Aerosol generating device equipped with fixing means

Abstract

To provide, e.g., an aerosol-generating device allowing secure holding of an aerosol-generating article without undue burden on a user when inserting the aerosol-generating article into the aerosol-generating device.SOLUTION: An aerosol-generating device (100) includes: a housing (110) defining a cavity (116) to receive an aerosol-generating article (10); and a constricting member (160) connected to the housing. The cavity has an open end through which the aerosol-generating article is receivable in the cavity, and the constricting member is moveable between an open position and a constricting position to selectively constrict the cavity, thereby allowing the aerosol-generating article to be selectively gripped or released.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present invention relates to an aerosol generating device for use in an aerosol generating system, and to an aerosol generating system comprising an aerosol generating device. [Background technology]

[0002] One type of aerosol generating system is an electrically operated system that typically comprises an aerosol generating device, including a battery, control electronics and an electric heater, and an aerosol generating article specifically designed for use with the aerosol generating device. In some examples, the aerosol generating article comprises an aerosol generating substrate, such as a tobacco rod or tobacco plug, and a heater housed within the aerosol generating device is inserted into or around the aerosol generating substrate when the aerosol generating article is inserted into the aerosol generating device. In an alternative electrically operated system, the aerosol generating article may comprise a capsule that contains an aerosol generating substrate, such as loose tobacco.

[0003] Aerosol generating devices are generally reusable with multiple disposable or refillable aerosol generating articles. When the aerosol generating article is inserted into the aerosol generating device, the relative position of the aerosol generating article and the heater can be important for consistent aerosol characteristics. Furthermore, the ease of inserting or removing the aerosol generating article into or from the aerosol generating device is also important to avoid difficulties for the user and can reduce the risk of the aerosol generating article being damaged when inserted into the aerosol generating device.

[0004] It would therefore be desirable to provide an aerosol generating device that allows aerosol-generating articles to be securely held without imposing undue strain on the user when inserting the article into the aerosol generating device. Summary of the Invention

[0005] According to a first aspect of the present invention, there is provided an aerosol generating device comprising a housing defining a cavity for receiving an aerosol-generating article, the cavity having an open end through which the article can be received in the cavity, and a clamping member connected to the housing, wherein the clamping member is movable between an open position and a clamping position to selectively clamp at least a portion of the cavity.

[0006] Advantageously, the aerosol generating device according to the invention provides a simple way for the user to insert, grip and remove the aerosol-generating article. When the clamping member is in the open position, the aerosol-forming substrate can be easily inserted into and removed from the cavity. When the clamping member is in the clamped position, the minimum diameter of the cavity is small so that the aerosol-generating article can be securely gripped by the device and held in place in the cavity. This avoids the need to compromise between secure gripping of the aerosol-generating article by the aerosol generating device and easy insertion of the aerosol-generating article into the aerosol generating device, as is the case with other devices. The clamping member remains connected to the housing regardless of whether it is in the clamped or open position. Thus, it is not necessary to remove the clamping member from the housing in order to insert the aerosol-generating article into the cavity.

[0007] The terms "pinching" and "pinching" as used herein refer to a reduction in the minimum diameter of the cavity, i.e., a reduction in the smallest dimension of the cavity in the transverse direction of the aerosol generating device.

[0008] In preferred examples, the terms "pinch" and "pinching" refer to reducing the minimum diameter of the cavity by at least 2 percent, at least 5 percent, at least 10 percent, or at least 20 percent. In these examples, it is preferred that the minimum diameter of the cavity is not reduced by more than 50 percent.

[0009] In a preferred example, the clamping member is selectively movable between an open position and a clamped position to selectively clamp at least a portion of the recess when the aerosol-generating article is received within the recess.

[0010] In a preferred example, when the clamping member is in the open position, the minimum diameter of the cavity is equal to or greater than, and preferably greater than, the maximum outer diameter of the aerosol-generating article used in the device. When the clamping member is in the clamped position, the minimum diameter of the cavity should be less than, or equal to, and preferably less than, the maximum outer diameter of the aerosol-generating article used in the device. In any configuration, the minimum diameter of the cavity when the clamping member is in the open position is greater than the minimum diameter of the cavity when the clamping member is in the clamped position.

[0011] When the clamping member is in the open position, the minimum diameter of the cavity is equal to or greater than the maximum outer diameter of the aerosol-generating article, preferably slightly greater. When the clamping member is in the clamping position, the minimum diameter of the cavity is equal to or less than the maximum outer diameter of the aerosol-generating article, preferably slightly less. In any configuration, the minimum diameter of the cavity is relatively greater when the clamping member is in the open position than when it is in the closed position.

[0012] The clamping member may be freely movable between the open and clamped positions, meaning that the clamping member generally remains in the position to which it was last moved by the user. In such an example, the clamping member may be manually moved by the user between the open and clamped positions and vice versa.

[0013] The clamping member, when in the clamping position, may be arranged to clamp the cavity at any suitable location along the length of the cavity, i.e., any location along the length of the cavity adjacent the aerosol-generating article when fully inserted into the cavity. In a preferred example, the clamping member is movable between an open position and a clamping position to selectively clamp the open end of the cavity. This enables the clamping member to provide a particularly secure grip of the aerosol-generating article.

[0014] In certain preferred embodiments, the clamping member is biased towards the clamped position. This means that the clamping member moves automatically from the open position to the clamped position without user action. In this arrangement, the clamping member is held in the clamped position unless moved to the open position by the user. This advantageously allows the aerosol generating device to securely grip the aerosol generating article when it is received in the recess, without the user having to manually move the clamping member from the open position to the clamped position. It may also reduce the likelihood of the clamping member being unintentionally moved from the clamped position to the open position, for example if the device is accidentally banged during use.

