JP2012081238A - Folding structure with wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding type structure of high durability.SOLUTION: The folding type structure includes main frames which are divided at the center and also pivotally-attached in a foldable state and bents which are pivotally-attached to the individual main frames and have each an upper cylindrical part extending in the downward direction and a lower cylindrical part capable of varying the positional relation in the vertical direction with the upper cylindrical part. The upper cylindrical part has a caster fixed in the lower portion and has a longitudinal-hole-shaped hole portion extending in the vertical direction, while the lower cylindrical part moves in the vertical direction, responding to the movement of a pin inserted into the hole portion, which is made in the vertical direction of the hole portion, and the positional relation in the vertical direction between the caster and the lower portion of the lower cylindrical part varies therewith. The pin comes into contact with the main frame and moves in the vertical direction, responding to a state of inclination of the main frame.

Description

  The present invention relates to a structure of a caster and a stand height adjusting function in a structure that has casters and stand pedestals and is divided and foldable.

  When the folding structure is folded, the caster provided on the pedestal is grounded only on the floor surface and is easily moved by sliding the caster.

  On the other hand, if it is grounded to the floor with only the casters during deployment, it will swing due to its rotation, and the folding structure cannot be supported stably. For this reason, a method has been adopted in which the foldable structure is stably supported by being grounded to the floor surface only with a stand provided on the pedestal during deployment.

  In other words, in the folding structure, the position of the caster provided on the pedestal is set lower than the position of the stand when folded, while the position of the stand is reversed when unfolded. It is set relatively lower than the position.

  Therefore, in the past, the following technical measures have been taken, as described in Japanese Utility Model Publication No. 4-49945.

  (A) A split piece that is divided into two at the center and pivotally attached so as to be folded is provided.

  (B) An outer cylinder part in which the upper end side is pivotally attached to each of the divided pieces at the position facing the lower surface and a caster is provided on the grounding side via an extending pipe part extending outwardly at the lower end side, and in the outer cylinder part A pedestal having an inner pipe portion for a stand that is inserted and slidable in the vertical direction is provided.

  (C) A double-pipe telescopic tube that hangs down from the pivot position at the center of the top plate, and a lower end pivotally attached to the inner tube of the telescopic vertical tube, and the upper end gradually tilts outward and rises toward the top plate side. Folding comprising a pair of left and right stay members pivoted and a pair of left and right link members whose inner ends are pivotally attached to the outer pipe of the telescopic vertical tube and whose outer ends are pivotally attached to the middle part of the pedestal Provide a mechanism.

  (D) An operating rod-like member is provided in which the upper end is pivotally attached to the middle portion of the stay member and the lower end is pivotally attached to the inner tube portion.

  (E) a sliding hole disposed below the staying member at the outer cylinder portion so that the operating rod-shaped member pulls up or down the inner pipe portion in the vertical direction when the top plate is folded or unfolded; Provide.

  Reality 4-49945

  However, in the foldable structure having the above-described structure, a link member that is a part of the folding mechanism and an actuating hook-like member that is interposed in the inner pipe portion that is pulled up or down in the vertical direction when folded or unfolded are provided. The structure becomes complicated.

  Therefore, there is a possibility that the sliding operation failure and the folding operation failure of the inner pipe portion for the stand may be caused by the aging deterioration of the operation hook member due to repeated use or the breakage of the operation hook member due to external impact or the like.

  In addition, there is a problem that the manufacturing process becomes complicated when commercialized.

  Accordingly, an object of the present invention is to provide a highly durable folding structure.

  A foldable structure according to the present invention includes a main frame that is divided into two at the center and pivotally attached in a foldable state, an upper cylinder portion that is pivotally attached to each main frame and extends downward, and an upper cylinder And a pedestal having a lower cylinder part capable of changing the positional relationship in the vertical direction, and the upper cylinder part has a long hole-like hole part with a caster fixed to the lower part and extending in the vertical direction. Then, in response to the vertical movement of the hole of the pin inserted in the hole, the lower cylinder moves in the vertical direction, and the vertical positional relationship between the caster and the lower part of the lower cylinder changes. The pin comes into contact with the main frame and moves up and down in accordance with the tilt state of the main frame.

