JP4514288B2 - Lock mechanism for legs such as tables - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention simplifies the configuration, reduces the number of parts, can be manufactured easily and inexpensively, and can be reduced in size and weight and homogenized, and can support a leg firmly and obtain a stable standing state. The present invention relates to a leg locking mechanism such as a table that can smoothly and stably fold and erect a leg.
[0002]
[Prior art]
A conventional mechanism of this type is configured by attaching a pair of rotating members to the upper end of a leg, forming engagement grooves in the rotating members, and four corners on the back surface of the top plate as disclosed in, for example, Japanese Patent No. 2846864. A bracket having a substantially U-shaped cross section is attached to the bracket, and the upper end of the leg is rotatably connected to the bracket, and an engaging member is rotatably supported in the bracket. And a pin that can be engaged with each other, and the engaging member is urged to turn to the rotating member side via a torsion spring, while the engaging member in the opposite bracket is connected via the connecting member. When the leg is unlocked, the connecting member is pivoted to release the engagement between the pin and the engaging groove, and the leg is folded.
[0003]
However, this conventional leg locking mechanism has a problem in that the structure is complicated, the number of parts is large, the cost is high, and the weight is increased.
[0004]
[Problems to be solved by the invention]
The present invention solves such problems, simplifies the configuration, reduces the number of parts, and can be manufactured easily and inexpensively, and can be made compact, light and uniform, and supports the legs firmly and stably. It is an object of the present invention to provide a leg locking mechanism such as a table that can obtain a standing state and can smoothly and stably fold and stand the legs.
[0005]
[Means for solving problems]
For this reason, the invention of claim 1 is provided with a reinforcing frame attached to the back surface of the top plate, a bracket attached to the end of the reinforcing frame and provided with two engaging grooves separated from each other, and rotatable to the bracket. And a leg joint that can be connected to the leg, and a locking rod that can be engaged with and disengaged from the engaging groove when the leg is standing or folded, and one side is pivoted to the upper end of the leg. A locking mechanism for a leg, such as a table , which is connected to the bracket side and is urged to turn to the bracket side, and the reinforcing frame is formed in a rectangular tube shape into which a base portion of the bracket can be inserted, and the bracket Has a pair of bracket links that can be inserted into the reinforcing frame, and a bracket plate formed between the bracket links so as to be spaced apart, and the leg joint has a prismatic shape capable of fitting a pair of connecting rods and legs. Formed with an L-shaped joint A pair of connecting rods are arranged inside the reinforcing frame, the bracket links and the bracket plates are arranged inside and outside of the connecting rods, and these are rotatably connected, while the outer peripheral surfaces of the connecting rods are orthogonal to each other. When the legs are upright, one engagement surface is arranged to engage with the inner surface of the reinforcing frame, and the other engagement surface is arranged to engage with the vertical surface inside the bracket. The leg joint is firmly and stably supported by the reinforcing frame and the bracket, and the standing posture of the leg can be formed accurately and stably .
[0006]
According to a second aspect of the present invention, the bracket plate is formed so as to protrude in the standing direction of the leg, and a locking groove into which the bracket plate can be inserted is formed in the leg joint. A bracket plate is disposed in the groove so as to be engageable so that the standing posture of the leg can be firmly and stably maintained .
According to a third aspect of the present invention, the engaging groove is provided at a separation position of the bracket plate, a tapered guide portion is formed between the engaging grooves, and the locking rod is engaged with the guide portion. It arrange | positions so that sliding is possible, and it can engage | engage a locking rod and an engaging groove smoothly and stably .
According to a fourth aspect of the present invention, the attachment is formed in a U-shaped cross section that can be engaged with the peripheral surface of the leg, and a pin is rotatably disposed on one side of the pair of side pieces. By disposing the locking rod on the side and attaching the attachment to each leg, the attachment is reduced in size and weight, and a stable engagement / disengagement operation by the locking rod is obtained.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 6, reference numeral 1 denotes a horizontally-long rectangular top plate, and a pair of reinforcing frames 2 made of square tubes in the length direction of the back surface thereof. Are spaced apart.
