JPH10257937A - Armrest memorandum stand device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling and enable state use without looseness of a memoran dum stand by working a forked stopper of a turning frame to a pair of notched stepped parts provided on the outer periphery of a boss part of a case body when the memorandum stand is used to stably support the memorandum stand. SOLUTION: A memorandum stand device 10 comprises a case body 11 made of an aluminium alloy, a memorandum stand turning frame 12 and a memorandum stand bearing plate 13, wherein, when the memorandum stand is put in the working state, a forked stopper 38 of the turning frame 12 is pressed to the thick part of an intermediate boss part 41 of the memorandum stand bearing plate 13, and the tips of the forked stopper are engaged with notched stepped parts 23, 23 in such a manner as to clamp the central projection part 24 of the case body boss part, so that the memorandum stand can be stably supported against the external force round the axis. When the memorandum stand is erected, the intermediate boss part 41 brought into contact with the stopper 38 is on the thin part side, so that the stopper 38 is raised to disengage from the notched stepped part 23 to freely turn the turning frame 12 to the case body 11 and put the frame in the suspending state by the dead load of the memorandum stand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memo table device attached to an armrest of a single chair or a connected chair.

[0002]

The applicant of the present invention has proposed a memo table device for a row-and-row chair installed in a hall (Japanese Patent Application No. Hei 7-300629). The present invention provides a memorandum device that is lighter than the above-mentioned memorandum device, can be easily manufactured without using special parts, and has a stable operation.

[0003]

When the memo table device of the present invention is of a fixed type with respect to the armrest, the case is fixed to the inner surface of the armrest and the case is pivotally attached to the case, and the armrest is attached to the case. The case body is substantially rectangular and has a protruding boss portion surrounding a center hole on one side surface thereof and a detent dovetail-shaped protrusion connected to the boss portion. A pair of rotation guide grooves provided in a semi-circular shape around the center hole on the side facing the protrusion, and a pair of central protrusions interposed between the protrusion boss surfaces on the upper end side of the rotation guide groove. A step is formed, and the rotating frame is provided with a substantially semicircular arc-shaped recess accommodating the boss portion and the dovetail-shaped protrusion of the case body, and is protruded at the center thereof and inserted into a center hole of the case body. A shaft portion, and a protruding pin fitted into the rotation guide groove of the case body. The boss portion is provided so as to be able to protrude and retract in an intermediate concave portion of the boss portion, and when the memo table receiving plate falls down, it is pressed down by the thick portion of the boss portion of the base plate to descend and descend. The protruding pin is provided with a bifurcated stopper that engages with the stepped portion, and the distal end of the protruding pin is urged by a tension spring having a base end fixed to the back surface on the other side of the case body. In the case of an automatic retractable type in the armrest accommodating room, the above-mentioned memo table device is attached to the tip of the slide substrate slidably with respect to the guide base plate fixed to one inner wall of the room, and the slide substrate is mounted. A lever having a guide pin protruding rearward at the front end is pivotally connected, and a pin connection is made between an intermediate portion of the lever and an outer peripheral portion of the rotating frame of the memo table device by a rod link, and a guide pin of the lever is connected. It is configured to be fitted into a linear slide groove of a guide fixed to the other inner wall surface in the room. In the above case, the lever is preferably provided with a retraction spring for facilitating automatic retraction of the slide substrate.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an armrest of a chair, and reference numeral 2 denotes a memo table, which is attached to the inner surface of the armrest or retractable into a storage room. Reference numeral 10 denotes a memo table device of the present invention, which comprises a case body 11 made of an aluminum alloy, a memo table rotation frame 12, and a memo table receiving plate 13. As shown in FIGS. 2 and 3, the case body 11 is substantially rectangular and has a boss 21 on one surface side surrounding the center hole 20 and a dovetail-like projection 22 on a part of its outer periphery to prevent rotation.
And a pair of left and right notch steps 2 above the boss.
3 are formed. Reference numeral 24 denotes a central projection. 25 is
A semicircular arc-shaped rotation guide groove formed on the side opposite to the dovetail-shaped protrusion 22. As shown in FIG. 4, the memo table rotating frame 12 is provided with a substantially U-shaped concave portion 30 and a cushion-like stopper 31 provided at the upper end thereof for colliding with the side surface of the dovetail-shaped protrusion. A shaft portion 32 to be inserted into the projection 20 is provided. 32a is a mounting screw. Reference numeral 33 denotes a pin protruding from the upper rear surface of the shaft portion.
Is inserted into. 34 and 35 are 2 formed on the upper surface side of the frame.
The continuous boss portion 36 is an intermediate concave portion, and a hole 37 into which a bifurcated stopper 38 is fitted is formed in the bottom surface portion. 39
Is a compression spring that causes the stopper to protrude and retract. Projection pin 33
Is fitted into the rotating groove 25 of the case body, the distal end 27 of the tension spring 26 is screwed 33a at the distal end thereof, and the proximal end 28 of the spring is located at the rear surface of the case, for example, at the position of the proximal end 28 in FIG. Fixed directly. As a result, a tension spring force always acts on the protruding pin 33 and thus the rotating frame 12. Memo stand backing plate 1
3 is an intermediate boss portion 4 of the triple boss portion 40 provided on the base end side.
1 is located in the intermediate recess 36 of the rotating frame and is hingedly connected by a pin shaft 42, and the intermediate boss 41 is
In contact with the upper surface of the FIG. 6 is a cross-sectional view when the memo table is used. The two-pronged stopper 38 is pressed by the thick portion of the intermediate boss 41 of the memo table receiving plate, and the two-pronged end thereof is shown in FIG.
As described above, it engages with the notch steps 23, 23 so as to sandwich the central projection 24 of the case body boss, and resists an external force in the direction around the axis. When the memo stand is erected, the intermediate boss 41 abutting on the two-pronged stopper 38 becomes thinner as shown in FIG. 7, so that the two-limb stopper 38 rises to break the engagement with the notch step 23, Since the rotating frame 12 is freely rotatable with respect to the case body 11, if the memo table is slightly pushed forward, the memo table is lowered by its own weight as shown in FIG. Is held. When the memo table 13 is put into the use state, the state shown in FIG.
Of course, the operation is performed as shown in (a), but after the state shown in (b), the resistance is reduced because the spring force acts on the side that raises the memo table. The center of gravity of the memo table is usually located forward of the shaft portion 32, and the memo table in the upright state is urged forward by a turning force. Movement can be facilitated. That is, the base end 28 of the tension spring 26 is not fixed to the back surface of the case, but is connected to a rotating lever 29 pivotally attached to the back surface of the case as shown in the figure. Thus, in the hanging state of the memo table (FIG. 8C) and the intermediate state (FIG. 8B), a tension spring force acts on the protruding pin 33 of the rotating frame 12, but as shown in FIG. When is in the upright state, no spring force is applied and the memo table is free to rotate in the direction of the arrow. Reference numeral 29a denotes a stopper screw for adjusting a rotation free range. When the memo table is used, that is, when it is lying down, the memo table receiving plate 13, the rotative frame 12 and the case body 11 are firmly integrated by the bifurcated stopper 38 as shown in FIG. However, in the upright state and the stowed state, the rotating frame 12 and the memo stand receiving plate 13 are unstable because they are hinged only. In order to solve this, an inclined surface 44 is formed on the double boss portions 34 and 35 of the rotating frame, and a pressing plate 46 constantly urged by a pressing spring 45 is provided inside the memo table receiving plate so as to be able to protrude and retract. The slope 47 provided at the tip is brought into face-to-face contact with the slope 44 of the boss. As a result, in the upright state of the memo table, the two slopes 47 and 44 are pressed and abutted as shown in FIG. 7, so that the slab is stable, and even when the memo table is folded down as shown in FIG. Because it is in contact with the outside, it is more stable.

