Heat gun

Abstract

This heat gun provides a heat gun in which heat from the heating element is less likely to be transferred to the outermost layer of the cover. [Solution] The heat gun comprises a fan, a heating element, a heater housing, an inner cover, and an outer cover. The heater housing, which houses the heating element, comprises (i) a cylindrical body extending along the long axis that defines the front-to-back direction of the heat gun, (ii) a flow path defined inside the body for passing air, and (iii) an outlet hole provided at the front end of the body for sending the air flow passing through the flow path to the outside. The inner cover is positioned radially outward from the heater housing perpendicular to the long axis and covers at least a portion of the heater housing. The outer cover is positioned radially outward from the inner cover and covers at least a portion of the inner cover at a distance from it. At least one through hole is defined between the outer cover and the inner cover.

Description

Technical Field

[0001] The present disclosure relates to a heat gun.

Background Art

[0002] There is known a heat gun that sends out air heated by a heating part from a delivery hole. For example, Patent Document 1 discloses a heat gun including a heater housing that houses a heating part and a cover part that houses the heater housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When using a heat gun, the cover part may be heated by heat transfer from the heating part or the like. If the outermost layer of the cover part is excessively heated, the material and shape of the outermost layer of the cover part may change, making it difficult for the user to grip the cover part. Therefore, a heat gun in which heat from the heating part is difficult to be transferred to the outermost layer of the cover part is desired.

Means for Solving the Problems

[0005] The present disclosure can be realized in the following forms.

[0006] One non-limiting aspect of the present disclosure provides a heat gun for heating and discharging air. The heat gun comprises a fan, a heating element, a heater housing, an inner cover, and an outer cover. The fan rotates by the drive of a motor to generate airflow. The heating element generates heat when energized. The heater housing houses the heating element. The heater housing comprises (i) a cylindrical body extending along a longitudinal axis defining the front-to-back direction of the heat gun, (ii) a flow path defined inside the body for the airflow to pass through, and (iii) a discharge hole provided at the front end of the body for discharging the airflow passing through the flow path to the outside. The inner cover is positioned radially outward of the heater housing perpendicular to the longitudinal axis and covers at least a portion of the heater housing. The outer cover is positioned radially outward of the inner cover and covers at least a portion of the inner cover at a distance from the inner cover. At least one through hole is provided between the outer cover portion and the inner cover portion.

[0007] According to the heat gun of the above embodiment, an air layer is formed between the outer cover and the inner cover, thereby suppressing or preventing heat transfer from the inner cover to the outer cover. Therefore, heat from the heat-generating part is less likely to be transmitted to the outer cover, and changes in the material and shape of the outer cover can be suppressed or prevented. [Brief explanation of the drawing]

[0008] [Figure 1] A perspective view showing the external configuration of a heat gun according to the first embodiment. [Figure 2] A cross-sectional view of the II-II position shown in Figure 1. [Figure 3] Figure 2 is an explanatory diagram showing a magnified view of the air blower, heat heating element, and removal mechanism. [Figure 4] A perspective view showing the external configuration of the heat-generating section. [Figure 5] A perspective view showing the external configuration of the removal mechanism. [Figure 6] A cross-sectional view showing the removal mechanism in operation. [Figure 7] Front view showing the removal mechanism. [Figure 8] A front view showing the positional relationship between the through-hole of the removal mechanism and the main housing. [Figure 9] A cross-sectional view showing the IX-IX position in Figure 7. [Figure 10] A cross-sectional view showing the XX position in Figure 3. [Figure 11] The first explanatory diagram shows a modified example of the connection part. [Figure 12] A second explanatory diagram showing a modified example of the connection part. [Figure 13] A third explanatory diagram showing a modified example of the connection part. [Modes for carrying out the invention]

[0009] A. First Embodiment: Representative and non-limiting examples of the present invention will be described in detail below with reference to the drawings. This detailed description is intended simply to show those skilled in the art details for carrying out preferred examples of the present invention and is not intended to limit the scope of the invention. In addition, the additional features and inventions disclosed below may be used separately from or in conjunction with the other features and inventions to provide further improved apparatus, methods for manufacturing and using the same.

[0010] Furthermore, the combinations of features and processes disclosed in the following detailed description are not essential for carrying out the present invention in the broadest sense, and are described solely to illustrate representative examples of the present invention. Moreover, the various features of the representative examples described above and below, as well as the various features described in the independent and dependent claims, do not necessarily have to be combined in the same way as the examples described herein or in the order listed, in order to provide additional and useful embodiments of the present invention.

[0011] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations to the initial disclosure and the claimed subject matter, apart from the configuration of the features described in the embodiments and / or the claims. Further, all descriptions of numerical ranges and groups or collections are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the claimed subject matter.

[0012] In a non-limiting embodiment of the present disclosure, the heat gun may further include a grip portion extending in a direction intersecting the longitudinal axis direction. When the direction in which the grip portion extends defines the vertical direction of the heat gun, the outer cover portion may overlap more than half of the region of the heating portion when the heat gun is viewed from above. According to this embodiment, the user can suitably grip the outer cover portion, and the workability of the heat gun can be improved.

[0013] In addition to or in place of the above embodiment, the heat gun may further include at least one connecting portion that connects the outer surface of the inner cover portion and the inner surface of the outer cover portion and defines the at least one through hole together with the outer cover portion and the inner cover portion. According to this embodiment, with a simple configuration of forming the connecting portion, the outer cover portion can be arranged radially outward in a state separated from the inner cover portion.

[0014] In addition to or in place of the above embodiment, the heat gun may further include a main body housing that houses the fan. The outer cover portion may be arranged separated from the inner cover portion and the main body housing. According to this embodiment, heat transfer from the outer cover portion to the main body housing can be suppressed or prevented.

[0015] END]]In addition to or instead of the above-described embodiment, the heat gun may further include a grip portion extending in a direction intersecting the longitudinal axis direction. The direction in which the grip portion extends may define the vertical direction of the heat gun. The at least one through hole may be defined to include at least either a first through hole disposed directly above the center of the heater housing when the heat gun is viewed from the front side and a second through hole disposed directly below the center. According to this embodiment, the connection portion is not disposed at least either directly above or directly below the center of the heater housing. Therefore, when the heat gun is used with the grip portion in a posture along the vertical direction, heat rising from the heat generating portion can be suppressed or prevented from being transferred vertically through the connection portion.

[0016] In addition to or instead of the above-described embodiment, the heat gun may further include a grip portion extending in a direction intersecting the longitudinal axis direction. The direction in which the grip portion extends defines the vertical direction of the heat gun, and the direction orthogonal to the front-rear direction and the vertical direction may define the left-right direction of the heat gun. The at least one through hole may be defined to include at least either a third through hole disposed to the right of the center of the heater housing when the heat gun is viewed from the front side and a fourth through hole disposed to the left of the center. According to this embodiment, the connection portion is not disposed at least either to the left or right of the center of the heater housing. Therefore, when the heat gun is used with the grip portion in a posture along a direction orthogonal to the vertical direction, heat rising from the heat generating portion can be suppressed or prevented from being transferred vertically through the connection portion.

[0017] In addition to or instead of the above-described embodiment, the heat gun may further include a main body housing that houses the fan. When the heat gun is viewed from the front side, the at least one through hole may be disposed to include a region that does not overlap with the main body housing. According to this embodiment, air can pass through the through-holes more easily, improving the air cooling effect on the outer cover and inner cover through the through-holes.

