Gas meter

Abstract

To provide a gas meter with which an attachment part for attaching a nameplate to a frame does not protrude forward from the plate surface of the nameplate, the ease of work is good when attaching the nameplate to the frame, and the nameplate does not come off the frame due to vibration, etc.SOLUTION: A nameplate 12 includes: a first engaging part 121 including a first slant part 121A extending from the top end of a plate surface 12A diagonally upward on the rear side and a notch part 121B formed in the first slant part 121A; and a second engaging part 122 including a second slant part 122A extending from the lower end of the plate surface 121A diagonally downward on the rear side. A frame 11 includes: a first pawl member 111 provided so as not to protrude forward from the front, for locking the first engaging part 121 in the lateral direction by engaging with a notch 121B and locking the first engaging part 121 in the longitudinal and the vertical directions by engaging with the lower edge of the notch 121B; and a second pawl member 112 provided so as not to protrude forward from the front, for locking the second engaging part 122 in the longitudinal and the vertical directions.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a gas meter. [Background technology]

[0002] Known gas meters that accumulate and display the amount of fuel gas used include those in which display items such as product number and flow rate unit are printed or laser processed on the front of a frame that holds a mechanical counter (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-25445 Summary of the Invention [Problem to be solved by the invention]

[0004] We consider the case where a metal dial plate with display information printed or laser-processed onto it is attached to the front of the frame that holds the mechanical counter, with the aim of improving the visibility of the display information. In this case, the transparent plate of the front cover is placed close to the front of the dial plate, so the issue is that the attachment part for attaching the dial plate to the frame does not protrude forward from the face of the dial plate. Other issues are that the dial plate must be easily attached to the frame, and that the dial does not fall off the frame due to vibration, etc.

[0005] In view of the above circumstances, the present invention aims to provide a gas meter in which the mounting portion for attaching the dial to the frame does not protrude forward from the face of the dial, which makes it easy to attach the dial to the frame, and which prevents the dial from falling off the frame due to vibration, etc. [Means for solving the problem]

[0006] The gas meter of the present invention comprises a front surface provided with a first display window that allows a display unit that displays gas usage amount to be viewed from the front, a frame attached to a gas meter body, and a plate surface provided with a second display window that displays display items and allows the display unit to be viewed from the front, the plate surface being attached to the frame so that the plate surface covers the front surface, the plate member comprising a first inclined portion that extends obliquely rearward from one of the upper and lower ends of the plate surface, and a notch formed in the first inclined portion. The frame has a first locking portion and a second locking portion having a second inclined portion extending diagonally rearward from the other of the upper and lower ends of the plate surface, and the frame has a first claw member that is arranged so as not to protrude forward from the front surface and that locks the first locking portion in the horizontal direction by fitting into the notch portion and that locks the first locking portion in the front-to-back and vertical directions by engaging with the lower edge of the notch portion, and a second claw member that is arranged so as not to protrude forward from the front surface and that locks the second locking portion in the front-to-back and vertical directions. [Effects of the Invention]

[0007] According to the present invention, the mounting portion for attaching the dial to the frame does not protrude forward from the face of the dial, the dial can be attached to the frame with good workability, and the dial will not fall off the frame due to vibrations or the like. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a partially cutaway front view showing a gas meter according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the frame assembly shown in FIG. [Figure 3] FIG. 3 is a side view of the frame assembly shown in FIGS. [Figure 4] FIG. 4 is a perspective view showing the dial shown in FIGS. 1 to 3. FIG. [Figure 5] FIG. 5 is a perspective view showing the frame shown in FIGS. 1 to 3. As shown in FIG. [Figure 6]6 is an enlarged perspective view of the first claw member and the first locking portion shown in FIG. 2. FIG. [Figure 7] 7 is an enlarged perspective view of the second claw member and the second locking portion shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below in accordance with preferred embodiments. Note that the present invention is not limited to the embodiments described below, and the embodiments can be modified as appropriate without departing from the spirit of the present invention. In addition, in the embodiments described below, some components are omitted from illustration and description, but for the details of the omitted technologies, publicly known or well-known technologies are applied as appropriate within the scope of not causing any contradictions with the content described below.

