Rotary electrical component

Abstract

A rotary electrical component that suppresses rattling of a spring member during a rotary operation is provided with: a lower housing; an upper cover attached to the upper side of the lower case so as to cover the opening of the lower case; the shell is composed of a lower shell and an upper cover, and an accommodating space is formed in the shell; a rotating member which is at least partially accommodated in the accommodating space and is supported so as to be rotatable with respect to the housing in the vertical direction as a rotation center; a cam part formed by a concave-convex part continuously formed on the rotating member along an arc-shaped imaginary line surrounding the rotation center; a spring member comprising a fixed portion sandwiched between the lower housing and the upper cover, an elastic deformation portion extending from the fixed portion, and an elastic contact portion formed on the elastic deformation portion and elastically contacting the cam portion; the rotation stopping mechanism is composed of a clamped part arranged on the fixing part of the spring component and a clamping part arranged on the shell and used for clamping the clamped part. And a crimping mechanism comprising a receiving plate portion extending downward from the outer peripheral portion of the upper cover, and a crimping plate portion extending from the fixing portion of the spring member toward the receiving plate portion and crimping the receiving plate portion.

Description

Technical Field

[0001] This invention relates to rotary electrical components. Background Technology

[0002] The following technology is disclosed in Patent Document 1: In a rotary encoder having an operating shaft capable of rotation, a pawl spring is inserted between the upper surface of the housing and the mounting fitting, and an anti-rotation mechanism is provided to prevent the pawl spring from rotating by a protrusion.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2009-170328

[0004] However, in the technology of Patent Document 1, the anti-rotation mechanism alone is insufficient to stop the rotation of the pawl spring, and the pawl spring has a wobbling in the direction of rotation. Therefore, when the operating shaft is rotated, the pawl spring rotates repeatedly in both directions, which may generate noise from the anti-rotation mechanism. Summary of the Invention

[0005] One embodiment of the rotary electrical component includes: a lower housing having a bottom, a peripheral wall extending upward from the periphery of the bottom, and an opening formed at the upper end of the peripheral wall; an upper cover mounted on the upper side of the lower housing to cover the opening; a housing consisting of the lower housing and the upper cover, forming a receiving space inside; a rotary member, at least a portion of which is received in the receiving space and supported to be rotatable relative to the housing in a vertical direction about a rotation center; a cam portion consisting of a protrusion and a recess continuously formed along an imaginary arcuate line surrounding the rotation center; and a spring. The component comprises a fixing part clamped between the lower housing and the upper cover, an elastic deformation part extending from the fixing part, and an elastic contact part formed in the elastic deformation part and elastically contacting the cam part; and an anti-rotation mechanism comprising a locking part provided in the fixing part of the spring component and a locking part provided in the housing and locking the locking part. The rotary electrical component includes a pressing mechanism comprising a receiving plate part extending downward from the outer periphery of the upper cover and a pressing plate part extending from the fixing part of the spring component toward the receiving plate part and pressing against the receiving plate part.

[0006] Invention Effects

[0007] According to one embodiment, a rotary electrical component can suppress the wobbling of the spring component during the rotational operation of the rotary component. Attached Figure Description

[0008] Figure 1 This is a perspective view of the external appearance of a rotary electrical component according to one embodiment.

[0009] Figure 2 This is an exploded perspective view of a rotary electrical component according to one embodiment.

[0010] Figure 3 This is a perspective sectional view of a rotating electrical component according to one embodiment.

[0011] Figure 4 This is a perspective sectional view showing the engaged state of the hook of a rotary electrical component according to one embodiment.

[0012] Figure 5 This is a top view of the lower housing of a rotary electrical component according to one embodiment.

[0013] Figure 6 This is a diagram illustrating the anti-rotation mechanism and crimping mechanism of a rotary electrical component according to one embodiment.

[0014] Figure 7 This is a diagram illustrating the anti-rotation mechanism and crimping mechanism of a rotary electrical component according to one embodiment.

[0015] Figure 8 This is a cross-sectional view of a rotary electrical component according to one embodiment.

