Retrofit LED lamp for vehicle light

Abstract

An LED lamp (1) for vehicle lamps, comprising a modified body (112) defining a longitudinal direction and integrally configured as a heat sink, an electrically conductive structure (13) arranged in a cavity of the modified body (12), and at least one LED module (11) electrically connected to the electrically conductive structure (13), the at least one LED module (11) comprising a substrate (111) and diode semiconductors (112) applied to the substrate (111); a modified body (12), an electrically conductive structure (13), and a method of manufacturing an LED lamp (1) for vehicles.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Patent Application No. 63 / 042716, filed June 23, 2020, and European Patent Application No. 20189392.2, filed August 4, 2020, each of which is incorporated herein by reference in its entirety. Technical Field

[0003] This invention relates to an LED lamp for automotive lighting, the LED lamp comprising a modified body defining a longitudinal direction and integrally configured as a heat sink, a conductive structure disposed in a cavity of the modified body, and at least one LED module electrically connected to the conductive structure, the at least one LED module comprising a substrate and a diode semiconductor applied to the substrate. The invention also relates to a modified body for an LED lamp, a conductive structure for an LED lamp, and a method of manufacturing an LED lamp for automotive lighting. Background Technology

[0004] Lamps used for vehicle lighting can be used in many different configurations and are used to provide a light source for vehicle lighting (such as headlights). A conventional lamp includes a lamp base that matches the lamp holder of the corresponding vehicle lamp, a bulb supported by the lamp base and filled with gas (such as halogen gas), and a filament arranged inside the bulb and electrically connected to electrical contacts that can be electrically connected from the outside.

[0005] The headlights and corresponding lamps are provided with matching lamp holders and lamp bases, and are standardized for economic and practical reasons. Exemplary lamp holders for headlight halogen lamps are standardized for H4, H7, and H9 lamps (to name a few). Headlight halogen lamps that match one of these exemplary lamp holders are configured to consume 55 W, 60 W, or 65 W of electrical power.

[0006] Recently, LED lights have been made available to replace traditional lights. LED lights used to replace traditional lights can also be called LED modified bulbs, although they usually do not include a bulb.

[0007] These LED lights are configured to consume less power than conventional lights, for example, in the range of 10 W to 20 W. LED lights typically comprise one or more (especially two) LED modules. Each LED module of an LED light may have a layered structure comprising a plate-like substrate, one or more diode semiconductors applied to the substrate for emitting light, and a light-emitting layer applied to each diode semiconductor for converting, for example, blue light emitted by the diode semiconductor into white light emitted by the LED module.

[0008] The LED lamp further comprises a conventional lamp base for mating with a corresponding lamp socket of the vehicle lamp and the retrofit body. The retrofit body is configured for supporting one or more LED modules and arranging them substantially at a filament position of a conventional lamp relative to the lamp base.

[0009] Although the consumed electric power is low, the diode semiconductor generates a large amount of heat during normal operation, which has to be removed from the diode semiconductor, i.e. the diode semiconductor has to be properly cooled. Since the LED lamp of the kind initially mentioned has to optically imitate a conventional lamp as closely as possible, the at least one diode semiconductor has to be concentrated in a very small spatial volume. However, the smaller the spatial volume, the more difficult it is to remove the generated heat from the at least one diode semiconductor.

[0010] Since the higher operating temperature of the at least one diode semiconductor increases the risk of defects of the at least one diode semiconductor, the service life of the LED lamp tends to be the shorter, the better the LED lamp imitates a conventional lamp. SUMMARY

[0011] It is an object of the present invention to provide an LED lamp for a vehicle lamp, which imitates a conventional lamp optically as closely as possible, while having a service life as long as possible. It is a further object of the present invention to provide a retrofit body for an LED lamp and an electrically conductive structure for an LED lamp and to suggest a method of manufacturing an LED lamp for a vehicle lamp.

[0012] The invention is defined by the independent claims. The dependent claims specify advantageous embodiments, respectively.