[0010] FIG. 1 is a partially cutaway front view showing a gas meter 1 according to one embodiment of the present invention. In this figure, the gas meter 1 is shown with the upper part of the front cover 3 cut away. The gas meter 1 shown in this figure is a membrane type gas meter, and is provided with a display mechanism (not shown) that displays the amount of fuel gas used on a display unit 4, and a frame assembly 10, at the top of the gas meter main body 2. The display mechanism is supported by the frame assembly 10, and the frame assembly 10 is attached to the top of the gas meter main body 2. The frame assembly 10 is covered by the top of the front cover 3.

[0011] The frame assembly 10 is provided with display windows 11W and 12W that allow the display unit 4 to be viewed from the front. A transparent cover (not shown) is provided on the top of the front cover 3, and the display unit 4 can be viewed from the front through the display windows 11W and 12W and the transparent cover.

[0012] A gas inlet 21 and a gas outlet 22 are provided on the rear side of the frame assembly 10 at the top of the gas meter main body 2. A measuring unit (not shown) including a movable membrane, a valve, a crank mechanism, etc. is provided at the bottom of the gas meter main body 2. The display mechanism updates the amount of fuel gas used, which is displayed on the display unit 4, in conjunction with the operation of the crank mechanism of the measuring unit.

[0013] FIG. 2 is a perspective view of the frame assembly 10 shown in FIG. 1. FIG. 3 is a side view of the frame assembly 10 shown in FIGS. 1 and 2. As shown in these figures, the frame assembly 10 includes a frame 11 and a dial 12. The frame 11 is a housing that holds and houses a display mechanism. The frame 11 is a rectangular housing that is open on the rear side (back side), and includes a front side 11A (see FIG. 3), an upper side 11B, a lower side 11C (see FIG. 3), a right side 11D, and a left side 11E (see FIG. 5), all of which are flat. The side surface located on the right side when viewed from the front (front side) of the gas meter 1 is the right side 11D, and the side surface located on the left side when viewed from the front of the gas meter 1 is the left side 11E.

[0014] The frame 11 includes a pair of left and right first claw members 111, a second claw member 112, a first holding portion 113, a second holding portion 114 (see FIG. 2), and bracket portions 115 and 117 (see FIG. 3). The bracket portions 115 and 117 are brackets for fastening the frame assembly 10 to the gas meter main body 2. The bracket portion 115 is provided to extend rightward from a right side surface 11D of the frame 11, and is fastened to the gas meter main body 2. The bracket portion 117 is provided to extend leftward from a left side surface 11E of the frame 11, and is fastened to the gas meter main body 2.

[0015] The pair of left and right first claw members 111 are provided on the upper surface 11B of the frame 11. The pair of left and right first claw members 111 are arranged at positions symmetrical with respect to a vertical line passing through the lateral center of the frame assembly 10. Furthermore, the pair of left and right first claw members 111 are arranged so as not to protrude forward beyond the front surface 11A of the frame 11.

[0016] The second claw member 112 is provided on the lower surface 11C of the frame 11. The second claw member 112 is disposed in the lateral center of the frame assembly 10. The second claw member 112 is also disposed so as not to protrude forward beyond the front surface 11A of the frame 11.

[0017] The first holding portion 113 is provided on the right side surface 11D of the frame 11. The first holding portion 113 is a rectangular plate extending rightward from the front and bottom end of the right side surface 11D (the right and bottom end of the front surface 11A). The second holding portion 114 is provided on the left side surface 11E of the frame 11. The second holding portion 114 is a rectangular plate extending leftward from the front and bottom end of the left side surface 11E (the left and bottom end of the front surface 11A).

[0018] A plurality of rectangular display windows 11W (see FIG. 2) are formed in the vertical center of the front surface 11A of the frame 11. The display windows 11W are arranged to match the position of the display unit 4. Note that a single display window may be provided by integrating the plurality of display windows 11W.

[0019] The dial 12 is a plate-shaped member made of metal such as aluminum, and has a rectangular plate surface 12A on which display items such as the model number of the gas meter 1 and flow rate units are marked by laser processing, printing, or the like. In addition, a plurality of rectangular display windows 12W are formed in the vertical center of the dial 12. Each display window 12W has the same shape as each display window 11W and is located in the same position as each display window 11W. Note that a single display window may be provided by integrating the multiple display windows 12W.

