DE3430738A1 - Stand for a camera or for other optical apparatus - Google Patents

Abstract

A stand (10) for a camera or for another optical apparatus is described, with a stand head (12) from which stand legs (14) extend downwards with telescopic tubes (16, 18) which can be pushed into one another. The telescopic tubes (16, 18) can be locked by means of a fixing device, which has an operating rod (20), on the front end region of which two clamping cones (22, 24) which taper in the same direction are arranged. Each clamping cone (22, 24) is enclosed by a pressure element (26, 28), which pressure elements (26, 28) press against the inside wall of the outer telescopic tube (18) when the fixing device is in its normal position, so that there is frictional engagement between the two telescopic tubes (16, 18), which engagement can be manually overcome. <IMAGE>

Description

Dipl.-Phys. CLAUS PÖHLAU. _: . · ".. ·.". I Dlpl.-lng. FRANZ TOHREMTZ; -; ;. · · ■ ·. "..:.

Dlpl.-Phys.WOLFGANG 3Γ. & Ε M SO / O pj -7 7 2 "'- -' KESSLERPLATZ 1 OtOU / OO

8500 NUREMBERG 20 ^ w _

CULLMANN Handelsgesellschaft 24.367 / 8 70-bn

for consumer goods mbH

Waldstrasse 12

8506 Langenzenn-Laubendorf

Tripod for a camera

or for another optical device.

The invention relates to a tripod for a photo, film or video camera, or for another optical device, with a tripod head from which the tripod legs protrude downwards and have telescopic tubes that can be slid into one another, which can be locked against one another by means of a locking device, the locking device one clamping cone that can be actuated from outside the telescopic tubes and one that is in operative connection with the clamping cone Having pressure element.

In the known tripods, the tripod legs are made of telescopic tubes that can be slid into one another in such a way that that the telescopic tubes which can be slid into one another simply by means of a locking device against each other in each can be locked in any position. The telescopic tubes, which can be slid into one another, move there when the lock is unlocked Locking device, however, as a result of gravity freely downwards, so that in a certain The camera to be installed at a height while the telescopic tubes, which can be slid into one another, slide smoothly must be held precisely at this certain height until the locking device is used to slide the one into the other Telescopic tubes are locked. This can be tedious under certain circumstances, or it is with one of these Tripod often difficult to set a desired position of a camera precisely.

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There are also stands of the type mentioned are known in which the locking device from outside the telescopic tubes have actuatable clamping cone and a pressure element. Such a locking device, which is known as a collet with internal clamping however, the lack that the area in which with maximally extended telescopic tubes between the telescopic tubes is given a guide in the axial direction, is very short, so that especially when pulled apart to the maximum Tfeleskoprohren the two telescopic tubes also in the locked, i.e. in the air-locked state against each other can be inclined or kinked. As a result of this mutual inclinability of the two telescopic Pipes, the stability of such a known tripod of the type mentioned is still insufficient.

The present invention is therefore based on the object of improving a tripod of the type mentioned at the outset in such a way that that the telescopic tubes in the locked state of the locking device not unintentionally by themselves can move due to gravity, and that the stability of each tripod leg also in the maximum expanded condition is considerably improved.

This object is achieved according to the invention in that the locking device an iixially displaceable actuating rod has, arranged at the front end region of two clamping cones tapering in the same direction are, each clamping cone is surrounded by a pressure element, which by means of a holding part on the inner end area of the inner telescopic tube is securely mounted against axial displacement and on the inner wall of the outer one Telescopic tube rests, and that between the botut i

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rod and a holding part for a pressure element, an elastic spring element is arranged such that the two Clamping cones counteract the pressure elements in the normal operating state of the locking device with such a force press the inner wall of the outer telescopic tube so that between the two telescopic tubes one has to be overcome by hand Frictional engagement is given.