A screw hole 3 for mounting the frame or a bolt insertion hole and a notch groove 4 are formed on the lower surface of the end portion of the reinforcing frame 2, and a pin hole 6 into which pins 5 can be inserted on both side surfaces of the end portion of the reinforcing frame 2. The bracket 7 and the leg joint 8 are overlapped and inserted into the end of the reinforcing frame 2.
[0008]
The bracket 7 is integrally formed of a glass fiber reinforced plastic, which includes a substantially cubic base block 10 having a screw hole 9 or a bolt insertion hole, and a pair of bracket links 11, 11 projecting from the block 10. The bracket plate 12 is disposed between the links 11.
[0009]
The bracket link 11 is formed in a horizontally long plate shape, a pin hole 13 is formed at the tip thereof, and the bracket plate 12 is formed in a deformed substantially pentagonal plate shape having a considerably larger vertical width than the bracket link 11. A thick portion 14 having substantially the same thickness as the base block 10 is provided at the outer end thereof, and a downwardly tapered guide portion 12 a is formed on the lower surface of the bracket plate 12.
[0010]
A locking rod, which will be described later, is disposed in the guide portion 12a so as to be engaged and slidable. Engagement grooves 15 and 16 are formed at the ends of the bracket plate 12, that is, upper and lower ends. The locking rod can be engaged and disengaged.
In the figure, reference numeral 17 denotes a plurality of convex portions protruding in a bead shape on both side surfaces of the intermediate portion of the bracket plate 12 and are formed horizontally to each other.
[0011]
The leg joint 8 is formed into a substantially L-shaped column shape by a reinforcing plastic of the same quality as the bracket 7, and this protrudes into a pair of connecting rods 18 shorter than the bracket link 11 and a base end portion of the rod 18. It is composed of a prismatic joint rod 19 provided.
[0012]
Among these, a pin hole 33 is formed at the tip of the connecting rod 18, the connecting rod 18 is disposed between the bracket link 11 and the bracket plate 12, and the bracket plate 12 is interposed between the connecting rods 18 and 18. The connecting rods 18 and 18 are rotatably connected via the pins 5 inserted into the pin holes 33 from the outside of the reinforcing frame 2.
[0013]
A locking groove 20 that communicates with the space between the connecting rods 18, 18 is provided in the upper portion of the joint rod 19, and the bracket plate 12 can be accommodated in the groove 20. A square tubular leg 21 is inserted into the joint rod 19 and is connected via a pin 24 inserted into its pin holes 22 and 23.
In the figure, 25 is a flange portion projecting from the upper peripheral surface of the joint rod 19 and is arranged so as to be able to contact the upper end portion of the leg 21.
[0014]
An attachment 26 is attached to the upper part of the leg 21, and the attachment 26 is formed in a substantially U shape by a plastic of the same quality as the bracket 7, and a pin hole 28 is formed in a pair of side pieces 27, 27 facing each other. .
The leg 21 is accommodated between the side pieces 27, 27, the pin 24 is inserted into the pin holes 28, 23, 22, and the attachment 26 is rotatably connected to the leg 21.
[0015]
One end of a locking rod 29 made of steel pipe is inserted into the upper part of the side pieces 27, 27, and the end is formed in a substantially half-moon shaped cross section to prevent the insertion part from rotating.
The locking rod 29 is slidable and engaged with the guide portion 12a as described above, and can be engaged with and disengaged from the engaging grooves 15 and 16. That is, the locking rod 29 engages with the engaging groove 15 as shown in FIG. 4 when the leg 21 is folded, and engages with the engaging groove 16 when the leg 21 stands up as shown in FIG. Yes.
