Untitled record

Tripod The invention relates to a tripod whose device carrier can be brought into different positions.

For this purpose, tripods are known which have a ball joint with friction inhibition.

In a known ball joint tripod head two ball heads are mounted in a common center, which are each under the pressure of a spring, the closer to the tripod spring is stronger than the other and the ball heads are detectable by a trained as a double eccentric gag. This different vote of the springs for the ball heads here has the purpose to prevent the tilting of the device carrier when releasing the locking devices.

In another known tripod head of the stand carrier has a spherical shell-shaped bottom, which is received by the concave surface of a spherical shell-shaped head piece. At the convex bottom of the head piece, a ball counter shell can be clamped by means of a screw rod which is connected to the device carrier. The system pressure of the screw rod is transmitted to the ball counter shell by an axial ball bearing and an elastic buffer.

Another known tripod head, in particular for a film camera, has a ball joint whose joint shell is connected to the device carrier. The ball is hollow, contains a spring and has an opening at the top. A pull cable is attached at one end to the device carrier, passed through the opening and connected at the other end with the spring, so that it is tense more when tilting the tripod head with increasing inclination. As a result, the disadvantage of conventional ball joints, a greater force required with increasing tendency to erect the camera from the inclined position, overcome.

There are also tripods with flexible links, also known in connection with a hinge.

A known flexible support is constructed of individual mutually movable members forming a hollow strand, wherein the mutual mobility can be changed or prevented by acting in the interior of the strand liquid or gas pressure. Such an arrangement is very expensive and therefore particularly suitable for portable tripods.

In a known tripod, the upper part of the legs is designed so flexible that they remain in the respective bent state. In this case, the device carrier is attached to the upper ends of the legs connecting part by means of a rotary joint which has two joint half-shells, which can be pressed by a screw on opposite sides of the hinge pin.

Deviating from these known arrangements, the present invention is based on a stand which has a gooseneck device carrier which can be brought into various positions by the presence of an elastic member. In such a tripod, the position of the object held by the stand (eg. Light source, camera, microphone, speakers) versatile and adapted to the respective conditions', because the gooseneck is flexible on all sides and maintains a given bending due to its own friction inhibition. In practical use, however, as a result of the high, often very rough and frequent bending stress of the gooseneck, experience has shown that sooner or later it becomes "lame", ie by "permanent" deformation, he loses the advantageous property of securely maintaining a newly given bend.

The invention aims to avoid this disadvantage and is characterized by the use in tripods, in which a part 'with a fixed base, z. As a base plate, a column or a tripod, by at least one joint with friction inhibition or locking device with coordination of the frictional resistance or latching force to different levels of stress, z. B. by differently sized spring preload, is connected, however, in such a dimension of the overcome to overcome the friction or to leave the detent position resistance that the torque required to move the joint is smaller than the maximum permissible for the elastic gooseneck member bending moment.

When adjusting the position of a carried by this tripod object of friction or locking resistance is overcome and the joint adjusted before the gooseneck suffered an unacceptably high bending moment. This avoids overstressing the gooseneck so that it does not lose its property of maintaining a bend given to it each time the tripod is used.

Although the joint has the effect already hitherto on the above-mentioned tripods with different coordination of the friction half. However, this effect is less crucial, because the gooseneck already allows a versatile adjustability. Much more important is the tripod according to the invention that the joint of the specified design protects the gooseneck from damage due to overloading, which task does not occur in the known tripod without gooseneck substantially.

In order to protect the gooseneck substantially only against torsional overstress, the axis of the joint can extend at least approximately in the longitudinal direction with the gooseneck stretched.

In order to protect the gooseneck against bending overstress, the axis of the joint can extend at least approximately perpendicular to the longitudinal direction with the gooseneck stretched.

Conveniently, however, the joint is a ball joint.

The tripod can also have a plurality of joints of the same or different type, which is protected against overuse by cooperation of the coordinated in the sense of the invention friction inhibiting the joints of the gooseneck.

In a tripod having telescopically nested parts, at least a pair of such parts may form the links of one of the hinges by being rotatable into each other with the necessary frictional resistance. Since the friction inhibition also acts when pulling apart and telescoping of the tubes, the gooseneck is also protected against excessive tensile and compressive stresses.