[0018] In addition to or in lieu of the above embodiments, the length of the outer cover portion in the front-to-back direction may be shorter than the length of the inner cover portion in the front-to-back direction. According to this embodiment, the air cooling effect of the inner cover can be improved by having a portion of the inner cover that is exposed to the outside without being covered by the outer cover.

[0019] In addition to, or in lieu of, the above embodiment, the front end of the outer cover portion may be positioned rearward from the front end of the inner cover portion. According to this embodiment, compared to the case where the front end of the inner cover and the front end of the outer cover are flush, the area near the heat gun's discharge hole is reduced in diameter. This makes it less likely for the area near the heat gun's discharge hole to come into contact with the object being heated, thereby improving workability near the object being heated by the heat gun.

[0020] In addition to or in lieu of the above embodiments, the outer cover portion may be provided with a projection that protrudes radially outward from the outer surface of the outer cover portion. According to this embodiment, the protruding portion functions as an anti-slip feature, making it possible to provide a heat gun that is easy to grip the outer cover portion of.

[0021] In addition to, or in lieu of, the above embodiment, the heat gun may further include an extrusion unit positioned between the heater housing and the inner cover portion and connected to the inner cover portion. The outer cover portion and the inner cover portion are integrally movable forward. The extrusion unit may move forward together with the inner cover portion when the outer cover portion is moved forward, thereby pushing forward the nozzle attachment attached to the front end of the heater housing. According to this embodiment, the nozzle attachment mounted on the heater housing can be easily removed by utilizing the outer cover portion and the inner cover portion.

[0022] In addition to or instead of the above embodiments, the maximum length in the front-to-back direction of the heat gun may be 160 mm or more and 200 mm or less. According to this embodiment, a heat gun that is easy for the user to carry can be provided.

[0023] In addition to or instead of the above embodiment, the distance from the outer surface of the inner cover portion to the inner surface of the outer cover portion may be 5 mm or more. According to this embodiment, the thickness of the air layer between the inner cover and the outer cover can be ensured, and heat transfer from the inner cover to the outer cover can be effectively suppressed or prevented.

[0024] In addition to or in lieu of the above embodiments, the ratio of the width of the outer surface contour of the outer cover portion in the radial direction to the width of the outer surface contour of the inner cover portion in the radial direction may be 125% or more. According to this embodiment, by separating the outer surface of the outer cover from the outer surface of the inner cover, heat transfer from the inner cover to the outer surface of the outer cover can be effectively suppressed or prevented.

[0025] In addition to, or in place of, the above embodiment, the heat gun may further include a battery mounting section for electrically connecting a battery that supplies power to the heating element. The maximum temperature at the front end of the heater housing when the heat gun is powered by the battery may be 600°C or higher. According to this embodiment, it is possible to provide a heat gun that is highly portable and blows out a higher temperature airflow than conventional models.

[0026] A. First Embodiment: A1. Heat Gun 100 Configuration: The configuration of the heat gun 100 according to the first embodiment of this disclosure will be described with reference to Figures 1 to 4. As shown in Figure 1, the heat gun 100 is an electric tool for heat treatment that discharges heated air from an outlet 66. The heat gun 100 can be used for various applications such as bending resin products, peeling paint and adhesive seals, deforming resin tubes by heating, drying materials, and rust prevention.

[0027] As shown in Figure 1, the outer casing of the heat gun 100 is formed by a main housing 10 and a removal mechanism 50. The removal mechanism 50 is attached to the end of the main housing 10. The heater housing 60 is housed in the removal mechanism 50. The heater housing 60 has a long, roughly cylindrical shape. The direction of the long axis of the heater housing 60 defines the direction of air discharge from the heat gun 100.

[0028] The main housing 10 includes a handle housing 12 and a blower housing 14. The blower housing 14 has a substantially cylindrical shape that is elongated in a direction parallel to the long axis direction of the heater housing 60. The handle housing 12 extends from approximately the center of the blower housing 14 in the direction of the long axis direction in a direction intersecting the said long axis direction (in this embodiment, a direction roughly perpendicular to the long axis direction). The removal mechanism 50 is attached to the end of the blower housing 14.

[0029] In this specification, with respect to the orientation of the heat gun 100, the direction of the long axis of the heater housing 60 is defined as the front-to-back direction of the heat gun 100. Of the front-to-back direction, the side where the discharge hole 66 is located is defined as the front side, and the side where the intake hole 142 is located is defined as the rear side. As shown in Figure 2, the heat gun 100 according to this embodiment has a maximum length L1 in the front-to-back direction of approximately 190 mm, making it a handy type that is easy for the user to carry. In addition, the maximum length L1 is preferably 160 mm or more and 200 mm or less from the viewpoint of improving portability. For this reason, the heat gun 100 according to this embodiment is sometimes called a portable heat treatment tool.

[0030] In this specification, the direction perpendicular to the longitudinal axis and corresponding to the extension direction of the handle housing 12 is defined as the vertical direction. Within the vertical direction, the side where the air blower housing 14 is located is defined as the upper side, and the protruding end (free end) side of the handle housing 12 is defined as the lower side. Furthermore, the direction perpendicular to the front-rear and vertical directions is defined as the left-right direction. The direction perpendicular to the longitudinal axis is defined as the radial direction. The radial direction means the radial direction centered on the longitudinal axis.

[0031] As shown in Figures 1 and 2, the blower housing 14 is connected to the upper side of the handle housing 12. The blower housing 14 has a substantially cylindrical shape that extends in the front-rear direction. The blower housing 14 includes an intake port 142 for drawing in outside air, an opening 144, and an operating section 18.

[0032] The intake port 142 is formed at the rear of the blower housing 14. The intake port 142 is an opening that connects the inside and outside of the blower housing 14. The opening 144 is formed at the front end of the blower housing 14.

[0033] The blower housing 14 houses the blower unit 30 that generates airflow. A heater housing 60 is positioned in front of the blower unit 30. The rear of the heater housing 60 is housed in the blower housing 14, while the front of the heater housing 60 protrudes forward from the opening 144 and is exposed from the blower housing 14. The heater housing 60 houses a heat-generating unit 70. The heat-generating unit 70 heats the airflow supplied from the blower unit 30.

[0034] A removal mechanism 50 is attached to the opening 144 at the front end of the blower housing 14. The removal mechanism 50 is located radially outward from the heating element 70 and the heater housing 60 and also functions as a cover that surrounds the heating element 70 and the heater housing 60.

[0035] As shown in Figures 1 and 2, the handle housing 12 includes a gripping portion 20, a switch 24, a trigger 26, and a controller 80. The trigger 26 is located on the front side of the gripping portion 20. The trigger 26 is configured to accept a pressing operation (pulling operation) by the user and a release operation to release the pressing operation.

[0036] The switch 24 is housed inside the handle housing 12 behind the trigger 26. The switch 24 is connected to the controller 80. The switch 24 switches between an ON state and an OFF state in response to the pressing operation of the trigger 26. In this embodiment, the heat gun 100 is equipped with a lock-on button 28 that has the function of keeping the heat gun 100 in the ON state.

