JPH0445573Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a back plate holder for a picture frame that is attached by providing a hole in the back plate.

[Prior art]

Picture frame back plate holders are indispensable for general picture frames, so there are various types of back plate holders, including the so-called dragonfly, which is rotatably riveted to the back side of the frame frame. being developed. Among them, the back plate latching tool is installed by making a hole in the back plate, and by attaching a knob to the latching claw and operating the knob within the hole in the back plate, the latching claw on the bottom of the back plate can be attached. Although it is designed to be able to be hung on and removed from the frame frame (publication of Utility Model Publication No. 50-6952), a guide frame that holds the latch claw is used to prevent the latch claw from falling off or the tip of the claw to change direction. Since the guide frame was equipped with a large number of parts, it was also necessary to fix the guide frame to the back plate by some means, for example, by partially crimping, which of course required a lot of man-hours for the fixing method. The problem was that it could break down if the fixings loosened or came off.

In addition, if there is no guide frame for the hook, the hook will fall off or the tip of the hook will change direction (vibrate), making it extremely unstable and inconvenient in practice (for example, Japanese Utility Model Publication No. 58-35101).

In addition, when a screw was used for the knob, a long hole was provided in the bottom wall of the screw so that the tip of the screw screwed into the latch claw did not support the guide frame, so that it could be removed under the back plate. The tip of the screw that has come out of the long hole could come into contact with the mat and damage it, or the contact could make it impossible to insert or remove the latch claw. A space was provided between the frame and the frame to prevent the screw from reaching the mat, but this space was larger than the sum of the thickness of the latch claw and the bottom wall of the holding frame. There was a problem in that it was a constraint to make it thinner (for example, Publication of Utility Model Publication No. 58-35101).

[Purpose of invention]

This invention solves the drawbacks of the conventional back plate latching tool used by providing a hole in the back plate as described above, and there is no need for a guide frame for the latching claw.
Another object of the present invention is to provide a back plate hook that does not require a large space between the back plate and the mat even if screws are used for the knob.

[Structure of the idea]

In other words, the structure of this invention to achieve the above purpose is that a guide groove for the knob is provided in the center, a knob saucer that is fixedly fitted into a hole drilled in the back plate, and a toe that hangs on the frame frame. A picture frame back plate latching device is a thin plate that can be inserted and removed from the edge of the back plate by operating a knob, and has a latch claw that touches the back of the back plate. The hook is formed at a height that allows it to fit halfway, and the latch claw is provided with a convex portion that protrudes into the extraction hole opposite to the saucer and corresponds to the remaining depth of the aforementioned extraction hole, and this convex portion extends forward and backward in the extraction hole. Formed in a shape that is movable and non-rotatably fitted in the width direction of the extraction hole, and the knob is a screw, and the threaded part of the knob is screwed into the center of the convex part of the latch claw. The gist thereof is that a screw hole protrusion is provided protrudingly on the side of the recess within the depth range of the recess formed by the projection and the screw hole.

〔Example〕

The drawing shows one embodiment, and the back board latching tool consists of a saucer 1 for a knob 3 and a latching claw 2 operated by the knob 3 (Fig. 1), and a guide for the latching claw 2. The frame is missing. The saucer 1 and the latch claw 2 are
It is made by pressing a thin sheet of metal, but it can also be made of plastic.

The saucer 1 is formed in a size that tightly fits into the hole 6 of the thin plate 5 so as not to move, and a flange 7 that hangs over the upper surface of the thin plate 5 is provided on the periphery. Further, the height of the saucer 1 is formed to a dimension that reaches about half the depth of the extraction hole 6, and the bottom wall 8 has a hook 2 in the front and back direction, that is, a hook 2.
A long knob guide groove 9 is provided in the direction of insertion and removal.

The latching claw 2 has a plate shape with a longitudinal length wider than the extraction hole 6, and is provided with a convex portion 10 that fits into the extraction hole 6 at the center. However, the convex portion 10 does not fit into the hole 6 all the way around, but only in its width, so it can move back and forth in the hole 6. Convex part 1
0 has a screw hole 11 in the center, but the bottom surface has a concave part 12 by molding the convex part 10.
A screw hole protrusion 14 is provided in the recess 12 to protrude within the depth of the recess 12, that is, to the extent that it does not reach the lower surface 13 (Fig. 3), so that the screw can be stably inserted. It is set as.

The knob 3 uses a screw that can be screwed into the screw hole 11 of the latch claw 2, and the threaded portion 3a is formed short so that its tip does not reach the position of the lower surface 13 of the latch claw 2.

