JPH0522528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for connecting vertical and horizontal frame frames in assembling a picture frame made of light metal such as aluminum.

[Prior art]

Regarding the method of connecting the vertical and horizontal frame bones in this type of picture frame, a dovetail groove with a narrow width opening is provided in the frame bone, and the connecting fitting is an L-shaped connecting plate consisting of both insertion pieces that are inserted into the dovetail grooves of the vertical and horizontal frame bones. However, there are various means for fixing the connecting plate to the frame bone. For example, there are those that drive the insertion piece into the dovetail groove like a wedge, those that have claws on both sides of the insertion piece that bite into the inner wall of the dovetail groove, and those that use screws. However, in most cases other than when using screws, it is necessary to strike a part of the connecting plate, and the impact may damage the frame bone.
Connections are likely to become loose, misaligned, or distorted. Also,
When using screws, it takes time to screw them in, making the frame assembly process inefficient.

In order to solve these drawbacks, we decided to use the principle of leverage to create a connection that can be fixed with an extremely simple one-touch operation, without the need for any operations that apply impact such as hitting. A method has been proposed and put into practical use.

[Problem that the invention seeks to solve]

However, due to the complicated shape of the lever, it is made of hard cast metal such as iron for convenience of molding, whereas the frame frame is made of soft light metal such as aluminum, so when connecting the frame frame, Due to the difference in hardness, the eccentric cam digs deeply into the side surface of the dovetail groove of the frame bone before the lever completes its lodging, and this resistance makes it extremely difficult to lodge the lever. In the case of a lever with an eccentric shaft protruding from both sides (such as the one devised in Utility Model Application No. 61-47857), if the lever was forcibly laid down, the eccentric shaft part would break and be damaged. .

In addition, since the eccentric cam scrapes the inner and lateral surface of the dovetail groove as it advances, the fixing force of the connecting plate by the eccentric cam becomes insufficient after just one or two uses.
Another disadvantage was that the repeated assembly and disassembly of the picture frame further exacerbated the lack of fixing force (such as the above-mentioned Utility Model Applications No. 61-47857 and No. 61-47858).

In view of the above-mentioned circumstances, the eccentric cam does not dig deeply into the inner and lateral surfaces of the dovetail groove when connecting the vertical and horizontal frame bones, so the lever can be easily lowered without strain, and the eccentric cam It is an object of the present invention to provide a method for connecting vertical and horizontal frame bones that does not lack the fixing force of an eccentric cam because there is no need to scrape off the inner and horizontal surfaces.

[Means for solving problems]

To achieve the above object, an object of the present invention is to connect vertical and horizontal frame bones in which dovetail grooves are formed, and to provide an L-shaped connecting plate consisting of both insertion pieces so that it can be inserted into both the dovetail grooves of the vertical and horizontal frame bones. and a lever having an eccentric cam which is in pressure contact with both the dovetail inner lateral surface of the frame bone and the connecting plate, and a tapered claw portion is formed at either the upper or lower end of the eccentric cam, and A part of the eccentric cam on the opposite side of the claw part is formed with a curved surface in the direction of rotation of the lever so that it can be slidably pressed against the insertion piece of the connecting plate using the toe of the claw part as a fulcrum. After inserting the insertion piece of the connecting plate and the eccentric cam of the lever, the lever is laid down so that its claws are pressed into contact with the inner and lateral surfaces of the dovetail groove with their toes, and then the lever is laid down. Then, the stopped toe serves as a fulcrum, and the curved surface of the eccentric cam is slid and pressed against the insertion piece of the connecting plate, and the curved surface of the eccentric cam is released by the sliding movement of the curved surface of the eccentric cam that is applied to the lever. do.

[Effect]

According to the above method, when the lever is lowered,
The tip of the claw of the eccentric cam comes into pressure contact with the inner and lateral surface of the dovetail groove of the frame bone and stops, while the curved surface opposite to the claw slides along the surface of the insertion piece of the connecting plate, making it easy to lower the lever. This can be done easily, and the biting of the toe is so slight that surface deformation can be ignored, and the surface is not scraped by the toe, so a strong fixing force of the eccentric cam can be obtained.

〔Example〕

1 to 7 show one embodiment.

The vertical frame bones F and horizontal frame bones F of the picture frame each have dovetail grooves 4 that open on the back side of the picture frame, and the vertical and horizontal frame bones F,
To connect F, a connecting plate 1, a lever 2, and a regulating plate 3 are used.
A connecting metal P consisting of is used.

The connecting plate 1 is made up of both insertion pieces 5a and 5b so that it can be inserted into both the dovetail grooves 4 of the vertical and horizontal frame bones F, F.
One of the insertion pieces 5a of the character-shaped plate is provided with a slot 6 through which the lever 2 can be folded down, and the slot 6 is opened at the tip of the insertion piece 5a. Moreover, two screw holes 7, 7 are provided in the other insertion piece 5a.