[0037] As shown in Figure 2, the gripping portion 20 has a substantially cylindrical shape that extends in a direction perpendicular to the long axis. The gripping portion 20 is part of the handle housing 12 and is configured to be gripped by the user. The handle housing 12 is integrally formed with the air blower housing 14. That is, the handle housing 12 and the air blower housing 14 form an integrated main body housing 10. The main body housing 10 can be formed, for example, from a resin material and by fastening a pair of left and right halves of the housing together.

[0038] As shown in Figure 2, a battery mounting section 40 is provided at the protruding end of the handle housing 12. The battery mounting section 40 is configured to allow the attachment and detachment of a rechargeable battery BT. In Figure 2, only the outer shape of the battery BT is shown by a dashed line for ease of understanding the technology. The battery BT is a rechargeable power source, and is a well-known battery pack or secondary battery, such as a lithium-ion battery containing multiple cells. The voltage of the battery BT is, for example, rated at 36V, and the capacity of the battery BT is approximately 4.0Ah to 5.0Ah.

[0039] The battery mounting section 40 includes a terminal 42 and a concave guide groove 44. The guide groove 44 is configured to fit into a rail formed on the battery BT and defines the direction in which the battery BT is attached and detached. The terminal 46 is connected to a power terminal formed on the battery BT. The terminal 46 is electrically connected to the controller 80, motor 32, and heating section 70, etc., via wires etc. arranged inside the main housing 10. The heat gun 100 may also be equipped with a power cord for supplying power from an external AC power source instead of the battery mounting section 40.

[0040] As shown in Figure 1, in this embodiment, the lower end of the handle housing 12, where the battery mounting portion 40 is formed, is formed such that its front-to-back and left-to-right widths are greater than the outer diameter of the grip portion 20. The right side portion 40R of the lower end of the handle housing 12 is configured to be substantially flush with the right side portion 14R of the blower housing 14. When the heat gun 100 is placed on a horizontal plane in a position where the right side portion 14R and the right side portion 40R are positioned vertically downward (hereinafter also referred to as the "first position"), the long axis direction of the heater housing 60 is substantially parallel to the horizontal plane.

[0041] The left side portion 40L of the lower end of the handle housing 12 is configured to be substantially flush with the left side portion 14L of the blower housing 14. When the heat gun 100 is placed on a horizontal plane in a position where the left side portion 14L and the left side portion 40L are positioned vertically downward (hereinafter also referred to as the "second position"), the long axis direction of the heater housing 60 is substantially parallel to the horizontal plane.

[0042] In the heat gun 100 of this embodiment, the rear portion 40B of the lower end of the handle housing 12 is further configured to be substantially flush with the rear portion 14B of the blower housing 14. When the heat gun 100 is placed on a horizontal plane in a position where the rear portion 14B and the rear portion 40B are positioned vertically downward (hereinafter also referred to as the "third position"), the long axis direction of the heater housing 60 is substantially perpendicular to the horizontal plane.

[0043] The controller 80 is housed at the lower end of the handle housing 12. In this embodiment, the controller 80 is housed directly above the battery mounting section 40. The controller 80 consists of a CPU as a processor, memory including ROM and RAM, and a computer including a timer. The controller 80 supplies power from the battery BT to the blower section 30 and the heating section 70. The controller 80 receives control signals from the switch 24 and the operating section 18, and supplies power to the blower section 30 and the heating element 76 according to the received signals.

[0044] The control unit 18 is located on the top of the blower housing 14. The control unit 18 is a group of switches that can adjust the temperature and airflow volume of the air supplied from the heat gun 100. By operating the switches on the control unit 18, the user can adjust, for example, the strength of the airflow and the temperature. The maximum airflow volume of the heat gun 100 in this embodiment can be adjusted up to, for example, 200 L / min, which is greater than the 100 L / min shown as an example of the maximum airflow volume of conventional products. The maximum temperature of the heat gun 100 in this embodiment can be adjusted to 600°C or higher, which is higher than the 550°C shown as an example of the maximum temperature of conventional products. The airflow volume and temperature set by the control unit 18 are output to the controller 80.

[0045] As shown in Figures 2 and 3, the heat gun 100 according to this embodiment includes an air blower 30, a heating element 70, a heater housing 60 that houses the heating element 70, and a removal mechanism 50.

[0046] The blower unit 30 includes a motor 32, a fan 34, and an inner housing 36. The motor 32 is, for example, a brushless DC motor. As shown in Figure 3, the motor 32 is housed approximately in the center of the blower housing 14. Power is supplied to the motor 32 from the battery BT via the controller 80.

[0047] The motor 32 includes a motor body 320, which includes a stator and rotor, and a motor shaft 322. In this embodiment, the rotation axis RX of the motor shaft 322 is configured to be substantially parallel to the long axis direction of the heater housing 60. That is, the rotation axis RX of the motor shaft 322 extends in the front-rear direction. A fan 34 is fixed to the tip of the motor shaft 322. The rotation axis of the motor shaft 322 may intersect or perpendicular to the long axis direction of the heater housing 60.

[0048] Fan 34 is, for example, a centrifugal fan and rotates due to the rotational drive of motor 32. Fan 34 generates airflow by rotating integrally with motor shaft 322.

[0049] The inner housing 36 is fixed inside the blower housing 14 and houses the motor 32 and the fan 34. The inner housing 36 has a roughly cylindrical shape that is elongated in the front-to-back direction. An opening is formed at the front end 36F of the inner housing 36. The opening at the front end 36F of the inner housing 36 communicates with the opening at the rear end of the heater housing 60. The inner surface of the inner housing 36 defines a flow path 38 that directs the airflow generated by the fan 34 into the heater housing 60.

[0050] As shown in Figure 3, the heater housing 60 is connected to the front of the blower unit 30. The heater housing 60 includes a main body 62, a flow path 64, and an outlet hole 66.

[0051] The main body 62 forms the outer casing of the heater housing 60. The main body 62 has a cylindrical shape (a cylindrical shape in this embodiment) that extends in the front-rear direction. The main body 62 includes a steel pipe 622 and a mica tube 624. The mica tube 624 is positioned between the heating element 70 and the steel pipe 622 and suppresses or prevents heat transfer from the heating element 70 to the steel pipe 622.

[0052] The inner surface of the main body 62 defines a passage 64 that allows airflow to pass forward within the heater housing 60. The opening at the rear end of the main body 62 communicates with the opening at the front end 36F of the inner housing 36 and receives airflow from the passage 38 of the blower unit 30. The opening at the front end 60F of the main body 62 communicates the passage 64 with the outside and functions as a discharge hole 66 that sends the airflow from the passage 64 to the outside. The heating element 70 is located in the passage 64.

[0053] As shown in Figure 4, the heating section 70 comprises a support 72 and a heating element 76. The support 72 is a columnar ceramic extending in the longitudinal direction of the heater housing 60. Grooves 74 are formed on the radially outer surface of the support 72. The number of grooves 74 corresponds to the number of heating elements 76. In this embodiment, eight grooves 74 are formed, and a heating element 76 is placed in each of the eight grooves 74. The support 72 stores heat by condensing the heat generated from the heating elements 76.

[0054] The heating element 76 is formed by a heating wire that generates heat when electricity is passed through it. Power is supplied to the heating element 76 from the battery BT via the controller 80. When power is supplied to the heating element 76, it generates heat at a high temperature, for example, 600°C or higher.

