Floor heater device

Abstract

A floor heater device having high electric heat efficiency and easy maintenance is provided. [Solution] The present invention has a floor heater unit that is removably stored in a recess in the floor surface of the entrance / exit of a freezer / refrigerator warehouse, and the floor heater unit comprises a frame body that is stored in the recess, a checkered steel plate that is removably placed on the frame body and closes the upper surface of the recess, a floor heater provided below the checkered steel plate, a first insulating material provided below the floor heater, a supporting steel plate provided below the first insulating material, and a second insulating material provided below the supporting steel plate, and the floor heater unit is stored in the frame body while forming multiple layers from top to bottom in the order of floor heater, first insulating material, supporting steel plate, and second insulating material, and the frame body is formed integrally with the checkered steel plate by a fixing means in a manner that houses the floor heater, first insulating material, supporting steel plate, and second insulating material.

Description

[Technical field]

[0001] The present invention relates to a floor heater device for preventing freezing of the floor surface at the entrance and exit of a refrigerated or frozen warehouse. [Background technology]

[0002] Conventionally, in air-conditioned warehouses (e.g., refrigerated or frozen warehouses, hereafter referred to as warehouses), workers use materials handling vehicles (hereafter referred to as forklifts) to carry in and out cargo. The entrances and exits of warehouses are covered with retractable shutters to maintain a constant temperature inside the warehouse. Therefore, when the shutters are opened to carry in and out cargo using forklifts, air containing moisture flows into the warehouse, and the air that has flowed in is cooled, causing partial freezing of the floor surface near the entrance and exit of the warehouse. When partial freezing occurs on the floor surface near the entrance and exit of the warehouse in this way, the straight-line stability of carts and forklifts passing through the entrance and exit is impaired, and there is a risk of them colliding with the doors and walls that constitute the entrance and exit of the warehouse.

[0003] To solve this problem, there is a method of embedding a heater (e.g., an electric heater) in the floor of the entrance and exit of the warehouse to warm the floor surface and prevent freezing of the floor surface that corresponds to the path of the forklift. However, with this method, the heater may break down or the wiring that supplies power to the heater may break due to vibrations from the carts and forklifts traveling above. In addition, since the heater is a consumable item, it is necessary to replace the parts periodically to maintain normal function. In order to replace or repair the heater or wiring embedded in the floor, it is necessary to chip the concrete of the floor, replace the heater or wiring, and then pour concrete again, which not only makes the construction large-scale but also increases the construction time and cost.

[0004] In order to solve the above-mentioned problems, Patent Document 1 discloses an anti-freezing device for the periphery of a warehouse entrance in which a support platform with multiple floor heaters is fixed to the floor surface of the warehouse entrance and the support platform is covered from above with a protective cover that is fixed so that the upper surface of the protective cover is flush with the upper surface of the warehouse entrance floor.

[0005] Patent Document 2 discloses a floor heater device having a frame fixed to the ground or floor surface with an open top, a grating with multiple grooves, a heater fitted into at least some of the multiple grooves provided in the grating, and a plate-like member placed on the grating to close the opening in the ground or floor surface. It is described that with this configuration, the heater stored in the ground or floor surface can be replaced simply by removing the plate-like member that closes the opening in the ground or floor surface. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-133452 [Patent Document 2] Patent No. 7369408 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the floor heater device described in Patent Document 1 has a support base equipped with a heater that is fixed to the floor surface of the warehouse entrance, so if the support base is distorted by heavy objects such as a forklift, it takes a long time to replace the support base.

[0008] Furthermore, in the floor heater device described in Patent Document 2, the heater can be exposed simply by removing the plate-shaped member placed on the grating, making it easy to replace the heater stored in the recessed part of the floor. However, because the heater is supported by sand, the heat generated by the heater escapes downward, preventing efficient heat transfer to the plate-shaped member.

[0009] Furthermore, in the floor heater device described in Patent Document 2, part of the heater is in contact with the plate-shaped member and the heater is supported by sand. Therefore, when the plate-shaped member is pressed downward by a heavy forklift and bent downward, the heater is pressed downward by the plate-shaped member and the contact between the heater and the plate-shaped member is released, reducing the efficiency of heat transfer from the heater to the plate-shaped member, and there is a risk that the plate-shaped member cannot be heated to a constant temperature.

[0010] Furthermore, in the floor heater device described in Patent Document 2, the heater is supported by sand, so when replacing the heater, there is a risk that the sand supporting the heater will be scattered around the device or onto the warehouse floor, etc., making maintenance work complicated.

[0011] Furthermore, like the floor heater device described in Patent Document 1, the floor heater device described in Patent Document 2 has a frame forming the device that is fixed to a recess formed in the floor surface of the storehouse opening, so if the frame becomes distorted, it takes a long time to replace the floor heater device.

[0012] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a floor heater device that has high heat transfer efficiency and is easy to maintain. [Means for solving the problem]

[0013] A first aspect of the present invention is a floor heater device installed on the floor surface at the entrance / exit of a freezer / refrigerator warehouse for storing cargo that is kept at low temperatures, the floor heater unit being removably stored in a recess in the floor surface, the floor heater unit comprising a frame body stored in the recess, a checkered steel plate that is removably placed on the frame body and closes the upper surface of the recess, a floor heater installed below the checkered steel plate, a first insulating material installed below the floor heater, a supporting steel plate installed below the first insulating material, and a second insulating material installed below the supporting steel plate, the floor heater unit being stored in the frame body while forming multiple layers from top to bottom in the order of the floor heater, the first insulating material, the supporting steel plate, and the second insulating material, and the frame body being formed integrally with the checkered steel plate by a fixing means in an aspect in which the floor heater, the first insulating material, the supporting steel plate, and the second insulating material are stored.

[0014] Another aspect of the present invention is one further comprising a horizontal adjustment section which supports the floor heater section in an approximately horizontal position when stored in the recess, the frame body having a frame section arranged along the side wall forming the recess, and a support section mounted on an opposing surface of the frame section in the storage space enclosed by the frame section, the horizontal adjustment section comprising a horizontal adjustment plate which is placed on the bottom surface of the recess for keeping the frame body in a horizontal position, and the bottom surfaces of the frame section and the support section are supported by the horizontal adjustment plate.

[0015] In another aspect of the present invention, the checkered steel plate and the frame are fixed to the level adjustment plate by the fixing means.

