Pressure cooker

Abstract

To provide a pressure cooker capable of reducing the occurrence of half locking of a lid.SOLUTION: A pressure cooker 10 comprises: a lid 30 which covers a cooker body 20 in an openable and closable manner, a rear end of the lid being rotatably attached to the cooker body; lid energization means which energizes the lid in a direction of opening; and a locking mechanism 41 which can hold the lid on the cooking device body in a closed state. The locking mechanism comprises: a latch lever 50 which has a latch lever plate 52 supported by the lid so as to rock backward and forward, and latch pawls 53 projecting backward from a lower end of the latch lever plate; latch lever energization means which energizes the latch pawls backward; latch receivers 62 which are provided on the cooker body and receive the latch pawls; and latch receiving surfaces 60 defining an upper face of the latch receivers. A tip 53a of each latch pawl has an arc shape such that an extension width from the latch lever plate is longest in its center portion and gradually shortens to the right and left sides of the center portion.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a pressure cooker capable of cooking in a pressure mode, and to a pressure cooker capable of preventing the lid from being locked halfway through operation. [Background technology]

[0002] 2. Description of the Related Art In pressure cookers such as pressure jar rice cookers and electric pressure cookers, a lid is used to cover an inner pot housed in a cooking device body, and the inside of the inner pot is pressurized for cooking rice or other heat-generating food.

[0003] The rear of the lid is pivotally hinged to the cooking appliance body and biased in the open direction. The lid can be locked in the closed position on the cooking appliance body by a locking mechanism, and the lid can be opened by releasing the locking mechanism.

[0004] The locking mechanism includes a latch pawl provided on the front side of the lid and a latch receiver provided on the cooking appliance body into which the latch pawl fits (see, for example, Patent Document 1). The latch pawl is formed to protrude rearward from the lower edge of a latch lever provided on the lid so that it can swing back and forth, and the latch lever has a biasing means that biases the latch pawl rearward. When the front side of the lid is pressed downward to close it, the latch pawl is first swung forward by a guide plate provided above the latch receiver that is inclined diagonally downward and forward, and then the latch pawl fits into the latch receiver, completing the locking process. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5648657 Summary of the Invention [Problem to be solved by the invention]

[0006] When intentionally pushing the lid at an angle to close it, the latch claw may not fit properly into the latch receiver, resulting in a semi-locked state. Specifically, as shown in Figure 12(b), the tip 53c of the latch claw 53 is partially engaged (reference numeral 53d) with the latch receiver surface 60 that forms the upper surface of the latch receiver. If pressure cooking is performed in this semi-locked state, the lock may be released unintentionally and the lid may open when the pressure inside the inner pot increases.

[0007] An object of the present invention is to provide a pressure cooker that can reduce the occurrence of half-locking of the lid. [Means for solving the problem]

[0008] The pressure cooker of the present invention comprises: a cooking appliance body that houses the inner pot; a cover that covers the cooking appliance body in an openable and closable manner and has a rear end that is rotatably attached to the cooking appliance body; a lid biasing means for biasing the lid in an opening direction; a locking mechanism that can hold the lid body in a closed state on the cooking appliance body; Equipped with The locking mechanism is a latch lever having a latch lever plate supported on the cover body so as to be swingable back and forth, and a latch claw protruding rearward from a lower end of the latch lever plate; a latch lever biasing means for biasing the latch pawl rearward; a latch receiver provided on the cooking appliance body and into which the latch claw fits; a latch receiving surface that constitutes an upper surface of the latch receiving; A pressure cooker having The tip of the latch pawl has an arc shape such that the width of the tip extending from the latch lever plate is greatest at the center and gradually decreases on both sides of the center.

[0009] The tip of the latch claw is preferably arc-shaped with a radius of curvature R1 except for the left and right corners, and the corners are preferably arc-shaped with a radius of curvature R2 smaller than the radius of curvature R1.

[0010] It is desirable that the front end of the latch receiving surface, which is the side where the latch claw enters, has a straight shape with the same projection width in the front-rear direction.

[0011] The latch lever plate is preferably pivotally supported on the cover at a position higher than the latch claw.

[0012] The latch lever has one latch claw on each side, The latch receivers can be disposed one on each side of the cover.

