JP3687017B2 - Bearing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a bearing structure, particularly a chair base, which allows movement between both components by sliding a shaft attached to the other component in a long hole provided in one component. The present invention relates to a shaft bearing structure for connecting a frame and a seat.
[0002]
[Prior art]
Conventionally, in this type of device, a bearing member made of a synthetic resin material having a long hole is attached to one constituent member, and a shaft provided on the other constituent member is slidably fitted into the long hole of the bearing member. It is known that the other constituent member can be moved slightly in a specific direction with respect to the one constituent member by combining.
[0003]
[Problems to be solved by the invention]
In the above-described conventional apparatus, a shaft having a circular cross section is usually used. Therefore, the contact between the shaft and the bearing member is an upper and lower line contact, and the load is concentrated on the lower line contact portion. Shafts due to wear are likely to occur, and when assembling, a bearing member made of a synthetic resin material is fitted into one component member, and then a shaft hole drilled in the left and right side plates of the other component member Is aligned with the long hole of the bearing member, the shaft in the left-right direction is inserted into all of the holes, and one end of the shaft must be prevented from coming off by a retaining ring, etc. There was a problem.
[0004]
In order to solve such problems, an object of the present invention is to provide a bearing structure in which rattling due to wear due to repeated use is unlikely to occur and assembly is easy.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In a bearing structure in which a shaft attached to the other component member is slidably fitted along the longitudinal direction of the elongated hole in a long hole provided in one component member,
It said axis, have a outer surface in surface contact with the parallel surfaces facing in the slot, made from a molding of synthetic resin material cross section forms a substantially U-shape, therein, the arc portion equal to the shaft diameter The slider is formed, and the outer surface of both arms is fitted with a slider that is a linear portion that is in surface contact along the parallel surface of the elongated hole, and the slider is slid into the elongated hole. Fit freely.
[0006]
( 2 ) In the above item (1 ) , a locking portion for locking the shaft is formed on the inner surface of the opening end of the slider having a substantially U-shaped cross section.
[0007]
( 3 ) In the above item (1) or ( 2 ) , two elongated holes that are parallel to each other with a space in the left-right direction are formed in one component member, and are fitted to a shaft attached to the other component member. Both ends of the combined slider are fitted into the long holes, respectively, and a notch is provided in an intermediate portion of the slider.
[0008]
( 4 ) In any one of the above items (1) to ( 3 ), one constituent member is a base frame of a chair, the other constituent member is a seat receiver, and a left-right direction between left and right side plates of the seat receiver A shaft that faces the upper surface of the base frame is fitted with a slider whose upper and lower surfaces are parallel to the shaft, and a part of the lower surface of the mounting plate attached to the upper surface of the base frame. A long hole is formed by facing the inclined surfaces formed in parallel to each other so as to be parallel to each other, and the slider is slidably fitted into the long hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In general, the present invention can be applied to any mechanism that allows two constituent members to move relative to each other in the longitudinal direction of the long hole by connecting the shaft and the long hole. As an example, a description will be given of an example applied to a chair seat and a backrest tilting mechanism.
[0010]
FIG. 4 illustrates such a tilting mechanism of a chair. A leg column (3) with a built-in gas spring is fixed to a leg (2) provided with a caster (1). A base frame (4) is attached to the upper end of (3).
[0011]
As shown in FIG. 4 and FIG. 1 which is an exploded perspective view of the main part, the base frame (4) includes a seat receiver (5) and a backrest (10) having three connecting portions (A). (B) Linked by (C).
That is, the seat receiver (5) has a pair of front and rear slidably fitted into a long hole (6) formed in the base frame (4) and a long hole (7) formed in the seat receiver (5). These shafts (8) and (9) are supported by the base frame (4).
Rear shaft (9) is inserted into a Se杆shaft hole bored into the front end (10) (13) (see FIG. 1), the axis of the Nuki挿 in the middle of the back rod (10) (11) The seat receiver (5) is fitted into a long hole (12) provided on both sides of the rear part.
[0012]
The structure of the connecting portion by such a long hole and the shaft interlocks with the seat receiver (5) when the seated person leans against the backrest, and the backrest and thus the backrest (10) is rotated backward. and, while moving back and is intended for causing the movement to tilt back, the seat occupant, mainly in the vicinity of the pelvis (P point), Ru cormorants gradient without excessive back. At this time, since the seat motion center (Q) is close to the position of the heel of the seated person, the lower leg is not pulled upward.
[0013]
As shown in FIGS. 1 to 3, both ends of the shaft (8) of the connecting portion (B) are fixed to the left and right side walls of the seat receiver (5). The long hole (6) corresponding to the shaft (8) has an inclined surface (14) formed on the upper edges of the left and right sides of the base frame (4) and the base frame (4) across the seat receiver (5). And an inclined surface (16) formed on the lower surface of the mounting plate (15) that covers the upper surface of the substrate. These inclined surfaces (14) and (16) form parallel surfaces that face the long holes ( 6 ) .
[0014]
A slider (17) is fitted to the front shaft (8) fixed to the seat receiver (5).
Details of the slider (17) are shown in FIG. The slider (17) is made of a synthetic resin material and has a substantially U-shaped cross-section in cross section. On the inner surface of the slider (17) is an arc portion (18) having a diameter substantially equal to the diameter of the shaft (8). ) is formed, the opening portion side engages with the shaft (8), and has a locking portion to be its anti-removal (19).
[0015]
Linear portion of the outer surface of the upper and lower arms of the slider (17) (20), opposing parallel surfaces of the long hole (6) described above, that is, abut against the flat inclined surface (14) (16), These parallel surfaces have a length in the front-rear direction that is considerably shorter than the length in the front-rear direction.
The slider (17) has a length in the left-right direction that covers almost the entire length of the shaft (8), and a notch (21a) (21b) is formed in the intermediate portion. Notches (21a) is to have been cut from the distal end of the both arm portions (20), also notches (21b), the connecting portion connecting the both arm portions (20) (22), as the horizontal elongate hole It is cut out.
Reference numeral (23) denotes a set hole used during assembly.
[0016]
As shown in FIG. 2, the mounting plate (15) is mounted on the base frame (4) after the slider (17) fitted to the shaft (8) is fitted, and then the bolt ( It is fixed with 24).
[0017]
【The invention's effect】
According to the first aspect of the present invention, the slider having a parallel surface facing the sliding direction attached to the shaft slides in the long hole, and the bearing is arranged on the parallel surface facing the sliding direction of the long hole. since the parallel surfaces of the members are in surface contact, the load applied to the shaft is dispersed, repeated use by rather backlash difficulty occurs for wear, also be easily fitted to the slider in the axial it can.
[0018]
When claim 2 Ru good to the invention described, the slider is never disengaged laterally from the shaft in a state of being inserted into the long hole.
[0019]
When claim 3 Ru good to the invention described, it slider is, given the flexibility at the intermediate portion, thereby, even if there is a slight shift from side to side movement of the shaft, to absorb force by this deviation Can do.
[0020]
When claim 4 Ru good to the invention described, chair base frame, a seat receptacle, the mounting plate or the like, without depending on a special die-cast or the like, can be manufactured easily and inexpensively by press working or the like of the plate material, Also, assembly is easy.
[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 vertical sectional view of the main part of the same.
FIG. 3 is an enlarged perspective view of a slider.
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) Leg
(3) pedestal
(4) Base frame
(5) Seat receptacle
(6) (7) Long hole
(8) (9) axis
(10) dorsal fin
(11) axis
(12) Long hole
(13) Shaft hole
(14) Inclined surface
(15) Mounting plate
(16) Inclined surface
(17) Slider
(18) Arc part
(19) Engagement part
(20) the arm portion
(21a) (21b) Notch
(22) Connecting part
(23) Set hole
(24) Bolt

