JPS5932785Y2 - Pan head - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pan head used for a VTR camera, a 16 mm movie camera, a large camera, etc.

Generally, pan heads used for heavy cameras such as VTR cameras, 16mm movie cameras, and large cameras have a spring interposed between the front and rear tilting base and the base, so that the front and rear tilting base can be tilted forward or backward. It is configured to provide a restoring force that returns it to a neutral position in the event of an accident.

The restoring force of this spring balances the weight of these cameras, which are heavy and have a high center of gravity, and provides an appropriate restoring force to provide a good operating feel.In addition, it is possible to attach a long focal length lens. The lens is constructed to prevent damage to the lens due to the weight of the lens causing the camera to inadvertently tilt forward.

Conventionally, torsion coil springs have been frequently used to provide this kind of restoring force because they have a simple structure and can be made compact, and these torsion coil springs are in a free state when the longitudinal tilting table is in a neutral state. The belt is mounted in such a manner that it is deformed in both the loosening direction and the tightening direction by tilting the front and rear tilting table forward and backward, thereby providing a restoring force.

However, it is generally difficult to make the spring constant of a torsion coil spring equal when it is deformed in the loosening direction and when it is deformed in the tightening direction.

For this reason, there is a difference in the restoring force between when the back-and-forth tilting table is tilted forward and when it is tilted backward, resulting in problems such as poor balance and poor operating feel.

The present invention was developed based on the above circumstances, and its purpose is to simplify and downsize the structure by using torsion coil springs, and to make the structure easier and smaller when the back-and-forth tilting table is tilted forward and backward. The purpose of the present invention is to provide a pan head that can equalize the restoring forces of the two and provide good balance and operational feeling.

Hereinafter, the present invention will be explained according to an embodiment shown in the drawings.

In the figure, reference numeral 1 denotes a base, and a back-and-forth tilting table 2 is attached to this base 1 so as to be able to freely tilt forward and backward, and the base 1 is configured to be attached to a tripod or the like.

Further, a camera mounting portion 3 is formed at the upper end of the fore-and-aft tilting table 2, and a camera is configured to be mounted on this camera mounting portion 3.

Note that 4 is a camera mounting screw.

The base 1 is composed of a vertical shaft member 5 and a horizontal shaft member 6.

A disk-shaped mounting base 7 for mounting the vertical shaft member 5 on a tripod or the like is provided at the lower end of the vertical shaft member 5, and a shaft portion 8 is formed at the middle and upper ends of the vertical shaft member 5. There is.

Further, the horizontal shaft member 6 has a cylindrical shape, and a fitting hole 9 is formed in the center of the horizontal shaft member 6 so as to be perpendicular to the axial direction of the horizontal shaft portion 6 .

The shaft portion 8 of the vertical shaft member 5 is rotatably fitted into the fitting hole 9, and the horizontal shaft member 6 rotates within a horizontal plane around the shaft portion 8 of the vertical shaft member 5. It is free.

Further, a thread 10 is formed along the central axis at one end of the horizontal shaft member 6, for example, the left end when facing forward, and this thread 10 reaches the fitting hole 9.

A spring holding member 11 that prevents the torsion coil spring from being removed, which will be described later, is screwed onto this thread 10.

The spring holding member 11 has a screw thread 12 along its central axis.
is formed.

A cylindrical suppressing member 13 made of a relatively soft material such as brass is inserted into the screw 12, and a fixing screw 14 is screwed into the screw 12 from above.

Then, by tightening this fixing screw 14, the pressing member 13 is pressed, and this pressing member 13 is pushed into the fitting hole 9.
It is configured such that it is pressed against the circumferential surface of the shaft portion 8 of the vertical shaft member 5 fitted therein, and the horizontal rotation of the horizontal shaft member 6 can be fixed by the frictional force.

Incidentally, reference numeral 15 indicates a locking screw that prevents the vertical shaft member 5 from being removed.

Further, a pair of annular fitting ears 16.degree. 16 are formed on both sides of the flat end of the longitudinally tilting table 2.

