JPH057953Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a spring provided to provide cushioning properties to a seat.

[Prior Art] A conventional sheet will be explained using FIG. 4. In the figure, 1 is a seat frame, which is made of an angle member having an L-shaped cross section and welded into a rectangular shape. Reference numeral 2 denotes a plurality of side springs bridged in parallel to the seat frame 1, and the side springs 2 are made by bending a wire material such as a piano wire into a wave shape, and are attached to the seat frame 1 by welding or the like. installed. A seat cushion 3 made of a cushion material is placed on the seat frame 1 to form a seat 4.

In the above configuration, the cushion of the seat 4 is
This is achieved by the side spring 2 bending downward and the cushion material of the seat cushion 3 being elastically deformed.

[Problems to be solved by the invention] Since the conventional seat is constructed as described above, it is difficult to manufacture it by bending the side springs 2 made of hard steel, and the side springs 2 are made of hard steel. The load conditions of the spring and the side springs bridged at the ends are different, making it impossible to obtain a good cushion. Furthermore, when changing the stiffness of the seat by changing the tension of the side springs according to the user's preference, there are problems such as the structure for changing the tension becomes complicated, requires a large number of parts, and becomes expensive. It was hot.

This idea was made in order to solve the above problems, and it was possible to obtain a sheet that was easy to manufacture, had good cushioning due to uniform load distribution, and had a simple structure with variable hardness. The purpose is to

[Means for Solving the Problems] The seat according to this invention includes a base leaf spring that is bridged between seat frames and whose center side is deformed downward, and an auxiliary leaf that is superimposed on the lower part of the base leaf spring. The leaf spring includes a spring, a screw portion that rotates to adjust the distance between the leaf springs, and an operating portion that rotates the screw portion via a connecting member.

[Function] The seat in this invention receives the load on the surface by a base leaf spring and an auxiliary leaf spring superimposed on the lower part of the base leaf spring, and the leaf is Change the strength (spring constant) of the leaf spring by changing the spacing between the springs.

[Example] An example of this invention will be described below with reference to FIGS. 1 to 3. Components that are the same as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. In the figure,
5 is a base leaf spring bridged between the seat frames 1; 6 is a holding leaf spring made of a rectangular flat plate stacked on the lower part of the base leaf spring 5 and curved upward toward the end;
The base leaf spring 5 and the auxiliary leaf spring 6 are molded from resin such as RTP or FRP by inorganic filling. 7 is a threaded part;
It consists of a bolt 7a inserted into holes 5a and 6a provided in the center of the base leaf spring 5 and the auxiliary leaf spring 6, and a gear part 7b that rotates the bolt 7a. 8 is a flexible wire which is a connecting member, and this flexible wire 8 passes through an outer tube 8a connected between the gear part 7b and the seat frame 1 and protrudes from the side surface of the seat frame 1 and the seat cushion 3, A knob 9, which is an operating section, is provided at the tip.

In the above configuration, when the knob 9 is turned, the bolt 7a is rotated via the flexible wire 8 and the gear portion 7b. When the bolt 7a is rotated, it expands and contracts in the vertical direction from the gear portion 7b, and the auxiliary leaf spring 6 follows the length of the bolt 7a's expansion and contraction due to its own elastic force. The distance from the leaf spring 6 changes. That is, as shown in FIG. 2, when the bolt 7a is screwed into the gear part 7b and the base and the auxiliary leaf springs 5 and 6 are in contact with each other, when the bolt 7a is rotated by turning the knob 9, the bolt 7a is rotated. As shown in FIG. 3, the bolt 7a extends from the gear portion 7b, and the distance between the base and the auxiliary leaf springs 5, 6 increases. By increasing the distance between the base and auxiliary leaf springs 5 and 6, the spring constant of the leaf springs becomes smaller, and the hardness of the entire seat 4 becomes softer. Conversely, when the state shown in FIG. 3 changes to the state shown in FIG. 2, the sheet 4 becomes hard.

In this embodiment, the base and auxiliary leaf springs 5 and 6 are made of rectangular flat plates filled with inorganic resin and molded. However, they are not limited to this, and may be made of circular flat plates, for example. Alternatively, a sheet of elastic material such as a resin or a steel plate may be pressed and molded. Further, although the threaded portion 7 is rotated by the flexible wire 8 and the knob 9, it may be rotated electrically using a motor or the like.

[Effects of the invention] As described above, according to this invention, the invention includes a base leaf spring, an auxiliary leaf spring stacked on the lower part of the base leaf spring, and a threaded part that is rotatably operated by the operating part. , the spring is easy to manufacture and inexpensive, and the load can be received on the surface and good cushioning properties can be obtained. In addition, the spring constant of the spring can be changed with a simple structure,
You can change the hardness of the sheet.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a seat according to an embodiment of this invention, FIGS. 2 and 3 are sectional views of the seat of this embodiment, and FIG. 4 is an external perspective view of a conventional seat. DESCRIPTION OF SYMBOLS 1...Seat frame, 5...Base leaf spring, 6...Auxiliary leaf spring, 7...Threaded portion, 8...Flexible wire, 9...Knob.

Claims (1)

[Scope of utility model registration request] A base leaf spring is bridged between the seat frames and the center side is deformed downward, and an auxiliary leaf spring is stacked on the bottom of this base leaf spring, and the spacing between these leaf springs is adjusted by rotating. 1. A seat comprising: a threaded portion; and an operating portion that rotates the threaded portion via a connecting member.