JP4579090B2 - desk - Google Patents

Description

  The present invention relates to a desk, and more particularly to a desk having an improved structure of a bearing portion of a link arm that supports a top plate.

  As a desk that can adjust the vertical position of the top plate, for example, an OA equipment table described in Patent Document 1 is known.

The OA equipment table described in Patent Document 1 operates a gas spring by operating an operation lever provided on the lower surface of the top plate, and moves the top plate up and down by expansion and contraction of the gas spring. .
Japanese Utility Model Publication No. 62-48233

  However, when the desk becomes larger and the weight of the top plate becomes larger, it is difficult to raise only with the urging force of the gas spring.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a desk capable of smoothly moving the top and bottom with a simple configuration.

  According to the present invention, the above problem is solved as follows.

  (1) A pair of left and right bearing housings having a bearing portion and a hollow portion adjacent thereto are provided on a support rod provided at the upper end of the leg body, and a base shaft that faces both sides by the bearing portions and faces right and left. The rear end portions of a pair of left and right link arms that support the top plate at the front end portion are fixed to both ends of the front and rear, and the top and bottom plates are moved up and down by rotating the link arms up and down. In addition, a balance spring that urges the link arm to rotate upward is provided in the hollow portion of the both bearing housings.

  (2) In the above item (1), the balance spring is formed by winding the winding in a spiral shape, and one extension end of the winding extending in an eccentric direction from one end of the winding portion. And the other extended end portion of the winding extending in the direction of eccentricity from the other end of the winding portion, the winding portion being externally fitted to a base shaft, and the one extending end The portion is locked to the bearing housing, and the other extending end is locked to the link arm.

  (3) In the above (1) or (2), an urging force adjusting means for adjusting the urging force of the balance spring is provided in the bearing housing.

  (4) In the above item (3), the urging force adjusting means is screwed into the adjusting screw, the adjusting screw provided in the bearing housing in parallel with the tangential direction and rotatably, and the balance spring. One extension end is locked, and is moved in the axial direction by the rotation of the adjusting screw, thereby changing the locking position of one extension end of the balance spring. It consists of.

  (5) In the above items (1) to (4), a pin protruding from one of the opposing surfaces of the bearing housing and the link arm, and the pin are arranged at a predetermined interval in the circumferential direction around the base axis. A pair of projecting portions projecting from one of the other members in a sandwiched manner constitutes a link arm rotation range restricting means.

(6) In the above items (1) to (5), a cylindrical spring spacer is interposed between the base shaft and the balance spring.
(7) In the above items (1) to (6), the end portion of the base shaft has a non-circular cross section, and the end portion of the base shaft is formed into a non-circular shaft hole that forms a complementary shape provided at the rear end portion of the link arm. Mating.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, since the balance spring for biasing the link arm is provided in the hollow portion of the pair of left and right bearing housings, the top plate can be biased upward by the left and right balance springs. it can. Therefore, even when the top plate has a large mass, the top plate can be smoothly moved upward with light force.
Also, since the left and right balance springs are housed in the hollow portions of the left and right bearing housings in the vicinity of the bearing portions, there is little risk of applying an unbalanced load to the base shaft, and the appearance is not exposed to the outside. Is good.

  According to the second aspect of the invention, the structure of the balance spring can be simplified, and the balance spring can be accommodated compactly in the hollow portion of the bearing housing.

  According to the invention of claim 3, since the urging force adjusting means for adjusting the urging force of the balance spring is provided, not only the load of the top plate itself, but also the mass of the equipment etc. placed thereon, The urging force of the balance spring can be balanced, and the top plate can be moved up and down more smoothly.

  According to the fourth aspect of the invention, the structure of the urging force adjusting means can be simplified, and the urging force of the balance spring can be easily adjusted only by rotating the adjusting screw.

  According to the fifth aspect of the present invention, the rotation range of the link arm can be restricted with a simple structure.

  According to the sixth aspect of the present invention, since the cylindrical spring spacer is interposed between the base shaft and the balance spring, interference between the base shaft and the balance spring is prevented, and the top plate is smoothly and abnormally sounded. Can be moved up and down without generating.

  According to the invention of claim 7, since the end of the base shaft has a non-circular cross section, the end of the base shaft is fitted into a non-circular shaft hole that forms a complementary shape provided at the rear end of the link arm. The base shaft and the link arm can be reliably fixed with a simple configuration.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
First, after describing the overall configuration of the desk, the structure of the bearing portion, which is a feature of the present invention, will be described in detail.

  FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of a support frame from which a top plate and an auxiliary top plate are similarly removed.

