JPS5934355Y2 - lectern - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a bookstand, and is characterized in that the inclination angle of the back plate supporting books can be freely changed.

The lectern is required to place books in an open state and maintain it at an appropriate inclination angle.

The proper tilt angle for an open book is 45° with respect to the horizontal plane.
Furthermore, it is said that the ideal distance from a book to your eyes is 30 cm.

However, when actually reading, it may be more convenient not to use the above-mentioned angle or distance, depending on the lighting condition at the time, the posture of the person reading, etc.

The present invention was developed in view of this point, and is designed to allow the angle of inclination of the backboard supporting the book relative to the base to be freely and easily changed depending on the reading situation.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a base, which is made of a synthetic resin board or a wooden board, and has a front stand part 1a on which a book is opened and placed, and a sliding plate to be described later. It has a sliding surface 1b that moves and is composed of a trailing portion 1C that is connected to the front platform portion 1a in a T-shape.

The base 1 also has a cylindrical portion 2 for forming a hinge.
Two of them are provided at an appropriate distance apart, and the back plate 3 is rotatably attached to the back plate 3 by inserting a shaft into a hole provided at the lower edge of the back side thereof.

The back plate 3 is also formed of a synthetic resin board or a wooden board.

Needless to say, the base 1 is for supporting the entire weight, and the back plate 3 is for supporting the books.

Two holes 1d; 6j bordered by annular protrusions are provided in the front part 1a of the base 1, and a cap 4 made of an elastic material having a groove inside is press-fitted into the hole 1d. It's neatly fitted.

A bending frame 5 having synthetic resin caps 5a at both ends, as shown in FIG. 1, is press-fitted into the groove of the cap 4. As shown in FIG.

As mentioned above, the bending frame 5 has a cap 4 made of an elastic material.
Since it is press-fitted into the kerf of the cap 4, it is held in the kerf by the restoring force of the cap 4, and its lower part is in contact with the edge of the hole 1d, which is an annular protrusion. It won't fall off.

In order to more firmly fit the cap 4 into the hole 1d, a groove is provided at a position corresponding to the 7L1d of the bottom plate, which will be described later, the width of which is slightly wider than the cut groove, and the horizontal cross-sectional shape of the groove is slightly larger than that of the groove. The cap 4 may be fitted into the hole 1d by providing a straight-shaped projecting piece and press-fitting this projecting piece into the cut groove.

This bending frame 5 serves as a dowel for holding down books, and is able to rotate 180 degrees with appropriate hardness.

On the back surface of the back plate 3, two protrusions 6 having holes are provided at an appropriate distance.

The pin portion of a plate-shaped support rod 7 having pin portions protruding from both sides of one end is inserted into the hole of the protrusion 6, so that the support rod 7 has a connection between the pin portion and the protrusion 6. It is rotatably attached to the back plate 3 using the engaging part as a pivot part.

What is indicated by the reference numeral 8 in FIGS. 2 and 3 is a sliding plate provided within the base 1. As shown in FIG.

As shown in the figure, this sliding plate 8 has a rectangular shape, and a long groove 8a is provided at its front portion, and protrusions 8b rising upward are provided at both ends of the long groove 8a in the longitudinal direction. .

Further, a stopper portion 8C is provided at the rear end of the sliding plate 8, and the lower end portion of the support rod 7 comes into contact with the stopper portion 8C, so that the support rod 7 is locked.

This sliding plate 8 slides back and forth on the sliding surface 1b using the side wall 1e provided at the bottom of the rear housing portion 1C of the base 1 as a guide.

When this sliding plate 8 moves forward, the back plate 3 is lifted upward via the support rod 7 that is locked by the stopper part 8C, and when it moves backward, the back plate 3 is lifted by its own weight. , the lower end of the support rod 7 comes down while touching the stopper portion 8C.

The positioning device sets and holds the back plate 3 at an appropriate inclination angle, and as shown in FIG. It consists of the attached cam 10 and a claw member 11 having a claw portion 11a that engages with the teeth of the gear 9.

The gear 9 and the cam 10 are provided with a cylindrical part 12 hanging down from the center of the gear 9, and a sleeve 13 hanging down from the base 1 is provided in the hollow part of the cylindrical part 12. By fitting with clearance, the gear 9 and the cam 10
, the position other than the rotational direction can be determined.

Further, the gear 9 is provided with a claw portion 11 a of the claw member 11 from both sides.
are engaged, and this causes the gear 9 and the cam 1 to
The rotational position of 0 is determined.

Here, a part of the outer circumferential surface of the cam 10 is interposed in the internal space formed between the protrusions 8b, 8b of the sliding plate 8, and furthermore, the outer circumferential surface of the cam 10 is The shape is set so that it is always in contact with the inner side surface of the protrusions 8b, 8b, regardless of the rotational position of the gear 9.