[0015] The clamping member may be biased toward the clamped position by any suitable mechanism. For example, the clamping member and a portion of the housing (e.g., at the open end of the recess) may be cooperatively molded such that a restoring force is exerted on the clamping member by the housing when the clamping member is in the open position, biasing the clamping member toward the clamped position. One or both of the clamping member and the portion of the housing (e.g., at the open end of the recess) may be elastically deformed when the clamping member is in the open position, whereby the elastic deformation provides a restoring force to bias the clamping member toward the clamped position.

[0016] The aerosol generating device according to the present invention may further comprise a spring between the housing and the clamping member, the spring being arranged to bias the clamping member towards the clamped position.

[0017] In certain embodiments, the fastening member comprises a collar that extends around the outside of the recess in the housing. Advantageously, this may provide a particularly robust arrangement. In such embodiments, the collar may extend around the outer surface of the housing, for example around the outer surface of a wall of the housing that defines the recess. Alternatively, or additionally, part or all of the collar may be received within a recess or depression in the housing.

[0018] In other examples, the clamping member may extend only partially around the exterior of the recess or housing, or may extend partially around a portion of the exterior of the recess or housing, such as an open end of the recess. For example, the clamping member may comprise a C-shaped member, or a finger, arm, or other similar element that is movable to clamp the recess, such as by clamping the open end of the recess.

[0019] In any of the above embodiments, the clamping member may be slidably connected to the housing such that it is movable along the length of the housing. This may advantageously result in a compact and simple arrangement. In one particular example, the clamping member comprises a collar that extends around and is slidably connected to the housing such that it is movable along a region of the length of the housing.

[0020] In other examples, the clamping member may be pivotally connected to the housing such that it is movable between the open and clamped positions by a pivoting motion. In still further examples, the clamping member may be rotatable relative to the housing such that it is movable between the open and clamped positions by a rotation. For example, the clamping member may be connected to the housing by a threaded connection such that rotation of the clamping member moves the clamping member relative to the housing along the axial direction of the threaded connection. In such examples, the axial direction of the threaded connection may be substantially parallel to or aligned with a longitudinal axis of the housing such that the clamping member is movable along the length of the housing with rotation of the clamping member on the threaded connection.

[0021] In embodiments in which the clamping member is movable along a region of the length of the housing, the housing preferably further comprises a recess for receiving at least a portion of the clamping member when the clamping member is in the open position. In this arrangement, the clamping member can extend into the recess when moved to the open position. This may advantageously reduce interference between the clamping member and the portion of the device where the user grips, compared to an arrangement in which the clamping member moves only along the outer surface of the housing. This allows the clamping member to be increased in size to allow easier handling of the clamping member without adversely affecting the user's grip on the housing. In some embodiments, the clamping member is slidably connected to the housing such that it is movable along at least a region of the length of the housing, and the housing further comprises a recess for receiving at least a portion of the clamping member when the clamping member is in the open position.

[0022] In another example, the clamping member is movable along the length of the housing and over an exterior surface of the housing such that the clamping member is exterior to the housing in both the clamped and open positions.

[0023] In any of the above embodiments, the housing preferably comprises a body and a movable wall connected to the body, the movable wall defining at least a portion of an open end of the cavity, where the movable wall is movable between a first position in which the open end has a first minimum diameter and a second position in which the open end has a second, smaller minimum diameter, and the fastening member is arranged to selectively fasten the open end of the cavity by deflecting the movable wall to the second position. In this arrangement, the minimum diameter of the open end of the cavity is defined by the movable wall, and the open end of the cavity may be indirectly fastened by the fastening member via the movable wall. In another example, the minimum diameter of the open end of the cavity may be defined by the fastening member, and the fastening member may be arranged to selectively fasten the open end of the cavity directly.

[0024] As used herein, the term "movable wall" means a portion of the housing that forms a sidewall that defines a portion of the cavity, and that is configured for movement relative to the body of the housing.

[0025] Preferably, the movable wall defines the entire open end of the cavity. In other words, the movable wall may extend around the entire perimeter at the open end of the cavity. In such embodiments, the movable wall may extend in a continuous or discontinuous manner around the perimeter of the cavity. If the movable wall is discontinuous, it may extend around the entire perimeter of the open end of the cavity, with each of the multiple sections being separated from adjacent sections by a narrow gap. In other embodiments, the movable wall may extend only partially around the perimeter of the cavity, with the remainder of the cavity being defined by one or more additional wall sections, which may be fixed or may be movable relative to the body of the housing.

[0026] In some examples, the movable wall defines only the open end of the cavity. In such examples, the remainder of the cavity may be defined by one or more additional wall sections, which may be fixed or movable relative to the body. In other examples, the movable wall defines both the open end of the cavity and the sidewall of the cavity along at least a portion of the length of the cavity. In one particular example, the movable wall defines the open end of the cavity and the sidewall of the cavity along substantially the entire length of the cavity.

[0027] The movable wall may be formed from a single unitary component. In other examples, the movable wall may be formed from multiple components. For example, the movable wall may be formed from multiple walls or pivotally mounted blades or leaves (such as iris blades) disposed around the open end of the cavity.

[0028] The movable wall may be biased towards the first position when the clamping member is in the open position. Advantageously, in this arrangement, the movable wall automatically moves to the first position when the clamping member is moved to the open position to enlarge the open end of the recess and reduce strain on the user.

