JP5393633B2 - Gas burner - Google Patents

Description

  The present invention relates to a gas burner used for a gas stove.

  A burner used for a gas stove is designed to cover the upper portion of the burner cap with a protective cap in order to prevent intrusion of foreign matter or spilled food into the stove during cooking.

  Conventionally, in a gas burner provided with a protective cap, a plurality of protrusions protruding upward at predetermined intervals in the circumferential direction of the burner cap are provided, and an annular wire spring is held by these protrusions, and extends below the protective cap. It is known to attach a protective cap to a burner cap by hooking a hooking claw provided on a foot portion onto a wire spring (see Patent Document 1 below).

  When the conventional configuration is adopted, the wire spring 24 is held at the back end of the holding groove 23 formed in the protrusion 22 of the burner cap 21 as shown in FIG. Then, when the latching claw 26 of the protective cap 25 is moved down adjacent to the projection 22, the wire spring 24 is made elastic by the inclined lower edge 26 a of the latching claw 26 as shown in FIG. The wire spring 24 is pushed against the movement and moves along the inclination of the lower inner edge 23 a of the holding groove 23. At this time, the wire spring 24 can be smoothly moved downward by the inclination of the lower edge 26 a of the latching claw 26 and the inclination of the lower inner edge 23 a of the holding groove 23.

  Subsequently, when the latching claw 26 is further lowered, the wire spring 24 gets over the tip of the latching claw 26 and further moves along the upper edge 26b extending in the horizontal direction of the latching claw 26, Return to the back end of the holding groove 23. As a result, as shown in FIG. 6C, the hooking claw 26 is hooked on the wire spring 24, and the attachment state of the protective cap 25 to the burner cap 21 is maintained.

  Thereby, attachment of the protective cap 25 to the burner cap 21 can be facilitated, and removal of the protective cap 25 from the burner cap 21 can be reliably prevented.

JP 2007-298248 A

  However, when the conventional configuration is adopted, as shown in FIG. 7A, even if the starting point P of the wire spring 24 at the tip of the latching claw 26 at the lowest position is small, If the wire spring 24 is positioned above the center point Q of the wire spring 24, the wire spring 24 may stay at that position without getting over the tip of the latching claw 26. In this case, the hooking claw 26 is not hooked on the wire spring 24, and the attachment state of the protective cap 25 to the burner cap 21 cannot be obtained.

  Therefore, as shown in FIG. 7B, the length L of the foot portion 27 is increased, whereby the starting point P of the wire spring 24 at the tip of the latching claw 26 is determined from the center point Q of the wire spring 24. Can also be positioned below. According to this, when the latching claw 26 comes to the lowest position, the wire spring 24 surely gets over the tip of the latching claw 26. However, since the length L of the foot portion 27 is increased, the distance between the upper edge 26b of the latching claw 26 and the upper inner edge 23b of the holding groove 23 is widened, and the latching claw 26 at the lowest position is located. A gap S is formed between the upper edge 26 b and the wire spring 24. For this reason, the protective cap 25 attached to the burner cap 21 is rattled, generating noise due to vibrations, and foreign matter may enter between the protective cap 25 and the protrusion 22.

  In addition, as shown in FIG. 7 (c), the top of the latching claw 26 can be used to smoothly move the tip of the latching claw 26 by the wire spring 24 when the latching claw 26 is lowered. It is conceivable to form the edge 26b in a shape that is inclined over its entire length. However, if the upper edge 26b of the latching claw 26 is inclined, the wire spring 24 is guided to the inclination of the upper edge 26b as the latching claw 26 moves upward, and the hooking claw 26 is moved to the line spring 24. The latch is easily released. Therefore, the latching claw 26 cannot exert a sufficient latching force on the wire spring 24 by the upper edge 26b of the latching claw 26, the backlash of the protective cap 25 may occur, or the protective cap may come off from the burner cap in some cases.

