JP4778825B2 - Locking device for furniture with folding legs - Google Patents

Description

  The present invention relates to a foldable leg locking device for furniture such as a table used in a facility for children such as a kindergarten, a nursery school, and an elementary school, particularly a furniture having a top plate.

  2. Description of the Related Art Conventionally, furniture folding leg locking devices disclosed in Japanese Utility Model Publication No. 61-32507 are disclosed. This belongs to the applicant of the present application and extends to production and sales.

  As shown in FIGS. 7 and 8, in this conventional product, a pair of U-shaped legs 11a is rotatably attached to the end of the back surface of the top plate a, and the respective ends of the hanger-like support rod 20a are connected to the U-shaped legs 11a. The U-shaped leg 11a is pivotally mounted in the middle, and when the U-shaped leg 11a is turned down, the top 2a of the support is locked by a second receiving portion 5a 'formed at the end of the elongated plate 4a. When the leg 11a stands, the U-shaped leg 11a is rotated in the direction of the outer end of the top plate 1a.

  For this reason, the top part 2a of the support rod 20a slides in the elongate plate 4a in contact with the top plate 1a in the end direction of the top plate 1a and is locked to the first receiving portion 5a. Immediately before the first receiving portion, a lever 6a with a handle made of a thick plate-like metal piece is positioned in the elongated plate 4a as will be described later, and the top portion of the support rod 20a is urged by the urging force of the lever 6a. 2a is locked and the standing state of the U-shaped leg 11a is maintained.

  Specifically, a mountain having a convex arc-shaped exclusion oblique edge 61a and a convex arc-shaped locking oblique edge 61b connected to one end of a lever 6a made of a single metal plate piece of a thick plate shape (specific example, 5 mm). A locking piece a having a shape is formed, and a handle 6a is integrally formed behind the locking piece a. Further, the end of the handle 6a bulges in the same direction as the locking piece a and is further engaged with the horizontal axis b. The front of the stop piece a is rotatably provided, and the locking piece a is normally protruded to the upper side of the passage 3a by the coil spring, and when each U-shaped leg 11a stands up by the coil spring, the locking slope edge 61b is interposed. The top portion 2a of the support rod 20a is pressed against the first receiving portion 5a side, and the bulging end portion c of the lever 6a is pressed against the top plate 1a so that the entire locking piece a is submerged from the passage 3a when the handle 6a is pulled down. To form.

  As can be seen from the above description, in this conventional example, when the U-shaped leg 11a is laid down, as shown by the arrow in FIG. 7, the handle 6a is rotated downward with one hand and the U-shaped leg is moved with the other hand. Is turned toward the inside of the top board. That is, while the handle 6a is rotated clockwise, the U-shaped leg 11a is also required to be rotated clockwise by the other hand, and the locking device at any position is the same as the handle 6a and the U-shaped leg 11a. It is necessary to rotate in the direction.

  By the way, in order to erect the U-shaped leg 11a in the prone state, it is only necessary to rotate the U-shaped leg 11a toward the outer end of the top plate 1a, and the top portion 2a of the sliding support 20a is removed from the lever. The slanted edge 61a passes against the spring pressure and is locked to the first receiving portion 5a. After passing through the support top 2a, the lever 6a is restored to the passage 3a of the elongated plate 4a by the restoring force of the spring. The upright state of the support rod 20a and the U-shaped leg 11a is maintained.

Japanese Utility Model Publication No. 61-32507

  First, when the standing U-shaped leg 11a is laid down as in the prior art, it is difficult to rotate the handle lever 6a and the U-shaped leg 11a of the locking device in the same direction. This is a young woman (kindergarten) that imposes a confidentiality obligation on the above-mentioned conventional product and the prototype of the present application in which the handle (specifically the U-shaped leg) that supports the handle and the top plate rotates in the opposite direction. It is clear from the fact that when the 30 people were operated, the latter responded that the latter was easier to work with.

  Secondly, in order to form a handle lever made of a thick steel plate as in the prior art, it is timely and economically efficient to pull it out by ordinary pressing. Specifically, the thickness of the handle lever is required to be at least 5 mm in order to maintain the standing state of the leg, and this can be pulled out in 30 seconds per unit by a normal press.