[0016] Another aspect of the present invention is one which further has a horizontal adjustment section which supports the floor heater section in an approximately horizontal position when stored in the recess, and which has a horizontal adjustment plate on the bottom surface of the recess for keeping the frame body horizontal, and a sway regulating body which is placed on the horizontal adjustment plate and is interposed between the frame body and the side wall of the recess, and which is characterized in that the horizontal adjustment plate and the sway regulating body are formed as a single unit. Effect of the Invention

[0017] A first aspect of the present invention is a floor heater device provided on the floor surface at the entrance / exit of a freezer / refrigerator warehouse for storing cargo that is to be kept at low temperature, the floor heater device having a floor heater unit that is removably stored in a recess in the floor surface, the floor heater unit comprising a frame body that is stored in the recess, a checkered steel plate that is removably placed on the frame body and closes an upper surface of the recess, a floor heater provided below the checkered steel plate, a first insulating material provided below the floor heater, a supporting steel plate provided below the first insulating material, and a second insulating material provided below the supporting steel plate. and a material, wherein the floor heater unit is housed in the frame body while forming multiple layers from top to bottom in the order of the floor heater, the first insulating material, the supporting steel plate, and the second insulating material, and the frame body is integrally formed with the checkered steel plate by a fixing means in a manner in which the floor heater, the first insulating material, the supporting steel plate, and the second insulating material are housed therein. Therefore, in the event of a heater failure, only the floor heater unit housed in the recessed portion of the floor surface can be replaced, thereby shortening the time required for the floor heater device replacement work and improving the operating efficiency of the refrigerated / freezer warehouse.

[0018] In addition, because the checkered steel plate that closes the opening of the recess in the floor of the storage compartment is supported by the entire frame, durability against heavy objects is improved and the likelihood of the frame being distorted is reduced. Even if the frame is distorted, since the floor heater unit is simply stored in the recess in the floor, it is possible to replace only the floor heater unit without removing the checkered steel plate, making maintenance of a broken floor heater easy.

[0019] Another aspect of the present invention further has a horizontal adjustment section which supports the floor heater section in an approximately horizontal position when stored in the recess, and the frame body has a frame section which is arranged to follow the side wall which forms the recess, and a support section which is mounted on the opposing surface of the frame section in the storage space enclosed by the frame section, and the horizontal adjustment section has a horizontal adjustment plate which is placed on the bottom surface of the recess for keeping the frame body horizontal, and by supporting the bottom surfaces of the frame section and the support section with the horizontal adjustment plate, the upper surface of the checkered steel plate can be made parallel to the floor surface, and the load applied from the checkered steel plate to the frame section and support section can be evenly distributed, preventing deformation of the frame body.

[0020] In another aspect of the present invention, since the checkered steel plate and the frame are fixed to the level adjustment plate by the fixing means, the floor heater unit can be removed from the recess simply by removing the fixing means that connects the level adjustment plate and the checkered steel plate. In other words, since the fixing means can be used to switch between fixing and releasing the floor heater unit, the work time required for replacing the floor heater unit can be shortened.

[0021] In another aspect of the present invention, the floor heater unit further includes a horizontal adjustment unit that supports the floor heater unit in a substantially horizontal state when the floor heater unit is stored in the recess, and the horizontal adjustment unit includes a horizontal adjustment plate for horizontally aligning the frame body on the bottom surface of the recess, and a swing restriction body that is placed on the horizontal adjustment plate and is interposed between the frame body and the side wall of the recess, and since the horizontal adjustment plate and the swing restriction body are integrally formed, the checkered steel plate can be horizontally aligned by simply placing the frame body on the horizontal adjustment plate, and the load applied from the checkered steel plate to the frame part and the support part can be evenly distributed, and deformation of the frame body can be prevented. In addition, since the swing restriction body is interposed between the frame body and the side wall of the recess, the frame part provided inside the swing restriction body comes into contact with the inner peripheral wall surface of the swing restriction body, thereby restricting the swing of the frame body in the forward / backward and left / right directions, and the swing of the frame body can be restricted without fixing the frame body to the horizontal adjustment plate. In other words, the position of the frame body within the recess can be regulated without using fixing members such as anchor bolts, and the floor heater unit can be easily removed from the recess while regulating the oscillation of the frame body, making it easy to install and maintain the floor heater device. [Brief description of the drawings]

[0022] [Figure 1] 1 is a diagram showing a refrigerated / freezer warehouse in which a floor heater device according to a first embodiment of the present invention is installed. [Diagram 2] FIG. 1 is a diagram showing an installation location of a floor heater device according to a first embodiment of the present invention. [Diagram 3] FIG. 1 is an exploded perspective view showing a configuration of a floor heater device according to a first embodiment of the present invention. [Figure 4] FIG. 1 is a diagram showing the configuration of a frame of a floor heater unit according to a first embodiment of the present invention, where (a) is a plan view and (b) is a cross-sectional view taken along line AA of (a). [Diagram 5] FIG. 1 is a cross-sectional view illustrating a configuration of a floor heater device according to a first embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged cross-sectional view of a portion of FIG. [Figure 7] 1A to 1C are diagrams showing an installation procedure of the floor heater device according to the first embodiment of the present invention. [Figure 8] 1A to 1C are diagrams showing an installation procedure of the floor heater device according to the first embodiment of the present invention. [Figure 9] FIG. 5 is an exploded perspective view showing the configuration of a floor heater device according to a second embodiment of the present invention. [Figure 10] FIG. 5 is a diagram showing the configuration of a floor heater device according to a second embodiment of the present invention, where (a) is a plan view and (b) is a cross-sectional view taken along line BB in (a). [Figure 11] FIG. 4 is a cross-sectional view illustrating the configuration of a floor heater device according to a second embodiment of the present invention. [Figure 12] FIG. 12 is a partially enlarged cross-sectional view of FIG. [Figure 13] 6A to 6C are diagrams showing an installation procedure of a floor heater device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention relates to a floor heater device that has an innovative configuration for supporting and fixing an anti-freeze heater that is installed on the floor surface at the entrances and exits of refrigerated and frozen warehouses, thereby maintaining the high electric thermal efficiency of the floor heater device and allowing easy replacement work to be performed even if the heater breaks down or the frame that houses the heater is distorted.