  In view of the above, an object of the present invention is to provide a gas burner that can be securely attached with a protective cap without backlash.

  The present invention is a gas burner in which a burner cap having a plurality of flame holes is provided on a burner head, and a protective cap is attached on the burner cap, wherein the burner cap is predetermined in the circumferential direction of the burner cap. A plurality of protrusions protruding upward at intervals, and a wire spring formed in an annular shape along the circumferential direction of the burner cap and elastically held in each protrusion in the radial direction The protrusion has a holding groove having a shape that is open at an inner edge facing the center side of the burner cap or an outer edge facing the outer side of the burner cap and is recessed so as to intersect the protruding direction of the protrusion, The wire spring is held by the holding groove, and the protective cap includes a cover plate that covers the burner cap, a plurality of feet that extend below the cover plate and are adjacent to the protrusions, Previously connected to the lower end A latching claw that protrudes toward the opening direction of the holding groove and latches on the wire spring held in the holding groove, and the latching claw moves into the holding groove when moved downward along the protrusion. In order to move the held wire spring against the elasticity from the back end of the holding groove toward the open end, the lower edge is formed in a shape inclined upward from the base end toward the tip end The holding groove includes an inclined edge portion, in which a lower inner edge to which the linear spring moving along the lower edge of the latching claw slides is inclined downward from the inner end of the lower inner edge, and the inclined edge portion. It is comprised by the horizontal edge part extended continuously and horizontally from the lower end of this.

  In the gas burner of the present invention, when the protective cap is attached on the burner cap, the foot of the protective cap is pushed down along the protrusion of the burner cap.

  When the foot part moves down along the protrusion, the wire spring held in the holding groove is pushed by the inclined lower edge of the latching claw, and smoothly slides downward while sliding on the inclined edge of the lower inner edge of the holding groove. Moving. When the hooking claw is further lowered, the wire spring is guided in the horizontal direction along the horizontal edge of the lower inner edge of the holding groove.

  At this time, the downward movement of the latching claw is allowed by the movement of the wire spring toward the open end of the holding groove along the horizontal edge, but the wire spring is further restricted from moving downward. On the other hand, the tip of the latching claw approaches the horizontal edge while the moving distance of the latching claw is relatively small. That is, the starting point of the wire spring at the tip of the latching claw can be positioned below the center point of the wire spring without difficulty. As a result, the wire spring whose downward movement is restricted by the horizontal edge easily gets over the tip of the approaching pawl.

  When the wire spring gets over the front end of the latching claw, the wire spring moves toward the back end of the holding groove with restoring elasticity, and at the same time, the latching claw is hooked on the wire spring at the back end of the holding groove. . As a result, it is possible to reliably prevent a situation in which the protection state of the protective cap to the burner cap becomes insufficient without the wire spring getting over the tip of the latching claw.

  In addition, since the lowering distance of the latching claw can be made relatively small, the gap formed between the upper edge of the latching claw and the upper inner edge of the holding groove can be made relatively narrow. Since it can be fitted without a gap, it is possible to prevent the protective cap from rattling against the burner cap.

  In the present invention, the holding groove has an upper inner edge that is inclined upward from the back end toward the open end, so that the holding groove is separated from the upper edge of the hooking claw in a state of being hooked on the wire spring. It is formed in a shape that gradually separates, and the wire spring is in contact with the upper inner edge of the holding groove and the upper edge of the latching claw at a position separated from the inner edge of the rear end of the holding groove. It is preferable to press the cover plate against the top of the protrusion.

  According to this, the urging force due to the elasticity of the wire spring contacting the upper inner edge of the holding groove and the upper edge of the latching claw is in a direction to separate the upper inner edge of the holding groove and the upper edge of the latching claw from each other. It acts and can reliably maintain the state in which the cover plate of the protective cap is pressed against the top of the protrusion, so that the backlash of the protective cap with respect to the burner cap can be more reliably prevented.

