JP3268719B2 - Automatic stand rotation control device for memo stand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal position when a memo table or a table board (hereinafter collectively referred to as a memo table) attached to a chair armrest so as to be rotatable can be stored in a fixed position. The present invention relates to an automatic upright rotation restricting device that is automatically raised up and rotatably accommodated.

[0002]

A storage memo table fixed to an armrest or attached to a slide mechanism in a storage chamber provided inside the armrest is hinged so as to be able to fall down on a rotating member which rotates with respect to the mounting base. The rotary member is horizontally set at a predetermined position during use, and is stored in a fixed position while being held at a position parallel to the rotation surface of the rotation member during storage. Therefore, the memo table must not swing or tilt with respect to the rotating member during rotation during storage. According to the present invention, when the memo table is in the upright state, the rotation of the rotative member is restricted between the horizontal state and the fully upright state while securing the upright state of the memo table with respect to the rotating member during rotation storage. To provide such a device.

[0003]

According to the present invention, there is provided a fixed shaft having a pin hole formed in a peripheral surface thereof, which is provided on a member to be attached to an armrest or the like, and which is fitted to the fixed shaft and provided on an outer peripheral portion thereof. A rotating frame having a rotation stop retracting pin spring-biased in a recess between the pair of hinge connecting bearing projections; a pressing projection fitted into the recess of the rotating frame; and the pair of bearing projections A memo table mounting plate having a slide plate that is constantly urged and pressed inside is provided on the outer surface of the memo table, and an arc surface portion and a tapered surface are provided on the outer surface of the bearing projection, and a tapered surface is formed at the tip of the slide plate. Then, when the memo table mounting plate is positioned on the rotating surface of the rotating frame, the tapered surfaces face-to-face engage with each other, and the retractable pin is disengaged from the pin hole of the fixed shaft and the rotating frame is rotated. It is configured to enable the rotation of. The slide plate tip is preferably bifurcated so that each is in contact with the outer surface of each bearing. In addition, the thickness of the mounting plate is reduced and the elastic force of a spring provided on the back surface of the slide plate is strengthened. It is preferable to use a character spring.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a memo table, 2 denotes a memo table mounting plate, 20 denotes a rotating frame, and 4 denotes a mounting base, which is fixed to an inner wall of an armrest 5. Reference numeral 10 denotes a fixed shaft protruding from the front surface of the base, and a pin hole 11 is formed in the upper peripheral surface. Reference numeral 12 denotes a rotation guide groove formed in a range of about 180 ° along the outer periphery of the fixed shaft. A fixed shaft fitting hole or fitting recess 21 is provided at the center of the rotating frame 20, and a guide pin 22 fitted into the rotating guide groove 12 is provided on the inner side surface. 23
Denotes a pair of bearing projections projecting from the upper outer periphery of the rotating frame;
Is an intermediate recess, and 25 is a pin hole for receiving the spring-loaded pin 26. An arcuate portion 27 and a tapered surface 28 are formed on the outer peripheral surface of the bearing projection, and a step receiving end portion 28a of a slide plate is provided below the tapered surface to ensure that the memo table stands upright. 29 is an axis. Base end 3 of memo stand mounting plate
0 is provided with a concave portion 33 for fitting the pair of bearing portions 32 and the bearing 23 of the rotating frame, and a pin pressing projection 34. The pin pressing projection 34 has two surfaces having different distances from the axis center for inserting and removing the pins 26. Reference numeral 35 denotes a slide plate slidably provided in a plate of the mounting plate. A pair of tapered surfaces 36b is formed on one surface of a distal end portion 36 so that the base end portion 3 is provided.
The protrusion 33 protrudes into the recess 33 from the through hole 31 provided in the hole 0. 36a
Is the tip of the slide plate. 37 is a storage portion for the slide plate,
Reference numeral 38 denotes an S-shaped spring provided on the back surface of the slide plate for strongly pressing the slide plate. 39 is a spring accommodating part. The through hole 31 does not need to be formed in the memo table mounting plate, and may be a slidable space provided between the memo table and the mounting plate. When the memo table 1 is in use, it is in a horizontal state as shown in FIG. 2, and the retracting pin 26 is pressed by the pressing projection 34 and inserted into the pin hole 11 of the rotating shaft, and the rotating frame 20 is moved relative to the fixed shaft 10. Rotation is disabled. In the case of storing the memo table, when the memo table is flipped up, the slide plate tip 36a which is always pressed and urged forward is pressed to the outer circumferential surface 27 of the bearing 23.
4, the taper surface 36b of the slide plate slides along the taper surface 28 of the bearing projection of the rotating frame and engages face-to-face with the resilient force of the spring 38, and the tip end 36a of the slide plate becomes the step 28a. 5 and becomes an upright state as shown in FIG. 5, and thereafter maintains that state by a strong spring force.
When the memo table mounting plate is in the upright state, the projection pin 26 pressed by the pin pressing projection 34 is moved to the pin hole 11 of the fixed shaft.
, So that the memo table can rotate. When the memo table is rotated and retracted and the front drawer is rotated, the state of FIG. 5 in which the tapered surfaces 36b and 28 are engaged face-to-face is maintained, so that the memo table does not swing. In the present invention, since the slide plate tip 36a constantly presses the outer periphery of the bearing projection 23, there is no play between the slide frame and the rotating frame, so that the operation is stable and quiet during operation. The rotating frame 20 is rotated about a fixed axis of the mounting base 4. As shown in FIG. 5, the rotating power of a coil spring 40 built in the base is provided by a tongue 41 and a link 42. The memo table is constantly urged toward the fixed storage position in FIG.

