JPH0711661B2 - Detachable mounting device for cylindrical body - Google Patents

Description

The present invention relates to an apparatus for detachably attaching a tubular body,
For example, it is an appropriate mounting device which is mounted on a hood mounted on the lens barrel of a photographic camera.

“Prior Art” Many camera hoods are attached to the lens barrel with a bayonet-type attachment device.

The bayonet type mounting device is fitted while rotating the hood, and by engaging the bayonet claws on the lens barrel side and the hood side, this meshing part is pressed by the spring in the thrust direction and the hood is held by friction force. It is configured to be.

[Problems to be Solved by the Invention] As described above, since the conventional hood is attached by the bayonet type attachment device, the attached hood may come off due to vibrations received while the camera is in use. is there.

Although a fairly strong spring is used to prevent this adverse effect, there is a problem that the bayonet claw of the lens barrel is flawed by the spring. Further, the above-mentioned bayonet-type mounting device cannot be said to be simple in design and production, for example, by forming bayonet claws on the lens barrel and the hood and providing springs for pressing the meshing parts of the claws.

"Means for Solving Problems" The present invention was developed in view of the problems described above, and a first object thereof is to develop a mounting device which can be attached and detached by one-touch, and a second object thereof. The object is to develop a mounting device with a small number of parts that can be easily assembled and produced without providing such bayonet claws and springs, and without requiring screwing or bonding.

Thus, in the present invention, a cylindrical body provided on the outer peripheral surface of the inner cylinder so as to move in the cylinder axis direction and provided with an outer cylinder positioned at a predetermined movement position, and the outer cylinder formed near the cylinder end. A concave portion along the inner cylinder circumferential direction, which is provided on the outer surface of the inner cylinder in the window hole and is partially closed by a part of the outer cylinder when the outer cylinder is positioned; A seesaw member having a support shaft that is fitted and rotatably supported by a part of an outer cylinder by its positioning, and is provided in the window hole so that both sides thereof are parallel to the cylinder shaft, and one of the seesaw member. A locking portion provided on the tip of the tube and an elastic force member provided on the other side to apply a locking force to the locking portion. The seesaw member against the elastic force to lock it Suggest a detachable mounting device of the structure as the cylindrical body to remove to release the engagement.

In the above-described mounting device of the present invention, the locking portion of the seesaw member is locked to the locking receiving portion of the mounting target by simply pressing the tubular body against the mounting target, and the mounting state is established. By pressing the side, the locking of the locking portion is released and the tubular body can be removed. For example, if the hood for a camera is equipped, the hood can be attached and detached by one-touch operation.

Further, since the support shaft of the seesaw member is supported by moving and positioning the outer cylinder, the seesaw member can be assembled without the need for means such as screwing or bonding.

[Example] Next, an example in which the present invention is applied to a hood for a camera will be described with reference to the drawings.

FIG. 1 is a perspective view showing a mounting side of a hood to a lens barrel, and FIG. 2 is a partially enlarged sectional view of the hood showing a mounting state.

In these figures, 11 is a hood main cylinder, 12 is a hood outer cylinder, and 13 and 14 are operating members.

Since the operating members 13 and 14 have the same structure and are the same in the way of assembling, only the configuration relating to the operating member 13 will be described below.

The hood main cylinder 11 is a cylindrical inner cylinder with an O-shaped tip.
A filter 16 is provided so as to sandwich the ring 15. The filter 16 is fixed by screwing a filter holder 17 onto the outer periphery of the tip.

A ring-shaped stepped portion 11a is provided at the rear end of the hood main cylinder 11, and an O-ring 18 is fitted into the stepped portion 11a.

The outer diameter of the hood main cylinder 11 is a ring-shaped integrally expanded part
11b is provided, and the hood outer cylinder 12 is fitted on the outer surface between the enlarged diameter portion 11b and the rear end. The outer surface of the hood main cylinder 11 is shown in perspective in FIG. As shown in the drawing, a concave portion 11c that is long in the circumferential direction is provided near the rear end, and a quadrangular spring receiving hole 11d is provided slightly closer to the expanded diameter portion 11b than the recessed portion 11c. A chevron-shaped convex portion 11e for positioning the outer cylinder 12 is formed on the side. The bottom sloped hole communicating with the spring receiving hole 11d is provided to allow the other side to escape when the operating member 13 is operated.

The hood outer cylinder 12 has a cylindrical shape whose inner surface is joined to the outer surface of the hood main cylinder 11, and has a tube length of the hood main cylinder 11.
It is set to be slightly longer than the tube length between the rear end and the expanded diameter portion 11b. A flange 12a is formed at the rear end of the hood outer cylinder 12, and the O-ring 18 is held by the inner surface of the flange 12a. Further, the hood main cylinder 11 has a chevron shape inside the front end of the hood outer cylinder 12. The hood outer cylinder 1 is engaged with the convex portion 11e.
An engaging recess 12b for positioning 2 is provided.

A window hole 12c is formed in the hood outer cylinder 12, and the operating member 13 is located in the window hole 12c.