Explanatory sectional drawing which shows a part of structure of the gas burner of embodiment of this invention. The explanatory perspective view of the burner cap in this embodiment. Explanatory drawing which expands and shows the holding groove | channel in this embodiment. The perspective view which shows the protective cap in this embodiment from the bottom. Explanatory drawing which shows the attachment operation | work of the protective cap in this embodiment. Explanatory drawing which shows the attachment operation | work of the protective cap in the conventional gas burner. Explanatory drawing which shows the attachment state of the protective cap in the conventional gas burner.

  As shown in FIG. 1, the gas burner 1 of this embodiment includes a burner body 2, a burner cap 3, and a protective cap 4. The burner body 2 has a hollow mixing portion 5 that forms a mixed gas of gas fuel and primary air, and a burner head 6 having an annular space that is connected to the mixing portion 5 and distributes the mixed gas from the mixing portion 5. And. A burner cap 3 is attached to the upper part of the burner head 6, and a protective cap 4 is attached to the upper part of the burner cap 3.

  As shown in FIG. 2 with the protective cap 4 removed, the burner cap 3 is formed in a circular shape, and is formed with a central opening 7 that opens through the central portion in the vertical direction. The burner cap 3 has a plurality of flame holes 8 arranged in the circumferential direction.

  As shown in FIGS. 1 and 2, an ignition target 9 is formed on a part of the periphery of the burner cap 3 so as to project outward. As shown in FIG. 1, the ignition target 9 faces a spark plug 10 provided in the vicinity of the burner head 6 and forms a spark discharge for ignition with the spark plug 10.

  As shown in FIG. 2, a plurality of (three in this embodiment) first protrusions 11 are formed on the burner cap 3 so as to protrude upward from the burner cap 3 with a predetermined interval in the circumferential direction. Yes. On one side of each first protrusion 11, there is formed a second protrusion 12 that has a predetermined gap from each first protrusion 11 and protrudes at a height lower than each first protrusion 11. Each first protrusion 11 holds an annular wire spring 13 having elasticity in the diameter reducing direction.

  As shown in FIG. 2, each first protrusion 11 is formed with a holding groove 14 opened at the outer edge. Each holding groove 14 is formed in a shape that is opened at the outer edge of the first protrusion 11 and is recessed toward the inner edge, and accommodates and holds a part of the wire spring 13. In the present embodiment, three first protrusions 11 are provided, and holding grooves 14 having the same shape are formed in each first protrusion 11. The first protrusion 11 is in a state of being supported at three locations.

  Further, since the holding groove 14 is opened at the outer edge of the first protrusion 11, the wire spring 13 is mounted in the holding groove 14 from the outside of the first protrusion 11. As shown in FIG. 2, the wire spring 13 attached to the holding groove 14 has elasticity in the diameter reducing direction so as to be pressed against the inner edge 14a of the rear end of the holding groove 14, and the pressure contact state is maintained by elasticity. It is held in the holding groove 14.

  As shown in an enlarged view in FIG. 3, the holding groove 14 has an upper inner edge 14 b that is inclined upward toward the open end side. Further, an inclined edge portion 14d and a horizontal edge portion 14e are formed on the lower inner edge 14c of the holding groove 14 in order from the back end. The inclined edge portion 14d is inclined downward toward the horizontal edge portion 14e continuously with the inner edge 14a of the back end, and the horizontal edge portion 14e extends horizontally continuously with the inclined edge portion 14d to reach the open end.

  As shown in FIG. 2, the wire spring 13 has a discontinuous annular shape, that is, a substantially C shape, and has elasticity in the reduced diameter direction as described above. When attaching the wire springs 13 to the first protrusions 11 of the burner cap 3 or when removing the wire springs 13 from the first protrusions 11 during maintenance, the wire springs 13 are resisted against the elastic force by expanding both ends. The diameter can be easily expanded.

