JP3514420B2 - Frame connection structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame connecting structure in which frame members can be integrally connected. In addition,
The "frame body" referred to in the present specification means a receiving frame body for accommodating various devices such as a water meter and a water supply device, a joint frame body for height adjustment,
The bottom frame and the like installed on the lower surface of the receiving frame or the joint frame are collectively referred to.

[0002]

2. Description of the Related Art A housing for accommodating various devices is often constructed by using a frame body. For example, a water meter housing for protecting a water supply device for waterworks buried in the ground is Usually, it is composed of a receiving frame that houses a water supply device such as a water meter and a water stopcock, and a lid that is openably and closably attached to the upper surface of the receiving frame. It is embedded in the ground so that it faces the surface.

In cold regions and the like, in order to prevent a water meter and a water pipe from bursting due to freezing, a water supply device is buried deep from the ground surface. In this case, one or several joint frame bodies are connected below the receiving frame body to which the lid body is attached, so that the water supply device is housed inside the lowermost joint frame body. The total height is adjusted. Further, when the ground is slightly soft, a bottom frame is installed on the lower surface side of the receiving frame or the joint frame that houses the water supply device to protect the water meter casing from sinking. For this reason, in most cases, the water meter casing is installed by embedding it in the ground with a plurality of frame bodies stacked vertically.

However, if a plurality of frames are simply stacked on top of each other, the stability in the ground will be poor, and the positions of the top and bottom frames will shift during the installation work, and the earth and sand will flow into the interior of the frame. There is a risk of

In order to prevent such displacement of the frame body, it is necessary to connect and integrate a plurality of frame bodies at the time of on-site construction. There is one described in Japanese Patent No. 311940.

The connecting structure of the water meter casing described in this publication is
The upper and lower frame bodies can be connected to each other by the engagement relationship between the engagement portion provided on one frame body and the engagement tool provided on the other frame body, and the posture is changed by the rotation of the engagement tool. The fitting and the engaging portion can be engaged and disengaged.

[0007]

However, in the connecting structure described in the above publication, the lower opening edge of the engaging hole and the engaging hole in the engaging hole as the engaging portion are engaged with each other. Since the lower end surface on the tip side of the engaging tool facing each other is located at the same height, when these are engaged to connect the frame bodies, the force of the frame body and the engagement Since the tool bends and the positions of the engaging hole and the engaging tool are displaced in the vertical direction, there is a problem that the engaging tool is difficult to fit into the engaging hole. In such a case, it is necessary to artificially fit the engagement tool into the engagement hole using a pointed tool such as a screwdriver, and the workability of the connecting work is not good. It was a thing.

[0008] The problem to be solved in the present invention is to provide a connecting structure for a frame body which enables a simple and reliable connecting work.

[0009]

In the frame body connecting structure according to the present invention, upper and lower frame bodies are provided at an engaging hole provided at an abutting portion of one frame body and at an abutting portion of the other frame body. In a connecting structure of a frame body, which can be connected by an engaging relationship with an engaging tool provided, and which can engage and disengage the engaging tool and the engaging hole by changing a posture by rotation of the engaging tool. The engagement tool has an attachment portion for rotatably attaching the engagement tool to the frame body, and a surface having the attachment portion of the engagement tool when the engagement tool is engaged with the engagement hole. It is characterized in that a gap is formed between the front end side end face of and the opening edge of the engaging hole facing the end face.

With such a structure, when the frame bodies are connected to each other, the force deflects the frame body and the engaging tool, and the positions of the engaging hole and the engaging tool are slightly upward and downward. Even if it is displaced, due to the gap between the engagement tool and the engagement hole,
Since the positional deviation is absorbed, the engagement tool is securely fitted into the engagement hole.

Further, the upper and lower frame bodies can be connected to each other by an engagement relationship between an engaging hole provided in an abutting portion of one frame body and an engaging tool provided in an abutting portion of the other frame body. In the connecting structure of the frame body, the engagement tool includes an engagement tool main body and a locking piece that is held by the engagement tool main body so as to be movable back and forth and engages with the engagement hole. The stop piece is characterized in that it is biased toward the protruding side by an elastic body in the engagement tool body.

With this structure, the engaging piece of the engaging tool retracts in the middle of connecting the frame bodies and projects again when the connection is completed. It fits comfortably and securely into.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the engagement tool may be one in which a notch portion is provided on the end surface on the tip side of the surface having the attachment portion. With such a configuration, when the engagement tool is engaged with the engagement hole, a gap is formed between them, so that the engagement tool is securely fitted into the engagement hole.