[0016] Explanation of reference numerals in the attached figures

[0017] 100 Rotary Electrical Components

[0018] 110 Lower Housing

[0019] 110A Containment Space

[0020] 111 bottom

[0021] 111A bearing bore

[0022] 112th circumference wall

[0023] 114 Fixed Contact Section

[0024] 114A opening

[0025] 115 External Connection Terminal

[0026] 120 top cover

[0027] 120A opening

[0028] 121 base

[0029] 122 hook (locking part)

[0030] 122A Claw

[0031] 123-1 First Receiving Plate Section

[0032] 123-2 Second Receiving Plate Section

[0033] 130 rotating parts

[0034] 131 base

[0035] 132 Rotating Shaft

[0036] 132A Through Hole

[0037] 133 Cam Section

[0038] 140 Rotary Contact Component

[0039] 141 base

[0040] 142 contact spring section

[0041] 142A contact section

[0042] 143 opening

[0043] 150 spring components

[0044] 151 Fixing Part

[0045] 152 Elastic Deformation Section

[0046] 153 Elastic Contact Part

[0047] 154 was stuck

[0048] 155-1 First pressing plate section

[0049] 155-2 Second pressing plate section

[0050] Lz rotation center line Detailed Implementation

[0051] Hereinafter, an embodiment will be described with reference to the accompanying drawings. Furthermore, for convenience, in the following description, the Z-axis direction in the figures will be defined as the up-down direction, the X-axis direction as the front-back direction, and the Y-axis direction as the left-right direction. Specifically, the positive Z-axis direction will be defined as upward, the positive X-axis direction as forward, and the positive Y-axis direction as right.

[0052] (Overview of rotary electrical component 100)

[0053] Figure 1 This is a perspective view of the external appearance of a rotary electrical component 100 according to one embodiment. Figure 1 As shown, the rotary electrical component 100 is thin in the vertical direction (Z-axis direction) and has a roughly square shape when viewed from above (positive Z-axis direction). Figure 1As shown, the housing of the rotary electrical component 100 is configured to have a lower housing 110 and an upper cover 120 covering the upper part of the lower housing 110. A circular opening 120A is formed in the center of the upper cover 120. Furthermore, inside the lower housing 110, the rotary component 130 is configured to rotate about a rotation center line Lz extending in the vertical direction (Z-axis direction). The rotation shaft portion 132 of the rotary component 130 protrudes upward (in the positive Z-axis direction) from the opening 120A of the upper cover 120. Thus, the rotary electrical component 100 can receive rotational operation of the rotary component 130 by the operator via the rotation shaft portion 132.

[0054] (Structure of the rotary electrical component 100)

[0055] Figure 2 This is an exploded perspective view of a rotary electrical component 100 according to one embodiment. Figure 3 This is a perspective sectional view of a rotary electrical component 100 according to one embodiment.

[0056] like Figures 2-4 As shown, the rotary electrical component 100 includes a lower housing 110, an upper cover 120, a rotating component 130, a rotating contact component 140, and a spring component 150.

[0057] The lower housing 110 is a container-like component with a generally square shape and an opening at the top when viewed from above. The lower housing 110 has a horizontal, flat bottom 111 and a peripheral wall 112. The peripheral wall 112 extends upward (in the positive Z-axis direction) from the periphery of the bottom 111, surrounding a rotation center line Lz passing through the center of the bottom 111, forming a receiving space 110A on its inner side. A rotating component 130 and a rotating contact component 140 are housed in the receiving space 110A. An opening 112A, which is circular when viewed from above (in the positive Z-axis direction), is formed at the upper end of the peripheral wall 112. The lower housing 110 is formed by insert molding, for example, using a relatively rigid insulating material (e.g., rigid resin). A bearing hole 111A, which is circular when viewed from above and extends vertically through the bottom 111, is formed at the center of the bottom 111.

[0058] The upper cover 120 is a horizontal, flat metal plate with a base 121 that is approximately square (strictly speaking, an octagon with each of its four corners beveled) when viewed from above. The upper cover 120 is fixedly mounted to the upper surface of the lower housing 110, thereby covering the opening 112A of the peripheral wall portion 112 of the lower housing 110 with the base 121, and clamping the spring member 150 between the base 121 and the upper surface of the lower housing 110. Furthermore, when viewed from above (positive Z-axis direction), a circular opening 120A is formed in the center of the base 121 of the upper cover 120, through which the rotation shaft portion 132 of the rotating member 130 is inserted. The upper cover 120 is formed, for example, by machining a metal plate using a stamping process.

