JPH0613559U - Leg rod holding device for folding table - Google Patents

Abstract

(57) [Abstract] [Purpose] The bending support that connects the leg and top of the folding table is
Hold it automatically. [Structure] The bending support 4 has a downward U-shaped cross section, an engaging protrusion 15 is provided on a lower surface portion of an upper piece 12 thereof, and the lower end of the upper piece 12 is orthogonal to the upper piece 12. An upper rod 5 provided with a handle piece 13 and having a groove 14 on the upper side surface of the base of the handle piece 13 and an upper end pivotally attached to the lower end of the upper rod 5 and centered on this pivoted portion. The head 19a is provided, and the lower rod 7 having the eccentric cam 19 having the engaging grooves 20, 21 at the outer peripheral surface points of the head 19a and the tapered edge 18 at the lower end is provided. When extending the support rod 4 and folding it in half,
The engaging projection 15 is engaged with different ones of the engaging grooves 20 and 21, and when the bending supporting rod 4 is extended, the concave groove 14 at the base of the handle piece 13 is formed into a tapered edge 18 of the eccentric cam 19. Engage with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, in the folding table in which the upper end of the leg rod is pivotally attached to the lower surface of the table top plate, and the middle portion of the leg rod and the lower surface of the top plate are connected with a bending support rod, the leg rod is set vertically. The present invention relates to a device capable of automatically, safely and securely holding it in a used state and a horizontal folded state.

[0002]

[Prior art]

 The folding table itself, in which the middle part of the leg rod whose upper end is pivotally attached to the top plate and the lower surface of the top plate are connected by the bending support rods whose end parts are pivotally attached, is described in, for example, Japanese Utility Model No. 57-22833. It is described in many publications, including 59-11634, 59-38898, 60-4421, and 62-44671, and is well known.

In such a folding table, it is necessary to hold the leg rods safely and reliably in a vertically expanded state and a folded horizontal state. For that reason, various considerations as described below are necessary. Have been paid.

(A) Japanese Utility Model Publication No. 57-22833 A tension spring is used in an over-center type, and the bending support rod is elastically held in a stretched state and a bent state beyond a pivot point.

(B) Japanese Utility Model Publication No. 59-11634 When the leg rod is unfolded, a spring rod provided on one side of the bending support rod engages with a concave portion provided on the tip of the other side to linearly lock the two. To do.

(C) Japanese Utility Model Publication No. 59-38898 When the refracting rod is made linear, the protrusion provided on one side engages with the recess provided on the other side, and the two are brought into a linear state by the spring rod. And push.

(D) Japanese Utility Model Publication No. 60-4421 When the refracting rod is linear, the pin provided on one side engages with the notch provided on the other side, and the refracting rod on the other side is provided. A leaf spring that acts as an over-center is bridged over and the bending support is elastically held in a straight state and a folded state.

(E) Japanese Utility Model Publication No. 62-44671 SUMMARY OF THE INVENTION A leaf spring is provided on a surface of one end portion of the refraction support rod which is an inner surface when refracting, and the other end portion of which is an outer surface when bending is cammed. The cam-shaped end portion elastically presses the leaf spring when the bending support is extended and folded.

[0009]

[Problems to be solved by the device]

 The typical bending support of the folding table described above has at least one or more of the following problems.

If a certain amount of force is applied during extension, it may be bent easily, which is dangerous.

[0011] Holding in the folded state is uncertain.

In addition to being difficult to operate, they are force consuming and sometimes dangerous.

In the case of using the spring, the spring force is reduced and the locking action becomes incomplete or insufficient when the spring is used for a long time.

Since the number of parts is large, it takes a lot of time to assemble and is expensive. The present invention solves all of the above-mentioned problems in the same conventional ones.

[0015]

[Means for Solving the Problems]

 According to the present invention, the bending rod that connects the middle part of the leg rod whose upper end is pivotally attached to the top plate and the bottom face of the top plate is formed in a downward U-shaped cross section and is attached to the lower part of the upper piece. A flexible handle piece is provided at the lower end of the upper piece so as to hang perpendicular to the upper piece, and an upper rod with a groove is provided on the upper side surface of the root of the handle piece. A spindle-shaped cross section having a head centered on this pivotal portion and a lower end with a tapered edge, the upper end of which is fitted into the lower end of the upper rod, and the outer peripheral surface of the head. A lower rod having an eccentric cam provided with a plurality of engaging grooves at key points, and the bending rod is linearly or double-folded as the leg rod is vertically deployed and horizontally folded. So that the engaging ridges on the upper rod fit into different engaging grooves on the eccentric cam. When the further refractive 支杆 becomes straight, tapered edge of the eccentric cam, by which is adapted to engage the grooves of the base of the handle piece, the problem is resolved.

[0016]

[Action]

 When the bending rod is extended or folded, one of the two engaging grooves on the outer circumference of the head of the eccentric cam on the lower rod engages with the engaging ridge on the upper piece of the upper rod to prevent bending. Hold the folding rod in that state.

When the bending support rod is extended, the tapered edge of the eccentric cam automatically engages with the concave groove of the base of the handle piece that is integral with the upper rod, so that the bending support rod is securely held in that state. To do.

[0018]

【Example】

 At the center of the horizontal rod (2) that connects the intermediate parts of the leg rods (1) and (1) on the front and rear sides of the folding table (right side only in the figure), and slightly inward from the side edge of the top plate (3). The lower surface is connected by a bending support rod (4). The upper ends of the leg rods (1) (1) are pivotally attached to the lower surface of the top plate (3) by a pivot shaft (1a) in the front-rear direction.