  The support frame (1) is fixed to a pair of left and right legs (2) and (2) having an inverted T shape when viewed from the side, and the upper ends of the legs (2). A supporting rod (3) (3) facing in the front-rear direction, and a laterally connecting rod (4) (5) before and after connecting the front ends and rear ends of the left and right support rods (3) (3); A top plate support (6) attached to the front part of the left and right support rods (3) and (3) so as to face the front (hereinafter, described diagonally lower left in FIGS. 1 and 2). I have.

  The leg body (2) is composed of a base leg (2a) facing in the front-rear direction and a pedestal (2b) having an approximately elliptical cross section in plan view, which stands slightly rearward of the center. Height adjusters (2c) are provided on the lower surfaces of the front and rear end portions of the base leg (2a).

  As shown in FIG. 5, a hook-like wiring duct (7) facing in the left-right direction with the upper surface opened is provided on the front surface of the rear lateral connecting rod (5), and a wiring duct ( A cover member (8) is detachably installed between the inner surfaces of the left and right support rods (3) and (3) so as to cover the front part of the upper surface opening of 7).

  As shown in FIGS. 2 to 4, the top plate support (6) is mounted on the front end of a pair of left and right support rods (3) and (3) so as to be pivotable in the vertical direction. A pair of parallel link mechanisms (9) and (9) facing left and right are provided.

  The left and right parallel link mechanisms (9) and (9) are pivotally supported by bearing devices (10) and (10), which will be described in detail later, provided at the front ends of the left and right support rods (3) and (3). And a first link facing the front with a rear end fixedly fitted to each end of one base shaft (11) (see FIG. 5) that faces in the left-right direction and passes through the front horizontal connecting rod (4). The arm (12), and the inner end of the arm (12), the rear end of which is pivotally supported by the upward projection (13) provided on the upper front end of the support rod (3), with a pivot (14) pointing in the left-right direction. The second link arm (15), which is positioned higher than the first link arm (12), and the first and second link arms (12) (15) are parallel to each other. An elevating body (18) having a substantially T shape in a side view is connected to the front end portion with shafts (16) and (17) facing left and right.

The upper rear portions of the left and right elevating bodies (18) and (18) are connected to each other with a connecting rod (19) facing in the left-right direction.
The front ends of the brackets (21) and (21) facing the front and rear direction fixed to the both sides of the lower surface of the top plate (20) are located on the front upper ends of the left and right lifting bodies (18) and (18). In front of the center of gravity (G), it is pivotally attached with an axis (22) facing in the left-right direction.

A hydraulic lock for raising and lowering that urges the top plate (20) in the upward direction via the connecting rod (19) at the central portion of the connecting rod (19) and the central portion of the horizontal connecting rod (4). Each end of the attached gas spring (23) is connected so that the gas spring (23) faces the link arms (12) and (15) in a side view.
Further, on the side of the gas spring (23), the rear connection plate (4) and the rear portion of the top plate (20) behind the center of gravity (G) are urged upwards by the rear portion of the top plate (20). The front and rear end portions of the gas spring (24) with a hydraulic lock for supporting the top plate are pivotally attached with shafts (28a) (28b) facing in the left-right direction.

As shown in FIG. 1, the front edge of the top plate (20) is formed in a concave arc shape in plan view that is recessed backward, and the rear edge of the top plate (20) bulges backward. It is formed in a convex arc shape in plan view, and both side edges of the top plate are expanded in a C shape toward the rear in plan view, and the top plate (20) has a substantially fan shape in plan view.
More precisely, the both side edges of the top plate (20) form an arc surface that gradually curves inward as it goes forward, and the front end of the top plate (20) has a slightly soft elastomer resin. A hand placement part (20a) made of a material such as is integrally formed.
The outer peripheral portion of the hand placing portion (20a) has a lower surface as an inclined surface facing obliquely outward and upward.

  With the top plate (20) having such a shape, the center of gravity (G) of the top plate is located behind the center point (C) of the front and rear dimensions of the top plate, and thereby the top plate (20) is Even in a state where the leg (2) is largely extended forward, it can be stably supported. In addition, when the desk is used, the top plate (20) develops in a substantially fan shape centering on the user located in the recess at the front end thereof, so that it is easy to use, and in particular, a large number of OA on the top plate (20). This is suitable when the devices are placed and operated at the same time.

