JP2582426Y2 - Central fixing device for tripod - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripod center fixing device (Mittelspinne). More specifically, the present invention relates to a tripod center fixing device used for a large camera such as a movie camera or a television camera.

[0002]

2. Description of the Related Art Tripods used, for example, for holding cinema cameras or television cameras use a so-called central fixing device for fixing the support legs of the tripod in an extended position, especially on uneven terrain. This central fixation device
It consists of three fixed arms (Spinnenarm), the outer ends of which are each fixed inside each leg of the tripod, the inner ends of which converge towards one point on the longitudinal axis of the tripod. The outer end of the fixed arm is mounted on the support leg and the inner fixed arm is mounted on a common holding block so that the tripod can be folded together with the central fixing device, generally pivotable about a horizontal axis. ing.

[0003] In order to be able to adjust the opening of the support legs with such a central fixing device, mainly two types of configurations are known. In a first configuration, the fixed arm is in one plane with the tripod open, so that its length can be adjusted and fixed in order to adjust its opening, for example as a telescopic arm Is formed. In order to improve the rigidity of this central anchoring structure, the inner end of the anchoring arm is often additionally fixed in place, for example by a fixing plate.

In a second configuration, the inner end of the fixed arm is connected to a stop ring, which can move along a central post of the tripod, on which the
For example, it can be fixed at different heights by set screws. Thus, in this configuration, the opening of the tripod is determined primarily by the various angles of the apex or base of the "pyramid" formed by the three fixed arms. That is, the opening of the tripod is determined by various angles between the fixed arm and the support leg, or between the fixed arm and the center post. Furthermore, the fixed arm is the first
Its length can be adjusted, as in the structure of FIG.

Therefore, when changing the opening of the support legs,
In the first configuration, three support legs must be newly adjusted, which is troublesome. In the second configuration, on the other hand, it is only necessary to adjust the stop ring to a new position, in which case an expensive tripod with a central post is required.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a center fixing device having a novel structure which can easily and quickly fix an opening of a support leg even with a simple tripod.

[0007]

SUMMARY OF THE INVENTION This object is achieved according to the invention by means of three fixings , the outer ends of which are each articulated to the respective supporting leg of a tripod, the inner ends of which are pivotally connected to a common receptacle. A central fixing device for a tripod that includes an arm and fixes a support leg of a tripod in an extended position even on uneven terrain, wherein a receiving portion (5) for a fixing arm (6) is provided with a fixing arm.
A plurality of fixing parts (16) for the arm (6)
Arms (6) cooperate with different fixing parts (16)
And adjusting the open positions of the three fixed arms (6), and
Open determined by the position is solved by a central fixing device for tripods, characterized in that it is held in the opening angle equal to each other.

In accordance with the present invention, a holding block, or mounting, for the fixed arm is provided on the holding block, the inner ends of the fixed arm converging toward a point and being rotatably bearing, the mounting being provided. A tool supports the fixed arm in various angular positions. Therefore, this configuration is similar in principle to the second structure described above, in which the opening of the support legs is adjusted by various angles of the "pyramid" formed by the fixed arm, but in the present invention the central pillar There is no need for a tripod with.

[0009]

In order to form the holding block and the fixing portion of the "pyramid tip", many configurations are possible. For example, a retaining block with different lengths of engagement and fixable locking portions, a rotation changer with a plurality of locking portions of different lengths, or a continuous pyramid angle on the holding block In order to achieve this, a rotary changer with a continuous control curve or the like is possible.

[0010] A sufficiently practical and robust construction is such that it can rotate about the longitudinal axis of the pyramid formed by the fixed arm and has a plurality of cuts under the ring-shaped side wall surrounding the holding block, Are arranged at a plurality of, for example, four different height positions in three groups for each of three fixed arms,
A rotating grip such that the fixed arms fit into their cuts. Preferably, the rotating grip is lid-shaped, surrounds the holding block, the cut is located on the edge facing downwards, and above the rotating grip is a hand for rotating the rotating grip. It has a grip. The pivot axis of the fixed arm is in this configuration inside the rotating grip in the holding block.

[0011] The fixing arm of the central fixing device can be a nested arm which can be fixed with a variable length. The present invention will be described in detail in embodiments with reference to the accompanying drawings.

[0012]

1 shows a tripod 1 with three folding and adjustable length support legs 2 and a swivel head 3 for a cinema camera or a television camera. The supporting leg 2 which is opened so that the tripod is stabilized is fixed by the central fixing device 4.
Held in its open position. The central fixing device 4 includes a central receiving portion 5 and three fixing arms 6.

2 and 3, the fixed arms 6 converge on a star-shaped joint 7 with a truncated inner end, and each fixed arm 6
Each of the three arms of the three-pointed star joint is supported so as to be able to pivot around the axis 8. The star-shaped joint 7 is connected to a lid-shaped rotating grip 9 that can rotate about the central axis of the joint. The side wall of the rotary grip 9 is formed as an adjustment ring 10 and surrounds the star joint and is journalled so that it can slide on the outer wall of the individual arm of the star joint. Above the rotating grip is a horizontal bar 11 as a hand grip.

The fixed arm 6 is a telescopic arm, the length of which can be adjusted by means of a stop device 12 with a cross bar. The outer end of each fixed arm 6 is formed as a fork 13 with a receiving slit 14 and has a turnbuckle 15 (FIG. 5).
) Can be rotatably connected to the support leg 2.