  However, as shown in FIG. 6A, when the thickness is 5 mm, the peripheral edge is not formed horizontally, and a distance L1, specifically, a difference of 0.3 mm is generated, so-called point contact is generated, and the folding frequency is high. (For example, a nursery that folds 2-3 times every day) In the facility, both the lever 6a and the top of the support 2a wear out in about 2 to 3 years, and there is no obstacle when the U-shaped leg 11a stands up, but the support 20a slides. Raises when moving.

  If formed by laser processing, the peripheral edge can be made horizontal, but it takes 2 minutes per piece and is too expensive to compare with a press.

  Thirdly, when the U-shaped leg 11a of the conventional example is erected, the lever 6a and the support top 2a are locked at one place, and it is assumed that there is a problem in terms of durability due to aging.

  It is an object of the present invention to eliminate the above-mentioned drawbacks, to make it easy to manufacture, and to avoid the danger of pinching fingers.

  First, in the present invention, a rail having a passage through which a support top slides between the top and the top plate is formed in a U-shaped cross section, and first and second engagements of the support top are formed at both ends of the passage. A stop portion is formed, and a lever having a U-shaped cross section is fitted around the outer end of the rail and is pivotally mounted, and the lever is normally urged in the closing direction, A slanted edge that is eliminated from the inward end by the top of the support shaft is formed in a convex arc shape, and the insertion groove of the top of the support shaft is recessed at a position that is continuous with the convex arc portion and corresponds to the first locking portion. The outer end of the bottom plate of the lever is extended to form a pressing piece.

  Second, the present invention provides the first coil spring according to the first invention, wherein the lever is pivotally attached to the rail via a pivot shaft, and the first coil spring is wound around the pivot shaft. Thus, the lever is normally biased in the closing direction.

  Thirdly, according to the first aspect of the present invention, a latching shaft is attached to both side plates of the rail and in the vicinity of the inward end, and the second coil spring is wound around the latching shaft and the second coil spring is wound thereon. One end is extended from the position of a 2nd latching | locking part, and it bends in a mountain shape.

  Fourthly, according to the present invention, in the first invention, both side plates of the rail are bent at right angles from the rail lower surface plate, and both ends of the both side plates are bent outwardly, and mounting pieces having screw insertion holes are provided. It is characterized by this.

  Fifth, the present invention is characterized in that, in the first invention, the first and second defense pieces are provided at both ends of the rail.

  Sixth, the present invention is characterized in that, in the fifth invention, the first defense piece is bent inward from both side plates and the second defense piece is bent upward from the bottom plate. It is.

  According to the first aspect of the present invention, when the support leg in the standing state is to be laid down, as shown in FIG. 5, the holding plate of the lever is pushed with one hand and the support leg is rotated in the folding direction with the other hand, that is, the lever And the supporting leg can be rotated in the opposite directions, and the folding operation can be performed very easily as described in the above section.

  Moreover, since the convex arc part of a lever becomes two places spaced apart as shown in FIG. 4, the thickness per piece can be formed with a thin plate rather than a prior art example (refer FIG.6 (b)), The peripheral edge of each convex arc part can be formed horizontally by press work (confirmed at the prototype stage), so-called line contact is made, and both the lever and the top of the support are less likely to wear. In addition, since the press working is possible, the lever can be manufactured easily and inexpensively.

  In addition, because the U-shaped lever is externally fitted to the U-shaped rail, the top of the support will be locked with a pair of spaced double plates, a total of four. Durability is great.

  According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the lever is normally urged in the closing direction by the coil spring, and the support leg can be reliably held upright.

  According to the third aspect of the present invention, in addition to the effects of the first aspect of the present invention, the support member at the time of overturning is locked from the front and rear by the second locking portion and the mountain portion of the coil spring by an extremely easy and inexpensive means. It is possible to maintain the prone state of the support leg with certainty.

  According to the fourth aspect of the invention, in addition to the effects of the first aspect of the invention, it is possible to easily and inexpensively manufacture the attachment piece integrally by bending with a press.

  According to the fifth invention, in addition to the effect of the first invention, there is no possibility that the user at the use site will pinch fingers from the front and back of the lock device during the erection work and foreign matter will be mixed in.