[0013] A first aspect of the present invention is an LED lamp for a vehicle lamp, the LED lamp comprising a retrofit body defining a longitudinal direction and being integrally configured as a heat sink, an electrically conductive structure being arranged in a cavity of the retrofit body, and at least one LED module being electrically connected to the electrically conductive structure, the at least one LED module comprising a substrate and a diode semiconductor applied to the substrate. The electrically conductive structure can comprise a printed circuit board (PCB) or a lead frame. The LED lamp is configured to replace a conventional lamp for a vehicle lamp, i.e. to be installed in a conventional socket of a vehicle lamp, thereby arranging the diode semiconductor substantially at a filament position of a conventional lamp installed in the vehicle lamp.

[0014] According to the invention, the substrate is attached to the retrofit body with at most one bonding material arranged between the substrate and the retrofit body. The bonding material can comprise a thermally conductive adhesive or a solder paste. The diode semiconductor and the heat sink, i.e. the retrofit body, are separated only by the substrate and at most the bonding material. The spatial distance between the diode semiconductor and the supporting retrofit body is as small as possible. Due to the small spatial distance, the diode semiconductor can be arranged within a small focusing volume predetermined by the filament size of a conventional lamp. As a result, the LED lamp imitates the conventional lamp very well.

[0015] At the same time, the diode semiconductor and the entire retrofit body acting as an effective heat sink are as little mechanically separated from each other as possible, i.e. as tightly thermally connected as possible. Due to the tight thermal connection, the heat transfer from the diode semiconductor to the retrofit body is improved. Due to the improved heat transfer, the operating temperature of the diode semiconductor is reduced, resulting in a longer service life of the diode semiconductor and thus of the LED lamp.

[0016] The retrofit body preferably comprises a support portion laterally adjacent to the lateral opening of the retrofit body, which supports at least one LED module. The support portion can be configured as a rectangular plate with a thickness in the range of 0.5 mm to 1.5 mm and preferably 1 mm.

[0017] Advantageously, the finger portion of the electrically conductive structure is arranged laterally adjacent to the support portion. The electrical contacts of the finger portion are close to the LED module, thereby allowing a short electrical connection of the LED module and the electrically conductive structure.

[0018] In a preferred embodiment, the electrically conductive structure is configured to be inserted and fixed within a central hole of the retrofit body, the finger portion fits in a conduit of the retrofit body and comprises two electrical contacts for contacting the at least one LED module with the electrical contacts, which are accessible through the lateral opening in the inserted state of the electrically conductive structure. The lateral opening facilitates the connection of the electrical contacts of the electrically conductive structure to the contact elements of the LED module.

[0019] Advantageously, the central hole extends longitudinally from an end face of the retrofit body and the conduit extends longitudinally from a bottom portion of the central hole to the lateral opening. The central hole can accommodate a driver circuit for driving the LED module. The central hole preferably has a cylindrical shape or a rectangular cross-section. The conduit can also have a cylindrical shape or a rectangular cross-section and allows the electrically conductive structure to extend longitudinally to the lateral opening. The conduit does not need to be completely closed but can have a lateral opening.

[0020] The conduit can be arranged eccentrically with respect to the central hole. The eccentric arrangement allows the electrically conductive structure to be arranged laterally within the retrofit body.

[0021] In many embodiments, the edge region of the retrofit body around the lateral opening widens in the light emission direction of the at least one LED module. The edge region can have a bevel or one or more steps for enlarging the maximum light emission angle of the at least one LED module.

[0022] In other embodiments, the LED lamp can comprise two LED modules attached to opposite sides of the support portion. The two LED modules emit light in two opposite directions, thereby better imitating the filament of a conventional lamp emitting light to a full spatial angle. The substrate of the LED modules typically has a thickness in the range from 0.5 to 1-5 mm, and preferably 1 mm. Thus, the opposite diode semiconductors are only spaced apart by about 3 mm, which substantially corresponds to the diameter of the filament coil of a conventional lamp. The LED lamp can also comprise an even number of LED modules, half of which are attached to each side of the support portion, respectively.

[0023] Preferably, the electrically conductive structure is arranged spaced apart from the substrate of the LED module. Due to the spatial separation of the LED module and the electrically conductive structure, the heat transfer from the LED module to the electrically conductive structure is reduced. The reduced heat transfer allows for a long service life of the electrically conductive structure and thus of the LED lamp.

[0024] In many embodiments, the LED lamp comprises a pair of electrically conductive elements electrically connecting the at least one LED module to the electrical contacts of the electrically conductive structure. Each electrically conductive element can comprise a metal strip or a metal wire.

