JP2535182Y2 - Leg holding device in folding table - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, an upper end of a leg is pivotally connected to a lower surface of a top plate, and an intermediate portion of the leg and the lower surface of the top plate are connected to each other.
The present invention relates to a device in which a leg table is automatically held in a vertical use state and a horizontal folding state in a folding table connected by bending supports.

[0002]

2. Description of the Related Art An intermediate portion of a leg rod having an upper end pivotally connected to a top plate,
The folding table itself, which connects the lower surface of the top plate with a bending support rod whose ends are pivotally connected, is, for example,
No. 2833, No. 59-11634, No. 59-38898, No. 60-4421,
It is well known and described in many publications, including the publications of JP-A-62-44671.

[0003] In such a folding table, it is necessary to hold the leg rods safely and securely in a vertically expanded state and a folded horizontal state. Have been paid.

(A) Japanese Patent Publication No. 57-22833 A tension spring is used in an over-centered manner, and a bending rod is elastically held in an extended state and a bending state beyond a pivot point.

(B) When the leg rod is deployed, a spring rod provided on one of the bending support rods
Engage with the recess provided at the other end to lock both linearly.

(C) Japanese Patent Publication No. Sho 59-38898 When the refraction support rod is formed in a straight line, the projection provided on one side engages with the recess provided on the other side, and is held by a spring rod.
Both are stretched in a straight line.

(D) Japanese Patent Publication No. Sho 60-4421 When a bending rod is formed in a straight line, a pin provided on one side is engaged with a cutout provided on the other side, and the pin and the other bending rod are engaged. Then, a leaf spring that acts as an over-center is hanged over, and the bending support rod is elastically held in a linear state and a folded state.

(E) Japanese Patent Publication No. 62-44671 JP-A-62-44671 A leaf spring is provided on a surface which becomes an inner surface at the time of refraction at one end of a refraction support rod, and a surface which becomes an outer surface at the time of refraction at the other end is formed in a cam shape. The cam-shaped end portion resiliently presses the leaf spring when the bending support rod is extended and folded.

[0009]

The above-mentioned typical bending support of the folding table has at least one or more of the following problems. It is dangerous if a certain force or more is applied during extension, since it is easily bent.

The holding in the folded state is uncertain.

It is not easy to operate and requires power,
Sometimes dangerous.

[0012] In the case of using a spring, the spring force is reduced over a long period of use, and the locking action is incomplete or insufficient.

Since the number of parts is large, assembling is troublesome and expensive. The present invention has solved all of the above-mentioned problems in the same conventional type.

[0014]

According to the present invention, in the folding table, a bending support rod for connecting an intermediate portion of a leg rod whose upper end is pivotally connected to a top plate and a lower surface of the top plate has a cross section having a downwardly-facing cross section. An upper rod having a shape and having an engagement ridge formed at an important point on a lower surface of the upper piece; and a head which is pivotally mounted by fitting an upper end to a lower end of the upper rod and centered on the pivoted portion. And an eccentricity in which engagement grooves are respectively provided at upper and lower portions of the head, and an outer peripheral surface of an upper end between the engagement grooves always slides on a lower surface of an upper piece of the upper rod. Along with the lower rod having a cam, the upper rod and the lower rod are made of a hard elastic material such as synthetic resin, and with the vertical deployment of the leg rod and horizontal folding, the bending rod is When it is straight or folded in two, the upper But the eccentric fitted on the upper and lower surfaces of the engaging groove of the cam, by which is adapted to hold the refractive 支杆 in that state, the problem is solved.

[0015]

When the bending rod is extended or folded, one of the two engaging grooves on the outer periphery of the head of the eccentric cam in the lower rod engages with the engaging ridge on the upper piece of the upper rod. The bending rod is held in that state.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Lateral rods connecting intermediate parts of leg rods (1) on both sides (only the right side in the figure) of a folding table
The central portion of (2) and the lower surface slightly inward from the side end of the top plate (3) are connected by a bending support rod (4). Leg rod
(1) The upper end of (1) has a pivot (1a) in the front-rear direction,
It is pivotally attached to the lower surface of (3).

The refracting support rod (4) has an upper rod (5) having a U-shaped cross section, and a pin (6) having an upper end fitted inside the lower end thereof and pointing in the front-rear direction. 5) and a lower rod (7) pivotally attached to the lower rod (7).

The upper end of the upper rod (5) is connected to a bearing (8) fixed to a key point on the lower surface of the top plate (3), and the lower end of the lower rod (7) is
Axial rods (10) and (11) are pivotally mounted on bearings (9) fixed to the center of the inner surface of the horizontal rod (2), respectively.

The upper piece (12) of the upper rod (5) extends slightly downward beyond the pivoted portion by the pin (6), and the lower surface of the lower end of the upper piece (12) hangs perpendicularly to the upper piece (12). A flexible handle piece (13) that protrudes is provided.