[0024] The overall configuration of a floor heater device 1 according to an embodiment of the present invention will be described with reference to Figs. 1 to 6. Fig. 1 is a plan view showing a refrigerated / freezer warehouse S in which the floor heater device 1 is installed, and Fig. 2 is an enlarged perspective view of the installation portion of the floor heater device 1. Fig. 3 is an exploded perspective view showing the configuration of the floor heater device 1. Fig. 4 is a view showing the configuration of a frame body 20. Fig. 5 is a schematic cross-sectional view showing the state in which the floor heater device 1 is installed in the recessed portion C. Fig. 6 is an enlarged view of the portion surrounded by the two-dot chain line in Fig. 5. Hereinafter, an embodiment of the floor heater device 1 of the present invention will be described with reference to the drawings. In addition, in describing this embodiment, the directions shown in Fig. 1 are the "front side", "rear side", "right side", and "left side", and the "upper side" is the ceiling surface side and the "lower side" is the floor surface FL side. In other words, the "front side" refers to the inside of the refrigerated / freezer warehouse S in which the floor heater device 1 is installed, and the "rear side" refers to the outside of the refrigerated / freezer warehouse S in which the floor heater device 1 is installed.

[0025] First Embodiment As shown in Figures 1 to 3, the floor heater device 1 has a floor heater unit 2 that is stored and installed in a recess C provided in the floor surface FL of the entrance / exit SE of the refrigerated / freezer warehouse S, and a horizontal adjustment unit 3 that is installed on the bottom surface of the recess C and supports the floor heater unit 2 in an approximately horizontal position.

[0026] The floor heater unit 2 comprises a frame body 20 that is stored and installed in the recess C, a checkered steel plate 21 that is removably placed on the frame body 20 and closes the opening of the recess C, a floor heater 22 provided below the checkered steel plate 21, a first insulating material 23 provided below the floor heater 22, a supporting steel plate 24 provided below the first insulating material 23, and a second insulating material 25 provided below the supporting steel plate 24.

[0027] As shown in FIG. 3, the frame body 20 has a frame portion 201 and support portions 202 that are provided across opposing surfaces of the frame portion 201.

[0028] The frame 201 has front, rear, left and right walls 203 formed in a flat plate shape. The frame 201 is formed in a substantially rectangular shape in a plan view by connecting an end of one wall 203 to an end of another adjacent wall 203 so that the end is perpendicular to the end of the other wall 203. The frame 201 has a storage space 204 in a space surrounded by the front, rear, left and right walls 203.

[0029] As shown in FIGS. 3 and 4, the wall body 203 has an outer wall portion 203a that forms the outer periphery of the wall body 203, and an inner wall portion 203b that is formed integrally with the outer wall portion 203a on the inner circumferential surface of the outer wall portion 203a.

[0030] The outer wall portion 203a is formed at a height such that its upper end portion is approximately flush with the floor surface FL when the frame body 20 is installed in the recessed portion C. The inner wall portion 203b is formed so that its lower end portion is approximately flush with the outer wall portion 203a and its height is lower than that of the outer wall portion 203a. In other words, the outer wall portion 203a and the inner wall portion 203b form a checkered steel plate support portion 203c for supporting the checkered steel plate 21 on the upper portion of the wall body 203.

[0031] The checkered steel plate support portion 203c has a steel plate support surface portion 203d formed on the upper end portion of the inner wall portion 203b, and a steel plate regulating wall portion 203e formed on the inner surface of the outer wall portion 203a and rising vertically from the outer edge portion of the steel plate support surface portion 203d.

[0032] The steel plate support surface portion 203d is a flat surface formed substantially parallel to the upper surface of the outer wall portion 203a. In other words, the steel plate support surface portion 203d is formed substantially parallel to the floor surface FL when the frame body 20 is placed in the recessed portion C. The steel plate support surface portion 203d also has an integration hole portion 203f provided near the corner, and a fixing hole portion 203g for fixing the checkered steel plate 21 to the frame body 20.

[0033] The integral hole 203f is formed with a substantially constant diameter through the steel plate support surface portion 203d from the upper end to the lower end. A fixing means 40 such as a bolt is inserted into this integral hole 203f and its tip is screwed into a horizontal adjustment plate 30 constituting a horizontal adjustment portion 3 described later, whereby the checkered steel plate 21 and the frame body 20 are stored and fixed in the recess C. The head of the bolt inserted into the integral hole 203f is stored in a countersunk portion of the checkered steel plate 21 and is arranged so as not to protrude from the upper surface of the checkered steel plate 21.

[0034] The fixing holes 203g are provided at equal intervals between adjacent integral holes 203f on the steel plate support surface 203d. The fixing holes 203g are formed in a substantially circular shape in a plan view, and a female thread is threaded on the inner peripheral surface. This allows the checkered steel plate 21 and the frame 20 to be integrally fixed by screwing the tip of a fixing member such as a bolt inserted into the checkered steel plate 21 into the fixing hole 203g. The head of the bolt screwed into the fixing hole 203g is housed in the countersunk portion of the checkered steel plate 21 and is arranged so as not to protrude from the upper surface of the checkered steel plate 21.

[0035] The steel plate restricting wall surface portion 203e is formed on the upper part of the inner peripheral surface of the outer wall portion 203a. The steel plate restricting wall surface portion 203e is formed on all the outer wall portions 203a constituting the front, rear, left and right walls 203, and is formed in a substantially rectangular shape in a plan view. The steel plate restricting wall surface portion 203e is formed to be slightly larger than the outer shape of the checkered steel plate 21 in a plan view. This allows the checkered steel plate 21 to be easily placed on the inside of the steel plate restricting wall surface portion 203e and on the upper surface of the steel plate supporting surface portion 203d when the checkered steel plate 21 is supported by the steel plate supporting surface portion 203d. In other words, the steel plate restricting wall surface portion 203e functions as a swing restricting wall for restricting the checkered steel plate 21 placed on the steel plate supporting surface portion 203d from swinging back and forth and left and right.

[0036] As shown in FIGS. 3 and 4, the support portion 202 has a checkered steel plate support 205 installed on the front and rear walls 203, 203 that constitute the frame portion 201, and a supporting steel plate support 206 provided on the checkered steel plate support 205.