As described in detail in FIG. 4, the window hole 12c is a rectangular hole communicated with the rear end and is surrounded by the bank portion 12d, and the window hole 12c has the inner wall of the bank portion (circumferential direction from the rear end). Shaft stopper pieces 12e and 12f integrally formed along the two inner walls are provided so as to face each other with a predetermined length. These shaft stopper pieces 12e and 12f have such a length that they can be displaced onto the recess 11c of the hood main cylinder 11 by moving the hood outer cylinder 12 so as to position it.

As can be seen from the perspective view of FIG. 3, the operating member 13 is a rectangular plate-like member, one side of which has a locking portion (lock claw) 13a, and the other side of which has a pushing portion 13b. Pusher 13b
A spring receiving hole 13c is formed on the back surface of the.

The operation member 13 has a support shaft 13d integrally formed at a predetermined distance from the back surface and located at a lower center position.
Is fitted into the recess 11c of the hood main cylinder 11 and assembled.

Further, the operation member 13 is a seesaw with the support shaft 13d as a fulcrum, but is normally in a unidirectional turning position by receiving the expanding force of the coil spring 19.

That is, the operating member 13 is assembled to the hood main cylinder 11 and the hood outer cylinder 12 according to the steps shown in FIGS.

In this assembling step, first, the hood outer cylinder 12 is fitted from the rear end side of the hood main cylinder 11, and the claw portion 12g inside the front end of the hood outer cylinder 12 is abutted against the chevron protrusion 11e of the hood main cylinder 11. Move the hood outer cylinder 12. When fitting the hood outer cylinder 12 as described above, the recess 11c of the hood main cylinder 11
Also, circumferential alignment is required so that the spring receiving hole 11d is located in the window hole 12c of the hood outer cylinder 12.

In the above assembling step, the hood outer cylinder 12 takes the moving position shown in FIG. 5, and the tips of the shaft stopper pieces 12e and 12f (12e omitted in FIG. 5) are displaced to the position just before the recess 11c of the hood main cylinder 11. However, the recess 11c is open. In this state, the operation member 1
A coil spring 19 is interposed between the spring receiving hole 13c of 3 and the spring receiving hole 11d of the hood main cylinder 11, and the support shaft 13d is provided with a recess 11c.
To fit. In this state, the operating member 13 is the coil spring 19
Since it pops out by receiving the pressure expansion force, the pressing operation is continued so as to press the operation member 13 against the hood main cylinder 11.

By this pressing operation, the operation member 13 has one side rear surface on the shaft stopper pieces 12e and 12f, and the other side rear surface partially on the window hole 12c.
Abutting on the stepped portion 12h.

When the hood outer cylinder 12 is further moved in the above state, the claw portion 12g rides over the chevron convex portion 11e of the hood main cylinder 11, and the engaging concave portion 12b engages with the chevron convex portion 11e. 12
Is prevented from moving out, and as shown in FIG.
Is positioned. When the hood outer cylinder 12 is positioned, the shaft stopper pieces 12e and 12f are recessed in the hood main cylinder 11c.
The support shaft 13d of the operating member 13 fitted into the recess 11c is prevented from coming out upward. (Refer to the partially enlarged sectional view of FIG. 7 taken along the line AA in FIG. 6.) As a result, the operating member 13 is rotatable about the support shaft 13d as a fulcrum. Since the swiveling force in the clockwise direction in FIG. 6 is received by the expanding force, the back surface on one side is normally in the swivel position of FIG. 6 in which the shaft stopper pieces 12e and 12f of the hood outer cylinder 12 are pressed.

Also, when the hood outer cylinder 12 is positioned, its flange
Since the inner surface of 12a contacts the O-ring 18, this O-ring 1
8 is held between the stepped portion 11a of the hood main cylinder 11 and the flange 12a.

Next, the operation of the above-described mounting device will be described with reference to FIG.

This mounting device can be mounted simply by pressing the hood against the lens barrel 20. That is, when the hood is pressed, the locking portion 13a of the operation member 13 is slightly pushed up by the periphery of the lens barrel, and immediately after that, the locking portion 13a enters the locking recess 20a of the lens barrel and is locked. Therefore, as shown in FIG. 1, if the two operation members 13 and 14 are provided, the hood can be securely attached by the engagement of these engagement portions.

The hood attached in this manner is suitable for dust-proofing and waterproofing of the lens barrel as well as a light-shielding effect because the periphery of the lens barrel tip is pressed against the O-ring 18.

On the other hand, when removing the hood, the pushing portion 13 of the operating member 13
Press b.

The operating member 13 is rotated counterclockwise as shown by the tentative line in FIG. 2 by the above-mentioned pressing operation, and the locking portion 13a thereof is attached to the lens barrel 20.
Escape from the locking recess 20a.

The hood can be freely removed from the lens barrel 20 in the above state, and if the pressing operation is released, the operating member
The coil 13 is returned by the expanding force of the coil spring 19 and immediately returns to the turning position shown in FIG.

