JPH0225339Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention This invention relates to an improvement of a spring structure for a folding bed.

The conventional spring structure has an inconvenience in that it can only be bent along the helical line at a certain point connecting the hourglass-shaped springs, and cannot be bent along the helical line at any other point. Therefore, the first object of the present invention is to improve this point and provide a bendable spring structure that can accommodate bending of any part of the bed frame. However, even if the above objective is achieved, it will be difficult to put it into general use if the manufacturing cost increases. Therefore, the second object of the present invention is to manufacture the spring structure at low cost and to provide it for general use.

(2) Structure of the device The spring structure consists of a suitable number of hourglass-shaped springs that are arranged in contact with each other in the longitudinal direction, several rows of these springs are arranged in parallel at regular intervals, and the springs are brought into contact with each other by horizontal helical lines. At the same time as connecting the parts, a process of connecting each spring row is performed. At this stage, the spring arrangement can be bent at any point along the helical line. However, since the spring structure is made by surrounding the upper and lower surfaces of the spring array with steel wire frames and clipping these contact areas, this spring structure can be bent to some extent. cannot bend this. If this is forcibly bent, the frame line of the steel wire will be bent, but even if the refractive power is removed, the frame line will remain bent and will not return to its original shape. Therefore, in the spring structures for folding beds to date, ingenuity has been put into the part of the frame line on the side, for example, by cutting the part of the frame line where you want to bend and connecting that part with a ring, the bending can be done. It was made to be possible. The bending line of such a spring structure is defined by a specific helical line and is usually made in one place. However, creating bending lines at multiple locations has the disadvantage of complicating the configuration and increasing manufacturing costs. Therefore, the inventor abandoned the fixed idea that the frame line was made of steel wire and searched for materials other than steel wire with a high refractive index and high restoring force. We have discovered that it is suitable for this condition.

The spring structure of the present invention uses a plastic frame line in the bent portion, and uses a conventional steel wire frame line in the unnecessary portion.

An example of this proposal will be explained with reference to the drawings. The plastic frame line 4 is in the form of a double strip and has a space 7 whose cross section is U-shaped. Since the steel frame line 3 has a diameter of 3.8 mm, in order to connect it to the plastic frame line 4, the bottom part of the U-shaped space 7 of the plastic frame line 4 is made into a circular shape with a diameter of 3.8 mm and a thickness of 2.35 mm. mm, and since the diameter of the steel wire of spring 1 is 2.3 mm, the U of plastic frame line 4
The width of the character-shaped space 7 is 2.5 mm and the thickness is 3.0 mm, and the width of the plastic frame line 4 is 10 mm. The plastic frame line 4 has the center of the bent part 6 every 90 mm, and the thickness of the double band part between the 20 mm is 1 mm.
Make it thinner and make it 2mm. The plastic border line is made with a length of 1275-1285mm. In order to connect the steel wire frame line 3 and the plastic frame line 4, the end of the frame line 3 is inserted into the bottom of the U-shaped space 7 at the end of the plastic frame line 4, and both frame lines 3 and 4 are connected with a spring. Fasten with clip 5 along the circumference of the array. When attaching the plastic frame line 4 to the spring array, the center of the bent portion 6 is placed on the extension line of the helical line 2 of the spring structure, and the circular ring portion of the hourglass-shaped spring 1 around the spring array is aligned. It is inserted into the U-shaped space 7 of the frame line 4 and fixed with the clip 5. Therefore, no matter which part of the bed frame is bent, the structure of the present invention will be bent at that part, and when the bed frame returns to its flat state, it will return to its flat state accordingly.

(3) Effects of the invention As mentioned above, the spring structure employing a plastic frame line can be bent at any part of the bed frame, and the time and effort required to attach the plastic frame line to the spring array can be reduced compared to conventional steel wires. Since it is not much different from that of the frame line, there is a profit that the production cost does not rise too much. Therefore, the present invention can provide a new and useful bendable bed spring structure.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a part of the bed spring structure of the present invention, Fig. 2 is a perspective view of the spring structure of Fig. 1 bent at two points, and Fig. 3 is a perspective view of the plastic frame of the present invention. The front view, Figure 4 is a plan view of the same, Figure 5 is a rear view of the same, Figure 6 is a side sectional view taken along the AA line of Figure 3, and Figure 7 is a side view of Figure 5 taken along the BB line. 8 is a plan view of a part of the bed spring structure showing the connection between the spring arrangement and the plastic frame line, and FIG. 9 is an elevational view of FIG. 8. . 1... drum-shaped spring, 2... helical wire, 3... steel wire frame line, 4... plastic frame line, 5... clip,
6... Refraction part, 7... Space part.

Claims (1)

[Scope of utility model registration request] Arrange a suitable number of drum-shaped springs in contact with each other, arrange several rows of springs in parallel at regular intervals, and screw the contact parts of the upper and lower circular rings of each spring with horizontal helical wires. The spring arrays are connected, and the steel wire frames on the outer periphery of the upper and lower surfaces of the spring arrays are partially or completely replaced with plastic frames, and the plastic frames have double overlapping cross sections. The steel wire is shaped like a strip or a round bar with a U-shaped space, and has a constant length in the longitudinal direction corresponding to the spacing between the helical wires. Insert the plastic frame line into the bottom of the U-shaped space, arrange the plastic frame line so that its bent part is on the extension line of the helical line, and insert the upper and lower circular ring parts of each spring outside the spring array into the plastic frame line. A bendable spring structure for a bed, which is formed by fitting into the U-shaped space of the frame line and clipping a steel wire frame line and a plastic frame line to the spring arrangement.