[0020] The face 12A of the dial 12 faces the front face 11A of the frame 11. The horizontal dimension of the face 12A of the dial 12 is the same as the horizontal dimension of the front face 11A of the frame 11, and the vertical dimension of the face 12A of the dial 12 is slightly larger than the vertical dimension of the front face 11A of the frame 11. Furthermore, the face 12A of the dial 12 is arranged overlapping the front face 11A of the frame 11 in the front-to-rear direction so as to cover the entire front face 11A of the frame 11.

[0021] The dial 12 has a first locking portion 121, a second locking portion 122, a first side piece 123, and a second side piece 124 (see FIG. 2). The first locking portion 121 is provided on the upper part of the dial 12, and the second locking portion 122 is provided on the lower part of the dial 12. The first side piece 123 is provided on the right side of the dial 12, and the second side piece 124 is provided on the left side of the dial 12.

[0022] The first locking portion 121 includes a first inclined portion 121A extending obliquely upward from the upper end of the plate surface 12A toward the rear side (back side), and a pair of left and right notched portions 121B (see FIG. 2) formed in the first inclined portion 121A. As will be described in detail later, each of the first claw members 111 engages with each of the notched portions 121B.

[0023] The second locking portion 122 includes a second inclined portion 122A extending diagonally downward toward the rear from the lower end of the plate surface 12A, and a vertical portion 122B extending vertically downward from the tip (lower end) of the second inclined portion 122A. As will be described in detail later, the second claw member 112 engages with the center portion in the longitudinal direction (horizontal direction) of the vertical portion 122B.

[0024] The first side piece 123 is an inclined plate piece that extends rightward and diagonally rearward from the right end of the plate surface 12 A. The first side piece 123 is disposed so that the lower end of the first side piece 123 abuts against the upper end of the first holding portion 113 of the frame 11, and is held by the first holding portion 113.

[0025] The second side piece 124 is an inclined plate piece that extends leftward and diagonally rearward from the left end of the plate surface 12 A. The second side piece 124 is disposed so that the lower end of the second side piece 124 abuts against the upper end of the second holding portion 114 of the frame 11, and is held by the second holding portion 114.

[0026] 4 is a perspective view of the dial 12 shown in FIGS. 1 to 3. As shown in this figure, a pair of left and right cutout portions 121B are arranged at positions symmetrical with respect to a vertical line passing through the lateral center of the frame assembly 10. Each cutout portion 121B is a rectangular cutout portion recessed from the upper end of the first inclined portion 121A.

[0027] Fig. 5 is a perspective view showing the frame 11 shown in Figs. 1 to 3. As shown in this figure, the first claw member 111 includes a shaft portion 111A, a claw portion 111B, and a base portion 111C. The base portion 111C is a gate-shaped support base when viewed from the front, and is provided on the upper surface 11B of the frame 11.

[0028] The shaft 111A is an elastic part that extends forward from the front end of the base 111C. The width (horizontal dimension) of the shaft 111A and the width (horizontal dimension) of the notch 121B are set so that the shaft 111A and the notch 121B fit together in the horizontal direction. The shaft 111A is also arranged so as to fit together in the horizontal direction with the notch 121B.

[0029] The claw portion 111B is a protrusion that protrudes downward from the front end (tip) of the shaft portion 111A and has a right-angled triangular shape in a side view. The inclined surface 111E (see FIG. 6) of the claw portion 111B is located rearward of the vertical front surface of the claw portion 111B. The inclined surface 111E of the claw portion 111B and the first inclined portion 121A of the dial 12 are parallel to each other and abut against each other.

[0030] The second claw member 112 includes a shaft portion 112A, a claw portion 112B, and a base portion 112C. The base portion 112C is a gate-shaped support base when viewed from the front, and is provided on the lower surface 11C of the frame 11.

[0031] The shaft 112A is an elastic part that extends forward from the front end of the base 112C. The shaft 112A is arranged so that the upper surface of the shaft 112A and the lower end of the vertical part 122B of the dial 12 come into contact with each other.