[0037] As shown in Figs. 4 and 5, the checkered steel plate support 205 is formed in a rectangular tube shape with a hollow interior in cross section. The checkered steel plate support 205 is provided approximately parallel to the left and right walls 203. The checkered steel plate support 205 is formed at approximately the same height as the vertical height of the inner wall 203b of the wall 203 constituting the frame 201. In other words, the upper surface of the checkered steel plate support 205 and the steel plate support surface 203d on the upper surface of the inner wall 203b are located on approximately the same horizontal plane. This allows the checkered steel plate 21 placed on the upper surface of the frame 201 to be supported by the steel plate support surface 203d of the front, rear, left and right walls 203 and the checkered steel plate support 205 provided approximately parallel to the left and right walls 203. Therefore, by configuring the frame body 20 in this manner, the load generated on the upper surface of the frame body 20 is distributed to the steel plate support surface portion 203d of the wall body 203 and the checkered steel plate support body 205, thereby improving the rigidity of the frame body 20.

[0038] Furthermore, a plurality of checkered steel plate supports 205 are provided so as to divide the storage space 204 surrounded by the front, rear, left and right walls 203 into a plurality of heating spaces 207. In this embodiment, a configuration in which six checkered steel plate supports 205 are provided side by side on the left and right walls 203, 203 is exemplified. However, the number of checkered steel plate supports 205 is not limited to six, and any number may be provided as long as the storage space 204 can be divided into a plurality of heating spaces 207 and the checkered steel plate 21 can be prevented from bending when a forklift F or a cart passes over the checkered steel plate 21.

[0039] As shown in FIG. 6, the support steel plate support 206 is provided at approximately the center in the vertical direction of the checkered steel plate support 205. The support steel plate support 206 has a support steel plate support part 206a extending approximately horizontally toward the adjacent checkered steel plate support 205, and a fixing part 206b bending downward by 90 degrees from the base end of the support steel plate support part 206a and extending in a direction along the vertical direction of the checkered steel plate support 205. The support steel plate support 206 is formed into an inverted "L" shape in cross section by the support steel plate support part 206a and the fixing part 206b. The support steel plate support 206 is fixed by inserting a fixing means such as a bolt into the fixing part 206b and screwing its tip part into the side of the checkered steel plate support 205.

[0040] The frame body 20 is formed in this manner, and the checkered steel plate 21 is placed on the upper surface of the frame body 20. A fixing means 40 such as a bolt is inserted into the integral hole portion 203f and its tip is screwed into the horizontal adjustment plate 30, thereby fixing the floor heater device 1 in the recess C while being integrated with the checkered steel plate 21.

[0041] The checkered steel plate 21 is a rectangular steel plate, and the surface is continuously treated with an anti-slip treatment. The checkered steel plate 21 has holes 210 for inserting fixing means 40 such as bolts at positions corresponding to the steel plate support surface 203d and the checkered steel plate support 205. The holes 210 have countersunk holes to prevent the heads of the bolts inserted in the holes from protruding upward from the checkered steel plate 21. The checkered steel plate 21 is placed on the upper surface of the frame 20, and while closing the opening of the recess C provided in the floor surface FL, it is fixed to the frame 20 and the horizontal adjustment plate 30 by the fixing means 40, so that the checkered steel plate 21 can be stored in the storage space 204 of the frame 20 while maintaining the positional relationship of various members constituting the floor heater device 1. When closing the opening of the recess C, the checkered steel plate 21 is supported and fixed to the checkered steel plate support 205 and the steel plate support surface 203d of the wall 203. The checkered steel plate 21 is fixed to the checkered steel plate support 205 and the steel plate support surface 203d using fixing means 40 such as bolts. When replacing the floor heater device 1, the checkered steel plate 21 can be removed from the recess C by removing the fixing means 40 which is inserted into the integration hole 203f of the steel plate support surface 203d and screwed into the level adjustment plate 30 provided on the bottom surface of the recess C, and then screwing a hanging means such as an eyebolt into the part from which the fixing means 40 was removed, thereby integrating the checkered steel plate 21 and the frame 20 and lifting the floor heater unit 2 via the eyebolt.

[0042] The floor heater 22 is provided in a heating space 207 surrounded by front, rear, left and right walls 203. The floor heater 22 is a panel heater formed in a rectangular plate shape in a plan view, and is formed slightly smaller than the distance between adjacent checkered steel plate supports 205 that form the heating space 207. In other words, the floor heater 22 is formed to a size that can be stored in the heating space 207. The floor heater 22 is provided in each heating space 207 (six floor heaters are installed in this embodiment). Wiring L for supplying power is exposed on the side of the floor heater 22 (see FIG. 8). Electric power is supplied to the floor heater 22 by connecting the wiring L of the floor heater 22 and one end of the wiring L arranged in the connection space P on the side of the floor heater 22 to a wiring connected to a power source. In other words, the floor heater 22 can switch between a connected state and a disconnected state of the wiring L in the connection space P provided in the cinder concrete K near the recess C. Furthermore, when replacing the floor heater device 1, the connection between the wiring on the power source side and the wiring L on the floor heater 22 side in the connection space P is released, so that the floor heater device 1 can be replaced without having to consider the wiring L. In this embodiment, an electric heater or the like is preferably used as the floor heater 22.

[0043] The first insulating material 23 is preferably made of glass wool, which has excellent heat insulation and heat retention properties. The first insulating material 23 is formed in a rectangular shape having a predetermined thickness, similar to the floor heater 22 placed on the top, and is provided in each heating space 207 formed between adjacent checkered steel plate supports 205. The glass wool provided as the first insulating material 23 is made of glass fiber and has an air layer trapped between the fibers. The glass wool has excellent heat insulation and heat retention properties due to the air layer, and also has elasticity. By providing the first insulating material 23 in each heating space 207 in this way, the heat generated by the floor heater 22 can be prevented from being transferred downward from the floor heater 22, and the checkered steel plate 21 can be efficiently heated. In addition, by providing the first insulating material 23 with elasticity, the floor heater 22 placed on the first insulating material 23 can be pressed upward to contact the checkered steel plate 21. In addition, the first insulating material 23 has a certain elasticity, and thus can reduce the load on the floor heater 22. In other words, even if the checkered steel plate 21 bends downward from above and presses the floor heater 22 downward, the load on the floor heater 22 can be absorbed. In addition, since the first insulating material 23 is made of glass wool, even if a spark occurs in the wiring supplying power to the floor heater 22, the first insulating material 23 can be prevented from burning because the glass wool is flame retardant, and safety can be ensured. Note that the first insulating material 23 is not limited to glass wool, and may be made of any material as long as it has an air layer, and has thermal insulation, heat retention, and elasticity.

