JP5264310B2 - Aerosol device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aerosol device having a simple structure which enables the content remaining in the aerosol container to be surely discharged, and at the same time the discharged content to be hardly dispersed into surrounding area. <P>SOLUTION: The aerosol device 1 injects the content stored in an aerosol container 2 through an injection port 7 of an injection button 3 through a stem 2b pushed down together with the injection button 3 through a depressing operation of the injection button 3, wherein when the content remaining in the aerosol container 2 is discharged, a cover cap 4 is removed from the aerosol container 2 and installed again at the aerosol container 2 in such a way as one in which the direction of the cover cap 4 with respect to the injection button 3 is changed over from a first state to a second state, thereby the injection button 3 is forcedly depressed down to cause the stored content injected from the injection port 7 to be discharged into a space S between an outer cylinder 11 and an inner cylinder 11 through a discharging opening 20. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to improvements in aerosol devices.

  In general, an aerosol device ejects gas or liquid in an aerosol container by pressing an injection button. In addition, aerosol containers that contain paints, insecticides, cosmetics, etc. contain combustibles such as main agents (contents other than propellants consisting of liquids and solids) and propellants (liquefied petroleum gas, dimethyl ether, isopentane, etc.) Even when the main agent is exhausted and the spraying is finished, a small amount of propellant remains in the container.

  By the way, when disposing of such an aerosol device, in consideration of safety at the time of dust collection or compression processing, the user keeps pushing the injection button until no sound is generated or a hole is formed in the aerosol container. The propellant remaining in the used aerosol container must be discharged by the operation of opening the container. However, the operation of manually discharging the remaining propellant is very troublesome because the spray button of the aerosol container must be pressed for a long time. Further, in order to keep pressing the spray button for a long time, it is often necessary to change the aerosol container and continue to spray the contents remaining in the container, and the contents cannot be reliably discharged. Furthermore, since these operations are time-consuming, there is a problem that the contents remaining in the aerosol container are discarded without being completely discharged.

  In view of this, a residue discharge mechanism for easily and safely discharging the entire content (residue) remaining in such a used aerosol container has been proposed (see Patent Document 1). Specifically, the aerosol container residue discharging mechanism described in Patent Document 1 is roughly configured by a cylindrical injection button that is attached to the stem of the aerosol container and a shoulder cover that is fitted to the top of the aerosol container. ing. The injection button has a projection, and the shoulder cover has a cylindrical central hole into which the injection button is inserted. The projection of the injection button is slidable on the annular peripheral wall forming the central hole. A deep cut portion and a shallow cut portion to be inserted are provided. Furthermore, the deep cutouts and the shallow cutouts are alternately formed at equal intervals in the circumferential direction of the central hole.

In the method of using the aerosol container residue discharging mechanism, in a normal use, the protrusion of the injection button is fitted into the deep cutout, and the movement distance of the injection button is set to be long. The stem can be opened and closed by pressing the injection button and releasing the pressure. On the other hand, when discharging the contents remaining in the aerosol container, the position of the injection button is changed to insert the protrusion into the shallow notch, thereby restricting the movement of the injection button. Thereby, since a stem is always pressed by the injection button, an open state is maintained. In this state, the residue in the aerosol container is released.
Japanese Patent No. 3698309

  However, the above-described aerosol container residual release mechanism has a problem in that when the remaining contents are discharged, the contents are scattered around and the surrounding environment is contaminated.

  The present invention has been proposed in view of the above-described conventional circumstances, and it is possible to reliably discharge the contents remaining in the aerosol container with a simple structure, and the discharged contents are not easily scattered around. The purpose is to provide.