Further, in a state where the engaging piece is engaged with the engaging hole, the tip end side surface of the engaging piece on the side where the engaging body is attached to the frame and the opening edge of the engaging hole facing the end surface. There can be a gap between and.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view showing a joint frame body for adjusting the height of two upper and lower stages in which the connecting structure of the frame bodies of the present invention is applied to a water meter casing, and FIG. FIG.

In the figure, the lower and upper joint frames 1,
Reference numeral 2 denotes the same frame body made of synthetic resin, which is provided with outer peripheral walls 1a, 2a and inner peripheral walls 1b, 2b, respectively, and several points between these inner and outer peripheral walls are connected by ribs 1i, 2i, and a lower end It has a hollow structure with an open.
The outer peripheral walls 1a and 2a are formed to be slightly longer than the inner peripheral walls 1b and 2b, and engaging holes 1c and 2c are formed at a total of four lower end portions.

An outer peripheral wall 1a is provided at the upper ends of the joint frames 1 and 2,
Flat rims 1d and 2d between the inner peripheral wall 1b and 2b
And four engaging members 3 and 4 are attached to these rims 1d and 2d, respectively.

These engaging members 3 and 4 are the same parts, and a side view of the engaging member 3 provided in the joint frame 1 is shown in FIG.
The configuration will be described by taking (a) and FIG. 3 (b) showing a plan view as an example.

The engaging member 3 is made of a synthetic resin and has inclined surfaces 3b and 3c at both ends in the longitudinal direction. Further, a hook 3d as a mounting portion is formed on the lower surface on a side biased to the inclined surface 3c. It was installed in.

At the lower end surface of the engaging tool 3 on the tip side (on the side of the inclined surface 3b), that is, on the tip side end surface of the surface having the hook 3d, a notch 3f is formed by notching this end surface and protrudes downward. The protrusion 3e is provided.

The hook 3d is provided with two legs 3d-1 having a substantially semicircular cross-sectional shape at intervals, and a taper 3d-2 is formed at the lower end of each leg 3d-1, as shown in FIG. 3 (a). It can be elastically deformed in the direction of the arrow.

As shown in FIGS. 1 and 2, the engagement tool 3 is
The hook 3d is inserted into the mounting hole 1e formed in the rim 1d and mounted on the joint frame 1. The inner diameter of the mounting hole 1e is slightly smaller than the outer diameter of the upper end of the taper 3d-2 of the hook 3d, and has substantially the same size as the outer diameter of the leg 3d-1. The hook 3d can be rotated in the mounting hole 1e. As in the present embodiment, when the knob 3a formed so that an H-shaped ridge is formed at the upper end of the engagement tool 3, the rotation operation becomes easy.

FIG. 4 shows a state in which the engagement tool 3 is held in the same posture as that of the engagement tool 4 attached to the upper joint frame body 2 in FIG. 2, and FIG. ) Is a plan view.

In FIG. 4, in the vicinity of the mounting hole 1e,
A holding groove 1f into which a protruding projection 3e is fitted is provided on the lower surface of the engagement tool 3, and a stopper 1g is formed on the opposite side of the holding groove 1f so as to have a substantially square planar shape. When the projection 3e is fitted, the holding groove 1f restrains the projection 3e to hold the engagement tool 3 in the posture shown in FIG. 4 (b). Further, the stopper 1g utilizes the biased arrangement of the hook 3d with respect to the knob 3a when the engagement tool 3 is rotated around the hook 3d in the mounting hole 1e.
Is rotated clockwise or counterclockwise in FIG. 3B, the protrusion 3e is engaged with the upper edge of the outer peripheral wall 1a when the protrusion 3e is in the holding groove 1f or when the protrusion 3e is connected as described later. It is designed to be fixed stably only when it is fitted.

The same applies to the engaging tool 4 provided on the joint frame body 2 arranged in the upper stage, and it can be rotatably mounted by inserting the hook portion into the mounting hole formed in the rim 2d. Then, the holding groove 2f provided on the rim 2d
By using the stopper 2g and the engaging tool 4 in the holding groove 2f, the engaging tool 4 is held in the postures shown in FIGS. 1 and 2 in the same manner as described with reference to FIG.