[0044] The support steel plate 24 is a steel plate formed in a rectangular thin plate shape. The support steel plate 24 is located below the first insulation material 23 and supports the first insulation material 23. The support steel plate 24 is provided in each heating space 207. The support steel plate 24 is supported by the support steel plate support portion 206a of the support steel plate supporter 206. In other words, the support steel plate 24 is located approximately in the center in the up-down direction of the checkered steel plate supporter 205. In other words, the support steel plate 24 is provided at a certain distance above the bottom surface of the recess C. The support steel plate 24 has a plurality of holes 241 drilled in the up-down direction (see FIG. 3). As will be described in more detail below, by providing multiple holes 241 in the supporting steel plate 24, it is possible to spray foamed urethane (rigid urethane foam), which is the second insulating material 25, from the holes 241 between the level adjustment plate 30 and the supporting steel plate 24, to form the second insulating material 25 between the level adjustment plate 30 and the supporting steel plate 24.

[0045] The second insulating material 25 is formed of, for example, urethane foam (rigid urethane foam) having a predetermined strength. The second insulating material 25 is for insulating between the level adjustment plate 30 and the supporting steel plate 24. The foamed urethane provided as the second insulating material 25 has countless fine bubbles, and air is trapped inside the bubbles. The foamed urethane can effectively suppress heat conduction by the air trapped inside the bubbles. This suppresses the heat generated by the floor heater 22 from being transferred to the second insulating material 25 via the first insulating material 23 and then to the level adjustment plate 30, thereby efficiently heating the checkered steel plate 21. In addition, since the configuration is such that the foamed urethane, which is the second insulating material 25, is filled between the supporting steel plate 24 and the level adjustment plate 30 through the hole portion 241 provided in the supporting steel plate 24, the urethane resin after foaming is bonded to the supporting steel plate 24 and the checkered steel plate support 205 and becomes one with these members. At this time, a release agent has been applied to the level adjustment plate 30 in advance, so that the second insulating material 25 is not adhered to the level adjustment plate 30. With this configuration, the floor heater unit 2 can be easily removed from the recess C. In addition, the urethane foam that is the second insulating material 25 penetrates into the fine irregularities formed on the surfaces of the checkered steel plate support 205, the supporting steel plate support 206, and the supporting steel plate 24, which are not coated with a release agent, and foams within the irregularities, thereby being formed integrally with the checkered steel plate support 205, the supporting steel plate support 206, and the supporting steel plate 24.

[0046] In this way, by making the floor heater section 2 a multi-layer structure using various members with different functions (checkered steel plate 21, floor heater 22, first insulating material 23, support steel plate 24, second insulating material 25), it is possible to prevent the heat generated by the floor heater 22 from being transferred to anything other than the checkered steel plate 21 placed on top of the floor heater 22, and it is possible to efficiently heat the checkered steel plate 21. Also, by providing the first insulating material 23 and the second insulating material 25 below the floor heater 22 of the floor heater device 1, it is possible to prevent the heat generated by the floor heater device 1 from being transferred to anything other than the checkered steel plate 21, and the heat is transferred to the floor surface FL in the refrigerated / freezer warehouse S, and the internal temperature of the refrigerated / freezer warehouse S does not rise, and the floor surface FL at the entrance and exit can be prevented from freezing.

[0047] In addition, the floor heater device 1 is configured to be integrated with the frame body 20 and the checkered steel plate 21, so that the floor heater section 2 can be easily replaced. In detail, the frame body 20 and the checkered steel plate 21 are fastened and fixed with a plurality of fixing means 40, the fixing means 40 is inserted into the integral hole portion 203f provided in the steel plate support surface portion 203d, and the tip portion of the fixing means 40 is screwed into the level adjustment plate 30 to fix the floor heater section 2 in the recess C. Therefore, the fixed state of the floor heater section 2 in the recess C can be released simply by releasing the screwed state between the level adjustment plate 30 and the fixing means 40. Therefore, the floor heater section 2 can be easily removed from the recess C and the floor heater device 1 can be easily replaced. At this time, the frame body 20 and the checkered steel plate 21 are fixed by other fixing means 40, so the integrated state of the floor heater section 2 is not released. Therefore, the floor heater unit 2 described in this embodiment can be easily replaced by simply releasing the screwed state of the fixing means 40 screwed onto the horizontal adjustment plate 30, as the fixed state within the recess C is released.

[0048] In addition, since the wiring L for supplying power to the floor heater 22 is configured to be connected to the power supply wiring in a connection space P formed in a part of the floor surface FL different from the recess C, it can be connected to the wiring on the power supply side regardless of the installation work of the floor heater device 1, and the time required for the replacement work of the floor heater unit 2 can be shortened as much as possible.

[0049] The horizontal adjustment unit 3 is provided below the floor heater unit 2, and includes a horizontal adjustment plate 30 and an adjustment means for adjusting the upper surface of the horizontal adjustment plate 30 to be approximately horizontal.

[0050] The horizontal adjustment plate 30 is formed in a thin plate shape having a substantially rectangular shape. The horizontal adjustment plate 30 is formed to have a substantially identical outer shape to the frame portion 201 of the frame body 20. In other words, the outer periphery of the horizontal adjustment plate 30 and the frame portion 201 coincide with each other in a plan view.

[0051] The horizontal adjustment plate 30 also has fixing holes 31 for fixing the fixing means 40 near each corner, and adjustment holes 32 for fixing the plate to the bottom surface of the recessed portion C while keeping the upper surface horizontal. The horizontal adjustment plate 30 can integrally fix the checkered steel plate 21 and the frame body 20 by screwing the tip of the fixing means 40 into the fixing hole 31. The horizontal adjustment plate 30 also makes it possible to adjust the height of each part with respect to the bottom surface of the recessed portion C by screwing an adjustment means into the adjustment hole 32.

[0052] The horizontal adjustment section 3 is constructed in this manner, and the adjustment means is screwed into the adjustment hole 32 provided in the horizontal adjustment plate 30 to form the upper surface approximately horizontal, and the fixing means 40 is screwed into the fixing hole 31 to fix the checkered steel plate 21 and the frame body 20 together to the horizontal adjustment plate 30.