  In order to solve the above-mentioned problem, the present invention is designed so that the lower cylinder part (inner cylinder pipe part) for the stand is moved up and down in conjunction with the inclination change (tilt) of the main frame when the structure is folded or unfolded. A pin that transmits the tilt change of the main frame to the lower cylinder portion in the vertical direction without using an operating hook-shaped member that transmits the tilt change of the main frame to the lower tube portion by the rotation operation in order to pull it up or down. The above-described problems are solved by using a protrusion to realize a simpler mechanism and provide a reliable operation.

  As described above, according to the present invention, in a foldable structure, when the main frame is folded or unfolded, the main frame is centered on the pivot position between the main frame and the pedestal fixed near the outer periphery of the divided piece. The inclination changes, and the pin (pin-like protrusion) and the lower cylinder part (inner cylinder pipe part) move in the vertical direction in accordance with the inclination change (elevating operation).

  By this raising / lowering operation, the lower cylinder part (inner cylinder pipe part) slides up and down within the outer cylinder pipe part by a predetermined length.

  At this time, since the lower cylinder part (inner cylinder pipe part) moves up and down in a state where the main frame and the pin are in direct contact with each other, the operation of other auxiliary parts is not required. Therefore, there is no fear of malfunction during folding or unfolding and malfunction due to vertical movement of the stand leg due to aged deterioration or damage due to external impact, and the work in the manufacturing process becomes easy.

  Furthermore, since the ground contact surfaces of the footnote and the central footnote are securely grounded in a stationary use state, the stable deployment state can be maintained without being affected by the rotation of casters or wheels.

It is the side view, front view, and top view which show the floor surface expansion | deployment state of the folding bed in this embodiment. It is a side view which shows the process which changes from a floor surface expansion | deployment state to a folding state. It is a side view which shows a pedestal, and is a figure containing the spring in a pedestal.

  A preferred embodiment of the present invention applied to a foldable bed will be described below with reference to the drawings.

  The foldable bed 1 shown in FIGS. 1 to 2 has a pair of divided pieces 2 and 3 that constitute a bed floor divided into the same shape and the same size, and floor support main frames 10 and 20. is doing.

  The main frames 10 and 20 are rotatably connected to a pivot plate 15 provided therebetween. The split pieces 2 and 3 are disposed on the main frames 10 and 20 and the pivot plate 15.

  The pivot plate 15 is provided with a central leg column 80 that hangs down. The central pedestal 80 is in contact with the grounding surface in a state where the main frames 10 and 20 are arranged in a straight line when viewed from the side (see the grounded state, see FIG. 2A).

  The split pieces 2 and 3 and the floor support main frames 10 and 20 are folded or unfolded via a folding mechanism with pivot points 16 and 17 provided on the pivot plate 15 as fulcrums.

  In the present invention, the folding mechanism includes a substantially inverted T-shaped pedestal 30 and 40 mounted on casters 50, 51 to 60, 61, and a center mounted on the pivot plate 15. It consists of a pedestal 80.

  The end of the floor support main frame 10 on the side facing the pivot plate 15 is pivotally attached to the pivot plate 15 at a pivot point 16.

  An end of the floor support main frame 20 facing the pivot plate 15 is pivotally attached to the pivot plate 15 at a pivot point 17.

  The end of the floor support main frame 10 on the side not facing the pivot plate 15 is pivotally attached at the pivot point 18 to the upper end of the pedestal 30 that extends downward.

  The end of the floor support main frame 20 on the side not facing the pivot plate 15 is pivotally attached at the pivot point 19 to the upper end of the leg column 40 extending downward.

  Further, casters 50, 51 and 60, 61 are mounted on the substantially inverted T-shaped pedestals 30, 40, respectively, and the pedestal 30, 40 slides.

  As can be seen more clearly in FIG. 3, the pedestals 30 and 40 are suspended tube portions 30A and 40A, and extended tube portions 30B and 40B extending perpendicularly from the lower ends of the suspended tube portions 30A and 40A in the outward and inward directions. It is made up of.