With the above construction, when the engaging member 3 is set in the posture shown in FIG. 4, the inclined surface 3b on the tip side of the engaging member 3 is
Since it is positioned so as to fit on the rim 1d and does not protrude outward from the outer peripheral wall 1a, even if the joint frame body 2 is covered, the engagement tool 3
There is no interference with. Therefore, if the engagement tool 3 is set in such a posture, the upper and lower joint frame bodies 1 and 2 are not connected to each other, so that the joint frame bodies 1 and 2 can be easily assembled at the time of shipping or site construction. Can be separated into

FIG. 5 is a longitudinal cross-sectional view of a main portion showing the connection of the upper joining frame body to the lower joining frame body in order by setting the engagement tool in the posture at the time of joining.

The engaging member 3 is rotated from the posture shown in FIG. 4 to the posture in which the inclined surface 3b on the tip side faces the outside of the joint frame 1. At this time, the protrusion 3e is formed on the joint frame 1
If the protrusion 3e has a certain length in the circumferential direction of the outer peripheral wall 1a, the engaging member 3 is brought into surface contact with the outer peripheral wall 1a. Is bound.

The distance between the lower ends of the inclined surfaces 3b and 3c of the engagement tool 3 is determined by the outer peripheral wall 2a of the joint frame body 2 in the upper stage.
When the engaging tool 3 is engaged with the engaging hole 2c with a relationship that is slightly larger than the horizontal distance between the lower end inner side surfaces of the inner peripheral wall 2b, the lower end of the inclined surface 3b is the upper joining frame body 2 It is designed to enter the engaging hole 2c.

FIG. 5 (a) shows a state in which the inner peripheral edge of the lower end of the outer peripheral wall 2a of the joint frame body 2 is lowered until it abuts the inclined surface 3b of the engaging tool 3, and the joint frame body 1 side is further covered. Then, the inclined surface 3b elastically deforms in a direction in which the lower end side of the outer peripheral wall 2a is pushed outward. And the joint frame body 2
The lower inclined surface 3c as shown in FIG. 5 (b).
When the lower end of the inner peripheral wall 2b reaches the lower end side of the inner peripheral wall 2b, the lower end of the inclined surface 3b abuts against the inner surface of the outer peripheral wall 2a and is restrained, so that the inner peripheral wall 2b is pushed inward by the inclined surface 3c and elastically deformed. To do.

As described above, when the joint frame body 2 is covered, the outer peripheral wall 2a is first pushed outward by the inclined surface 3b, and then the inner peripheral wall 2b is inclined by the inclined surface 3c.
Elastically deforms so that is pushed inward.

When the joint frame body 2 is further pushed down,
As shown in FIG. 5C, the lower end of the inclined surface 3b has the engagement hole 2
Fit in c. At this time, in the present embodiment, as described above, the engagement tool 3 is provided with the engagement hole 2 by providing the notch 3f on the end face of the engagement tool 3 on the side having the hook 3d.
When fitted in c, a gap is formed between the end face of the engagement tool 3 and the opening edge of the engagement hole 2c facing the end surface, so that the engagement tool 3 is engaged. Even if the position with respect to the hole 2c is slightly deviated in the vertical direction, the positional deviation is absorbed by the gap, so that the engagement tool 3 fits securely and easily into the engagement hole 2c.

When the engagement tool 3 is fitted into the locking hole 2c, the outer peripheral wall 2a elastically restores to the inner side as is clear from the comparison with FIG. Is rim 2
The inner peripheral wall 2b integrated by d is also displaced inward. Therefore, the inner peripheral wall 2b on the side of the inclined surface 3c is not abutted, and both the outer peripheral wall 2a and the inner peripheral wall 2b are restored to the shape before being connected.

As described above, the joint frames 1 and 2 are connected to each other by fitting the engagement tool 3 into the engagement hole 2c. Even when the joint frames 1 and 2 are to be separated from each other, the engaging tool 3 does not work unless an external force acts to push the inner peripheral wall 2b of the joint frame 2 inward and the outer peripheral wall 2a outward. The engagement by is not released, and a strong and stable connected state is maintained. Further, the ribs 1i and 2i inside the joint frames 1 and 2 have outer walls 1a and 2a and inner walls 1b,
Since they are connected to 2b, these outer peripheral walls 1a,
It is regulated that the space between the inner peripheral wall 2a and the inner peripheral wall 1b, 2b is not widened, so that the connection by the engagement tool 3 is further strengthened.