[0029] In a preferred embodiment, the movable wall is resilient and is arranged to flex relative to the body of the housing by elastic deformation to move to the second position when the clamping member is moved to the clamped position, and to automatically return to the first position when the clamping member is moved to the open position. This provides a simple and robust means by which the movable wall can be biased towards the first position to allow easy insertion or removal of the aerosol-generating article.

[0030] In such an embodiment, the movable wall may be fixed to the body of the housing such that movement between the first and second positions occurs by deformation only.

[0031] The movable wall may be connected to the body of the housing by a hinge about which the movable wall is movable between a first position and a second position.

[0032] The aerosol generating device is preferably an electrically heated aerosol generating device and further comprises an electric heater, in such an example the electric heater is preferably positioned within the cavity for heating the aerosol-forming substrate when received within the cavity.

[0033] The electric heater may comprise one or more external heating elements, one or more internal heating elements, or one or more external heating elements and one or more internal heating elements. As used herein, the term "external heating element" refers to a heating element positioned outside the aerosol-forming substrate of the aerosol-generating article received in the cavity. As used herein, the term "internal heating element" refers to a heating element positioned at least partially inside the aerosol-forming substrate of the aerosol-generating article received in the cavity. The at least one external heating element may comprise an array of external heating elements arranged around the periphery of the cavity, for example on the sidewall of the housing. In certain instances, the external heating element extends along the longitudinal direction of the cavity. In this arrangement, the heating element extends along the same direction that the aerosol-generating article is inserted into and removed from the cavity. This may reduce interference between the heating element and the aerosol-generating article when the article is inserted into and removed from the cavity, compared to an apparatus in which the heating element is not aligned with the length of the cavity. In some embodiments, the external heating element extends along the length of the cavity and is spaced apart circumferentially. Where the electric heater comprises at least one internal heating element, the heating element may comprise any suitable number of heating elements. For example, the heater may comprise a single internal heating element. The single internal heating element may extend along the longitudinal axis of the cavity.

[0034] The aerosol generating device is preferably portable. The aerosol generating device may be comparable in size to a conventional cigar or cigarette. The overall length of the aerosol generating device may be from about 30 mm to about 150 mm. The outer diameter of the aerosol generating device may be from about 5 mm to about 30 mm.

[0035] Where the aerosol generating device comprises an electric heater, the aerosol generating device may further comprise a power source for powering the electric heater. In such an embodiment, the housing may define at least one internal compartment in which the power source is located. The at least one internal compartment may be separate from the cavity. The cavity may form part of the at least one internal compartment.

[0036] The power source may be a battery, such as a rechargeable lithium ion battery. Alternatively, the power source may be another form of charge storage device, such as a capacitor. The power source may require recharging. The power source may have a capacity that allows for storage of sufficient energy for one or more substrate inhalation experiences. For example, the power source may have a capacity sufficient to allow continuous generation of aerosol for about 6 minutes, or a multiple of 6 minutes, corresponding to the typical time it takes to smoke one conventional cigarette. In another example, the power source may have a capacity sufficient to allow a predetermined number of puffs, or discontinuous activation of an electric heater.

[0037] In any of the above embodiments, the aerosol-generating device may comprise an electric heater configured to heat the aerosol-forming substrate to generate an aerosol. The electric heater may comprise at least one heating element and may be configured to heat the solid aerosol-forming substrate or the liquid aerosol-forming substrate. The at least one heating element may comprise one or more resistive heating elements. The at least one heating element may comprise one or more inductive heating elements. The at least one heating element may comprise one or more resistive heating elements and one or more inductive heating elements. The aerosol-generating device may further comprise a controller configured to control the supply of power to the heater. The controller may be configured to disable operation of the device by blocking the supply of power to the electric heater, and may enable operation of the device by enabling the supply of power to the electric heater.

[0038] At least one electric heating element preferably comprises an electrically resistive material. Suitable electrically resistive materials include, but are not limited to, semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, alloys, and composites of ceramic and metal materials. Such composites may include doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable alloys include stainless steel, constantan, nickel-containing, cobalt-containing, chromium-containing, aluminum-containing, titanium-containing, zirconium-containing, hafnium-containing, niobium-containing, molybdenum-containing, tantalum-containing, tungsten-containing, tin-containing, gallium-containing, manganese-containing, and iron-containing alloys, as well as nickel-, iron-, cobalt-, and stainless steel-based superalloys, Timetal®, iron-aluminum-based alloys, and iron-manganese-aluminum-based alloys. Timetal® is a registered trademark of Titanium Metals Corporation, 1999 Broadway Suite 4300, Denver Colorado. In composite materials, the electrically resistive material may be optionally embedded, encapsulated, or coated with an insulating material, or vice versa, depending on the required energy transfer kinetics and external physicochemical properties. The heating element may include a metallic etched foil insulated between two layers of inert material. In that case, the inert material may include Kapton®, an all-layer polyimide, or a mica foil. Kapton® is a registered trademark of EI du Pont de Nemours and Company, 1007 Market Street, Wilmington, Delaware 19898, United States of America.

[0039] The at least one electrical heating element may comprise an infrared heating element, a photon source, or an induction heating element.