On the inner surface of the base portion of the handle piece (13), that is, the surface facing the upper part of the upper rod (5), a concave groove (14) in the front-rear direction is formed.

An engaging ridge (15) in the front-rear direction is provided at a key position on the lower surface of the upper piece (12) of the upper rod (5). This engagement ridge
The position of (15) is determined so that the engagement action described later can be exerted.

A little above the handle piece (13), the upper piece
The upper surface of (12) is provided with a notched groove (16) in the front-rear direction for imparting preferable flexibility.

The lower rod (7) has an eccentric cam (1) having a spindle-shaped cross section with the upper ends of the side pieces (17) and (17) being tapered at the lower end (18).
9), engagement grooves (20) and (21) are formed at the upper and lower portions of the head (19a) of the eccentric cam (19) centering on the pin (6), respectively. Is provided.

The outer peripheral surface of the upper end of the eccentric cam (19) has an upper rod (5).
Regardless of the angle of refraction of the lower rod 7 and the lower rod 7, the upper rod 5 always comes into sliding contact with the lower surface of the upper piece 12.
The positions of the engagement grooves (20) and (21) are determined so that the operation described later can be performed.

In order to improve the movement of the handle piece (13), a notch (22) may be provided at an important part of the upper surface of the upper rod (5). The upper rod 5 and the lower rod 7 are made of a hard and relatively easily deformable material such as a synthetic resin.

As shown in FIGS. 1 and 2, when the leg rods (1) and (1) are deployed in an upright state, the bending support rod (4) is pulled straight and becomes engaged with the upper rod (5). The ridge (15) fits into the engagement groove (20) in the upper surface of the upper end of the eccentric cam (18), and
(5) and the lower rod (7) are held in that state. At this time, the concave groove (14) at the base of the handle piece (13) is fitted into the tapered edge (18) of the eccentric cam (19), and the rotation of the eccentric cam (19) is prevented.

In order to fold the leg rods (1), (1), the handle piece (13) is first tilted outward by hand, and the concave groove (14) is cut from the tapered edge (18) of the eccentric cam (19). Remove, then figure
As shown in FIG. 4, the bending rod (4) is folded upward. Then, the engaging groove (20) on the upper part of the eccentric cam (19) is disengaged from the engaging ridge (15) of the upper rod (5), and the leg rods (1) and (1) are folded.

As shown in FIG . 5 , when the two levers (5) and (7) are completely horizontal and overlapped on the lower surface of the top plate (3), the eccentric cam (19) which was originally on the lower surface is overlapped. Engagement groove (2
1) is engaged with the engaging ridge (15) of the upper rod (5), and both rods (5) and (7) are held in this state.

[0029]

[Effects of the Invention] When the bending support rod for supporting the top plate and the leg rod is linearly extended or folded horizontally, any of the engaging grooves of the eccentric cam in the lower rod is formed. The upper and lower rods are securely held by automatically engaging with the engaging ridges on the upper rod.

[Brief description of the drawings]

FIG. 1 is a lower perspective view showing a main part of a folding table provided with an embodiment of the device of the present invention in use.

FIG. 2 is a vertical cross-sectional view at the center of FIG.

FIG. 3 is a perspective view of a bending rod and its related parts.

FIG. 4 is a view similar to FIG. 2 with the legs folded;
is there.

FIG. 5 shows a state in which the legs are completely folded,
FIG.

[Explanation of symbols]

 (1) Leg rod (1a) Axis (2) Horizontal rod (3) Top plate (4) Refracting rod (5) Upper rod (6) Pin (7) Lower rod (8) (9) Bearing bracket (10) (11) Shaft rod (12) Upper piece (13) Handle piece (14) Concave groove (15) Engagement ridge (16) Notch groove (17) Side piece (18) Tapered edge (19) Eccentric cam (19a) Head (20) (21) Engagement groove (22) Notch

Claims (1)

(57) [Scope of request for utility model registration] In the folding table, a bending support rod for connecting an intermediate portion of a leg having an upper end pivotally connected to the top plate and a lower surface of the top plate has a cross section having a downward U-shape. An upper rod provided with an engagement ridge at a lower part thereof, and a head which is pivotally attached to the lower end of the upper rod by fitting an upper end thereof and which is centered on the pivoted portion; And a lower rod having an eccentric cam which has an outer peripheral surface at the upper end between the two engaging grooves and which always slides on the lower surface of the upper piece of the upper rod. With
The upper rod and the lower rod are made of a hard elastic material such as a synthetic resin, and the vertical bending of the leg rod, and the horizontal folding, along with the bending rod is straight or two-fold, A leg rod holding device in a folding table in which an engaging ridge on an upper rod is fitted into an engaging groove on an upper surface and a lower surface of the eccentric cam to hold a bending support rod in that state.