Abstract
An induction heating assembly for an aerosol generating device includes a heating chamber for receiving, in use, an aerosol generating article, and an induction coil assembly. The induction coil assembly substantially surrounds the heating chamber and includes an electrically insulating layer and an electrically conductive track. The induction coil assembly has a substantially tubular construction and at least part of the induction coil assembly overlaps with another part of the induction coil assembly in an axial direction.
Claims
1. An induction heating assembly for an aerosol generating device, the induction heating assembly comprising a heating chamber for receiving, in use, an aerosol generating article, and an induction coil assembly substantially surrounding the heating chamber, the induction coil assembly comprising an electrically insulating layer and an electrically conductive track, wherein the induction coil assembly has a substantially tubular construction and wherein at least part of the induction coil assembly overlaps with another part of the induction coil assembly in an axial direction.
2. The induction heating assembly according to claim 1, wherein the induction coil assembly has a spiral construction.
3. The induction heating assembly according to claim 1, further comprising a connector leg electrically connected to an end of the electrically conductive track and which projects from the electrically conductive track.
4. The induction heating assembly according to claim 3, further comprising a base that supports an axial end of the induction coil assembly.
5. The induction heating assembly according to claim 4, wherein the base comprises a slot or opening for receiving the connector leg.
6. The induction heating assembly according to claim 1, further comprising an electromagnetic shield that substantially surrounds the induction coil assembly.
7. The induction heating assembly according to claim 6, wherein there is a gap between the induction coil assembly and the electromagnetic shield.
8. An induction heating assembly for an aerosol generating device, the induction heating assembly comprising a heating chamber for receiving, in use, an aerosol generating article, and an induction coil assembly substantially surrounding the heating chamber, the induction coil assembly comprising an electrically conductive track, wherein at least part of the electrically conductive track overlaps with another part of the electrically conductive track in an axial direction.
9. The induction heating assembly according to claim 8, wherein the induction coil assembly comprises an electrically insulating layer that is located at least between the overlapping parts of the electrically conductive track.
10. A method of manufacturing an induction heating assembly comprising the steps of: forming a heating chamber; and forming or positioning an induction coil assembly substantially around the heating chamber, the induction coil assembly comprising (i) an electrically insulating layer and an electrically conductive track, wherein the induction coil assembly has a substantially tubular construction and wherein at least part of the induction coil assembly overlaps with another part of the induction coil assembly in an axial direction, or (ii) an electrically conductive track, wherein at least part of the electrically conductive track overlaps with another part of the electrically conductive track in an axial direction.
11. The method according to claim 10, wherein the step of forming or positioning the induction coil assembly comprises winding the electrically insulating layer and/or the electrically conductive track around the heating chamber such that the induction coil assembly has a spiral construction.
12. The method according to claim 11, wherein the heating chamber is defined by one or more walls of a support, wherein the electrically insulating layer and/or the electrically conductive track is/are wound around the one or more walls, and wherein the support comprises at least one flange that extends outwardly from the one or more walls and guides the electrically insulating layer and/or the electrically conductive track during the winding process.
13. The method according to claim 10, wherein the induction coil assembly comprises a connector leg electrically connected to an end of the electrically conductive track and wherein the step of forming or positioning the induction coil assembly is carried out so that the connector leg projects from the electrically conductive track.
14. The method according to claim 13, further comprising the step of electrically connecting the connector leg to a connector of a body assembly of an aerosol generating device.
