JPH0635574Y2 - Video camera mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a video camera mounting device for slidably mounting a video camera on an upper portion of a tripod or the like.

[Outline of device]

The present invention provides a video camera mounting device having a mounting base and a slide base mounted on a lower portion of a video camera, wherein the slide base is slidably fitted on the mounting base by a guide groove and a guide rail. The clamp position and the clamping force of the clamp lever are always constant by using the clamp mechanism in which the clamp member is pressed against the cam groove or a part of the guide rail via the clamp spring by the rotation of the clamp lever. It is something that can be done.

[Prior Art] Conventionally, there is a video camera mounting device for mounting a video camera at a fixed position on a mounting base provided on an upper part of a tripod, as seen in, for example, Japanese Utility Model Laid-Open No. 59-57065. . However, this video camera mounting device cannot slide and clamp the video camera at an arbitrary position on the mounting base.

FIG. 9 shows a video camera mounting device for a tripod that has been generally used in a television studio, and is shown on a mounting base 2 provided on an upper portion of a general-purpose tripod 1.
The video camera 3 is mounted slidably in a longitudinal direction of the video camera 3 (that is, the optical axis direction of the lens) by a slide base 4 provided below the video camera 3 in the directions of arrows a and a '. It should be noted that the handle 5 is for integrally operating with the mount 2 to variably operate the elevation angle and the like of the video camera 3.

This video camera mounting device allows the center of gravity of the video camera 3 to be located on the center of the tripod 1 when the video camera 3 is changed to another model or when the lens is replaced.
The video camera 3 can be slid and clamped on the mounting base 2 at an arbitrary position.

FIG. 10 to FIG. 12 show the details of the conventional video camera mounting device, in which a guide groove 7 having a dovetail-shaped cross section (a dovetail groove) is provided on the lower surface of the slide base 4. ,
A pair of guide rails 8 having a dovetail cross section (a dovetail groove) integrally provided on the mounting base 2 are slidably fitted in the directions of the arrows a and a ', and a slide mechanism is provided by a clamp mechanism 9. 4 can be clamped at any position on the mount 2.

As shown in FIGS. 10 and 11, the clamp mechanism 9 has a wedge-shaped clamp member 11 which is vertically movable in a notch 10 provided at one side portion of the slide base 4 so as to move up and down. The rotary shaft 13 is vertically arranged in the vertical through hole 12 provided right above the notch 10 at the side portion, and the clamp lever 14 horizontally arranged on the upper part of the slide table 4 is provided on the upper end of the rotary shaft 13 as the serration 13a. Therefore, a male screw 15 that is fixedly attached and formed on the outer periphery of the lower end side of the rotary shaft 13 is screwed into a female screw hole 16 that vertically penetrates through the central portion of the clamp member 11. And
The clamp lever 14 is rotated in the direction of the arrow b from the unclamped position shown by the one-dot chain line in FIG. 10 to the clamp position shown by the solid line, and is rotated in the same direction as the clamp lever 14 by the male screw 15 of the rotary shaft 13. By the feeding action, the clamp member 11 is raised in the direction of arrow c from the unclamped position shown by the one-dot chain line in FIG. 11 to the clamp position shown by the solid line, and the slope 11a of the clamp member 11 becomes the slope of the guide rail 8. 8a
The slide base 4 is clamped at an arbitrary position on the mounting base 2 by being crimped by a wedge action to a part of the base.

In addition, as shown in FIG. 10, on the mounting base 2, the direction of fitting the slide base 4 to the pair of guide rails 8 (arrow a).
Direction) and the withdrawal direction (arrow a'direction) at both ends thereof, a pair of stoppers 17 and 18 for preventing the slide base 4 from falling off the mounting base 2 are provided. And one stopper
As shown in FIG. 12, the reference numeral 18 is arranged in the vertical through hole 19 provided in the mounting base 2 so as to be retractable in the directions of arrows d and d ′.
The spring 20 is biased to project in the direction of arrow d. Then, when the slide base 4 is fitted to the pair of guide rails 8 in the direction of arrow a, or when the slide base 4 is pulled out in the direction of arrow a ′,
The stopper 18 is pushed down against the spring 20 in the direction of arrow d'with a fingertip.

