JP4436889B2 - bottle opener - Google Patents

Description

  The present invention relates to a bottle opener for removing a crown of a bottle.

When removing a bottle crown with a bottle opener, the bottle mouth may be damaged, and it may be dangerous because the finger may be damaged at the damaged part, or a piece of glass may enter the bottle. There is a problem that can not be used as.
A bottle opener that does not easily damage the bottle opening is disclosed in, for example, the following patent document.
Japanese Utility Model Publication No. 4-135494 Japanese Utility Model Publication No. 56-38093 Japanese Utility Model Publication No. 58-143392

In the techniques disclosed in Patent Documents 1 and 2, engaging claws that engage with the lower end of the crown peripheral wall portion at the time of opening are provided on both sides excluding the center portion of the opening, and the center portion is bottled at the time of opening operation. It is designed not to touch the mouth.
In the technique disclosed in Patent Document 3, a tooth (engaging claw) that engages with the lower end of the crown peripheral wall at the time of opening is provided at the center of the opening, and a stepped shoulder is formed at the base of the tooth. The tooth is prevented from moving to the bottle side during the opening operation by preventing the tooth from coming into contact with the bottle mouth.

In the bottle openers of Patent Documents 1 and 2, since the engaging claws are provided on both sides of the center of the opening, the contact portion between the engaging claws and the crown peripheral wall portion becomes small at the time of opening, and the crown peripheral wall portion The pleats may be deformed and cannot be opened, and in that case, the engaging claw is inserted deeper into the lower end of the crown peripheral wall to perform the opening operation, so that the engaging claw eventually comes into contact with the bottle mouth, May damage the bottle.
In the bottle opener of Patent Document 3, the teeth (engaging claws) are provided only at the center of the opening, and the shoulders are in contact with the crown peripheral wall. In some cases, the folds of the crown wall may be deformed and cannot be opened.In this case, the shoulder will not contact the crown wall due to the deformation of the folds, and the teeth will be inserted deeper into the lower end of the crown wall. By performing the opening operation at, the engaging claw may eventually come into contact with the bottle mouth and damage the bottle.
In addition, since the shoulder part is a straight line in plan view, there are few contact parts between the shoulder part and the crown peripheral wall part.When the shoulder part is pressed against the folds on the crown peripheral wall part when opening, the folds deform and the engaging claws are bottled. There is a risk of touching the mouth and damaging the bottle.

This kind of bottle opener usually has an engaging claw on the rear end side of the inner peripheral edge of the opening engaged with the lower end of the crown peripheral wall portion as an action point, and the tip side of the inner peripheral edge of the opening is brought into contact with the crown top surface. With this as a fulcrum, the handle is rotated upward to open the plug (this opening method is referred to as a “normal operation opening method” for convenience).
However, when the condition of the bottle mouth being damaged during opening was examined, the tip side of the inner peripheral edge of the opening was engaged with the lower end of the crown peripheral wall, and this was used as the point of action, and the rear end side of the inner peripheral edge of the opening was the crown top surface. The bottle mouth is damaged when the plug opening method (this method is called "reverse action opening method" for convenience) is used. It turned out to be easy.
This is because, as shown in FIG. 7, when the handle is rotated downward, a horizontal component force F that moves the bottle opener (inner edge of the opening on the front end side) in the bottle direction is generated, and the bottle opener moves in the bottle direction. This makes it easier for the inner periphery of the opening on the tip side to come into contact with the bottle mouth, and the action of turning downwards, such as hitting the handle with the palm of the hand, is easy to apply force, and the impact when the inner periphery of the opening touches the bottle mouth increases. This is the cause.
In this reverse operation opening method, there are many bottle openers that are not assumed as regular opening methods. However, it is preferred when opening a beer bottle at a restaurant, etc., because it makes a flashing sound like a “pong”, and it is convenient for opening a bottle in a case. It is not uncommon to adopt a reverse opening method.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bottle opener that is less likely to damage the bottle opening and easy to open, regardless of whether the user uses the opening method of the normal operation or the reverse operation. To do.