Further, when the connected joint frames 1 and 2 are separated from each other, as shown in FIG. 5 (c), the inclined surface 3b side of the engaging member 3 is exposed from the engaging hole 2c, so that the fingertips are used. Pushing or rotating the engagement tool 3 by using a pointed tool such as a stick or a screwdriver to return it to the posture of FIG. As a result, the engagement between the engagement tool 3 and the joint frame body 2 is released, and the joint frame bodies 1 and 2 can be separated.

In the illustrated embodiment, the engaging member 3 has two
Although the inclined surfaces 3b and 3c are provided on the surface, instead of this, only the inclined surface 3b may be formed and the other surface may be a vertical surface. Even in this case, since the inclined surface 3b pushes the outer peripheral wall 2a outward by taper engagement and then the inclined surface 3b side fits into the engagement hole 2c, the outer peripheral wall 2a is deformed outward similarly to the previous embodiment. Including the process of making. Therefore,
After the connection, unless the outer peripheral wall 2a is deformed to expand outward, the constraint by the engagement tool 3 is not released, and the stable connection is similarly maintained.

Further, the joint frames 1 and 2 have a cross-sectional shape in which the lower ends of the outer peripheral walls 1a and 2a and the inner peripheral walls 1b and 2b are opened, but instead of this, a cross-sectional shape in which the upper ends are opened. Good. That is, the stacking structure in which the example of FIG. 5 is turned upside down is provided, and an engaging tool is provided on the side of the joint frame in the upper stage, and the engaging tool is inserted into the engaging hole of the joint frame in the lower stage. The upper and lower joint frames can be connected.

Further, the engagement holes 1c, 2c are formed in the outer peripheral walls 1a, 2a, respectively, instead of the inner peripheral walls 1b, 2b.
It may be opened. In this case, the engagement tool 3 may be in a posture rotated by 180 ° from the posture shown in FIG. 5, and the operation of releasing the engagement may be performed from the inside of the joint frames 1 and 2.

6 and 7 show an example in which the connecting structure of the frame body of the present invention is applied between the receiving frame body and the bottom frame body.

In the figure, the bottom frame body 5 has a flat trough shape, and a flange 5a is formed on the upper end of the periphery thereof, and the bottom frame body 5 is attached to four places of the flange 5a as in the example shown in FIG. The hole 5b, the holding groove 5c, and the stopper 5d are provided, and the engagement tool 6 is rotatably inserted into the mounting hole 5b. This engaging tool 6 is similar to that of the previous embodiment in that the knob 6a,
The inclined surfaces 6b and 6c, the hook 6d as a mounting portion, and the protrusion 6e are formed.

In this embodiment, the receiving frame body 7 is the joint frame bodies 1 and 2.
It is directly stacked on the bottom frame body 5 without interposing, and the lid body 7e is attached to the upper end of the bottom frame body 5 so as to be openable and closable, and aligned with the engaging tools 6 attached to the bottom frame body 5 at four places on the lower end side. The engaging hole 7a is opened at the position where As shown in FIG. 7, the lower opening edge of the engagement hole 7a, when engaged with the engagement tool 6, is the lower end surface of the engagement tool 6 on the tip side (the inclined surface 6b side), that is, the hook 6d. It is expanded so as to be located below the end surface on the tip side of the surface having. The receiving frame body 7 has an inner peripheral wall 7b and an outer peripheral wall 7c formed at the lower end thereof, and the engaging hole 7a is formed.
Is opened in the outer peripheral wall 7c. And the engagement hole 7
A skirt 7d is formed so as to slightly project outward from the lower end opening edge of a and extend downward.

The relationship between the distance between the inner peripheral wall 7b and the outer peripheral wall 7c of the receiving frame 7 and the distance between the lower ends of the inclined surfaces 6b and 6c of the engaging tool 6 is the same as that described in FIG. Depending on the rotational posture of the engagement tool 6, the engagement between the receiving frame body 7 and the bottom frame body 5 and the releasing operation thereof can be performed in the same manner.