[0005]

According to the present invention, since the tip of the slide plate is always in contact with the arc surface of the bearing projection by a strong spring force, it operates smoothly when the memo table is flipped up from a horizontal state and when it is positioned horizontally from an upright state. Has the effect of not generating noise. In addition, during the automatic stand-up operation of the memo table, when the tip of the slide plate passes through the uppermost position of the bearing arc surface, it reaches the tapered surface of the bearing and the protruding pin is inserted into the pin hole of the fixed shaft just before the memo table becomes vertical. Since the rotation of the rotating frame is restricted, the memo table does not rotate in a state inclined with respect to the rotating frame, so that the memo table is safe.

[Brief description of the drawings]

FIG. 1 is an inside perspective view of a chair armrest with a memo table attached externally.

FIG. 2 is an essential part cross-sectional view when the memo table is in a horizontal state.

FIG. 3 is a plan view of FIG. 2 with a memo table removed;

FIG. 4 is an essential part cross-sectional view of the memo table in the middle of an up-and-down operation.

FIG. 5 is an essential part cross-sectional view when the memo stand is in an upright state;

FIG. 6 is an exploded view of components of the device of the present invention.

[Explanation of symbols]

 2 Memo stand mounting plate 4 Mounting base 10 Fixed shaft 20 Rotating frame 23 Bearing protrusion 24 Concave 25 Pin hole 27 Circular portion 28 Tapered surface 34 Pin pressing protrusion 35 Slide plate 36a Tip 36b Tapered surface 38 S-shaped spring

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47C ^7/ 68-7/ ⁷⁰

Claims (3)

(57) [Claims] 1. A fixed shaft protruding from a mounting member and having a pin hole formed in a peripheral surface thereof, and a concave portion between a pair of hinge connecting bearing protrusions fitted on the fixed shaft and protruding from an outer peripheral portion. A rotating frame provided with a spring-biased rotation stopping and retracting pin, a pin pressing projection fitted into a recess of the rotating frame, and a slide plate constantly biased against the outer surfaces of the pair of bearing projections. An inner surface of the memo table mounting plate is provided. An arcuate surface and a tapered surface are provided on the outer surface of the bearing projection, and a tapered surface is formed on one surface of the tip end of the slide plate. When positioned on the rotating surface of the moving frame, the respective tapered surfaces engage with each other face-to-face, and the retractable pin is disengaged from the pin hole of the fixed shaft to enable the rotating frame to rotate. An automatic upright rotation restricting device for a memo table. 2. A device for automatically raising and rotating a memo table according to claim 1, wherein the elastic pressing means of the slide plate provided in the memo table mounting plate is an S-shaped spring parallel to the plate surface of the mounting plate. . 3. The automatic upright rotation restricting device for a memo table according to claim 1, wherein a slide plate tip receiving step portion is provided below the tapered surface formed on the outer surface of the bearing protrusion of the rotation frame.