  The drooping tube portions 30 </ b> A and 40 </ b> A configured as described above have a double tube structure including an outer tube portion 120 and an inner tube portion 70 fitted into the outer tube portion 120.

  That is, the outer cylindrical pipe part 120 is made of a hollow cylindrical pipe material having an opening on the grounding side, and the inner cylindrical pipe part 70 is fitted into the hollow part so as to be slidable in the vertical direction.

  A shoe portion 71 that can be finely adjusted in the vertical direction is provided on the grounding side of the inner tube portion 70. That is, the pedestal column 40 is an upper tube portion (the outer tube portion 120, the extended tube portion 40B, the casters 60, 61) that does not move in the vertical direction as the pin-shaped protrusion (pin) 110 described later moves in the vertical direction. And a lower cylindrical portion (inner cylindrical tube portion 70, shoe portion 71) that moves in the vertical direction as the pin-shaped protrusion 110 moves in the vertical direction, and the pedestal 30 has the same upper and lower cylindrical portions. Consists of.

  The shoe portion 71 is made of a resin material. An adjustment screw 72 is fixed to the upper end of the shoe portion 71 and is screwed to a nut N fixed inside the lower end of the inner tube portion 70.

  Accordingly, the grounding position of the shoe portion 71 can be finely adjusted by turning the adjustment screw 72 and screwing it back and forth in the vertical direction.

  In addition, a sliding hole (a long hole-like hole extending in the vertical direction) 130 extending in the vertical direction is formed in the outer cylinder pipe portion 120 on the wall surface.

  Pin-like projections 110 for loading the main frames 10 and 20 of the folding mechanism are bonded to the inner tube portions 70 of the pedestals 30 and 40. The pin-shaped protrusion 110 moves up and down in the sliding hole 130 formed in the outer tube portion 120 in conjunction with the loaded state of the main frames 10 and 20, and moves the inner tube portion 70 up and down.

  That is, as clearly shown in FIG. 3, the pin-shaped protrusion 110 is substantially perpendicular to the upper portion of the inner tube portion 70 through the sliding hole 130 formed in the outer tube portion 120 in the shape of a long hole up and down. It is penetrated and bonded. In other words, the pin-shaped protrusion 110 is inserted into the sliding hole 130 so as to be movable in the vertical direction. The spring Z is an inner cylinder tube in which one end (upper end) is attached to the upper part of the outer cylinder pipe part 120 constituting the upper cylinder part, and the other end (lower end part) is bonded to the pin-like protrusion 110. It is attached to the upper end of the part 70.

  The positions of the pin-shaped protrusions 110 are the inside of the floor support main frame 10 in the pedestal column 30 and the upper end portion of the pedestal column 40 near the outside of the floor support main frame 20.

  That is, the pin-shaped protrusion 110 on the pedestal 30 is loaded from the inner side of the main frame 10 in accordance with the inclination change of the floor or floor support main frame 10, and the floor 40 or the floor support main frame 20 is supported on the pedestal 40. The main frame 20 is loaded from the outside (upper side) according to the inclination change.

  Accordingly, in conjunction with the folding or unfolding operation of the floor surface, the inner tube portion 70 can be moved up and down through the pin-shaped protrusions 110 on which the floor surface supporting main frames 10 and 20 are loaded, and the hanging tube portions 30A and 40A can be expanded and contracted. it can.

  On the other hand, the attachment parts of the casters 50, 51, 60, and 61 are fixed to the lower surfaces of the extension pipe parts 30B and 40B so as to be slidable.

  The casters 50, 51 and 60, 61 have a spring constant of the spring Z such that the lower end of the casters 50, 51 and 60, 61 is higher when the floor surface is deployed than the shoe portion 71 which is the lower end of the hanging pipe portions 30A, 40A. And the size and weight of each part are determined.