In order to achieve the above object, an invention according to claim 1 of the present invention includes an aerosol container in which contents are stored, a cover cap placed on an upper part of the aerosol container, and a distal end portion of a stem of the aerosol container. The contents contained in the aerosol container are ejected through a stem that is pushed down integrally with the injection button, and the contents remaining in the aerosol container are discharged by pressing the injection button. In this case, the contents remaining in the aerosol container are removed by removing the cover cap from the aerosol container and reattaching the cover cap to the spray container so that the orientation of the cover cap with respect to the spray button is changed from the first state to the second state. Is an aerosol device that can be discharged into the cover cap, the spray button is the stem It has a stem fitting part to be fitted, an injection port communicating with the stem fitting part, and a guide protrusion protruding to the side, and the cover cap is detachably attached to the upper part of the aerosol container The outer cylinder portion, the injection button movably accommodated in the vertical direction, and the upper portion between the outer cylinder portion and the inner cylinder portion that closes the upper surface between the outer cylinder portion and the inner cylinder portion. A wall, an injection opening that opens a surface of the outer tube and the inner tube facing the injection port in the first state, and a surface of the wall facing the injection port of the inner tube in the second state A discharge opening for opening the guide, a guide slit for guiding the guide projection of the injection button inserted in the inner cylinder portion in the first state so as to be movable in the vertical direction, and a guide slit inserted in the inner cylinder portion in the second state. a guide regulating portion for regulating the movement of the guide protrusion of the injection button has, injection And a pair of partition walls for connecting the outer cylindrical portion and the inner cylindrical portion in both sides of the use opening, in a first state, by pressing the injection button, is accommodated in the aerosol container In the second state, when the cover cap is remounted, the guide protrusion comes into contact with the guide restricting portion and the injection button is forced. Between the outer cylindrical portion, the inner cylindrical portion, the upper wall portion, and the pair of partition walls through the discharge opening so as to prevent the contents injected from the injection port from being scattered around by being pushed down. It is an aerosol apparatus characterized by being discharged into a partitioned space.

In the invention according to claim 2 of the present invention, the horizontal cross section of the injection button has an oval shape that is long in the front-rear direction, and the inner cylinder portion has an oval shape that is long in the front-rear direction in accordance with the shape of the injection button. 2. The aerosol device according to claim 1 , wherein the aerosol device has an inner diameter slightly larger than an outer diameter of the injection button so that the injection button is housed so as to be movable in the vertical direction .

  As described above, in the aerosol device according to the present invention, when the contents remaining in the aerosol container are discharged, the contents injected from the injection port are connected to the outer cylinder part and the inner cylinder part through the discharge opening. Since the space is discharged into the space, it is possible to prevent the discharged content from being scattered around while effectively using such a space for discharging the remaining content.

Hereinafter, an aerosol apparatus to which the present invention is applied will be described in detail with reference to the drawings.
First, the structure of the aerosol apparatus 1 shown in FIG.1 and FIG.2 as one Embodiment of this invention is demonstrated. 1 shows a stationary state during normal use of the aerosol device 1, and FIG. 2 shows an injection state during normal use of the aerosol device 1.

  As shown in FIGS. 1 and 2, the aerosol device 1 includes an aerosol container 2 in which contents are stored, an injection button 3 for injecting the contents stored in the aerosol container 2, and an aerosol container 2. A cover cap 4 is provided on the top.

  The aerosol container 2 is a metal pressure-resistant container made of, for example, steel or aluminum, and includes a mounting cup 2a provided on an upper portion of the pressure-resistant container, a stem 2b protruding from an inner central portion of the mounting cup 2a, And a valve mechanism (not shown) that is opened by pushing down the stem 2b. Moreover, the outer peripheral part of the mounting cup 2a forms the tightening part 2c by being wound around the upper end part of a pressure-resistant container.

  The contents contained in the aerosol container 2 are not particularly limited. For example, insecticides, repellents, bactericides, fragrances, indoor deodorants, hair styling agents, hair care agents, hair growth tonics. Agents, shaving foams, antiperspirant deodorants, glass cleaners, air conditioner cleaners, waterproofing agents, paints, industrial sprays and the like. The aerosol container 2 is filled with a stock solution containing a solvent or an auxiliary agent as necessary in addition to the active ingredients according to various purposes, and a propellant such as liquid gas or compressed gas as contents. Has been.

  As shown in FIGS. 1, 2, 3 and 4, the injection button 3 includes a button main body 5, a stem fitting portion 6 fitted to the stem 2 b at the bottom of the button main body 5, and the button main body. 5 has an injection port 7 communicated with the stem fitting portion 6 and a pair of guide projections 8 projecting sideways from both side surfaces of the button body 5, and these are integrally molded. Made of plastic material.