  As shown in FIGS. 1 and 4, the protective cap 4 includes a cover plate 15 that covers the upper portion of the burner cap 3, and a foot member 16 (foot portion) that is fixed to the lower surface of the cover plate 15 and extends below the cover plate 15. And the whole is covered with enamel. In addition, what is shown with the code | symbol 17 in a figure is a work holding piece for hold | maintaining when enamel coating is performed.

  As shown in FIG. 1, the cover plate 15 has a flat upper surface and an opening 18 formed in the center, and the lower surface abuts on the top of each first protrusion 11 of the burner cap 3. The opening 18 of the cover plate 15 is formed immediately above the central opening 7 of the burner cap 3 and opens the top of the central opening 7 so that a pan bottom temperature sensor (not shown) can pass therethrough. In addition, the cover plate 15 is formed with a tongue-shaped protrusion 19 projecting outward from a part of the outer peripheral edge. As shown in FIG. 1, the tongue-shaped protrusion 19 covers the ignition target 9 and the spark plug 10.

  As shown in FIG. 4, the foot member 16 is integrally connected to the periphery of the cover plate 15, and is disposed on the lower surface of the cover plate 15 when a predetermined range of the periphery of the cover plate 15 is folded back. . A latching claw 20 is connected to the lower end portion of the foot member 16. The latching claw 20 protrudes outward from the lower end portion of the foot member 16, and the protruding direction matches the direction in which the holding groove 14 is opened, as shown in FIG. The foot member 16 may be formed separately from the cover plate 15 and connected and fixed to the lower surface of the cover plate 15 by spot welding.

  As shown in FIG. 5A, the latching claw 20 has a lower edge 20a inclined upward from the base end 20b toward the front end 20c. The upper edge 20d of the latching claw 20 is substantially horizontal.

  Next, the operation of the latching claw 20 and the wire spring 13 when the protective cap 4 is attached to the burner cap 3 will be described. As shown in FIG. 5 (a), the leg member 16 is inserted between the first protrusion 11 and the second protrusion 12 through the cover plate 15 of the protective cap 4, and the wire spring 13 held in the holding groove 14. The lower edge 20a of the latching claw 20 comes into contact with the hook.

  When the foot member 16 is further lowered, the wire spring 13 held in the holding groove 14 is pushed down by the inclined lower edge 20a of the latching claw 20 and the holding groove 14 as shown in FIG. The diameter of the lower inner edge 14c is increased elastically while moving along the inclined edge part 14d.

  Further, when the wire spring 13 passes through the inclined edge portion 14d and abuts against the horizontal edge portion 14e, further lowering is restricted, and the wire spring 13 is guided outward in the horizontal direction by the horizontal edge portion 14e. It is spread in the horizontal direction by 20 inclined lower edges 20a.

  Then, as shown in FIG. 5C, the wire spring 13 elastically climbs over the tip 20 c of the latching claw 20 and extends along the upper edge 20 d of the latching claw 20 to the inner end 14 a of the rear end of the holding groove 14. Move towards. At this time, since the horizontal edge portion 14e is formed in the holding groove 14, for example, without increasing the length of the foot member 16, the starting point P of the wire spring 13 at the tip 20c of the latching claw 20 is determined. Since the wire spring 13 can be positioned below the center point Q of the wire spring 13, the wire spring 13 reliably gets over the tip 20 c of the hook claw 20 when the hooking claw 20 comes to the lowest position. Therefore, the latching claw 20 is smoothly latched to the wire spring 13, and the protective cap 4 can be securely attached to the burner cap 3 by being pushed down.

  Further, the linear spring 13 that has moved toward the inner edge 14a of the holding groove 14 along the upper edge 20d of the latching claw 20 is slightly spaced from the inner edge 14a of the holding groove 14 at a position slightly away from the holding groove 14. Between the upper inner edge 14b and the upper edge 20d of the latching claw 20.

