JP2017004616A - Electric heating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric heating equipment in which a heater can be surely fixed to a casing and which uses an insulator capable of automating a manufacturing process.SOLUTION: The present invention relates to the electric heating equipment comprising a heater 3 which is and held by an insulator 4 fitted to a casing 2. In the insulator 4, a first projection 6 and a second projection 7 that are orthogonal with a center axis of a cylindrical part 5 that is bottomed and has a cylindrical shape, are formed while being separated in a direction of the center axis and displaced around the axis. A protruding dimension of the second projection 7 is made larger than a protruding dimension of the first projection 6, and a width of the second projection 7 is made larger than a width of the first projection 6. The casing 2 is formed from a tabular member 13 that is thinner than an axial distance between the first projection 6 and the second projection 7. In the casing, a fitting hole 14 is formed that includes a circular hole 15 corresponding to the cylindrical part 5 and a notch 16 corresponding to the first projection 6. The circular hole 15 is formed in such a manner that the cylindrical part 5 is rotatable around the center axis, and the notch 16 is formed in such a manner that the first projection 6 can pass but the second projection 7 cannot pass.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an electric heating apparatus in which a heater is held in an insulated state using an insulator.

  Conventionally, this type of electric heating apparatus is used to hold a heater such as a sheathed heater in an insulated state using a lever in a casing (see, for example, Patent Document 1). As shown in FIG. 13, the insulator 101 used in such an electric heating device 100 has a flange-like shape on the outer periphery on the other end side of the cylindrical portion 104 having an opening 102 on one end side and an insertion space 103 inside. In general, a portion 105 is formed and an insertion hole 107 having a diameter smaller than that of the insertion space 103 is formed in the bottom portion 106 on the other end side of the cylindrical portion 104. As shown in FIG. 14, such an insulator 101 has one end inserted into a mounting hole 112 formed in the casing 111, and the end of the sheathed heater 121 is inserted into the insertion space 103 from the opening 102. The lead portion 122 of the sheathed heater 121 is exposed from the other end side of the insulator 101 through the insertion hole 107 and is fixed to the sheathed heater 121 by bending the lead portion 122. Then, the sheath heater 121 is fixed to the casing 111 by attaching the insulator 101 at both ends of the rod-shaped sheath heater 121 in the same manner. Instead of bending the lead portion 122, a connector (not shown) is fixed to the lead portion 122, and the insulator 101 is attached to the sheathed heater 121, so that the sheathed heater 121 is similarly fixed to the casing 111. You can also.

JP-A-5-33949

  However, when the sheathed heater 121 is fixed to the casing 111 using such an insulator 101, the lead portion 122 is generally bent by a human hand. For this reason, there has been a problem that mechanization of the process of attaching the sheathed heater 121 is difficult. Further, when the lead portion 122 of the sheathed heater 121 is bent, there is a possibility that the plug for sealing the heater pipe 123 may be damaged. On the other hand, when the connector is fixed to the lead portion 122, the sheath heater 121 and the casing 111 are not fixed when the lead portion 122 and the connector are disconnected.

  An object of the present invention is to solve the above problems, and to provide an electric heating apparatus using an insulator that can fix the heater to the casing reliably and can automate the manufacturing process.

  The electric heating appliance according to claim 1 of the present invention is an electric heating appliance comprising a casing, an insulator attached to the casing, and a heater insulated by the insulator, wherein the insulator has one end side. It has an open bottomed tubular cylindrical portion, an insertion hole is formed in the bottom portion on the other end side of the tubular portion, and the outer surface of the tubular portion intersects the central axis of the tubular portion. A first protrusion and a second protrusion are formed, and the first protrusion and the second protrusion are provided apart from each other in the direction of the central axis, and the formation direction of the first protrusion and the formation direction of the second protrusion are around the central axis. The casing is formed of a plate-like member that is thinner than the distance between the first protrusion and the second protrusion in the central axis direction, and the mounting hole is formed in the casing. A circular hole corresponding to the cylindrical portion, and the first protrusion The circular hole portion is formed to have an inner diameter dimension that allows the cylindrical portion to rotate about a central axis, and the first protrusion can pass through the notch portion. In addition, the second protrusion is formed in a size that cannot pass through.