  1 (a) and FIG. 2 (a), when the central pedestal 80 is artificially raised through a handle or the like connected to the central pedestal, the divided piece 2 3 and the opposite ends of the floor support main frames 10, 20 open with their pivot points 16, 17 as joint points.

  When the pivot points 16, 17 exceed the horizontal positions of the pivot points 18, 19 of the pedestals 30, 40, the floor surface or the floor-supporting main frames 10, 20 are mutually connected by the elasticity of a spring (not shown). It acts in the direction of raising the opposite end, that is, the direction of folding the floor (see FIG. 2 (b)).

  Further, in connection with the folding operation of the floor surface or the floor support main frames 10 and 20, the pedestals 30 and 40 are also moved relative to each other in the approaching direction while being kept in the hanging direction, and folded up in a standing parallel manner. (See FIG. 2 (c)).

  In this folding process, the pedestals 30 and 40 slide in a direction approaching each other while maintaining the upright posture in the unfolded state as shown in FIGS. 2 (a) and 2 (b), as shown in FIG. 2 (c). Thus, an upright posture is formed even in a folded state.

  Next, the operation of the drooping pipe portions 30A and 40A will be described. In the bed unfolded state (floor surface unfolded state), the inner cylinder is interposed via the pin-shaped protrusions 110 on which the floor surface supporting main frames 10 and 20 are loaded (pressed down). Since the pipe part 70 is displaced (extends) to the lowest lowered position, the shoe part 71 is positioned lower than the casters 50, 51, 60, 61 and supports the bed by the suspended pipe parts 30A, 40A and the central pedestal 80. Will do.

  Further, a spring Z is inserted into the outer cylinder pipe part 120 constituting the drooping pipe parts 30 </ b> A and 40 </ b> A and the upper end of the inner cylinder pipe part 70. Due to the action of the spring Z, when the bed is folded, the inner tube portion 70 is automatically displaced (shortened) to the highest ascending position according to the change in the inclination of the floor support main frames 10 and 20, so that the casters 50, 51, And 60 and 61 are positioned lower than the shoe portion 71, and the casters 50 and 51 and 60 and 61 alone support the bed.

  Further, the ground tube position of the inner tube portion 70 of the hanging tube portions 30 </ b> A and 40 </ b> A is raised and lowered relative to the casters 50, 51, 60, and 61.

  Further, as soon as the floor surface starts to be folded, the shoe portion 71 rises from the grounding position, and the caster can ground and slide.

  Next, the operation and effect of this embodiment will be described in detail.

  The spring Z biases (pulls) the pin-shaped protrusion 110 so that the pin-shaped protrusion 110 moves upward.

  However, in the floor surface development state where the main frames 10 and 20 are arranged in a straight line when viewed from the side, the pin-shaped protrusion 110 and the lower cylinder portion (the inner cylinder pipe portion 70 and the shoe portion 71) are connected to the main frame 10, 20 is pushed down by its own weight, so that the shoe portion 71 becomes lower than the members constituting the upper cylindrical portion such as the casters 50 and 60, and comes into contact with (contacts with) the grounding surface. At this time, the spring Z is stretched by being pulled by the pin-shaped protrusion 110. Since the shoe part 71 is grounded, the foldable bed 1 is brought into a state where it is difficult (or does not move) on the grounding surface.

  When the user lifts the central pedestal 80 and lifts the inner portions of the main frames 10 and 20 to release the floor surface expanded state, the state of being pushed down by the main frames 10 and 20 of the pin-like protrusion 110 is released. Then, the pin-shaped protrusion 110 moves upward by the biasing force (the pulling force in the contracting direction) of the spring Z. Along with the upward movement of the pin-shaped protrusion 110, the lower cylinder part (the inner cylinder pipe part 70, the shoe part 71) also moves upward, whereby the casters 50, 51, 60, 61 constituting the upper cylinder part are It becomes lower than the shoe portion 71 and comes into contact with (grounds) the ground plane. Since the casters 50, 51, 60, and 61 are grounded, the foldable bed 1 is brought into a state (slidable state) that is easy to move on the ground surface.