  The button body 5 has a substantially cylindrical shape as a whole, and has a side wall portion 5a having an oval shape (so-called racetrack shape) whose horizontal cross section is long in the front-rear direction, and an upper wall portion that closes the upper surface of the side wall portion 5a. 5b. Further, the button body 5 has a shape in which the upper wall portion 5b is recessed in order to facilitate the pressing operation of the injection button 3. Further, a reinforcing rib wall 5 c is provided inside the button body 5.

  An injection guide 9 is provided on the front side surface of the side wall portion 5a to discharge the contents injected from the injection port 7 radially. The injection port 7 is formed by a hole formed in the center of the bottom surface of the injection guide 9.

  The stem fitting portion 6 is located at the center of the bottom surface of the button body 5 and is suspended from the lower surface of the upper wall portion 5b. The stem fitting portion 6 has a substantially cylindrical shape, and has a communication hole 6a and a stem fitting hole 6b inside thereof. Among these, the communication hole 6 a is a portion that communicates with the injection port 7, and is formed from the upper end portion of the stem fitting portion 6 to a midway portion in the length direction. On the other hand, the stem fitting hole 6b is a portion into which the distal end portion of the stem 2b is fitted, and is formed from the lower end portion of the communication hole 6a to the lower end portion of the stem fitting portion 6. The stem fitting hole 6b has a diameter corresponding to the outer diameter of the stem 2b, and the communication hole 6a has a smaller diameter than the stem fitting hole 6b. Thereby, the step part formed between the communication hole 6a and the stem fitting hole 6b forms the contact surface 6c with which the tip of the stem 2b contacts. Further, a tapered surface 6d is provided at the lower end portion of the stem fitting hole 6b to facilitate fitting the stem 2b into the stem fitting hole 6b.

  The pair of guide protrusions 8 are disposed on the front side of the lower side central portion of the pair of side wall portions 5a and are opposed to each other.

  As shown in FIGS. 1, 2, 5, and 6, the cover cap 4 accommodates an outer cylinder portion 10 that is detachably attached to the upper portion of the aerosol container 2 and an injection button 3 that is movable in the vertical direction. And an inner cylinder part 11 that faces the upper part of the injection button 3 outward, and an upper wall part 12 that closes the upper surface between the outer cylinder part 10 and the inner cylinder part 11, and these are integrally molded Made of plastic material.

  The outer cylinder portion 10 has a substantially cylindrical shape and is substantially the same diameter as the outer diameter of the aerosol container 2, and a convex portion 10 a is provided on the inner peripheral surface on the lower side in the circumferential direction. The cover cap 4 is detachably attached to the upper part of the aerosol container 2 by fitting the convex part 10a of the outer cylinder part 10 into the concave part formed between the winding part 2c and the pressure-resistant container. It is possible to do.

  The inner cylinder portion 11 has an oval shape (so-called race track shape) that is long in the front-rear direction in accordance with the shape of the injection button 3, and the injection button 3 is accommodated so as to be movable in the vertical direction. As described above, the button body 5 has an inner diameter slightly larger than the outer diameter. This inner cylinder part 11 is arrange | positioned in the inner center part of the outer cylinder part 10, and the upper-end opening part 11a has faced the exterior.

  Further, the cover cap 4 is provided with an operation recess 13 for facilitating the pressing operation of the spray button 3 facing outward from the inner cylinder portion 11. The operation recess 13 has a shape formed by recessing the upper wall portion 12 around the injection button 3 accommodated in the inner cylinder portion 11 and a part on the back side of the outer cylinder portion 10. Further, a tapered surface 11 c for facilitating insertion of the injection button 3 inside the inner cylinder portion 11 is provided at the lower end portion of the inner cylinder portion 11.

  A pair of guide projections 8 of the injection button 3 inserted inward from the lower end opening portion 11b of the inner cylinder portion 11 are movably guided on both side surfaces of the inner cylinder portion 11 in the normal use. The guide slit 14 is provided. The pair of guide slits 14 is located on the front side of the center part of both side surfaces of the inner cylinder part 11 and has a width corresponding to the guide protrusion 8 from the lower end side of the inner cylinder part 11 to the movable range of the injection button 3. It is formed so as to cut out linearly.