[0013] The cooker body can be configured such that guide surfaces that slope diagonally downward toward the front are formed on the upper sides of the left and right latch receivers, and guide members are protruded from the guide surfaces at positions shifted outward from the transition path through which the latch claws pass. [Effects of the Invention]

[0014] According to the pressure cooker of the present invention, the latch claw has an arc-shaped tip, so that when the latch claw tries to enter the latch receiver at an angle, such as when the lid is intentionally pushed diagonally while being closed, the latch claw does not get caught on the latch receiver surface. Therefore, the lid opens due to the bias, so a half-lock does not occur, and pressure cooking does not occur in a half-locked state. Furthermore, even if the latch claw gets caught on the latch receiver surface in a half-locked state, the arc-shaped tip of the latch claw slides over the tip of the latch receiver surface, and the latch claw disengages from the latch receiver. This prevents the half-locked state from occurring. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of an electric pressure cooker according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the electric pressure cooker with the lid open. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 and seen in the direction of the arrow. [Figure 4] 4 is an enlarged cross-sectional view taken along line BB in FIG. 1 and seen in the direction of the arrow. [Figure 5] FIG. 5 is a perspective view showing the upper frame of the pressure cooker body and the latch lever provided on the lid. [Figure 6] FIG. 6 is a front view of FIG. [Figure 7] FIG. 7 is an exploded view including the locking mechanism, the upper frame of the pressure cooker body, and the lid frame. [Figure 8] FIG. 8 is a perspective view of the latch lever. [Figure 9] FIG. 9 is a perspective view of the latch lever as seen obliquely from below. [Figure 10] FIG. 10 is a bottom view of the latch lever. [Figure 11] FIG. 11 is a perspective view of the latch receiving plate. [Figure 12] FIG. 12 shows (a) the state of the latch claw and latch receiving surface of the present invention when the cover is closed at an angle, and (b) the state of the conventional latch claw and latch receiving surface in a semi-locked state. [Figure 13] FIG. 13 is a diagram showing a state in which the latch claw and the latch receiving surface are properly engaged with each other. [Figure 14] FIG. 14 is a diagram showing the latch claw and the guide rail, showing (a) the state in which the latch claw is in contact with the guide surface without tilting, and (b) the state in which the latch claw is in contact with the guide member at an angle. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following describes an embodiment in which the pressure cooker is applied to a heating and pressurizing type cooker (electric pressure cooker 10), but examples of pressure cookers or heating and pressurizing cookers include kitchen appliances such as pressure rice cookers, thermal retaining kettles, thermal retaining kettles, soup jars, food processors, mixers, blenders, electric kettles, and electric kettles.

[0017] FIG. 1 is a perspective view of an electric pressure cooker 10 (hereinafter referred to as "pressure cooker") according to one embodiment of the present invention with the lid 30 closed, FIG. 2 is a right side view showing the lid 30 in a half-open state, and FIGS. 3 and 4 are cross-sectional views along lines AA and BB in FIG. 1, respectively.

[0018] The pressure cooker 10 is constructed by opening and closing a lid 30 attached to the top of a pressure cooker body 20, which is the cooking appliance main body. The exterior of the pressure cooker body 20 is covered by an exterior casing 21, and inside is provided a bowl-shaped recessed protective frame 22 (Fig. 3) and a shoulder case 25 that surrounds the outer periphery of the top surface of the protective frame 22. The protective frame 22 detachably houses the inner pot 11 shown in Fig. 2. The inner pot 11 is a container into which ingredients are placed and cooked.

[0019] Inside the pressure cooker body 20, a heater 23 for heating is installed on the outer periphery of the protective frame 22, or on the bottom surface of the protective frame 22 in Figure 3, and by operating a switch 24, which is a dial type in the figure, the inner pot 11 can be heated to cook ingredients or keep them warm.

[0020] As shown in Figure 3, the lid 30 is rotatably supported at the rear end of the pressure cooker body 20 by a hinge mechanism 12, and closes the pressure cooker body 20 during cooking. The lid 30 is constantly biased in the opening direction relative to the pressure cooker body 20 by a lid biasing means (not shown), such as a coil spring.

