JPH1061629A - Two member connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the pulling-out of a shaft from a hole with a simple and inexpensive machining operation, and to prevent the damaging of shaft sliding or a bearing even if shifting or inclination from the original direction occurs in the shaft when the shaft is slid in an oblong bearing hole of the bearing member. SOLUTION: Oblong holes 7 are respectively formed in the left and right side walls of a seat receiving boy (one member) 5, synthetic resin bearing members 18 having oblong bearing holes 9 are fitted in these oblong holes 7, the left and right outer side faces of a back bar 10 are placed opposite each other between the side walls of the seat receiving body 5, a shaft 9 is inserted into the shaft holes 13 of lateral direction formed to penetrate the back bar 10 and the bearing holes 19 of the bearing members 18, both members are connected to each other, a head part having a diameter larger than a shaft diameter is provided in one end of the shaft 9, a caulking part 23 is formed in the other end of the same and this caulking part 23 is caulked to be opened outside in a trumpet shape with respect to a surface orthogonal to the shaft 9 and then attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for connecting two members so as to be relatively movable in a specific direction. Specifically, a long hole parallel to each other is formed on each of the left and right side walls of one member. A bearing member made of a synthetic resin material having an oval bearing hole is fitted into the elongated hole, and the left and right outer surfaces of the other member are opposed to each other between the side walls. The present invention relates to a two-member connection structure in which a shaft is inserted through a left-right shaft hole and a bearing hole of the bearing member, and the two members are connected so as to be relatively movable in the longitudinal direction of the long hole.

[0002]

2. Description of the Related Art Conventionally, in this type of connecting structure, a head having a diameter larger than the diameter of the shaft is provided at one end of the shaft, and a circumferential groove is formed at the other end. After the insertion, an E-ring or a C-ring is engaged with the groove to prevent the shaft from falling out of the hole, or the other end of the shaft is crushed to expand the same diameter as the above-mentioned head. Is formed to prevent the shaft from falling out of the hole.

[0003]

Among the above-mentioned conventional ones in which an E-ring or a C-ring is engaged with the former groove, not only high precision is required for shaft groove processing, but also a ring However, there is a problem that the cost is increased because the engagement is difficult.

In addition, when the shaft slides in an oval bearing hole of the bearing member, if the shaft is deviated or tilted from its original direction, the shaft is expanded into a ring in the former case and expanded in the latter case. A load in the torsion direction is generated in the radial portion, and in the former, the ring comes off and moves in the direction in which the shaft comes off, and in the former, the outer periphery of the ring, in the latter, the outer periphery of the enlarged diameter portion, the bearing made of synthetic resin material There is a problem in that it bites into the outer surface of the member, hinders sliding of the shaft, and causes damage to the bearing portion.

According to the present invention, to solve such a problem, the shaft can be prevented from coming off from the hole by simple and inexpensive processing, and the shaft slides in an oval bearing hole of the bearing member. In this case, even if the shaft is displaced or tilted from the original direction, the stopper member is prevented from falling off, the sliding of the shaft is not hindered, and the bearing portion is not damaged. It is an object of the present invention to provide a member connecting structure.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) In each of the left and right side walls of one of the members, a long hole parallel to each other is formed, and a bearing member made of a synthetic resin material having an oval bearing hole is fitted into the long hole. The left and right outer surfaces of the other member are opposed to each other between the walls, and a shaft is inserted through a left and right axial hole drilled so as to penetrate the other component member and a bearing hole of the bearing member. In a connection structure of two members connected so as to be relatively movable in the longitudinal direction of the long hole, a head having a diameter larger than the shaft diameter is provided at one end of the shaft, and a hollow caulking portion is provided at the other end of the shaft. Forming
The caulked portion is caulked in a trumpet shape that opens outward with respect to a plane perpendicular to the axis.

(2) In the above item (1),
A trumpet shape that opens outward at an angle of 10 to 30 degrees with respect to a plane perpendicular to the axis.