[0040] The at least one electric heating element may take any suitable form. For example, the at least one electric heating element may take the form of a heating blade. The at least one electric heating element may take the form of a casing or base with different conductive parts or metal tubes of electrical resistance. If the aerosol-forming substrate is a liquid provided in the container, the container may incorporate a disposable heating element. Alternatively, one or more heating needles or rods may be used that penetrate the center of the aerosol-forming substrate. The at least one electric heating element may be a disk-shaped (end) heating element or a combination of a disk-shaped heating element and a heating needle or rod. The at least one electric heating element may comprise a flexible sheet of material arranged to surround or partially surround the aerosol-forming substrate. Other possibilities include heating wires or filaments, for example wires or heating plates made of Ni-Cr, platinum, tungsten or alloys. Optionally, the heating element may be arranged in or on a rigid carrier material.

[0041] The at least one electric heating element may include a heat sink or heat store, which comprises a material capable of absorbing and storing heat and then releasing it to the aerosol-forming substrate over a period of time. The heat sink may be formed of any suitable material, such as a suitable metal or ceramic material. The material is preferably a material that has a high heat capacity (sensible heat storage material) or has the ability to absorb heat and then release it via a reversible process (such as a high temperature phase change). Suitable heat store materials include silica gel, alumina, carbon, glass mat, glass fiber, minerals, metals or alloys (aluminum, silver or lead), and cellulosic materials (such as paper). Other materials that release heat by a reversible phase change include, for example, paraffin, sodium acetate, naphthalene, wax, polyethylene oxide, metals, metal salts, eutectic salt mixtures or alloys.

[0042] The heat sink or heat store may be in direct contact with the aerosol-forming substrate and positioned so as to be able to transfer the stored heat directly to the substrate. The heat stored in the heat sink or heat store may be transferred to the aerosol-forming substrate by means of a thermal conductor such as a metal tube.

[0043] At least one heating element may heat the aerosol-forming substrate by conduction. The heating element may be in at least partial contact with the substrate or with a carrier on which the substrate is disposed. Heat from the heating element may be conducted to the substrate by a thermally conductive element.

[0044] The at least one heating element may transfer heat to incoming ambient air drawn through the electrically heated aerosol generating device during use, which then heats the aerosol-forming substrate by convection. The ambient air may be heated before passing through the aerosol-forming substrate. If the aerosol-forming substrate is a liquid substrate, the ambient air may first be drawn through the substrate and then heated.

[0045] The at least one heating element may comprise an inductive heating element, such that no electrical contact is formed between the article and the device when the device forms part of an aerosol generation system consisting of an aerosol generating device and a removable aerosol-generating article. The device may comprise an inductor coil and a power source configured to provide a high frequency oscillating current to the inductor coil. The article may comprise a susceptor element positioned to heat the aerosol-forming substrate. The term high frequency oscillating current as used herein means an oscillating current having a frequency between 500 kHz and 10 MHz.

[0046] The housing may be elongated. The housing may comprise any suitable material or combination of materials. Suitable materials include, for example, metals, alloys, plastics, or composites containing one or more of these materials, or thermoplastics suitable for food or pharmaceutical applications, such as, for example, polypropylene, polyetheretherketone (PEEK), and polyethylene. Preferably, the material is lightweight and not brittle.

[0047] The housing may include a mouthpiece. The mouthpiece may include at least one air inlet and at least one air outlet. The mouthpiece may include two or more air inlets. The one or more air inlets may reduce the temperature of the aerosol before it is delivered to the user and may reduce the concentration of the aerosol before it is delivered to the user. As used herein, the term "mouthpiece" refers to a portion of the aerosol generating device that is placed in the mouth of a user to directly inhale the aerosol generated by the aerosol generating device from an aerosol-generating article received within the cavity of the housing.

[0048] According to a second aspect of the present invention there is provided an aerosol generating system comprising an aerosol generating article according to the first aspect of the present invention and an aerosol generating device according to any of the embodiments described above, wherein the aerosol generating article comprises an aerosol-forming substrate which is vaporised by the aerosol generating device in use to form an aerosol.

[0049] The term "aerosol-forming substrate" as used herein relates to a substrate capable of releasing volatile compounds capable of forming an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate. The aerosol-forming substrate may conveniently be part of an aerosol-generating article.

[0050] The term "aerosol-generating article" as used herein means an article comprising an aerosol-forming substrate capable of releasing a volatile compound capable of forming an aerosol. For example, the aerosol-generating article may be an article that generates an aerosol that can be directly inhaled into the lungs of a user by sucking or puffing on a mouthpiece at the proximal or user end of the system. The aerosol-generating article may be disposable. An article comprising an aerosol-forming substrate that contains tobacco is called a tobacco stick.

[0051] As used herein, the term "aerosol-generating device" refers to a device that interacts with an aerosol-generating article to generate an aerosol.

[0052] When the clamping member is in the open position, the minimum diameter of the cavity is equal to or greater than, preferably greater than, the maximum outer diameter of the aerosol-generating article.When the clamping member is in the clamped position, the minimum diameter of the cavity is equal to or less than, preferably less than, the maximum outer diameter of the aerosol-generating article.In any configuration, the minimum diameter of the cavity when the clamping member is in the open position is greater than the minimum diameter of the cavity when the clamping member is in the clamped position.

[0053] The aerosol generating system may include a user interface for activating the system, such as a button to initiate heating of the device, or a display that indicates the status of the device or the aerosol-forming substrate.

[0054] The aerosol-generating system may be an electrically heated system that heats an aerosol-forming substrate to generate the aerosol. The aerosol-forming substrate may be a liquid contained in a liquid reservoir, or may be a solid substrate. In either case, the aerosol-forming substrate may be provided in a replaceable, consumable portion that engages the device during use. The system may be a heated tobacco type system, in which the cigarette is heated without combustion to form an aerosol that can be directly inhaled by the user.