[Claim 1]
Further, the present invention is a bottle opener having a crown opening portion provided with an opening at the tip of the handle,
An engagement claw is provided on the inner peripheral edge on the front end side and rear end side of the opening,
The engaging claw has a tapered shape in which the tip shape in plan view is a concave curve shape, and the cross-sectional shape is cut out in a triangular shape on both the front and back sides,
Concave and convex portions are formed on the inner peripheral surface on the outer side of both ends in the circumferential direction of the engaging claw,
When opening the cap, the crown top surface and / or the peripheral wall portion is in contact with the uneven portion.
Note that the concavo-convex part may be only a concave part or only a convex part, and both the concave part and the convex part may be formed.

In both of the forward opening method and the reverse opening method, the crown top surface and / or the peripheral wall part contacts the uneven part when opening, so that the crown deforms with the opening operation and the uneven part. Bites into the crown surface and / or the peripheral wall, making it difficult for the bottle opener to move in the bottle direction and preventing the engaging claw from contacting the bottle mouth.
In addition, since the front end shape of the engaging claw is a concave curve shape, the contact portion between the engaging claw and the lower end of the crown peripheral wall portion is increased, and there is less deformation of the folds on the crown peripheral wall portion when opening the plug. It becomes easy.

[Claim 2]
Moreover, this invention is a bottle opener of Claim 1 in which the front and back of the said engaging claw are rough surfaces.

When opening, the rough surface of the engaging claw comes into contact with the lower end of the peripheral wall of the crown and the top surface, so the bottle opener is difficult to move in the bottle direction with the opening operation, and the engaging claw comes into contact with the bottle mouth. Is prevented.
In addition, since the front end shape of the engaging claw is a concave curve shape, the contact portion between the engaging claw and the lower end of the crown peripheral wall portion is increased, and there is less deformation of the folds on the crown peripheral wall portion when opening the plug. It becomes easy.

  The rough surface of the engaging claw and the uneven part are combined, and in both the forward opening method and the reverse opening method, the bottle opener is difficult to move in the bottle direction with the opening operation. The nail is prevented from touching the bottle mouth.

[Claim 3]
Moreover, this invention is a bottle opener of Claim 1 or 2 whose top view shape of the said engagement nail | claw is a concave curve with a curvature radius of 22-27 mm.

  By setting the radius of curvature of the engaging claw to 22 to 27 mm, the engaging claw can be brought into contact with the lower ends of the three or four pleat convex portions of the crown peripheral wall portion, and the opening operation becomes extremely easy.

[Claim 4]
Further, the present invention is a bottle opener having a crown opening portion provided with an opening at the tip of the handle,
Provided with engaging claws thinner than the periphery on the inner peripheral edge on the front end side and rear end side of the opening,
The engaging claw has a concave curved shape at the distal end in a plan view, and a stepped portion having a concave curved shape in a planar view is formed on the proximal end side of the engaging claw. When engaged, the stepped portion contacts the lower end of the crown peripheral wall,
A bottle opener characterized in that a concave-convex portion is formed on the inner peripheral surface outside the both circumferential ends of the engaging claw, and the crown top surface and / or the peripheral wall portion contacts the concave-convex portion when the cap is opened. .

In both the forward opening method and the reverse opening method, the stepped part contacts the crown wall when opening, so the bottle opener is difficult to move in the bottle direction with the opening operation. Is prevented from touching the mouth of the bottle.
Since the front end shape of the engaging claw is a concave curve, the contact portion between the engaging claw and the lower end of the crown peripheral wall portion is increased, and there is less deformation of the folds on the crown peripheral wall portion at the time of opening, and the opening operation is easy. Become.
In addition, since the stepped portion has a concave curved shape in plan view, the contact portion between the stepped portion and the crown fold increases when opening, and even if the stepped portion is strongly pressed against the fold, the folds are not easily deformed, and the engaging claw is on the bottle side. Since it is difficult to move, it is prevented that the engaging claw contacts the bottle mouth and the bottle mouth is damaged.

  Further, in both the forward opening method and the reverse opening method, the crown top surface and / or the peripheral wall portion comes into contact with the uneven portion, so that the bottle opener moves in the bottle direction with the opening operation. It is difficult to prevent the engaging claw from contacting the bottle mouth.

[Claim 5]
Moreover, this invention is a bottle opener of Claim 4 which formed the inclined surface which becomes a downward inclination toward the said opening in the outer peripheral area | region of the said engagement nail | claw.

[Claim 6]
Moreover, this invention is a bottle opener of Claim 5 whose said inclined surface is a rough surface.