15. The method according to claim 10, further comprising the step of forming or positioning an electromagnetic shield substantially around the induction coil assembly.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0055] FIG. 1 is a diagrammatic cross-sectional view of an embodiment of an induction heating assembly;
[0056] FIG. 2 is a diagrammatic cross-sectional view of the embodiment of the induction heating assembly of FIG. 1 along line A-A;
[0057] FIG. 3 is a diagrammatic cross-sectional view of the embodiment of the induction heating assembly of FIG. 2 along line B-B;
[0058] FIG. 4 is a diagrammatic cross-sectional view of the embodiment of the induction heating assembly of FIG. 2 along line C-C;
[0059] FIG. 5 is a diagrammatic view of a first embodiment of an induction coil assembly before it is wound;
[0060] FIG. 6 is a diagrammatic cross-sectional view of an embodiment of an aerosol generating device before an induction heating assembly is connected to a body assembly and before an aerosol generating article is received in the induction heating assembly;
[0061] FIG. 7 is a diagrammatic cross-sectional view of the aerosol generating device of FIG. 6 with the induction heating assembly connected to the body assembly and the aerosol article received in the induction heating assembly;
[0062] FIG. 8 is a diagrammatic view of a second embodiment of an induction coil assembly before it is wound;
[0063] FIG. 9 is a diagrammatic cross-sectional view of an embodiment of an induction heating assembly comprising the induction coil assembly of FIG. 8;
[0064] FIG. 10 is a diagrammatic view of a third embodiment of an induction coil assembly before it is wound;
[0065] FIG. 11 is a diagrammatic cross-sectional view of an embodiment of an induction heating assembly comprising the induction coil assembly of FIG. 10;
[0066] FIG. 12 is a diagrammatic view of a fourth embodiment of an induction coil assembly before it is wound;
[0067] FIG. 13 is a diagrammatic cross-sectional view of an embodiment of an induction heating assembly comprising the induction coil assembly of FIG. 12;
[0068] FIG. 14 is a diagrammatic view of a fifth embodiment of an induction coil assembly before it is wound;
[0069] FIG. 15 is a diagrammatic cross-sectional view of an embodiment of an induction heating assembly comprising the induction coil assembly of FIG. 14;
[0070] FIG. 16 is a diagrammatic view of a sixth embodiment of an induction coil assembly before it is wound;
[0071] FIG. 17 is a diagrammatic cross-sectional view of an embodiment of an induction heating assembly comprising the induction coil assembly of FIG. 16;
[0072] FIG. 18 is a diagrammatic cross-sectional view of a seventh embodiment of an induction coil assembly before it is wound; and
[0073] FIG. 19 is a circuit diagram of part of an electronic circuit of an aerosol generating device.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0074] Embodiments of the present disclosure will now be described by way of example only and with reference to the accompanying drawings.
[0075] Referring to FIGS. 1 to 4, there is shown diagrammatically an induction heating assembly 1 according to an embodiment of the disclosure.
[0076] The induction heating assembly 1 comprises a support 2 having a substantially cylindrical wall 4 that defines a heating chamber 6. The support 2 includes a base 8 that defines the bottom of the heating chamber 6 and which includes a radially outwardly extending flange 8a. An air inlet 10 is formed in the base 8 at the bottom of the heating chamber 6.
[0077] The support 2 also includes a top 12 that defines an opening of the heating chamber 6 and which includes a radially outwardly extending flange 12a.
[0078] The support 2 is integrally formed from a plastics material such as polyether ether ketone (PEEK), for example.
[0079] The induction heating assembly 1 comprises an induction coil assembly 14. The induction coil assembly 14 has a spiral construction that will be described in more detail below and generally takes the form of an open-ended tube with a substantially circular cross section. The induction coil assembly 14 is mounted on the support 2 and surrounds the heating chamber 6. More particularly, the induction coil assembly 14 is positioned radially outside the substantially cylindrical wall 4 defining the heating chamber 6 and axially between the flanges 8a, 12a of the base and top of the support. The axial ends 14a, 14b of the induction coil assembly 14 are supported by oppositely facing annular flange surfaces 8b, 12b of the base and top as shown.
[0080] A substantially cylindrical electromagnetic shield 16 substantially surrounds the induction coil assembly 14. The base 8 includes an annular flange surface 8c that supports an axial end 16a of the electromagnetic shield 16. A radial gap 18 is maintained between the induction coil assembly 14 and the electromagnetic shield 16 to provide thermal insulation between the components and to ensure a desired field distribution of the generated electromagnetic field within the heating chamber 6. The gap 18 between the induction coil assembly 14 and the electromagnetic shield 16 is maintained by circumferentially spaced spacers in the form of four radially inwardly extending protrusions 20 formed on the radially inner surface of the electromagnetic shield at a top part of the electromagnetic shield and four radially inwardly extending protrusions 20 formed on the radially inner surface of the electromagnetic shield at a bottom part of the electromagnetic shield. The bottom protrusions 20 are in contact with the substantially cylindrical radially outer surface of the flange 8a and the top protrusions 20 are in contact with the substantially cylindrical radially outer surface of the top 12a as shown in FIGS. 1 and 4. In an alternative embodiment, the spacers may be formed on the base of the support, for example. The induction coil assembly 14 may be secured or fixed to the support 2, for example by a suitable adhesive, to maintain the induction coil assembly in position relative to the heating chamber 6.