[0055] In a preferred embodiment, the aerosol generating system comprises an electric heater for heating the aerosol-forming substrate during use to generate the aerosol.

[0056] The electric heater may indirectly heat the aerosol-forming substrate. The electric heater may be an induction heater and the aerosol-generating article may further comprise a susceptor in thermal communication with the aerosol-forming substrate. During use, the susceptor is heated by the induction heater and the aerosol-forming substrate is heated by the susceptor. The susceptor may be configured to heat the aerosol-forming substrate by at least one of conductive heat transfer, convective heat transfer, radiative heat transfer, and combinations thereof.

[0057] The aerosol-generating article may be partially contained within an aerosol-generating device.

[0058] The aerosol-generating article may be substantially cylindrical in shape. The aerosol-generating article may be substantially elongated. The aerosol-generating article may also have a length and a circumference substantially perpendicular to the length. The aerosol-forming substrate may be substantially cylindrical in shape. The aerosol-forming substrate may be substantially elongated. The aerosol-forming substrate may also have a length and a circumference substantially perpendicular to the length.

[0059] The overall length of the aerosol-generating article may be from about 30 mm to about 100 mm. In one embodiment, the overall length of the aerosol-generating article is about 45 mm. The outer diameter of the aerosol-generating article may be from about 5 mm to about 12 mm. In one embodiment, the aerosol-generating article may have an outer diameter of about 7.2 mm.

[0060] The aerosol-forming substrate may have a length of about 7 mm to about 15 mm. In one embodiment, the aerosol-forming substrate may have a length of approximately 10 mm. Alternatively, the aerosol-forming substrate may have a length of approximately 12 mm.

[0061] The aerosol-generating substrate preferably has an outer diameter approximately equal to the outer diameter of the aerosol-generating article. Further, the outer diameter of the aerosol-forming substrate may be from about 5 mm to about 12 mm. In one embodiment, the aerosol-forming substrate may have an outer diameter of about 7.2 mm.

[0062] The aerosol-generating article may include a filter plug. The filter plug may be located at a downstream end of the aerosol-generating article. The filter plug may be a cellulose acetate filter plug. In one embodiment, the length of the filter plug is approximately 7 mm, but may be from approximately 5 mm to approximately 10 mm.

[0063] The aerosol-generating article may comprise an outer paper wrapper. Additionally, the aerosol-generating article may comprise a separation between the aerosol-forming substrate and the filter plug. The separation may be approximately 18 mm, but may range from approximately 5 mm to approximately 25 mm.

[0064] The aerosol-forming substrate may be a solid aerosol-forming substrate. Alternatively, the aerosol-forming substrate may comprise both solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material that includes volatile tobacco flavour compounds that are released from the substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may further comprise an aerosol former that promotes the formation of a dense and stable aerosol. Examples of suitable aerosol formers are glycerin and propylene glycol.

[0065] In a particularly preferred embodiment, the aerosol-forming substrate comprises an assemblage of a crimped sheet of homogenized tobacco material. As used herein, the term "crimped sheet" means a sheet having a plurality of substantially parallel ridges or wrinkles.

[0066] The aerosol-generating article may comprise a liquid reservoir and a liquid aerosol-forming substrate stored in the liquid reservoir. In use, the electric heater heats a small portion of the liquid aerosol-forming substrate to vaporize the small portion. The liquid aerosol-forming substrate preferably comprises a tobacco-containing material that includes volatile tobacco flavour compounds that are released from the liquid upon heating. Alternatively, or in addition, the liquid aerosol-forming substrate may comprise a non-tobacco material. The liquid aerosol-forming substrate may include water, solvents, ethanol, plant extracts, and natural or artificial flavours. Preferably, the liquid aerosol-forming substrate further comprises an aerosol former.

[0067] As used herein, the term "aerosol former" is used to describe any suitable known compound or mixture of compounds that facilitates the formation of an aerosol upon use. Suitable aerosol formers are preferably substantially resistant to thermal decomposition at the operating temperature of the aerosol-generating article. Examples of suitable aerosol formers are glycerin and propylene glycol.

[0068] The aerosol-generating article may further comprise a capillary wick in communication with the liquid storage portion. The capillary wick is arranged to contact a liquid aerosol-forming substrate in the liquid storage portion. In use, the liquid aerosol-forming substrate is transferred from the liquid storage portion along the capillary wick by capillary action, where it is heated by the electric heater. In embodiments in which the electric heater comprises an induction heater, the aerosol-generating article may further comprise a susceptor. In use, the induction heater heats the susceptor, and the liquid aerosol-forming substrate is transferred from the liquid storage portion to the susceptor via the capillary wick.

[0069] An aerosol generating system is a combination of an aerosol generating device and one or more aerosol generating articles for use with the aerosol generating device, although the aerosol generating system may also include additional components, such as a charging unit for recharging an on-board power supply in an electrically operated or electric aerosol generating device.

[0070] Features described with respect to one or more aspects may equally be applied to the other aspects of the invention, in particular features described in relation to the apparatus of the first aspect may equally be applied to the system of the second aspect and vice versa.