[0059] The rotating component 130 is a resin component that rotates in response to the operator's rotational operation. The rotating component 130 is disposed in the receiving space 110A of the lower housing 110 and is supported so that it can rotate relative to the lower housing 110 with a rotation center line Lz extending in the vertical direction (Z-axis direction) as the rotation center line.

[0060] The rotating component 130 has a central rotating shaft portion 132 and a base portion 131 surrounding the rotating shaft portion 132. The base portion 131 is a horizontal, disc-shaped portion extending outward from the rotating shaft portion 132 in the outer diameter direction. The rotating shaft portion 132 is a cylindrical portion extending vertically (Z-axis direction) from the central portion of the base portion 131. The upper part of the rotating shaft portion 132 passes through the opening 120A of the upper cover 120 and protrudes upward (in the positive Z-axis direction) beyond the upper cover 120, thereby allowing for rotational operation by the operator.

[0061] like Figure 3 As shown, the lower part of the rotating shaft 132 is inserted into the bearing hole 111A formed in the center of the bottom 111 of the lower housing 110, thereby the rotating component 130 is supported by the lower housing 110 to be able to rotate.

[0062] A cam portion 133 is formed on the upper surface of the base 131 to generate a clicking sensation during the rotation of the rotating component 130. The cam portion 133 is composed of a series of concave and convex portions formed continuously on the upper surface of the base 131 along an imaginary arc-shaped line surrounding the rotation center line Lz.

[0063] Furthermore, a through hole 132A, which is hexagonal when viewed from above and extends through the rotating shaft portion 132 in the vertical direction (Z-axis direction), is formed in the center of the rotating shaft portion 132. As a result, the rotating member 130 can insert the shaft portion (not shown) of the operating knob or the like into the through hole 132A.

[0064] The rotary contact component 140 is an annular component made of a metal plate. The rotary contact component 140 is fixedly mounted to the lower surface of the base 131 of the rotary component 130 and rotates integrally with the rotary component 130. The rotary contact component 140 has a base 141 and three contact spring portions 142. The base 141 is an annular portion surrounding the rotation shaft portion 132 of the rotary component 130. The three contact spring portions 142 are arranged at equal intervals (i.e., 120° intervals) on the outer side of the base 141. Each of the three contact spring portions 142 is an elastic arm-shaped portion integrally extending from the base 141 along its outer periphery, capable of elastic deformation in the vertical direction (Z-axis direction). Each of the three contact spring portions 142 has a contact portion 142A that convexes downwards (negative Z-axis direction) at its front end. The contact portion 142A is in elastic contact with the upper surface of the bottom 111 of the lower housing 110.

[0065] As the rotating contact component 140 rotates integrally with the rotating component 130, the three fixed contact portions 114 (see reference 114) located on the inner bottom surface (i.e., the upper surface of the bottom 111) of the receiving space 110A of the lower housing 110 are switched via the three contact spring portions 142. Figure 5 The electrical connection status of the rotating component 130 is known, thereby enabling the detection of the rotation direction and rotation angle of the rotating component 130. Furthermore, three openings 143 are provided at equal intervals along the circumferential direction at the base 141 of the rotating contact component 140 for fixing the rotating contact component 140 to the lower surface of the base 131 of the rotating component 130.

[0066] The spring component 150 is a horizontal, flat plate-shaped component made of a metal plate, disposed between the upper cover 120 and the lower housing 110. When viewed from above (positive Z-axis direction), the spring component 150 has a generally square shape (strictly speaking, an octagonal shape with each of its four corners beveled). When viewed from above (positive Z-axis direction), a generally circular opening 150A is formed in the center of the spring component 150. The spring component 150 has a fixing portion 151, an elastically deformable portion 152, and an elastically contacting portion 153.

[0067] The fixing portion 151 is a frame-shaped portion formed along the outer periphery of the opening 150A, surrounding the opening 150A. The fixing portion 151 is clamped between the base 121 of the upper cover 120 and the upper surface of the lower housing 110. The elastically deformable portion 152 is a portion extending from the fixing portion 151. The elastically contacting portion 153 is a portion formed at the end of the elastically deformable portion 152 and elastically contacts the cam portion 133 of the rotating member 130.