(3) In the above item (1) or (2), the outer diameter of the caulked portion is smaller than the shaft diameter.

(4) In any one of the above items (1) to (3), one of the constituent members is a seat receiver of a chair, and the other constituent member is a back rod for supporting a backrest of the chair.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is generally used in any mechanism for connecting two members by a long hole and a shaft passing therethrough. Here, as an example, a seat and a backrest of a chair are used. This will be described with reference to those used for the tilting mechanism.

FIG. 4 illustrates such a tilting mechanism of a chair. A leg (2) having a caster (1) is fixed to a pillar (3) containing a gas spring. , Pedestal
A base frame (4) is attached to the upper end of (3).

FIG. 4 and FIG. 1 which is an exploded perspective view of a main part thereof.
As shown in (5), the seat frame (5) and the back rod (10) supporting the backrest are connected to the base frame (4) by three connecting portions (A), (B) and (C). I have. That is, the seat receiver (5) is
Slot (6) formed in (4) and slot formed in seat receiver (5)
A pair of front and rear shafts (8) and (9) slidably fitted to (7) are supported by the base frame (4). The rear shaft (9) passes through a shaft hole (13) (see FIG. 1) drilled at the front end of the back rod (10), and the shaft (9) protrudes from the middle part of the back rod (10). 11) is fitted into an elongated hole (12) formed on the rear side of the seat receiver (5).

[0013] The structure of the connecting portion formed by the elongated hole and the shaft allows the seat receiver (5) to be moved when the seated person leans on the backrest.
The backrest, and therefore, in conjunction with the rearward rotation of the back rod (10), in order to cause the exercise to lean backward while moving backward,
The seated person rotates backwards around the pelvis (point P) without difficulty. Also, at this time, the exercise center (Q) of the seat approaches the position of the ankle of the seated person's foot, so that the lower leg is not pulled upward.

As shown in FIG. 1 and FIG.
(B) The long hole (6) is formed on the upper surface of the base frame (4) with the inclined surface (14) formed on the upper right and left edges of the base frame (4) and the seat receiver (5). It is formed by an inclined surface (16) formed on the lower surface of the mounting plate (15) to be covered. A bearing member (17) is fitted on the shaft (8), and the upper and lower surfaces of both left and right ends of the bearing member (17) are brought into contact with upper and lower inclined surfaces (16) and (14).

In the connecting portion (A), an oval bearing member (18) made of a synthetic resin material is inserted from the inside of an elongated hole (7) formed in the left and right side walls of the seat receiver (5). ing. This bearing member
(18) is a small-diameter portion (18a) (see FIG. 3) fitted in the elongated hole (7) in the same shape as the elongated hole (7) of the seat receiver (5), and a side wall of the seat receiver (5). It has a large-diameter portion (18b) that comes into contact with the inside, and an oval bearing hole (19) is formed in the center.

Between the left and right side walls of the seat receiver (5) and between the left and right bearing members (18) described above, there are shaft holes (drilled in the lower portions of the left and right side walls of the back rod (10)). 13) and between both side walls of the back rod (10), the bearing member (2) housed in the concave portion (20) of the base frame (4).
The shaft (9) is inserted through the shaft hole (13) of the back rod (10), the bearing hole (19) of the bearing member (18), and the shaft hole (22) of the bearing member (21). ing.

As shown in FIG. 2, the shaft (9) has a head (9a) having a diameter larger than the shaft diameter at one end and a hollow caulking hole at the other end. (23) is drilled. The portion in which the caulking hole (23) is formed, that is, the outer diameter of the caulking portion is slightly reduced to form a reduced diameter portion (24).

After insertion of the shaft (9), as shown in FIG. 3, the reduced diameter portion (24) of the caulking hole (23) having a relatively thin wall thickness is caulked by a spatula, and as shown by an imaginary line, It is deformed into a trumpet shape that opens outward by an angle θ of about 10 to 30 degrees with respect to a vertical plane perpendicular to the axis (8).