  By providing the inclined surface, the inclined surface comes into contact with the crown top surface in accordance with the opening operation, and the bottle opener is prevented from moving in the bottle direction so that the engaging claw touches the bottle mouth. If the inclined surface is roughened, the effect is further increased.

[Claim 7]
Moreover, this invention is a bottle opener in any one of Claims 4-6 whose top view shape of the said engagement nail | claw is a concave curve with a curvature radius of 22-27 mm.

  By setting the radius of curvature of the engaging claw to 22 to 27 mm, the engaging claw can be brought into contact with the lower ends of the three or four pleat convex portions of the crown peripheral wall portion, and the opening operation becomes extremely easy.

[Claim 8]
Moreover, this invention is a bottle opener in any one of Claims 4-7 in which the said level | step-difference part is a planar view concave curve with a curvature radius of 12.5-13.5mm.

  By setting the curvature radius of the stepped portion to 12.5 to 13.5 mm, the stepped portion can be brought into contact with 3 to 4 crown folds at the time of opening, and the folds are deformed at the time of opening and the engaging claws Contact with the mouth is prevented.

With the bottle opener of the present invention, the bottle opener is difficult to move in the bottle direction with the opening operation in both the forward opening method and the reverse opening method, and the engaging claw contacts the bottle opening. This prevents the possibility of damaging the bottle mouth.
In addition, since the front end shape of the engaging claw is a concave curve shape, the contact portion between the engaging claw and the lower end of the crown peripheral wall portion is increased, and there is less deformation of the folds on the crown peripheral wall portion when opening the plug. It becomes easy.

1 is a plan view and a central longitudinal sectional view of a bottle opener of Example 1, FIG. 2 is an enlarged perspective view of part A of FIG. 1, FIG. 3 is an enlarged end view of part B of FIG. FIG. 5 is an explanatory view of the forward opening method, FIG. 6 is an explanatory view of the essential portion of the forward opening method, FIG. 7 is an explanatory view of the backward opening method, and FIG. The principal part top view of an operation | movement opening method, FIG. 9, FIG. 10 is explanatory drawing of the example of a rough surface.
In the figure, reference numeral 1 is a bottle opener, 2 is a crown extraction part, 3 is an opening, 4 is an engaging claw, 5 is a rough surface, 6 is a shoulder part, 7 is an uneven part, 8 is a protrusion, 9 is a handle, A glass bottle, 11 is a crown, 11a is a top surface, and 11b is a peripheral wall.

The bottle opener 1 is made of a stainless steel plate having a thickness of 2.4 mm, has a crown punched portion 2 at the tip of the handle 9, and an opening 3 is formed in the crown punched portion. The vertical width W ₁ of the opening 3 is 18 mm, and the horizontal width W ₂ is 27 mm. The shape of the opening is axisymmetric with respect to the vertical and horizontal center lines.

Engaging claws 4 are formed on the inner peripheral edge of the opening 3 on the front end side and rear end side. The engagement claw 4 has a tapered shape in which the tip shape in plan view is a concave curve when viewed from the opening side, and the cross-sectional shape is notched in a triangular shape on both the front and back sides. The length L of the engaging claw is 22.6 mm, the width (depth) is 2.2 mm, and the thickness t of the tip is 1.2 mm. The radii of curvature R ₁ and R ₂ of the front end shape (concave curve) of the rear end side and front end side engaging claws are both 25 mm.
The angles θ ₁ and θ ₂ formed by the front and back slopes of the engaging claws 4 are about 17 °, and both the front and back slopes are rough surfaces 5 (FIG. 3). The shape of the engaging claw 4 is axisymmetric with respect to the vertical and horizontal center lines of the opening 3.

  The outer sides of both end portions in the circumferential direction of the engaging claw 4 are shoulder portions 6 that protrude from the front and back surfaces (slopes) of the engaging claw 4 to the front side or the back side by not being cut out. When one engaging claw 4 is engaged with the lower end of the peripheral wall portion 11b of the crown 11 at the time of opening, the outer shoulder portion 6 of the other engaging claw contacts the crown top surface (FIGS. 4 and 8). ). The shape of the shoulder 6 is axisymmetric with respect to the vertical and horizontal center lines of the opening 3.