[0055] The heating element 76 is formed into a cylindrical shape by spirally winding a heating wire. This cylindrical shape allows airflow to pass more easily through the inside of the heating element 76. Therefore, the flow resistance within the heater housing 60 is reduced, and a decrease in the airflow rate from the discharge hole 66 can be suppressed. Furthermore, the surface area of ​​the heating element 76 in contact with the airflow is increased, allowing for efficient transfer of the heat generated from the heating element 76.

[0056] The air supplied from the blower unit 30 passes through the flow path 64 in the heater housing 60 and is heated to a high temperature by the heating unit 70. The heated air is sent out to the outside toward the front through the discharge hole 66 at the front end 60F of the heater housing 60. The maximum temperature of the airflow sent out from the discharge hole 66 is 600°C or higher. The temperature of the airflow sent out from the discharge hole 66 can be obtained, for example, by measuring the temperature of the discharge hole 66 or a component provided in the discharge hole 66 using various methods such as a thermometer, thermocouple, or temperature sensor when the heat gun 100 is in operation.

[0057] As shown in Figure 2, the outer peripheral surface of the radially outer front end portion 60F of the heater housing 60 is configured to allow the nozzle attachment 90 to be mounted.

[0058] The nozzle attachment 90 is a component that changes the direction of the airflow discharged from the discharge hole 66. The nozzle attachment 90 has various shapes to accommodate applications of heat treatment using the heat gun 100. Figure 2 shows an example of a nozzle attachment 90 with a roughly cylindrical shape in which the front opening is smaller than the rear opening. However, the shape of the nozzle attachment 90 is not limited to this, and it can be appropriately switched to a nozzle attachment 90 suitable for the intended use of the heat gun 100.

[0059] The inner diameter of the opening formed at the rear end of the nozzle attachment 90 is approximately the same as the outer diameter of the front end 60F of the heater housing 60. The nozzle attachment 90 can be attached to the heater housing 60 by, for example, press-fitting. The nozzle attachment 90 can be held to the front end 60F of the heater housing 60 by a frictional force that is not such that it falls off the heater housing 60. In the heat gun 100 according to this embodiment, the nozzle attachment 90 can be removed from the heat gun 100 by a simple method using the removal mechanism 50.

[0060] A2. Airflow path within the heat gun 100: Figure 3 shows the flow path FL of the airflow within the heat gun 100, indicated by a solid arrow. Note that the flow path FL is a conceptual illustration and does not accurately represent the airflow path within the heat gun 100, nor is it limited to the illustrated configuration.

[0061] When the user manually presses the trigger 26, the motor 32 drives the fan 34 to rotate. The rotation of the fan 34 draws outside air through the intake port 142 into the flow path 38 in the inner housing 36. The air drawn in from the outside becomes an airflow and passes through the flow path 38. The airflow flowing through the flow path 38 passes inside and around the motor 32 and is led into the flow path 64 in the main body 62 of the heater housing 60.

[0062] The airflow through the channel 64 is heated as it passes around the heating element 70 located in the channel 64, and is discharged to the outside through a discharge hole 66 formed in the front end 60F of the heater housing 60. If a nozzle attachment 90 is attached to the front end 60F, the airflow is supplied into the nozzle attachment 90 through the discharge hole 66 and discharged to the outside through the opening at the front end of the nozzle attachment 90.

[0063] A3. Configuration of the removal mechanism 50: The configuration of the removal mechanism 50 will be described with reference to Figures 5 through 10, along with Figure 3. As shown in Figure 3, the removal mechanism 50 is held in the opening 144 at the front end of the blower housing 14.

[0064] The removal mechanism 50 is configured to be movable relative to the heater housing 60 in the front-rear direction. Figure 3 shows the removal mechanism 50 in its initial position, where it is positioned at its rearmost end.

[0065] The removal mechanism 50 allows the nozzle attachment 90 to be removed from the heater housing 60 by sliding it forward from its initial position. The removal mechanism 50 is sometimes called a quick-release mechanism because it allows the nozzle attachment 90 to be removed in a simple manner. The removal mechanism 50 is also located radially outside the heating element 70 and the heater housing 60 and functions as a cover that surrounds the heating element 70 and the heater housing 60.

[0066] As shown in Figures 3 and 5, the removal mechanism 50 comprises an inner cover portion 52, an outer cover portion 54, and an extrusion portion 58. The inner cover portion 52 has a cylindrical shape corresponding to the heater housing 60. Specifically, the inner cover portion 52 has a long, substantially cylindrical shape along the long axis of the heater housing 60. As shown in Figure 3, the inner cover portion 52 is positioned radially outward of the heater housing 60 so as to cover at least a portion of the heater housing 60. In the example in Figure 3, the inner cover portion 52 covers the heater housing 60 from near the rear end to near the front end. The inner cover portion 52 is formed using a material with low thermal conductivity, such as a resin material, to suppress or prevent heat generated from the heater housing 60 from being transferred to the outside.

[0067] As shown in Figure 3, an extruded portion 58 is fixed to the inner surface 521 of the inner cover portion 52. The extruded portion 58 is a metal member having a substantially cylindrical shape corresponding to the outer shape of the heater housing 60. The extruded portion 58 is fastened to a protrusion 52P (see Figure 10) formed on the inner surface of the inner cover portion 52 by screws or the like. Therefore, the extruded portion 58 moves integrally with the inner cover portion 52 when the removal mechanism 50 is operated. The extruded portion 58 has an inner diameter slightly larger than the outer shape of the heater housing 60. Therefore, the extruded portion 58 moves back and forth along the outer surface of the heater housing 60.

[0068] As shown in Figure 6, when the removal mechanism 50 is operated to move the inner cover portion 52 forward, the front end 58F of the extrusion portion 58 comes into contact with the rear end of the nozzle attachment 90 mounted on the front end 60F of the heater housing 60. The front end 58F of the extrusion portion 58 pushes the rear end of the nozzle attachment 90 forward relative to the heater housing 60, resisting the frictional force between the nozzle attachment 90 and the heater housing 60. As a result, the nozzle attachment 90 is removed from the heater housing 60.

[0069] As shown in Figure 5, a helical guide groove 528 is formed near the rear end of the outer surface 522 of the inner cover portion 52. The guide groove 528 is slidably screwed into a helical guide projection 148 (see Figure 6) formed near the opening 144 of the blower housing 14.

[0070] When the inner cover portion 52 is rotated counterclockwise when viewed from the front along the front-to-back direction of the heat gun 100, the guide projection 148 slides spirally along the guide groove 528. As a result, the inner cover portion 52 rotates relative to the heater housing 60 and moves forward along the long axis of the heater housing 60. When the inner cover portion 52 is rotated clockwise relative to the heater housing 60, the guide projection 148 slides spirally in the opposite direction along the guide groove 528. As a result, the inner cover portion 52 moves backward along the long axis of the heater housing 60.

[0071] In this embodiment, the front end of the blower housing 14 and the rear end of the inner cover portion 52 are connected by a coil spring (not shown). When the inner cover portion 52 is in its initial position, the coil spring is compressed. When the inner cover portion 52 is moved forward by operating the removal mechanism 50, it moves forward against the biasing force of the coil spring. Therefore, the inner cover portion 52 that is positioned forward of its initial position is subjected to a biasing force by the coil spring that restores it to its initial position. With this configuration, the inner cover portion 52 that has been moved forward by operating the removal mechanism 50 can be easily moved back to its initial position. In addition, since a biasing force that restores it to its initial position is applied, excessive forward movement of the inner cover portion 52 can be suppressed or prevented when using the removal mechanism 50. Thus, it is possible to prevent the inner cover portion 52 from falling off the heater housing 60.

