JP4432775B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture.

  Conventionally, in order to light a light source not only in a normal time but also in an emergency such as a power failure, a lighting fixture provided with an emergency lighting device has been provided in addition to a regular lighting device.

  In such lighting fixtures, taking into account waterproofness and the like, the lighting circuit blocks of the regular lighting device and the emergency lighting device are stored in a waterproof case. As such a waterproof case, for example, a case as shown in FIG. 6A is provided, and this case is a rectangular tube-like case with both ends opened to accommodate the emergency lighting circuit block 100. A main body 101 and flat end plates 102 and 102 which are fitted into openings at both ends of the case main body 101 and close the openings are provided. A gap between the end plates 102 and 102 and the inner side surface of the case main body 101 is made of urethane resin or the like. The compound 103 is sealed and sealed.

  On the other hand, instead of using the end plate 102 and the compound 103 as shown in FIG. 6A in order to seal the both end openings of the cylindrical case body having both ends opened, the opening of the case body is used. There is provided one in which a packing having a shape matching the above is fitted into the opening of the case body (Patent Document 1).

In addition, as shown in FIG. 6B, the packing is used as shown in FIG. 6 (b), and is attached to the opening of the case body 201 and the rectangular tube case body 201 having both ends opened to accommodate the emergency lighting circuit block 200. In the case main body 201 of the lighting circuit block 200, the flat plate end plate 203 to be attached to the case main body 201 by the attaching screw 204 so as to press the packing 202 against the case main body 201. A case having a metal spring 205 that restricts the movement of the metal spring 205 is provided.
JP 2000-285728 A (FIG. 1)

  By the way, in the case of using the compound 103 as shown in FIG. 6 (a), the waterproof property could be ensured, but there was a problem that the lighting circuit block 100 moved in the case main body 101 and was rattling. . Further, since the sealing is performed with the compound 103, it is difficult to take out the lighting circuit block 100 once stored, and it takes time and labor to dry the compound and the like, resulting in poor assembly. there were.

  On the other hand, in the case of inserting the packing as in Patent Document 1, the assembly is good because the assembly can be performed simply by inserting the packing into the case body, but only the packing is inserted. The waterproofness was worse than that using the above-mentioned compound. In addition, as in the case shown in FIG. 6A, the problem that the lighting circuit block moves and shakes within the case body has not been solved.

  On the other hand, in the case shown in FIG. 6 (b), since the packing 202 and the end plate 203 are used together, the waterproof property can be improved as compared with that of the above-mentioned Patent Document 1, and in addition, the lighting is performed. Since the metal spring 205 for restricting the movement of the circuit block 200 is provided in the case main body 201, the lighting circuit block 200 can be prevented from rattling to some extent. However, the provision of the metal spring 205 increases the number of parts, which increases the number of assembly steps, resulting in a problem of high manufacturing costs and assembly time.

  As described above, the conventional lighting fixtures cannot solve the problems of shading of the lighting circuit block, waterproofness, and assembling at the same time.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a lighting apparatus that can prevent rattling and can ensure waterproofness and assemblability.

In order to solve the above-described problems, in the lighting fixture according to claim 1, a lighting circuit block for lighting a light source, a cylindrical case body having both ends opened to accommodate the lighting circuit block, and both end openings of the case body A case comprising a pair of flat packings to be respectively attached, and a pair of end plates attached to the case main body so as to press both packings against the case main body, the packing comprising a lighting circuit block; A restricting means for restricting movement within the case body is integrally provided , and the restricting means is formed in a plate shape and is one end inside the case body opening.
A base part inserted into a gap formed between the surface and the lighting circuit block, and a pointed tip on the base part
And a support portion that protrudes into a shape and abuts against the lighting circuit block.
An inclined surface that is inclined toward the one end surface toward the inside of the opening of the case body is formed .

  According to the invention of claim 1, since the packing is pressed against the case main body by the end plate, the waterproofness can be secured, and the assembly can be performed simply by attaching the packing and the end plate to the case main body. Can be secured. In addition, since the movement of the lighting circuit block within the case body is restricted by the restriction means provided integrally with the packing, it is possible to prevent the lighting circuit block from rattling.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the packing includes a protrusion that abuts against the outer surface of the case body.