  Moreover, the electric heating appliance according to claim 2 of the present invention is the electric heater according to claim 1, wherein the insulator is provided with a plurality of the second protrusions and the same number or a multiple of the number of the first protrusions. In this case, the first protrusions are provided at equiangular intervals with respect to the central axis.

  Further, in the electric heating apparatus according to claim 3 of the present invention, in claim 2, when the number of the second protrusions is n, the first protrusions and the second protrusions are shifted by π / n around the central axis. It is a thing.

  In addition, according to a fourth aspect of the present invention, in the electric heating apparatus according to any one of the first to third aspects, the notch portion of the casing is brought into contact with the second protrusion to thereby increase the rotation range of the insulator. A contact piece for limiting is provided.

Furthermore, in the electric heating apparatus according to claim 5 of the present invention, in any one of claims 1 to 4, a recess is formed on the second protrusion side of the first protrusion and is engaged with the recess. A locking claw is formed on the casing.

  The electric heating appliance according to claim 1 of the present invention is configured as described above, so that the insulator is inserted into the mounting hole from the first protrusion side and rotated around a central axis, thereby the insulator. Can be easily attached to the casing, whereby the heater can be easily held in the casing in an insulated state.

  The insulator is provided with a plurality of the second protrusions and the same number or a multiple of the number of the first protrusions, and the second protrusions and the first protrusions when the plurality of second protrusions are provided are equiangularly spaced with respect to the central axis. So that the notch portion of the mounting hole is closed by the second protrusion, regardless of whether the insulator is rotated clockwise around the central axis or counterclockwise. Therefore, the lever can be attached by rotating it left or right.

  In addition, when the number of the second protrusions is n, the insulator is rotated clockwise around the central axis by shifting the first protrusion and the second protrusion by π / n around the central axis. In any case of turning counterclockwise, the same angle is turned, so that the direction of the insulator in the electric heating apparatus can be made uniform.

  In addition, the lever can be easily aligned by providing a contact piece for limiting the rotation range of the lever in contact with the second protrusion in the cutout portion of the casing.

  In addition, a recess is formed on the second protrusion side of the first protrusion, and a locking claw that engages with the recess is formed in the casing, so that the locking claw is fitted into the recess. The lever is prevented from rotating, thereby preventing the lever from being removed from the casing.

It is a front view of the oven toaster as an electric heating equipment which shows a first embodiment of the present invention. It is a perspective view of an insulator same as the above. FIG. 2 is an external view of the insulator, wherein (a) is a front view, (b) is a rear view, (c) is a plan view, and (d) is a right side view. It is sectional drawing of an insulator similarly, (a) is AA sectional drawing in Fig.2 (a), (b) is BB sectional drawing. The same is the main part of the casing, (a) is an external view of the periphery of the mounting hole corresponding to one end of the sheathed heater as seen from the other side of the plate-like member, and (b) is a CC cross section in (a). FIG. 4C is an external view of the periphery of the mounting hole corresponding to the other end side of the sheathed heater as viewed from the other surface side of the plate member. It is explanatory drawing which shows the attachment procedure to the casing of an insulator similarly. It is explanatory drawing which shows the attachment procedure to the casing of an insulator similarly. It is explanatory drawing which shows the attachment procedure to the casing of an insulator similarly. It is explanatory drawing which shows the attachment procedure to the casing of an insulator similarly. The principal part of the oven toaster as an electric heating apparatus which shows 2nd embodiment of this invention is shown, (a) is a front view of an insulator, (b) is an attachment hole periphery from the other surface side of a plate-shaped member. FIG. The principal part of the oven toaster as an electric heating apparatus which shows 3rd embodiment of this invention is shown, (a) is a front view of an insulator, (b) is an attachment hole periphery from the other surface side of a plate-shaped member. FIG. It is an external view of the attachment hole periphery seen from the other surface side of the plate-shaped member which shows other embodiment of this invention. It is a figure which shows the insulator of the conventional electric heating apparatus, (a) is a front view, (b) is ZZ sectional drawing in (a), (c) is a perspective view. It is explanatory drawing which shows the attachment procedure to the casing of an insulator similarly.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 9. Reference numeral 1 denotes an oven toaster as an electric heating apparatus of the present invention. The oven toaster 1 includes a casing 2, a sheathed heater 3, and an insulator 4.