[Problems to be solved by the device]

However, the conventional video camera mounting device cannot make the positions of the male screw 15 of the rotary shaft 13 and the screw threads of the female screw 16 of the clamp member 11 constant in processing, and finely adjusts the fixing position of the clamp lever 14 to the rotary shaft 13. Therefore, when the slide base 4 is clamped, the clamp lever 14 cannot be stopped at the constant clamp position shown by the solid line in FIG. For this reason,
It is difficult to clearly discriminate whether the clamp member 11 is in the clamp position shown by the solid line in FIG. 11 or the clamp release position shown by the one-dot chain line by the position of the clamp lever 14 in the directions of the arrows b and b ′. When the slide base 4 is fitted to the pair of guide rails 8 in the direction of the arrow a, the clamp member 11 can easily hit the guide rails 8 and the fitting operation of the slide base 4 on the mounting base 2 cannot be performed easily. It was

Further, the clamp force when the clamp member 11 is crimped to the slope 8a of the guide rail 8 depends on the input for rotating the clamp lever 14 in the direction of the arrow b. Therefore, the clamp force cannot be controlled and the clamp force is insufficient. In that case, an accident such that the video camera 3 unexpectedly slides on the mount 2 during shooting is likely to occur.

In addition, when the slide base 4 is clamped, the clamp lever 14 is projected to one side of the mounting base 2 at a substantially right angle as shown by the solid line in FIG.
A person or various members unexpectedly collide with the clamp lever 14,
There is a problem in that the clamp of the slide base 4 is likely to be unintentionally released due to easy rotation in the direction of the arrow b'which is the release direction of the clamp.

It is an object of the present invention to provide a video camera mounting device which can always hold a clamp position and a clamp force of a clamp lever.

[Means for Solving the Problems]

In order to achieve the above object, the video camera mounting apparatus of the present invention comprises a clamp mechanism for clamping a slide base at an arbitrary position on the mounting base, an elevating shaft mounted on the mounting base so as to be movable up and down, and a lifting mechanism. A clamp member that moves up and down together with the shaft and is crimped or separated from a part of the guide groove or the guide rail, a clamp lever rotatably provided within a fixed angle on the outer circumference of the lift shaft, and a rotation of the clamp lever. Thus, the lifting shaft is configured by a cam mechanism that controls lifting by a clamp spring.

[Action]

In the video camera mounting device configured as described above, the cam mechanism is operated by the rotation operation of the clamp lever within a fixed angle, and the cam mechanism causes the lifting shaft and the integral body with the lifting shaft via the clamp spring. The clamp member is controlled to move up and down, and the spring force of the clamp spring presses the clamp member against a part of the guide groove or the guide rail to clamp the slide base on the mounting base. Therefore, since the clamp lever only operates the cam mechanism, the clamp position of the clamp lever can always be kept constant. Further, a constant clamping force can always be obtained by the clamp spring, irrespective of the human force which is the rotational operation force of the clamp lever.

〔Example〕

An embodiment of a video camera mounting device for a tripod to which the present invention is applied will be described below with reference to FIGS. The same structural parts as those in the conventional example shown in FIGS. 9 and 10 are designated by the same reference numerals, and the description thereof is omitted.

First, the clamp mechanism 2 mounted on the mounting base 2 will be described.

An up-and-down shaft 24 that vertically penetrates through an up-and-down through hole 23 provided on one side of the mounting base 2 is arranged so as to be vertically movable in the directions of arrows e and e '.

A wedge-shaped clamp member 26 is arranged in a notch 25 provided on one side of one guide rail 8 so as to be vertically movable in the directions of arrows e and e '. A male screw 27 formed on the outer periphery of the upper end of the elevating shaft 24 is screwed into a female screw hole 28 provided in the central portion of the clamp member 26 to integrally couple the clamp member 26 to the elevating shaft 24.

A return spring composed of a plurality of disc springs fitted to the outer periphery of the lifting shaft 24 in a recess 29 provided in the upper portion of the vertical through hole 23 of the mounting base 2.
The lifting shaft 24 and the clamp member 26 are urged upward by the arrow 30 in the direction of arrow e.

