JP2999437B2 - desk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desk, and more particularly, to a device for elevating and lowering a top plate which can be kept in a compact shape as a single unit. It relates to improvement of a structure that can be assembled.

[0002]

2. Description of the Related Art Heretofore, there has been known a learning desk which employs a structure capable of adjusting the height of a top board according to the growth of a child using the desk. For example, as shown in Japanese Utility Model Publication No. Sho 58-35079, the height of the top plate is adjusted by a rotating member provided at a central portion on the back side of the top plate and an arm extending radially around the rotating member. A plurality of link mechanisms, a leg member connected to the distal end side of each link mechanism and provided so as to be capable of extending and contracting in an axial direction, and a plan view schematic that supports and covers the rotating member and the link mechanism. And an X-shaped case.

[0003]

However, in such a configuration, the entire unit for elevating and lowering the top plate becomes bulky in the shape when final assembly is performed, that is, an X-shape. Even if the knock-down method is adopted, there is a disadvantage that the transportation cost is greatly increased. Of course, desks of the type described above have the property that skilled workers can assemble them up to the final product shape at the manufacturing plant in order to maintain constant assembly accuracy, and the desk It is hard to say that it has the suitability to assemble with the lifting device.

[0004] Therefore, a link mechanism or the like corresponding to each leg member may be individually unitized and provided independently, and these units may be assembled on the top plate side at the introduction destination of the desk. Assembling such that each leg member performs an equally synchronized elevating operation by the rotation operation of a single rotating member not only requires extremely skill, but also causes an inconvenience that an operation error or the like easily occurs due to an assembly error. In particular, in the case of a knock-down type desk, it is extremely difficult to keep the assembly accuracy constant since the delivery company of the product may perform assembly.

[0005]

SUMMARY OF THE INVENTION The present invention has been devised in view of such inconveniences, and its purpose is to enable the entire apparatus for elevating and lowering the top plate to be completed as a single unit. , While it can be displaced into a compact shape suitable for packing before being assembled on the top plate, the fixing work on the top plate is always constant by only slightly displacing the relative positions of the parts during assembly It is an object of the present invention to provide a desk that can be easily and quickly performed with high accuracy.

Another object of the present invention is to provide a desk which is free from unpleasant noise such as rattling and mechanical friction noise which may occur between components such as gears for transmitting driving force.

[0007]

In order to achieve the above object, the present invention provides a desk provided with a top plate and a lifting device capable of displacing the height of the top plate. A rotating member arranged on the back side of the plate, and a plurality of sets arranged on each of the left and right sides with respect to the rotating member, and a link mechanism capable of performing a link operation by rotation of the rotating member;
A leg member connected to each of the distal ends of these link mechanisms and having an axial length extendable and contractable by the link operation of the link mechanism; , And each of the link mechanisms is supported and fixed to the top plate.
And a second support member connected to the support member so as to be relatively rotatable in a substantially horizontal direction.
According to such a configuration, the second support provided for each link mechanism is rotatable with respect to the first support. The sets of supports can be minimized by being substantially parallel to each other, and the overall shape of the elevating device can be made substantially gate-shaped and suitable for transportation. Further, it is possible to fix the support to the back surface of the top plate simply by displacing the distal end side of the support member supporting the link mechanism in a direction away from each other, and it is possible to complete the assembly of the entire desk very easily. It is possible to provide a desk having knockdown aptitude that does not require skill.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the desk of the present invention, the first support and the second support are connected to each other in a partially overlapped state, and a mating surface of the overlapped support is provided. An adjustment member that can tighten and fix the inside is provided,
When the adjusting member is loosened, the first and second supports rotate relative to each other, and when the adjusting member is tightened, the connection position of the first and second supports is fixed. Has been adopted. With this configuration, the positional relationship between the supports can be stably maintained, and mechanical malfunctions and the like can be prevented. At this time, the adjusting member is constituted by a screw penetrating from the first support to the second support, and a nut member screwed to the screw to tighten the first and second supports. It is preferable to provide a slot hole for determining the relative rotation range of each support on the side of the support.

The rotating member is constituted by a main driving gear, while the link mechanism is constituted by a driven gear meshing with the main driving gear, a rotating plate disposed at an upper end of the axis of the leg member, and a driven gear and a rotating plate. In addition, an arm extending over the eccentric position is provided, and a tooth tip region of one of the driving gear and the driven gear is coated with a resin. Since the force for raising and lowering the tabletop can be transmitted by the gear, the tabletop can be raised and lowered with a relatively easy operation force. At this time, by forming a resin-coated surface on one of the gears, it is possible to correct a precision error of the gears, and it is possible to easily realize a synchronized elevating operation of each leg member. In addition, since direct contact between the gears can be avoided, unpleasant mechanical noise does not occur.