  The insulator 4 is integrally formed of ceramic. The insulator 4 includes a cylindrical portion 5, a first protrusion 6, and a second protrusion 7.

The cylindrical portion 5 is formed into a bottomed cylindrical outer diameter D _1. The cylindrical portion 5, whereas the side openings 8 are formed in, the insertion space 9 having an inner diameter D ₂ is formed inside, having a bottom 10 on the other side. And, in the center of the bottom portion 10, insertion holes 11 of the inner diameter D ₃ is formed.

The first protrusion 6 is formed at two locations on one end of the cylindrical portion 5. The first protrusions 6 are formed to extend in the radial direction with respect to the central axis X of the cylindrical portion 5. The first protrusion 6 is formed in a rounded rectangular parallelepiped shape. Further, the two first protrusions 6 are provided symmetrically with respect to the central axis X. A recess 12 is formed on the base end side of the other side of the first protrusion 6. Incidentally, the protruding amount from the central axis X of the first protrusion 6 is P _1. Further, the width of the first protrusion 6, that is, the dimension of the first protrusion 6 in the direction orthogonal to the central axis X and orthogonal to the radiation direction with reference to the central axis X is W ₁ .

The second protrusion 7 is formed at two locations on the other side of the cylindrical portion 5 with respect to the first protrusion 6. The second protrusion 7 is formed with a distance G in the direction of the central axis X between the second protrusion 7 and the first protrusion 6. The second protrusions 7 are formed to extend in the radial direction with respect to the central axis X of the cylindrical portion 5. The second protrusion 7 is formed in a rounded rectangular parallelepiped shape. Further, the two second protrusions 7 are provided symmetrically with respect to the central axis X. The second protrusion 7 is formed to be shifted from the first protrusion 6 by π / 2, that is, 90 ° around the central axis X. Incidentally, the protruding amount from the central axis X of the second projection 7 is P _2. Further, the dimensions of the second protrusion 7 of width, i.e., the central axis line direction of the second projection 7 which X and orthogonal and perpendicular to the radiation direction with respect to the central axis X is W _2.

