JPH0131084Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a support body that rotatably supports a seat body.

(Prior art) This type of conventional rotating support consists of an outer ring, an inner ring, and a ball that are separately formed between the seat of the seat body and a base for supporting the seat body. The seat body is rotatably assembled to the base with a thrust ball bearing member interposed therebetween.

(Problems to be solved by the invention) However, with the above structure, the number of parts increases, the weight increases, the manufacturing cost also increases, and the position of the seat of the chair body is different from the base. Due to the base and the thrust ball bearing member, the seat is raised considerably above the mounting surface of the base, making the chair unstable.

This invention was developed in view of the above problems, and the purpose is to create a structure that is extremely simple and has a small number of parts, and that allows the chair to be kept at a lower position than before with respect to the mounting surface. It is an object of the present invention to provide a rotating support that can be supported freely in rotation.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes an annular rotating frame fixed to the back surface of the seat of the chair body, and a rotating frame fixed to the bottom surface of the rotating frame. annular holding frames facing each other, the rotating frame and the holding frame have diameters close to the width of the seat surface of the seat, and are locked to either the rotating frame or the holding frame. A locking part that
A sliding body having a sliding contact portion that slides on the other is interposed between the rotating frame and the holding frame, so that the rotating frame is rotatably supported with respect to the holding frame. .

(Function) According to the present invention, it is possible to arrange the seat of the chair body at a low position close to the mounting surface,
Moreover, the main body of the chair can be rotated stably.

(Example) An example of the rotating support according to the present invention will be described below based on the drawings.

First, the seat body 1 shown in the figure has a seat part 1a and a back part 1b, and a free end part of a seat frame 11 formed by bending a pipe in a U-shape, and a free end part of a seat frame 11 formed by bending a pipe in a U-shape. The free ends of the bent back frame 12 are connected to each other by a ratchet fitting 13 of a known structure, and each frame 11, 12 and the ratchet fitting 13 are entirely covered with a cushion material 14 such as urethane foam. This cushion material 14 is wrapped in a cloth 15 sewn into a bag shape.

Therefore, the rotary support according to the present invention supports the above-mentioned seat main body 1 in a rotatable manner, and basically has an annular shape fixed to the back side of the seat of the seat main body 1. The rotating frame 2 and the chair body 1
It consists of an annular holding frame 3 placed on a mounting surface S facing the rotating frame 2, and a plurality of sliding bodies 4 made of hard synthetic resin.

The rotation frame 2 is made of iron material, and has a width L of the seat surface of the seat portion 1a constituted by the seat frame 11.
It is formed to have approximately the same diameter as, and the cross section is approximately an inverted U.
It has a letter-shaped upper wall 21 that overlaps the back surface of the seat portion 1a, and an inner wall 22 and an outer wall 23 that extend downward from both ends of the upper wall 21.

Then, brackets 24 are fixed to the inner wall 22 by welding, and the rotating frame 2 is secured to reinforcing frames 16, 16 installed on the seat frame 11 with bolts 17 via the brackets 24.

Further, the holding frame 3 is made of iron material like the rotating frame 2, and is formed to have a diameter that is approximately the same as the width L of the seat surface of the seat part 1a constituted by the seat part frame 11. Bottom wall 31 resting on surface S
and an inner wall 3 extending upward from both ends of the bottom wall 31.
2 and an outer wall 33, and an engagement flange 34 extending horizontally inward at the upper end of the inner wall 32.
has been established.

Then, the holding frame 3 is opposed to the lower surface of the rotating frame 2, and both side walls 32, 33 of the holding frame 3 and the engaging flange 34 are connected to the both side walls of the rotating frame 2.
By fitting between 2 and 23, an annular chamber 5 is formed between the rotating frame 2 and the holding frame 3, while screws 25 are screwed onto the inner wall 22 of the rotating frame 2. By making the tip of the screw 25 overlap the engagement flange 34 provided on the holding frame 3 in the vertical direction, the rotating frame 2 is integrally assembled to the holding frame 3. There is.

The sliding body 4 is made of a synthetic resin material (containing carbon) with excellent oil resistance and abrasion resistance, and has a cylindrical main body with a hemispherical tip in the center of its upper surface. A sliding contact portion 41 and a pair of sub sliding contact portions 42 and 43, which are shorter than the main sliding contact portion 41 and have hemispherical tips, are provided protrudingly sandwiching the main sliding contact portion 41, Normally, the inner surface of the upper wall 21 of the rotating frame 2 is brought into sliding contact with the main sliding contact portion 41.

Furthermore, locking portions 44 and 45 that protrude outward are integrally formed on both sides of the sliding body 4, and as the sliding body 4 is inserted into the annular chamber 5, the locking portions 44, 45
are fitted into the engagement grooves 34 and 35 formed in the inner and outer walls 32 and 33 of the holding frame 3, and the free end surface of one of the locking parts 45 is fitted into the outer wall 2 of the rotation frame 2.
3 the outer wall 33 of the holding frame 3, facing the inner surface.
This structure prevents the rotary frame 2 from coming into direct sliding contact with the outer wall 23 of the rotating frame 2.

Reference numeral 18 in the figure indicates an armrest attached to the seat frame 11 or the back frame 12 via rods 19, 19.

Further, in the figure, reference numerals 20, 20 are protrusions which are annularly protruded from the inner surface of the upper wall 21 of the rotating frame 2, and these protrusions 20, 20 are designed to guide the sliding body 4. ing.

In the embodiment shown in the figure, grease is applied to the inner surface of the upper wall 21 between the protrusions 20 and 20 of the rotating frame 2 to reduce the sliding resistance of the rotating frame 2 with respect to the sliding body 4. It has become.