  According to the invention of claim 2, even when the inside of the case body is depressurized and the peripheral edge of the packing is likely to be drawn into the case body, the packing is provided with a protrusion that contacts the outer surface of the case body. Thus, it is possible to prevent the packing from being pulled into the case main body to form a gap between the packing and the case main body, thereby reducing the waterproof property.

  According to the present invention, since the packing is pressed against the case main body by the end plate, it is possible to secure waterproofness and to assemble by simply attaching the packing and the end plate to the case main body, so that the assembling property can also be ensured. In addition, since the movement of the lighting circuit block in the case body is regulated by the regulation means provided integrally with the packing, this can prevent the lighting circuit block from rattling. is there.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 5, the lighting fixture of the present embodiment is provided with nuts N and N and washers W and W corresponding to the bolts B and B, respectively, on a pair of bolts B and B suspended from the ceiling surface C. A long flat plate-like instrument body 6 to be used, a socket 60 provided on each lower surface of both longitudinal ends of the instrument body 6 and connected to the discharge lamp La electrically and mechanically, and the instrument body 6 And the common lighting device 7, the emergency lighting device 1, the terminal block 8, and the internal power source BT, and the common lighting device 7, the emergency lighting device 1, the terminal block 8, and the internal power source BT. And a cover 9 attached to the instrument body 6 by projecting each socket 60 downward.

  The instrument main body 6 is formed in a long flat plate shape as described above, and the bolts B and B are respectively inserted into the instrument main body 6 at positions that divide the instrument main body 6 into approximately three equal parts in the longitudinal direction. Holes 6 a and 6 a are formed, and a power line insertion hole 6 b for leading a power line V 1 of an external power source (not shown) provided on the ceiling surface C to the lower surface side of the instrument body 6 is formed. . Further, a pair of sockets 60, 60 are provided at both ends in the longitudinal direction on the lower surface side of the instrument body 6, and in the vicinity of each socket 60, a mounting screw S2 for mounting the cover 9 is screwed. A hole 6c is formed.

  The appliance body 6 includes two types of lighting devices, a regular lighting device 7 and an emergency lighting device 1, a terminal block 8 to which a power line V1 of an external power source is connected, and an internal power source BT that is an operating power source in an emergency. And are provided.

  The regular lighting device 7 is configured by housing a regular lighting circuit block (not shown) for lighting a discharge lamp La serving as a light source in a housing 70. This regular lighting circuit block includes, for example, a lighting circuit that turns on a discharge lamp La by converting an external power source such as a commercial power source that is an AC power source into a high-frequency AC power source. Is electrically connected.

  As shown in FIG. 1, the emergency lighting device 1 includes an emergency lighting circuit block (hereinafter simply referred to as a lighting circuit block) 5 for lighting a discharge lamp La in case of an emergency such as a power failure, as a case 10 (see FIG. 1). The lighting circuit block 5 is electrically connected to each socket 60 and the terminal block 8.

  The lighting circuit block 5 is an emergency lighting circuit that converts the internal power source BT to a high frequency power source to light the discharge lamp La, a detection circuit that detects whether or not an emergency such as a power failure, and a detection circuit. A control circuit for operating the emergency lighting circuit when it is detected is provided, and a printed circuit board 50 on which these circuits are mounted and a substrate case 53 for housing the printed circuit board 50 are provided. As shown in FIG. 1, the substrate case 53 includes a lower case 51 and an upper case 52. The lower case 51 is made of, for example, one surface (upper surface) and both side surfaces in the longitudinal direction using synthetic resin or metal. A support piece 51b (see FIG. 5) for storing the printed circuit board 50 at a predetermined distance from the bottom surface 51a of the lower case 51 on both ends in the longitudinal direction of the bottom surface 51a of the lower case 51. 2 (a)) is provided. Further, the bottom surface 51 a of the lower case 51 is covered with a film made of an insulating material or the like in order to maintain insulation between the lower case 51 and the printed circuit board 50. The upper case 52 is made of synthetic resin or metal, is formed in a box shape with an open bottom surface, and is attached to the lower case 51 so as to cover the open top surface of the lower case 51. is there. In FIG. 1, the lighting circuit block 5 is shown in a simplified manner.