Further, the second support comprises an inner case extending along the direction in which the arm extends, and an outer case fixed to the top plate in a state in which the distal end of the inner case is received. The leg member is an outer cylinder suspended substantially vertically downward from the bottom of the outer case, an inner cylinder arranged in the outer cylinder and provided so as to be relatively movable in the axial direction, and is positioned and rotated in the inner cylinder. A configuration is also adopted that includes a restricted nut member and a rotating shaft that is screw-engaged with the nut member, and a rotating plate of the link mechanism is pivotally supported on an upper end side of the rotating shaft. With this configuration, since the second support is of a two-part type, the leg member side may be preassembled in the outer case, and the distal end side of the inner cover may be received in the outer case. In addition to being able to assemble the member side with a certain degree of accuracy, it is very easy to connect the arms and the like that constitute the link mechanism.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a desk according to the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of a desk according to the present embodiment, and FIG. 2 is a front view thereof. In these figures, the desk 10 is provided with a main top plate 11 having a planar concave portion at one end edge and an outer shape corresponding to the concave shape, and is flush with the main top plate 11 via a bracket (not shown). Alternatively, it is configured to include an auxiliary top plate 12 connected in a stepwise manner, and an elevating device 13 located on the back side of the main top plate 11 and supporting the same.

As shown in FIGS. 3 to 5, the lifting device 13 includes a metal driving gear 15 as a rotating member disposed on the back side of the main top plate 11, and the driving gear 15.
Link mechanism 1 arranged on each of the two left and right sides in FIG.
8, a leg member 20 connected to the distal end side of each link mechanism 18 so as to be capable of extending and contracting in the axial direction, a first support body 22 that supports and covers the driving gear 15,
And a second support member 23 that supports and covers each link mechanism 18.

The driving gear 15 is fixed to a rotating shaft 25 that passes through a substantially central portion of the first support 22. One end of an arm member 26 is fixed to the lower end side of the rotating shaft 25, and an operation handle 27 is fixed to the other end of the arm member 26. The rotation of the operation handle 27 causes the main driving gear 15 to rotate. It is provided rotatably. Here, the tooth tip region of the driving gear 15 is coated with a resin material made of urethane or the like having a cushioning property. This coating can be performed by an insert molding method in which the driving gear 15 is set in a molding die and resin is secondarily injected.

The first support 22 is provided with a link mechanism 18.
The flange surface 29 formed on the upper edge of the upper surface is fixed to the back surface of the main top plate 11 with screws 30 so as not to hinder the extension of the main top plate 11.

As shown in FIG. 5, the link mechanism 18 is provided with a driven gear 33 having a smaller diameter than the driving gear 15 and meshing with the driving gear 15;
3 and a rotating plate 37 disposed on the tip side (the left side in FIG. 5) of the second support member 23, and between the eccentric positions of the driven gear 33 and the rotating plate 37. And an arm 38 pivotally connected. Here, the second support 2 supporting the link mechanism 18
3 is an inner case 23A that is open at both ends along the extending direction of the arm 38 and has an upward U-shaped substantially culvert shape, and an outer case 23B that receives and supports the distal end side of the inner case 23A. It consists of. Inner case 2
3A has a flange surface portion 40 formed on an upper edge thereof, and a portion near the driven gear 33 is fixed to the main top plate 11 by screws 41 (see FIG. 3). On the other hand, the outer case 23B is
The 3A side is opened to form a shape having a flange surface portion 42 on the upper edge, and the flange surface portion 42 is fixed near a corner of the main top plate 11 by a screw 43.

As shown by a dotted line in FIG. 3, a protruding shaft 47 directed toward the arm 38 is provided at the bottom of the inner case 23A, and the protruding shaft 47 is inserted into and engaged with the protruding shaft 47. A matching slit hole 49 is formed along the direction in which the arm 38 extends, so that the arm 38 can move in the axial direction while maintaining the engagement state with the projecting shaft 47. Further, as shown in FIG. 5, an adjusting member for fixing the first support 22 and the inner case 23A forming the second support 23 to each other by closely adhering them to each other in the mating surface area. 50 are provided.

The adjusting member 50 includes a screw 52 inserted from the lower surface side of the first support 22 and extending through the inner case 23A. The adjusting member 50 is screwed to the screw 52 to connect the first support 22 to the inner case 23. And a nut member 53 for tightly fixing the 23A. Here, in the inner case 23A, the hole through which the screw 52 penetrates is formed as a slit hole 55 as shown in FIG. 3, and when the tightening of the adjustment member 50 is released, the area of the slit hole 55 is reduced. Inside, the inner case 23A is rotatable relative to the first support 22. In addition, the slit hole 55 is provided in the main top plate 1.
3 and a length corresponding to an angle range from a position where the leg member 20 is fixed to the position 1 to a position indicated by a two-dot chain line in FIG. 3.