  According to the sixth invention, in addition to the fifth invention, the first and second protective pieces can be integrally formed by bending by pressing, and can be manufactured easily, quickly and inexpensively.

  The locking device shown in FIGS. 1 and 2 includes a rail 4 and a lever 6, both of which are made of a thin steel plate having a thickness of 1.5 mm to 2.5 mm.

  As shown in FIGS. 1 and 2, the rail 4 is formed in a U-shaped cross-section by bending the long side edges of the bottom plate 46 made of an elongated plate at a right angle, and both ends of both side plates 40, 40 are outward and perpendicular to each other. The mounting pieces 41, 41, 42, 42 are formed by bending them into holes, and screw insertion holes 43, 43,.

  The inward end of the bottom plate 46 is bent upward and at a right angle to form a second protective piece 45, and the outward ends of the side plates 40, 40 are bent inward and at a right angle to form the first protective piece 44, 44. To do.

  A pin 91 is attached to each inner side of both side plates 40, 40, a second coil spring 9 is wound around each pin 91, one end of the coil spring 9 abuts on the second defense piece 45, and the other end is formed in a convex arc shape. The peak portion 90 is normally formed, and the top portion of the peak portion 90 protrudes into a passage 3 described later, and the bottom portion 93 is biased so as to be positioned below the upper ends of the side plates 40, 40.

  A substantially semicircular first locking portion 5 and a second locking portion 5 ′ are recessed in the vicinity of both ends of each side plate 40, and an insertion hole 47 is formed further outward of each first locking portion 5. To do.

  Both side plates 60 are formed by bending both longitudinal ends of the lower surface plate 63 of the lever 6 upward and at a right angle. Further, the outer end of the lower surface plate 63 is extended substantially horizontally to form a donut-shaped pressing piece 64, and the pressing plate 64 is covered with a plastic 64 '.

  As shown in FIGS. 1 and 3, the entire side plate 60 is formed in an approximately mountain shape, and the oblique edges that are excluded from the inward ends of the upper edge portions 60a by the support top portions 2 described later are formed into a convex arc shape. A portion 61 is formed. A substantially semicircular insertion groove 62 is recessed at a position corresponding to the first locking portion 5 while continuing downward from the top of the convex portion 61.

  A horizontal top is continuously provided from the upper end of each insertion groove 62 and a downward sloping side 65 is formed toward the vicinity of the base of the presser piece 64.

  An insertion hole for the rotating shaft 7 is formed in the vicinity of each descending oblique side 65.

  A lever 6 having a U-shaped cross section is fitted on the rear side of the rail 4 having a U-shaped cross section, the rotating shaft 7 is inserted into each insertion hole and passed to both side plates 60, 40, and each shaft end 7 'is connected to each side. Attached to the side plate 40, the lever 6 is rotatable about the rotation shaft 7.

  The first coil spring 8 is wound around the rotating shaft 7, the end of the coil spring 8 is extended to the first defense piece side, and the other end is brought into contact with the lower surface plate 46 to normally bias the lever 6 in the closing direction. To do.

  Next, a method for attaching the locking device to the top plate 1 will be described. A steel rod is hanger-shaped to form a support 20, and the top 2 of the support is shown in a plan view as shown by phantom lines in FIG. 5 is placed on both side plates 40, 40, and wood screws 43a shown in FIG. 5 are inserted into the screw insertion holes 43 and screwed to the top plate 1 of the table.

  On the other hand, in the vicinity of both ends of the back surface of the top plate 1, support legs 11, 11 with caps formed in a substantially U shape are rotatably attached by bearings 12 or hinges not shown. Then, both ends 21 and 21 of the support frame 20 are pivotally attached to the support legs 11 and 11.

  Next, the usage and operation of the table leg as an embodiment will be explained. When the support leg 11 lying down shown in FIG. 1 starts to slide along the back surface of 1 and climbs over the mountain-shaped portion 90 in a virtual state position against the spring pressure of the second coil spring 9 shown in FIG. Thereafter, the second coil spring 9 restores the chevron 90 to the solid line position by its restoring force. Further, the support top 2 continues to slide through the passage 3 formed between the back surface of the top plate 1 and both side plates 40, 40, and then resists the spring pressure of the convex arc 61 as shown in FIGS. Then, the convex arc portion 61 is excluded from the passage 3 as indicated by a virtual line and reaches the top of the convex arc portion 61.