[0032] The claw portion 112B is a protruding portion that protrudes upward from the front end (tip) of the shaft portion 112A and has a right-angled shape in a side view. The inclined surface 112E (see FIG. 7) of the claw portion 112B is located forward of the vertical rear surface 112D (see FIG. 7) of the claw portion 112B. The vertical rear surface 112D of the claw portion 112B is located so as to abut against the front surface of the vertical portion 122B of the dial 12.

[0033] Fig. 6 is an enlarged perspective view of the first claw member 111 and the first locking portion 121 shown in Fig. 2. As shown in this figure, the shaft portion 111A of the first claw member 111 extends forward from the front end of the base portion 111C and is inserted into the notch portion 121B of the dial 12. Here, the shaft portion 111A and the notch portion 121B fit together in the lateral direction, so that the first locking portion 121 is locked in the lateral direction by the shaft portion 111A.

[0034] The inclined surface 111E of the claw portion 111B of the first claw member 111 abuts against the lower edge of the notch portion 121B of the first inclined portion 121A, thereby locking the first locking portion 121 in the front-rear and vertical directions by the claw portion 111B.

[0035] Here, first locking portion 121 is composed of first inclined portion 121A extending diagonally upward and rearward from the upper end of plate surface 12A of dial 12, and a pair of left and right notches 121B formed in first inclined portion 121A, and therefore does not protrude forward from plate surface 12A. In addition, the front surface of claw portion 111B is positioned rearward from front surface 11A of frame 11, and therefore first claw member 111 does not protrude forward from plate surface 12A.

[0036] 7 is an enlarged perspective view of the second claw member 112 and the second locking portion 122 shown in FIG. 2. As shown in this figure, the shaft portion 112A of the second claw member 112 extends forward from the front end of the base portion 112C, passing under the vertical portion 122B of the dial 12. Here, the upper surface of the shaft portion 112A abuts against the lower end of the vertical portion 122B, thereby locking the second locking portion 122 in the vertical direction by the shaft portion 112A.

[0037] A vertical rear surface 112D of the claw portion 112B of the second claw member 112 abuts against a front surface of the vertical portion 122B of the second locking portion 122. This causes the second locking portion 122 to be locked in the front-rear direction by the claw portion 112B.

[0038] Here, the second locking portion 122 is composed of a second inclined portion 122A extending diagonally downward toward the rear from the lower end of the plate surface 12A of the dial 12, and a vertical portion 122B extending vertically downward from the lower end of this second inclined portion 122A, and therefore does not protrude forward from the plate surface 12A. In addition, the tip of the claw portion 112B is positioned rearward from the front surface 11A of the frame 11, and therefore the second claw member 112 does not protrude forward from the plate surface 12A.

[0039] A method for assembling the frame assembly 10 will be described below. First, the pair of left and right first claw members 111 and the first locking portions 121 are engaged with each other. Specifically, the shaft portions 111A of each first claw member 111 are inserted into the respective notched portions 121B, and the inclined surfaces 111E of the claw portions 111B of each first claw member 111 are brought into contact with the lower edge portions of the respective notched portions 121B in the first inclined portions 121A. As a result, the shaft portions 111A of each first claw member 111 lock with the respective notched portions 121B in the horizontal direction, and the claw portions 111B of each first claw member 111 lock with the lower edge portions of the respective notched portions 121B in the first inclined portions 121A in the front-rear and vertical directions.

[0040] Next, the second claw member 112 and the second locking portion 122 are engaged. Specifically, the lower end of the vertical portion 122B of the second locking portion 122 is brought into contact with the inclined surface 112E of the claw portion 112B of the second claw member 112, and the second locking portion 122 is moved relatively rearward in a state in which the shaft portion 112A of the second claw member 112 and the shaft portion 111A of the first claw member 111 are elastically deformed. When the vertical portion 122B climbs over the inclined surface 112E of the claw portion 112B, the shaft portion 112A of the second claw member 112 locks the vertical portion 122B in the vertical direction, and the claw portion 112B of the second claw member 112 locks the vertical portion 122B in the front-to-rear direction.

[0041] As described above, in the gas meter 1 according to this embodiment, the frame 11 having the front surface 11A with the display window 11W is attached to the gas meter main body 2. In addition, the dial 12 having the face 12A on which display items are written and on which the display window 12W is provided is attached to the frame 11 so that the face 12A covers the front surface 11A.