A clamp lever 31 is arranged below the mount 2 on the outer periphery of the elevating shaft 24 so as to be rotatable in the directions of arrows f and f ′ at a constant angle θ ₁ .

A cam mechanism 33 is arranged in a recess 32 provided in the lower portion of the vertical through hole 23 of the mounting base 2. This cam mechanism 33 is a lifting shaft
A disk-shaped cam fixing side 35 that is fitted to the outer periphery of 24 and fixed to the upper side of the recess 32 by a parallel pin 34 in a non-rotating state, and an outer periphery of the lifting shaft 24 that is fixed to the upper surface of the clamp lever 31. And a cylindrical cam movable side 36 that is rotatable below the lift shaft 24 and is arranged below the recess 32 so as to be able to move up and down in the directions of arrows e and e ', and a cam fixed side. 35 and three sets of cam grooves 37 and 38 formed in a spiral shape along the outer periphery of the lifting shaft 24 provided on the vertically opposing surfaces of the cam movable side 36.
It is constituted by three rotating balls 39 rotatably arranged between the pair of cam grooves 37, 38. As shown in FIG. 5, the cam grooves 37 and 38, which are opposed to each other from above and below, are formed symmetrically with respect to the directions of arrows f and f ′, which are the rotation directions of the elevating shaft 24. Both ends of the grooves 37, 38 are formed into deep recesses 37a, 37b and shallow recesses 38a, 38b for the click of the rotating ball 39.

A thrust bearing 41 is fitted to the outer periphery of the lifting shaft 24 at the upper side of a cylindrical recess 40 provided on the lower side of the cam movable side 36, and the thrust bearing 41 and the lifting shaft at the lower side of the recess 40.
A clamp spring 42 made up of a plurality of disc springs is arranged between the lower end of 24 and the large diameter portion 24a, and is fitted to the outer periphery of the lifting shaft 24. A driver engaging portion 43 such as a hexagonal hole is provided on the lower end surface of the elevating shaft 24.

The clamp mechanism 22 is configured as described above, and is shown in FIG.
As shown by the solid lines in FIGS. 4 and 6, the clamp lever 31
Notch 4 with the knob 31a at the tip of the
The position attached to the outside of 4 is the clamp release position P ₁ of the clamp lever 31, and the knob 31a of the clamp lever 31 is notched as shown by the one-dot chain line in FIGS. 1, 4, and 6. The position where it is inserted into 44 is the clamp position P ₂ of the clamp lever 31. Then, when the clamp lever 31 is in the unclamping position P ₁ , the rotary balls 39 enter into the deep recesses 37a, 38a for clicks on one end side of the cam grooves 37, 38 as shown by the solid lines in FIG. The clamp lever 31 is positioned at the clamp release position P ₁ . Then, when the clamp lever 31 is positioned at the clamp release position, as shown by the solid line in FIGS.
26 and 26 are pushed up in the direction of arrow e to the clamp release position.

Then, when the clamp lever 31 is rotated from the clamp release position P ₁ to the clamp position P _{2 in the} direction of arrow f, the cam movable side 36 of the cam mechanism 33 is integrally rotated with the clamp lever 31 in the same direction. Then, as shown by the one-dot chain line in FIG.
Each rotation ball 39 slips out from the deep recesses 37a, 38a for click on one end side of each cam groove 37, 38, enters into the shallow recesses 37b, 38b for click on the other end side, and is positioned, and the clamp lever 31 is positioned. Positioned at clamp position P ₂ . And
By the movement of the rotary balls 39 in the cam grooves 37, 38, the cam movable side 36 is rotated in the direction of arrow f, and is lowered by the height H ₁ shown in FIG. 5 in the direction of arrow e ′. The descending force (axial force) passes through the thrust bearing 41 and the clamp spring
By being transmitted to 42, the clamp spring 42 is pressed in the direction of arrow e ′. Since the clamp spring 42 pushes down the elevating shaft 24 in the direction of the arrow e'through the large diameter portion 24a, the elevating shaft 24 and the clamp member 26 are integrally formed by the clamp spring 42 as shown in FIGS. figure by a height H ₂ to clamping position shown by the one-dot chain line from the clamp release position shown by the solid line pushed down in the arrow e 'direction, the slope 26a of the clamp member 26 is a guide groove 7
The slide base 4 is clamped at a desired position on the mounting base 2 by being crimped to a part of the sloped surface 7a by a wedge action.

