JPH0811086Y2 - Camera swing brake - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera platform for supporting a large camera such as a video camera or a movie camera so as to be rotatable horizontally or vertically, and a swivel provided on a tripod platform. The present invention relates to a braking device.

[0002]

2. Description of the Related Art When an operation for rotating a camera horizontally or vertically is performed, it is necessary to increase or decrease the resistance applied to the camera with respect to the rotation speed depending on the weight of the camera and the preference of the cameraman.

In a conventional camera platform, a swing braking device provided on a tripod platform portion, a base is provided within the platform platform or tripod platform portion, and a support that rotates around the center of the platform as a fulcrum. Put a rubber or synthetic resin resistance piece on one of the bodies and put it in the housing, enclose a high-viscosity lubricant, press the resistance piece on either the base or the support to generate a high friction force, The force of pressing the resistance piece was adjusted to control the increase or decrease in resistance.

As described above, the conventional swing braking device can perform stable rotation operation by the high-viscosity lubricant between the resistance pieces pressed against the base or the support, but the resistance of the resistance pieces is reduced. Immediately after the adjustment, an excessively small amount of lubricant causes the support to rotate even if an extremely small external force is applied, which is not preferable when photographing a still object with a camera. Also, when the time has elapsed after adjusting the resistance, the force that presses the resistance piece pushes out the lubricant existing between the base or support and the resistance piece, and escapes to another place, causing the resistance of the lubricant to Instead, there was a drawback that the stability and smoothness at the time of rotation were poor because only the resistance of the material of the resistance piece and the contact surface were present.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The problems of the present invention are to eliminate the above-mentioned drawbacks of the prior art, and to provide a camera platform for smooth rotation operation, and a platform mounted on a tripod of the camera. Another object is to provide a swing braking device.

A turning brake device for a camera according to the present invention is a turning brake device which rotates about a center of a base provided in a platform or a tripod platform part as a fulcrum, and has a Y-shaped base. A resistance piece formed of a non-adsorptive elastic material is attached to any of the inner surface of the annular support to which the guide notch disk is fitted, the resistance piece being formed by joining the cut-out guide pieces. Innumerable small recesses are formed on the surface of.

As a result, the Y-shaped notch of the guide disc connected to the base forms a thin portion, and the elasticity of the thin portion expands the resistance piece and the bonding surface. In addition, since a large number of small recesses are formed on the surface of the resistance piece, the contact area of the resistance piece becomes small, and when the resistance piece is pressed against the contact surface, only unnecessary lubricant escapes into the small recess. . Therefore, due to the resistance of the contact surface between the lubricant and the resistance piece, the base cannot be moved unless a large external force is applied as compared with the conventional one.

Even after a lapse of time after the resistance adjustment, the lubricant that has entered the small recesses on the surface of the resistance piece is drawn out during rotation and evenly spreads over the resistance piece and the contact surface. Smooth rotation operation is performed by the resistance of the contact surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 11 in the drawing denotes a circular base which is a part of a camera rotation braking device provided in a platform for fixing a video camera, a movie camera or the like or a tripod platform. Thrust bearing 1 is attached to the small diameter circumferential portion 12 on the lower surface.
The circular rings 14 and 15 with the intervening 3 are fitted, the fixed ring 16 is fitted to the outer side thereof, and the guide disc 17 which is joined by inserting the pin 17 into the eccentric hole 19 of the base 11 is polymerized and fixed to the fixed ring 16. The ring-shaped support 20 is fitted to the inner periphery of the ring-shaped support 20.
A screw rod 25 erected at the center of the base is fitted into a center hole 27 of the base 11 via a bearing 26 and fixed by a nut 28. Then, two resistance pieces 21 made of rubber, soft synthetic resin or the like having sufficient elasticity and non-absorption of water and oil are attached to the circumferential surface of the guide disk 18 at equal intervals. The resistance piece 21 has a large number of small recesses 22 formed irregularly on its surface. 29 in the figure
Is fixed to the actuator 31 inserted in the hole 30 of the base 11 by adjusting the gap between the support 20 and the guide disk 18. The annular support 20 is a part of a platform that is fixedly attached to the top of the tripod.

[0010]

[Effects] According to the present invention, the contact surface area of the resistance piece becomes small due to the innumerable small recesses formed in the resistance piece, and when the resistance piece is pressed against the contact surface, only the unnecessary lubricant easily escapes, and Due to the resistance of the contact surface of the resistance piece, the base will not move unless a large external force is applied. Therefore, it does not hinder the shooting of a stationary object. Further, the lubricant that has entered the small concave portion of the resistance piece is drawn out at the time of rotation and evenly spreads over the resistance piece and the contact surface, and a smooth rotation operation is performed. When the resistance once adjusted was removed by touch, the small recesses of the resistance piece that had been pressed were in a vacuum state by the amount of the lubricant that had been extruded, so the lubricant near the resistance piece could be easily drawn in and immediately A smooth turning operation can be performed due to the influence of the lubricant.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a swing braking device.

FIG. 2 is a vertical cross-sectional view of a part of the swing braking device.

FIG. 3 is an enlarged cross-sectional view of a part of the resistance piece.

FIG. 4 is a plan view of a guide missing disk.

5 is a vertical cross-sectional view taken along line XX ′ of FIG.

[Explanation of symbols]

 11 Base 17 Pin 18 Guide Missing Disk 20 Annular Support 21 Resistor Piece 22 Small Recess

Claims (1)

[Scope of utility model registration request] 1. A swing braking device that rotates about a center of a base provided in a platform or a platform of a tripod as a fulcrum.
Join the guide disc with the Y-shaped notch on the base,
Also , a resistance pile formed of a non-adsorptive elastic material is adhered to either the outer surface of the guide missing disk or the inner surface of the annular support into which the guide missing disk fits, and is attached to the surface of the resistance piece. A turning braking device for a camera that has numerous small recesses.