[0068] When the spring component 150 is in elastic contact with the cam portion 133 of the rotating component 130, the elastic deformation portion 152 elastically deforms as the rotating component 130 rotates, and at the same time the elastic contact portion 153 moves up and down along the cam portion 133.

[0069] At this time, when the elastic contact portion 153 passes over the protrusion of the cam portion 133, the spring component 150 increases the rotational load of the rotating component 130, thereby accelerating the rotation of the rotating component 130. Then, when the elastic contact portion 153 is inserted into the recess of the cam portion 133, the rotation of the rotating component 130 is stopped abruptly.

[0070] Thus, the spring component 150 can provide a locking sensation at predetermined rotation angles in response to the rotational operation of the rotating component 130.

[0071] In this embodiment, as an example, the spring member 150 has a pair of elastically deformable portions 152 disposed inside the opening 150A. Each of the pair of elastically deformable portions 152 has a curved (approximately semi-circular) shape along the inner circumference of the opening 150A, and its two ends are connected to the fixing portion 151. Furthermore, an elastic contact portion 153 is provided protruding downward from the middle of each of the front and rear pairs of elastically deformable portions 152. That is, the spring member 150 has a front and rear pair of elastic contact portions 153.

[0072] (Hook 122 in the engaged state)

[0073] Figure 4 This is a perspective cross-sectional view showing the engaged state of the hook 122 of a rotary electrical component 100 according to one embodiment.

[0074] like Figure 4 As shown, the upper cover 120 has downward-hanging hooks 122 on the left and right edges of the base 121. The hooks 122 have vertical wall-like structures disposed on the outer sides of the left and right sides of the lower housing 110. The hooks 122 have a pair of front and rear claws 122A at their lower ends. The claws 122A are disposed on the lower side (negative Z-axis side) of the lower surface of the lower housing 110 by bending at a right angle toward the inward side (lower housing 110 side).

[0075] The upper cover 120 clamps the lower housing 110 from the left and right sides via a pair of hooks 122. Additionally, the upper cover 120 clamps the lower housing 110 from the top and bottom sides via a base 121 and four claws 122A. Thus, the upper cover 120 is fixedly mounted to the lower housing 110 and can restrict the relative movement (position offset) of the lower housing 110 relative to the upper cover 120 in the forward / backward direction (X-axis direction), the left / right direction (Y-axis direction), and the up / down direction (Z-axis direction).

[0076] (Structure of the inner bottom surface of containment space 110A)

[0077] Figure 5 This is a top view of the lower housing 110 of a rotary electrical component 100 according to one embodiment. (See attached image.) Figure 5 As shown, on the inner bottom surface (i.e., the upper surface of the bottom 111) of the receiving space 110A of the lower housing 110, three fixed contact portions 114 made of metal plates are arranged circumferentially on the same circumference. Each of the three fixed contact portions 114 has a fan-shaped configuration, forming a ring when viewed from above. Furthermore, two of the three fixed contact portions 114 are arranged circumferentially to form multiple "non-conductive portions" that function as non-conductive portions of the fixed contact portions 114 of the rotating contact member 140. Figure 5 The example shown has four openings 114A.

[0078] In addition, the three fixed contact parts 114 are respectively connected to each of the three external connection terminals 115 that are provided outward from the side of the rear side (negative side of the X-axis) of the lower housing 110.

[0079] A circular rotating contact member 140 is disposed on the upper side of the inner bottom surface of the receiving space 110A, and the three contact portions 142A of the rotating contact member 140 elastically contact the inner bottom surface of the receiving space 110A. Furthermore, as the rotating contact member 140 rotates, the three contact portions 142A slide circumferentially on the inner bottom surface of the receiving space 110A. In one embodiment, as the rotating contact member 140 rotates, the contact state of the three contact portions 142A relative to the three fixed contact portions 114 changes, thereby changing the conduction state of the three fixed contact portions 114 via the rotating contact member 140, thereby enabling the detection of the rotation direction and rotation angle of the rotating member 130.

[0080] (Anti-rotation mechanism and pressing mechanism)

[0081] Figure 6 and Figure 7 This is a diagram illustrating the anti-rotation mechanism and crimping mechanism provided in a rotary electrical component 100 according to one embodiment. Figure 6 Rotary electrical component 100 indicates that the cover 120 is not installed. Figure 7 This indicates the state of the rotary electrical component 100 with the upper cover 120 installed. Figure 8 This is a cross-sectional view of a rotary electrical component 100 according to one embodiment. Figure 8 This represents a cross-section through the first and second corners of the lower housing 110, which will be described later.

