exit 84, multiple entrances 84 may be provided around the periphery that defines a specific space within the roof portion 92, with a protective door 10 installed for each entrance/exit 84. Each protective door 10 may be temporarily closed using the securing means 22 of the protective door 10 depending on its usage status and frequency of use. For example, a protective door 10 that is used less frequently may be secured to the safety frame 80 using the securing means 22 described above and temporarily maintained in a fully closed state. The safety frame 80 may have a total of four entrances 84, for example, one each on the front and rear sides of the roof portion 92 of the grain dryer 100, and one each on the left and right side. Furthermore, the safety frame 80 may have a total of eight entrances 84, allowing for the installation of two types of protective doors 10, one that opens inward and one that opens outward, on each of the front, rear, and left and right side surfaces.

For example, the roof 92 of the grain dryer 100 is equipped with piping such as a roof duct, and such piping can interfere with the opening and closing of the protective door 10. For this reason, multiple entrances 84 can be provided in the safety frame 80 in advance, and the entrances 84 to be used can be selected appropriately depending on the layout of the piping, etc., while the other entrances 84 can be temporarily closed by the protective door 10. As explained above, the protective door 10 has sufficient functionality to connect the safety frames 80 together and maintain their strength, so even when multiple entrances 84 are provided in the safety frame 80, the strength of the safety frame 80 can be maintained satisfactorily. A temporarily closed protective door 10 can be easily reopened by releasing the fastening means 22, so it can be restored to its door function and used as needed depending on the work situation within the roof 92, etc.

Next, we will describe one embodiment of a grain dryer with a safety frame of the present invention. The grain dryer with a safety frame of this embodiment includes a grain dryer 100 and a safety frame 80 provided above the roof portion 92 of the grain dryer 100, as shown in Figures 1 to 4. The safety frame 80 has a protective door 10 installed at its entrance/exit 84. The grain dryer with a safety frame of this embodiment has the protective door 10 described above installed at the entrance/exit 84 of the safety frame 80, which effectively improves the safety and convenience of workers within the safety frame 80.

There are no particular restrictions on the configuration of the grain dryer 100. For example, the grain dryer 100 may include, within the dryer body of the grain dryer 100, a storage section 90 for storing grain, a drying section (not shown) for drying the grain, and a circulation mechanism section (not shown) such as a grain collection section that discharges the dried grain by rotating a discharge valve (rotary valve), drops it into a grain flow trough below, and circulates it using a lower conveying mechanism.

Next, we will explain one embodiment of the safety-framed grain storage tank of the present invention. Although not shown in the drawings, the safety-framed grain storage tank of this embodiment comprises a grain storage tank for storing grain and a safety frame attached above the roof. The safety frame has a protective door installed at its entrance. The safety-framed grain storage tank of this embodiment has the protective door described above installed at the entrance to the safety frame, which effectively improves the safety and convenience of workers within the safety frame. Examples of grain storage tanks include various types of grain storage tanks, such as those for unhulled rice, brown rice, and processed rice.

The safety frame, safety frame-equipped grain dryer, and grain storage tank of the present invention are not limited to the embodiments described above, as long as they are equipped with the removable protective door 10 described above.

The protective door of the present invention can be used as a protective door for the entrance and exit of a roof safety frame installed above the roof of a grain dryer or grain storage tank.

10: Protection door 12, 12a, 12b, 12c: Horizontal stay member 14, 14a, 14b: Vertical stay member 16: Connection recess 16a: Connection recess (first connection recess)
16b: connecting recess (second connecting recess)
20: Frame holding aid 22: Fixing means 24: Through hole 26: Bolt 28: Bolt 32: Opening/closing shaft 34: Opening/closing end 80: Safety frame 82: Frame body 82a: Frame body (frame body constituting the periphery of the entrance/exit)
84: Entrance/exit 85a: Vertical frame (one of the vertical frames)
85b: Vertical frame (the other vertical frame)
86, 86a, 86b: Opening frame 90: Storage section 92: Roof section 100: Grain dryer

Claims (12)

A protective door installed at the entrance and exit of a safety frame provided above the roof of a grain dryer or a grain storage tank that stores grain,
At least three horizontal stay members extending in the width direction of the entrance of the safety frame, and at least two vertical stay members extending in the vertical direction of the entrance and supporting the at least three horizontal stay members at intervals in the vertical direction,
At least two or more of the horizontal stay members have a first connecting recess at one end thereof that connects to an opening frame body that is provided as one vertical frame of the entrance/exit of the safety frame, and a second connecting recess at the other end thereof that connects to an opening frame body that is provided as the other vertical frame of the entrance/exit of the safety frame,
One of the first and second connecting recesses of the horizontal stay member is detachably attached to the opening frame body as the vertical frame of one of the entrances and exits of the safety frame, and forms an opening/closing axis that supports the protective door in a rotatable state with the opening frame body as a fulcrum, and
The other of the first and second connecting recesses of the horizontal stay member is detachably connected to the opening frame body as the other vertical frame of the entrance of the safety frame when the protective door is fully closed, thereby forming an opening and closing end of the protective door,
A protective door for the roof safety frame of a grain dryer or grain storage tank, which is an opening and closing door for the entrance and exit of the safety frame, and is configured to become part of the safety frame when fully closed, connecting the safety frame and maintaining its strength. The protective door described in claim 1, wherein the horizontal stay member located at the top in the vertical direction has mating recesses at both ends that are recessed downward in the vertical direction, and when the protective door is fully closed, the mating recesses are fitted over the frame body that forms the periphery of the entrance/exit edge of the safety frame from above. A protective door as described in claim 1 or 2, wherein the horizontal stay member located at the top in the vertical direction is a member with a U-shaped cross section that is recessed downward in the vertical direction. The protective door according to any one of claims 1 to 3 further comprises a frame holding aid disposed at the end of the horizontal stay member on the opening/closing axis side so as to cover the opening side of the connecting recess when connected to the opening frame of the safety frame, and holding the opening frame within the connecting recess. A protective door as described in any one of claims 1 to 4, wherein the vertical stay member is arranged to penetrate a portion of the horizontal stay member. A protective door according to any one of claims 1 to 5, wherein the vertical stay member is a cylindrical member having a circular cross section perpendicular to the vertical direction. A protective door as described in any one of claims 1 to 6, wherein all or part of the widthwise inner space between at least two of the vertical stay members is constructed of a plate-like or mesh-like member. A protective door according to any one of claims 1 to 7, wherein the horizontal stay member located at the top in the vertical direction has a fixing means at at least one end on the opening/closing axis side or the opening/closing end side of the safety frame for fixing the protective door and the safety frame together when the protective door is fully closed and maintaining the protective door in a fully closed state. The protective door of claim 8, wherein the fixing means includes through holes provided in the end of the horizontal stay member and in the frame body that forms the periphery of the entrance/exit edge of the safety frame, and bolts inserted into the through holes. A safety frame comprising a frame body attached to the roof portion above a grain dryer or grain storage tank, which defines a predetermined space within the roof portion, and a protective door according to any one of claims 1 to 9. A grain dryer with a safety frame, comprising a grain dryer and the safety frame described in claim 10, which is provided above the roof portion of the grain dryer. A grain storage tank with a safety frame, comprising a grain storage tank and the safety frame described in claim 10, provided above the roof portion of the grain storage tank.