Both ends of the horizontal shaft member 6 are rotatably fitted into these fitting ears 16, 16, and the back and forth tilting table 2 can be tilted forward and backward around the horizontal shaft member 6. It can be tilted freely.

On the other hand, for example, a cut 17 is provided in a part of the left fitting ear 16, and a tightening screw 18 is threaded through the cut 17.

Then, by tightening this tightening screw 18, the cut 1
As the gap 7 decreases and the diameter of the fitting ear 16 increases, the horizontal shaft member 6 is pressed against the horizontal shaft member 6, and the longitudinal tilting movement of the longitudinal tilting table 2 can be fixed by the friction thereof.

Torsion coil springs 19 and 20 are attached to both ends of the horizontal shaft member 6.

These torsion coil springs 19 and 20 are arranged concentrically with the horizontal shaft member 6 so as to face the end face of the same.

Each of these torsion coil springs 19 and 20 has a pair of legs 21 that protrude in the tangential direction, and the tips of these legs 21 are bent in the axial direction of the horizontal shaft member 6. ing.

Attachment holes 22 are formed in the end surface of the horizontal shaft member 6 and the side surface of the back-and-forth tilting table 2 in correspondence with the leg portions 21 of the torsion coil springs 19 and 20, respectively.

Hollow cylindrical bushings 23 made of synthetic resin material are fitted into these mounting holes 22.
The leg portions 21 of the torsion coil springs 19, 20 are fitted into these bushes 23.

When the back-and-forth tilting table 2 is tilted forward or backward, these torsion coil springs 19 and 20 are deformed and are configured to provide a restoring force to return the back-and-forth tilting table 2 to the neutral position. .

The torsion coil springs 19 and 20 are attached in such a manner that, for example, the front leg 21 of the left torsion coil spring 19 is attached to the longitudinal tilting table 2, and the rear leg 21 is attached to the horizontal shaft member 6. In contrast, when the torsion coil spring 20 on the right side has the front leg 21 attached to the horizontal shaft member 6
The rear leg portion 21 is attached to the back-and-forth tilting table 2.

Therefore, when the longitudinal tilting table 2 is tilted forward, the left torsion coil spring 19 is deformed in the loosening direction, but the right torsion coil spring 20 is deformed in the tightening direction, and the longitudinal tilting table 2 is tilted backward. In this case, the left torsion coil spring 19
is deformed in the tightening direction, but the right torsion coil spring 20 is configured to deform in the loosening direction.

The left torsion coil spring 19 is prevented from being pulled out in the axial direction by the flange 24 of the spring pressing member 11 described above.

In addition, a spring storage cap 25 is provided on the right side of the front and rear tilting table 2.
The torsion coil spring 20 on the right side is housed in this spring housing cap 25 and is prevented from being removed.

This splash storage cap 25 has a circular shape, and is connected to the front and back by a plurality of mounting screws 27 that pass through a flange portion 26 that protrudes from the periphery of the cap and are screwed into the side surface of the front and rear tilting table 2. It is attached to the tilting table 2.

A spring accommodating recess 28 is formed in the spring accommodating cap 25, and the right torsion coil spring 20 is accommodated in the spring accommodating recess 28.

Further, a guide shaft portion 29 is provided protrudingly within this spring housing recess 28, and this guide shaft portion 29 is connected to the right torsion coil spring 20.
It is loosely inserted inside.

Additionally, a notch 3 is provided at the peripheral edge of the splash storage cap 25.
0 is formed, and the rear leg portion 21 of the right torsion coil spring 20 is led out from this notch portion 30 and attached to the back and forth tilting table 2.

A bread bar attachment portion 31 is provided on the side end surface of this splash storage cap 25.

This bread stick attachment part 31 is formed with an insertion slot into which the shaft part 33 of the bread stick 32 is inserted, and a cut 35 that reaches the insertion hole 34 along the axial direction of the insertion hole 34 is provided. There is.