[0082] like Figure 6As shown, the spring component 150 overlaps with the upper surface of the lower housing 110. Here, the spring component 150 has a pair of claw-shaped locking portions 154 protruding outward (to the side opposite to the lower housing 110) at the left and right edges of the fixing portion 151.

[0083] like Figure 7 As shown, when the upper cover 120 is installed on the lower housing 110, the left and right pairs of hooks 122 of the upper cover 120 are respectively engaged between the front and rear pairs of locking portions 154 of the spring component 150. Here, the spacing between the front and rear pairs of locking portions 154 is equal to the width of the hook 122 in the front-rear direction (X-axis direction). Therefore, the hook 122 can be engaged between the front and rear pairs of locking portions 154. Therefore, by engaging between the front and rear pairs of locking portions 154, the hook 122 can stop the rotation of the spring component 150 about the rotation center line Lz.

[0084] That is, in this embodiment, the spring member 150 is provided with a pair of front and rear locking portions 154 and the upper cover 120 is provided with a hook 122 (an example of a "locking portion") to lock the rotation of the spring member 150.

[0085] In addition, such as Figure 6 As shown, the spring component 150 has a first pressing plate portion 155-1 and a second pressing plate portion 155-2 extending outward from the outer periphery of the fixing portion 151 (the first receiving plate portion 123-1 and the second receiving plate portion 123-2 described later).

[0086] Specifically, the first pressing plate portion 155-1 has a tongue-shaped part extending outward (to the right oblique front) from the right front corner (corner on the positive side of the X-axis and the positive side of the Y-axis) of the outer periphery of the fixing portion 151.

[0087] Furthermore, the second pressing plate portion 155-2 has a tongue-shaped portion extending outward (slanting left rear) from the left rear corner (the corner on the negative side of the X-axis and the negative side of the Y-axis) of the outer periphery of the fixing portion 151.

[0088] That is, the first pressing plate portion 155-1 and the second pressing plate portion 155-2 are arranged diagonally across the rotation center (rotation center line Lz).

[0089] On the other hand, such as Figure 7 As shown, as an example of a "receiving plate portion" extending downward (in the negative Z-axis direction) from the outer periphery of the base 121, the upper cover 120 has a first receiving plate portion 123-1 and a second receiving plate portion 123-2.

[0090] Specifically, the first receiving plate portion 123-1 has a vertical wall extending downward (in the negative direction of the Z-axis) from the right front corner (the corner on the positive side of the X-axis and the positive side of the Y-axis) of the outer periphery of the base portion 121.

[0091] In addition, the second receiving plate portion 123-2 has a vertical wall extending downward (in the negative direction of the Z axis) from the left rear corner (the corner on the negative side of the X-axis and the negative side of the Y-axis) of the outer periphery of the base portion 121.

[0092] That is, the first receiving plate part 123-1 and the second receiving plate part 123-2 are arranged diagonally across the rotation center (rotation center line Lz).

[0093] And, as Figure 8 As shown, when the upper cover 120 is installed onto the lower housing 110, the front end of the first pressing plate portion 155-1 is pressed against the inner surface of the first receiving plate portion 123-1, and the front end of the second pressing plate portion 155-2 is pressed against the inner surface of the second receiving plate portion 123-2, so that the spring member 150 is clamped between the first receiving plate portion 123-1 and the second receiving plate portion 123-2 and is pressed together.

[0094] Therefore, the rotary electrical component 100 of one embodiment can suppress the wobbling of the spring component 150 during the rotation operation of the rotary component 130, and thus can suppress noise generated due to the wobbling of the spring component 150.

[0095] In addition, the radial length of the first pressing plate portion 155-1 is set such that the position of the front end of the first pressing plate portion 155-1 is slightly radially outward than the inner surface of the first receiving plate portion 123-1, so that the front end of the first pressing plate portion 155-1 can be pressed onto the inner surface of the first receiving plate portion 123-1.

[0096] Similarly, the radial length of the second pressing plate portion 155-2 is set such that the position of the front end of the second pressing plate portion 155-2 is slightly radially outward than the inner surface of the second receiving plate portion 123-2, so that the front end of the second pressing plate portion 155-2 can be pressed onto the inner surface of the second receiving plate portion 123-2.