The lever 2 has an eccentric cam 10 at the base end of the handle 9, a knob 11 at the tip, and a protrusion 12 in the middle (second
figure). The eccentric cam 10 consists of a cam body 13 and circular eccentric shaft parts 14, 14 protruding from both sides thereof. It protrudes to the side, becomes thinner toward the tip of the protrusion, and has a claw portion 15 at the tip. The handle 9 has a narrow part 9a on the lodging side that fits into the slot 6.
, and the protrusion 12 is formed in the narrow portion 9a so as to protrude in advance of the slot 6. Also, pick 1
1 is formed so as to face inside the picture frame.

Regarding the formation of the slot 6 in the connecting plate 1, since the lever 1 has a protrusion 12, it is not possible to insert it into the slot 6 from above, so the slot 6 is opened at the tip of the insertion piece 5a. and insert lever 1 through the opening. If the lever 1 has a shape that can be inserted from above, the slot 6
It is also possible to have a closed shape like a window. Regulation plate 3
are both tongue pieces 1 inserted into the dovetail grooves 4, 4 of the frame bones F, F.
L consisting of 8a and 18b and approximately the same as connecting plate 1
It is a letter-shaped plate (Fig. 1), and one tongue piece 18a has a window hole 19 through which the claw part 15 of the eccentric cam 13 of the lever 1 passes.
A stopper 20 is provided on the tip side of the window hole 19, and the stopper 20 is formed by partially pulling out the tongue piece 18a.

When connecting the vertical and horizontal frame frames F, F with the above-mentioned connecting fittings P, first, the screw holes 7, 7 of the connecting plate 1 are connected.
Screw in the screws 8 and 8 respectively, align the regulating plate 3 under the connecting plate 1, and insert the insertion piece 5b on the side into which the screws 8 and 8 are screwed into the dovetail groove 4 of one frame frame F together with the tongue piece 18b. , and then screw the screws 8, 8 deeper into the correct insertion position. Then, the screws 8, 8 press the lower tongue piece 18b against the inner lateral surface of the bottom of the dovetail groove 4, and as a reaction, the insertion piece 5b comes into pressure contact with the protruding pieces 4a, 4a on both sides of the opening of the dovetail groove 4. As shown in FIG. 5, the insertion piece 5b and the tongue piece 18b are fixed to the frame bone F, and the distance between the other insertion piece 5a and the tongue piece 18a is maintained constant.

After attaching the connecting plate 1 and the regulating plate 3 to one of the frame bones F in this way, insert the lever 2 from the opening side of the tip into the slot 6 of the other insertion piece 5a protruding from the end thereof, and then The eccentric cam 13 is dropped into the window hole 19 over the stopper 20 while elastically deforming the cam 18a.

When the eccentric cam 13 is dropped into the window hole 19, the movement range of the eccentric cam 13 is restricted by the window hole 19, and the lever 2 is used to prevent the eccentric shaft parts 14, 14 from falling on the edge of the window hole 19. Since a stable attachment state is obtained, in this state, the insertion piece 5a and the tongue piece 18
a can be inserted into the dovetail groove 4 of the other frame bone F with the lever 2 attached.

Next, the lever 2 is lowered while accurately aligning the cut end surfaces of both frame bones F, F. Then, the fourth
6 and 7, the claw portion 15 of the eccentric cam 10 presses the dovetail groove 4 against the bottom inner lateral surface 4b, and as a reaction, the curved surface 14 of the eccentric shaft portions 14, 14
a, 14a come into pressure contact with the lower surface 5c of the insertion piece 5a, and the insertion piece 5a is pressed against the width opening side projecting pieces 4a, 4a of the dovetail groove 4, so that the insertion piece 5a is fixed to the frame bone F.

At this time, the eccentric cam 10 is in pressure contact with the bottom inner lateral surface 4b of the dovetail groove 4 with the claw portion 15, and with the lower surface of the insertion piece 5a with the curved surfaces 14a, 14a of the eccentric shaft portions 14, 14, respectively. Since the force applied to the eccentric cam 10 as the lever 2 is lowered is lowered by the force applied to the curved surfaces 14a and 14, the force applied to the eccentric cam 10 is
4a escapes by sliding against the insertion piece 5a, the claw portion 15 does not dig deeply into the bottom lateral surface 4b of the dovetail groove 4, or scrape off the bottom lateral surface 4b to advance. After stopping, the curved surfaces 14a, 14a slide using the stopped toe as a fulcrum.

The claw portion 15 hardly bites into the bottom inner lateral surface 4b of the dovetail groove 4, and even if it does bite, it bites right under the pressure contact point, so the fixing force of the eccentric cam is not lacking, and the fixing force is strong even when assembling the next picture frame. can be obtained.