[0042] The dial 12 has a first locking portion 121 and a second locking portion 122. The first locking portion 121 has a first inclined portion 121A that extends diagonally upward from the upper end of the plate surface 12A toward the rear side, and a notch 121B formed in the first inclined portion 121A. The second locking portion 122 has a second inclined portion 122A that extends diagonally downward from the lower end of the plate surface 12A toward the rear side.

[0043] The frame 11 includes a first claw member 111 and a second claw member 112. The first claw member 111 is provided so as not to protrude forward from the front surface 11A of the frame 11, and engages with the notch portion 121B to lock the first locking portion 121 in the horizontal direction, and engages with the lower edge of the notch portion 121B to lock the first locking portion 121 in the front-rear direction and the vertical direction. The second claw member 112 is provided so as not to protrude forward from the front surface 11A of the frame 11, and locks the second locking portion 122 in the front-rear direction and the vertical direction.

[0044] As a result, the attachment portion for attaching the dial 12 to the frame 11 does not protrude forward from the face 12A of the dial 12, preventing interference between the frame assembly 10 and the front cover 3. Also, the operation of attaching the dial 12 to the frame 11 can be achieved by engaging the first claw member 111 with the first locking portion 121 and engaging the second claw member 112 with the second locking portion 122. Furthermore, by locking the first locking portion 121 in the front-to-back, horizontal, and vertical directions with the first claw member 111 and locking the second locking portion 122 in the front-to-back and vertical directions with the second claw member 112, the dial 12 can be prevented from falling off the frame 11 due to vibrations, etc.

[0045] Furthermore, in the gas meter 1 according to this embodiment, a pair of left and right cutout portions 121B are formed in the first inclined portion 121A at a distance from each other in the horizontal direction, and a pair of left and right first claw members 111 are provided on the upper surface 11B of the frame 11 in alignment with the positions of the cutout portions 121B. Furthermore, the first claw member 111 includes a shaft portion 111A and a claw portion 111B, and the shaft portion 111A is supported on the upper surface 11B of the frame 11 and fits into the cutout portion 121B, and the claw portion 111B is provided at the tip of the shaft portion 111A and engages with the lower edge of the cutout portion 121B. Furthermore, the second claw member 112 has an axis portion 112A and a claw portion 112B, and the axis portion 112A is supported on the lower surface 11C of the frame 11 and holds the lower end of the second locking portion 122, and the claw portion 112B is provided at the tip of the axis portion 112A and engages with the lower end of the second locking portion 122.

[0046] This enables the assembly work to be performed by engaging the pair of left and right first claw members 111 with the pair of left and right cutout portions 121B located at the upper end of the dial 12 to lock the first locking portion 121 vertically, horizontally, and front-to-back, and then engaging the second claw member 112 with the second locking portion 122 located at the lower end of the dial 12 to lock the second locking portion 122 vertically and front-to-back.

[0047] Further, second locking portion 122 has vertical portion 122B extending vertically from the tip of second inclined portion 122A, and second claw member 112 has rear surface 112D that engages with vertical portion 122B and inclined surface 112E located forward of rear surface 112D. This enables the assembly work to be performed by engaging first claw member 111 with notch portion 121B to lock first locking portion 121 vertically and horizontally and front-to-back, and then moving second locking portion 122 relatively rearward while bringing vertical portion 122B into contact with inclined surface 112E, and causing vertical portion 122B to climb over inclined surface 112E to engage vertical portion 122B with rear surface 112D.

[0048] Furthermore, in the gas meter 1 according to this embodiment, the dial 12 includes a first side piece 123 that protrudes from the right side of the plate surface 12A, and a second side piece 124 that protrudes from the left side of the plate surface 12A. In contrast, the frame 11 includes a first retaining portion 113 that protrudes from the right side of the front surface 11A and holds the first side piece 123, and a second retaining portion 114 that protrudes from the left side of the front surface 11A and holds the second side piece 124. This allows the dial 12 to remain held by the frame 11 by the first retaining portion 113 and the second retaining portion 114, even if the second claw member 112 is damaged.

[0049] The present invention has been described above based on the above-mentioned embodiment, but the present invention is not limited to the above-mentioned embodiment, and modifications may be made within the scope of the spirit of the present invention, and publicly known or well-known technologies may be combined as appropriate.