Concave and convex portions 7 are formed on the inner peripheral surface on the outer side of both end portions in the circumferential direction of the engaging claw 4. In this embodiment, the concavo-convex portion 7 is composed of two convex portions 7a (FIG. 2). The concavo-convex part 7 contacts the top surface 11a or the peripheral wall part 11b of the crown 11 at the time of opening (FIGS. 4 and 8). The shape of the uneven portion 7 is axisymmetric with respect to the vertical and horizontal center lines of the opening 3.
In the present invention, the top surface of the crown includes not only the horizontal surface portion of the zenith portion but also the rounded portion on the outer periphery thereof, and the peripheral wall portion is a portion where folds are formed below the rounded portion.

  4 to 6 show opening by a normal operation opening method using the bottle opener 1. 4, 5 and the upper part of FIG. 6 are such that the engaging claw on the rear end side of the bottle opener 1 is inserted into the lower end of the crown peripheral wall portion 11b, and the engaging claw on the front end side is brought into contact with the crown top surface 11a. This is the state that is used as a fulcrum. At this time, since the shoulder 6 on the tip side is in contact with the crown top surface 11a, the shoulder 6 on the tip side bites into the crown top surface 11a during the subsequent opening operation, and the bottle opener 1 moves in the bottle direction. Is prevented. Further, since the rough surface 5 of the engagement claw on the rear end side is in contact with the lower end of the crown peripheral wall portion 11b, the bottle opener 1 is prevented from moving in the bottle direction during the opening operation due to friction. The lower part of FIG. 6 shows the middle of the opening operation. When the opening operation is performed, the crown 11 is deformed, so that the rough surface 5 of the engaging claw on the tip side comes into contact with the crown top surface 11a, and the uneven portions on both sides of the engaging claw on the tip side are crowned. A large frictional force is generated by biting into the top surface or peripheral wall of the bottle, and the bottle opener 1 is prevented from moving in the bottle direction.

  7 and 8 show the opening by the reverse operation opening method using the bottle opener 1, the engaging claw on the front end side of the bottle opener 1 is inserted into the lower end of the crown peripheral wall portion 11 b as the action point, and the rear end side The state which made the engaging claw contact the crown top surface 11a and made it a fulcrum is shown. At this time, since the shoulder 6 on the rear end side is in contact with the crown top surface 11a, the bottle opener 1 is prevented from moving in the bottle direction during the subsequent opening operation. Further, since the rough surface 5 of the engaging claw on the distal end side is in contact with the lower end of the crown peripheral wall portion 11b, the bottle opener 1 is prevented from moving in the bottle direction during the opening operation due to friction. When the opening operation is performed, the crown 11 is deformed, so that the rough surface 5 of the engagement claw on the rear end side comes into contact with the crown top surface 11a, and the uneven portions on both sides of the engagement claw on the rear end side. Bites into the top or peripheral wall of the crown and generates a large frictional force, preventing the bottle opener 1 from moving in the bottle direction.

  The concavo-convex portion 7 does not necessarily need to be in contact with the crown in the state where the bottle opener shown in FIGS. 4 and 7 is applied to the crown. If it is.

The vertical width W ₁ of the opening 3 is preferably 15 to 20 mm, and the horizontal width W ₂ is preferably 26 to 28 mm.

The inclination angles θ ₁ and θ ₂ of the inclined surfaces of the engaging claws 4 are preferably 10 ° to 20 °. Moreover, it is preferable that the use on the front and back is the same as θ ₁ = θ ₂ . The thickness t of the engaging claw tip is preferably 0.9 to 1.3 mm. The length L of the engaging claw is preferably 15 to 23 mm, and the width (depth) of the engaging claw is preferably 2 to 3 mm. Similarly, it is desirable that the length and width of the engagement claws on the rear end side and the front end side are also equal. Further, the curvature radii R ₁ and R ₂ of the front end shape (concave curve) of the engagement claws on the rear end side and the front end side are made equal so that the forward opening method and the reverse opening method can be performed under the same conditions. Is preferable.