  Further, the movement of the pair of guide protrusions 8 of the injection button 3 inserted inward from the lower end opening portion 11b of the inner cylinder portion 11 is restricted on both side surfaces of the inner cylinder portion 11 when residual contents to be described later are discharged. A pair of guide restricting portions 15 are provided. The pair of guide restricting portions 15 are formed of slits formed with a sufficient width to guide the guide protrusion 8 from the lower end side of the inner cylinder portion 11 in parallel to the guide slit 14 and shorter than the guide slit 14. The inner cylinder portion 11 is provided on the rear side with respect to the center portion on both side surfaces.

  Further, on both side surfaces of the inner cylinder part 11, a pair of retaining parts 16 are provided to prevent the injection button 3 inserted inside from the lower end opening part 11 b of the inner cylinder part 11. The pair of retaining portions 16 includes a pair of elastic pieces 17a formed integrally with the inner cylinder portion 11, and a locking claw 17b formed on the pair of elastic pieces 17a. The pair of elastic pieces 17a is provided between the guide slit 14 and the guide restricting portion 15 so as to be elastically deformable. The locking claw 17b is provided so as to slightly protrude inward from the distal ends of the pair of elastic pieces 17a.

  The cover cap 4 is provided with injection openings 18 a and 18 b that open the front side of the outer cylinder portion 10 and the inner cylinder portion 11. These injection openings 18a and 18b are circular holes for discharging the contents injected from the injection port 7 to the outside of the cover cap 4 during normal use. The outer cylinder part 10 and the inner cylinder part 11 is provided on the front surface of the injection button 3, that is, the surface facing the injection port 7 of the injection button 3 during normal use. Further, since the contents are ejected radially from the ejection port 7, the ejection opening 18 b on the inner cylinder part 11 side has substantially the same diameter as the ejection guide 9, and the ejection opening on the outer cylinder part 10 side. The part 18a has a larger diameter than the injection opening 18b on the inner cylinder part 11 side.

  The cover cap 4 is provided with a pair of partition walls 19 that connect between the outer cylinder part 10 and the inner cylinder part 11 on both sides of the injection openings 18a and 18b. The pair of partition walls 19 are provided so as to partition the space S formed between the outer cylinder part 10 and the inner cylinder part 11 on the injection openings 18a and 18b side. Thereby, the contents injected from the injection port 7 are prevented from entering the space S partitioned by the pair of partition walls 19. The pair of partition walls 19 also function as reinforcing ribs by connecting the outer cylinder portion 10 and the inner cylinder portion 11.

  The cover cap 4 is provided with a discharge opening 20 that opens the back side of the inner cylinder portion 11. This discharge opening 20 is a slit for discharging the contents injected from the injection port 7 to the space S between the outer cylinder part 10 and the inner cylinder part 11 at the time of residual content discharge described later, It is provided on the back surface of the inner cylinder portion 11, that is, on the surface facing the injection port 7 of the injection button 3 when discharging the residual contents, and along the moving direction (vertical direction) of the injection button 3 from the lower end side of the inner cylinder portion 11. It is formed so as to be cut out linearly.

Next, the operation | movement at the time of normal use of the aerosol apparatus 1 which has the above structures is demonstrated.
In the aerosol device 1, first, in a stationary state during normal use shown in FIG. 1, the stem 2 b of the aerosol container 2 is fitted into the stem fitting hole 6 a of the stem fitting portion 6, and the tip of the stem 2 b. Is brought into contact with the contact surface 6c, whereby the injection button 3 is attached to the tip of the stem 2b.

  In this state, the cover cap 4 is put on the top of the aerosol container 2. At this time, the cover cap 4 is attached to the upper part of the aerosol container 2 so that the injection port 7 on the injection button 3 side and the injection openings 18a and 18b on the cover cap 4 side are in the same direction. Thereby, the injection button 3 is vertically moved into the inner cylinder portion 11 in a state where the pair of guide protrusions 8 of the injection button 3 inserted from the lower end opening portion 11 b of the inner cylinder portion 11 is engaged with the pair of guide slits 14. Housed in a movable state. Further, when the injection button 3 is inserted from the lower end opening portion 11b of the inner cylinder portion 11, it comes into contact with the locking claws 17b of the pair of retaining portions 16 and elastically deforms the elastic piece 17a while It is inserted into the part 11. And after being accommodated in the inner cylinder part 11, it will be in the state where it was prevented from coming off from the lower end opening part 11b of the inner cylinder part 11 with a pair of latching claw 17b.