In the drawing, the subject invention is shown, for example. It shows: F i g. 1 a microphone stand with three joints, one of which is formed by a telescopically extendable pair of tubes, with the microphone, F i g. 2 a detail on F i g. 1, partly in section, F i g. 3 a foot of a microphone stand with ball joint, partly in section.

The in F i g. 1 illustrated stand has a foot 1, a column 2, a pair of telescopically extendable tubular parts 3 and 4 and a gooseneck 5. The microphone is denoted by 6. The column 2 is by means of a in F i g. 2 closer connection shown connected to the foot 1 and continuously rotatable in the direction of the double arrow 7. The tube 3 is connected by a hinge 8 with the column 2 and in the direction of the double arrow 9 continuously swiveled. The tube 4 is longitudinally displaceable in the tube 3 in the direction of the double arrow 10 and continuously rotatable in the direction of the double arrow 11. A portion 12a of the microphone cable 12 is helically wound in the tube 3 in order to avoid inadmissible tensile and torsional stresses of the microphone cable when the tube 4 is moved in the direction of the double arrows 9,10,11. Also in the column 2, a part of the microphone cable can be helically wound (not shown) in order to avoid overstressing the cable when moving the stator in the direction of the double arrows 7 and 9. Like F i g. 2, the lower end of the column 2 has a conical surface 13 and a projection 14 projecting into the cavity of the foot 1. A nut 15 and a locking nut 16 locking it are screwed onto the projection 14. Between the nuts 15, 16 and the foot 1 disc springs 17 are arranged on the projection 14, which ensure a certain friction between the conical surface 13 and the counter surface of the foot 1 associated therewith. Also, the joint 8 (not shown in detail) (in Fig. 1) has a z. B. adjustable by means of spring washer and screw, predetermined friction. Between the tubes 3 and 4, a predetermined friction by means of a plastic ring 18 is achieved.

The friction between the conical surface 13 and the stand base 1 is set so that it is at least overcome and the column 2 rotates in the direction of the double arrow 7, when the maximum permissible bending moment at the gooseneck 5 occurs when pivoting the microphone 6 perpendicular to the plane of the drawing, and in the most unfavorable position of the tubes 3 and 4 relative to each other and relative to the column 2. Accordingly, the friction of the joint 8 is adjusted. The mutual friction of the tubes 3 and 4 is chosen so that it is at least overcome when by movement of the microphone in the direction of the double arrows 10 and 11, the maximum permissible torsional and tensile or compressive stress of the gooseneck 5 occurs.

The in F i g. 3 has a ball joint, the ball 23 is rotatably mounted with friction between a conical (or spherical zone) surface la of the stand base 1 'and a coaxially to the surface 1 a in the stand base 1' slidably mounted ring 19. The ring 19 abuts the ball 23 with a conical (or spherical-zone-shaped) surface of its opening. The ring 19 is pressed by a spring 20 against the ball 23. The tension of the spring 20 is adjustable by means of a union nut 21. On the ball 23, a sleeve 22 is attached to which one end of the (not shown) gooseneck is attached, which carries the microphone at the other end. In place of the gooseneck z. As a column to which a gooseneck is attached to the microphone, or one of two telescopically slidable tubes, wherein the other tube carries the gooseneck with the microphone. The friction between the ball 23, the surface 1 a and the ring 19 is dimensioned by appropriate adjustment of the union nut 21 so that it is at least overcome if the maximum allowable stress of the gooseneck would be exceeded by movement of the microphone in any direction.

Each of the joints with an axis of rotation and the ball joint can be provided with locking devices which are dimensioned so that the force required to leave the detent position does not lead to an overuse of the gooseneck.

The gooseneck may be embedded in plastic for attachment to the end of the tube 4 (Fig. 1) or the sleeve 22 (Fig. 3). If the microphone is plugged in at the end of the tripod (eg by means of a sleeve and a counterpart fitting into it), then this plug connection, according to an expedient development of the invention, also has such a friction that it permits rotation (or is released). before an inadmissible torsional stress (or tension) of the gooseneck occurs. The microphone can then be removed without overuse of the gooseneck and used as a handheld microphone. If the microphone cable is guided inside the tripod, then it must be spirally wound in it so that it can be pulled out to achieve sufficient freedom of movement, and so elastic that it retracts into the tripod when the microphone is attached to the tripod again ,