As shown in FIGS. 5 and 6, the lower surface of the top plate (20) has a recess (25) that is long in the front-rear direction in which the rear end of the gas spring (24) is fitted, and the front end of the gas spring (24). A concave portion (26) into which an upper portion of an operation lever (33) described later in the portion is fitted is provided.
A rear end portion of the gas spring (24) is pivotally attached to a bracket (27) provided at the rear end portion in the recess (25) with a shaft (28b) facing in the left-right direction.

The gas springs (23) and (24) may be provided with a known hydraulic lock, and as shown in FIG. 7, a projecting shaft-like valve (29) provided at the front end thereof is connected to a hydraulic lock release operating means described later. (30) By being actuated by the operating lever (33) connected to the wire (32) by the wire (32), it is biased in the extending direction by the built-in gas pressure or the biasing force of the spring (not shown). The valve (29) is released, and the valve (29) protrudes and returns to the locked state. It has become.
The wire (32) passes through the outer tube (34) and is guided to the hydraulic lock release operating devices (30) and (31).

  As shown in FIG. 7, the hydraulic unlocking operation device (30) for operating the gas spring (23) for raising and lowering is provided on the lower surface of the right side portion of the front portion of the top plate (20) and the gas spring for supporting the top plate. The hydraulic unlocking operation device (31) for operating (24) is provided on the lower surface of the left side portion of the front portion of the top plate (20).

  Both hydraulic unlocking operation devices (30), (31) have the same symmetrical structure, and each faces the lower surface of the front corner of the top plate (20) in substantially the same direction as the side edge. And a holding frame (36) that is fitted in a recess (35) that is formed obliquely in the front-rear direction and has a peripheral flange (36a) screwed to the lower surface of the top plate (20). An operating lever (38) is provided in the frame (36) so as to be pivotally attached with a shaft (37) facing upward and downward and accommodated so as to be rotatable by a required angle.

The terminal on the hydraulic unlocking operation device (30) (31) side in the outer tube (34) is attached to the middle part in the front-rear direction on the inner side surface of the holding frame (36), and the holding frame (36) from the terminal The end of the wire (32) extending toward the end is supported by an intermediate portion of the operation lever (38) in the front-rear direction.
On the lower surface of the operation lever (38) on the free end side away from the shaft (37), a handle portion (38a) that is a rectangular recess is provided, and a finger is put on the handle portion (38a), By rotating the operation lever (38) outward along the lower surface of the top plate (20), the wire (32) can be pulled and the gas springs (23), (24) can be unlocked.

As shown in FIGS. 3 to 5, behind the top plate (20), a horizontally long auxiliary top plate (39) has a pair of leg rods (40) and (40) provided on the lower surfaces of both left and right sides. The left and right support rods (3) and (3) are inserted into the legs (2) and (2) so as to be adjustable in height so that they are supported.
The front edge of the auxiliary top plate (39) has an arc shape recessed backward in plan view so as to complement the rear edge of the top plate (20), and the rear edge is the top plate (20). Similar to the rear edge, it has a convex arc shape in plan view that bulges backward.

  In this embodiment, as described above, a portion in front of the center of gravity (G) of the top plate (20) is pivotally attached to the front end portion of the top plate support (6), and the center of gravity of the top plate (20) is provided. Since the portion behind (G) is supported by the gas spring (24), the top plate (20) and the one placed thereon can be stably supported.

  Further, by combining the above configuration with the hydraulic lock release operation device (31) of the gas spring (24) provided on the lower surface of the front portion of the top plate (20), the front portion of the top plate (20) With the hand holding the gas spring, operate the hydraulic lock release operation device (31) of the gas spring (24), and move the front part of the top plate (20) up and down to change the tilt angle of the top plate (20). Can be done easily with natural movement.

  Furthermore, by combining the gas spring (23) and its hydraulic unlocking operation device (30) with the above configuration, the both sides of the front part of the top plate (20) are grasped from above and below with both hands, Operate the hydraulic unlocking operation device (30) of the gas spring (23) for raising and lowering by hand, and operate the hydraulic unlocking operation device (31) of the gas spring (24) for supporting the top plate with the other hand. By operating it, it is possible to easily raise and lower the top plate (20) and adjust the inclination angle at the same time and with natural movements.

  The support mechanism of the top plate (20) is arranged in a concentrated manner on both sides below the top plate (20), and below the central portion of the top plate (20) is a connecting rod (19) and a gas spring. (23) Since only (24) exists, a large space for accommodating the user's feet can be secured below the top plate (20).

  The hydraulic spring unlocking operation device (30) (31) of the gas spring (23) (24) is pulled to the side along the lower surface of the top plate (20), so that the gas spring (23) (24) Since it has an operation lever (33) that can be released from the locked state, the top plate (20) can be grasped from above and below while pulling the operation lever (38) with the same hand. Good.