That is, the descending amount H ₁ of the cam movable side 36 is larger than the descending amount H ₂ of the clamp member 26, the clamp spring 42 bends by the difference between the descending amounts H ₁ and H _2, and the clamp force is applied to the clamp spring 42. Element
The slope 26a of 26 is pressed against the slope 7a of the guide groove 7.

According to the clamp mechanism 22, the clamp lever
Since 31 only operates the cam mechanism 33, the clamp lever 31 can be accurately rotated within a constant angle θ ₁ , and the clamp position P ₂ and the clamp release position P ₁ of the clamp lever 31 are always constant. You can At this time, each cam groove 3
Click dents 37a, 37b and 3 on the rotating ball 39 at both ends of 7, 38
By providing 8a and 38b, the clamp lever 31 can be click-positioned at the clamp position P ₂ and the clamp release position P ₁ .

Further, a constant clamping force can always be obtained by the clamp spring 42 regardless of the human force which is the rotational operation force of the clamp lever 31 in the arrow f direction. Then, the spring force of the clamp spring 42, which is the clamping force, can be easily adjusted. That is,
In a clamped state in which the slope 26a of the clamp member 26 is crimped to the slope 7a of the guide groove 7, a torque driver is engaged with the driver engaging portion 43 of the lower end surface of the elevating shaft 24, and the elevating shaft 24 is moved by the torque driver. When the rotation is adjusted, the clamp member 26 in the notch 25 is vertically adjusted with respect to the elevating shaft 24 by the screw feeding action of the male screw 27, and the spring force of the clamp spring 42 is easily adjusted.

Further, since the thrust bearing 41 interposed between the cam movable side 36 and the clamp spring 42 does not transmit the rotational force of the clamp lever 31 to the elevating shaft 24, the clamp lever 31 causes the male screw 27 of the elevating shaft 24 to unexpectedly occur. Rotated, clamp spring 42
The clamping force of the clamp lever is not affected, and the thrust bearing 41 prevents the clamp lever from
It is possible to smoothly rotate 31 in the directions of arrows f and f '.

Next, the movable stopper 46 and the safety lever 47 mounted on the mounting base 2 will be described.

The stopper 46 is composed of a rotating lever, and the mounting base 2
1, a stopper 46 is rotatably mounted via a fulcrum shaft 49 in a vertical slot 48 shown in FIG. 8 provided at the end portion on the arrow a'direction side. This Stopper 46
Is configured to be rotatable in the directions of arrows g and g'between the operating position shown by the solid line in FIG. 8 and the releasing position shown by the one-dot chain line, and is rotated by the return spring 50 in the direction of the arrow g'to the operating position. Being energized. The upper protrusion 46a provided at the upper end of the stopper 46 is projected upward from the slit 48 above the mounting base 2 by the biasing force of the stopper 46, and the protrusion 51 provided on the lower surface of the guide groove 7 of the slide base 4 is provided. Is configured to interfere with. A lower protrusion 46b provided on the lower portion of the stopper 46 projects from the slit 48 below the mounting base 2.

The safety lever 47 is rotatably mounted on the lower surface of the mounting base 2 at a position near the clamp position P ₂ of the clamp lever 31 via a fulcrum shaft 53. This safety lever 47 has arrows h, h'between the clamp lever locking position P ₃ shown by the solid line in FIG. ₄ and the stopper operating position P ₄ shown by the two-dot chain line.
It is configured to be rotatable in any direction. Then, one end of the safety lever 47 has a substantially hook-shaped locking portion 47a for locking the locking pin 54 provided on the clamp lever 31.
Is integrally provided, and an operating portion 47b for releasing the stopper 46 is integrally provided at the other end side. On the bottom surface of the mounting base 2, the operation portion 47b of the safety lever 47 and the stopper 4 are provided.
An intermediate lever 55 is rotatably attached to the lower projection 46b of 6 through a fulcrum shaft 56 in the directions of arrows i and i ', and an operating portion 46
b and the intermediate lever 55 are interlocked with each other through the long hole 57 and the pin 58. Then, the safety lever 47 is rotationally biased by the return spring 59 in the arrow i'direction, and in conjunction with this, the intermediate lever 55 is rotationally biased in the arrow i'direction.