  When the casters 50, 51, 60, 61 are moved so as to widen the outer portions of the main frames 10, 20 from the folded state in which the main frames 10, 20 face each other in a parallel positional relationship (see FIG. 2C). Through the state of FIG. 2 (b), the floor surface is expanded (see FIG. 2 (a)). The casters 50, 51, 60, and 61 are in contact with the ground until the floor surface is expanded, so that they can slide on the ground and change the inclination of the main frames 10 and 20. In the floor development state, since the shoe part 71 is grounded, the folding bed 1 is made difficult to move (or does not move) on the grounding surface.

  In the present embodiment, the change in the inclination of the main frames 10 and 20 is performed by switching between the grounding of the shoe portion 71 in such a floor surface deployed state and the grounding of the casters 50 and 60 in a state other than the floor surface deployed state such as a folded state. Accompanied by the pin-shaped protrusion 110 that moves in the vertical direction. Since the pin-shaped protrusion 110 is in contact with the main frames 10 and 20, the pin-shaped protrusion 110 moves directly in the vertical direction according to the inclination of the main frames 10 and 20. For this reason, it is possible to transmit a force that moves up and down with less error compared to a configuration in which a rotating member (such as an actuating rod-like member) is interposed to transmit a change in the inclination of the main frames 10 and 20 to the pin-like protrusion 110. This makes it possible to increase durability by the amount that does not require consideration of aging of such members.

  In addition, although the form which moves the pin-shaped protrusion 110 upward using the tension | pulling force of the spring Z was demonstrated, the form which moves the pin-shaped protrusion 110 upward other than the urging | biasing force of elastic bodies, such as the spring Z, is demonstrated. It may be. For example, when the pin-shaped protrusion 110 and the main frames 10 and 20 are attracted to each other by magnetic force, the pin-shaped protrusion 110 attached to the lower cylinder part (inner cylinder pipe part 70) is inclined to the main frames 10 and 20. Although the position of contact with the main frames 10 and 20 changes when the angle changes, the pin-shaped protrusions 110 are pulled up by the magnetic force, so that the contact with the main frames 10 and 20 is maintained. In this case, the biasing force of the spring Z is not required.

  Moreover, although this embodiment demonstrated using the foldable bed 1 by which a bed is arrange | positioned on a main frame as a foldable structure, other things, for example, a plate-shaped ceiling on a main frame, are demonstrated. It can also be used for a folding table on which a board is arranged and a table tennis table on which a table tennis board is arranged.

DESCRIPTION OF SYMBOLS 1 Folding bed 2, 3 Split piece 10, 20 Main frame 15 Axis plate 16, 17, 18, 19 Pivoting point 30, 40 Pedal 30A, 40A Drooping pipe part 30B, 40B Extension pipe part 31, 41 Pivoting Points 50, 51, 60, 61 Casters 70 Inner tube portion 71 Shower portion 72 Adjustment screw 80 Central pedestal 110 Pin-like protrusion 120 Outer tube portion 130 Sliding hole N Nut Z Spring

Claims (2)

A main frame that is divided into two at the center and pivotally attached in a foldable state, an upper cylinder portion that is pivotally attached to each of the main frames and extends downward, and a positional relationship between the upper cylinder portion and the vertical direction is changed. A pedestal having a lower cylinder portion that can be
A caster is fixed to the lower part of the upper cylinder part, and it has a long hole-like hole part extending in the vertical direction,
Corresponding to the vertical movement of the hole of the pin inserted in the hole, the lower cylinder moves in the vertical direction, and the vertical positional relationship between the caster and the lower part of the lower cylinder Fluctuates,
The pin is in contact with the main frame and moves up and down in response to a change in the inclination of the main frame. The upper tube portion has a spring that urges the pin to move upward,
In the floor development state where each of the main frames is arranged in a straight line when viewed from the side, the pin and the lower cylinder part are pushed down by the main frame, and the lower part of the lower cylinder part is grounded,
2. The structure according to claim 1, wherein when the floor surface development state is released, the pin and the lower cylinder portion are moved upward by an urging force of the spring, and the caster is grounded.

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