[0053] Then, the horizontal adjustment unit 3 configured in this manner is placed on the bottom surface of the recessed portion C, and its upper surface is adjusted to be approximately horizontal using the adjustment means while being fixed to the bottom surface of the recessed portion C. The fixing means 40 is screwed into the fixing hole portion 31, thereby completing the installation of the floor heater device 1 consisting of the floor heater unit 2 and the horizontal adjustment unit 3 within the recessed portion C.

[0054] <Installation Procedure> The procedure for installing the floor heater device 1 of the first embodiment in the recessed portion C will be described with reference to Figures 7 and 8. Figures 7(a) to (c) show the procedure from providing the level adjustment plate 30 in the recessed portion C to providing the support steel plate 24 on the support steel plate support portion 206a of each heating space 207. Figures 8(a) to (d) show the procedure from providing the support steel plate 24 in each heating space 207 to closing the opening of the recessed portion C with the checkered steel plate 21 and installing the floor heater device 1 in the recessed portion C.

[0055] As shown in Fig. 7(a), the floor surface FL is chipped, the floor heater embedded in the floor surface FL is removed, and a recess C for placing the floor heater device 1 is formed at the entrance SE of the refrigerated / freezer warehouse S. Then, a level adjustment plate 30 is laid on the bottom surface of the recess C formed in the floor surface FL. At this time, the level adjustment plate 30 is adjusted so that the upper surface is parallel to the floor surface FL by a plurality of adjustment means provided on the lower surface. The level adjustment plate 30 is also fixed to the bottom surface of the recess C by the adjustment means.

[0056] As shown in Fig. 7(b), the frame body 20 is provided on the upper surface of the level adjustment plate 30 placed on the bottom surface of the recessed portion C. At this time, the level adjustment plate 30 and the frame body 20 are not fixed. The storage space 204 formed in the recessed portion C is equally divided into six heating spaces 207 by the checkered steel plate support body 205 constituting the frame body 20.

[0057] Subsequently, as shown in FIG. 7(c), the supporting steel plates 24 are placed on the supporting steel plate supporting portions 206a of the supporting steel plate supports 206 constituting the frame 20, thereby dividing the heating space 207 into two spaces, upper and lower.

[0058] 8(a), urethane foam (rigid urethane foam) is sprayed from the holes 241 of the supporting steel plate 24 to form the second insulating material 25 between the supporting steel plate 24 and the bottom surface (the upper surface of the cinder concrete K). The second insulating material 25 is formed in all of the heating spaces 207.

[0059] 8(b), a member having a heat insulating effect, such as glass wool, is laid on the upper surface of the supporting steel plate 24, and the first heat insulating material 23 is disposed on the upper part of the supporting steel plate 24. The first heat insulating material 23 is provided in all of the heating spaces 207.

[0060] Next, as shown in Fig. 8(c), the floor heaters 22 are placed on the top of the first insulating materials 23. Then, the wiring L of the floor heaters 22 is connected to the power supply wiring with a connector or the like, so that power can be supplied to the floor heaters 22.

[0061] Next, as shown in FIG. 8(d), the checkered steel plate 21 is placed on the upper part of the floor heater 22, on the upper part of the wall body 203 and the checkered steel plate support 205 constituting the frame body 20. At this time, the checkered steel plate 21 is fixed to the wall body 203 and the checkered steel plate support 205 by fixing means 40 such as bolts, and is fixed to the level adjustment plate 30 through holes 210 provided at the corners of the checkered steel plate 21. As a result, the floor heater device 1 is stored and fixed in the recess C. In addition, the lower surface of the checkered steel plate 21 is in contact with the upper surface of the floor heater 22. However, since the load applied to the upper surface of the checkered steel plate 21 is distributed to the entire frame body 20 via the wall body 203 and the checkered steel plate support 205, the load from the checkered steel plate 21 is not directly generated on the floor heater 22. In other words, by forming the left and right width of the heating space 207 smaller than the width of the tires of the cart or forklift that passes over the checkered steel plate 21, the risk of the checkered steel plate 21 bending is reduced as much as possible, and the load from the cart or forklift is not directly applied to the floor heater 22, so that the possibility of the floor heater 22 breaking down can be reduced as much as possible. In addition, since the floor heater 22 is supported by the first insulating material 23 with an elastic effect having an air layer inside, it is always in contact with the checkered steel plate 21 due to the elastic effect of the first insulating material 23. Therefore, the heat generated by the floor heater 22 is transferred to the checkered steel plate 21 as much as possible, and a state in which the heat transfer efficiency to the checkered steel plate 21 is high can be maintained.

[0062] As described above, the floor heater device 1 according to this embodiment is installed in the recessed portion C in the procedure shown in Figures 7 and 8. Once the floor heater device 1 is installed in the recessed portion C, the frame 20, checkered steel plate 21, floor heater 22, first insulating material 23, support steel plate 24, and second insulating material 25 (i.e., the floor heater unit 2) can be removed as a unit from the recessed portion C by removing the fixing means 40 that fixes the checkered steel plate 21 and the level adjustment plate 30.

[0063] At this time, the floor heater unit 2 can be replaced with the level adjustment plate 30 laid on the floor surface of the recessed portion C. As a result, the work of Fig. 7(b), (c) and Fig. 8(a)-(d) is performed outside the recessed portion C to prepare the floor heater unit 2, the floor heater unit 2 already installed in the recessed portion C is removed, the replacement floor heater unit 2 formed outside the recessed portion C is installed in the recessed portion C, and the fixing means 40 is inserted into the hole 210 provided in the corner of the checkered steel plate 21 and its tip is fixed to the level adjustment plate 30, completing the replacement work of the floor heater device 1.

[0064] Then, after the floor heater device 1 is installed in the recess C, quick-drying patching mortar is poured between the outer peripheral surface of the wall body 203 and the inner peripheral surface of the recess C, so that the small gap formed between the wall body 203 and the recess C can be filled. The patching mortar has a characteristic that it is strong against compressive stress and weak against tensile stress. Therefore, in the embodiment in which the floor heater device 1 is installed in the recess C, only compressive stress is applied to the patching mortar from the forklift F, so that the swinging of the floor heater device 1 in the recess C can be restricted. When replacing the floor heater part 2, the floor heater part 2 is lifted up, so that a tensile load is generated in the patching mortar. As a result, when replacing the floor heater part 2, the patching mortar is easily broken, and there is no risk of interfering with the replacement work of the floor heater part 2.