[0071] The invention will now be further described, by way of example only, with reference to the accompanying drawings in which: [Brief description of the drawings]

[0072] [Figure 1A] FIG. 1A shows a schematic diagram of an aerosol generating device according to a first embodiment of the present invention. [Figure 1B] FIG. 1B is a perspective view of the aerosol generating device of FIG. 1A, showing the clamping member in an open position. [Figure 1C] FIG. 1C is a perspective view of the aerosol generating device of FIG. 1A, showing the clamping member in a clamped position. [Figure 1D] FIG. 1D is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 1A-1C, showing the clamping member in the clamped position prior to insertion of an aerosol-generating article into the cavity. [Figure 1E] FIG. 1E is a schematic longitudinal cross-sectional view of the upstream end of the aerosol generating device of FIGS. 1A-1C, showing the clamping member in an open position during insertion of an aerosol-generating article into the cavity. [Figure 1F] FIG. 1F is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 1A-1C, showing the clamping member in the clamped position after an aerosol-generating article has been inserted into the cavity. [Figure 2A] FIG. 2A is a perspective view of an aerosol generating device according to a second embodiment of the present invention, showing a clamping member in an open position. [Figure 2B] FIG. 2B is a perspective view of an aerosol generating device according to a second embodiment of the present invention, showing the clamping member in the clamped position. [Figure 2C]FIG. 2C is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 2A and 2B, showing the clamping member in the clamped position prior to insertion of the aerosol-generating article into the cavity. [Figure 2D] FIG. 2D is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 2A and 2B, showing the clamping member in an open position during insertion of an aerosol-generating article into the cavity. [Figure 2E] FIG. 2E is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 2A and 2B, showing the clamping member in the clamped position after an aerosol-generating article has been inserted into the cavity. [Figure 3A] FIG. 3A is a perspective view of an aerosol generating device according to a third embodiment of the present invention, showing a clamping member in an open position. [Figure 3B] FIG. 3B is a perspective view of an aerosol generating device according to a third embodiment of the present invention, showing the clamping member in the clamped position. [Figure 3C] FIG. 3C is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 3A and 3B, showing the clamping member in the clamped position prior to insertion of the aerosol-generating article into the cavity. [Figure 3D] FIG. 3D is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 3A and 3B, showing the clamping member in an open position during insertion of an aerosol-generating article into the cavity. [Figure 3E] FIG. 3E is a schematic longitudinal cross-sectional view of the upstream end of the aerosol-generating device of FIGS. 3A and 3B, showing the clamping member in a clamped position after an aerosol-generating article has been inserted into the cavity. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0073] With reference to Figure 1A, the components of an electrically heated aerosol generating device 100 according to a first embodiment of the present invention are shown in a simplified manner. In particular, the elements of the electrically heated aerosol generating device 100 are not shown to scale in Figure 1. Elements that are not relevant to the understanding of the device have been omitted to simplify Figure 1A.

[0074] The electrically heated aerosol generating device 100 comprises a housing 110 defining a cavity for receiving an aerosol-generating article 10 (e.g., a tobacco stick). The aerosol-forming article 10 includes an aerosol-forming substrate that is pressed within the cavity of the housing 110 into thermal proximity with a heater 120. The aerosol-forming substrate emits a variety of volatile compounds at different temperatures.

[0075] Within the housing 110 is an electrical energy source 130, such as a rechargeable lithium ion battery. A controller 140 is connected to the heater 120, the electrical energy source 130, and a user interface 150 (e.g., a button to start heating the device and a display indicating the status of the device or the aerosol-forming substrate). The controller 140 controls the power supplied to the heater 120 to regulate its temperature. Typically, the aerosol-forming substrate is heated to a temperature between 250 and 450°C. By controlling the maximum operating temperature of the electrically heated aerosol generating device 100, the emission of undesirable volatile compounds can be controlled.

[0076] 1B-1F, the housing is formed from a body 112 and a movable wall 114 connected to the body 112 and located at the upstream end of the device 100. The body 112 houses an electrical energy supply, a controller, and a user interface. The movable wall 114 defines a cavity 116 in which the aerosol-generating article 10 is received. An electric heater 120 is positioned within the cavity 116. In this example, the electric heater comprises an internal heating element in the form of a heater blade 120 arranged to penetrate the aerosol-generating article 10 received in the cavity 116 and heat the aerosol-forming substrate from within.

[0077] The aerosol generating device 100 further comprises a clamping member in the form of a tubular collar 160 extending around the movable wall 114 at the upstream end of the housing 110. The tubular collar 160 is slidably connected to the housing 110 such that the tubular collar 160 is movable along the length of the housing 110 between an open position (shown in FIG. 1B) and a clamped position (shown in FIG. 1C). When in the open position, the downstream end of the collar 160 is received within a recess 119 in the body 112 of the housing 110. The collar 160 is connected to the body 112 of the housing 110 by a spring 170 arranged to bias the collar 160 towards the clamped position, as shown in FIG. 1C.

[0078] The movable wall 114 is resilient and is fixed to the body 112 such that the open end of the recess 116 has a first minimum diameter 117 when the movable wall 114 is in a first position, as shown in Figure 1E. Because the movable wall 114 is resilient, it can be elastically deflected relative to the body 112 to change the diameter of the open end of the recess 116 before automatically returning under the action of its own restoring force to its first position when the deflecting force is removed.

[0079] The collar 160 and the movable wall 114 are sized such that the movable wall 114 is undeflected by the collar 160 when the collar 160 is in the open position and is deflected radially inwardly by the collar 160 when the collar 160 is moved toward the clamping position. Thus, when the clamping member 160 is in the open position, the movable wall 114 is in a first position as shown in FIG. 1E, and when the clamping member 160 is in the clamping position, the movable wall 114 is deflected to a second position in which the open end of the recess 116 has a second minimum diameter 118 as shown in FIGS. 1D and 1F. The second minimum diameter 118 is smaller than the first minimum diameter 117. The collar 160 is thus operable to selectively clamp the open end of the recess 116 by deflecting the movable wall 114 to its second position.