FIGS. 9 and 10 are examples of the rough surface 5 of the engaging claw, each showing a plan view on the left side and a cut end surface of the left arrow portion on the right side. In FIG. 9, a large number of circular protrusions 8 are provided on the slope of the engaging claw 4 to form a rough surface 5. In FIG. 10, a large number of pyramidal protrusions 8 are provided on the slope of the engaging claw 4 to form a rough surface 5. Preferred surface roughness of the rough surface is 0.2~0.6mm about the maximum height _{R max.}

11 is a schematic plan view of the bottle opener 12 according to the second embodiment, FIG. 12 is a sectional view taken along line CC and DD in FIG. 11, and FIG. 14 and 14 are sectional views taken along line EE in FIG.
In the figure, reference numeral 2 is a crown-extracted portion, 3 is an opening, 4 is an engaging claw, 6 is a shoulder portion, 7 is an uneven portion, 10 is a glass bottle, 11 is a crown, 11a is a top surface, 11b is a peripheral wall portion, 12 Is a bottle opener, 13 is an engaging claw, 14 is a stepped portion, and 15 is an inclined surface.

  The bottle opener 12 is made of a stainless steel plate having a thickness of 2.4 mm, and has a crown punched portion 2 at the tip of the handle 9, and an opening 3 is formed in the crown punched portion. The opening 3 has a vertical width W1 of 18 mm and a horizontal width W2 of 27 mm. The shape of the opening is axisymmetric with respect to the vertical and horizontal center lines.

Engaging claws 13 that are thinner than the surroundings are formed on the inner peripheral edge of the opening 3 on the front end side and rear end side. The engagement claw 13 has a concave shape when viewed from the opening side in a plan view, and a cross-sectional shape is a quadrilateral shape. The length _{L 2} of the engaging claws is 15 mm, the maximum width (depth) of 1.3 mm, the thickness t of the tip portion is 1.2 mm. The front end shape of the engaging claw 13 in plan view is a concave curve having a curvature radius of 25 mm on both the rear end side and the front end side.
A stepped portion 14 having a concave curved shape in plan view is formed on the proximal end side of the engaging claw 13, and when opening, when the engaging claw 13 is engaged with the lower end of the crown peripheral wall portion 11 b, the stepped portion 14 becomes the crown peripheral wall. It contacts the part 11b (FIGS. 13 and 14). The step portion 14 has a radius of curvature of 13 mm, which is smaller than the radius of curvature of the engagement pawl 13 tip.

  In the outer peripheral region of the engaging claw 13, an inclined surface 15 that is inclined downward toward the opening 3 is formed by notching a bottle opener plate into a triangular shape. The inclined surface 15 is a rough surface similar to the rough surface 5 of the first embodiment. The outer sides of both end portions in the circumferential direction of the inclined surface 15 are shoulder portions 6 that protrude from the front surface and the back surface of the inclined surface 15 to the front side or the back side because the notches are not formed. The shoulder 6 has the same effect as the shoulder of the above embodiment. That is, when one engagement claw is engaged with the crown peripheral wall lower end, the shoulder on the other side comes into contact with the crown top surface, and the shoulder bites into the crown top surface with the opening operation, The bottle opener becomes difficult to move in the bottle direction, and the engagement claw is prevented from coming into contact with the bottle mouth.

  FIG. 12A shows an example in which an engaging claw 13, a stepped portion 14, and an inclined surface 15 are formed on both the front and back surfaces of the bottle opener 12. FIG. 4B shows an example in which the engaging claw 13, the stepped portion 14 and the inclined surface 15 are formed on the front surface, and the engaging claw 4 of the first embodiment is formed on the back surface. As shown in FIG. 12A, the stepped portion 14 is desirably formed on both the front surface and the back surface of the bottle opener 12.

  Concave and convex portions 7 are formed on the outer peripheral surface of the engaging claw 13 and on the inner peripheral surface of the inclined surface 15 in the peripheral direction. The concavo-convex part 7 contacts the crown top surface 11a and / or the peripheral wall part 11b at the time of opening. The uneven portion in the present embodiment may be the same as the uneven portion in the first embodiment, and exhibits the same effect.

  13 and 14 show opening by a normal operation opening method using the bottle opener 12, and the engagement claw 13 on the rear end side of the bottle opener 12 is inserted into the lower end of the crown peripheral wall portion 11b as an action point, In this state, the inclined surface 15 or the engaging claw 4 on the back side is brought into contact with the crown top surface 11a to serve as a fulcrum. At this time, since the step 14 on the rear end side is in contact with the lower end of the crown peripheral wall 11b, the bottle opener 12 is prevented from moving in the bottle direction during the subsequent opening operation. Further, the shoulder 6 on the tip side comes into contact with the crown top surface. Since the crown 11 is deformed during the opening operation, the inclined surface 15 on the front end side or the rough surface of the engaging claw 4 comes into strong contact with the crown top surface 11a, and the bottle opener 12 in the bottle direction is caused by this frictional resistance. It is prevented from moving. Further, the concave and convex portions 7 on both sides of the engaging claw 13 on the distal end side bite into the top surface or the peripheral wall portion of the crown, and a large frictional resistance is generated, thereby preventing the bottle opener 12 from moving in the bottle direction.

