JPH0868493A - Camera crane - Google Patents

Abstract

PURPOSE: To eliminate such danger as to get a hand caught at the time of the up-down operation of an arm by installing a rotary shaft along the arm, and engaging bevel gears, provided at both ends of the rotary shaft, respectively with bevel gears provided at a support and a camera fitting part to control the attitude of the camera fitting part. CONSTITUTION: An arm 2 pivotally supported to a support 1 is fitted with a camera fitting part 3 at the tip, and a balance weight 4 at the rear end. Inside the arm 2 of hollow cylindrical structure, a rotary shaft is installed along the arm 2. One of large bevel gears 18 engaged with small bevel gears 17 fitted to both ends of the rotary shaft is fixed to the support 1, and the other is fixed to the camera fitting part 3 pivotally fixed to the tip of the arm 2. The attitude control of the camera fitting part 3 is performed by the rotary shaft enclosed in the arm 2 and the bevel gears 17, 18 at both ends. There is thereby no such danger as to get a hand caught by the up-down operation of the arm 2 while enabling compactness and light weight as a camera crane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera crane equipped with a television camera or the like and capable of arbitrarily setting a photographing position (height) thereof, in which an arm pivotally supported by a support is raised and the camera is attached to the tip of the arm. The present invention relates to a camera crane equipped with a mounting part.

[0002]

2. Description of the Related Art Since a television camera and the like are mounted on a pan head installed in a camera mounting portion, it is necessary that the camera mounting portion always has the same posture regardless of the elevation angle of the arm. A conventional camera crane generally has a structure shown in FIG. That is, the parallel bar 10 is parallel to the arm 101.
2 is provided, a parallelogram link is formed between the support 103 and the camera mount 104, and the position of the camera mount is controlled by always making the link equivalent of the camera mount 104 parallel to the link corresponding to the support 103. It is carried out. In addition, 105 is a platform, 106 is a camera, 107 is a balance weight.

A part of the camera crane shown in FIG. 7 has also been put to practical use. That is, a pulley 109 having the same diameter as the pulley 108 fixed to the column 103 is pivotally attached to the arm tip, and the camera mounting portion 104 is fixed to this pulley 109. Pulleys 108 and 109 are chained or toothed belt 1
Connected at 10, this has the same effect as the parallel bar 102 of FIG. The arm 101 in FIG. 7 has a hollow cylindrical shape,
Pulleys 108, 109 and chains or belts 110
It has a structure to store in it.

[0004]

In the parallelogram link as shown in FIG. 6, when the depression angle of the arm is increased, the distance between the arm 101 and the parallel bar 102 becomes narrower, and finally interference occurs. There is a risk of pinching your hand if you are restricted or if you are raising or lowering with your hand on the arm. Therefore, the arm 101 and the parallel bar 102 need to be spaced to some extent, which hinders the downsizing of the crane. Even in the structure of FIG. 7, the pulleys 108 and 109 need to have a certain diameter, which is an obstacle to downsizing.

When the camera crane is transported or stored, inconvenience often occurs due to the long arm.
For this reason, the arm is shortened or divided during transportation and storage, and is assembled and lengthened during use.
However, the structures shown in FIGS. 6 and 7 require time and labor for disassembly and assembly, and require adjustment for attitude control of the camera mounting portion after assembly for lengthening.

[0006]

A rotary shaft is installed along an arm in a hollow cylindrical structure arm, and one of large bevel gears engaging with small bevel gears attached to both ends of the rotary shaft is fixed to a column. , The other is fixed to the camera mounting part pivotally attached to the tip of the arm. The arm has a small-diameter tube inserted into a large-diameter tube and can expand and contract, and the rotating shaft has a structure that expands and contracts to transmit rotation by the tube, the round bar inserted into it, and the spline joint.

[0007]

[Operation] If the tooth ratio of the bevel gears engaged on the column side is the same as the tooth number ratio of the bevel gears engaged on the camera mounting side, the large bevel gear on the column side is fixed to the column and does not rotate. Therefore, the large bevel gear fixed to the camera mounting portion also does not rotate relatively, and therefore the camera mounting portion maintains the same posture regardless of the depression / elevation angle of the arm. Further, even if the arm and the rotary shaft are expanded and contracted, the rotation of the rotary shaft is transmitted as it is, so that the posture of the camera mounting portion is maintained as it is.

[0008]

EXAMPLES The details of the present invention will be described with reference to examples. FIG. 1 shows a camera crane according to the present invention. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 4 is a sectional view taken along the line CC of FIG. The arm 2 pivotally supported by the column 1 has a camera mount 3 at its tip and a balance weight 4 at its rear end to form a camera crane. The column 1 is installed on the rotating base 5, and the elevation and turning of the am 2 are performed. Reference numeral 6 is a mounting bracket for installing the camera crane on a tripod or on a base of a mobile carriage.

The arm 2 is composed of an arm intermediate member 7, a tubular camera side arm 8, a weight side arm 9 and a small diameter telescopic arm 10. The telescopic arm 10 is the camera side arm 8.
It is inserted in and is fixed by the clamp 11. A tip fitting 12 for pivotally supporting the camera mount 3 is fixed to the tip of the telescopic arm 10.

As shown in detail in FIG. 2, the arm intermediate member 7 is pivotally supported on the support 1 by bearings 13 and 14, and a bearing 16 supports a shaft 15 orthogonal to the pivot shaft. A small bevel gear 17 is fixed to the shaft 15, and is engaged with a large bevel gear 18 fixed to the column 1. One end of the shaft 15 is connected by a pin 20 to a tubular rotary shaft 19 that penetrates the inside of the camera-side arm 8.