[0021] The exterior of the lid 30 is covered by a lid cover 31, and has a pressurizing mechanism 36 inside to enable pressurization of the inner pot 11. The pressurizing mechanism 36 has a steam passage 36a in the lid 30 that connects the inner pot 11 to the outside, and a pressure valve 36c that blocks the steam passage 36a to keep the inside of the inner pot 11 airtight.

[0022] 1, steam passage 36a opens at steam hole 36b formed on the upper surface of lid body 30. A removable inner lid 35 is attached to the lower surface of lid body 30, and steam passage 36a opens at inner lid 35.

[0023] The pressure valve 36c is located on the underside of the inner lid 35 and can open and close the steam passage 36a. The illustrated pressure valve 36c opens and closes the steam passage 36a in response to the operation of a pressure operation button 36d protruding from the top surface of the lid 30. For example, as shown in FIG. 2, the pressure valve 36c can be attached to the underside of the inner lid 35 and configured to block the steam passage 36a from below. The pressure operation button 36d can have a knock cam structure, so that pressing the pressure operation button 36d once closes the pressure valve 36c and pressing it again opens the pressure valve 36c. When performing pressure cooking, the user simply operates the pressure operation button 36d to close the pressure valve 36c, creating an airtight state inside the inner pot 11, and then performs heating. After cooking is complete, before opening the lid 30, the user can again operate the pressure valve 36c to release the pressure inside the inner pot 11 and open the lid 30.

[0024] The pressure mechanism 36 is not limited to the above configuration and may be an electric type that uses a solenoid, etc. Furthermore, the operating direction of the pressure valve 36c and the operating method of the pressure operation button 36d are not limited to those described above.

[0025] The lid 30 can be opened and closed by a lid opening / closing means 40 including an operating unit 70 and a locking mechanism 41.

[0026] The operating unit 70 is operated by the user when opening the lid 30. In this embodiment, the operating unit is pushed in and slid toward the rear of the lid 30 to release the locking mechanism 41. Of course, the locking mechanism 41 may be released by pushing the operating unit 70 downward or by pulling it upward.

[0027] The front end of the operating unit 70 protrudes from the lid cover 31 and is biased forward by an operating unit biasing means (not shown). A push piece 71 that operates the locking mechanism 41 inside the lid cover 31 is formed at the rear end of the operating unit 70. The push piece 71 pushes and operates the latch lever 50 (see FIG. 5, etc.) of the locking mechanism 41.

[0028] The locking mechanism 41 includes a latch lever 50 provided on the lid 30 and a latch receiver 62 provided on the pressure cooker body 20. Figures 4 to 7 are cross-sectional or exploded views of the locking mechanism 41, Figures 8 to 10 are views showing the latch lever 50, and Figure 11 is a view showing a latch receiver plate 61 including a latch receiver surface 60 that forms the upper surface of the latch receiver 62.

[0029] The latch lever 50 is a metal member disposed behind the operating unit 70 and tilts forward and backward when pushed by a push piece 71 of the operating unit 70. The latch lever 50 has a contact portion 51 (FIGS. 5 to 10) that protrudes into the slide path of the push piece 71 of the operating unit 70 and is pushed by the push piece 71 to tilt the latch lever 50. A latch lever plate 52 is formed below the contact portion 51, continuing from the contact portion 51 and extending left and right, and a pivot support hole 52a is opened on each of the left and right sides of the latch lever plate 52. The lower side of the latch lever plate 52 branches left and right and extends downward, with a latch claw 53 bent rearward at each end of the branch. The shape of the latch claw 53 will be described later.

[0030] The latch lever 50 is aligned with a pivot support hole 33a of the cover frame 32 of the cover 30 (described below) and is pivotally supported by a support shaft (not shown) so as to be tiltable back and forth. When pivotally supported, the latch lever 50 is positioned so that the abutment portion 51 is located on the sliding path of the push piece 71 of the operating part 70, as shown in FIG. 3, and the latch pawl 53 protrudes from the lower front side of the cover 30, as shown in FIG. 2. The latch lever 50 is constantly biased in the direction in which the latch pawl 53 faces rearward by a latch lever biasing means (not shown). In an unloaded state, i.e., when the operating part 70 is not being pressed, the latch lever 50 is maintained within the cover 30 in an orientation in which the abutment portion 51 abuts the push piece 71 of the operating part 70, the latch lever plate 52 is approximately vertical, and the latch pawl 53 is approximately horizontal.