  Since the wire spring 13 tends to reduce its diameter by elasticity until it makes contact with at least the inner edge 14a of the holding groove 14, it is sandwiched between the upper inner edge 14b of the holding groove 14 and the upper edge 20d of the latching claw 20. The wire spring 13 tries to descend along the upper inner edge 14b of the inclined holding groove 14, and thereby an urging force is generated in the direction of pressing the upper edge 20d of the latching claw 20 downward. With this urging force, the cover plate 15 of the protective cap 4 is pressed against the top of the first protrusion 11, and the burner cap 3 is prevented from being loosened due to the rising of the protective cap 4. Further, since the foot member 16 of the protective cap 4 is sandwiched between the first protrusion 11 and the second protrusion 12, the rotation of the protective cap 4 with respect to the burner cap 3 is also prevented.

  In addition, in the gas burner 1 of this embodiment, although the wire spring 13 which has elasticity in the diameter reducing direction was shown to be mounted in the holding groove 14 from the outside of the first protrusion 11, it is not limited thereto. Although not shown, the holding groove is formed so as to be released at the inner edge of the protrusion, the wire spring having elasticity in the diameter expansion direction is held by the holding groove, and the latching claw of the foot member protrudes outward Can also be adopted.

  The second protrusions 12 may not be provided adjacent to all the first protrusions 11, and may be provided adjacent to at least one first protrusion 11.

  Further, in the present embodiment, the substantially C-shaped wire spring 13 which is partially discontinuous is adopted, but the other wire springs are not illustrated, but are partially discontinuous annular and not suitable. It is possible to adopt one that allows the outer diameter to be elastically reduced in a state where the continuous portions overlap each other, or one that is a continuous annular shape that elastically bends in the radial direction.

  DESCRIPTION OF SYMBOLS 1 ... Gas burner, 3 ... Burner cap, 4 ... Protective cap, 6 ... Burner head, 8 ... Flame hole, 11 ... 1st protrusion (protrusion), 13 ... Wire spring, 14 ... Holding groove, 14a ... Back end inner edge, 14b ... Upper inner edge, 14c ... Lower inner edge, 14d ... Inclined edge, 14e ... Horizontal edge, 15 ... Cover plate, 16 ... Foot member (foot part), 20 ... Hook nail, 20a ... Lower edge, 20d ... Upper edge .

Claims (2)

A gas burner in which a burner cap having a plurality of flame holes is provided on a burner head, and a protective cap is attached on the burner cap,
The burner cap is formed annularly along the circumferential direction of the burner cap with a plurality of protrusions protruding upward at a predetermined interval in the circumferential direction of the burner cap, and has elasticity in its radial direction. And wire springs elastically held on each protrusion,
The protrusion includes a holding groove having a shape that is open at an inner edge facing the center side of the burner cap or an outer edge facing the outer side of the burner cap and is recessed so as to intersect the protruding direction of the protrusion. Holding the wire spring,
The protective cap includes a cover plate that covers the burner cap, a plurality of feet that extend below the cover plate and are adjacent to the protrusions, and a lower end of the foot that is connected to the bottom of the holding groove. A latching claw projecting toward the opening direction and latching on the wire spring held in the holding groove;
The latching claw has a lower edge to move the wire spring held in the holding groove from the back end of the holding groove toward the open end against its elasticity when moved downward along the protrusion. In what is formed in a shape inclined upward from the proximal end toward the distal end,
The holding groove includes an inclined edge portion in which a lower inner edge with which the linear spring moving along the lower edge of the latching claw slides is inclined downward from the inner end of the lower inner edge, and A gas burner comprising a horizontal edge portion extending continuously and horizontally from the lower end. The holding groove has a shape in which the upper inner edge of the holding groove is gradually separated from the upper edge of the hooking claw in a state of being hooked on the wire spring by inclining upward from the back end toward the open end. Formed,
The wire spring is in contact with the upper inner edge of the holding groove and the upper edge of the latching claw at a position spaced from the inner edge of the holding groove, and presses the cover plate of the protective cap against the top of the protrusion. The gas burner according to claim 1.

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