[0016]
In the figure, 30 is a spring made of a steel plate having a substantially V-shaped cross section disposed between the lower inner surface of the attachment 26 and the leg 21, one side piece being fixed to the leg 21, and the other side piece being the inner surface of the attachment 26. And is movably accommodated.
The one side piece of the spring 30 is expanded against the elasticity via the leg 21, and via the elasticity, the attachment 26 is urged so as to be rotatable about the pin 24 to the leg 21 side, The engagement between the locking rod 29 and the engagement grooves 15 and 16 is maintained, and the locked state thereof can be maintained.
[0017]
In the embodiment, the spring 30 has a substantially V-shaped cross section, but a conventional compression coil spring can also be used. In addition, in the figure, 31 is a connecting frame connecting the pair of legs 21 and 21 on the same side, 32 is a substantially bead-shaped convex portion protruding on the upper peripheral surface of the attachment 26, and when the leg 21 is folded, The top plate 1 of another table to be stacked can be placed.
[0018]
The locking mechanism for the legs such as the table configured as described above requires the bracket 7, the leg joint 8 and the attachment 26 in addition to the reinforcing frame 2 and the legs 21, all of which are integrally formed of synthetic resin and special post-processing. Therefore, they can be manufactured at low cost and uniformly, and the weight can be reduced. In addition, since the locking rod 29 is not provided with a grip portion for locking operation, the configuration is simplified accordingly.
[0019]
Next, when assembling these components, for example, the top plate 1 is placed on a work table (not shown) with the back surface facing upward, and a pair of reinforcing frames 2 are screwed in parallel along the length direction on the back surface. Then, the bracket 7 is inserted into both ends of the frame 2.
At that time, the connecting rods 18 and 18 of the leg joint 8 are inserted between the bracket link 11 and the bracket plate 12, and the leg joint 8 and the bracket 7 are inserted into the reinforcing frame 2 together.
[0020]
Then, when the base block 10 comes into contact with the end of the reinforcing frame 2, the insertion is stopped, and the pin holes 5 and 13 of the reinforcing frame 2, the bracket link 11 and the bracket plate 12 are aligned, and pins are connected to them. 5, the leg joint 8 is pivotally connected to the bracket 7 and the reinforcing frame 2, and the bracket 7 is screwed to the top plate 1.
[0021]
Thereafter, the leg 21 is inserted into the joint rod 19 of the leg joint 8, the attachment 26 into which the locking rod 29 is inserted in advance is fitted to the outer end surface of the leg 23, and the pin holes 22, 23, 28 are aligned. Then, the pins 24 may be inserted into these, and the attachment 26 may be rotatably connected to the leg joint 8 and the joint rod 19.
Thus, since there are few screwing and pinning operations in the assembly, this can be done easily and quickly.
[0022]
The assembled state is as shown in FIG. 5. When the leg 21 stands up, the locking rod 29 engages with the engaging groove 16, and the leg 21 stands up, that is, the table is used.
In this case, the upper end surfaces of the connecting rods 18, 18 of the leg joint 8 engage with the upper inner surface of the reinforcing frame 2, and the outer surfaces of the connecting rods 18, 18 orthogonal to the upper end surface are perpendicular to the base block 10. Therefore, the standing posture of the leg 21 is accurately formed and the displacement of the leg 21 to the outside is prevented.
[0023]
Further, the connecting rods 18 and 18 are supported from the inside and outside by the bracket links 11 and 11 and the bracket plate 12 as shown in FIG. 6, and prevent the displacement of the legs 21 in the plate thickness direction. The support structure of the legs 21 is strengthened.
[0024]
Moreover, the attachment 26 is urged by the elasticity of the spring 30 so as to be pivotable in the clockwise direction in FIG. 5 around the pin 24, and the locking rod 29 moves to engage with the engagement groove 16. Maintain and strengthen. Moreover, the standing rotation of the leg 21 is restricted by the engagement, and the leg 21 maintains a vertical state.