[0081] Referring also to FIG. 5, which shows diagrammatically the induction coil assembly 14 before it is wound into the spiral construction, the induction coil assembly comprises a strip 22 of electrically conductive material that is bonded or fixed to an electrically insulating layer 24. The electrically conductive material may be a metal such as copper, stainless steel or aluminium, for example. The electrically insulating layer 24 may be a polyamide or polyimide layer, for example. The strip 22 extends along the length of the unwound electrically insulating layer 24, i.e., from a first end 24a to a second end 24b. It will be readily understood that the direction along the length of the unwound induction coil assembly 14 shown in FIG. 5 corresponds to the circumferential direction of the induction coil assembly when wound into the spiral construction. Similarly, the direction along the width of the unwound induction coil assembly 14 shown in FIG. 5 corresponds to the axial direction of the induction coil assembly when wound into the spiral construction.
[0082] In one embodiment, the induction coil assembly 14 is formed from a copper strip that is about 0.2 mm thick and about 6.5 mm wide that is bonded or fixed to a polyimide (Kapton®) tape with a suitable adhesive.
[0083] FIGS. 1 and 2 show diagrammatically the induction coil assembly 14 after it has been wound into the spiral construction. The strip 22 of electrically conductive material and the electrically conductive layer 24 to which it is bonded or fixed are wound around the heating chamber 6 at a continuously increasing distance from the central axis of the induction coil assembly. Each turn of the induction coil assembly 14 overlaps fully with the preceding turn to form the spiral construction. Part of the induction coil assembly 14 overlaps with another part of the induction coil assembly in the axial direction.
[0084] The induction coil assembly 14 may be wound in situ around the substantially cylindrical wall 4 of the support 2 with the strip 22 and the electrically insulating layer 24 being guided during the winding process by the facing annular flange surfaces 8b, 12b. In this embodiment the support 2 is acting as a coil former. Alternatively, if the support is suitably modified, the induction coil assembly may be pre-formed and then positioned around the heating chamber 6.
[0085] In the wound induction coil assembly 14, the axial position of the strip 22 of electrically conductive material does not change along the circumferential direction of the induction coil assembly 14. The strip 22 winds around the heating chamber 6 at a continuously increasing distance from the central axis of the induction coil assembly and each turn overlaps fully with the preceding turn to form the spiral construction. The strip 22 of electrical conductive material defines an induction coil. Although the strip 22 is only bonded or fixed on one side to the electrically insulating layer 24, it can be seen from FIG. 2, in particular, that the spiral construction of the induction coil assembly 14 as a whole means that adjacent turns of the strip 22 are insulated from each other by the interposing electrically insulating layer 24.
[0086] A first connector leg 26 projects from a first end 22a of the strip 22 and a second connector leg 28 projects from a second end 22b of the strip. The first and second connector legs 26, 28 project beyond the induction coil assembly 14 in the axial direction as shown. The first connector leg 26 is located at the radially innermost part of the wound strip 22 and the second connector leg 28 is located at the radially outermost part of the wound strip. Referring to FIG. 2, during the winding process, the unwound induction coil assembly 14 may be positioned with the first end 22a of the strip 22 adjacent the substantially cylindrical wall 4 and spaced apart therefrom by the electrically insulating layer 24 and the strip and the electrically insulating layer are then wound together around the substantially cylindrical wall 4 in a counter-clockwise direction.
[0087] The first and second connector legs 26, 28 pass through slots 30 formed in the base 8 of the support 2.
[0088] The induction coil assembly 14 has 4.5 turns, i.e., it extends four and a half times around the heating chamber 6. The half turn means that the first and second connector legs 26, 28 are conveniently positioned diametrically opposite each other. The slots 30 are also formed diametrically opposite to each other in the base 8.
[0089] Referring to FIGS. 6 and 7, there is shown diagrammatically an aerosol generating device 100 according to an embodiment of the disclosure. The induction heating assembly 1 described above with reference to FIGS. 1 to 5 forms part of the aerosol generating device 100. The aerosol generating device 100 further comprises a body assembly 102 with a controller (e.g., a digital controller) 104 and a power source 106 such as a rechargeable battery.