Due to the inventive arrangement of the actuating rod the particular advantage is achieved that the actuating part connected to the actuating rod in the vicinity of the Tripod head can be arranged so that the locking device of each tripod leg is in every position, i.e., regardless of the length of a tripod leg, it is always close to the tripod head and can be operated there, while it is with known tripods in which the actuating part for the locking device is in the transition area located between the two telescopic tubes, it may be necessary to bend down to the operating part in particular Can be handled with the tripod set low. Due to the presence of two clamping cones and two with the clamping cones cooperating pressure elements, which by means of two holding parts in the inner end area of the inner telescopic tube are mounted securely against axial displacements, the tripod according to the invention has the particular advantage achieved that the two telescopic tubes also in the fully extended and locked state along a are supported by the distance between the two pressure elements given guide, so that kinks between the two telescopic tubes in any position, i.e. with any length of a tripod leg, can be safely avoided. on In this way, the stand according to the invention has excellent stability at all times.

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Because the two clamping cones interact with them Printing elements in normal operating condition, d. H. in the state in which the locking device neither in the locked position, in which the telescopic tubes are secured against displacement, nor in the locked position, in which the telescopic tubes run smoothly against each other due to the force of gravity are displaceable, is located, press with a force against the inner wall of the outer telescopic tube, so that there is a frictional connection between the two telescopic tubes that has to be overcome by hand, becomes the special one The advantage achieved that the telescopic tubes to adjust the total length of each tripod leg very precisely in Relation to each other can be adjusted.

The two clamping cones attached to the operating rod can have such a distance from one another that the two pressure elements surrounding the clamping cones between them the first Ilalteelement attached to the front of the inner end area of the inner telescopic tube include, and the elastic Fedcrclement can preferably be a compression spring, the inside of the cage-shaped formed first holding part mechanically biased between the first holding part and the actuating rod is arranged. This arrangement of the clamping cones and the pressure elements, which between them the first holding element include tightly fitting, results in a very space-saving structure of the fastening device, without the functionality of the fastening device and thus the functionality of the tripod according to the invention is affected. Through this arrangement of the clamping cones, the pressure elements and the Haitoteile it is possible as Spring element to use a compression spring, the advantage known per se being achieved with a compression spring, that a compression spring remains functional even if

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it is broken, while a mainspring would be ineffective in such a condition. By such an elastic The spring element also has the particular advantage that the tripod according to the invention has excellent displacement behavior the two telescopic tubes of a tripod leg. '· ·

The first and the second holding part can be resilient locking members and the inner end region of the inner telescopic tube can have recesses in which the locking members of the two holding elements when assembling the tripod leg snap into place. Holding parts designed in this way are very easy to manufacture and very easy to use in accordance with the invention Stand mountable. Another advantage of holding parts designed in this way is that they are at the inner end region of the inner telescopic tube can be fastened very securely, so that even after a very long period of use of such a tripod according to the invention, damage of the individual parts of the fastening devices of the Tripod legs can be safely excluded.

It has proven to be advantageous that the actuating rod has an external thread along a partial area, that for setting a bias of the resilient element located in the inner telescopic tube and threaded bushing secured against twisting can be screwed. Such a design of the inventive Tripods it is very easy to adjust the mechanical preload of the resilient element in this way set that the clamping cones more or less moved axially against the axially fixed pressure elements so that the pressure elements in the normal operating state more or less strongly against the inner wall of the press the outer telescopic tube. This compressive force determines the frictional engagement, i.e. the frictional force between the indirectly

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üruekolcmenten connected to the inner telescopic tube and the outer telescopic tube, so that the frictional connection between the outer and the inner telescopic tube is achieved by adjusting the preload of the resilient hlemontes can be set very precisely. This: friction:; - conclusion should be of such a size that it is relatively easy to move the two telescopic tubes to move against each other by hand, without the two telescopic tubes as a result of gravity can move.