The casing 2 is constituted by a plate-like member 13 such as a metal plate having a thickness T. The thickness T of the plate-like member 13 is smaller than the distance G in the central axis X direction between the first protrusion 6 and the second protrusion 7 in the insulator 4. An attachment hole 14 is formed in the plate member 13. The mounting hole 14 will be described in detail. The mounting hole 14 includes a circular hole portion 15 and two cutout portions 16. The circular hole portion 15 is formed in a circular shape having a diameter D ₄ corresponding to the cylindrical portion 5 of the insulator 4. The diameter D ₄ of the circular hole portion 15 is larger than the outer diameter D ₁ of the cylindrical portion 5 of the insulator 4. The notch 16 is formed in a rounded square corresponding to the first protrusion 6 of the insulator 4. The width _{W 3} of one notch 16A is formed smaller than the width _{W 4} of the other notch 16B. The distance from the center Y of the circular hole portion 15 to the tip of the notch 16 is _{P 3,} both cutouts 16A, equal 16B. Further, a contact piece 17 is formed on the side edge 18 of the other cutout portion 16B by bending on one surface side of the plate-like member 13. Incidentally, the cut portion 16B, by being formed by being expanded on the side edge 18 side, the width W ₄ is greater than the width W ₃ of the notch 16A. That is, the side edge 18 of the notch 16B is not point-symmetrical with respect to the side edge 19 of the corresponding notch 16A and the center Y of the circular hole 15, but the other side of the notch 16B The side edge 20 is point-symmetric with respect to the other side edge 21 of the cutout portion 16A corresponding thereto and the center Y of the circular hole portion 15 as a reference. The distance _{W 5} from the side edges 20 of the notch portion 16B until the contact piece 17 is larger than the width _{W 3} of the notch 16A, it is smaller than the width _{W 4} of the notch 16B. Note that P ₁ <P ₃ <P ₂ . In _addition, a _{W 1 <W 3 <W 5} <W 2. Further, a locking claw portion 22 is formed in the plate-like member 13 so as to cut out the mounting hole 14. The latching claw portion 22 is inserted into the concave portion 12 of the first protrusion 6 of the insulator 4 by being bent to the other surface side of the plate-like member 13.

The sheathed heater 3 as is well known, the heating element and the insulating powder are inserted (not shown) in the heater pipe 23 of diameter D _5, the lead portion 24 of diameter D ₆ at the end of the heater pipe 23 is projected To do. The diameter D ₅ of the heater pipe 23 is slightly smaller than the inner diameter D ₂ of the insertion space 9 of the insulator 4. Moreover, the diameter D ₆ of the lead portion 24 is smaller than the inner diameter D ₃ of the insertion hole 11 of the insulator 4.

Next, a procedure for attaching the sheathed heater 3 and the insulator 4 to the casing 2 in the manufacturing process of the oven toaster 1 of the present embodiment will be described. First, as shown in FIG. 5, one end side of the sheathed heater 3 is inserted into the mounting hole 14 from the other surface side of the plate-like member 13 of the casing 2. Then, the insulator 4 is inserted into the mounting hole 14 from one surface side of the plate-like member 13 so as to cover one end portion of the sheathed heater 3. At this time, the first protrusion 6 of the insulator 4 passes through the notch 16 of the mounting hole 14. As described above, since P ₁ <P ₃ and W ₁ <W ₃ , the first protrusion 6 can pass through the notch 16. In addition, since D ₂ > D ₅ and D ₃ > D ₆ , the end of the heater pipe 23 of the sheathed heater 3 is inserted into the insertion space 9 of the insulator 4, and the lead portion 24 is connected to the insulator 4. The insertion hole 11 is inserted. As shown in FIG. 6, the insulator 4 is inserted until the second protrusion 7 comes into contact with the surface on the one surface side of the plate-like member 13.

As described above, since G> T and D ₁ <D ₄ , the insulator 4 can be rotated around the central axis X while being inserted into the mounting hole 14. Then, the insulator 4 is rotated by π / 2 (= 90 °) about the central axis X so as to change from the state of FIG. 6 to the state of FIG. In this example, as shown in FIGS. 6A and 7A, when viewed from the other surface side of the plate-like member 13, the plate member 13 is rotated counterclockwise by π / 2 (= 90 °). As described above, when the lever 4 is rotated, one of the second protrusions 7 is in contact with the contact piece 17, and further rotation of the lever 4 is prevented. In this state, the concave portion 12 of one of the first protrusions 6 faces the locking claw portion 22. The two second protrusions 7 are positioned so as to overlap with the notches 16A and 16B, respectively. As described above, since P ₃ <P ₂ and W ₃ <W ₅ <W ₂ , the second protrusion 7 cannot pass through the notch 16. On the other hand, the first protrusion 6 is located away from the notch 16. Therefore, the insulator 4 does not come out from the mounting hole 14 in the central axis X direction. Further, since W ₄ > W ₅ and D ₁ <D ₄ , a slight gap is formed between the second protrusion 7 and the side edge 18 and between the cylindrical portion 5 and the circular hole portion 15. However, most of the notch 16 is blocked by the second protrusion 7. Further, as shown in FIG. 8, the locking claw portion 22 is bent to the other surface side of the plate-like member 13 and inserted into the concave portion 12 of the first protrusion 6, whereby the central axis of the insulator 4 Rotation around X is prevented. Therefore, after the insulator 4 is rotated around the central axis X, the insulator 4 does not come off on the one surface side of the plate-like member 13 along the central axis X.