  The case 10 includes a rectangular tube-shaped case main body 2 in which both ends of the lighting circuit block 5 are accommodated, a pair of flat packings 3 and 3 which are respectively attached to both end openings of the case main body 2, and both packings. 3 and 3 are provided with a pair of end plates 4 and 4 attached to the case main body 2 so as to press the case 3 against the case main body 2, respectively.

  As shown in FIG. 1, the case main body 2 is formed in a rectangular tube shape having both ends in the longitudinal direction opened by, for example, extruding aluminum, and has a long plate-like top plate portion 20 a and a top plate portion. A pair of long plate-like side plate portions 20b, 20b that are provided downward from both ends in the short direction of 20a and are connected to each other, and a long plate-like bottom plate portion that connects the lower ends of both side plate portions 20b, 20b. 20c is integrally provided. Screw holes 21 into which mounting screws S1 are respectively inserted from the longitudinal direction are formed at the four corners of the opening edge on both ends of the case body 2. Further, on the lower end side of the inner side surfaces of the both side plates 20b, 20b of the case body 2, the mounting plates 22, 22 for mounting the lighting circuit block 5 are close to each other and have a predetermined gap between the leading edges. Thus, the lighting circuit block 5 is placed on the mounting plates 22 and 22 so that the lighting circuit block 5 is separated from the bottom plate portion 20c and stored in the case body 2. Further, as shown in FIG. 2B, a pair of protrusions 23, 23 extending in the longitudinal direction of the top plate 20a are provided on the bottom surface of the top plate 20a.

  The packing 3 is made of, for example, silicon rubber, and includes a flat shield part 30 that covers the opening of the case body 2. The shield part 30 is formed with screw insertion holes 30 a for mounting screws S 1 at four corners. In addition, a plurality of connection line insertion holes 30b (four in the present embodiment) for inserting connection lines 54 (see FIG. 3A) such as lead wires and power supply lines of the lighting circuit block 5 are formed. ing. Further, the upper and lower end portions of the shielding portion 30 are prevented from being drawn into a rectangular parallelepiped that contacts the outer surface (upper surface) of the top plate portion 20a of the case body 2 and the outer surfaces of the side plate portions 20b and 20b, respectively. The protrusions 31, 32, and 32 are integrally protruded, and a restriction protrusion 33 that is a restriction means for restricting movement of the lighting circuit block 5 in the case body 2 is integrally protruded at the lower end part. Yes. The restriction projection 33 is a rectangular parallelepiped base portion 33a whose lower surface is in contact with the upper surface of the bottom plate portion 20c of the case body 2, and the upper surface of the base portion 33a is integrally protruded and separated in the lateral direction of the case main body 2. A pair of support portions 33b and 33b are provided, and each support portion 33b is formed in a shape that becomes a tip as it goes upward. Moreover, the inclined surface 33c which inclines below is formed in the front-end | tip part of each support part 33b.

  The end plate 4 has a flat plate portion 40 having substantially the same shape as the shielding portion 30 of the packing 3, and, like the shielding portion 30 of the packing 3, the flat plate portion 40 has screw insertion holes 40a for the mounting screws S1 at the four corners. Are formed, and a connection line insertion hole 40b for inserting the connection line of the lighting circuit block 5 is formed. In addition, a pressing plate 41 that abuts against the upper end surface of the shielding portion 30 of the packing 3 is integrally projected from the upper end edge of the back surface (the surface facing the packing 30) of the flat plate portion 40. A mounting plate 42 having a screw insertion hole 42a for a mounting screw (not shown) for mounting the case 10 to the instrument body 6 or the like is integrally projected from the lower end edge of the surface.

  The case main body 2, the packings 3 and 3, and the end plates 4 and 4 constitute a case 10. The case 10 is attached to the case main body 2 with the packings 3 and 3 and the end plates 4 and 4. In this case, the distance between the packings 3 and 3 is set to be slightly smaller than the length in the longitudinal direction of the lighting circuit block 5 (the length in the longitudinal direction of the lower case 51). The distance between the upper end of the support portion 33b of the packing 3 and the lower ends of the protrusions 23, 23 of the top plate portion 20a is slightly smaller than the height dimension of the lighting circuit block 5 (height dimension of the substrate case 53). It is set to be smaller.