  In such a desk, since the top plate (20) is large and has a large mass, in order to support the mass, the elevating gas spring (23) must be made strong. Therefore, in the present invention, as shown in FIGS. 8 to 11, a pair of left and right balance springs (in order to assist the biasing force of the gas spring (23) in the left and right bearing devices (10), (10)). 41) (41) is provided so that the gas spring (23) for raising and lowering can be reduced in size and weight.

  That is, each bearing device (10) has a horizontally-bottomed bottom that opens toward the outside and has a bearing portion (42) and a hollow portion (43) adjacent to the bearing portion (42) provided at the front end portion of the support rod (3). A cylindrical bearing housing (44) is provided, and a balance spring (41) is accommodated in the hollow portion (43).

  The bearing part (42) has an end plate shape that closes the inner end of the cylindrical bearing housing (44), and the bearing hole (42a) provided in the center of the bearing part (42) rotates around the end of the base shaft (11). Fits freely.

  Each end of the base shaft (11) is provided with a non-circular shaft portion (11a) which is a square axis in this example, and this non-circular shaft portion (11a) is provided in the rear end portion of the first link arm (12). It fits into a non-circular hole (45) that forms a complementary shape on the side, and from the outside of the first link arm (12), a fixing screw (46) is attached to the center of the shaft end of the non-circular shaft portion (11a). The rear end of the first link arm (12) is firmly fixed to each end of the base shaft (11). (48) is a cap that is press-fitted to the outer surface of the rear end of the first link arm (12) in order to conceal the head of the fixing screw (46).

  In the hollow portion (43) of the bearing housing (44), a cylindrical spring spacer (49) having an enlarged diameter flange portion (49a) at the inner end portion is fitted on both ends of the base shaft (11). On the outside, the winding portion (41a) of the balance spring (41) is externally fitted with some play.

  The balance spring (41) includes the winding portion (41a) in which the winding is wound spirally, and one extension end of the winding extended in an eccentric direction from one end of the winding portion (41a). Part (41b) and the other extended end part (41c) of the winding extended in the direction of eccentricity from the other end of the winding part (41a), and one extended end part (41b) The biasing force adjusting means (50) provided in the bearing housing (44) is locked to the spring locking member (52), and the other extended end (41c) is connected to the rear end of the first link arm (12). The first link arm (12) is biased in the upward rotating direction by being locked to the inner side surface.

  The urging force adjusting means (50) is parallel to the tangential direction of a circle centered on the base shaft (11), which is rotatably provided in the bearing housing (44) so that it can be rotated using a tool from the outside. The adjusting screw (51) and the middle part of the adjusting screw (51) are screwed together, and one extension end (41b) of the balance spring (41) is locked, and the adjusting screw (51) The spring includes a spring locking member (52) that is moved in the axial direction of the adjusting screw (51) by rotation to change the locking position of one extension end of the balance spring.

  Further, a pin (53) protrudes from the surface of the bearing housing (44) facing the first link arm (12), and the pin (53) is projected from the facing surface of the first link arm (12) facing it. ) Is sandwiched between the pin (53) and the pair of protrusions (a pair of protrusions (54) and 54) so as to be sandwiched between the pin (53) and the circumferential direction centering on the base shaft (11). 54) and 54) form rotation range restricting means (55) for restricting the rotation range of the first link arm (12) to a predetermined range.

Therefore, in this embodiment, the balance spring (41) for biasing the first link arm (12) is provided in the hollow portion (43) of the pair of left and right bearing housings (44), (44). The left and right balance springs (41) and (41) can urge the top plate (20) upward, and even if the top plate (20) has a large mass, the top plate (20) Therefore, it can be smoothly moved upward.
In addition, the left and right balance springs (41) and (41) are accommodated in the hollow portion (43) of each bearing housing (44) in the vicinity of the bearing portion (42), so that an eccentric load is applied to the base shaft (11). The appearance is good because it is less likely to be exposed and is not exposed to the outside.

  Furthermore, since the urging force adjusting means (50) for adjusting the urging force of the balance spring (41) is provided, not only the load of the top plate (20) itself, but also the mass of the equipment placed on it. In addition, the urging force of the balance spring (41) can be balanced, and the top plate (20) can be moved up and down more smoothly.

The present invention is not limited to the above embodiment.
In the above embodiment, the top plate support (6) that supports the top plate (20) is provided with a pair of left and right parallel link mechanisms (9) and (9). ) (2) It is good also as a mere arm extended toward the front from the upper part.