[0025] A second aspect of the present invention is a retrofit body for an LED lamp to be installed to a vehicle lamp, the retrofit body being integrally configured as a heat sink for at least one LED module and configured for supporting the at least one LED module, the retrofit body comprising a central bore extending longitudinally from an end face of the retrofit body, a lateral opening, and a duct extending longitudinally from a bottom portion of the central bore to the lateral opening, wherein the central bore, the duct and the lateral opening are configured to accommodate an electrically conductive structure configured to be inserted and fixed within the central bore and comprising a finger portion fitted in the duct of the retrofit body, the finger portion comprising two electrical contacts for contacting the at least one LED module with the electrical contacts, the electrical contacts being accessible through the lateral opening in the inserted state of the electrically conductive structure. The retrofit body can be provided as a semi-finished product, which can be manufactured by molding and / or machining.

[0026] A third aspect of the invention is an electrically conductive structure for an LED lamp to be mounted to a vehicle light, the electrically conductive structure being configured to be inserted and fixed within a retrofit body of the LED lamp, the retrofit body being integrally configured as a heat sink and comprising a central bore extending longitudinally from an end face of the retrofit body, a lateral opening, and a duct extending longitudinally from a bottom portion of the central bore to the lateral opening, wherein the electrically conductive structure comprises a finger portion that fits in the duct of the retrofit body, the finger portion comprising two electrical contacts for at least one LED module, the electrical contacts being accessible through the lateral opening of the retrofit body in an inserted state of the electrically conductive structure. The electrically conductive structure can be provided as a semi-finished product, which can be manufactured in a usual manner.

[0027] A fourth aspect of the invention is a method of manufacturing an LED lamp for a vehicle. The method comprises the following steps:

[0028] - providing at least one LED module as a first semi-finished product, the LED module comprising a substrate, a diode semiconductor applied to the substrate, and a luminescent layer applied to the diode semiconductor;

[0029] - providing a retrofit body as a second semi-finished product, the retrofit body being integrally configured as a heat sink for the at least one LED module, the retrofit body comprising a central bore extending longitudinally from an end face of the retrofit body, a lateral opening, and a duct extending longitudinally from a bottom portion of the central bore to the lateral opening;

[0030] - attaching the substrate of the at least one LED module to the retrofit body adjacent to the lateral opening, wherein at most a bonding material is arranged between the substrate and the retrofit body;

[0031] - providing an electrically conductive structure as a third semi-finished product, the electrically conductive structure being configured to be inserted and fixed within the central bore of the retrofit body, the electrically conductive structure comprising a finger portion that fits in the duct of the retrofit body, the finger portion comprising two electrical contacts for contacting the at least one LED module with the electrical contacts, the electrical contacts being accessible through the lateral opening in an inserted state of the electrically conductive structure;

[0032] - inserting the electrically conductive structure into the central bore and the duct of the retrofit body; and

[0033] - electrically connecting the at least one LED module with the electrical contacts of the electrically conductive structure via a pair of electrically conductive elements.

[0034] The method allows for very easily manufacturing the LED lamp by assembling three semi-finished products, wherein the first semi-finished product is thermally connected to the second semi-finished product and electrically connected to the third semi-finished product.

[0035] In many embodiments, electrically connecting the at least one LED module comprises ultrasonic welding the electrically conductive element to the at least one LED module and to the electrical contact of the electrically conductive structure. The ultrasonic welding can be easily performed since both the contact element of the LED module and the electrical contact of the electrically conductive structure are accessible via the lateral opening of the retrofit body.

[0036] In a preferred embodiment, two LED modules are attached to the support portion of the retrofit body on opposite sides of the support portion.

[0037] One basic advantage of the LED lamp according to the present application is that due to the tight clamping of the diode semiconductors and the retrofit body of the LED lamp, a conventional lamp is well imitated and due to the effective cooling, the service life of the LED lamp is long. Another advantage is the ease of manufacture due to the use of three semi-finished products during the final assembly.