[0072] The outer cover portion 54 is the outermost layer of the removal mechanism 50 and functions as an operating part for operating the removal mechanism 50. Furthermore, when the grip portion 20 of the handle housing 12 is considered the first grip portion, the outer cover portion 54 functions as a second grip portion that can be gripped by the user. Note that if the heat gun 100 does not have a removal mechanism 50, it functions only as the second grip portion.

[0073] As shown in Figures 3 and 5, the outer cover portion 54 has a long, substantially cylindrical shape along the long axis of the heater housing 60. The outer cover portion 54 is positioned radially outward of the inner cover portion 52 so as to cover at least a portion of the inner cover portion 52. In this embodiment, the outer cover portion 54 is a separate and independent component from the main housing 10 and is positioned at a distance from the main housing 10.

[0074] As shown in Figures 3 and 5, the outer cover portion 54 is spaced apart from the inner cover portion 52. A front opening 540F is formed at the front end 54F of the outer cover portion 54, defined by the front end 54F of the outer cover portion 54 and the outer surface 522 of the inner cover portion 52. A rear opening 540B is formed at the rear end 54B of the outer cover portion 54, defined by the rear end 54B of the outer cover portion 54 and the outer surface 522 of the inner cover portion 52.

[0075] A through-hole 53 is defined between the outer cover portion 54 and the inner cover portion 52. The through-hole 53 is a space defined between the outer surface 522 of the inner cover portion 52 and the inner surface 541 of the outer cover portion 54. The through-hole 53 connects the front opening 540F to the rear opening 540B. By forming an air layer between the outer cover portion 54 and the inner cover portion 52, heat transfer from the inner cover portion 52 to the outer cover portion 54 can be suppressed or prevented. In addition, by forming the through-hole 53 between the inner cover portion 52 and the outer cover portion 54, the inner cover portion 52 and the outer cover portion 54 are made more susceptible to air cooling. Therefore, the temperature rise of the inner cover portion 52 and the outer cover portion 54 can be efficiently suppressed or prevented.

[0076] As shown in Figure 7, in this embodiment, the outer cover portion 54 is connected to the inner cover portion 52 via a connecting portion 55. The connecting portion 55 is a member that connects the outer surface 522 of the inner cover portion 52 to the inner surface 541 of the outer cover portion 54. The outer cover portion 54 is held by the inner cover portion 52 by the connecting portion 55 in a state where it is separated from the inner cover portion 52. With this configuration, the outer cover portion 54 and the inner cover portion 52 can be connected with a simple configuration. In addition, the user can suitably operate the removal mechanism 50 by operating the outer cover portion 54, which is less susceptible to heat transfer from the heater housing 60, instead of the inner cover portion 52, which is closer to the heater housing 60.

[0077] As shown in Figures 3 and 5, in this embodiment, the outer cover portion 54 is provided with a projection 56 that protrudes radially outward from the outer surface 522 of the outer cover portion 54. The projection 56 is a portion that is larger in diameter than the other parts of the outer cover portion 54. The projection 56 is formed on the peripheral edge of the outer surface 542 of the outer cover portion 54 near the front end 54F. The projection 56 functions as an anti-slip surface when the user grips the outer cover portion 54. Because the projection 56 functions as an anti-slip surface, the user can easily grip the outer cover portion 54 and operate the removal mechanism 50 favorably.

[0078] As shown in Figure 7, in this embodiment, the connecting portion 55 is a long plate-shaped member along the front-rear direction. The thickness TH1 of the connecting portion 55 is thinner than the radial thickness TH2 of the outer cover portion 54. This configuration allows for efficient suppression or prevention of heat transfer from the inner cover portion 52 to the outer cover portion 54 via the connecting portion 55. Furthermore, the thickness TH1 may be thinner than the radial thickness TH3 of the inner cover portion 52. The thickness TH1 of the connecting portion 55 refers to the so-called circumferential thickness perpendicular to the radial direction. The thickness TH1 may be the maximum value or average value of the thickness of the connecting portion 55. The thicknesses TH2 and TH3 may be the maximum thickness of the outer cover portion 54 or the inner cover portion 52, or average values. In this embodiment, the thickness TH2 does not include the protruding portion 56, but it may include the protruding portion 56.

[0079] As shown in Figure 7, in this embodiment, the outer cover portion 54 and the inner cover portion 52 are connected via four connection portions 55. Figure 7 shows the center CP of the heater housing 60 when the removal mechanism 50 is viewed from the front. The center CP refers to the center of the outer shape of the heater housing 60 in a front view. In this embodiment, the position of the center CP is the position through which the rotation axis RX of the motor shaft 322 and the central axis of the heater housing 60 pass.

[0080] When the removal mechanism 50 is viewed from the front, the four connection parts 55 divide the through hole 53 into four regions: upper, lower, left, and right. Specifically, the four connection parts 55 are divided into a first through hole 53A which includes the region RA directly above the center CP, a second through hole 53B which includes the region RB directly below the center CP, a third through hole 53C which includes the region RC to the right of the center CP, and a fourth through hole 53D which includes the region RD to the left of the center CP.

[0081] Here, when using the heat gun 100 for heating, the heat gun 100 can be used in various positions. When the user grips the gripping part 20 and uses the heat gun 100, it is relatively common to use the heat gun 100 in a position where the gripping part 20 extends vertically, the air blower part 30 and the heating part 70 are positioned vertically above the gripping part 20, and the rotation axis RX of the motor shaft 322 extends approximately horizontally (hereinafter also referred to as the "normal position").

[0082] In the heat gun 100 of this embodiment, a first through-hole 53A is formed in the region RA directly above the heater housing 60, which is the heat source. In other words, the connection portion 55 is positioned to avoid the region RA directly above the heater housing 60. Therefore, when the heat gun 100 is used in its normal position, it is possible to suppress or prevent heat transfer from the heater housing 60 and the inner cover portion 52 to the connection portion 55. Consequently, the temperature rise of the outer cover portion 54 can be suppressed or prevented more efficiently.

[0083] When performing heating treatment at a low position, the user may use the heat gun 100 in an inverted position relative to its normal orientation (hereinafter also referred to as the "inverted position"). Specifically, the inverted position is one in which the gripping portion 20 extends vertically, the blower portion 30 and the heating portion 70 are positioned vertically below the gripping portion 20, and the rotation axis RX of the motor shaft 322 extends approximately horizontally.

[0084] In the heat gun 100 of this embodiment, a second through-hole 53B is formed in the region RB directly below the heater housing 60. Therefore, when the heat gun 100 is used in an inverted position, the transfer of heat rising from the heater housing 60 and the inner cover portion 52 to the outer cover portion 54 via the connection portion 55 can be suppressed or prevented more efficiently.

[0085] In the heat gun 100 of this embodiment, a third through-hole 53C is further formed in the right region RC of the heater housing 60. Therefore, when the heat gun 100 is used in the second position, the transfer of heat rising from the heater housing 60 and the inner cover portion 52 to the outer cover portion 54 via the connection portion 55 can be suppressed or prevented more efficiently.