[0050] For example, in the above-described embodiment, the first claw member 111 is provided on the upper surface 11B of the frame 11, the second claw member 112 is provided on the lower surface 11C of the frame 11, the first locking portion 121 is provided on the upper part of the dial 12, and the second locking portion 122 is provided on the lower part of the dial 12. However, the first claw member 111 may be provided on the lower surface 11C of the frame 11, the second claw member 112 may be provided on the upper surface 11B of the frame 11, the first locking portion 121 may be provided on the lower part of the dial 12, and the second locking portion 122 may be provided on the upper part of the dial 12. In this case, the first inclined portion 121A may be provided so as to extend diagonally downward toward the rear from the lower end of the plate surface 12A, and the second inclined portion 122A may be provided so as to extend diagonally upward toward the rear from the upper end of the plate surface 12A.

[0051] In the above-described embodiment, a pair of left and right first claw members 111 and a pair of left and right cutout portions 121B are provided. However, one first claw member 111 and one cutout portion 121B may be provided, or three or more first claw members 111 and three or more cutout portions 121B may be provided. Also, a plurality of second claw members 112 may be provided. [Explanation of symbols]

[0052] 1: Gas meter 2: Gas meter body 4: Display part 11 :フレーム 11A: Front 11B: Above 11C: Below 11W: Indicator (the first indicator) 12: Text board (board material) 12A: Board 12W: Indicator (second indicator) 111: 1st claw member 111A: Shaft (1st shaft) 111B: Claw (1st claw) 112: Second claw member 112A: Shaft (Second Shaft) 112B: Claw (second claw) 112D: Back (vertical) 112E: Slope 113: First holding unit 114: Second holding unit 121: First stop 121A: 1st inclined portion 121B: Cutting 122: Second stop 122A: Second inclined portion 122B: Hemiplegia 123: 1st side panel 124: Second side panel

Claims

1. a frame attached to the gas meter body, the frame having a front surface provided with a first display window that allows a display unit that displays the amount of gas used to be visible from the front; a plate member having a plate surface on which display items are written and a second display window that allows the display unit to be viewed from the front, the plate surface being attached to the frame so that the plate surface covers the front surface; Equipped with The plate member is a first engaging portion including a first inclined portion extending obliquely rearward from one of the upper end and the lower end of the plate surface, and a notch formed in the first inclined portion; a second engaging portion including a second inclined portion extending obliquely rearward from the other of the upper end and the lower end of the plate surface; Equipped with The frame is a first claw member that is provided so as not to protrude forward from the front surface, that engages with the notch portion to lock the first locking portion in the horizontal direction, and that engages with a lower edge of the notch portion to lock the first locking portion in the front-rear direction and the vertical direction; a second claw member that is provided so as not to protrude forward from the front surface and that engages the second engaging portion in the front-rear direction and the vertical direction; A gas meter comprising:

2. the first inclined portion extends obliquely upward from the upper end of the plate surface toward the rear side, the second inclined portion extends obliquely downward toward the rear from the lower end of the plate surface, a plurality of the notches are formed in the first inclined portion at intervals in the lateral direction; a plurality of the first claw members are provided on the upper surface of the frame in alignment with the positions of the notches; The second claw member is provided on the lower surface of the frame, The first claw member is a first shaft portion supported on the upper surface of the frame and fitted into the notch portion; a first claw portion provided at a tip of the first shaft portion and engaging with a lower edge of the notch portion; Equipped with The second claw member is a second shaft portion supported on the lower surface of the frame and holding a lower end of the second engaging portion; a second pawl portion provided at a tip of the second shaft portion and engaging with a lower end of the second locking portion; The gas meter according to claim 1 , comprising:

3. The second locking portion is a vertical portion extending vertically from a tip of the second inclined portion, The second claw member is a longitudinal surface that engages with the longitudinal portion; a slope located forward of the vertical surface; The gas meter according to claim 1 or 2, comprising:

4. The plate member is a first side piece protruding from one side of the plate surface; a second side piece protruding from the other side of the plate surface; Equipped with The frame is a first holding portion that protrudes from one side portion of the front surface and holds the first side piece; a second holding portion that protrudes from the other side portion of the front surface and holds the second side piece; The gas meter according to claim 1 or 2, comprising:

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