The second pressure element can be a tubular part on v / iron, that with its Ausscnabmcssungen on the inside dimensions of the inner telescopic tube, is and dais by means of [

of the second holding part against axial displacements ge j

is secured, with the connection to the tubular part «

with the second clamping cone -cooperating, resilient Guide elements are provided which extend through recesses in the inner "telescopic tube" and face the inner wall of the outer telescopic tube. With this design of the second pressure element a tubular part that with its external dimensions to the inner dimensions of the inner Tolcskop-

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tube is adapted, there is a problem-free assembly of this second pressure element, which by means of the second Holding part is secured against larger axial displacements within the inner telescopic tube. To the tubular parts of the two-tone pressure element are in one piece the resilient guide elements cooperating with the second clamping cone are integrally formed, the recesses in the inner telescopic tube, through which the pressure elements extend, the axially displaceability keep the second pressure element within permissible limits.

Further details, features and advantages emerge from the following description of one in the drawing illustrated embodiment oines according to the invention Tripods. LIs show:

Fig. 1 is a side view of a tripod, and

Fig. 2 shows an enlarged view of the details "II" from Fig. 1 in longitudinal section.

Figure 1 shows a tripod 10 for a photo, film or Video camera, or any other optical device such as a telescope can, with a tripod head 12, from the tripod legs 14 stand away downwards. The tripod legs 14 have telescopic tubes 16 and 18 which can be displaced into one another and which are opposite one another are lockable. With the tripod 10 according to the invention In contrast to known tripods, the inner telescopic tubes 16 are arranged on the tripod head 12, while the outer Telescopic tubes 18 on the underside of the inner telescopic tubes 16 and slidable over the inner telescopic tubes 16 Are arranged lockable.

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FIG. 2 shows the detail "II" according to FIG. 1 on a larger scale in section. This figure shows the front one End of the inner telescopic tube 16 and a portion of the outer telescopic tube 18, which means a locking device can be locked against each other. According to the invention, the locking device an axially displaceable actuating rod 20 extending through the inner telescopic tube 16 on, at the inside of the stand leg 14 located front end region two in the same direction tapering clamping cones 22 and 24 are arranged. Each of these clamping cones 22 and 24 is from a pressure element 26 and 28, respectively, which by means of a holding part 30 and 32 at the inner end region of the inner telescopic tube 16 mounted securely against axial displacements, the inner wall 3 4 of the outer telescopic tube 18 faces, and rests against the inner wall 34 or presses against the inner wall 34. Between the operating rod 20 and the first holding part 30 for the pressure element 26 is an elastic spring element 36 in the form of a compression spring angeoi'dnet, by means of the two clamping cones 22 and 24, the pressure elements 26 and 28 corresponding to them in the normal operating state the locking device with such a force against the inner wall 34 of the outer telescopic tube 18 press that between the two telescopic tubes 16 and 18 a frictional connection to be overcome by hand is given. This frictional connection between the two Telescopic tubes 16 and 18 prevented in advantageous Way an unwanted displacement of the two telescopic tubes 16 and 18 as a result of the force of gravity acting on them. The two clamping cones 22 and 24 fastened to the fastening rod 20 are at such a distance from one another on that the two clamping cones 22 and 24 each surrounding pressure elements 26 and 28 between them at the front of the inner end area of the inner telescopic tube 16

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attached first holding part 30 include. As already mentioned, the resilient element 36 is preferred a compression spring inside the cage-shaped first holding part 30 between the first holding part 30 and the actuating rod 20 are mechanically preloaded in the normal operating state of the locking device is arranged. This mechanical pre-tensioning of the resilient element 36 causes the two tensioning cones 22 and 24 pressed in the direction of their taper, whereby the cones 22 and 24 surrounding pressure elements 26 and 28 due to the wedge effect are pressed radially outward so that between the pressure elements 26 and 28 and the inner wall 34 of the outer telescopic tube 18 a frictional connection is given.

The first holding part 30 and the second holding part 32 have resilient latching members 38 and 4Ü, respectively. Same thing the inner end region of the inner telescopic tube 16 has recesses 42 and 44, in which the locking members 38 and 40 of the two llaltoolomente 30 and 32 engage.