[0086] In the heat gun 100 of this embodiment, a fourth through-hole 53D is further formed in the left region RD of the heater housing 60. Therefore, when the heat gun 100 is used in the first position, the transfer of heat rising from the heater housing 60 and the inner cover portion 52 to the outer cover portion 54 via the connection portion 55 can be suppressed or prevented more efficiently.

[0087] The through-holes 53 are positioned so as not to overlap with the main housing 10 in the front-to-back direction. In Figure 8, when the heat gun 100 is viewed from the front, the regions R1, R2, R3, and R4 in which the through-holes 53 and the main housing 10 do not overlap are shown using hatching. That is, the regions R1, R2, R3, and R4 shown in Figure 8 are regions in which no objects exist in the front-to-back direction. In this embodiment, the through-holes 53B, 53C, and 53D other than the first through-hole 53A are positioned to include the regions R1, R2, R3, and R4 in which they do not overlap with the main housing 10. By preventing the rear opening 540B of the through-holes 53 from being blocked by the main housing 10 or the like, air can pass through the through-holes 53 more easily. The air cooling effect on the outer cover portion 54 and the inner cover portion 52 by the through-holes 53 can be improved.

[0088] Figure 9 shows the distance CL from the outer surface 522 of the inner cover portion 52 to the inner surface 541 of the outer cover portion 54. Distance CL is the height of the through hole 53 in the radial direction and is also the length of the connecting portion 55 in the radial direction. Distance CL can also be said to be the separation distance from the inner cover portion 52 to the outer cover portion 54. In this embodiment, distance CL is 5 mm or more. By setting distance CL to 5 mm or more, the thickness of the air layer between the inner cover portion 52 and the outer cover portion 54 can be ensured. Therefore, heat transfer from the inner cover portion 52 to the outer cover portion 54 can be effectively suppressed or prevented.

[0089] The distance CL can be calculated using the formula CL = (W2 - W1) * (1 / 2), where W2 is the maximum width of the contour of the inner surface 541 of the outer cover portion 54, and W1 is the maximum width of the contour of the outer surface 522 of the inner cover portion 52. In this embodiment, both the inner cover portion 52 and the outer cover portion 54 are substantially cylindrical in shape. Therefore, the maximum width of the contour of the inner surface 541 of the outer cover portion 54 is the maximum value of the inner diameter of the outer cover portion 54, and the maximum width of the contour of the outer surface 522 of the inner cover portion 52 is the maximum value of the outer diameter of the inner cover portion 52.

[0090] Furthermore, in this embodiment, when the maximum width of the contour of the outer surface 542 of the outer cover portion 54 is defined as width W3, the ratio of width W3 to width W1 is 125% or more. The maximum width of the contour of the outer surface 522 of the outer cover portion 54 is the maximum value of the outer diameter of the outer cover portion 54. By sufficiently separating the outer surface 542 of the outer cover portion 54 from the outer surface 522 of the inner cover portion 52, heat transfer from the inner cover portion 52 to the outer surface of the outer cover portion 54 can be effectively suppressed or prevented. Note that widths W1, W2, and W3 may be the minimum width or the average value of the widths, rather than the maximum width. In this embodiment, the protrusion 56 is not included in width W3, but it may be included.

[0091] The front end 54F of the outer cover portion 54 is positioned rearward from the front end 52F of the inner cover portion 52. Therefore, the straight line SL connecting the front end 52F of the inner cover portion 52 and the front end 54F of the outer cover portion 54 is inclined with respect to the front-rear direction. In other words, the outer shape of the removal mechanism 50 is configured to be reduced in diameter towards the front. With this configuration, the area near the discharge hole 66 of the heat gun 100 is reduced in diameter compared to the case where the front end 52F of the inner cover portion 52 and the front end 54F of the outer cover portion 54 are flush. Therefore, the area near the discharge hole 66 of the heat gun 100 is less likely to come into contact with the object to be heated. In addition, the area near the discharge hole 66 of the heat gun 100 can be inclined with respect to the plane during heating. Thus, the workability of the heat gun 100 near the object to be heated can be improved.

[0092] As shown in Figure 9, the length 54L of the outer cover portion 54 in the front-rear direction is shorter than the length 52L of the inner cover portion 52 in the front-rear direction. By having a portion of the inner cover portion 52 that is exposed to the outside without being covered by the outer cover portion 54, the air cooling effect of the inner cover portion 52 can be improved.

[0093] As described above, the front end 54F of the outer cover portion 54 is positioned behind the front end 52F of the inner cover portion 52. Also, the rear end 54B of the outer cover portion 54 is positioned in front of the rear end 52B of the inner cover portion 52. In this way, the outer cover portion 54 covers a predetermined range included in the front-rear direction from the front end 52F to the rear end 52B of the inner cover portion 52.

[0094] The length 54L of the outer cover portion 54 is preferably one-third or more of the length 52L of the inner cover portion 52, and more preferably one-half or more. This configuration reduces or suppresses heat transfer from the inner cover portion 52 to the outer cover portion 54, while making it easier for the user to grasp the outer cover portion 54 and allowing the removal mechanism 50 to be used effectively.

[0095] Figure 10 shows the region S1 occupied by the heating element 70 and the region S2 occupied by the outer cover 54 when the heat gun 100 is viewed from above. The region S3 where regions S1 and S2 overlap is also shown. For ease of understanding, regions S1 and S2 are hatched, and region S3 is cross-hatched. The region S1 occupied by the heating element 70 refers to the region occupied by the component that heats the airflow within the heater housing 60. In this embodiment, region S1 is the region occupied by the support 72 and the heating element 76. Note that in Figure 10, the removal mechanism 50 is positioned at its initial rear end.

[0096] As shown in Figure 10, region S3 is configured to have an area of ​​more than half that of region S1. That is, when the heat gun 100 is viewed from above, the outer cover portion 54 overlaps with more than half of the area of ​​the heat-generating portion 70. In the heat gun 100 of this embodiment, the through-hole 53 described above is formed, which suppresses or prevents heat transfer from the inner cover portion 52 to the outer cover portion 54. Therefore, compared to the conventional model, the area in which the outer cover portion 54 overlaps with the heat-generating portion 70 can be increased. By covering more than half of the inner cover portion 52 with the outer cover portion 54, it is possible to make it difficult for the user to touch the inner cover portion 52 and easy to grip the removal mechanism 50, thereby improving the workability of the heat gun 100.

[0097] Furthermore, when the removal mechanism 50 is moved forward to a position for removing the nozzle attachment 90, the front end 54F of the outer cover portion 54 is positioned behind the front end of the heating portion 70. Therefore, even when the removal mechanism 50 is moved to its front end, the outer cover portion 54 overlaps with more than half of the area of ​​the heating portion 70. However, the outer cover portion 54 may be configured to overlap with more than half of the area of ​​the heating portion 70 only when the removal mechanism 50 is in its initial position.

[0098] As described above, the heat gun 100 of this embodiment is equipped with an outer cover portion 54 that is positioned radially outside the inner cover portion 52 and covers a part of the inner cover portion 52 at a distance from the inner cover portion 52. Between the outer cover portion 54 and the inner cover portion 52, there is a through hole 53 that connects the front opening 540F of the front end 36F of the outer cover portion 54 to the rear opening 540B of the outer cover portion 54 that is behind the front end 36F. By forming an air layer between the outer cover portion 54 and the inner cover portion 52, heat transfer from the inner cover portion 52 to the outer cover portion 54 can be suppressed or prevented. In addition, the through hole 53 makes it easier for the inner cover portion 52 and the outer cover portion 54 to be air-cooled. Therefore, heat from the heat-generating part 70 is less likely to be transmitted to the outer cover portion 54, and the temperature rise of the outer cover portion 54 can be suppressed or prevented.