[0090] The body assembly 102 includes a first connector 108 and a second connector 110. The first and second connectors 108, 110 are adapted to be engaged with the first and second connector legs 26, 28 of the induction coil assembly 14 to provide an electrical connection between the body assembly 102 and the induction heating assembly 1. The induction heating assembly 1 may be designed to be releasably connected to the body assembly 102 (e.g., to permit a replacement induction heating assembly to be fitted) and in this case the engagement between the first and second connectors 108, 110 and the first and second connector legs 26, 28 may be releasable engagement. The first and second connector legs 26, 28 may be provided with a first type of connector end and the first and second connectors 108, 110 may be provided with a second type of connector end that is engageable with the first type of connector end. FIG. 7 shows diagrammatically how the induction heating assembly 1 may be connected to the body assembly 102 with the first connector leg 26 engaged with the first connector 108 and the second connector leg 28 engaged with the second connector 110. An electrical connection is therefore provided between the induction coil assembly 14 (and in particular, the strip 22 of electrically conductive material that defines the induction coil) and the controller 104 and the power source 106 of the body assembly 102. The induction coil assembly 14 may therefore be controlled by the controller 104 to generate an electromagnetic field for heating one or more susceptors in an aerosol generating article by inducing eddy current and/or magnetic hysteresis losses in the susceptors.
[0091] An example of one type of aerosol generating article 200 is shown diagrammatically in FIGS. 6 and 7. In FIG. 7 the aerosol generating article 200 is received in the heating chamber 6 of the induction heating assembly 1 where it can be heated. The aerosol generating article 200 comprises a body of aerosol forming material 204. The aerosol forming material 204 comprises one or more susceptors (not shown) and releases volatile compounds upon heating. The volatile compounds may include nicotine or flavour compounds such as tobacco flavouring. The aerosol generating article 200 is substantially cylindrical in shape and the aerosol forming material 204 is held inside a tube 206 of air impermeable material such as paper, for example.
[0092] A filter 208 is provided at one end of the aerosol forming article 200 through which a user may inhale the aerosol released on heating. The filter 208 is spaced apart from the body of aerosol forming material 204 by a cooling space 210. An air permeable filter or cap 212 is provided at the other end of the aerosol generating article 200 to contain the aerosol forming material 204. In use, when the aerosol generating article 200 is received in the heating chamber 6, the filter or cap 212 is positioned adjacent the base 8 of the support 2 as shown diagrammatically in FIG. 7. Air may be drawn through the air inlet 10 and into the aerosol generating article 200 through the filter or cap 212.
[0093] The depth D of the heating chamber 6 may be defined as its dimension in the axial direction of the induction heating assembly 1 that overlaps with the body of aerosol forming material 204 when the aerosol generating article 200 is received in the heating chamber 6. The width of the unwound strip 22 of electrically conductive material defines the axial height of the wound induction coil and may be substantially equal to, or greater than, half of the depth D to provide effective heating of the aerosol forming material 204. In the induction coil assembly 14 shown diagrammatically in FIGS. 1 to 7, the axial height of the strip 22 of electrically conductive material remains the same along the circumferential direction of the induction coil assembly 14. This is most clearly shown in FIG. 5 where the width W of the unwound strip 22 is shown to be slightly less than the width of the unwound electrically insulating layer 24 and remains substantially the same along the full length of the electrically insulating layer, i.e., from the first end 24a to the second end 24b, and hence along the circumferential direction of the wound induction coil assembly 14.
[0094] In FIGS. 8 and 9 there is shown diagrammatically an induction coil assembly 32 according to a second embodiment of the disclosure. The induction coil assembly 32 is similar to the induction coil assembly 14 described with reference to FIGS. 1 to 7 and like parts have been given the same reference sign. In the induction coil assembly 32 the axial height of a strip 34 of electrically conductive material is substantially the same as the height of an electrically insulating layer 24, thereby providing a construction that is easy to manufacture. This is most clearly shown in FIG. 8 where the width of the unwound strip 34 is shown to be the same as the width of the unwound electrically insulating layer 24 and remains substantially the same along the full length of the electrically insulating layer, and hence along the circumferential direction of the wound induction coil assembly 32.