  In the reverse operation opening method, the engagement claw, the stepped portion, the inclined surface, the shoulder portion, and the concavo-convex portion act in the same manner as in the normal operation opening method by simply switching the front end side and the rear end side. The movement in the bottle direction is prevented.

In this embodiment, the shape and size of the opening may be the same as in the first embodiment.
The length _{L 2} of the engaging claws 13 14～16Mm, maximum width (depth) is 1.2-1.5 mm, the thickness t of the tip 0.9~1.3mm are suitable. Moreover, the cross-sectional shape of the engaging claw may be trapezoidal.
In this embodiment, the appropriate length, width (depth), radius of curvature of the tip, thickness of the tip, the angle of inclination, and the state of the rough surface of the inclined surface 15 are the same as those of the engaging claw 4 of the first embodiment. .

It is the top view and center longitudinal cross-sectional view of the bottle opener 1 of Example 1. FIG. It is the A section expansion perspective view of FIG. It is the B section enlarged end view of Drawing 1. It is a principal part top view of the normal operation opening method. It is explanatory drawing of the normal operation plugging method. It is principal part explanatory drawing of the normal operation plugging method. It is explanatory drawing of the reverse operation opening method. It is a principal part top view of the reverse operation opening method. It is explanatory drawing of an example of a rough surface. It is explanatory drawing of the other example of a rough surface. It is a schematic plan view of the bottle opener 12 of the second embodiment. It is the CC line in FIG. 11, a DD line cutting | disconnection end elevation. It is explanatory drawing of the normal operation opening method using the bottle opener. It is the EE sectional view taken on the line in FIG.

DESCRIPTION OF SYMBOLS 1 Bottle opener 2 Crown extraction part 3 Opening 4 Engagement claw 5 Rough surface 6 Shoulder part 7 Uneven part 8 Protrusion 9 Handle 10 Bottle 11 Crown 11a Top surface 11b Peripheral wall part 12 Bottle opener 13 Engagement nail 14 Step part 15 Inclined surface

Claims (8)

In a bottle opener having a crown opening with an opening at the tip of the handle,
An engagement claw is provided on the inner peripheral edge on the front end side and rear end side of the opening,
The engaging claw has a tapered shape in which the tip shape in plan view is a concave curve shape, and the cross-sectional shape is cut out in a triangular shape on both the front and back sides,
Concave and convex portions are formed on the inner peripheral surface on the outer side of both ends in the circumferential direction of the engaging claw,
The bottle opener, wherein the crown top surface and / or the peripheral wall portion contacts the uneven portion when opening.   The bottle opener according to claim 1, wherein the front and back surfaces of the engaging claws are rough surfaces.   The bottle opener according to claim 1 or 2, wherein the front end shape of the engagement claw is a concave curve having a curvature radius of 22 to 27 mm. In a bottle opener having a crown opening with an opening at the tip of the handle,
Provided with engaging claws thinner than the periphery on the inner peripheral edge on the front end side and rear end side of the opening,
The engaging claw has a concave curved shape at the distal end in a plan view, and a stepped portion having a concave curved shape in a planar view is formed on the proximal end side of the engaging claw. When engaged, the stepped portion contacts the lower end of the crown peripheral wall,
A bottle opener characterized in that a concave and convex portion is formed on the inner peripheral surface outside the both ends in the circumferential direction of the engaging claw, and the crown top surface and / or the peripheral wall portion contacts the concave and convex portion when the cap is opened.   The bottle opener of Claim 4 which formed the inclined surface which becomes a downward inclination toward the said opening in the outer peripheral area | region of the said engagement nail | claw.   6. The bottle opener according to claim 5, wherein the inclined surface is a rough surface.   The bottle opener according to any one of claims 4 to 6, wherein the front end shape of the engagement claw is a concave curve having a curvature radius of 22 to 27 mm.   The bottle opener according to any one of claims 4 to 7, wherein the stepped portion is a concave curve in plan view with a radius of curvature of 12.5 to 13.5 mm.

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