Also in the receiving frame 7 and the bottom frame 5 as described above, if the engaging tool 6 is set in the posture shown in FIG. 5A, the inclined surface 6b side is engaged, as in the previous embodiment. When entering into the Goana 7a is held simultaneously abuts against the outer surface of the inclined surface 6 c side is the wall 7b, by inner wall 7b and the outer peripheral wall 7c is during this coupling is expanded elastically deformed, engaging member Accept 6 Therefore, after the coupling, the connection between the bottom frame body 5 and the receiving frame body 7 by the engagement tool 6 is maintained unless the inner peripheral wall 7b and the outer peripheral wall 7c are deformed so as to expand.

In this embodiment, the lower opening edge of the engaging hole 7a is formed so as to expand downward, so that when the engaging tool 6 is fitted into the engaging hole 7a, the engaging member 6 is engaged. Since a gap is formed between the tip end side surface of the tool 6 having the hook 6d and the opening edge of the engaging hole 7a facing the end surface, the engaging tool 6 is provided in the same manner as in the previous embodiment. Securely and easily fit into the engagement hole 7a.

In addition to the above embodiments, one or several joint frame bodies are stacked between the receiving frame body 7 and the bottom frame body 5,
These frames can be connected to each other by the same method as in the above-described embodiments.

FIG. 8 shows another embodiment of the present invention, in which the engaging member is set to the posture at the time of connection and the longitudinal section of the main part showing the connection of the upper connection frame to the lower connection frame in order. It is a side view.

The engaging tool 10 is provided with an inclined surface 10b at one end of the engaging tool body 10d, and an engaging piece 10a protruding from the engaging tool body 10d so as to be able to move forward and backward is held at the other end. The locking piece 10a has an inclined surface 10e on the projecting side and is biased to the projecting side by an elastic body 10c in the engagement tool body 10d. A bifurcated hook 11 to be inserted into the attachment hole 8e of the joint frame body 8 is provided on the lower surface of the engagement tool body 10d, similarly to the engagement tool of the above-described embodiment. In the above-described configuration, the engaging tool 10 is attached with the hook 11 inserted in the attaching hole such that the inclined surface 10e on the tip side of the locking piece 10a faces the outside of the joint frame body 8. Figure 8 (a)
Shows a state in which the lower end inner peripheral edge of the outer peripheral wall of the joint frame body 9 arranged in the upper stage is lowered until it abuts the inclined surface 10e of the locking piece 10a, and the joint frame body is further covered by the side of the joint frame body 8 arranged in the lower stage. When 9 is pushed down, as shown in FIG. 8B, the lower end of the outer peripheral wall of the joint frame body 9 pushes the inclined surface 10e,
The locking piece 10a retracts into the engagement tool body 10d.

When the joint frame 9 is further pushed down,
The tip of the locking piece 10a is urged toward the projecting side by the elastic body 10c, and as shown in FIG. 8C, advances into the engaging hole 9a and fits therein.

As described above, the locking piece 10a of the engaging tool 10
Is fitted into the engagement hole 9a, so that the joint frame body 8,
9 are connected to each other. Further, in this embodiment, since the locking piece 10a is attached to the engagement tool body 10d so as to be able to move back and forth, the locking piece 10a fits into the engagement hole 9a reliably and easily.

In the present embodiment as well, as in the previous embodiment, when the locking piece 10a is fitted into the engaging hole 9a, a gap is formed between them, but this embodiment As described above, when the locking piece 10a is configured to be movable back and forth, the locking piece 10a fits securely and easily into the engagement hole 9a even if there is no gap. Further, in the case of the present embodiment, the joint frames 8 and 9 do not need to be elastically deformable.

When the joint frames 8 and 9 are separated from each other, as shown in FIG.
As shown in (c), since the inclined surface 10e side of the locking piece 10a faces the outside from the engagement hole 9a, the engagement tool 10 is pushed by a fingertip or a pointed tool such as a stick or a screwdriver is used. Is rotated to return it to the posture shown in FIG. As a result, the engagement between the engagement tool 10 and the joint frame body 9 is released, and the joint frame bodies 8 and 9 can be separated.

At the time of separation, the engaging piece 10a is not returned to the state shown in FIG. 4 as described above, but the locking piece 10a is retracted into the engaging tool main body 10d in the posture of being connected,
It can also be separated by lifting the joint frame body 9 as it is. Therefore, in the case of the present embodiment, the engagement tool 10 does not necessarily have to be rotatable.