As shown in FIGS. 5 and 6, the rotating support configured as described above is attached to the back surface of the seat portion 1a of the chair body 1 via the brackets 24, and is attached to the bottom of the holding frame 3. The wall 31 is placed directly on the placement surface S.

Therefore, the rotating frame 2 is relative to the holding frame 3,
Since it is freely rotatable via the sliding body 4 fixed to the holding frame 3, the seat main body 1 attached to the rotating frame 2 can be rotated freely on the holding frame 3, in other words, on the mounting surface S. It rotates smoothly against the

By the way, if the main sliding contact part 41 is worn out or damaged due to the rotation of the rotating frame 2, the sub sliding contact parts 42 and 43 will be removed from the rotating frame 2. Since the rotating frame 2 comes into sliding contact with the inner surface of the upper wall 21, there is no possibility that the rotating frame 2 will become unable to rotate with respect to the holding frame 3.

Therefore, only the rotating support body is interposed between the chair main body 1 and the placement surface S, and the holding frame 3 constituting the support body is interposed between the seat body 1 and the placement surface S. Since the seat portion 1a of the chair body 1 is placed directly on the mounting surface S, the seat portion 1a of the chair body 1 is placed at a very low position with respect to the placement surface S, and therefore the seat body 1 is placed directly on the rotating frame. 2 and the diameter of the holding frame 3 is the seat portion 1a.
Coupled with the fact that it is formed to be approximately the same width L as the seat surface, it is supported stably.

In the above embodiment, the inner wall 3 of the holding frame 3
An engagement flange 34 is provided at the upper end of the rotating frame 2.
By vertically overlapping the tip of the screw 25 screwed onto the inner wall 22 of the screw 25 with the engagement flange 34 provided on the holding frame 3, the rotating frame 2 and the holding frame 3 can be integrally connected. For example, as shown in FIG. 7, a stepped portion 36 is formed on the inner wall 32 of the holding frame 3, and the screw 25 screwed onto the inner wall 22 of the rotating frame 2 is inserted into the stepped portion. 3
6, the rotating frame 2 and the holding frame 3 may be integrally assembled. In this case, both the engaging grooves 34, 35
By making the free end surfaces of both the locking parts 44, 45 that fit into the inner and outer walls 22, 23 of the rotating frame 2 face the inner and outer walls 22, 23 of the rotating frame 2, the inner and outer walls 32,
33 may be configured to prevent direct sliding contact with the inner and outer side walls 22, 23 of the rotating frame 2.

Further, in the above embodiment, the diameters of the rotation frame 2 and the holding frame 3 are made approximately the same as the width L of the seat surface of the seat portion 1a, but are made slightly smaller than the width L of the seat surface. In short, the diameters of the rotating frame 2 and the holding frame 3 may be large enough to stably support the seat body 1 in rotation.

Further, in the above embodiment, the main sliding contact portion 41 and the sub sliding contact portions 42 and 43 are provided on the sliding body 4, but the sub sliding contact portions 42 and 43 are not necessarily necessary, and the main sliding contact portion 41 The shape is not limited to a hemispherical shape, but may be any shape that does not provide a large sliding resistance to the rotation of the rotating frame 2 relative to the holding frame 3.

Further, in the above embodiment, the sliding body 4 is locked to the holding frame 3 side, and the inner surface of the upper wall 21 of the rotating frame 2 is brought into sliding contact with the main sliding contact portion 41 of the sliding body 4. However, the sliding body 4 may be locked to the rotating frame 2 side, and the main sliding contact portion 41 may be brought into sliding contact with the inner surface of the bottom wall 31 of the holding frame 3.

(Effects of the invention) As described above, the rotating support according to the invention includes an annular rotating frame fixed to the back surface of the seat of the chair body;
It consists of an extremely small number of parts, including an annular holding frame that faces the lower surface of the rotating frame, and a sliding body that is interposed between the rotating frame and the holding frame and is locked to either one of them. Since it is a product, manufacturing costs are reduced accordingly, and assembly is extremely easy.

Also, according to the present invention, the distance between the seating surface of the chair and the seat of the chair body can be narrowed, so the height of the seat of the chair body can be lowered than that of conventional ones. Moreover, since the diameters of the rotating frame and the holding frame are close to the width of the seat surface of the seat, the chair body rotates smoothly while being stably supported. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the rotating support according to the present invention, FIG. 2 is an enlarged sectional view taken along the line of FIG. 1, FIG. 3 is an enlarged sectional view taken along the line of FIG. 1, and FIG. A perspective view of the sliding body, FIG. 5 is a partially omitted side view showing the rotary support of the present invention attached to the seat body, FIG. 6 is a partially omitted back view, and FIG. 7 is a separate view. FIG. 2 is an enlarged cross-sectional view of main parts showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Chair body, 1a... Seat part, 2... Rotating frame, 3... Holding frame, 4... Sliding body, 41... Main sliding contact part (sliding contact part), 42, 43... ...Sub sliding contact part (sliding contact part), 44, 45...Locking part.

Claims (1)

[Scope of utility model registration request] A support body that rotatably supports a seat main body, comprising an annular rotating frame fixed to the back surface of the seat of the seat main body, and an annular holding frame opposite to the rotating frame, A locking portion that locks to either one of the rotation frame or the holding frame, while the diameter of the rotation frame and the holding frame is set to a size close to the width of the seat surface of the seat portion;
A sliding body having a sliding contact portion that slides on the other side is interposed between the rotating frame and the holding frame, so that the rotating frame is rotatably supported with respect to the holding frame. A rotating support for a seat chair.