[0097] In addition, such as Figure 6 and Figure 7 As shown, the lower housing 110 has a quadrilateral shape with four corners when viewed from above. The first receiving plate portion 123-1 and the first pressing plate portion 155-1 are disposed at the first corner (right front corner) of the lower housing 110, and the second receiving plate portion 123-2 and the second pressing plate portion 155-2 are disposed at the second corner (left rear corner) of the lower housing 110.

[0098] Thus, the rotary electrical component 100 of one embodiment can press the spring component 150 against the first and second corners of the lower housing 110, which are diagonally opposite each other, thereby effectively suppressing the wobbling of the spring component 150 during the rotation operation of the rotary component 130.

[0099] In addition, such as Figure 6 As shown, the front ends of the first pressing plate portion 155-1 and the second pressing plate portion 155-2 are each formed with a slit 155A along the radial direction to form a front segmented shape.

[0100] Therefore, the rotary electrical component 100 according to one embodiment can make the first pressing plate portion 155-1 and the second pressing plate portion 155-2 appropriately elastic, so that the pressing stress is not transmitted to the fixing portion 151 through the first pressing plate portion 155-1 and the second pressing plate portion 155-2.

[0101] In addition, such as Figure 7 and Figure 8 As shown, the upper cover 120 is made of metal, and the first receiving plate portion 123-1 and the second receiving plate portion 123-2 of the upper cover 120 are formed by bending downward at right angles at the boundary portion with the base portion 121.

[0102] Thus, the rotary electrical component 100 of one embodiment can form a first receiving plate portion 123-1 and a second receiving plate portion 123-2 by performing relatively simple processing on the upper cover 120.

[0103] The above describes one embodiment of the present invention in detail, but the present invention is not limited to these embodiments. Various modifications or alterations can be made within the scope of the spirit of the present invention as described in the patent claims.

[0104] For example, in this embodiment, two sets of pressing mechanisms consisting of a "receiving plate portion" and a "pressing plate portion" are provided, but it is not limited to this, and one or more sets may also be provided.

Claims

1. A rotary electrical component, characterized in that, have: The lower housing has a bottom, a peripheral wall extending upward from the periphery of the bottom, and an opening formed at the upper end of the peripheral wall. The upper cover is installed on the upper side of the lower housing in a manner that covers the opening; The outer shell is composed of the lower shell and the upper cover, forming an internal receiving space; A rotating component, at least a portion of which is housed in the housing space, is supported such that it can rotate relative to the housing with the vertical direction as the center of rotation. The cam portion is composed of concave and convex portions continuously formed along an imaginary arc-shaped line surrounding the center of rotation in the rotating component; The spring component comprises a fixing portion clamped between the lower housing and the upper cover, an elastically deformable portion extending from the fixing portion, and an elastically contacting portion formed in the elastically deformable portion and elastically contacting the cam portion; and The anti-rotation mechanism comprises a locking part disposed on the fixing part of the spring component and a locking part disposed on the housing and locking the locking part. The rotary electrical component includes a crimping mechanism, which consists of a receiving plate portion extending downward from the outer periphery of the upper cover and a crimping plate portion extending from the fixing portion of the spring component toward the receiving plate portion and crimped onto the receiving plate portion.

2. The rotary electrical component according to claim 1, characterized in that, The receiving plate portion is composed of a first receiving plate portion and a second receiving plate portion arranged diagonally across the rotation center, and the pressing plate portion is composed of a first pressing plate portion and a second pressing plate portion arranged diagonally across the rotation center. The first pressing plate portion is pressed onto the first receiving plate portion, and the second pressing plate portion is pressed onto the second receiving plate portion. The spring component is clamped between the first receiving plate portion and the second receiving plate portion and is pressed together.

3. The rotary electrical component according to claim 1, characterized in that, The lower shell is quadrilateral in shape with four corners when viewed from above. The receiving plate portion and the pressing plate portion are disposed at one corner.

4. The rotary electrical component according to claim 1, characterized in that, The pressing plate portion has a slit formed radially to form a front-segmented shape.

5. The rotary electrical component according to claim 1, characterized in that, The upper cover is made of metal. The receiving plate is formed by bending.

Images