[0065] Furthermore, in the floor heater device 1, the floor heater section 2 including the frame body 20 and the checkered steel plate 21 are integrally formed, so that the floor heater 22, the first insulating material 23, the support steel plate 24, and the second insulating material 25 provided in the storage space 204 of the recessed portion C can be moved integrally with the frame body 20 and the checkered steel plate 21. In other words, the entire floor heater section 2 can be replaced, and even if the floor heater 22 breaks down or the frame body 20 becomes distorted, simply replacing the floor heater section 2 can result in a floor heater device 1 that operates normally.

[0066] The above-described configuration of the floor heater device 1 according to this embodiment allows easy fixing and releasing within the recessed portion C. Because the floor heater device 1 is configured to be fixed and released within the recessed portion C by fixing and releasing the fixing means 40 in this manner, when the floor heater 22 breaks down, the floor heater section 2 including the floor heater 22 can be easily replaced, and the replacement work is easier than the floor heater replacement work in conventional floor heater devices, allowing repair work on the floor heater device 1 to be carried out quickly.

[0067] Second Embodiment The overall configuration of a floor heater device 1A according to a second embodiment of the present invention will be described with reference to Figs. 9 to 12. Fig. 9 is an exploded perspective view showing the configuration of the floor heater device 1A. Fig. 10 is a view showing the configuration of a frame body 20A. Fig. 11 is a schematic cross-sectional view showing the state in which the floor heater device 1A is installed in the recess C. Fig. 12 is an enlarged view of the part surrounded by the two-dot chain line in Fig. 11. The floor heater device 1A according to the second embodiment will be described below with reference to the drawings.

[0068] In the floor heater device 1A in the second embodiment, the configurations of the frame body 20A and the horizontal adjustment unit 3A are different from those of the frame body 20 and the horizontal adjustment unit 3 in the first embodiment. However, the only change from the frame body 20 to the frame body 20A is that the integration hole 203f provided in the frame body 20 is changed to a fixing hole 203g as shown in Fig. 10, so a detailed description of the frame body 20A will be omitted. Below, the horizontal adjustment unit 3A will be described in detail, and a description of the same configuration as the floor heater device 1 in the first embodiment will be omitted.

[0069] As shown in FIG. 9, the horizontal adjustment section 3A has a horizontal adjustment plate 30A and a swing restriction body 30B placed on the horizontal adjustment plate 30A.

[0070] The horizontal adjustment plate 30A is formed in a substantially rectangular shape in a plan view, and is a flat plate with a plate thickness direction in the up-down direction. The horizontal adjustment plate 30A is a metal plate body, and its outer shape is formed to be larger than that of the frame body 20A. In other words, the outer periphery of the horizontal adjustment plate 30A is formed to be larger than that of the frame body 20A in a plan view.

[0071] The horizontal adjustment plate 30A also has a plurality of horizontal adjustment holes 301A. A level adjustment bolt is screwed into the horizontal adjustment hole 301A to make the upper surface of the horizontal adjustment plate 30A parallel to the floor surface FL. Therefore, by adjusting the length of the level adjustment bolt protruding downward from the lower surface of the horizontal adjustment plate 30A, the upper surface of the horizontal adjustment plate 30A can be made approximately parallel to the floor surface FL without being affected by the uneven shape of the bottom surface of the recess C.

[0072] The swing restriction body 30B has a fixed portion 301B that is placed and fixed on the horizontal adjustment plate 30A, and a swing restriction portion 302B that is bent at a right angle upward from the inner end of the fixed portion 301B and stands vertically.

[0073] The fixed portion 301B is formed in a substantially rectangular plate shape in a plan view, and has a substantially rectangular opening 303B in the center. The thickness of the fixed portion 301B is in the vertical direction, and the thickness is formed to be substantially the same as that of the horizontal adjustment plate 30A, and the outer shape is formed to be substantially the same. The opening 303B is formed to be slightly larger than the outer shape of the frame body 20A, and is formed to be a size that allows the frame body 20A to be stored within the opening 303B. In addition, the swing restriction body 30B has a swing restriction portion 302B standing along the opening 303B.

[0074] The swing regulating portion 302B is formed in a substantially plate-like shape with substantially the same thickness as the fixed portion 301B, and is provided along the opening 303B. The swing regulating portion 302B is formed in a flat plate-like shape, and its height is substantially the same as that of the frame body 20A placed on the upper surface of the horizontal adjustment plate 30A. In other words, the upper end of the swing regulating body 302B is formed at substantially the same height as the upper end of the side wall of the recessed portion C. In other words, when the horizontal adjustment portion 3A is placed on the bottom surface of the recessed portion C, the upper end of the swing regulating portion 302B is set at a height that is substantially flush with the floor surface FL.

[0075] By configuring the horizontal adjustment unit 3A in this way, the horizontal adjustment unit 3A is placed in the recessed portion C, the top surface of the horizontal adjustment plate 30A is adjusted with a level adjustment bolt so that it is parallel to the floor surface FL, and patching mortar is poured between the swing restriction unit 302B and the side wall of the recessed portion C, thereby forming a swing restriction space CS having a bottom surface parallel to the floor surface FL (see Figs. 11 and 12). In other words, the swing restriction space CS is surrounded by the horizontal adjustment plate 30A and the swing restriction unit 302B and is formed in a box shape with an open top. Then, the floor heater unit 2A is stored in this swing restriction space CS, and the installation work of the floor heater device 1 in the recessed portion C is completed.

[0076] Furthermore, by configuring the floor heater unit 2A and the horizontal adjustment unit 3A to be installed independently within the recess C, in the event of a malfunction of the floor heater device 1, the replacement work of the floor heater device 1 can be completed simply by removing the floor heater unit 2A from the sway regulation space CS and storing the normally operating floor heater unit 2A in the sway regulation space CS, and the malfunction of the floor heater device 1 can be quickly resolved.

[0077] In addition, by configuring the rocking restriction body 30B to be approximately L-shaped in vertical cross section and pouring patching mortar between the outer circumferential surface of the rocking restriction body 302B and the side wall of the recess C to fix the horizontal adjustment part 3A inside the recess C, it is possible to restrict the movement of the horizontal adjustment part 3A during the replacement work of the floor heater part 2A. In other words, the replacement work of the floor heater part 2A can be performed without moving the horizontal adjustment part 3A.