[0031] The lid 30 in which the latch lever 50 is disposed has a lid frame 32 as shown in Figure 7 within the lid cover 31, and the latch lever 50 is pivotally supported by the lid frame 32. The illustrated lid frame 32 has two parallel support rods 33, 33 connected near their front ends by a reinforcing rod 34. Each of the support rods 33, 33 has a pivotal support hole 33a formed at its front end for pivotally supporting the latch lever 50 by a support shaft (not shown), and a hinge shaft hole 33b formed at its rear end for pivotally supporting the hinge mechanism 12. By making the lid frame 32 out of metal, the lid frame 32 can be provided with rigidity.

[0032] The pressure cooker body 20 is provided with a latch receiver 62 on the shoulder case 25, with which the latch pawl 53 of the latch lever 50 can engage. The latch receiver 62 has a latch receiving surface 60 on its upper surface, where the latch pawl 53 abuts. Because the latch receiving surface 60 must be strong and rigid to prevent the lid 30 from opening, in this embodiment, the latch receiving surface 60 is constructed of a metal latch receiving plate 61. As shown in FIGS. 6 and 11 , the latch receiving plate 61 is a plate extending laterally, with the left and right lower surfaces of its front end serving as the latch receiving surfaces 60 that engage with the latch pawls 53. The latch receiving surface 60 has a straight shape with the same projection width in the front-to-rear direction. The latch receiving plate 61 is attached to the front end of the shoulder case 25, and the latch pawl 53 slips under the latch receiving surface 60 as shown in FIG. 2 to engage with the latch receiver 62.

[0033] The latch lever 50 is biased by a latch lever biasing means so that the latch pawl 53 is in a substantially horizontal position. Therefore, to engage the latch pawl 53 with the latch receiver 62, the latch pawl 53 must be tilted forward against the biasing force and overcome the latch receiver surface 60. Therefore, as shown in Figures 2, 4, and 5, a guide plate 63 that guides the latch pawl 53 into the latch receiver 62 is disposed above the latch receiver surface 60. The guide plate 63 has a guide surface 64 along which the latch pawl 53 slides. The guide surface 64 is inclined diagonally forward from the position where the tip 53a of the latch pawl 53 contacts when the lid 30 moves from an open state toward the pressure cooker body 20 in the closing direction, and its lower end extends to a position aligned with the latch receiver plate 61. When the lid 30 is closed, the tip 53a of the latch pawl 53 slides against the guide surface 64, gradually pushing the latch pawl 53 forward and rotating the latch lever 50. Then, the latch claw 53 climbs over the latch receiving surface 60 and fits into the latch receiving surface 62 .

[0034] In a pressure cooker 10 having the locking mechanism 41 configured as described above, when the lid 30 is closed, the latch claw 53 engages with the latch receiver 62, preventing the lid 30 from opening. To open the lid 30 from this state, the user first pushes the operating unit 70. When the operating unit 70 is pushed against the biasing force of the operating unit biasing means, the pushing piece 71 pushes the contact portion 51 of the latch lever 50 rearward. As a result, the latch lever 50 tilts around the pivot hole 52a against the biasing force of the latch lever biasing means, with the contact portion 51 moving rearward and the latch claw 53 moving forward. The latch claw 53 is then pulled out of the latch receiver 62, and the engagement between the latch claw 53 and the latch receiver surface 60 is released. Because the lid 30 is biased in the opening direction by the lid biasing means, the lid 30 rotates in the opening direction and opens when the engagement between the latch claw 53 and the latch receiver surface 60 is released.