In addition, in this embodiment, the eccentric cam 10 is prevented from being pressed against both the inner lateral surface 4b of the dovetail groove bottom and the lower surface 5c of the insertion piece until the lever 2 is on the verge of completely collapsing (as shown in FIG. 6). Therefore, in this respect as well, the claw portion 15 of the eccentric cam 10 does not bite into the dovetail groove bottom surface 4b, and the lever 2 can be lowered smoothly without resistance.

In order to prevent the lever 2 from being lifted inadvertently, the narrow part 9a of the handle 9 is tightly inserted into the slot 6 of the insertion piece 5a so that it is difficult to come out, and to facilitate the insertion. In addition, the protrusion 12 is arranged to enter the slot 6 in advance.

Further, as described above, since the movement range of the lever 2 is limited by the regulating plate 3, the narrow width portion 9a is reliably fitted into the slot 6 without coming off.

[Other Examples]

In FIG. 8, a slot 6 is provided in one of the insertion pieces 5a of the connecting plate 1. Since the lever 2 is shaped so that it can be passed through from below the slot 6, the slot 6 is placed in the window hole. It is formed in a closed shape. Incidentally, the lever 2 is not provided with the protrusion 12 as in the previous embodiment.

FIG. 9 shows still another embodiment,
In this case, slots 6, 6 for passing the levers 2, 2 are provided in both insertion pieces 5a, 5b of the connecting plate 1, and window holes 19, 19 are similarly provided in both tongue pieces 18a, 18b of the regulating plate 3. It is something. Further, stoppers 20a, 20a which also serve as springs are provided at both ends of the window hole 19.
The regulating plate 3 is fixed to the bottom inner lateral surface by the reaction force of the stoppers 20a, 20a pressing the connecting plate 1 against the upper inner lateral surface of the dovetail groove 4.

〔Effect of the invention〕

As explained above, according to the present invention, by lowering the lever, the claw portion is brought into pressure contact with the inner and lateral surface of the dovetail groove with the tip of the claw, and the lever is further lowered using the stopped tip as a fulcrum. However, as the lever is lowered, the curved surface of the eccentric cam is pressed against the insertion piece while sliding, and the force applied to the lever is released by sliding on the curved surface of the eccentric cam. It occurs only at the fulcrum, so the lever is smooth and easy to operate, there is no risk of the lever being damaged, and the toes do not scrape the inner and lateral surfaces of the dovetail groove, so the lever has sufficient fixing force. Even when the picture frame is assembled and disassembled repeatedly, that is, the lever is repeatedly operated, the connecting ability of the vertical and horizontal frame bones can be strongly maintained, which is a very remarkable effect.

[Brief explanation of drawings]

Figures 1 to 7 show one embodiment; Figure 1 is an exploded perspective view of main parts showing the connected state of the vertical and horizontal frame bones of the picture frame, Figure 2 is a perspective view of the lever, and Figure 3 is the vertical and horizontal frame bones. 4 and 5 are cross-sectional views taken along line A-A and line B-B in FIG. 3,
FIGS. 6 and 7 are enlarged sectional views showing the procedure for operating the lever. FIGS. 8 and 9 are perspective views showing other examples of the connecting fittings, respectively. P...Connection fittings, F...Frame bones, 1...Connection plates,
2... Lever, 4... Dovetail, 4b... Inner lateral surface, 5
a, 5b...Insertion piece, 6...Slot hole, 10...Eccentric cam, 13...Cam body, 14...Eccentric shaft portion, 1
4a...Curved surface.

Claims (1)

[Claims] 1. For the connection of the vertical and horizontal frame bones each having a dovetail groove, an L-shaped connecting plate consisting of both insertion pieces so that it can be inserted into both the dovetail grooves of the vertical and horizontal frame bones, and a connecting plate with the horizontal surface of the frame bone in the dovetail groove. and a lever having an eccentric cam that is in pressure contact with both of the lever, and a lever having a tapered claw at either the upper or lower end of the eccentric cam, and a part of the eccentric cam on the opposite side of the claw. A curved surface relative to the rotational direction of the lever is formed so that it can be slidably pressed against the insertion piece of the connecting plate using the toe of the pawl as a fulcrum, and the insertion piece of the connecting plate and the eccentric cam of the screw are fitted into the dovetail groove of the frame bone. After inserting the lever, the lever is laid down so that its claw is pressed against the inner lateral surface of the dovetail groove with its tip and stopped. When the lever is laid down further, the stopped tip becomes a fulcrum and the curved surface of the eccentric cam is A method for connecting the vertical and horizontal frame bones of a picture frame, characterized in that the cam is pressed against the insertion piece of the connecting plate while sliding, and the force applied to the lever is released by the sliding movement of the curved surface of the eccentric cam.