  And the lighting circuit block 5 is accommodated in the case 10 as follows, and the emergency lighting device 1 is comprised. The lighting circuit block 5 is inserted into the case body 2 from one opening. At this time, as shown in FIG. 2A, a pair of both ends of the lower case 51 in the short direction is provided in the case body 2. Are placed on the mounting plates 22 and 22. After that, the packing 3 is attached to both ends of the case body 2 that are open so that the surfaces on which the protrusions 31, 32, 32 and the restricting protrusion 33 protrude are directed toward the case body 2. At this time, since the inclined surface 33c is formed at the tip of the support portion 33b of the restricting protrusion 33, the end of the lighting circuit block 5 moves upward along the inclined surface 33c (that is, the inclined surface 33c is Therefore, the regulation protrusion 33 of the packing 3 can be easily fitted between the lower surface of the lighting circuit block 5 and the bottom plate portion 20c of the case body 2, and thus the packing. 3 can be easily attached to the case body 2.

  Next, the end plates 4, 4 are attached to the case body 2 to which the packings 3, 3 are attached, the screw insertion holes 30 a of the packing 3, the screw insertion holes 40 a of the end plate 4, and the connection line insertion holes 30 b of the packing 3. And the connecting wire insertion holes 40b of the end plate 4 are arranged to communicate with each other, and the mounting screws S1 are respectively connected to the screw holes 21 of the case body 2 through the both screw insertion holes 30a and 40a communicated in this way. By screwing in, as shown in FIGS. 3A and 3B, the packing 3 and the end plate 4 are attached to the case main body 2. At this time, the packing 3 is pressed against the case main body 2 by the end plate 4. And is in close contact with the case body 2.

  In this way, the lighting circuit block 5 is housed in the case 10, and the connection line 54 of the lighting circuit block 5 is led out from the case 10 to the outside of the case 10 through both connection line insertion holes 30b and 40b. Become. At this time, a gap is generated between the connection line 54 and both the connection line insertion holes 30b, 40b, and the waterproof property may be broken by the gap. Therefore, as shown in FIG. Cylindrical silicon rubber 55 is fitted, and this silicon rubber 55 is positioned in both connection line insertion holes 30b and 40b, thereby closing the gap and maintaining waterproofness.

  On the other hand, in the packing 3 attached to the case main body 2, the protrusion 31 abuts on the top surface of the top plate portion 20a of the case main body 2 as shown in FIG. 4A, and as shown in FIG. The protrusion 32 is in contact with the outer surface of the side plate portion 20 b of the case body 2. Further, as shown in FIG. 4C, the restriction projection 33 of the packing 3 is between the lighting circuit block 5 and the case body 2, that is, the lower surface of the lighting circuit block 5 (the lower surface of the lower case 51) and the bottom plate portion. It is inserted between the upper surface of 20c. When the restricting projection 33 is thus fitted between the lighting circuit block 5 and the case body 2, the lighting circuit block 5 is lifted upward in the case body 2 by the support portions 33 b and 33 b of the restricting projection 33. . At this time, as described above, the distance between the upper end of the support portion 33b of the packing 3 and the lower end of the protrusion 23 of the top plate portion 20a is the height dimension of the lighting circuit block 5 (height dimension of the substrate case 53). 2 (b), the lighting circuit block 5 has an upper surface (the upper surface of the upper case 52) as a top plate portion by the elastic restricting projection 33 as shown in FIG. It is pressed against the protrusions 23 and 23 of 20a. In this way, the lighting circuit block 5 is held in close contact with the case body 2 by the protrusions 23 and 23 of the top plate portion 20a and the support portions 33b and 33b of the restricting means 33, whereby the lighting circuit block 5 The movement in the vertical direction is restricted.

  Further, as described above, the distance between the packings 3 and 3 is set to be slightly smaller than the longitudinal dimension of the lighting circuit block 5 (the longitudinal dimension of the lower case 5). Therefore, as shown in FIGS. 3A and 3B, the longitudinal ends of the lighting circuit block 5 (the longitudinal ends of the lower case 51) are pressed against the packings 3 and 3, respectively. Thus, the movement of the lighting circuit block 5 in the longitudinal direction and the lateral direction in the case body 2 is restricted.