The stopper 46 is constructed as described above, and when the slide base 4 is fitted to the pair of guide rails 8 on the mounting base 2 in the direction of arrow a in FIG. 1, as shown in FIG. The projection 51 of No. 4 is brought into contact with the slope 46c provided on one side surface of the upper projection 46a of the stopper 46 in the operating position to rotate the stopper 46 against the return spring 50 in the direction of the arrow g toward the release position. Let it escape. Therefore, the protrusion 51 is the upper protrusion 46a.
Can be passed in the direction of arrow a without any trouble.

However, at the same time when the projection 51 passes over the upper projection 46a in the direction of the arrow a, the stopper 46 is returned to the operating position by the return spring 50 in the direction of the arrow g ', and the slide base 4 is moved to a pair on the mounting base 2. From the guide rail 8 to the arrow a'in FIG.
When the upper projection 46a is abutted against the vertical surface 46d provided on the other side surface of the upper projection 46a, the stop 51
6 prevents the slide base 4 from falling off in the direction of arrow a '.

On the other hand, the safety lever 47 is also configured as described above, and when the clamp lever 31 is rotated in the direction of arrow f to the clamp position P ₂ shown by the one-dot chain line in FIGS. 4 and 6,
Pin 54 of clamp lever 31 is clamp lever locked position
While contacting the end surface 47c of the lock portion 47a of the safety lever 47 at P ₃ , the safety lever 47 is rotated in the direction of arrow h against the return spring 59, the return lever 59 causes the safety lever 47 to move. The pin 54 is automatically pulled into the recess 47d of the lock portion 47a by the restoring force in the direction of the arrow h ', and the clamp lever 31 is automatically locked at the clamp position P ₂ by the safety lever 47. To be done.

After this locking, the clamp lever 31 cannot rotate unexpectedly in the direction of arrow f ', which is the direction of releasing the clamp.

With the clamp lever 31 in the locked state, as shown in FIGS. 4 and 6, the knob 47e of the safety lever 47 is pressed.
Is projected outward from the knob 31a of the clamp lever 31, so if the knob 47e is pushed in the direction of the arrow h, the lock portion 47a is disengaged from the pin 54, the lock of the clamp lever 31 is released, and the clamp lever 31a is released. Can be rotated in the direction of arrow f'to the unclamped position. At this time, the rotation angle of the safety lever 47 in the arrow h direction required for unlocking the clamp lever 31 is small, and the stopper 46 is not operated at this rotation angle of the safety lever 47. In addition, since the knobs 47e and 31a of both the safety lever 47 and the clamp lever 31 are arranged close to each other, the two fingers can be used to move the knobs 47e and 31a to the opposite direction of the arrow h. By pushing in the direction of the arrow f ', the clamp lever 31 can be rotated in the lock release direction by one-touch at the same time as the lock release of the clamp lever 31, and the operability is very good.

Next, when the slide base 4 is pulled out from the pair of guide rails 8 on the mounting base 2 in the direction of arrow a'in FIG. 1, the safety lever 47 is clamped by the solid line in FIGS. 4 and 7. When the lever lock position P ₃ is rotated in the direction of arrow h against the return spring 59 from the stopper operation position P ₄ shown by the chain double-dashed line, the operation portion 47b of the safety lever 47 rotates in the direction of arrow i. The intermediate lever 55 comes into contact with the lower projection 46b of the stopper 46 and moves the stopper 46 from the operating position shown by the solid line in FIG. 8 to the release position shown by the one-dot chain line against the return spring 50 in the direction of arrow g. Can be operated.

Therefore, the release of the stopper 46 can be remotely operated with one hand by the safety lever 47, and the video camera can be supported by the other hand and detached from the mount 2.