A tightening screw 36 is provided passing through this cut 35, and by loosening this tightening screw 36, the bread bar 32 can be inserted and removed, and it can also be slid or rotated in the axial direction. By tightening this tightening screw 36, the bread bar 32 can be fixed at an arbitrary position.

Further, the shaft portion 33 of this bread stick 32 is bent at its middle portion, and by rotating this bread stick 32, the position of the grip portion 36 of this bread stick 32 with respect to the pan head can be adjusted. ing.

One embodiment of the present invention configured as described above is a front and rear tilting table 2.
When the torsion coil spring 19 is tilted forward or backward,
20 is deformed, and a restoring force is applied to return the back-and-forth tilting table 2 to the neutral position.

This restoring force offsets the weight of the camera, giving the back-and-forth tilting table 2 a characteristic that returns to the neutral position even if the hand is released from the pan rod 32, and providing an appropriate restoring force allows for good operation. You can get sex.

These torsion coil springs 19 and 20 are used as a pair, and their deformation directions in the winding loosening direction and winding tightening direction are opposite to each other with respect to the forward or backward tilting of the front and rear tilting table 2. Even if there is a difference in the spring constants of the torsion coil springs 19, 20 in the loosening direction and the tightening direction, these differences cancel each other out.

Therefore, the restoring force is equal when the back-and-forth tilting table 2 is tilted forward and when it is tilted backward, and a good operational feeling can be obtained.

In addition, in this embodiment, synthetic resin bushings 23 are attached to the mounting parts of the legs 21 of the torsion coil springs 19, 20.
... is interposed, so that rattling can be prevented, and abnormal noise due to metal-to-metal contact can be prevented, and problems such as the microphone of the VTR camera picking up this abnormal noise can be prevented.

Further, a spring housing cap 25 is provided on the side surface of the front-rear tilting table 2 to prevent the torsion coil spring 20 from being removed, and a bread bar mounting portion 31 is formed on the outer surface of this spring housing cap 25. Since I installed this bread stick 3
2 is placed away from the center of the pan head, this pan rod 32 is placed away from the center of the photographer's body, improving operability.

Note that the present invention is not limited to the above embodiment.

For example, the configurations of the base and the back-and-forth tilting table are not necessarily limited to those of the above embodiment.

Furthermore, the mounting structure for the leg portions of the torsion coil spring, the structure for preventing the torsion coil spring from coming off, etc. are not necessarily limited to the one embodiment described above.

As mentioned above, one embodiment of the present invention provides a restoring force to the front-back tilting table and uses a pair of torsion coil springs whose deformation directions in the loosening direction and the tightening direction are opposite to each other with respect to forward and backward tilting. It was established.

Therefore, even if there is a difference in the spring constant between the loosening direction and the tightening direction of the torsion coil spring, these differences cancel each other out,
The restoring force is the same when the back-and-forth tilting table is tilted forward and backward, and good operability is obtained.Moreover, since this table is simply equipped with a pair of torsion coil springs, the structure is simple. It is simple and can be miniaturized, which has great effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view seen from the left, Fig. 2 is a perspective view seen from the right, Fig. 3 is an exploded perspective view, and Fig. 4 shows main parts. FIG. 1...Base, 2...Front and back tilting table, 5.
...Vertical shaft member, 6...Horizontal shaft member, 1
9, 20... Torsion coil spring, 21...
...Legs, 22...Mounting holes, 23...
Bush, 25...Spring accommodation cap, 31.
...Bread stick attachment part, 32...Bread stick.

Claims (1)

[Scope of utility model registration request] A base, a back-and-forth tilting table attached to the base so as to be able to freely tilt forward and backward, and legs attached to the base and the back-and-forth tilting table, respectively, and when the back and forth tilting table is tilted forward, the legs can be tilted forward and backward. The torsion coil spring deforms in the loosening direction and then deforms in the tightening direction when tilted backwards, and the legs are respectively attached to the base side and the front-back tilting table side, and when the tilting table tilts forward, the torsion coil spring deforms in the tightening direction. 1. A pan head characterized by comprising a torsion coil spring that is deformed in the direction of winding loosening when tilted.