When using the above-mentioned back plate hanging tool, the back plate 5
Fit the saucer 1 and the convex portion 10 of the latch claw 2 into the extraction hole 6 so as to face each other, and then screw the threaded portion 3a of the knob 3 into the screw hole 11 of the latch claw 2 through the guide groove 9 of the saucer 1. (Figures 2 and 3). When this is done, the upper saucer 1 and the lower latching claw 2 are connected through the extraction hole 6, and
A hole 6 is removed from the back plate 5 using the flange 7 of the saucer 1 and the hook 2.
Since it is clamped around the entire circumference, the back plate hook will never come off unless the knob 3 is removed.

In this state, the protrusion 10 of the hook 2 has enough room to move forward and backward in the hole 6, so when the screw of the knob 3 is loosened, the hook 2 can be moved in and out of the end of the back plate 5 by operating the knob 3. However, the protrusion 10 of the hook 2 is in the hole 6.
Since the hook 2 fits into the hole 6 in the width direction and is prevented from rotating by the engagement therewith, the direction of the hook tip 2a cannot be changed by merely loosening the screw of the knob 3 slightly, and the hook 2 moves parallel to the longitudinal direction of the hole 6.

When attaching the back plate 5 to the picture frame G, the toe 2a of the latch claw 2 is retracted (Fig. 2), and the back plate 5 is dropped onto the mat 18 (Fig. 4).
Push the knob 3 to hook the toe 2a on the hook 20 of the frame frame F, but since such parallel movement of the hook 2 is ensured, the tip of the toe 2a can be hooked by simply pushing the knob 3. Can be hooked. Also,
After hooking the toe 2a, the screw of the knob 3 is loosened, but even at this time, the latch claw 2 does not rotate along with the knob 3. Further, since the hooking claw 2 is fixed to the saucer 1 by tightening the screw, the hooking state of the toe 2a to the frame F is maintained.

Since the tip of the threaded portion 3a of the knob 3 does not fall below the position of the lower surface 13 of the latch claw 2, the lower surface of the latch claw 2 is joined to the mat 18. Further, since the tip of the threaded portion 3a does not come into contact with the mat 18, it is possible to prevent the mat 18 from being scratched by the threaded portion 3a. Furthermore, the threaded portion 3a does not interfere with the movement of the latch claw 2.

Since the latching claw 2 is joined to both surfaces of the mat 18 and the back plate 5, a space 19 corresponding to the thickness of the latching claw 2 is created between the two surfaces. Since the thickness of the latch claw 2 is small, the space 19 is also small, and by making the thickness of the latch claw 2 as thin as possible in terms of strength, the space 19 can be further reduced. Therefore, it is desirable that the hooking pawl 2 be made wide and thin.

[Effect of idea]

As explained above, the back plate latching tool of this invention does not have a guide frame for the latching claw, and has a simple structure, so it can be provided at a low cost. Despite this, the tip of the latch claw does not change direction and maintains a stable latching state with the frame rib, making it easy to insert and remove it, and also to reduce the space between the mat and the back plate. This has the excellent effect of being able to minimize this by simply reducing the thickness of the hook.

In addition, when screws such as screws are used for the knob, even if the length of the threaded part is made so that the tip does not reach the mat, the screw hole is provided in the convex part of the latch claw, and the convex part The protruding edge of the screw hole protrudes from the bottom of the screw hole, which ensures the strength and stability of the threaded part, and even if the screw is used for the knob, it will not interfere between the mat and the back plate. An extremely practical effect can be obtained in that it does not interfere with the miniaturization of the space.

[Brief explanation of the drawing]

The drawings show one embodiment; Fig. 1 is an exploded perspective view showing the relationship with the back plate, Fig. 2 is a perspective view showing the state attached to the back plate, and Fig. 3 is a view taken along the line A-A in Fig. 2. FIG. 4 is a partial sectional view of the picture frame showing how the back plate is attached. 1... saucer, 2... latching claw, 3... knob, 5...
... Back plate, 6 ... Hole, 9 ... Guide groove, 10 ... Convex part, 11 ... Screw hole.

Claims (1)

[Scope of utility model registration request] A back plate fastener for a picture frame is provided with a guide groove for the knob in the center and is fixedly fitted into a hole drilled in the back plate, and the tip of the knob for hanging on the frame is a thin plate-like hook that is in contact with the back plate's underside and is moved in and out of the edge of the back plate by the operation of the knob.
a receiving tray formed to a height that fits partway into a hole in the back plate, a hook having a protrusion that faces the receiving tray and fits into the hole together with the receiving tray, the protrusion being the remaining depth of the hole, and the protrusion is formed in a shape that allows it to move back and forth in the hole and fits in the width direction of the hole so as not to rotate, the knob is a screw, and a screw hole protrusion is provided in the center of the protrusion of the hook, together with a screw hole into which the screw portion of the knob screws into, and a screw hole protrusion is provided on the recess side within the depth range of the recess formed by the protrusion.