[0038] It is to be understood that the preferred embodiments of the present application can be any combination of features of the dependent claims with the corresponding independent claim. Further advantageous embodiments are defined below. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A perspective view of an LED lamp according to an embodiment of the present application is schematically shown;

[0040] Figure 2 A perspective view of an LED module of the LED lamp shown is schematically shown; Figure 1 A side view of the LED module of the LED lamp shown;

[0041] Figure 3 A perspective view of a retrofit body of the LED lamp shown is schematically shown; and Figure 1 A cross-sectional view of the retrofit body of the LED lamp shown; and

[0042] Figure 4 A top view of an electrically conductive structure of the LED lamp shown is schematically shown. Figure 1

[0043] In the drawings, like numerals refer to like objects throughout the various figures. The objects shown in the various figures are not necessarily to scale. DETAILED DESCRIPTION

[0044] Figure 1 A perspective view of an LED lamp 1 according to an embodiment of the present application is schematically shown. The LED lamp 1 can be installed to a vehicle lamp, for example a headlight of a vehicle. The LED lamp 1 comprises a retrofit body 12 defining a longitudinal direction 127. The retrofit body 12 can comprise metal and be integrally configured as a heat sink which can have a plurality of fins 125 extending perpendicularly to the longitudinal direction 127 from one end of the retrofit body 12.

[0045] ​The LED lamp 1 can further comprise a flange 126 for mounting the LED lamp 1 to a corresponding socket of a vehicle lamp. The flange 126 can comprise or consist of plastic and can have an annular shape with the retrofit body 12 extending through the flange 126. In other embodiments, the flange 126 can be an integral portion of the retrofit body.

[0046] The LED lamp 1 further comprises two LED modules 11, one of which is hidden in the figure.

[0047] Figure 2 A cross-sectional view of the retrofit body 12 of the LED lamp 1 is shown schematically. Figure 1 The LED module 11 shown on the retrofit body 12 of the LED lamp 1. The LED module 11 comprises a plate-like substrate 111, a diode semiconductor 112 applied to the substrate 111 for emitting light, and a luminescent layer 113 applied to the diode semiconductor 112 for converting blue light emitted by the diode semiconductor 112, for example, into white light emitted by the LED module 11. Furthermore, the LED module 11 comprises a pair of electrical contact elements 114 electrically connected to the diode semiconductor 112. The substrate 111 is attached to the retrofit body 12, in particular to the support portion 121 of the retrofit body 12, with the bonding material 15 arranged between the substrate 111 and the retrofit body 12.

[0048] The bonding material 15 can be a thermally conductive adhesive or a solder paste. In different embodiments, the bonding material 15 can even be omitted. In these embodiments, the substrate 111 can be directly attached to the support portion 121. The direct attachment can be realized, for example, by ultrasonic welding or by riveting or screwing, to name just a few possibilities.

[0049] Figure 3 A cross-sectional view of the retrofit body 12 of the LED lamp 1 is shown schematically. Figure 1 The LED module 11 shown on the retrofit body 12 of the LED lamp 1. The LED module 11 comprises a plate-like substrate 111, a diode semiconductor 112 applied to the substrate 111 for emitting light, and a luminescent layer 113 applied to the diode semiconductor 112 for converting blue light emitted by the diode semiconductor 112, for example, into white light emitted by the LED module 11. Furthermore, the LED module 11 comprises a pair of electrical contact elements 114 electrically connected to the diode semiconductor 112. The substrate 111 is attached to the retrofit body 12, in particular to the support portion 121 of the retrofit body 12, with the bonding material 15 arranged between the substrate 111 and the retrofit body 12. Figure 1 In other embodiments, the edge region can have one or more steps or a combination of steps and bevels.

[0050] The retrofit body 12 comprises a support portion 121, which is preferably configured plate-like with a thickness in the range of 0.5 mm to 1.5 mm, and preferably 1 mm. The support portion 121 is arranged laterally adjacent to the lateral opening 122. The support portion 121 supports two LED modules 11 attached to opposite sides of the support portion 121.

[0051] The retrofit body 12 can be provided as a semi-finished product at the time of manufacturing the LED lamp 1. The retrofit body 12 is integrally configured as a heat sink for the at least one LED module 11 and configured for supporting the at least one LED module 11. The retrofit body 12 comprises a central hole 123 and a conduit 124. The conduit 124 and the lateral opening 122 are configured to accommodate the electrically conductive structure 13 of the LED lamp 1, which will be described in detail below.

