JPH0120904Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a support structure for a storage arm for a built-in chair attached to, for example, a work desk in a garment factory, a table in a dining room, a desk for operating OA equipment in an office, etc. .

<Prior art> Conventionally, the above-mentioned desk built-in chairs are easy to take out and store, and the chair itself does not take up floor space and is easy to clean and store. It is used in order not to obstruct the movement of the chair, and its structure is such that the base end of the storage arm that supports the chair is supported by a vertical axis, and the storage arm is rotated horizontally to move on a single rotational trajectory. This allows the chair to be stored inside the desk and taken out from inside the desk. It is known that the above-mentioned storage arm has an urging force such as a spring applied to the storage arm at all times in the direction of storing the chair in the free state.

<Problems to be solved by the invention> However, in the conventional mechanism as described above, in order to store the chair inside the desk in a free state,
It is necessary to use a spring with a certain strong elasticity, which is expensive in terms of cost, and when a seated person leaves their seat, the urging force due to the elasticity hinders the movement of the person leaving the seat, and it is difficult to use when both hands are occupied. etc. were particularly inconvenient.

In addition, unless a long spring is used, the biasing force of the spring is greatest when the chair is taken out, so when the seated person leaves the seat and releases the load, the speed at which the storage arm returns to rotation accelerates. The disadvantage is that when the machine stops inside the desk, it generates a large impact, which may collide with various devices under the tabletop or cause large vibrations to precision instruments, electronic parts, etc. installed on the desk. There are drawbacks such as negative effects.

<Means for Solving the Problems> The support structure of the present invention that solves the above problems supports the chair 27 at the tip below the top plate 3 of the desk 1, and supports the boss provided on the side of the desk 1. In the storage arm 19 which is rotatably supported by inserting the arm shaft 21 at the base end into the storage arm 17, the chair 27 is automatically stored under the top plate 3 due to its own weight when it is not in use. As such, the axes of the boss 17 and the arm shaft 21 are inclined by a predetermined inclination angle θ toward the inside of the desk.

<Function> In the storage arm support structure of the present invention, since the axis of the arm axis, which is the rotation fulcrum of the storage arm, is inclined at a certain angle toward the inside of the desk with respect to the vertical line, the arm and chair The storage arm, which supports the weight of the storage arm, rotates in the direction of its inclination and is naturally stored in a predetermined position under the desk top.

The rotation speed during storage is the rotation resistance of the rotation fulcrum,
In addition to the weight of the chair on the storage arm,
Basically, it is determined by the amount and direction of inclination of the axis of the arm shaft, and the rotation speed when retracting and the magnitude of impact when stopping can be easily set by design or experiment.

<Embodiments> The embodiments shown below will be described in detail. The drawings show a case where the support structure of the present invention is applied to a sewing desk on which an industrial sewing machine is mounted.

The desk 1 has L-shaped legs 5, 5 attached to the left and right sides of the lower surface of the top plate 3, and a beam 7 is stretched between the legs 5, 5. A bracket 11 that supports the mounting shaft 9 in the vertical direction is attached to the outer side of the bottom of one of the legs (the left leg). It is rotatably supported laterally via a boss 15 at the base end.

An upward arm shaft 21 provided at the base end of a storage arm 19 formed by bending a pipe is fitted into the boss 17 at the tip of the mounting arm 13, and rotatably supports the storage arm 19. 23 is a stopper that supports the arm shaft 21 on the boss 17. A bearing case 25 made of pipe material is fixed in a substantially vertical direction at the other end of the storage arm 19, and a slide shaft 29 made of pipe, which is a support for a chair 27, is fitted into the bearing case 25 so as to be able to move up and down. ing.

The slide shaft 29 has an end plate puller attached to the lower end for grounding, and a rubber 33 is attached to the bottom surface of the slide shaft 29.
A mounting post 37 having a flange-shaped mounting seat 35 fixed thereto is inserted and supported at the upper open end so as to be adjustable in height and rotatable. A seat with a backrest 39 for sitting is attached to the upper surface of the mounting seat 35.

A cylindrical buffer ring 43 with an open bottom is fixed to the upper end of the bearing case 25 via a countersunk ring-shaped ring holder 41 by screwing or the like. They are fitted together so that they can move freely. The lower circumferential wall of the buffer ring 43 has a skirt shape that covers the upper end of the bearing case 25, and an O-ring accommodating portion 45 consisting of a sealed ring-shaped space is provided between the inner circumferential surface and the circumferential surface of the slide shaft 29. In the O-ring accommodating portion 45, an O-ring 47 made of a wear-resistant elastic member such as elastic rubber or plastic is fitted onto the slide shaft 29. Further, the upper part of the O-ring accommodating part 45 (the inner surface of the buffer ring 43 on the bearing case side) is formed with a locking part 49 consisting of a tapered surface that faces upward and slopes inward. A release portion 51 is formed with a tapered surface that slopes outward toward the front.