As shown in FIGS. 5 and 6, the leg member 20 has an outer cylinder 60 suspended substantially vertically from a bottom 58 of the outer case 23B, and a shaft disposed in the outer cylinder 60. Cylinder 61 provided so as to be relatively movable in a direction, and a nut member 63 positioned within the cylinder 61 and restricted in rotation.
And a screw shaft 64 as a rotation shaft which is screw-engaged with the nut member 63, and a rotation plate 37 constituting the link mechanism 18 is fixed to an upper end side of the screw shaft 64. Here, in the upper region of the inner cylinder 60, stepped vertical holes 66 are respectively formed at two positions on the outer peripheral surface passing through the center of the inner cylinder, and the vertical holes 66, 66 are provided between the vertical holes 66, 66. A rotation restricting member 67 is fixedly engaged with the hole 66 and provided. The rotation restricting member 67 includes a pair of left and right U-shaped pieces 67A, 67A and a connecting piece 67B that connects the U-shaped pieces 67A to each other. The nut member 63
Are housed in a non-rotatable manner. A screw hole 71 (see FIG. 5) extending in the vertical direction is formed in the center of the nut member 63, and the screw shaft 64 penetrates the screw hole 71 and is screwed thereto. Therefore, although the arm 38 of the link mechanism 18 reciprocates in the axial direction and the rotational force is transmitted to the screw shaft 64, the rotation of the nut member 63 is restricted.
The screw shaft 64 acts to move up and down with respect to the inner cylinder 61, whereby the outer cylinder 60 can move up and down on the inner cylinder 61. At the lower end of the inner cylinder 61, a caster 70 for permitting movement of the entire desk 10 and for adjusting clearance with the floor is mounted.

Next, a procedure for assembling the desk 10 according to the above embodiment will be described.

First, the driving gear 15 and the operating handle 27 are assembled on the first support 22. Then, while the inner case 23 </ b> A of the second support 23 is connected to the first support 22, the driven gear 3
3 are respectively supported. At this time, the screw 52 of the adjustment member 50 penetrating the first support 22 and the inner case 23A
May be set gently with respect to the nut member 53. On the other hand, the leg member 20 is connected to the outer case 23 </ b> B of the second support 23 while separately assembling the leg member 20.

Next, the lifting device 13 is assembled as a unit by hanging the arm 38 between the driven gear 33 and the rotating plate 37 supported by the inner case 23A and the outer case 23B and integrating the whole. Can be.

In this state, since the screw 52 of the adjusting member 50 is rotatable in the area of the slit 55 with respect to the first support 22, the second support 23 The two second supports 23 on one side to be supported can be packed so as to be parallel to each other, that is, in such a shape that the whole forms a portal frame. This state can be maintained until the desk 10 needs to be assembled.

At the time of assembling the desk 10, the main support 11 is rotated by a predetermined angle in a direction separating the second support members 23 supporting the two sets of link mechanisms 18 from each other.
Position the entire lifting device 13 at a fixed position on the back side of
The flange surfaces 29, 40, 42 of the first and second supports 22, 23 may be fixed to the main top plate 11 by tightening the screws 30, 41, 43.

After the fixing of the elevating device 13 is completed in this way, the screw 52 of the adjusting member 50 is tightened to fix the first support 22 and the inner case 23A so that they cannot rotate relative to each other.

In the lifting device 13 having the above-described configuration, the main drive gear 15 is rotated by rotating the operation handle 27, and at the same time, the driven gears 33 meshing with the main drive gear 15 are rotated. The driven gear 33 and the rotating plate 37
Since the arm 38 is connected to each of the eccentric positions, the rotational force is transmitted to the rotating plate 37.
When the screw shaft 64 is rotated by the rotation of the rotating plate 37, the nut member 63 screwed with the screw shaft 64 is in a state where the rotation is restricted, so that each outer cylinder 60 is positioned above the inner cylinder 61 holding the nut 63. Alternatively, the main table 11 and the auxiliary table 12 integrated with the main table 11 can be moved up and down simultaneously.

In the above embodiment, the case where the main top plate 11 and the auxiliary top plate 12 constitute a top plate has been described. However, the present invention is not limited to this, and a single top plate may be used. Of course, the present invention can also be applied to a desk adopting, and the planar shape of the top plate is not limited to the illustrated example.