[0095] In FIGS. 10 and 11 there is shown diagrammatically an induction coil assembly 36 according to a third embodiment of the disclosure. The induction coil assembly 36 is similar to the induction coil assemblies 14, 32 described with reference to FIGS. 1 to 9 and like parts have been given the same reference sign. In the induction coil assemblies 14, 32 described above, just one side of the strip 22, 34 of electrically conductive material is bonded or fixed to the electrically insulating layer 24. The other side of the strip 22, 34 remains unbonded or unfixed but is positioned adjacent the electrically insulating layer of the radially adjacent turn when the induction coil assembly 14, 32 is wound into the spiral construction. In the induction coil assembly 36 shown in FIGS. 10 and 11, a strip 22 of electrically conductive material is bonded or fixed to a first electrically insulating layer 24 and to a second electrically insulating layer 38 so that the strip 22 is sandwiched or embedded between them. In FIG. 10, part of the second electrically insulating layer 38 has been removed to show the strip 22 and the first electrically insulating layer 24.
[0096] In FIGS. 12 and 13 there is shown diagrammatically an induction coil assembly 40 according to a fourth embodiment of the disclosure. The induction coil assembly 40 is similar to the induction coil assemblies 14, 32 and 36 described with reference to FIGS. 1 to 11 and like parts have been given the same reference sign. Referring to FIG. 12, which shows the induction coil assembly 40 before it is wound, the induction coil assembly 40 comprises a strip 42 of electrically conductive material bonded or fixed to an electrically insulating layer 24. In this embodiment, the axial height of the strip 42 is narrower than the axial height of the strips 22, 34 described above and remains the same along the circumferential direction of the induction coil assembly 40. Referring to FIG. 12, the unwound strip 42 extends from one corner of the unwound electrically insulating layer 24, diagonally across the electrically insulating layer to the opposite corner. This means that after the induction coil assembly 40 is wound into the spiral construction, the strip 42 of electrically conductive material defines an induction coil with a helical construction. The axial position of the induction coil changes along the circumferential direction of the wound induction coil assembly 40 such that it winds around the heating chamber at a continuously increasing distance from the central axis of the induction coil assembly 40 and each turn is offset from the preceding turn in the axial direction. This axial offset between the adjacent turns of the strip 42 is most clearly shown in FIG. 13. It will also be noted from FIG. 13 that the turns of the strip 42 are not positioned in the same cylindrical plane, but rather that because of the overall spiral construction of the induction coil assembly 40, the first connector leg 26 is located at the radially innermost part of the wound strip 42 and the second connector leg 28 is located at the radially outermost part of the wound strip. The turns of the strip 42 are therefore actually positioned in a truncated conical plane and the induction coil defined by the strip specifically has a conical helical construction.
[0097] In FIGS. 14 and 15 there is shown diagrammatically an induction coil assembly 44 according to a fifth embodiment of the disclosure. The induction coil assembly 44 is similar to the induction coil assemblies 14, 32, 36 and 40 described with reference to FIGS. 1 to 13 and like parts have been given the same reference sign. Referring to FIG. 14, which shows the induction coil assembly 44 before it is wound, the induction coil assembly 44 comprises a plurality of strips 46a, 46b, . . . , 46g of electrically conductive material that are bonded or fixed to an electrically insulating layer 24. A total of seven strips are shown in FIGS. 14 and 15 but it will be understood that any suitable number may be provided. The strips 46a, 46b, . . . , 46g extend in parallel along the electrically conductive layer 24 between first and second connector legs 26, 28. Each strip 46 of electrically conductive material defines an induction coil that has a spiral construction. In particular, the axial position of each strip 46a, 46b, . . . , 46g does not change along the circumferential direction of the induction coil assembly 44 such that each strip winds around the heating chamber 6 at a continuously increasing distance from the central axis of the induction coil assembly 44. Each turn of each strip 46a, 46b, . . . , 46g overlaps fully with the preceding turn to form the spiral construction.