  The mounting hole 14 ′ corresponding to the other end side of the sheathed heater 3 is formed symmetrically with respect to the mounting hole 14 corresponding to the one end side, as shown in FIG. In this case, the insulator 4 is similarly attached to the casing 2 except that the insulator 4 is rotated by π / 2 (= 90 °) clockwise in FIG. As described above, the insulator 4 is provided with the first protrusion 6 and the second protrusion 7 being axially symmetrical with respect to the cylindrical portion 5, and the first protrusion 6 and the second protrusion 7 have a central axis X. It is shifted by π / 2 (= 90 °) with respect to the reference, i.e., the angle formed by one first protrusion 6 and two adjacent second protrusions 7 is equal, so that it can be rotated to the left or right around the central axis X. Even if it is, it becomes the same posture with respect to the casing 2. Accordingly, the common insulator 4 can be used regardless of whether it is attached clockwise or counterclockwise.

  Thus, by attaching the insulator 4 to the casing 2, when the sheathed heater 3 is held in an insulated state, it is not necessary to bend the lead portion 24, so the sheathed heater 3 is attached to the casing 2. Not only can the process be mechanized, but also the breakage of a plug (not shown) that seals the heater pipe 23 can be suppressed. In addition, when a connector (not shown) is fixed to the lead portion 24, the sheath heater 3 is connected to the casing 2 because the insulator 4 continues to be held by the casing 2 even if the connection between the lead portion 24 and the connector is disconnected. Keeps on.

As described above, the oven toaster 1 as an electric heating apparatus according to the present invention includes the casing 2, the insulator 4 attached to the casing 2, and the heater 3 insulated and held by the insulator 4. The insulator 4 has a bottomed cylindrical tubular portion 5 that is open at one end side, an insertion hole 11 is formed in the bottom portion 10 on the other end side of the tubular portion 5, and the central axis X of the tubular portion 5 The first protrusion 6 and the second protrusion 7 are formed on the outer surface of the cylindrical portion 5 orthogonally to each other, and the first protrusion 6 and the second protrusion 7 are provided apart from each other in the central axis X direction. The formation direction of the protrusion 6 and the formation direction of the second protrusion 7 are shifted around the central axis X, and the central axis is more than the projection dimension P ₁ from the central axis X to the tip of the first protrusion 6. large cities protrusion dimension P ₂ to the tip of the second protrusion 7 from the X, before The perpendicular to the center axis X and the projecting direction than the width dimension W ₁ of the first protrusion 6, the second protrusion 7 widthwise dimension W ₂ large cities that is perpendicular to the central axis X and the projecting direction, the casing 2 is composed of a plate-like member 13 that is thinner than the distance G in the central axis X direction of the first protrusion 6 and the second protrusion 7 of the insulator 4, and an attachment hole 14 is formed in the casing 2. The circular hole portion 15 corresponding to the cylindrical portion 5 and the notch portion 16 corresponding to the first protrusion 6 are configured, and the circular hole portion 15 is arranged with respect to the cylindrical portion 5 as a central axis X. By forming the inner diameter dimension D ₄ that can rotate around and the notch portion 16 having a dimension that allows the first protrusion 6 to pass through and the second protrusion 7 not to pass through, the insulator 18 4 is inserted into the mounting hole 14 from the first protrusion 6 side and rotated about the central axis X Thus, the insulator 4 can be easily attached to the casing 2, whereby not only the sheath heater 3 can be easily held in the casing 2 in an insulated state, but also the sheath 2 can be manufactured at the time of manufacturing the oven toaster 1. Since it is not necessary to bend the lead portion 24 of the heater 3, the manufacturing process can be automated.