The actuating rod 20 has an external thread along a partial area not shown in this figure on that for setting a certain bias of the resilient element 36 in an inner telescopic tube 16 located and secured against twisting threaded bushing, which is also not shown in this figure is, is screwable. By rotating the actuating rod 20 in the threaded bushing, not shown the two clamping cones 22 and 24 are shifted in the axial direction so that the clamping cones 22 and 24 surrounding pressure elements 26 or 28 more or less against the inner wall 34 of the outer telescopic tube 18 be pressed, whereby the friction connection between the inner telescopic tube 16 and the outer telescopic

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tube 18 is strengthened or weakened.

The second pressure element 28 has a tubular part 50, which with its outer dimensions to the Internal dimensions of the inner telescopic tube 16 is adapted and that by means of the second holding part 32 against axial displacements is secured. Following the tubular part 50 are with the second clamping cone 24 cooperating resilient guide elements 52 are provided, which are located in the recesses 44 in the interior Telescopic tube 16 extend through and the inner wall 34 of the outer telescopic tube 18 are facing.

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Claims (4)

Expectations: Tripod for a photo, film or video camera, or for another optical device, with a tripod head, protrude from the tripod legs downwards, which have telescopic tubes which can be slid into one another and which by means of a locking device can be locked against each other, the locking device one from outside the telescopic tubes actuatable clamping cone and one that is in operative connection with the clamping cone Has printing element ,, characterized in that the locking device is an axially displaceable Has actuating rod (20), at the front end region of which two tapering in the same direction Clamping cones (22,24) are arranged, each clamping cone (22, 24) being supported by a pressure element (26, 28) is surrounded, which by means of a holding part (30, 32) on the inner end region of the inner telescopic tube (16) is securely mounted against axial displacement and on the inner wall (34) of the outer telescopic tube (18) rests, and that between the actuating rod (20) and a holding part (30, 32) for a pressure element (26, 28) an elastic spring element (36) is arranged in such a way that the two clamping cones (22, 24) the pressure elements (26, 28) in the normal operating state EPO COPY the locking device with a force against the inner wall (34) dos outer Tclcskoprohres (18) press that between the two telescopic tubes (16, 18) are given a frictional connection that can be overcome by hand. 2. Stand according to claim 1, characterized in that the two fastened to the fastening rod (20) Clamping cones (22, 24) are spaced apart from one another by such a distance that both the clamping cones (22, 24) surrounding pressure elements (26, 28) between them on the front of the inner end region of the inner Teleskoprohrcs (16) attached first holding part (30) include, and that the elastic Fcdcrelcmcnt (36) is a compression spring that is inside of the cage-shaped first holding part (30) between the first holding part (30) and the actuating rod (20) is arranged mechanically preloaded. 3. Stand according to claim 1 or 2, characterized in that the first and the second holding part (30,32) are resilient Latching members (38, 40) and the inner end area of the inner telescopic tube (16) have recesses (42, 44) have, in which the locking members (38, 40) of the two holding parts (30, 32) when assembling the Engage the tripod leg (14). 4. Stand according to one of the preceding claims, characterized in that that the actuating rod (20) has an outer windc along a partial area, which is used for adjustment a bias of the resilient element (3 6) in a telescopic tube (16) located in the inner and Threaded bushing secured against rotation can be screwed. EPO COPY Stand according to one of Claims 1 to 4, characterized in that that the second pressure element (28) has a tubular part (50), which with its external dimensions is adapted to the inner dimensions of the inner telescopic tube (16) and that by means of the second holding part (32) is secured against axial displacement, in connection with the tubular part (50) with the second clamping cone (24) cooperating, resilient guide elements (52) are provided which extend through the recesses (44) in the inner telescopic tube (16) and the inner wall (34) of the outer telescopic tube (18) are facing EPOCOPY Jl