Furthermore, since the engaging groove 16 is formed in the thick portion 14 and has a wide contact area with the locking rod 29, the burden per unit area of the engaging groove 16 is reduced.
[0025]
On the other hand, when the legs 21 are folded after the table is used, the table is moved to an appropriate position and turned over, the top plate 1 is appropriately placed, the one or both legs 21 are held, and this is pushed inward. .
[0026]
If it does in this way, the leg 21 and the leg joint 8 will rotate counterclockwise on FIG. 5 centering on the pin 5 along the bracket plate 12, and will be folded smoothly and stably.
At that time, the engaging groove 20 of the leg joint 8 and the gap communicating therewith are engaged in a line contact state with the projecting portions 17 projecting on both side surfaces of the bracket plate 12, so that these are engaged in a surface contact state. The legs 21 can be folded smoothly and easily as compared with the case of combining.
[0027]
Thus, the locking rod 29 moves with the leg 21 and is pulled out of the engaging groove 16 to release the engagement, and the locking rod 29 is transferred to the guide portion 12a, and the guide portion 12a is moved from the lower side. It moves upward and is dropped into the other engagement groove 15 to engage.
[0028]
This situation is as shown in FIG. 4, where the locking rod 29 is engaged with the engagement groove 15 so that the folded state of the leg 21 is maintained, and a part of the attachment 26 is located outside the reinforcing frame 2 and the leg 21. To do.
In this case, the attachment 26 is urged by the elasticity of the spring 30 so as to be pivotable in the clockwise direction in FIG. 4 around the pin 24, and the locking rod 29 moves to engage with the engagement groove 15. Maintain and strengthen. Further, the rotation of the leg 21 is restricted by the engagement, and the leg 21 is horizontally accommodated on the reinforcing frame 2.
[0029]
When the leg 21 is folded, the convex portion 32 is positioned at the uppermost portion of the attachment 26 as shown in FIG. 4, and its upper outer edge engages with the guide portion 12a, so that one end of the attachment 26 is attached. I support it.
Therefore, the top plate 1 of another table can be placed on the four convex portions 32, and the tables can be stacked.
[0030]
On the other hand, when using a table in a storage state in which the legs 21 are folded, the table is moved to an appropriate position, the top plate 1 is appropriately placed on the place, and one or both legs 21 are held and pulled up.
If it does in this way, leg 21 and leg joint 8 will rotate clockwise in Drawing 4 centering on pin 5 along bracket plate 12, and leg 21 will stand up and rotate smoothly and stably.
[0031]
At that time, the engaging groove 20 of the leg joint 8 and the gap communicating therewith are engaged in a line contact state with the projecting portions 17 projecting on both side surfaces of the bracket plate 12, so that these are engaged in a surface contact state. The legs 21 stand up smoothly and easily as compared with the case where they are combined.
[0032]
In this way, when the leg 21 is turned upright, the attachment 26 moves along with the leg 21, and the locking rod 29 is pulled out from the engagement groove 15 to release the engagement.
Then, the locking rod 29 moves from the engaging groove 15 to the guide portion 12a, moves the guide portion 12a from the upper side to the lower side, and is dropped into the other engaging groove 16.
[0033]
This situation is as shown in FIG. 5, and the locking rod 29 is engaged with the engagement groove 16, and the standing state of the leg 21 is maintained. After that, the intended use state can be obtained by inverting the table and installing the legs 21 on the floor.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the reinforcing frame is formed in a rectangular tube shape into which the base portion of the bracket can be inserted, and the bracket is spaced between the pair of bracket links insertable into the reinforcing frame and the bracket links. The leg joint is formed in an L shape by a pair of connecting rods and a prismatic joint rod capable of fitting the legs, and a pair of connecting rods is provided inside the reinforcing frame. The bracket link and the bracket plate are arranged inside and outside of the connecting rod, and these are rotatably connected, while the outer peripheral surface of the connecting rod is formed as an orthogonal engaging surface, Since one engaging surface is arranged to be able to engage with the inner surface of the reinforcing frame and the other engaging surface is arranged to be able to engage with the vertical surface inside the bracket, the leg joint is connected by the reinforcing frame and the bracket. Can be supported firmly and stably, and Orientation can be formed accurately and stably.