  In the oven toaster 1 as an electric heating apparatus according to the present invention, the insulator 4 is provided with a plurality of the second protrusions 7 and the same number or a multiple of the number of the first protrusions 6 as well as the second protrusions 7 and a plurality of the protrusions. The first protrusions 5 are provided at equiangular intervals with respect to the central axis X, so that the insulator 4 is rotated clockwise around the central axis X and when rotated counterclockwise. In any case, since the notch 16 of the mounting hole 14 can be closed by the second protrusion 7, the lever 4 can be rotated and mounted to the left or right.

  In the oven toaster 1 as an electric heating apparatus of the present invention, the number n of the second protrusions 7 is 2, and the first protrusions 6 and the second protrusions 7 are π / 2 (= 90 ° around the central axis X). ) By shifting, the lever 4 is rotated by π / 2 (= 90 °) regardless of whether the insulator 4 is rotated clockwise around the central axis X or counterclockwise. Therefore, the direction of the insulator 4 in the oven toaster 1 can be aligned.

  Further, the oven toaster 1 as an electric heating apparatus of the present invention has a contact piece 17 for restricting the rotation range of the insulator 4 by contacting the second protrusion 7 in the notch portion 16B of the casing 2. By providing, the insulator 4 can be easily aligned.

  Further, the oven toaster 1 as an electric heating apparatus of the present invention forms a recess 12 on the second projection 7 side of the first projection 6 and also has a locking claw portion 22 engaged with the recess 12 in the casing 2. By forming the engagement claw portion 22 into the recess 12, the lever 4 is prevented from rotating, thereby preventing the lever 4 from being detached from the casing 2. Is.

  Next, a second embodiment of the present invention will be described based on FIG. The oven toaster in the second embodiment has a casing 31, a sheathed heater (not shown), and an insulator 32, as in the first embodiment. As shown in FIG. 10A, the insulator 32 includes a cylindrical portion 33, a first protrusion 34, and a second protrusion 35. The tubular portion 33 has an opening 36 formed on one side, an insertion space 37 formed therein, and a bottom 38 on the other side. An insertion hole 39 is formed at the center of the bottom portion 38.

  The first protrusion 34 is formed at one end on one end of the cylindrical portion 33. The first protrusion 34 is formed to extend in the radial direction with respect to the central axis of the cylindrical portion 33. The first protrusion 34 is formed in a rounded rectangular parallelepiped shape. A recess (not shown) is formed on the other base end side of the first protrusion 34.

  The second protrusion 35 is formed at two locations on the other side of the cylindrical portion 33 with respect to the first protrusion 34. The second protrusion 35 is formed between the first protrusion 34 and an interval in the central axis direction. These second protrusions 35 are formed to extend in the radial direction with the central axis of the cylindrical portion 33 as a reference. The second protrusion 35 is formed in a rounded rectangular parallelepiped shape. Further, the two second protrusions 35 are provided symmetrically with respect to the central axis. The second protrusion 35 is formed to be shifted from the first protrusion 34 by π / 2, that is, 90 ° around the central axis. In addition, the relationship between the protrusion amount and the width of the first protrusion 34 and the second protrusion 35 is the same as that in the first embodiment.