[0080] The use of the device 100 will now be described with reference to Figures 1D-1F.

[0081] 1D, collar 160, in its initial state, is biased by spring 170 toward its clamped position, and movable wall 114 is deflected to its second position by collar 160. The open end of recess 116 is thus clamped by movable wall 114 and collar 160 when collar 160 is in the clamped position.

[0082] To insert the aerosol-generating article 10 into the cavity 116, the collar 160 is slid by the user against the action of the spring 170 towards the downstream end of the device to its open position, as shown in FIG. 1E. In this position, the collar 160 is partially received in the recess 119 and no longer deflects the movable wall 114 inwardly. As a result, the movable wall 114 automatically returns to its first position. Thus, the open end of the cavity 116 is enlarged when the collar 160 is in its open position. This stretching of the open end of the cavity 116 makes it easier for the user to insert the article 10 into the device 100. The article 10 is then inserted into the cavity such that the aerosol-forming substrate of the aerosol-generating article 10 is pierced by the heating blade 120.

[0083] Once the article 10 is fully inserted into the recess 160, the collar 160 is released by the user, allowing the spring 170 to automatically return the collar 160 to the clamped position, and thus deflect the movable wall 114 to its second position, as shown in FIG. 1F. The movable wall 114 and collar 160 are sized such that the second minimum diameter 118 is the same size as or smaller than the outer diameter of the aerosol-generating article. Thus, the aerosol-generating article 10 is automatically gripped by the movable wall 114 within the recess 116. This reduces the risk of accidental dislodging of the article 10 within the recess 116 and allows the relative positions of the aerosol-generating article 10 and the heater 120 to be maintained for consistent aerosol characteristics.

[0084] When the article 10 is consumed, it can be removed by pulling it out of the recess 116 with the collar 160 in the clamped position, or by moving the collar 160 to its open position to enlarge the open end of the recess 116 so that the article 10 can be more easily pulled out of the recess 116.

[0085] 2A-2E, an electrically heated aerosol generating device 200 according to a second embodiment of the present invention is shown. The second embodiment of the aerosol generating device 200 is similar in structure and operation to the first embodiment of the aerosol generating device 100 shown in FIGS. 1B-1F, and like reference numerals are used where identical features are present. However, the electric heater in the second embodiment of the aerosol generating device 200 is an external heater, comprising a plurality of heating elements 220 arranged on the inner surface of the movable wall 214 such that the heating elements 220 are around the periphery of the recess 216. In this arrangement, the heating elements 220 are positioned outside the aerosol-forming substrate of the aerosol-generating article 10 when the recess 216 is received. In this example, the heating elements 220 extend along the length of the aerosol generating device 200 and are spaced circumferentially around the inner surface of the movable wall 214. In this arrangement, the heating elements are arranged perpendicular to the direction of deflection of the movable wall 214. This reduces the force required to deflect the heating element when the moveable wall is deflected into a configuration where, for example, the heating element extends in a ring around the perimeter of the cavity, although it will be understood that other configurations of the external heater are contemplated and may be suitable.

[0086] The use of the device 200 will now be described with reference to Figures 2C-2E.

[0087] 2C, in its initial state, collar 260 is biased by spring 270 toward its clamped position and movable wall 214 is deflected to its second position by collar 260. The open end of recess 216 is thus clamped by movable wall 214 and collar 260 when collar 260 is in the clamped position.

[0088] To insert the aerosol-generating article 10 into the recess 216, the collar 260 is slid by the user against the action of the spring 270 towards the downstream end of the device to its open position, as shown in FIG. 2D. In this position, the collar 260 is partially received in the recess 219 and no longer deflects the movable wall 214 inwardly. This allows the movable wall 214 to automatically return to its first position. Thus, the open end of the recess 216 expands when the collar 260 is in its open position. This expansion of the open end of the recess 216 makes it easier for the user to insert the article 10 into the device 200. The article 10 is then inserted into the recess until the downstream end of the article 10 reaches the downstream end of the recess 216.

[0089] Once the article 10 is fully inserted into the recess 260, the collar 260 is released by the user, allowing the spring 270 to automatically return the collar 260 to the clamped position, and thus deflect the movable wall 214 to its second position, as shown in Figure 2E. The movable wall 214, the heating element 220 and the collar 260 are sized such that the second minimum diameter 218 is the same size as or smaller than the outer diameter of the aerosol-generating article 10. Thus, the aerosol-generating article 10 is automatically gripped within the recess 216 when the collar 260 is released by the user. This reduces the risk of accidental dislodging of the article 10 within the recess 216 and allows the relative positions of the aerosol-generating article 10 and the heater 220 to be maintained. Furthermore, with the heating element 220 positioned on the inner surface of the movable wall 214, the heating element 220 is pressed against the aerosol-generating article 10 by the movable wall 214 when the collar 260 is in the clamped position. This can help improve heat transfer from the heating element 220 to the aerosol-forming substrate of the aerosol-generating article 10 for consistent aerosol characteristics.

[0090] When the article 10 is consumed, it can be removed by pulling it out of the recess 216 with the collar 260 in the clamped position, or by moving the collar 260 to its open position to enlarge the open end of the recess 216 so that the article 10 can be more easily pulled out of the recess 216.