  In addition, when the direction of the cover cap 4 with respect to the injection button 3 is in such a normal use state is referred to as a first state, and in this first state, the injection port 7 has the injection openings 18a and 18b. It is in a position to face.

  Next, when injecting the contents contained in the aerosol container 2 during normal use, as shown in FIG. 2, the injection button 3 facing outward from the upper end opening portion 11a of the inner cylinder portion 11 is moved downward. Press and operate. Thereby, the contents accommodated in the aerosol container 2 are ejected from the ejection port 7 through the communication hole 6a of the stem fitting portion 6 through the stem 2b pushed down integrally with the ejection button 3, and are ejected from the ejection port 7. The discharged contents are discharged radially to the outside of the cover cap 4 through the injection openings 18a and 18b. On the other hand, when stopping the injection of the contents, the pressing on the injection button 3 described above is released. Thereby, the stem 2b pushed down integrally with the injection button 3 returns to the original position and the injection is stopped.

Next, the operation | movement at the time of the residual content discharge | emission of the said aerosol apparatus 1 is demonstrated.
In the aerosol device 1, when the aerosol container 2 has been used and the contents remaining in the aerosol container 2 are discharged, first, the cover cap 4 is removed from the aerosol container 2. At this time, the injection button 3 that is prevented from being detached by the pair of retaining portions 16 (the locking claws 17 b) is removed from the distal end portion of the stem 2 b together with the cover cap 4 while being held in the inner cylinder portion 11.

  Next, as shown in FIG. 7, the direction of the injection button 3 is changed so that the injection port 7 on the injection button 3 side and the injection openings 18a and 18b on the cover cap 4 side are opposite to each other. After the injection button 3 is accommodated in the inner cylinder portion 11 of the cover cap 4, the cover cap 4 is reattached to the upper portion of the aerosol container 2 together with the injection button 3. At this time, the stem 2b of the aerosol container 2 is fitted into the stem fitting hole 6c of the injection button 3, and the tip of the stem 2b is brought into contact with the contact surface 6d. Furthermore, when the pair of guide protrusions 8 are brought into contact with the pair of guide restricting portions 15, the injection button 3 is forcedly pushed down. As a result, the stem 2b is continuously pushed down, and the content remaining in the aerosol container 2 is injected from the injection port 7 through the communication hole 6a of the stem fitting portion 6, and is injected from this injection port 7. Residual content is discharged through the discharge opening 20 into the space S between the outer cylinder portion 10 and the inner cylinder portion 11.

  In addition, when the orientation of the cover cap 4 with respect to the injection button 3 is in such a state at the time of discharging the residual content, it is referred to as a second state. It is in a position to face.

  As described above, in the aerosol device 1 to which the present invention is applied, the content remaining in the aerosol container 2 is discharged into the cover cap 4, so that the discharged content is prevented from being scattered around. Is possible. In particular, in the aerosol device 1, the contents ejected from the ejection port 7 are discharged into the space S between the outer tube portion 10 and the inner tube portion 11 through the discharge opening 20, and thus such a cover. It is possible to effectively use the space S in the cap 4 for discharging residual contents.

  Further, in the aerosol device 1, when discharging the contents remaining in the aerosol container 2, the cover cap 4 is removed, and the cover cap 4 and the spray button 3 are switched in direction and reattached. The contents remaining in the aerosol container 2 can be discharged safely and reliably.

  Furthermore, since this aerosol apparatus 1 can remove the cover cap 4 and the injection button 3 integrally from the aerosol container 2 after discharging the contents remaining in the aerosol container 2, the cover cap 4 and the injection It is possible to easily separate and discard the button 3.

  In the aerosol device 1, when the contents remaining in the aerosol container 2 are discharged, the above-described cover cap 4 and the injection button 3 are not limited to being remounted on the upper part of the aerosol container 2, and the injection is performed. It is also possible to reattach the cover cap 4 to the upper part of the aerosol container 2 after attaching the button 3 to the tip of the stem 2b.

  In the aerosol device 1, when the configuration of the pair of retaining portions 16 is omitted, only the cover cap 4 is removed, and the orientation of the cover cap 4 with respect to the spray button 3 attached to the distal end portion of the stem 2 b is changed. It is also possible to replace and reattach the cover cap 4 to the aerosol container 2.