FIG. 9 is an exploded perspective view of the automatic retraction mechanism, in which 3 is a storage chamber immediately below an armrest, 4 is one inner wall, and 5 is the other inner wall. 50 is a guide base plate fixed horizontally to the inner wall 4, 51 is a liner made of synthetic resin, 52 is a rear end bracket, and a stopper 53 and one end of a tension spring 54 are locked. Reference numeral 55 denotes a slide board which is laid on the guide base plate and slides, and the device 10 of the present invention is fixed to the tip side thereof. A lever 56 is pivotally mounted 57 on the rear end side of the slide board.
And the other end of the spring 54 is locked. A guide pin 58 protrudes from the tip of the lever. One end of a rod link 60 is pivotally connected to a substantially intermediate portion of the lever 61, and the other end 62 of the rod is pivotally connected 64 to a connecting portion provided on the outer peripheral surface of the rotating frame 12. A guide pin 65 is fixed to the other inner wall 5 and has a linear slide groove 66 formed therein, into which the guide pin 58 or the roller 59 of the lever is fitted. FIG.
11A is a plan view of the automatic retraction mechanism in an assembled state, and operates as shown in FIGS. 11A, 11B, and 11C. FIG. That is, as shown in FIG. 3A, when the memo stand 2 is erected and the two-stopper is released from the boss portion, the memo stand 2 is rotated forward by its own weight and the slide substrate 5 is pulled by the spring 54.
5 retreats. With the rotation of the rotation frame and the retraction of the slide board, the tip guide pin 58 of the lever moves in the slide groove 66 as shown in FIG. 2B, and is stored in the storage chamber as shown in FIG. Is done. The drawer is pulled out by the opposite operation.