The bending support rod (4) has an upper rod (5) having a downward U-shaped cross section, and an upper rod (5) having an upper end fitted inside the lower end thereof and having a pin (6) oriented in the front-back direction. It consists of a lower rod (7) pivotally attached to 5).

The upper end of the upper rod (5) is attached to the bearing fitting (8) fixed to the bottom surface of the top plate (3), and the lower end of the lower rod (7) is the center of the inner surface of the horizontal rod (2). The bearing fittings (9) fixed to the parts are pivotally attached to the front and rear axial rods (10) and (11), respectively.

The upper piece (12) of the upper rod (5) extends slightly downward beyond the pivotal connection portion by the pin (6), and the lower surface of the lower end of the upper piece (5) depends perpendicularly to the upper piece (12). A flexible handle piece (13) is formed so as to project.

On the inner surface of the root of the handle piece (13), that is, on the surface facing the upper part of the upper rod (5), a concave groove (14) facing front and rear is formed.

An engaging projection (15) in the front-rear direction is provided on the lower surface of the upper piece (12) of the upper rod (5). The position of the engagement protrusion (15) is determined so that the engagement action described later can be exhibited.

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

The lower rod (7) is formed by integrally connecting the upper ends of the side pieces (17) and (17) with an eccentric cam (19) having a spindle-shaped cross-section with a tapered edge (18) at the lower end. Engagement grooves (20) and (21) are provided on the upper surface and the lower surface of the head (19a) of the eccentric cam (19) centering on the pin (6), respectively.

The outer peripheral surface of the upper end of the eccentric cam (19) always slides on the lower surface of the upper piece (12) of the upper rod (5) regardless of the refraction angle of the upper rod (5) and the lower rod (7). I make contact with them. The positions of the engaging grooves (20) and (21) are determined so that the operation described below can be performed.

It should be noted that in order to improve the movement of the handle piece (13), a notch (22) may be provided at an important point on the upper surface of the upper rod (5). The upper rod (5) and the lower rod (7) are preferably made of a material such as synthetic resin that is hard and relatively easy to deform.

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 to be linear, and the upper rod (5) is engaged. The ridge (15) is fitted into the engaging groove (20) in the upper end upper surface of the eccentric cam (18), and the upper rod (5) and the lower rod (7) are held in that state. Further, at this time, the concave groove (14) at the base of the handle piece (13) is fitted to the tapered edge (18) of the eccentric cam (19), and the rotation of the eccentric cam (19) is prevented.

To fold the leg rods (1) (1), first tilt the handle piece (13) outward by hand to form the groove (14) from the tapered edge (18) of the eccentric cam (19). After removing, as shown in FIG. 3, the bending support rod (4) is folded upward. Then, the upper engaging groove (20) of the eccentric cam (19) is disengaged from the engaging protrusion (15) of the upper rod (5), and the leg rods (1) (1) are folded.

As shown in FIG. 4, when the rods (5) and (7) are completely horizontal and overlap each other on the lower surface of the top plate (3), the eccentric cam (19) originally on the lower surface is overlapped. The engaging groove (21) is engaged with the engaging protrusion (15) of the upper rod (5), and both rods (5) and (7) are held in this state.

[0031]

[Effect of device]

 When the bending support rod that supports the top plate and the leg rod is linearly extended and folded horizontally, both of the engaging grooves of the eccentric cam on the lower rod are attached to the upper rod. The upper and lower rods are securely held by automatically engaging with the engaging ridges.

Moreover, when the leg rod is used vertically, the tapered edge at the lower end of the eccentric cam automatically engages with the groove provided in the base portion of the handle piece on the upper rod, so that the handle piece is As long as you do not operate it, the bending rod will not be broken and it is safe.

[Brief description of drawings]

FIG. 1 is a bottom 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 of the central portion of FIG.

FIG. 3 is a view similar to FIG. 2 while the leg rod is being folded.

FIG. 4 is a view similar to FIG. 2 in a state in which the leg rod is completely folded.

FIG. 5 is a perspective view of a bending support rod and its related components.

[Explanation of symbols]

 (1) Leg rod (1a) Axis (2) Side rod (3) Top plate (4) Bend support rod (5) Upper rod (6) Pin (7) Lower rod (8) (9) Bearing bracket (10) (11) Shaft rod (12) Upper piece (13) Handle piece (14) 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)

[Scope of utility model registration request] 1. A refraction supporting rod that connects a middle portion of a leg rod whose upper end is pivotally attached to a top plate and a lower surface of the top plate, has a downward U-shaped cross section, and is attached to a lower portion of an upper piece thereof. An upper rod provided with a mating ridge and a flexible handle piece that hangs perpendicularly to the upper piece at the lower end of the upper piece, and an upper rod having a groove on the upper side surface of the root of the handle piece, and an upper part The rod has a spindle-shaped cross section that is pivotally attached by inserting the upper end into the lower end of the rod, and that has a head centered on the pivotal portion and a lower end that is a tapered edge, and that is located at an important point on the outer peripheral surface of the head. A lower rod having an eccentric cam provided with a plurality of engaging grooves, and when the bending support rod is linearly folded or double-folded as the leg rod is vertically expanded and horizontally folded, The engaging projections on the upper rod are fitted into different engaging grooves on the eccentric cam, and A leg rod holding device in a folding table, wherein a tapered edge of the eccentric cam engages with a concave groove of a base of the handle piece when the bending support rod becomes linear.