The adjusting ring 10 has a plurality of locking recesses 16 on its lower edge facing the fixed arm 6.
The arrangement is shown in an exploded view of a portion of the inner wall of the adjustment ring 10 of FIG. In FIG. 4, the portion up to the dashed line corresponds to a circumferential angle of 120 ° of the adjusting ring and therefore corresponds to one fixed arm 6. For each fixed arm, different depths a, b, c and d as viewed from the lower edge of the adjustment ring
There are four locking recesses 16 having As the arrangement of the locking depressions repeats along the circumference, there are three groups of locking depressions each having one specific depth. As shown by the broken line with respect to the locking recess of the depth b,
It can fit into this locking recess. These locking recesses are such that when the fixed arm is fitted into the locking recess of depth a, the fixed arm becomes horizontal, and when the fixed arm is fitted into the locking recess of depth b, it forms an angle of 30 ° from the horizontal plane and has a depth c. The depth is changed stepwise so as to form an angle of 40 ° from the horizontal plane when it is fitted into the locking recess, and to make an angle of 50 ° from the horizontal plane when it is fitted into the locking recess of depth d. In order to improve the fit of the fixed arm, the locking recesses of depths b, c and d are provided with a slope 17 corresponding to a slope in which the upper side of the circular shape is close in cross section of the fixed arm.

In order to be able to easily adjust the individual locking positions for the fixed arm and to be able to reproduce each locking position, an individual lock is provided between the rotating grip 9 and the star joint 7. There is a spherical locking portion 18 that locks in the star joint at the locking position of.

When the position of the support leg 2 of the tripod 1 is changed, the rotary grip 9 is moved to a desired position, and the spherical locking portion 18 is locked in the star joint 7 at that position. Of course, this can also be carried out with the support leg 2 open, in which case the support leg comes out of the locking recess into which it is now fitted, and the adjustment rod 10 can be further rotated by means of the cross bar 11. Until the support legs can be easily folded. The entire tripod 1 can be completely folded and transported together with the central fixing device 4 incorporated. The maximum degree of opening is provided when all the fixed arms extend over their entire length and lie in a horizontal plane.

FIG. 5 shows an articulated connection between the fixed arm 6 and the support leg 2. As shown in FIG. 1, the support leg 2 whose length can be changed is composed of an upper member and a lower member each including a pair of columns. The upper member provided with the two columns 21 is closed at its lower end by a connecting bridge 22, and the supporting leg pair 23 of the lower member extends and connected inside the connecting bridge 22. The connecting bridge comprises two inwardly directed flanges 24 in which coaxial, spring-loaded latch bolts 25 are bearing. The latch bolt 25 includes a latch shaft that slides through the flange 24, a hand knob 28 located outside and supported by a pressure spring 29 against the flange 24, and a latch disk 30 having a diameter larger than the diameter of the latch shaft. Consists of This latch disk is in contact with the inside of the flange 24 when the pressure spring is extended.

To install the fixed arm 6 in the turnbuckle 15, the latch bolt 25 is moved inward and the fork is
Receiving slit 14 of fixed arm formed as 13
To move over the latch shaft 27. Subsequently, when the latch bolt 25 is loosened, the latch disk 30
Penetrates into the extended area 31 of the receiving slit,
This locks the fixed arm.

[Brief description of the drawings]

FIG. 1 is an overall view of a tripod provided with a central fixing device including three fixing arms and a central rotating grip according to the present invention.

FIG. 2 is a partially cutaway plan view showing a part of the central fixing device in which a fixing arm is expanded.

FIG. 3 is a longitudinal sectional view of a rotating grip and a fixed arm.

FIG. 4 is a part of a development view of a side wall of the rotating grip.

FIG. 5 is a partial cutaway view of a fixation for the outer end of the fixation arm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tripod 2 Support leg 3 Revolving head 4 Central fixing device 5 Housing part 6 Fixed arm 7 Star joint part 8 Axis 9 Rotating grip

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16M 11/34

Claims (8)

(57) [Scope of request for utility model registration] An outer end is provided on each supporting leg of the tripod.
Articulated , with the medial end pivoted to a common receptacle
Includes three fixed arms are, a fixed central device for a tripod is fixed to spread the supporting leg of the tripod even on undulating terrain position, accommodating portion for fixing the arm (6) (5)
Has a plurality of fixing parts (16) for the fixing arm (6).
The fixed arms (6) are provided with different fixed portions (1
In cooperation with 6), adjust the open positions of the three fixed arms (6).
Integer and, and opened determined by the position, fixed central device for tripods, characterized in that it is held by the opening angle equal to each other. 2. A tripod center fixing device according to claim 1, wherein the fixing portion is arranged on a common rotary grip. 3. A rotary grip (9) having an adjusting ring (1).
0), wherein the adjusting ring comprises, on the lower edge facing the fixed arm (6), a plurality of locking recesses (16) of different depths as fixed parts of the fixed arm (6). 3. The central fixing device for a tripod according to claim 2, wherein the fixing arm (6) fits into the locking recess. 4. The tripod center fixing device according to claim 3, wherein the rotating grip (9) comprises a hand clip (11) on the upper side opposite the fixing arm (6). 5. The star joint (7) and the star joint (7) to which the receiving part (5) is fixed with the rotating arm (6).
5. The central fixing device for a tripod according to claim 3 , comprising a rotary grip (9) surrounding the rotary arm, the rotary grip (9) having a fixing part (16) for the fixing arm (6). 6. 6. A tripod center fixing device according to claim 3, wherein the fixing arm is a telescopic arm. 7. An outer end of the fixing arm (6) is fixed to the support leg (2) by being held in a turnbuckle (15) for preventing accidental detachment. The center fixing device for a tripod according to any one of claims 3 to 6. 8. The turnbuckle (15) comprises two spring-loaded latch bolts (25) coaxially bearing in a flange (27), said latch bolts comprising a fixed arm (6). 8. The central fixing device for a tripod according to claim 7, wherein the fixing arm is fitted into a fork-shaped distal receiving slit and retains the fixing arm.