In the connecting portion (C), an oval bearing member (25) exactly the same as the above-mentioned bearing member (18) is fitted into an elongated hole (12) formed in the seat receiver (5). Have been combined. This bearing member
(25) also has a bearing hole (26) similar to the bearing hole (19).

A back rod (10) is inserted between the bearing members (25) fitted into the elongated holes (12) of the seat receiver (5), and the shaft holes (27) are inserted into the bearing members (25). The shaft (11) is inserted into the bearing hole (26). At the other end of the shaft (11), a caulking hole and a reduced diameter portion exactly the same as the caulking hole (23) described in detail with reference to FIG. 3 are formed.
1) is installed.

[0021]

According to the present invention, the following effects are exhibited by adopting the above configuration. By forming a circumferential groove on the shaft and performing a simple and inexpensive processing without performing a troublesome processing such as engaging an E ring or a C ring in this groove,
The shaft can be reliably prevented from coming off from the hole, and when the shaft slides in an oval bearing hole as in the case of using an E-ring or the like, a notch such as an E-ring is used. There is no danger that the gear will fall off by engaging with the bearing hole.

When the caulking portion is caulked so as to open outward at an angle of 10 to 30 degrees with respect to a plane perpendicular to the shaft, the shaft slides in the bearing hole. When moving, even if the shaft is deflected or tilted from its original direction, the outer periphery of the caulked portion does not contact the outer surface of the bearing member made of synthetic resin material. No load is generated, and the sliding of the shaft is not hindered, and the bearing member is not damaged.

When the outer diameter of the caulked portion is smaller than the shaft diameter, the shaft can be easily inserted into the oblong hole and the circular hole.

When one member is a seat receiver of a chair and the other member is a back bar of the chair, it is possible to provide a chair having a small number of parts and easy to assemble.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a chair provided with an embodiment of the present invention.

FIG. 2 is an enlarged side view of a connecting shaft of the two members shown in FIG. 1;

FIG. 3 is an enlarged vertical sectional front view of a connection portion between a seat receiver and a back rod.

FIG. 4 is a schematic configuration diagram of a chair to which the present invention is applied.

[Explanation of symbols]

 (A) (B) (C) Connecting part (1) Casters (2) Legs (3) Pillar (4) Base frame (5) Seat receiver (one member) (6) (7) Slot ( 8) (9) Axis (9a) Head (10) Back rod (other member) (11) Axis (12) Long hole (13) Shaft hole (14) Inclined surface (15) Mounting plate (16) Inclined surface (17) Bearing member (18) Bearing member (18a) Small diameter part (18b) Large diameter part (19) Bearing hole (20) Concave part (21) Bearing member (22) Shaft hole (23) Swaged hole (24) Reduced diameter Part (25) Bearing member (26) Bearing hole (27) Shaft hole

Claims (4)

[Claims] 1. A left and right side wall of one member is provided with a long hole parallel to each other, and a bearing member made of a synthetic resin material having an oval bearing hole is fitted into the long hole.
Between the side walls, the left and right outer surfaces of the other member are opposed to each other,
Two members in which a shaft is inserted through a shaft hole in the left and right direction drilled so as to penetrate the other component member and a bearing hole of the bearing member, and the two members are connected so as to be relatively movable in the longitudinal direction of the long hole. In the connection structure, a head having a diameter larger than the shaft diameter is provided at one end of the shaft, and a hollow caulking portion is formed at the other end of the shaft, and the caulking portion is formed on a surface orthogonal to the shaft. A two-member connection structure characterized by being caulked in a trumpet shape that opens outward. 2. The caulking portion is set at 1 to a plane perpendicular to the axis.
2. The two-member connection structure according to claim 1, wherein the horn has a trumpet shape that opens outward at an angle of 0 to 30 degrees. 3. The two-member connection structure according to claim 1, wherein the outer diameter of the caulked portion is smaller than the shaft diameter. 4. One of the components is a seat receiver for a chair,
The two-member connection structure according to any one of claims 1 to 3, wherein the other component is a back rod for supporting a backrest of the chair.