  The terminal block 8 includes a pair of input side terminal portions (not shown) to which the power supply line V1 of the external power supply and the power supply line V2 of the internal power supply BT are separately connected, the regular lighting device 7 and the emergency lighting device 1. Energization between a pair of output side terminal portions (not shown) to which each power supply line (not shown) is connected separately and a pair of output side terminal portions respectively corresponding to the pair of input side terminal portions. And a switch 80 that is simultaneously turned on and off. The switch 80 is switched on and off by a pulling operation of the pull string 80a led downward from the terminal block 8, and is operated at the lower end portion of the pull string 80a to make it easy to operate the pull string 80a by hand. A gripping portion 80b is attached.

  The cover 9 is formed in a long box shape with an open upper surface, and the lower wall portion 90 has a pointed shape in which a central portion in the short direction projects downward, that is, a cross-sectional shape in a direction perpendicular to the longitudinal direction. Is substantially V-shaped. Further, the lower wall 90 has a socket hole 90a for projecting each socket 60 of the instrument body 6 downward at both ends in the longitudinal direction thereof, and a screw communicating with each screw hole 6c of the instrument body 6 respectively. An insertion hole 90b is formed, and a switch operation hole 90c for leading the gripping portion 80b and the pull string 80a of the terminal block 8 downward is formed. Further, a reflection plate 91 that reflects the light of the discharge lamp La is formed on the outer surface of the lower wall portion 90.

  The lighting fixture of this embodiment is comprised by the above, and each member is attached as follows. On the lower surface side of the appliance main body 6, a regular lighting device 7, an emergency lighting device 1, a terminal block 8 and an internal power source BT are attached, and each lighting device 7, 1 is connected to the terminal block 8 and each socket. The power supply line V1 of the external power supply and the power supply line V2 of the internal power supply BT inserted through the power supply line insertion hole 6b are connected to the terminal block 8, respectively. At this time, wiring is performed so that the service lighting device 7 and the external power supply are electrically connected via the terminal block 8, and the emergency lighting device 1 and the internal power supply BT are electrically connected via the terminal block 8. Wiring is made so as to be connected, and the switch 80 of the terminal block 8 can be turned on / off simultaneously between the regular lighting device 7 and the external power supply, and between the emergency lighting device 1 and the internal power supply BT. The instrument body 6 is attached to the ceiling surface C by screwing washers W and W and nuts N and N into bolts B and B inserted through the bolt insertion holes 6a and 6a of the instrument body 6, respectively. In this manner, the fixture body 6 attached to the ceiling surface C projects the sockets 60 from the socket insertion holes 90a of the cover 9, respectively, and the holding portions 80b of the terminal block 8 from the switch operation holes 90c. The cover 9 is attached by drawing out the pull string 80 a and screwing the attachment screws S <b> 2 through the screw insertion holes 90 b of the cover 9 into the screw holes 6 c of the instrument body 6.

  Thus, the lighting fixture is configured, and the operation of the lighting fixture will be described next. In the lighting fixture, the switch 80 is turned on / off by holding the grip portion 80b and pulling the pull string 80a downward, thereby switching on / off the discharge lamp La. The switch 80 is turned on. At this time, the discharge lamp La is lit by the regular lighting device 7 in a normal time when power is supplied from the external power source. On the other hand, when a power failure or the like occurs and an emergency occurs when power supply from an external power source cannot be obtained, this is detected by the detection circuit of the emergency lighting device 1, and the emergency lighting device is used using the internal power source BT. 1 turns on the discharge lamp La.

  As described above, according to the lighting apparatus of the present embodiment, since the packing 3 is attached to the opening at both ends of the case main body 2 and the packing 3 is pressed against the case main body 2 by the end plate 4, the waterproof property is provided. Can be secured. Further, since the assembly can be performed simply by attaching the packing 3 and the end plate 4 to the case body 2, the assemblability is better than the conventional one using the compound as shown in FIG. Since the restricting projection 33 serving as the restricting means is integrally formed, a separate member such as a metal spring is not required as shown in FIG. 6B, thereby ensuring assemblability. Moreover, since the movement of the lighting circuit block 5 within the case body 2 is restricted by the restriction projection 33 provided integrally with the packing 3 as described above, this prevents the lighting circuit block 5 from rattling. be able to. In addition, the conventional example shown in FIG. 6B has a problem that the arrangement position of the metal spring 205 varies and the lighting circuit block 200 is inclined. However, the regulation protrusion 33 is provided integrally with the packing 3. Such a problem can be solved. Further, by preventing the lighting circuit block 5 from rattling, the lighting circuit block 5 and the case 10 are brought into close contact with each other between the manufactured lighting fixtures. It is possible to obtain a lighting device with stable performance by suppressing variations in performance such as heat dissipation due to the light.