[0053]

According to the present invention, not only can engagement and disengagement with respect to the engaging portion be performed easily and quickly, but also when the frame bodies are to be connected to each other, the force exerts the force on the frame body and the engagement. Even if the tool bends and the positions of the engaging hole and the engaging tool are slightly displaced in the vertical direction, the positional deviation is absorbed by the gap between the engaging tool and the engaging hole, so that the engaging tool can be reliably operated. Fit into the engagement hole. Therefore, the connection of the frame bodies becomes simple and reliable, and the workability is improved. Further, in the case where the engagement piece of the engagement tool is held in the engagement tool main body so as to be able to advance and retreat, the engagement piece of the engagement tool retracts and the connection is made while the frames are being connected. It will project again when completed, so
The engaging tool fits in the engaging hole without difficulty. Therefore, also in this case, the connection of the frame bodies becomes simple and reliable, and the workability is improved.

[Brief description of drawings]

FIG. 1 is a top and bottom 2 to which a connecting structure of a water meter casing of the present invention is applied.
It is an exploded perspective view showing the connection by the engagement tool of the step joint frame body.

FIG. 2 is a perspective view showing an enlarged main part of FIG.

3A and 3B show an engagement tool, FIG. 3A is a front view thereof, and FIG. 3B is a plan view thereof.

4A and 4B show a state in which an engagement tool is attached to an upper joint frame body, FIG. 4A is a longitudinal sectional view thereof, and FIG. 4B is a plan view.

FIG. 5 is a longitudinal cross-sectional view of a main part showing the connection of the upper joining frame body to the lower joining frame body in order by setting the engagement tool in the posture of the coupling side.

FIG. 6 is a perspective view showing a connecting structure between a receiving frame body and a bottom frame body.

FIG. 7 is a vertical cross-sectional view showing a connecting structure between a receiving frame body and a bottom frame body.

[8] A further embodiment of the present invention, longitudinal sectional view of a main part showing a connection of the upper joint frame of set the connection side of the posture engaging member to the lower splicing frame body in order Is.

[Explanation of symbols]

1 joint frame body (frame body) 1a outer peripheral wall 1b inner peripheral wall 1c engagement hole 1d rim 1e mounting hole 1 g stopper 2 joint frame body (frame body) 2a outer peripheral wall 2b inner peripheral wall 2c engagement hole 2d rim 3 engagement tool 3a knob 3b inclined surface 3c inclined surface 3d hook (mounting portion) 3e protrusion 3f notch 4 engaging tool 5 bottom frame (frame) 6 engaging tool 6b inclined surface 6c inclined surface 6d hook (mounting portion) 7 receiving frame Body (frame body) 7a Engagement hole 7b Inner peripheral wall 7c Outer peripheral wall 7d Skirt 7e Lid body 8 Joint frame body (frame body) 9 Joint frame body (frame body) 9a Engagement hole 10 Engagement tool 10a Engagement piece 10b Inclined Surface 10c Elastic body 10d Engagement tool body 10e Inclined surface 11 Hook (mounting part)

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Claims (4)

(57) [Claims] 1. The upper and lower frame bodies can be connected by an engagement relationship between an engagement hole provided in an abutting portion of one frame body and an engagement tool provided in an abutting portion of the other frame body. In the frame connecting structure in which the engagement tool and the engagement hole can be engaged with and disengaged from each other by changing the posture of the engagement tool by rotation, In the state in which the engaging member has a mounting portion for rotatably mounting, and the engaging tool is engaged with the engaging hole, the tip end side end surface of the surface having the mounting portion of the engaging tool and the opening of the engaging hole facing the end surface. A frame connecting structure characterized in that a gap is formed between the frame and the edge. 2. The frame connecting structure according to claim 1, wherein the engaging member is provided with a notch on the end face on the tip side of the surface having the mounting portion. 3. The upper and lower frame bodies can be connected by an engagement relationship between an engagement hole provided in an abutting portion of one frame body and an engagement tool provided in an abutting portion of the other frame body. In the connection structure of the frame body, the engaging member is an engaging member main body,
The engaging piece main body comprises a locking piece that is held in the engaging tool body so as to be able to move forward and backward, and is engageable with the engaging hole. The locking piece is biased toward the projecting side by an elastic body in the engaging tool body. A frame connecting structure characterized by the above. 4. The tip end side end surface of the engaging piece on the side where the engaging body is attached to the frame and the opening edge of the engaging hole facing the engaging piece body in a state where the engaging piece is engaged with the engaging hole. The frame connecting structure according to claim 3, wherein a gap is formed between the frame and the frame.