Since the rotation angle required for unlocking the clamp lever 31 by the safety lever 47 does not overlap with the rotation angle required for releasing the stopper 46, these two releasing operations can be performed by the two-step motion of the safety lever 47. Each can be done independently and easily and reliably.

The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various effective modifications can be made based on the technical idea of the present invention.

For example, in the embodiment, the guide rail 8 is provided on the mounting base 2,
Although the guide groove 7 is provided in the slide base 4 and the clamp member 26 is configured to be crimped to the guide groove 7 of the slide base 4, the guide groove 7 is provided in the mounting base 2 and the guide rail is provided in the slide base 4. The clamp member 26 may be configured to be crimped to the guide rail 8 of the slide base 4.

Further, in the embodiment, the clamp member 26 is configured to be pushed downward, but the clamp member 26 is pushed upward by the cam mechanism 33 and the clamp spring 42 so that the guide groove 7 or the guide rail 8 of the slide base 4 is guided. It can also be configured to be crimped.

Further, although the cam mechanism 33 having the rotating ball 39 is used in the embodiment, the cam mechanism having other various structures may be used.

Further, the present invention allows the video camera to be mounted on a mounting base provided on a tripod or other various mounting devices.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

Since the clamp position of the clamp lever can always be made constant, whether the clamp member is in the clamp position or the clamp release position can be clearly discriminated by the clamp position of the clamp lever. Therefore, when the slide base is fitted to the mounting base, the clamp member does not rattle against the guide rail or the like, and the slide base can be easily fitted.

Since a constant clamping force is always obtained by the clamp spring, it is easy to control the clamping force and the slide base can be stably clamped on the mounting base. Therefore, it is possible to prevent an accident in which the video camera unexpectedly slides on the mount during shooting due to insufficient clamping force.

Since the clamp position of the clamp lever can always be made constant, when the slide base is clamped, the clamp lever can be stably arranged at a position where a person or various members are unlikely to accidentally collide. Therefore, it is possible to prevent an accident such that a person or various members accidentally collide with the clamp lever during photography and the clamp of the slide base is unexpectedly released.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is a perspective view showing a mounting base and a slide base, FIG. 2 is an exploded perspective view of a main part, and FIG. The figure is a sectional view of the clamp mechanism taken along the line III-III in FIG. 1, FIG. 4 is a bottom view showing the clamp lever, the safety lever, and the stopper part, and FIG. 5 is a main part of the cam mechanism. FIG. 6 is a perspective view illustrating a clamping operation, FIG. 7 is a perspective view illustrating a stopper releasing operation, and FIG. 8 is a perspective view illustrating a stopper portion, taken along arrows VIII-VIII in FIG. 1. FIG. 9 to 12 show a conventional example, FIG. 9 is a perspective view of the entire mounting device, FIG. 10 is a perspective view showing a mounting base and a slide base, and FIG. 11 is a perspective view. 10 is a sectional view taken along the line XI-XI in FIG. 10, and FIG. 12 is a sectional view taken along the line XII-XII in FIG. In the reference numerals used in the drawings, 2 ... Mounting base 3 ... Video camera 4 ... Slide base 7 ... Guide groove 8 ... Guide rail 22 ... Clamping mechanism 24 ... Lifting shaft 26 ... Clamping member 31 …… Clamp lever 33 …… Cam mechanism 42 …… Clamp spring.

Claims (1)

[Scope of utility model registration request] 1. A video camera mounting having a mounting base and a slide base mounted on a lower portion of the video camera, wherein the slide base is slidably fitted on the mounting base by a guide groove and a guide rail. In the device, a clamp mechanism that clamps the slide base at an arbitrary position on the mounting base is provided with an elevating shaft that is mounted on the mounting base so as to be vertically movable, and is vertically moved together with the elevating shaft so that the guide groove or the guide is formed. A clamp member that is crimped or separated from a part of the rail, a clamp lever that is rotatably provided within the outer periphery of the elevating shaft within a certain angle, and rotation of the clamp lever causes the elevating shaft to pass through a clamp spring. A video camera mounting device characterized in that it is configured by a cam mechanism that controls vertical movement.