  Further, the shape of the injection button 3 is not particularly limited to this, and other than the above-described horizontal cross section having an oval shape, for example, a circular shape, an oval shape, a rectangular shape, etc. Also good. In any shape, the direction of the cover cap 4 with respect to the injection button 3 can be changed from the first state to the second state.

  The shape of the injection button 3 is such that when the cover cap 4 once removed is replaced and reattached to the aerosol container 2, the replacement direction such as the elliptical shape is easily recognized. Good. In the present invention, a mark or the like may be provided so that the remounting position of the cover cap 4 can be known.

FIG. 1 is a longitudinal sectional view showing a stationary state of an aerosol device to which the present invention is applied during normal use. FIG. 2 is a longitudinal sectional view showing an injection state during normal use of the aerosol device shown in FIG. FIG. 3 is a bottom view showing an injection button of the aerosol device shown in FIG. 4 is a longitudinal sectional view taken along line A-A ′ of the injection button shown in FIG. 3. FIG. 5 is a bottom view showing a cover cap of the aerosol device shown in FIG. 1. FIG. 6 is a longitudinal sectional view taken along line B-B ′ of the cover cap shown in FIG. 5. FIG. 7 is a longitudinal sectional view showing a state when the residual contents of the aerosol device shown in FIG. 1 are discharged.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Aerosol apparatus 2 ... Aerosol container 2b ... Stem 3 ... Injection button 4 ... Cover cap 7 ... Injection port 8 ... Guide protrusion 8a, 8b ... Chamfering part 10 ... Outer cylinder part 11 ... Inner cylinder part 14 ... Guide slit 15 ... Guide Restricting part 16 ... Detaching part 18a, 18b ... Injection opening 19 ... Partition wall 20 ... Discharge opening

Claims (2)

An aerosol container containing the contents;
A cover cap placed on top of the aerosol container;
A spray button attached to the tip of the stem of the aerosol container;
By pressing the spray button, the contents contained in the aerosol container are sprayed through the stem pushed down integrally with the spray button,
When discharging the contents remaining in the aerosol container, the aerosol is removed so that the cover cap is removed from the aerosol container and the orientation of the cover cap with respect to the spray button is switched from the first state to the second state. An aerosol apparatus in which the contents remaining in the aerosol container can be discharged into the cover cap by being remounted on the container,
The injection button includes a stem fitting portion that is fitted to the stem, an injection port that communicates with the stem fitting portion, and a guide protrusion that protrudes laterally.
The cover cap includes an outer cylinder portion that is detachably attached to an upper portion of the aerosol container, an inner cylinder portion that accommodates the injection button so as to be movable in the vertical direction and faces the upper portion of the injection button outward. An upper wall portion that closes an upper surface between the outer tube portion and the inner tube portion, and a surface side that faces the injection port of the outer tube portion and the inner tube portion in the first state is opened. An ejection opening, an ejection opening that opens a surface of the inner cylinder facing the ejection opening in the second state, and an ejection button inserted into the inner cylinder in the first state A guide slit that guides the guide projection so as to be movable in the vertical direction, a guide regulating portion that regulates movement of the guide projection of the injection button inserted into the inner cylinder portion in the second state, and the injection On both sides of the opening And a pair of partition walls connecting between the inner cylinder part and the Kigai tubular portion,
In the first state, by pressing the spray button, the contents stored in the aerosol container are sprayed from the spray port to the outside of the cover cap through the spray opening,
In the second state, when the cover cap is remounted, the guide protrusion comes into contact with the guide restricting portion, and the injection button is forcibly pushed down, so that the content injected from the injection port Is discharged to a partitioned space between the outer tube portion, the inner tube portion, the upper wall portion, and the pair of partition walls through the discharge opening so as to prevent the air from being scattered around. The aerosol apparatus characterized by the above-mentioned. The injection button has an oval shape whose horizontal cross section is long in the front-rear direction,
The inner cylinder portion has an oval shape that is long in the front-rear direction in accordance with the shape of the injection button, and the outer diameter of the injection button is stored so that the injection button can be moved in the vertical direction. The aerosol device according to claim 1 , wherein the aerosol device has a slightly larger inner diameter .

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