  The casing 31 is constituted by a plate-like member 40 such as a metal plate. Note that the thickness of the plate-like member 40 is smaller than the distance between the first protrusion 34 and the second protrusion 35 in the central axis direction of the insulator 32. An attachment hole 41 is formed in the plate member 40. The mounting hole 41 will be described in detail. The mounting hole 41 includes a circular hole portion 42 and one notch portion 43. The circular hole portion 42 is formed in a circular shape corresponding to the cylindrical portion 33 of the insulator 32. The diameter of the circular hole portion 42 is larger than the outer diameter of the cylindrical portion 33 of the insulator 32. The notch 43 is formed in a rounded square corresponding to the first protrusion 34 of the insulator 32. Further, a contact piece 45 is formed on the side edge 44 of the notch 43 by bending on one side of the plate-like member 40. Further, a locking claw portion 46 is formed in the plate-like member 40 so as to cut out the mounting hole 41. The locking claw 46 is inserted into the recess of the first protrusion 34 of the lever 32 by being bent to the other surface side of the plate-like member 40. The dimensional relationship among the first projection 34, the second projection 35, and the notch 43 is the same as the dimensional relationship between the first projection 6, the second projection 7, and the notch 16B in the first embodiment. Further, unlike the first embodiment, the fixing procedure of the insulator 32 in this embodiment is rotated clockwise by π / 2 (= 90 °). Other procedures are common to the first embodiment.

  In addition, the insulator 32 in 2nd embodiment can also be attached to the attachment hole 14 of the casing 2 in 1st embodiment. In this case, the insulator 32 is inserted into the mounting hole 14 so that the first protrusion 34 passes through the notch 16A, and then rotated around the central axis. The notches 16 </ b> A and 16 </ b> B of the mounting hole 14 are closed together by the second protrusion 35 because the second protrusion 35 is provided on the insulator 32.

  Next, a third embodiment of the present invention will be described with reference to FIG. The oven toaster in the third embodiment includes a casing 51, a sheathed heater (not shown), and an insulator 52, as in the above embodiments. As shown in FIG. 11A, the insulator 52 includes a cylindrical portion 53, a first protrusion 54, and a second protrusion 55. The cylindrical portion 53 has an opening 56 formed on one side, an insertion space 57 formed therein, and a bottom 58 on the other side. An insertion hole 59 is formed in the center of the bottom portion 58.

  The first protrusions 54 are formed at three locations on one end of the cylindrical portion 53. These first protrusions 54 are formed to extend in the radial direction with the central axis of the cylindrical portion 53 as a reference. The first protrusion 54 is formed in a rounded rectangular parallelepiped shape. Further, the first protrusions 54 are formed at equal angular intervals, that is, every 2π / 3 (= 120 °). A recess (not shown) is formed on the other base end side of the first protrusion 54.

  The second protrusion 55 is formed at three positions on the other side of the cylindrical portion 53 with respect to the first protrusion 54. The second protrusion 55 is formed at an interval in the central axis direction between the second protrusion 55 and the first protrusion 54. These second protrusions 55 are formed to extend in the radial direction with the central axis of the cylindrical portion 53 as a reference. The second protrusion 55 is formed in a rounded rectangular parallelepiped shape. Further, the three second protrusions 55 are formed at equiangular intervals, that is, every 2π / 3 (= 120 °). The second protrusion 55 is formed to be shifted from the first protrusion 54 by π / 3, that is, 60 ° around the central axis. The relationship between the protrusion amount and the width of the first protrusion 54 and the second protrusion 55 is the same as that of the first embodiment.

  The casing 51 is constituted by a plate-like member 60 such as a metal plate. The thickness of the plate member 60 is smaller than the distance between the first projection 54 and the second projection 55 in the central axis direction of the insulator 52. An attachment hole 61 is formed in the plate member 60. The mounting hole 61 will be described in detail. The mounting hole 61 includes a circular hole portion 62 and three cutout portions 63. The circular hole portion 62 is formed in a circular shape corresponding to the cylindrical portion 53 of the insulator 52. The diameter of the circular hole portion 62 is larger than the outer diameter of the cylindrical portion 53 of the insulator 52. The notch 63 is formed in a rounded square shape corresponding to the first protrusion 54 of the insulator 52. Further, a contact piece 65 is formed on one side of the plate-like member 60 at the side edge 64 of the notch 63B. Further, a locking claw portion 66 is formed in the plate member 60 so as to cut out the mounting hole 61. The locking claw 66 is inserted into the recess of the first protrusion 54 of the lever 52 by being bent toward the other surface side of the plate-like member 60. The dimensional relationship among the first projection 54, the second projection 55, and the notch 63 is the same as the dimensional relationship between the first projection 6, the second projection 7, and the notch 16 in the first embodiment. Further, the procedure for fixing the insulator 52 in the present embodiment is made to rotate counterclockwise by π / 3 (= 60 °), unlike the first embodiment. Other procedures are common to the first embodiment.