[0091] 3A-3E, an electrically heated aerosol generating device 300 according to a third embodiment of the present invention is shown. The third embodiment of the aerosol generating device 300 is similar in structure and operation to the second embodiment of the aerosol generating device 200 shown in FIGS. 2A-2E, and similar reference numbers are used where identical features are present. However, in the third embodiment of the aerosol generating device 300, the movable wall 314 defines only the upstream end of the cavity 316. The remaining portion of the cavity 316 is defined by a fixed wall 313 that is fixed to the body 312 of the housing 310. The movable wall 314 is connected to the fixed wall 313 by a hinge 315. In this example, the fixed wall 313 and the movable wall 314 are integral, and the hinge 315 is formed from a region of the housing of a smaller thickness that allows the movable wall 314 to pivot relative to the fixed wall 313 by elastic deformation at the hinge 315. In other examples, the fixed wall 313, the movable wall 314, and the hinge 315 may be separate components. Unlike the second embodiment of the aerosol generating device 200, in the third embodiment of the aerosol generating device 300, the multiple external heating elements 320 are disposed on the inner surface of the fixed wall 313, rather than on the movable wall 314. Furthermore, because the movable wall 314 is located only at the upstream end of the recess 316, the collar 360 may be shorter, as shown in FIGS. 3A-3E. As a result, the third embodiment of the aerosol generating device 300 does not have a recess in which the collar 360 can be received when in the open position. Instead, the collar 360 remains upstream of the body 312 and slides on the outside of the fixed wall 313 and the movable wall 314. From this point on, the spring 370 is fixed to the fixed wall 313, rather than in the body 312 as in the first and second embodiments. Nevertheless, the spring 370 is still positioned between the collar 360 and the housing 310. The collar 360 is shorter than in the first and second embodiments, but this is not essential. Instead, in other examples, the collar may have a length that is the same as or longer than that of the collar in the first and second embodiments, and may be received in a recess in the body of the housing or slidable over the outer surface of the body.

[0092] The above specific embodiments and examples illustrate the invention but do not limit it. It will be appreciated that other embodiments of the invention may be made and the specific embodiments and examples described herein are not intended to be exhaustive.

Claims

1. An aerosol generating device, comprising: a housing defining a cavity for receiving an aerosol-generating article, said cavity having an open end through which said article can be received in said cavity; a clamping member connected to the housing, the clamping member being movable between an open position and a clamping position to selectively clamp at least a portion of the recess; an electric heater positioned within the cavity for heating the aerosol-forming substrate when an aerosol-generating article is received within the cavity, the electric heater comprising one or more external heating elements, the one or more external heating elements being positioned within the cavity such that they are external to the aerosol-forming substrate of the aerosol-generating article when the aerosol-generating article is received within the cavity; Equipped with An aerosol generating device, wherein the housing comprises a body and a movable wall connected to the body, the movable wall defining at least a portion of the open end of the recess, the movable wall being movable between a first position in which the open end has a first minimum diameter and a second position in which the open end has a second, smaller minimum diameter, and the clamping member is positioned to selectively clamp the open end of the recess by deflecting the movable wall to the second position.

2. 2. The aerosol generating device of claim 1, wherein the clamping member is selectively movable between the open position and the clamping position when an aerosol-generating article is received in the recess to selectively clamp at least a portion of the recess.

3. 3. The aerosol generating device according to claim 1, wherein the clamping member is biased towards the clamped position.

4. An aerosol generating device as described in any one of claims 1 to 3, further comprising a spring between the housing and the fastening member, the spring being arranged to urge the fastening member towards the fastening position.

5. An aerosol generating device according to any one of claims 1 to 4, wherein the fastening member comprises a collar extending around the outside of the recess in the housing.

6. An aerosol generating device as described in any one of claims 1 to 5, wherein the fastening member is slidably connected to the housing such that it is movable along the length of the housing.

7. 7. The aerosol generating device of claim 6, wherein the housing further comprises a recess for receiving at least a portion of the clamping member when the clamping member is in the open position.

8. An aerosol generating device according to any one of claims 1 to 7, wherein the movable wall is biased towards the first position when the fastening member is in the open position.

9. An aerosol generating device as described in any one of claims 1 to 8, wherein the movable wall is elastic and is arranged to bend relative to the main body of the housing by elastic deformation when the clamping member is moved to the clamping position and to move to the second position, and to automatically return to the first position when the clamping member is moved to the open position.

10. An aerosol generating device as described in any one of claims 1 to 8, wherein the movable wall is connected to the main body of the housing by a hinge around which the movable wall is movable between the first position and the second position.

11. 11. An aerosol generating device according to any one of claims 1 to 10, wherein the electric heater further comprises one or more internal heating elements.

12. 12. An aerosol generating device according to any one of claims 1 to 11, wherein the electric heater comprises a plurality of external heating elements arranged around a periphery of the cavity.

13. The aerosol generating device of claim 12 , wherein the plurality of external heating elements extend along the longitudinal axis of the cavity.

14. An aerosol generating device as described in any one of claims 1 to 13, wherein the electric heater comprises a plurality of external heating elements arranged around a periphery of the recess, the plurality of external heating elements being arranged on an inner surface of the movable wall.

15. An aerosol generating system comprising an aerosol generating device according to any one of claims 1 to 14, and an aerosol-generating article for use with the aerosol generating device, the aerosol-generating article comprising an aerosol-forming substrate.

16. 16. The aerosol generating system of claim 15, wherein the aerosol-forming substrate comprises a tobacco-containing material that includes volatile tobacco flavor compounds that are released from the substrate upon heating.

17. 17. The aerosol generation system of claim 15 or 16, further comprising a user interface for activating the aerosol generation system.

Images