When the O-ring 47 rises with the rise of the slide shaft 29, the locking part 49 locks the O-ring 47.
7 is pushed between the locking part 49 and the slide shaft 29 to elastically deform the cross section of the O-ring 49 according to the wedge-shaped space, and the elasticity of the O-ring itself presses the circumferential surface of the slide shaft 29. It works to gradually increase the frictional force that prevents the rise.

On the other hand, when the slide shaft 29 is lowered, the release portion 51 is pulled out from the locking portion 49 as the slide shaft 29 is lowered, so that the inner diameter of the lowered O-ring 47 is expanded. , and acts to release the frictional force between the O-ring and the slide shaft 29 while the slide shaft 29 is descending. This release portion 51 does not necessarily need to be formed at the upper end of the bearing case 25 itself.

Further, a flange-shaped spring receiver 53 is fixedly installed above the slide shaft 29.
A spring 55 is fitted around the outer periphery of the slide shaft 29 between the lower surface of the buffer ring 43 and the upper surface of the buffer ring 43 to constantly bias the slide shaft 29 upward. As a result, when a downward load is applied to the seat 39 against the spring 55, the slide shaft 29 descends until the end plate 31 reaches the floor surface 56, but when the load is released, the slide shaft 29 is raised by the spring 55.

However, when the O-ring 47 enters the locking part 49 due to the rise of the slide shaft 29, the slide shaft 29
The frictional force of the O-ring 47 acts on the circumferential surface of the O-ring 47 to suppress the slide shaft 29 from rising, and when the suppressing force due to this friction is greater than the biasing force of the spring 55, the slide shaft 29 stops rising. In this stopped state, it can be raised passively with a small amount of force (for example, lifting it lightly by hand). When the restraining force of the O-ring 47 is greater than the biasing force of the spring 55, the slide shaft 29 lowers its rising speed and rises more slowly.Whether to do so depends on the installation conditions and application of the chair. The material and diameter of the O-ring and the angle of the tapered surface of the locking part can be freely selected. The other mounting arm 13 and storage arm 19
The mounting arm rotates at the base end, allows the chair 27 to be moved to any position within the combined range of the rotational trajectories of both, and can be stored or taken out from the bottom of the desk 1. 13 and the boss 17 which is the rotation fulcrum of the storage arm 19 and the arm shaft 21
For example, the axis of the mounting arm 13 is inclined toward the center of the desk 1 by a certain angle of inclination θ at the end point of the inward rotation of the mounting arm 13.

With this configuration, when the mounting arm 13 is rotated to the inner end point, the storage arm 19 will naturally rotate toward the center of the chair 1 due to the weight of the chair 27 at its tip, and at least the mounting arm 13 will be rotated toward the inner end point. If the structure is such that the chair 27 remains stopped at a predetermined rotation position, the chair 27 will be automatically stored at a predetermined position inside the desk 1 when no one is seated and the chair 27 will not be manually pulled out from inside the desk after being stored. It will remain in its stored state for as long as possible.

<Effects of the invention> As a result of the storage arm support structure of the present invention being constructed as described above, it does not use special parts such as springs for automatically retracting the chair in a no-load state, which simplifies the mechanism and reduces costs. In addition, since the chair is retracted by arm rotation due to the chair's own weight, there is no inconvenience such as hindering the user's actions when sitting or leaving the seat, unlike when using the biasing force of a spring. Furthermore, by setting the axis angle of the arm axis, the retraction rotation speed of the storage arm can be slowed down.
It has the advantage that the impact does not have an adverse effect on the equipment under the desk or the equipment in contact with the desk.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
Figures 2 and 2 are side and front views of the main parts showing the arms of the built-in chair, Figure 3 is an overall perspective view of the desk with the built-in chair, and Figures 4 and 5 are of the lifting section of the chair. FIG. 3 is a cross-sectional view of main parts showing the structure and operating state. 1: desk, 3: top plate, 17: boss, 19: storage arm, 21: arm axis, 27: chair, θ: tilt angle.

Claims (1)

[Scope of utility model registration request] A storage arm 19 supports a chair 27 at its tip below the top plate 3 of the desk 1, and is rotatably supported by inserting an arm shaft 21 at its base into a boss 17 provided on the side of the desk 1. The axes of the boss 17 and arm shaft 21 are tilted toward the inside of the desk by a predetermined inclination angle θ so that the chair 27 is automatically stored under the top plate 3 due to its own weight when in use. A support structure for a built-in chair storage arm that is tilted.