  By the way, since such a waterproof case has airtightness, when the discharge lamp is turned off, the inside of the case is depressurized and is at a lower pressure than the outside of the case. For this reason, the conventional problem shown in FIG. 6B has the following problems. That is, in the case of the conventional example shown in FIG. 6B, as shown in FIG. 7A, the flat packing 202 is sandwiched between the case main body 201 and the end plate 203 and attached. When the inside of the case is depressurized when the discharge lamp is turned off, the peripheral edge of the packing 202 is drawn into the case main body 201 as shown in FIG. 7B, and the waterproofness and airtightness of the case are reduced. There was a problem that it could not be held.

  On the other hand, in the case 10 of the lighting fixture of this embodiment, as shown to Fig.4 (a), (b), the upper surface of the top-plate part 20a of the case main body 2 and side-plate part 20b, 20b are shown in packing 3. Since the protrusions 31, 32, and 32 that are in contact with the outer surfaces are provided, even if the inside of the case 10 is depressurized when the discharge lamp La is extinguished, the protrusions 31, 32, and 32 are connected to the top plate portion 20 a and the side plate portions. 20b and 20b are in contact with each other, so that the packing 3 is prevented from being pulled into the case main body 2 due to the reduced pressure, thereby forming a gap between the packing 3 and the case main body 2 and reducing the waterproof property or the like. Can be prevented. In addition, since the presser plate 41 that abuts the upper end surface of the shielding portion 30 of the packing 3 is provided at the upper end edge of the end plate 4, the upper edge of the shielding portion 30 when the packing 3 is likely to be pulled in due to decompression. It can suppress that a part bends and can maintain the contact state of the protrusion 31 and the top-plate part 20a. Further, by providing such protrusions 31, 32, 32, even if the packing 3 is pulled in, if the protrusions 31, 32, 32 are visually observed from the appearance of the case 10, the packing 3 It can be confirmed immediately whether or not it is withdrawn.

It is a disassembled perspective view of the emergency lighting device of the lighting fixture of this invention. (A) is a side view which shows the state which accommodated the lighting circuit block in the case, (b) is a side view which shows the state which attached the packing and the end plate to the figure (a). (A) is the partial side view which cut off the case of the emergency lighting device, and (b) is the partial top view which cut off the case of the emergency lighting device. 3A is an enlarged view of a portion indicated by P1 in FIG. 3A, FIG. 3B is an enlarged view of a portion indicated by P2 in FIG. 3B, and FIG. It is an enlarged view of the part shown by P3 in 3 (a). It is a disassembled perspective view of the lighting fixture of this invention. (A) is the side view which partially cut away the case of the conventional emergency lighting device, (b) is an exploded perspective view of the principal part of the case of the other conventional emergency lighting device. (A) is explanatory drawing which shows the state in which packing is normally attached in the case same as the above, (b) is explanatory drawing which shows the state by which packing was drawn in in the case main body.

Explanation of symbols

2 Case body 3 Packing 4 End plate 5 Lighting circuit block 33 Restriction protrusion

Claims (2)

A lighting circuit block for lighting a light source, a cylindrical case main body having both ends opened to accommodate the lighting circuit block, a pair of flat packings respectively attached to both end openings of the case main body, and both packings as pressed against the case body comprises a casing consisting of a pair of end plates attached to the case body, the packing is integrally provided with a regulating means for regulating the movement in the case body of the lighting circuit block, regulation The means is formed in a plate shape
Inserted into a gap formed between the one end face in the case body opening and the lighting circuit block.
And a support portion that projects from the base portion in a pointed shape and contacts the lighting circuit block.
The tip of the support part is inclined toward the one end face toward the opening of the case body.
A luminaire having a slope . The lighting apparatus according to claim 1, wherein the packing includes a protrusion that contacts the outer surface of the case body.

Images