[0099] The heat gun 100 of this embodiment further includes a connecting portion 55 that connects the outer surface 522 of the inner cover portion 52 and the inner surface 541 of the outer cover portion 54, and defines a through hole 53 together with the outer cover portion 54 and the inner cover portion 52. By connecting the inner cover portion 52 and the outer cover portion 54 with the connecting portion 55, the outer cover portion 54 can be positioned radially outside the inner cover portion 52 in a simple manner. In addition, because the inner cover portion 52 and the outer cover portion 54 are connected via the connecting portion 55, the inner cover portion 52 can be operated via the outer cover portion 54. Therefore, the removal mechanism 50 can be activated by operating the outer cover portion 54 instead of the inner cover portion 52, thereby improving the convenience of the heat gun 100.

[0100] B. Other embodiments: (B1) In the first embodiment described above, an example was shown in which the outer cover portion 54 and the inner cover portion 52 are connected by four connecting portions 55. However, the number of connecting portions 55 is not limited to four, and may be set to any number of one or more, as shown below.

[0101] Figure 11 shows an example where the outer cover portion 54 and the inner cover portion 52 are connected by two connecting portions 55. In the example in Figure 11, when the removal mechanism 50 is viewed from the front, the two connecting portions 55 are located one on the left and one on the right of the center CP of the heater housing 60. Therefore, the two connecting portions 55 divide the through hole 53 into a through hole 53E that includes the region RA directly above the center CP and a through hole 53F that includes the region RB directly below the center CP. The through hole 53E is an example of a "first through hole," and the through hole 53F is an example of a "second through hole." Thus, it is also possible to configure the system without a third through hole including the region RC to the right of the center CP and a fourth through hole including the region RD to the left of the center CP. However, the system is not limited to this, and for example, only either the third or fourth through hole may be specified. Furthermore, two connecting portions 55 may be formed, one above and one below the center CP of the heater housing 60.

[0102] Figure 12 shows an example in which the outer cover portion 54 and the inner cover portion 52 are connected by three connecting portions 55. In the example in Figure 12, when the removal mechanism 50 is viewed from the front, the three connecting portions 55 are located to the upper right, upper left, and directly below the center CP, respectively. Therefore, the three connecting portions 55 divide the through hole 53 into a through hole 53G including the region RA directly above the center CP, a through hole 53H including the region RC to the right of the center CP, and a through hole 53I including the region RD to the left of the center CP. Through holes 53G, 53H, and 53I are examples of the "first through hole," "third through hole," and "fourth through hole," respectively. Thus, only one of the first through hole or the second through hole may be provided.

[0103] Figure 13 shows an example in which the outer cover portion 54 and the inner cover portion 52 are connected by a single connecting portion 55. The connecting portion is located only directly below the central CP. Therefore, the connecting portion 55, together with the outer cover portion 54 and the inner cover portion 52, defines a single through-hole 53J. The through-hole 53J includes the region RA directly above the central CP, the region RC to the right of the central CP, and the region RD to the left of the central CP. The through-hole 53J is an example of a "first through-hole," a "third through-hole," a "fourth through-hole," etc. Thus, a single through-hole 53 may be defined. The single through-hole may be formed to include multiple regions above, below, to the left, and to the right of the central CP.

[0104] (B2) In the first embodiment described above, an example was shown in which the outer cover portion 54 and the inner cover portion 52 are connected by a connecting portion 55. In contrast, the heat gun 100 does not need to have a connecting portion 55. In this case, the outer cover portion 54 can be connected to the main body housing 10, for example, so as to cover at least a part of the inner cover portion 52 while being spaced apart from it. In this case, the outer cover portion 54 may be formed integrally with the main body housing 10.

[0105] (B3) In the first embodiment described above, an example was shown in which the heat gun 100 is equipped with a removal mechanism 50. In contrast, the heat gun 100 may also be configured without a removal mechanism 50. In this case, the inner cover portion 52 may be fixed to the opening 144 of the blower housing 14, or it may be formed integrally with the main housing 10. The outer cover portion 54 may be connected to the inner cover portion 52 via a connecting portion 55. If the connecting portion 55 is not formed, the outer cover portion 54 may be directly connected to the main housing 10. In this case, the outer cover portion 54 may be formed integrally with the main housing 10.

[0106] (B4) In the first embodiment described above, an example was shown in which the rotation axis RX of the motor shaft 322 is configured to be substantially parallel to the long axis direction of the heater housing 60 (more specifically, the long axis direction of the main body 62). In contrast, the rotation axis RX of the motor shaft 322 may be configured to intersect or be perpendicular to the long axis direction.

[0107] (B5) In the first embodiment described above, an example was shown in which the outer cover portion 54, inner cover portion 52, extruded portion 58, and heater housing 60 have a substantially cylindrical shape that is elongated along the long axis. In contrast, at least one of the outer cover portion 54, inner cover portion 52, extruded portion 58, and heater housing 60 may have a cylindrical shape other than a cylindrical shape. For example, the shape of the cross section perpendicular to the long axis of at least one of these members may be a variety of geometric shapes other than a circle, including polygons such as triangles, squares, pentagons, hexagons, and octagons. The cross-sectional shape of at least one of these members may be elliptical or oval. The outer cover portion 54 and inner cover portion 52 can be any shape, provided that the function of covering the heating portion 70 and heater housing 60 is ensured. The cross-sectional shapes of the outer cover portion 54, inner cover portion 52, extruded portion 58, and heater housing 60 do not have to be the same as each other, and may be the same as each other by any combination. If the outer cover portion 54, the inner cover portion 52, and the extrusion portion 58 have the function of a removal mechanism 50, it is preferable that at least the extrusion portion 58 has a shape corresponding to the outer shape of the heater housing 60.

[0108] If the cross-sectional shape of the heater housing 60 is not circular, the center CP of the heater housing 60 may be the centroid of the cross-sectional shape of the heater housing 60. Alternatively, the center CP of the heater housing 60 may be, for example, the intersection point of a first line parallel to the left-right direction at the position where the width in the left-right direction is maximum in the cross-sectional shape of the heater housing 60, and a second line parallel to the up-down direction at the position where the width (height) in the up-down direction is maximum.

[0109] The correspondence between each component (feature) of the above embodiments and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiments is merely an example and does not limit each component of the present disclosure or invention.

[0110] Heat gun 100 is an example of a "heat gun". Motor 32 is an example of a "motor". Fan 34 is an example of a "fan". Heating element 70 is an example of a "heating element". Heater housing 60 is an example of a "heater housing". Main body 62 is an example of a "main body". The long axis direction of the heater housing 60 and the long axis direction of the main body 62 are examples of "long axis directions". Flow path 64 is an example of a "flow path". Discharge hole 66 is an example of a "discharge hole". Inner cover part 52 is an example of an "inner cover part". Outer cover part 54 is an example of an "outer cover part". Through hole 53 is an example of a "through hole". The first through hole 53A, second through hole 53B, third through hole 53C, and fourth through hole 53D are examples of the "first through hole", "second through hole", "third through hole", and "fourth through hole", respectively. Gripping part 20 is an example of a "gripping part". The connecting part 55 is an example of a "connecting part". The main body housing 10 is an example of a "main body housing". Lengths 52L and 54L are examples of the "length of the inner cover" and "length of the outer cover", respectively. Front end 52F and front end 54F are examples of the "front end of the outer cover" and "front end of the inner cover", respectively. The protruding part 56 is an example of a "protruding part". The extruded part 58 is an example of an "extruded part". Length L1 is an example of the "maximum length in the front-rear direction". Battery BT is an example of a "battery". Battery mounting part 40 is an example of a "battery mounting part".