[0035]
According to a second aspect of the present invention, the bracket plate is formed so as to protrude in the standing direction of the leg, and a locking groove into which the bracket plate can be inserted is formed in the leg joint. Since the bracket plate is disposed in the groove so as to be engageable, the standing posture of the leg can be held firmly and stably.
According to a third aspect of the present invention, the engaging groove is provided at a separation position of the bracket plate, a tapered guide portion is formed between the engaging grooves, and the locking rod is engaged with the guide portion. because was slidably disposed, it is engaged match Rukoto a locking rod and the engaging groove smoothly and stably.
According to a fourth aspect of the present invention, the attachment is formed in a U-shaped cross section that can be engaged with the peripheral surface of the leg, and a pin is rotatably disposed on one side of the pair of side pieces. Since the locking rod is arranged on the side, by attaching the attachment to each leg, the attachment can be reduced in size and weight, and a stable engagement / disengagement operation by the locking rod can be obtained .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention, showing a situation after a leg standing operation.
FIG. 2 is a perspective view showing an assembled state of a bracket and an attachment applied to the present invention.
FIG. 3 is an exploded perspective view showing a main part of the present invention.
FIG. 4 is a front view showing a folded state of legs according to the present invention.
FIG. 5 is a front view showing a leg standing state according to the present invention.
6 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
1 Top plate 7 Bracket 8 Leg joint 12a Guide portions 15, 16 Engaging groove 21 Leg 26 Attachment 29 Locking rod

Claims (4)

A reinforcing frame attached to the back surface of the top plate, a bracket attached to the end of the reinforcing frame and having two engaging grooves separated from each other, a pivotally connected to the bracket, and a leg can be connected The leg joint has a locking rod that can be engaged with and disengaged from the engaging groove when the leg is standing or folded, and one side part is rotatably connected to the upper end part of the leg, and is turned to the bracket side. In a leg locking mechanism such as a table provided with a movably attached attachment, the reinforcing frame is formed in a rectangular tube shape into which a base portion of the bracket can be inserted, and the bracket is a pair of brackets that can be inserted into the reinforcing frame A link plate and a bracket plate formed between the bracket links, and the leg joint is formed in an L shape by a pair of connecting rods and a prismatic joint rod capable of fitting the legs. A pair of connecting rods inside the reinforcing frame The bracket link and the bracket plate are arranged inside and outside of the connecting rod, and these are rotatably connected, while the outer peripheral surface of the connecting rod is formed as an orthogonal engagement surface, One of the engaging surfaces is disposed so as to be engageable with the inner surface of the reinforcing frame and the other engaging surface is disposed so as to be engageable with the vertical inner surface of the bracket when standing up. Lock mechanism. The bracket plate is formed so as to protrude in the standing direction of the leg, and a locking groove into which the bracket plate can be inserted is formed in the leg joint, and the bracket plate is inserted into the locking groove when the leg stands. The locking mechanism for a leg of a table or the like according to claim 1, wherein the locking mechanism is arranged to be engageable . The engagement groove is provided at a separation position of the bracket plate, a tapered guide portion is formed between the engagement grooves, and the locking rod is disposed in the guide portion so as to be engaged and slidable. A locking mechanism for a leg of a table or the like according to Item 1. The attachment is formed in a U-shaped cross section that can be engaged with the peripheral surface of the leg, a pin is rotatably disposed on one side of the pair of side pieces, and the locking rod is provided on the other side of the side pieces. A locking mechanism for a leg of a table or the like according to claim 1 disposed .

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