[0078] <Installation Procedure> 13(a) to (c), a procedure for installing the floor heater device 1A of the second embodiment in the recess C will be described. In the second embodiment, the floor heater unit 2A is manufactured in a factory or the like, so a description of the procedure for installing the floor heater unit 2A will be omitted.

[0079] As shown in Fig. 13(a), the floor surface FL is chipped, the floor heater embedded in the floor surface FL is removed, and a recess C for placing the floor heater device 1A is formed at the entrance SE of the refrigerated / freezer warehouse S. Then, the horizontal adjustment unit 3A is laid on the bottom surface of the recess C formed in the floor surface FL. At this time, the horizontal adjustment plate 30A of the horizontal adjustment unit 3A is adjusted so that the upper surface is horizontal by the level adjustment bolt screwed into the horizontal adjustment hole 301A.

[0080] 13(b), quick-drying patching mortar is poured between the outer peripheral surface of the swing regulation portion 302B of the swing regulation body 30B formed integrally with the level adjustment plate 30A and the side wall of the recess C. As a result, the patching mortar is formed on the upper surface of the fixed portion 301B while filling the small gap formed between the swing regulation portion 302B and the recess C with the patching mortar, and the level adjustment portion 3A is fixed to the bottom surface of the recess C.

[0081] As shown in Figure 13(c), a floor heater section 2A, which is formed integrally in a factory or the like from a frame body 20, a checkered steel plate 21, a floor heater 22, a first insulating material 23, a supporting steel plate 24, and a second insulating material 25, is housed in a swing-control space CS formed by a horizontal adjustment part 3A fixed within a recess C.

[0082] As described above, the floor heater device 1A according to the second embodiment is installed in the recessed portion C in the procedure shown in Fig. 13(a) to (c). Since the floor heater unit 2A and the horizontal adjustment unit 3A of the floor heater device 1A are configured independently of each other, the floor heater unit 2A can be easily removed from within the recessed portion C.

[0083] Furthermore, in the floor heater device 1, the floor heater section 2 including the frame body 20 and the checkered steel plate 21 are integrally formed, so that the floor heater 22, the first insulating material 23, the supporting steel plate 24, and the second insulating material 25 provided in the storage space CS of the recessed portion C can be moved integrally with the frame body 20 and the checkered steel plate 21. In other words, the entire floor heater section 2 can be replaced, and even if the floor heater 22 breaks down or the frame body 20 becomes distorted, simply replacing the floor heater section 2 can result in a floor heater device 1A that operates normally.

[0084] The floor heater device 1A according to the second embodiment has the above-mentioned configuration, which allows easy installation and removal of the floor heater unit 2A within the recessed portion C. In this way, the floor heater device 1A separates the floor heater unit 2A from the horizontal adjustment unit 3A, and is configured so that the horizontal adjustment unit 3A cannot be easily removed from the recessed portion C while maintaining a horizontal state within the recessed portion C, allowing easy installation and removal of the floor heater unit 2A. This makes the work easier than replacing the floor heater in a floor heater device, and allows repair work on the floor heater device 1A to be carried out quickly.

[0085] Although one embodiment of the present invention has been described, the above description is merely an example of the present invention, and the present invention is not limited to the above-described embodiment. Therefore, even if the embodiment is different from the above-described embodiment, various modifications can be made depending on the design, etc., as long as they do not deviate from the technical concept of the present invention. [Explanation of symbols]

[0086] 1,1A Floor heater unit 2,2A Floor heater section 3,3A horizontal adjustment section 20,20A frame 21 Checkered steel plate 22 Floor heater 23 First Insulation Material 24 Support steel plate 25 Secondary Insulation 30,30A horizontal adjustment plate 30B Swing Regulator 31 Fixing hole 32 Adjustment hole 40 Fixing means 201 Frame 202 Support part 203 Wall 204 Storage space 205 Checkered steel support 206 Support steel plate support 207 Heating space 210 Hole 241 Hole 301A Horizontal adjustment hole 301B Fixed part 302B Swing control part 303B opening C recess CS Swing Control Space F Forklift FL floor surface K Cinder Concrete L wiring P Connection space C1 Bottom FL floor surface S cold storage SE entrance

Claims

1. A floor heater device that is provided on a floor surface at an entrance of a refrigerated warehouse for storing cargo that is to be kept at low temperature, A floor heater unit is removably stored in the recess of the floor surface, The floor heater unit includes: A frame body to be housed in the recess; A checkered steel plate that is detachably placed on the frame body and closes the upper surface of the recess; A floor heater provided below the checkered steel plate; A first insulating material provided below the floor heater; A supporting steel plate provided below the first insulating material; A second insulating material provided below the supporting steel plate; Equipped with The floor heater unit is housed in the frame while forming multiple layers from top to bottom in the order of the floor heater, the first insulating material, the supporting steel plate, and the second insulating material, A floor heater device characterized in that the frame is formed integrally with the checkered steel plate by a fixing means in a manner that houses the floor heater, the first insulation material, the supporting steel plate, and the second insulation material.

2. 2. The floor heater device according to claim 1, The floor heater unit is further provided with a horizontal adjustment unit that horizontally supports the floor heater unit when the floor heater unit is stored in the recess, The frame body is A frame portion provided along a side wall that forms the recess; A support portion is installed on a surface of the frame portion facing the storage space surrounded by the frame portion; having The horizontal adjustment unit is a horizontal adjustment plate that is placed on a bottom surface of the recess and that adjusts the frame body to a horizontal state; A floor heater device characterized in that the bottom surfaces of the frame portion and the support portion are supported by the level adjustment plate.

3. 3. The floor heater device according to claim 2, wherein the checkered steel plate and the frame are fixed to the level adjustment plate by the fixing means.

4. 2. The floor heater device according to claim 1, The floor heater unit is further provided with a horizontal adjustment unit that horizontally supports the floor heater unit when the floor heater unit is stored in the recess, The horizontal adjustment unit is a level adjustment plate on a bottom surface of the recess for making the frame body horizontal; a swing restriction body that is placed on the horizontal adjustment plate and is interposed between the frame body and a side wall of the recess, A floor heater device, characterized in that the horizontal adjustment plate and the oscillation regulating body are integrally formed.

Images