[0028]

As described above, according to the present invention,
Since the second support is connected to the first support so as to be rotatable in a substantially horizontal direction, the left and right plural sets of supports are not disassembled in a state before assembling the elevating device to the top plate. It becomes foldable so as to be substantially parallel to each other, so that the device can be configured as a minimized unit. Therefore, the packaging volume of the elevating device can be reduced, and assembly of the desk can be completed only by fixing each support to the back surface of the top plate in a state where it is opened at a predetermined angle.
Therefore, it is possible to provide a desk suitable for a knock-down type, which can be easily assembled at a destination without requiring special skill, and can maintain constant assembly accuracy. .

Further, the first support and the second support are connected to each other in a partially overlapped state, and an adjusting member which can be fixed by tightening the mating surface is provided. In addition, while the relative rotation of the first and second supports is allowed, the connecting position of the two can be fixed by tightening the adjustment member. Therefore, the positional relationship between the supports can be kept stable, and mechanical malfunctions and the like can be prevented.

Furthermore, since the lifting and lowering operation of the top plate is performed by a gear transmission system by employing the above-mentioned driving gear and driven gear, the raising and lowering operation of the top plate can be performed with a simple operation force, and the gear can be formed by resin coating of the tooth tip region. Can be corrected, the direct contact between the gears can be avoided, and a smooth operation feeling can be ensured, and the generation of mechanical noise and the like can be effectively suppressed.

Further, since the second support is a split type of the inner case and the outer case, the inner case is received in the outer case and the outer case can be fixed to the top plate. The inner case may be received in the outer case as a pre-assembled state, and each leg member side can be assembled very easily with constant accuracy, and the connecting work of the arms and the like constituting the link mechanism is also easy. Becomes

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a desk according to an embodiment.

FIG. 2 is a front view of the desk.

FIG. 3 is a back view taken along the line AA of FIG. 2;

FIG. 4 is a right side view of the desk.

FIG. 5 is a sectional view of a main part of the lifting device.

FIG. 6 is a schematic perspective view of a leg member.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 desk 11 main top plate 12 auxiliary top plate 13 elevating device 15 driving gear 18 as rotating member 18 link mechanism 20 leg member 22 first support 23 second support 23A inner case 23B outer case 33 driven gear 37 rotating plate 38 Arm 50 Adjusting member

──────────────────────────────────────────────────続 き Continuing on the front page (72) Keiko Nakamura, 6-1-1-1 Oimari Minami, Higashinari-ku, Osaka City Inside KOKUYO Co., Ltd. (72) Hideki Hosokawa 625, Imaizumi, Kashiba-shi, Nara Pref. Inside the factory (72) Inventor Tomio Tamaki 625 Imaizumi Co., Ltd., Kashiba City, Nara Prefecture Inside the Ichinobtsu Manufacturing Co., Ltd. (56) References JP-A-7-27334 (JP, A) Jiroku Sho 63-54349 (JP, U) Japanese Utility Model Showa 62-20252 (JP, U) Japanese Utility Model Showa 58-147435 (JP, U) Japanese Utility Model Showa 59-91145 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47B 1/00-97/08

Claims (4)

(57) [Claims] 1. A desk provided with a top plate and an elevating device capable of displacing the height of the top plate, wherein the elevating device comprises: a rotating member disposed on the back side of the top plate; A link mechanism that is arranged on each of the left and right sides with respect to each other, and that can be linked by rotation of the rotating member;
A leg member connected to each of the distal ends of these link mechanisms and having an axial length extendable and contractable by the link operation of the link mechanism; , And each of the link mechanisms is supported and fixed to the top plate.
A second support member connected to the support member so as to be relatively rotatable in a substantially horizontal direction. 2. The first support and the second support are interconnected in a partially overlapped state,
An adjusting member that can be fixed by tightening the mating surface of the superposed supports is provided, and when the adjusting member is loosened, the first and second supports relatively rotate while the adjusting member is tightened. 2. The desk according to claim 1, wherein the connecting position of the first and second supports is fixed. 3. The rotating member is constituted by a driving gear, while the link mechanism is constituted by a driven gear meshing with the driving gear, a rotating plate disposed at an upper end of an axis of the leg member, and a driven gear and a rotating plate. The desk according to claim 1 or 2, further comprising an arm extended to an eccentric position, wherein one of the toothed regions of the driving gear and the driven gear is coated with a resin. 4. The second support comprises an inner case extending along the direction in which the arm extends, and an outer case fixed to a top plate while receiving a tip side of the inner case. The leg member is an outer cylinder suspended substantially vertically downward from the bottom of the outer case, an inner cylinder arranged in the outer cylinder and provided so as to be relatively movable in the axial direction, and is positioned and rotated in the inner cylinder. 4. The apparatus according to claim 3, further comprising a restricted nut member and a rotating shaft screw-engaged with the nut member, wherein a rotating plate of the link mechanism is pivotally supported on an upper end side of the rotating shaft.
Desk described.