[0098] The strips 46a, 46b, . . . , 46g are spaced apart along the width of the unwound electrically insulating layer 24 (i.e., in the axial direction of the wound induction coil assembly 44) in an uneven manner. In particular, the spacing between each adjacent pair of strips 46a, 46b, . . . , 46g gradually changes along the width of the unwound electrically insulating layer 24. Referring to FIG. 15, the strips 46a, 46b that are located near the top 12 of the support 2 are closer together than the strips 46f, 46g that are located near the bottom 8 of the support. This means that the induction coils defined by the strips 46a, 46b, . . . , 46g are concentrated at the top of the induction coil assembly 44. The induction coils may also be concentrated at the middle or the base of the induction coil assembly in an alternative embodiment. The uneven distribution of induction coils in the axial direction of the induction coil assembly 44 may provide a desired electromagnetic field distribution within the heating chamber 6. In an alternative embodiment, the spacing between each adjacent pair of strips may be substantially the same so that there is a substantially even distribution of induction coils in the axial direction of the induction coil assembly 44.
[0099] In FIGS. 16 and 17 there is shown diagrammatically an induction coil assembly 48 according to a sixth embodiment of the disclosure. The induction coil assembly 48 is similar to the induction coil assemblies 14, 32, 36, 40 and 44 described with reference to FIGS. 1 to 15 and like parts have been given the same reference sign. Referring to FIG. 16, which shows the induction coil assembly 48 before it is wound, the induction coil assembly 48 comprises a strip 50 of electrically conductive material bonded or fixed to an electrically insulating layer 24. In this embodiment, the strip 50 has an axial height that changes or varies along the circumferential direction of the wound induction coil assembly 48. Referring to FIG. 16, the unwound strip 50 has a generally triangular shape. This means that after the induction coil assembly 48 is wound into the spiral construction, the strip 50 of electrically conductive material defines an induction coil whose axial height varies along the circumferential direction of the induction coil assembly. Such an induction coil may provide a desired electromagnetic field distribution within the heating chamber 6. The strip 50 winds around the heating chamber 6 at a continuously increasing distance from the central axis of the induction coil assembly 48 and each turn overlaps with the preceding turn to form the spiral construction.
[0100] In FIG. 18 there is shown diagrammatically an induction coil assembly 52 according to a seventh embodiment of the disclosure. The induction coil assembly 52 is similar to the induction coil assembly 14 described with reference to FIG. 5 and like parts have been given the same reference sign. Referring to FIG. 18, which shows the induction coil assembly 52 before it is wound, a third connector leg 54 projects from a centre part 22c of the strip 22 of electrically conductive material. The third connector leg 54 is therefore positioned between the first connector leg 26 and the second connector leg 28 along the length of the strip 22. It will be readily understood that any of the other induction coil assemblies described above may also include a third connector leg in a similar manner.
[0101] FIG. 19 is a circuit diagram of part of an electronic circuit of the aerosol generating device. The electronic circuit is electrically connected to the induction coil assembly 52 shown in FIG. 18. The first and second connector legs 26, 28 are electrically connected to power semiconductor switches T1, T2 of the electronic circuit. The power semiconductor switches T1, T2 may be controlled to turn on and off at high frequency to alternately connect each of the first and second connector legs 26, 28 to ground so that current flows back and forth through the induction coil assembly 52 in both directions, and in particular through the strip 22 of electrically conductive material that defines the induction coil and which is represented in the circuit diagram of FIG. 19 by the inductor L1. Turning the power semiconductor switches T1, T2 on and off will therefore create an alternating electromagnetic field for heating one or more susceptors in the aerosol generating article by inducing eddy current and/or magnetic hysteresis losses in the susceptors. The power semiconductor switches T1, T2 may be MOSFETs, for example. A capacitor C1 is electrically connected to the first and second connector legs 26, 28 in parallel with the inductor L1. The inductor L1 and the capacitor C1 together define a parallel LC circuit. The third connector leg 54 of the induction coil assembly 52 acts as a so-called “centre tap” and is electrically connected to a power source by means of a low-pass filter which is represented by a choke coil L2. The choke coil L2 may limit the current in the inductor L1 to acceptable levels and may help to optimise its frequency characteristics.
[0102] Although exemplary embodiments have been described in the preceding paragraphs, it should be understood that various modifications may be made to those embodiments without departing from the scope of the appended claims. Thus, the breadth and scope of the claims should not be limited to the above-described exemplary embodiments.
[0103] Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like, are to be construed in an inclusive as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.