[0006]

In the above-mentioned prior art, Japanese Patent Application No. Hei 7-300269, in which the projecting pin of the rotating frame is connected to a torsion coil spring via a link, requires a lot of time for assembling work and is relatively unstable in operation. Although the memo table restricting force was weak because the upper rotation stopper was a single pin, the device of the present invention was not assembled because the tension spring was directly connected to the protruding pin without using the torsion coil spring. Easy and stable operation. Further, since the memo table is firmly held by the bifurcated stopper, it is stable without swinging during use. Also, the automatic retraction mechanism has a simple link configuration and does not use any special parts, so that it can be manufactured at a low cost and light weight.

[Brief description of the drawings]

FIG. 1 is a plan view of a connection chair to which an armrest memo stand is attached.

FIG. 2 is a front view of a case body.

FIG. 3 is a top view of the case body.

FIG. 4 is an exploded perspective view of a main part viewed from the back side of the case body.

FIG. 5 is a partially enlarged cross-sectional view in which a two-pronged stopper is pushed in.

FIG. 6 is a vertical cross-sectional side view of the center of the boss when the memo table is used.

FIG. 7 is a side view of the center of the boss with the memo stand in an upright state.

FIG. 8 is an explanatory view showing a turning process of the memo table.

FIG. 9 is an exploded perspective view of the automatic retraction mechanism.

FIG. 10 is a plan view of a main part in a stored state.

FIG. 11 is an explanatory view showing a rotating accommodation process of the memo table device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Case body 12 Rotating frame 13 Memo table receiving plate 20 Center hole 21 Boss 22 Pigtail-like protrusion 23 Notch step 24 Central protrusion 25 Rotation guide groove 26 Tension spring 29 Rotation lever 30 Recess 32 Shaft 33 Projection Pins 34,35 Double boss portion 36 Intermediate concave portion 37 Stopper receiving hole 38 Two-way stopper 39 Spring 41 Intermediate boss portion 44,47 Slope 50 Guide base plate 55 Slide board 56 Lever 58 Guide pin 60 Rod link 65 Pin guide body 66 Slide groove

Claims (4)

[Claims] 1. A memo table comprising: a case body fixed inside an armrest of a chair; and a memotable rotation frame rotatably pivotally mounted on the case body and rotating parallel to the armrest. In the device, the case body is substantially rectangular and has a projecting boss portion surrounding one side surface on one side surface thereof, a detent projection connected to the boss portion, and a semicircle centered on the center hole on a side facing the projection portion. A pair of steps are formed on the surface of the protruding boss at the upper end side of the rotation guide groove formed in an arc shape and a central protrusion is interposed therebetween, and the rotation frame is formed of the case body. A boss portion and a substantially U-shaped concave portion for accommodating the rotation preventing projection portion, a shaft portion projecting from the center thereof and inserted into a center hole of the case body, and fitted into a rotation guide groove of the case body. A double boss portion having a protruding pin and connecting the memo table receiving plate with a pin; And a bifurcated stopper which is pressed down by the thick portion of the boss portion of the base plate when the memo support plate falls down and engages with a pair of step portions of the case body. Is biased by a tension spring having a base fixed to the other back surface of the case body. 2. A memo table device is attached to a slide board tip end slidable with respect to a guide board fixed to one inner wall of a storage chamber provided in an armrest portion of a chair, and a memo table device is provided behind the slide board. A lever having a guide pin protruding at the tip is pivotally connected, and an intermediate portion of the lever and a rotation frame outer peripheral portion of the memo table device are pin-connected by a rod link, and a guide pin of the lever is provided inside the room. It is configured to fit into a linear slide groove of a guide body fixed to the other inner wall surface,
The memo table device comprises a case body and a memo table rotation frame pivotally attached to the case body, the case body having a substantially rectangular shape and a protruding boss surrounding a center hole on one side surface thereof. A detent protrusion connected to the boss portion, a rotation guide groove penetrating in a semicircular shape around the center hole on a side facing the protrusion, and the protrusion boss on an upper end side of the rotation guide groove. A pair of steps are formed on the surface of the casing with a central projection interposed therebetween, and the rotating frame has a substantially U-shaped recess for accommodating the boss portion and the detent projection of the case body, and is provided at the center thereof. A boss portion inserted into a center hole of the case body, a protruding pin fitted into a rotation guide groove of the case body, and a double boss portion for connecting a memo table receiving plate with a pin; Is provided so as to be able to protrude and retract in the intermediate recess of the memo table receiving plate. A memo table device having a bifurcated stopper which is engaged with a pair of steps of the case body and whose distal end is urged by a tension spring having a base end fixed to the back surface on the other side of the case body. . 3. The memo table device according to claim 1, wherein a base end of the extension spring is connected to a rotating lever pivotally attached to a back surface of the case body. 4. A slope 44 is formed in the double boss portion, and a spring-biased pressing plate is provided inside the memo table receiving plate, and the slope 47 provided at the tip of the pressing plate is mounted on the memo table when the memo table stands upright. The device according to any one of claims 1 to 3, wherein the device is configured to make face-to-face contact with the slope (44).