Incidentally, the ridge 11e of the hood main cylinder 11 shown in the above embodiment.
And a positioning mechanism 2 including the engaging recess 12b of the hood outer cylinder 2
As shown in FIG. 8, 1 is provided at three equally divided positions around the cylinder, and when the hood outer cylinder 12 is positioned, the rotation stopping mechanism 22 for suppressing the circumferential rotation thereof is positioned as described above. It is provided between each of the mechanisms 21. 8 is a longitudinal sectional view of the hood cut along the line BB in FIG.

The rotation stopping mechanism 22 described above is shown in FIGS. 9 (a), (b), (c).
As shown in FIG. 7, a concave portion 12i formed on the inner surface of the tip portion of the hood outer cylinder 12 and a convex shape of the hood main cylinder 11 that fits into the concave portion 12i at a predetermined rotation angle position of the hood outer cylinder 12. It is formed of the part 11f.

The positioning mechanism 21 and the rotation stopping mechanism 22 described above can be easily formed by a known means, for example, the mountain-shaped convex portion 11
It is arbitrary to provide e on the entire circumference and the engaging recess 12b to a predetermined length, and the positions and the number of these mechanisms 21 and 22 can be changed as necessary. further,
Since the operating member 13 is located in the window 12c of the hood outer cylinder 12, the rotation is stopped by the operating member 13, and as a result, the rotation stopping mechanism 22 can be omitted.

In carrying out the present invention, it is convenient that the operating members 13 and 14 can be pressed with two fingers by providing the operating members 13 and 14 at symmetrical positions around the hood as shown in FIG. However, since the present invention can be implemented as a mounting device for various similar bodies without being limited to a hood, the number of operating members and their mounting positions can be arbitrarily changed, and it is limited to a cylindrical body. Instead, the mounting device of the rectangular cylinder can be similarly implemented.

"Effects of the Invention" As described above, the mounting device according to the present invention is mounted by simply pressing the tubular body against the mounted object, and can be detached by pressing the seesaw member, and the detaching operation is extremely simple. In addition, the seesaw member is incorporated by moving and positioning the outer cylinder, does not require means such as screwing and bonding, is easy to produce as a mounting device, and has a small number of parts. Can be made cheaper.

[Brief description of drawings]

The drawings show an embodiment in which the present invention is embodied as a device for attaching a hood for a camera. FIG. 1 is a perspective view of the hood, and FIG. 2 is a partially enlarged sectional view showing a state in which the hood is attached to a lens barrel. Fig. 3 is an exploded enlarged perspective view showing the correspondence between a part of the hood main cylinder and the operating member, Fig. 4 is a partial enlarged perspective view of the hood outer cylinder, and Fig. 5 is a process of incorporating the operating member. 6 is a partially enlarged sectional view of the hood showing FIG. 6, FIG. 6 is a sectional view similar to FIG. 5 showing a state in which an operating member is incorporated, and FIG. 7 is cut along the line AA in FIG. Sectional drawing, FIG. 8 is a longitudinal sectional view of the hood cut along the line BB in FIG. 6, and FIG. 9 (a) is a partial front view showing the rotation stopping mechanism of the hood outer cylinder. Figure (b) is C- on Figure 9 (a).
A sectional view taken along line C and FIG. 9C are sectional views taken along line D-D in FIG. 9B. 11 ... Hood main cylinder, 11c ... Recessed portion 11d ... Spring receiving hole, 11e ... Angled convex portion 12 ... Hood outer cylinder, 12b ... Engagement recessed portion 12c ... Window hole 12e, 12f. Part 13 ...... Operating member, 13a ...... Locking part 13b ...... Pushing part, 13c ...... Spring receiving hole 13d ...... Spindle, 14 ...... Operating member 19 ...... Coil spring.

Claims (4)

[Claims] 1. A tubular body provided on the outer peripheral surface of an inner cylinder so as to move in the cylinder axis direction, the cylindrical body having an outer cylinder positioned at a predetermined movement position, and a window formed near the cylinder end of the outer cylinder. A recess along the inner cylinder circumferential direction, which is provided on the outer surface of the inner cylinder in the hole and is partially blocked by the outer cylinder when it is positioned, and the recess fitted before positioning the outer cylinder. The seesaw member, which has a support shaft rotatably supported by a part of the outer cylinder by its positioning, is provided in the window hole so that both sides thereof are parallel to the cylinder axis, and one side of the seesaw member. It is composed of a locking portion that is extended to the outside of the cylinder end, and an elastic force member that is provided on the other end and applies a locking force to the locking portion, and locks the locking portion. Attach the seesaw member to the seesaw against the elastic force to lock the locking part. Dividing removed configuration and the tubular body of the detachable mounting device. 2. A detachable mounting device for a tubular body according to claim 1, wherein a seesaw member similar to the above is provided at each of symmetrical positions on the periphery of the tubular body. 3. A detachable mounting device for a tubular body according to claim 1, wherein a seesaw member similar to the above is provided at each of a plurality of positions on the circumference of the tubular body. 4. The invention according to claim 1, wherein the tubular body is a camera hood, and the locking portion of the seesaw member is locked to the locking receiving portion of the camera lens barrel. A detachable mounting device for the cylindrical body.