[0035] To close the lid 30, with the lid 30 in an open position, the user pushes the front end of the lid 30 downward while pulling it toward themselves. This causes the lid 30 to tilt forward against the biasing force of the lid biasing means, bringing the lid 30 closer to the pressure cooker body 20. Further tilting of the lid 30 forward causes the latch pawl 53 to abut against the guide surface 64. As shown in FIG. 4 and other figures, the guide surface 64 is inclined diagonally forward. Therefore, when the latch pawl 53 abuts against the guide surface 64, it is gradually pushed against the guide surface 64 and moves downward, sliding against the guide surface 64. This causes the latch lever 50 to tilt diagonally forward relative to the latch lever 50 within the lid 30, against the force of the latch lever biasing means, and the latch pawl 53 clears the latch receiving surface 60. When the latch claw 53 overcomes the latch receiving surface 60, the latch lever 50 tilts backward within the lid 30 due to the biasing force of the latch lever biasing means, and the latch claw 53 fits into the latch receiver 62, completing the locking, and the lid 30 closes the pressure cooker body 20. Because the latch claw 53 is engaged with the latch receiving surface 60, the lid 30 will not open.

[0036] In the case of the pressure cooker 10, the pressurizing mechanism 36 is operated to heat the inner pot 11 in an airtight manner, thereby pressurizing the inner pot 11 and performing pressurized cooking. At this time, the latch claw 53 of the lid 30 is properly fitted into the latch receiver 62, and the latch claw 53 is prevented from moving upward by the latch receiver surface 60. Therefore, the lid 30 does not open even when the inner pot 11 is pressurized.

[0037] However, if the user intentionally closes the lid 30 while pushing it diagonally, the latch claw 53 will diagonally engage with the latch receiver 62. Figure 12(b) shows an example in which the tip (reference symbol 53c) of the latch claw 53 is straight in the left-right direction, as in the conventional case. When the tip 53c of the latch claw 53 is straight, the latch claw 53 may enter a partially engaged state (referred to as a semi-locked state) in which only the corner of the latch claw 53 is shallowly engaged with the latch receiver surface 60 (reference symbol 53d). In this semi-locked state, the lid 30 appears to be unable to open. That is, the lid 30 is biased in the opening direction by the lid biasing means, but even in the semi-locked state, the lid 30 rarely opens due to the biasing force of the lid biasing means. However, when the pressure inside the inner pot 11 increases due to pressure-cooking as described above, the lid 30 is pushed by this pressure, causing the latch claw 53 to disengage from the latch receiver surface 60, resulting in the lid 30 opening.

[0038] Therefore, in the present invention, the shape of the locking mechanism 41 has been devised to prevent the above-mentioned half-locked state from occurring. Specifically, as shown in Figures 9 and 10, the latch claw 53 has a tip 53a that is arc-shaped when viewed from above. That is, the tip 53a of the latch claw 53 projects from the latch lever plate 52 in such a way that the length is greatest at the center and gradually decreases toward the left and right.

[0039] More specifically, tip 53a of latch claw 53 has an arc shape with a radius of curvature R1 except for corners 53b, 53b, and left and right corners 53b, 53b have a radius of curvature R2 that is smaller than radius of curvature R1. When the width of latch claw 53 in the left-right direction is 15 mm to 25 mm, radius of curvature R1 is preferably 20 mm to 40 mm and radius of curvature R2 is 1 mm to 4 mm. Of course, tip 53a may be elliptical rather than arc-shaped.

[0040] By configuring the tip 53a of the latch claw 53 in the above-described shape, when the user closes the lid 30 while intentionally pressing it obliquely, the following occurs.

[0041] As in FIG. 12(b), the latch claw 53 attempts to enter the latch receiver 62 at an angle. However, because the tip 53a of the latch claw 53 is arc-shaped, the latch claw 53 does not get caught on the latch receiver surface 60, as shown in FIG. 12(a). For this reason, half-locking or half-hooking is unlikely to occur, and the latch claw 53 does not lock on the latch receiver surface 60. Furthermore, because the corner 53b of the latch claw 53 is also arc-shaped, the corner 53b does not get caught on the latch receiver surface 60 either. Therefore, when the user releases their hand from the lid 30, the lid 30 opens due to the biasing force of the lid biasing means.

[0042] Even if the latch claw 53 is partially engaged with the latch receiving surface 60, the tip 53a of the latch claw 53 is arc-shaped, so it is pulled by the biasing force in the opening direction of the lid body 30, sliding along the tip of the straight-shaped latch receiving surface 60, causing the latch claw 53 to disengage from the latch receiving surface 60 and allowing the lid body 30 to open.