  In addition, this invention is not limited to the above embodiment, A various deformation | transformation implementation is possible without having the tooth | gear of the summary of invention. For example, in each of the above-described embodiments, the contact piece is provided in one notch portion. However, as shown in FIG. 12A, the contact piece 83 may be provided for each of the plurality of notch portions 82 of the mounting hole 81. Good. Moreover, in each said embodiment, although only one latching claw part was provided, as shown in FIG.12 (b), it corresponds to the recessed part provided in each 1st protrusion, and the same number as these recessed parts. You may provide the latching claw part 91 so that it may become.

  In the present embodiment, an oven toaster has been described as an electric heating appliance, but in short, it can be applied to any electric heating appliance that fixes a heater with an insulator. For example, it can also be applied to a heating device or other electric heating cooking appliance. The

1 Oven toaster (electric heating appliance)
2, 31, 51 Casing 3 Seeds heater (heater)
4, 32, 52 insulator 5, 33, 53 cylindrical portion 6, 34, 54 first protrusion 7, 35, 55 second protrusion 10, 38, 58 bottom 11, 39, 59 through-hole 12 recess 13, 40, 60 Plate-like member 14, 41, 61 Mounting hole 15, 42, 62 Circular hole part 16, 16A, 16B, 43, 63, 63B Notch part 17, 45, 65 Contact piece 22, 46, 66 Locking claw part X Center axis

Claims (5)

In an electric heating appliance comprising a casing, an insulator attached to the casing, and a heater insulated by the insulator,
The insulator has a cylindrical portion with a bottom that is open at one end, and an insertion hole is formed in a bottom portion at the other end of the cylindrical portion, and intersects the central axis of the cylindrical portion and the cylinder Forming a first protrusion and a second protrusion on the outer surface of the shaped portion, and providing the first protrusion and the second protrusion apart from each other in the direction of the central axis, and forming the first protrusion and the second protrusion. And shifted around the central axis,
The casing is formed of a plate-like member that is thinner than the distance between the first protrusion and the second protrusion of the insulator in the central axis direction, and an attachment hole is formed in the casing. The attachment hole corresponds to the cylindrical portion. A circular hole part and a cutout part corresponding to the first protrusion, the circular hole part having an inner diameter dimension that allows the cylindrical part to rotate about a central axis, and the cutout part. An electric heating apparatus characterized in that the portion is formed to have a size that allows the first protrusion to pass therethrough and prevents the second protrusion from passing therethrough.   A plurality of the second protrusions and the same number or a multiple of the number of the first protrusions are provided on the insulator, and the second protrusions and the first protrusions when the plurality of second protrusions are provided are provided at equiangular intervals with respect to the central axis. The electric heating apparatus according to claim 1, wherein   The electric heating apparatus according to claim 2, wherein when the number of the second protrusions is n, the first protrusion and the second protrusion are formed by being shifted by π / n around the central axis.   The contact piece for restricting the rotation range of the said insulator by making it contact | abut to said 2nd protrusion in the notch part of the said casing was provided, The Claim 1 thru | or 3 characterized by the above-mentioned. Electric heating appliances.   5. The recess according to claim 1, wherein a recess is formed in the first protrusion on the second protrusion side, and a locking claw that engages with the recess is formed in the casing. Electric heating appliances.

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