  After passing the top of the convex arc portion 61, the lever 6 is restored to the solid line position by the restoring force of the first coil spring 8, the support top portion 2 is externally fitted into the fitting groove 62, and the support leg 11 shown in FIG. To do.

  Next, the folding method and operation of the standing support leg 11 will be described. The presser piece 64 shown in FIG. 5 is pushed with one finger of one hand. As a result, the lever 6 rotates counterclockwise about the rotation shaft 7 as shown in FIG. 3, and the fitting groove 62 is disengaged from the support top 2 to release the lock.

  If the support leg 11 is grasped with the other hand simultaneously with the operation of pressing the presser piece 64 and rotated clockwise in FIG. 5, the support top 2 slides inward in the passage 3 and the lever 6 is restored to the solid line position by the restoring force of the first coil spring 8.

  Thereafter, if the support leg 11 continues to be pushed down, the chevron portion 90 protruding into the passage 3 is removed from the passage 3 and is retained by the second retaining portion 5 ′. The support leg 11 is completely folded by the pressure and the support leg 11 is completely folded, and the support portion 2 does not naturally move outward due to the mountain-shaped portion 90.

  As described above, it is easy to work because the direction in which the support legs 11 are lowered and the direction of rotation of the lever 6 are reversed, and other effects are also described in the column of effects. It is.

It is the perspective view which looked at the locking device of the present invention from the lower part. It is the perspective view seen from the upper direction same as the above. It is a partially cutaway side view same as the above. It is AA sectional drawing. It is a perspective view of the state which attached this invention to the table. It is a comparison schematic diagram by the plate | board thickness difference of the lever of this invention example and a prior art example. It is a perspective view which shows a part of prior art example. It is an expanded sectional view which shows the effect | action of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top plate 2 Top part 3 Passing path 4 Rail 5 1st latching | locking part 5 '2nd latching | locking part 6 Lever 7 Rotating shaft 8 1st coil spring 9 2nd coil spring 40 Side plate 41 Attachment piece 42 Attachment piece 43 Screw insertion hole 44 1st defense piece 45 2nd defense piece 46 Lower surface plate 60 Side plate 61 Convex arc part 62 Insertion groove 63 Lower surface plate 64 Pressing piece 90 Mountain part

Claims (6)

A rail having a passage through which the top of the support slides between the top plate is formed in a U-shaped cross section, and first and second locking portions of the top of the support are formed at both ends of the passage, A lever having a U-shaped cross section is fitted on the rail in the vicinity of the outward end of the rail and is pivotably mounted. In addition, the lever is normally biased in the closing direction, and the support is supported from the inward ends of both side plates of the lever. A beveled edge that is eliminated by the top portion is formed in a convex arc shape, and the insertion groove of the top portion of the support is recessed at a position that is continuous with the convex arc portion and corresponds to the first locking portion, A furniture locking device with folding legs, characterized in that a pressing piece is formed by extending an outer end of a face plate. A lever is pivotally attached to the rail via a pivot shaft, and a first coil spring is wound around the pivot shaft, and the lever is normally biased in the closing direction by the first coil spring. The furniture locking device with a folding leg according to claim 1. A latching shaft is attached to both sides of the rail and in the vicinity of the inward end. A second coil spring is wound around the latching shaft and one end of the second coil spring extends from the position of the second locking portion. The furniture locking device with folding legs according to claim 1, wherein the furniture locking device is folded into a mountain shape. 2. The furniture with folding legs according to claim 1, wherein both side plates of the rail are bent at a right angle from the rail bottom surface plate, and both ends of the both side plates are bent outwardly to be provided with attachment pieces having screw insertion holes. Locking device. 2. The furniture locking device with folding legs according to claim 1, wherein first and second protection pieces are provided at both ends of the rail. 6. The furniture locking device with folding legs according to claim 5, wherein the first defense piece is bent inward from both side plates, and the second defense piece is bent upward from the bottom plate.

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