[0052] The LED lamp 1 further comprises an electrically conductive structure 13 arranged in the cavity of the retrofit body 12.

[0053] Figure 4 A top view of the electrically conductive structure 13 of the LED lamp 1 is shown schematically. Figure 1 The electrically conductive structure 13 can comprise a printed circuit board (PCB) or a lead frame and is configured to be inserted and fixed within the central hole 123. The electrically conductive structure 13 can support a driver circuit 133 of the LED lamp 1 for driving the LED modules 11. The electrically conductive structure 13 comprises a finger portion 131 that fits in the conduit 124 of the retrofit body 12. In the inserted state of the electrically conductive structure 13, the finger portion 131 is arranged laterally adjacent to the support portion 121 of the retrofit body 12.

[0054] The finger portion 131 comprises two pairs of electrical contacts 132 for contacting the at least one LED module 11, which are arranged on opposite sides of the finger portion 131 at a free end of the finger portion 131. In the inserted state of the electrically conductive structure 13, the electrical contacts 132 are accessible through the lateral opening 122.

[0055] Each LED module 11 is electrically connected to the electrically conductive structure 13. The LED lamp 1 comprises two pairs of electrically conductive elements 14, which electrically connect the LED modules 11 to the electrical contacts 132 of the electrically conductive structure 13. Each electrically conductive element 14 is configured as a metal strip. In other embodiments, each electrically conductive element can be configured as a metal wire.

[0056] The electrically conductive structure 13 can be provided as a semi-finished product for manufacturing the LED lamp 1. The electrically conductive structure 13 is configured to be inserted and fixed within the retrofit body 12 of the LED lamp 1 and comprises a finger portion 131 that fits in the conduit 124 of the retrofit body 12, wherein the finger portion 131 comprises two electrical contacts 132 for the at least one LED module 11.

[0057] An LED lamp 1 for a vehicle is manufactured by performing the following steps.

[0058] An LED module 11 is provided as a first semi-finished product. A retrofit body 12 is provided as a second semi-finished product. The two LED modules 11, i.e. the substrates 111 of the two LED modules 11, are attached to the retrofit body 12 in the vicinity of the lateral opening 122 with the bonding material 15 arranged between the substrates 111 and the retrofit body 12.

[0059] A conductive structure 13 is provided as a third semi-finished product. The conductive structure 13 is inserted into the central hole 123 and the duct 124 of the retrofit body 12. The LED modules 11 are each electrically connected with the electrical contacts 132 of the conductive structure 13 via a pair of conductive elements 14. Electrically connecting the LED modules 11 can comprise ultrasonic welding the conductive elements 14 to the LED modules 11 and to the electrical contacts 132 of the conductive structure 13.

[0060] Variations to the disclosed embodiments can become apparent to those of skill in the art from the foregoing description, the disclosures, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0061] Any reference signs in the claims should not be construed as limiting the scope.

[0062] Reference Signs:

[0063] 1 LED lamp

[0064] 11 LED module

[0065] 111 substrate

[0066] 112 diode semiconductor

[0067] 113 light emitting layer

[0068] 114 contact element

[0069] 12 retrofit body

[0070] 121 support portion

[0071] 122 lateral opening

[0072] 123 hole

[0073] 124 duct

[0074] 125 fin

[0075] 126 flange

[0076] 127 longitudinal direction

[0077] 13 electrically conductive structure

[0078] 131 finger portion

[0079] 132 electrical contact

[0080] 133 driver circuit

[0081] 14 contact element

[0082] 15 bonding material

Claims

1. An LED lamp for a vehicle lamp, the LED lamp comprising: a retrofit body (12) defining a longitudinal direction (127) and configured to dissipate heat, the retrofit body comprising a cavity comprising a central bore (123) extending longitudinally from an end face of the retrofit body (12), and a duct (124) narrower than the central bore (123) and extending longitudinally from a bottom portion of the central bore (123) to a lateral opening (122); an electrically conductive structure (13) comprising a printed circuit board or a lead frame, the printed circuit board or lead frame comprising a driver circuit (133) arranged in the central bore (123) of the retrofit body (12), and a finger portion (131) narrower than the driver circuit (133) and extending from the driver circuit (133), the finger portion (131) being arranged in the duct (124) of the retrofit body (12) and extending to the lateral opening (122); at least one LED module (11) electrically connected to the electrically conductive structure (13) and configured to be driven by the driver circuit (133), the at least one LED module (11) comprising a substrate (111) and a diode semiconductor (112) provided on the substrate (111), the substrate (111) being attached to the retrofit body (12) with a joint material (15) between the substrate (111) and the retrofit body (12).