[0043] 13 shows the locked state in which the latch claw 53 is properly engaged with the latch receiving surface 60.

[0044] In the present invention, the lid 30 is not closed in a semi-locked state, so that the lid 30 will not accidentally open when pressure cooking or pressure-heat cooking is performed.

[0045] Even if the cover 30 is intentionally closed at an angle, it is desirable to correct the latch claw 53 itself from entering the latch receiver 62 at an angle. Therefore, in the present invention, as shown in Figures 2, 3 and 6, the guide plate 63 is provided with a guide member 65 on a guide surface 64 with which the latch claw 53 slides, for correcting the direction in which the latch claw 53 enters.

[0046] The guide members 65 are formed diagonally downward and forward outside the transfer paths of the left and right latch claws 53. For example, the guide members 65 are ribs protruding from the guide surface 64. As shown in FIG. 14(a), the guide members 65 are formed at a position and height such that they do not come into contact with the latch claws (reference numeral 54) when the lid 30 is closed without tilting at an angle, or if they do come into contact, the corners 53b slide against them, and as shown in FIG. 14(b), they are formed at a position and height such that they come into contact with the latch claws 53 (reference numeral 54a) when the lid 30 is closed with an oblique tilt.

[0047] Therefore, when the cover 30 is intentionally closed at an angle, as shown in FIG. 14(b), the latch claw 53 (54a) approaches the guide surface 64 in an inclined state, but the arc-shaped tip 53a hits the guide member 65. Because the tip 63a of the latch claw 53 (54a) is arc-shaped, when it hits the guide member 65, it receives a force in a direction (arrow C) that corrects the inclination. This corrects the inclination of the latch claw 53, and the inclination of the cover 30 is also corrected, and the cover 30 returns to the correct direction. This prevents the latch claw 53 from entering the latch receiver 62 at an angle, and prevents the cover 30 from being partially locked or partially latched.

[0048] The above description is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims or narrowing its scope. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims. [Explanation of symbols]

[0049] 10 Cooking appliance (electric pressure cooker) 11 Inner pot 20 Cooking appliance body (pressure cooker body) 30 Lid 41 Locking mechanism 50 Latch lever 52 Latch lever plate 53 Latch claw 53a Tip 53b Corner 60 Latch receiving surface 61 Latch receiving plate 62 Latch receiver 63 Guide plate 63a Tip 64 Guide surface 65 Guide member

Claims

1. a cooking appliance body that houses the inner pot; a cover that covers the cooking appliance body in an openable and closable manner and has a rear end that is rotatably attached to the cooking appliance body; a lid biasing means for biasing the lid in an opening direction; a locking mechanism that can hold the lid body in a closed state on the cooking appliance body; Equipped with The locking mechanism is a latch lever having a latch lever plate supported on the cover body so as to be swingable back and forth, and a latch claw protruding rearward from a lower end of the latch lever plate; a latch lever biasing means for biasing the latch pawl rearward; a latch receiver provided on the cooking appliance body and into which the latch claw fits; a latch receiving surface that constitutes an upper surface of the latch receiving; A pressure cooker having The tip of the latch claw has an arc shape in which the projection width from the latch lever plate is the longest at the center and gradually becomes shorter on both sides of the center. Pressure cooker.

2. The tip of the latch claw has an arc shape with a curvature radius R1 except for the left and right corners, and the corners have an arc shape with a curvature radius R2 smaller than the curvature radius R1. The pressure cooker of claim 1.

3. The latch receiving surface has a straight shape with a front end, which is the side where the latch claw enters, having the same projection width in the front-rear direction. The pressure cooker according to claim 2.

4. The latch lever plate is pivotally supported on the cover body at a position higher than the latch claw. The pressure cooker according to claim 3.

5. The latch lever has one latch claw on each side, The latch receivers are arranged one on each side of the lid body. The pressure cooker according to claim 4.

6. The cooker body has guide surfaces formed on the upper sides of the left and right latch receivers that are inclined downward and forward, and guide members are protruding from the guide surfaces at positions shifted outward from the transition path through which the latch claws pass. The pressure cooker according to claim 5.

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