The claw member 11 has, at its inner tip, a claw portion 11 a that becomes sharper toward the tip, and a hole 11 b that surrounds a sleeve 14 with a small clearance and has a female screw thread for attaching a bottom plate, which will be described later. , and a thin leaf spring portion 11C extending outward from the vicinity of the aforementioned hole 11b.

In the figure, reference numerals 15 and 16 indicate locking pieces attached to the back surface of the base 1.

A fan-shaped notch 17 is provided in the center of the front part 1a of the base 1, and a part of the gear 9 is exposed in this notch 17. A fingertip touches a portion when rotating the gear 9.

Further, a protrusion 1f as shown is provided in the center of the front platform portion 1a.

This protruding body 1f functions to prevent the book from slipping.

After assembling the sliding plate 8, gear 9, pawl member 11, etc., the bottom plate 18 is attached to the base 1 from below with screws.

At this time, the dimensions of the sliding plate 8, gear 9, pawl member 11, etc. are set so that they are assembled with slight pressure, and the vertical play of the sliding plate 8, gear 9, pawl member 11, etc. becomes nothing.

One embodiment of the present invention has the following configuration since it has the following configuration.

That is, when a part of the gear 9 exposed in the fan-shaped notch recess 17 provided in the front part 1a of the base 1 is turned to the left or right with a fingertip, the gear 9 rotates around the sleeve 13. Rotate.

At this time, the cam 10 eccentrically attached integrally to the gear 9 also rotates.

The cam 10 is interposed in the internal space formed between the protrusions 8b, 8b of the sliding plate 8, and is in constant contact with the inner side surfaces of the protrusions 8b, 8b, so that, for example, In FIG. 3, when the gear 9 is rotated clockwise, it pushes the inner side of the front protrusion 8b and tries to move the sliding plate 8 forward.

A long groove 8a is provided in the longitudinal direction at the front of the sliding plate 8, and since the sleeve 13 and the cylindrical portion 12 are engaged with the long groove 8a, the sliding plate 8 eventually slides forward. .

Similarly, in FIG. 3, when the gear 9 is rotated counterclockwise, the cam 10 pushes the inner surface of the rear protrusion 8b of the sliding plate 8, and moves the sliding plate 8 backward.

As shown in FIG. 3, the cam 10 is approximately circular, and its front and rear sides are symmetrical in shape, so that when the gear 9 rotates once, the sliding plate 8 moves in the front and back direction. It will take one round trip.

Therefore, if the inclination angle range of the back plate 3 is set to an appropriate value (for example, 30° to 60°), one rotation of the gear 9 causes the back plate 3 to move up and down within that angle range.

Then, when a suitable inclination angle of the back plate 3 is obtained, rotation of the gear 9 is stopped at that position.

For example, in the case of the claw member 11 on the right side in FIG. As a result, it attempts to rotate counterclockwise with the claw portion 11a as the tip.

However, since the claw member 11 is locked by the locking piece 15, the claw portion 11a ends up urging the gear 9 to the left.

Similarly, in FIG. 3, the claw portion 11a of the left claw member 11 urges the gear 9 to the right.

In other words, the gear 9 is elastically held by both claw members 11.11.

It goes without saying that the clamping force of the claw member 11 on the gear 9 must be large enough to reliably fix the vertical movement of the back plate 3 on which the book is placed, but it is also necessary to adjust the position of the back plate 3. In this case, the rotation of the part of the gear 9 exposed in the notch recess 17 by the fingertip, in other words, the engagement of the claw part 11 a of the claw member 11 with the teeth of the gear 9 is controlled by the claw part. It must also be large enough to resist the biasing force of gear 9 of 11a and facilitate the movement of engagement with the next tooth.

This can be easily determined by considering the shape of the claw member 11, etc.

The gist of the present invention is as described above, and as a result, the inclination angle of the backboard supporting the book with respect to the base can be arbitrarily and easily changed, and the backboard with the book placed on it can be reliably stopped at an arbitrary position. We can provide a lectern that will do the job.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a perspective view of one embodiment of the present invention.
FIG. 3 is a bottom view of the positioning device. 1... Base, 3... Back plate, 7...
... Support rod, 8 ... Sliding plate, 9 ... Gear, 10 ... Cam, 11 ... Claw member.

Claims (1)

[Scope of utility model registration request] A lower edge of the back plate is pivotally connected to a base, a gear having an eccentric cam is rotatably attached to the base, and a sliding plate is provided on the base to engage and interlock with the eccentric cam. Support rods are interposed between the sliding plate and the back surface of the back plate in a manner that they can be raised and lowered freely, and the support rods are disposed at positions facing each other across the gear, and are always propelled in the direction of engagement with the teeth of the gear. A lectern characterized in that two biased claw members are attached to the base.