As shown in FIG. 3, the fastening member 11 is screwed with the threaded portion at the tip of the camera-side arm 8 so that the outer surface of the telescopic arm 10 inserted into the arm 8 has a tapered sliding piece 21. Tighten and fix with. At this time, a key 22 provided on the inner surface of the arm 8 and a key groove 23 on the outer surface of the arm 10 are fitted to each other to prevent the telescopic arm 10 from rotating. Incidentally, 24 is a stopper ring for preventing the arm 10 from coming off. The tubular rotary shaft 19 penetrating the inside of the camera-side arm 8 has the rear end of the rotary shaft 25 penetrating the inside of the telescopic arm 10 inserted therein, and is attached to the tip of the tubular transmission shaft 19. The key 26 and the key groove 27 provided on the shaft 25 are fitted to each other to form a rotary shaft that is expandable and contractible and transmits rotation.

As shown in FIG. 4, a tip fitting 12 is fixed to the tip of the telescopic arm 10, and a shaft 29 fixed to the camera mount 3 and the large bevel gear 28 is supported by a bearing 30. The base of the tip fitting 12 supports a rotating shaft 25 penetrating the inside of the telescopic arm 10 by a bearing 31, and a small bevel gear 32 is attached to the tip of the rotating shaft 25 to attach the large bevel gear 28. Is engaged with. The axis of the shaft 29 and the axis of the rotary shaft 25 are orthogonal to each other, and as a result, the axis 29 of the camera mount 3 is parallel to the pivot axis of the arm intermediate member 7, that is, the elevation axis of the arm 2.

The large bevel gears 18 and 28 and the small bevel gears 17 and 32 which mesh with the large bevel gears 18 have the same number of teeth. Since the large bevel gear 18 is fixed to the column 1 and does not rotate, the arm 2
The large bevel gear 28 does not rotate relative to 18 regardless of the depression / elevation angle. That is, the posture of the camera mount 3 is always constant. Therefore, if the optical axis of the camera mounted on the camera mount 3 is initially horizontal, the optical axis of the camera is always kept horizontal regardless of how the height of the camera changes depending on the elevation of the arm 2. Further, even if the tightening metal fitting 11 is operated to set the telescopic arm 10 to any position, the above-mentioned function does not change. However, it is necessary to adjust the weight of the balance weight 4 or the mounting position depending on the length of the arm.

An embodiment different from the above is shown in FIG. The arm unit 51 includes a cylindrical arm 52, a rotary shaft 53 that penetrates the inside of the arm 52, and a bearing 54 that supports the shaft 53. The plurality of arm units 51 are connected to each other by a shaft joint 55 for rotating shafts and a pipe joint 52 for connecting cylindrical arms to form a long arm. The arm unit on the column side is connected to the arm intermediate member 7 and the shaft 15 similar to those shown in FIG. 2, and the arm unit on the camera mount side is connected to the tip fitting 12 and the shaft of the small bevel gear 32 similar to those in FIG. It With this structure, when carrying and storing, each arm unit is disassembled for carrying and storing, and at the time of use, a camera crane having a long arm can be easily assembled simply by using a shaft joint and a pipe joint.

[0015]

Since the attitude of the camera mounting portion is controlled by the rotary shaft housed in the arm and the bevel gears at both ends of the arm, there is no risk of the arm being pinched up and down and the camera crane. It is possible to reduce the size and weight.
Also, the arm and rotating shaft can be expanded and contracted,
A structure that can be easily connected is facilitated, which makes it possible to shorten or divide the arm during transportation and storage.

[Brief description of drawings]

FIG. 1 is a front view of a camera crane according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a sectional view taken along the line CC of FIG.

FIG. 5 is a front view of a camera crane according to another embodiment of the present invention.

FIG. 6 is a front view of a conventional camera crane.

FIG. 7 is a front view of another conventional camera crane.

[Explanation of symbols]

 1 Support 2 Arm 3 Camera Mount 4 Balance Weight 7 Arm Intermediate Member 8 Camera Side Arm 10 Telescopic Arm 11 Tightening Metal Fitting 12 Tip Metal Fitting 17.32 Small Bevel Gear 18.28 Large Bevel Gear 19 Tubular Rotating Shaft 25 Rotating Shaft

Claims (6)

[Claims] 1. A camera crane in which an arm pivotally supported by a column is raised and a camera mounting portion is pivotally attached to a tip of the arm, and a rotation shaft is installed along the arm, and a rotation transmission mechanism provided at both ends thereof. And a rotation transmission mechanism provided on the support column and the camera mounting portion, respectively, to control the attitude of the camera mounting portion. 2. The camera crane according to claim 1, wherein the rotation transmission mechanism is a bevel gear. 3. The bevel gear provided on the elevation shaft of the arm is fixed to the support column so that the posture of the camera mounting portion is always constant irrespective of the elevation angle of the arm. Camera crane. 4. The arm is formed of a hollow cylindrical structure,
The camera crane according to claim 1, wherein the rotary shaft is housed inside thereof. 5. The arm is formed by expanding and contracting two large and small hollow cylindrical structures, and the rotating shaft is a combination structure of two shafts that expand and contract and transmit rotation. The camera crane according to claim 4. 6. A single arm is a hollow cylindrical structure in which a rotating shaft is supported by a bearing, and the rotating shaft is a shaft joint and the cylindrical structure is a pipe joint. The camera crane according to claim 4, wherein the camera cranes are connected to each other to form an elongated arm.