2. The LED lamp according to claim 1, wherein the retrofit body (12) comprises a support portion (121) laterally adjacent to the lateral opening (122) of the retrofit body (12), the support portion (121) supporting the at least one LED module (11).

3. The LED lamp according to claim 2, wherein the finger portion (131) of the electrically conductive structure (13) is arranged laterally adjacent to the support portion (121).

4. The LED lamp according to claim 2, wherein the finger portion (131) comprises two electrical contacts (132) for contacting the at least one LED module (11) with the electrical contacts (132), the electrical contacts (132) being accessible through the lateral opening (122).

5. The LED lamp according to claim 4, comprising a pair of electrically conductive elements (14) electrically connecting the at least one LED module (11) to the electrical contacts (132) of the electrically conductive structure (13).

6. The LED lamp according to claim 2, wherein a marginal area of the retrofit body (12) surrounding the lateral opening (122) widens in a light emission direction of the at least one LED module (11).

7. The LED lamp according to claim 2, comprising two LED modules (11) attached to opposite sides of the support portion (121).

8. The LED lamp according to claim 1, wherein the duct (124) is arranged eccentrically with respect to the central bore (123).

9. The LED lamp according to claim 1, wherein the electrically conductive structure (13) is arranged spaced apart from a substrate (111) of the LED module (11).

10. The LED lamp according to claim 1, further comprising a luminescent layer (113) disposed on the diode semiconductor (112).

11. The LED lamp according to claim 1, further comprising a plurality of fins (125) at least partially surrounding the central bore (123).

12. A method of manufacturing an LED lamp for a vehicle, the method comprising: providing at least one LED module (11) comprising a substrate (111) and a diode semiconductor (112) applied to the substrate (111); providing a retrofit body (12) configured as a heat sink for the at least one LED module (11), the retrofit body (12) comprising a central bore (123) extending longitudinally from an end face of the retrofit body (12), a lateral opening (122), and a duct (124) extending longitudinally from a bottom portion of the central bore (123) to the lateral opening (122); attaching the substrate (111) of the at least one LED module (11) to the retrofit body (12) adjacent the lateral opening (122), wherein at most a bonding material (15) is arranged between the substrate (111) and the retrofit body (12); providing an electrically conductive structure (13) configured to be inserted and fixed within the central bore (123) of the retrofit body (12), the electrically conductive structure (13) comprising a printed circuit board or a lead frame, the printed circuit board or the lead frame comprising a driver circuit (133) configured to drive the at least one LED module (11) and a finger portion (131) fitted in the duct (124) of the retrofit body (12), the driver circuit (133) being arranged in the central bore (123) of the retrofit body (12), the finger portion (131) being narrower than the driver circuit (133) and extending from the driver circuit (133), the finger portion (131) comprising two electrical contacts (132) for contacting the at least one LED module (11) with the electrical contacts (132), and in the inserted state of the electrically conductive structure (13), the electrical contacts (132) being accessible through the lateral opening (122); inserting the driver circuit (133) of the electrically conductive structure (13) into the central bore (123) and inserting the finger portion (131) of the electrically conductive structure (13) into the duct (124) of the retrofit body (12); electrically connecting the at least one LED module (11) with the electrical contacts (132) of the electrically conductive structure (13) via a pair of electrically conductive elements (14).

13. The method according to claim 12, wherein electrically connecting the at least one LED module (11) comprises ultrasonic welding the electrically conductive element (14) to the at least one LED module (11) and to the electric contact (132) of the electrically conductive structure (13).

14. The method according to claim 12 or 13, wherein the retrofit body (12) comprises a support portion (121) laterally adjacent to the lateral opening (122) of the retrofit body (12), both LED modules (11) being attached to the support portion (121) of the retrofit body (12) on opposite sides of the support portion (121).

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