Claims (4)

In the bearing structure in which the shaft attached to the other component member is slidably fitted along the longitudinal direction of the elongated hole in the elongated hole provided in one component member,
It said axis, have a outer surface in surface contact with the parallel surfaces facing in the slot, made from a molding of synthetic resin material cross section forms a substantially U-shape, therein, the arc portion equal to the shaft diameter The slider is formed, and the outer surface of both arms is fitted with a slider that is a linear portion that is in surface contact along the parallel surface of the elongated hole, and the slider is slid into the elongated hole. bearing structure, characterized in that the freely fitted. The cross-sectional shape, the bearing structure of claim 1 Symbol placement on the inner surface of the opening end of the slider which is a substantially C-shaped, characterized in that the formation of the locking portion for locking the supporting shaft. Two elongated holes that are parallel to each other with a space in the left-right direction are formed in one component member, and both end portions of a slider fitted to a shaft attached to the other component member are formed in the elongated holes. the bearing structure according to claim 1 or 2 fitted respectively, characterized in that a notch in the middle portion of the slider. One constituent member is a base frame of the chair, the other constituent member is a seat receiver, and a shaft facing in the left-right direction is attached between the left and right side plates of the seat receiver, and the upper and lower surfaces are parallel to this shaft. The inclined surface formed on the upper edge of the base frame and the inclined surface formed on a part of the lower surface of the mounting plate attached to the upper surface of the base frame are opposed to each other so as to be parallel to each other. hole is formed, the bearing structure according to any one of claims 1 to 3, characterized in that the slider in the elongated hole fitted slidably.

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