[0111] In view of the spirit of the present invention and the embodiments described above, the following embodiments can be constructed. At least one of the following embodiments may be adopted in combination with the features of the embodiments and their modifications, or at least one of the features described in each claim. [Aspect 1] The thickness of the connecting portion in the direction perpendicular to the radial direction is thinner than the thickness of the outer cover portion in the radial direction. The thickness TH1 of the above embodiment is an example of the "thickness of the connecting portion" in this embodiment. The thickness TH2 of the above embodiment is an example of the "radial thickness of the outer cover portion" in this embodiment. By configuring it in this way, the thickness of the connection part can be made thinner than that of the outer cover part, which efficiently suppresses or prevents heat transfer from the inner cover part to the outer cover part through the connection part. In addition, since the volume of the air layer between the inner cover part and the outer cover part is increased, heat transfer from the inner cover part to the outer cover part can be suppressed or prevented more efficiently.

[0112] This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be replaced or combined as appropriate in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of Symbols]

[0113] 10...Main housing, 12...Handle housing, 14...Blower housing, 14B...Rear, 14L...Left side, 14R...Right side, 18...Operating section, 20...Grip section, 24...Switch, 26...Trigger, 28...Lock-on button, 30...Blower section, 32...Motor, 34...Fan, 36...Inner housing, 36F...Front end, 38...Flow path, 40...Battery Mounting section, 40B...rear, 40L...left side, 40R...right side, 42...terminal, 44...guide groove, 46...terminal, 50...mechanism, 52...inner cover section, 52B...rear end, 52F...front end, 52P...protrusion, 53, 53E, 53F, 53G, 53H, 53I, 53J...through hole, 53A...first through hole, 53B...second through hole, 53C...third through hole, 53D...third 4 through holes, 54...outer cover part, 54B...rear end, 54F...front end, 55...connection part, 56...protrusion part, 58...extrusion part, 58F...front end, 60...heater housing, 60F...front end part, 62...main body, 64...flow path, 66...discharge hole, 70...heating part, 72...support, 74...groove, 76...heating element, 80...controller, 90...nozzle attachment, 100...heat gun, 142...intake hole, 144...opening, 148...guide protrusion, 320...motor body part, 322...motor shaft, 521...inner surface, 522...outer surface, 528...guide groove, 540B...rear opening, 540F...front opening, 541...inner surface, 542...outer surface, 622...steel pipe, 624...mica pipe, BT...battery, CP...center, FL...flow path, RX...rotating shaft

Claims

1. A heat gun that heats and blows out air, A fan rotates to generate airflow through the drive of a motor, A heating element that generates heat when electricity is applied, A heater housing for housing the aforementioned heating element, A cylindrical body extending along the long axis defining the front-to-back direction of the heat gun, A passage is defined inside the main body and through which the airflow passes, A heater housing comprising: a heater housing provided at the front end of the main body, which has a discharge hole for discharging the airflow passing through the passage to the outside; An inner cover portion is positioned radially outward from the heater housing, perpendicular to the longitudinal axis, and covers at least a portion of the heater housing. The outer cover portion is positioned radially outward from the inner cover portion and covers at least a part of the inner cover portion at a distance from the inner cover portion, At least one through hole is defined between the outer cover portion and the inner cover portion. Heat gun.

2. A heat gun according to claim 1, Furthermore, it is equipped with a gripping portion that extends in a direction intersecting the longitudinal axis, When the direction in which the gripping portion extends defines the vertical direction of the heat gun, The outer cover portion overlaps with more than half of the area of ​​the heating element when the heat gun is viewed from above. Heat gun.

3. A heat gun according to claim 1 or claim 2, Furthermore, it includes at least one connecting portion that connects the outer surface of the inner cover portion and the inner surface of the outer cover portion, and together with the outer cover portion and the inner cover portion, defines the at least one through hole. Heat gun.

4. A heat gun according to claim 3, Furthermore, it includes a main housing that accommodates the aforementioned fan, The outer cover portion is positioned at a distance from the inner cover portion and the main housing. Heat gun.

5. A heat gun according to claim 3, Furthermore, it is equipped with a gripping portion that extends in a direction intersecting the longitudinal axis, When the direction in which the gripping portion extends defines the vertical direction of the heat gun, The at least one through-hole is defined to include at least one of a first through-hole located directly above the center of the heater housing when the heat gun is viewed from the front, and a second through-hole located directly below the center. Heat gun.

6. A heat gun according to any one of claims 3 to 5, Furthermore, it is equipped with a gripping portion that extends in a direction intersecting the longitudinal axis, When the direction in which the gripping portion extends defines the vertical direction of the heat gun, and the directions perpendicular to the front-to-back direction and the vertical direction define the left-to-right direction of the heat gun, The at least one through-hole is defined to include at least one of a third through-hole located to the right of the center of the heater housing when the heat gun is viewed from the front, and a fourth through-hole located to the left of the center. Heat gun.

7. A heat gun according to any one of claims 1 to 6, Furthermore, it includes a main housing that accommodates the aforementioned fan, When the heat gun is viewed from the front, the at least one through-hole is positioned to include an area that does not overlap with the main housing. Heat gun.

8. A heat gun according to any one of claims 1 to 7, The length of the outer cover portion in the front-rear direction is shorter than the length of the inner cover portion in the front-rear direction. Heat gun.

9. A heat gun according to any one of claims 1 to 8, The front end of the outer cover portion is positioned rearward from the front end of the inner cover portion. Heat gun.

10. A heat gun according to any one of claims 1 to 9, The outer cover portion includes a projection that protrudes radially outward from the outer surface of the outer cover portion. Heat gun.

11. A heat gun according to any one of claims 1 to 10, Furthermore, it includes an extrusion section positioned between the heater housing and the inner cover section and connected to the inner cover section, The outer cover portion and the inner cover portion are integrally movable forward. The extrusion portion moves forward together with the inner cover portion when the outer cover portion is moved forward, and is capable of pushing forward the nozzle attachment attached to the front end of the heater housing. Heat gun.

12. A heat gun according to any one of claims 1 to 11, The maximum length in the front-to-back direction is 160 mm or more and 200 mm or less. Heat gun.

13. A heat gun according to any one of claims 1 to 12, The distance from the outer surface of the inner cover to the inner surface of the outer cover is 5 mm or more. Heat gun.

14. A heat gun according to any one of claims 1 to 13, The ratio of the width of the outer surface contour of the outer cover portion to the width of the outer surface contour of the inner cover portion in the radial direction is 125% or more. Heat gun.

15. A heat gun according to any one of claims 1 to 14, Furthermore, it includes a battery mounting section for electrically connecting a battery that supplies power to the heating section, The maximum temperature at the front end of the heater housing when the heat gun is powered by the battery is 600°C or higher. Heat gun.

Images