It is an external appearance perspective view of one Embodiment of this invention. Similarly, it is the perspective view of the support frame which removed the top plate and the auxiliary top plate. Similarly, it is a side view when the top plate and the auxiliary top plate are set to the lower limit position. Similarly, it is a side view when a top plate and an auxiliary top plate are raised. Similarly, it is a vertical side view of the main part when the top plate is horizontal. Similarly, it is a vertical side view of the main part when the top plate is in a downwardly inclined state. Similarly, it is a top view of the principal part which shows a top plate with an imaginary line. Similarly, it is the perspective view which looked at the bearing housing from the front outside side. Similarly, it is the perspective view which looked at the rear-end part of the 1st link arm from the front inner side. Similarly, it is an enlarged longitudinal sectional front view in which the bearing device is longitudinally cut along a vertical plane including the center of the base shaft. Similarly, it is sectional drawing of the XI-XI line of FIG. 10, (a) shows when the 1st link arm faces the upper limit, (b) shows the time when the 1st link arm faces the upper limit.

Explanation of symbols

(1) Support frame
(2) Leg
(2a) Base leg
(2b) pedestal
(2c) Adjuster
(3) Support rod
(4) (5) Horizontally connected rod
(6) Top plate support
(7) Wiring duct
(8) Cover member
(9) Parallel link mechanism
(10) Bearing device
(11) Basic axis
(11a) Non-circular shaft
(12) First link arm
(13) Upward protrusion
(14) Axis
(15) Second link arm
(16) (17) axis
(18) Lifting body
(19) Linkage
(20) Top plate
(20a) Hand rest
(21) Bracket
(22) Axis
(23) (24) Gas spring
(25) (26) Recess
(27) Bracket
(28a) (28b) axis
(29) Valve
(30) (31) Hydraulic unlocking operation device
(32) Wire
(33) Actuating lever
(34) Outer tube
(35) Recess
(36) Holding frame
(36a) Buttocks
(37) axis
(38) Control lever
(38a) Handle
(39) Auxiliary top plate
(40) Leg
(41) Balance spring
(41a) Winding part
(41b) (41c) Extension end
(42) Bearing
(42a) Bearing hole
(43) Hollow part
(44) Bearing housing
(45) Non-circular hole
(46) Fixing screw
(47) Screw hole
(48) Cap
(49) Spring spacer
(49a) Expanded collar
(50) Energizing force adjustment means
(51) Adjustment screw
(52) Spring locking member
(53) Pin
(54) Protrusion
(55) Rotation range regulating means
(C) Center point
(G) Center of gravity

Claims (7)

  A pair of left and right bearing housings having a bearing portion and a hollow portion adjacent thereto are provided on a support rod provided at the upper end of the leg body, and both end portions of the base shaft facing the left and right directions bearing both sides by the both bearing portions. In addition, the rear end portion of the pair of left and right link arms which support the top plate at the front end portion and which faces in the front-rear direction is fixed, and the link arm is turned up and down to raise and lower the top plate. And a balance spring for urging the link arm to rotate upward in each of the hollow portions of the bearing housings.   A winding portion in which the winding is wound spirally, one extension end portion of the winding extending from one end of the winding portion in an eccentric direction, and the other end of the winding portion It is composed of the other extended end portion of the winding extending in a more eccentric direction, the winding portion is externally fitted to the base shaft, and the one extended end portion is locked to the bearing housing, 2. The desk according to claim 1, wherein the other extending end is locked to a link arm.   The desk according to claim 1 or 2, wherein an urging force adjusting means for adjusting the urging force of the balance spring is provided in the bearing housing.   The biasing force adjusting means is screwed into the adjusting screw, which is provided in the bearing housing so as to be rotatable in parallel with the tangential direction thereof, and one extension end of the balance spring is locked. And a spring locking member which is moved in the axial direction by the rotation of the adjusting screw to change the locking position of one of the extension ends of the balance spring. Item 3. The desk according to item 3.   A pair of pins projecting on one of the opposing surfaces of the bearing housing and the link arm, and a pair of pins projecting on either one of the pins so as to be sandwiched at a predetermined interval in the circumferential direction around the base shaft The desk according to any one of claims 1 to 4, wherein the projecting portion constitutes a rotation range regulating means of the link arm.   The desk according to any one of claims 1 to 5, wherein a cylindrical spring spacer is interposed between the base shaft and the balance spring. The end portion of the base shaft has a non-circular cross section, and the end portion of the base shaft is fitted into a non-circular shaft hole having a complementary shape provided at the rear end portion of the link arm. Desk according to any one.

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