KR100914384B1 - A half-collet type ball-head for tripod supports - Google Patents

Abstract

A half-collet shaped ball-head for a tripod is provided to facilitate manipulation by increasing contact friction force with the expansion of the lower hemispherical part. A half-collet shaped ball-head(100) for a tripod comprises bodies(112,114) which are an outer case, a pair of ball races(122,124), a half-collet shaped ball(130), a stud bolt(142), and a pair of tapered inserts(140). The half-collet shaped ball is installed between a pair of ball races. A tapered hollow part(136) is formed at the center of the half-collet shaped ball. In the lower hemispherical part of the half-collet shaped ball, a plurality of slots are formed in a radial direction. The half-collet shaped ball has a collet shape. The tapered insert is inserted into the both sides of the tapered hollow part of the ball. The tapered insert moves toward the center with the rotation of the stud bolt. The lower hemispherical part of the ball is pressed and expanded.

Description

A Half-Collet Type Ball-Head for Tripod Supports}

The present invention relates generally to a tripod ball head, and more particularly, by forming a lower hemisphere portion of a sphere ball into a collet type shape and allowing a structure for fixing the ball to penetrate through the center of the ball. This invention relates to a new half-collet type ball head for tripods, which can be easily adjusted and the contact friction force for fixing the ball is increased, thereby simplifying operation and reducing the number of parts.

In general, a ball head type or a lever fixing method is known as a device for rotating and fixing a specific device such as a camera or a surveying device at a specific angle on a tripod. In the case of lever fixing method, since three or more separate levers are required for lateral yaw, yaw and yaw motion, the configuration is complicated and the process of adjusting to a desired angle is cumbersome and difficult. Ball head type devices, on the other hand, generally offer the advantage that the desired angle can be obtained by adjusting only the ball as a spherical ball shape.

In general, the ball head of the spherical type is relatively easy to adjust to a desired angle because the rolling, pitching, yawing movement is free, but there is a problem that a relatively large friction force is required to fix at any angle. . Many examples are known in the art which use eccentric cams or bolts or wedge type additional means to provide such frictional forces.

For example of a conventionally known spherical ball head type, Korean Patent Application No. 10-1999-0030384, the registered publication of the invention "multipurpose ball head for industrial and tripod", is shown in Figure 1 attached to this specification As described above, the spherical ball 12 is inserted into and assembled from the upper end of the body 10, which is an empty case, between the body 10 and the ball 12 which are rotatably fixed with respect to the lower rotating plate 32. The upper side portion is provided with a C-type ball race 16 having a wedge-shaped cross section, and the lower side portion is provided with a lower ball race 19 also having a wedge-shaped cross section to have a structure for sliding contact with the ball 12. . The upper part of the ball 12 is formed to protrude a structure for fastening the device. When holding and moving this fastening structure, the ball 12 is rotatable in all three direction axes. To fix the ball 12, turning the ball fixing knob 23 on the right, the stud bolt 24 connected to the handle 23 and extended below the ball is inserted. Then, the feed cam 19, which is screwed symmetrically at two positions of the stud bolt 24, is moved symmetrically from the center to the side, while the lower ball race 17 is applied to the force pushed by the feed cam 19. Is pressed upwards. Accordingly, the lower ball race 17 pushes the ball 12 upwardly and closely adheres, and the metal ball 12 has an upper ball race 16 made of an engineering carbon plastic material and a lower ball race 17. It can be fixed in close contact with each other.

However, the prior art has a fundamental disadvantage that the outer shape of the ball 12 is a perfect sphere, and it is difficult to provide sufficient frictional force for fixing the ball 12. Therefore, when fastening a device having a relatively heavy weight on the fastening structure formed on the upper part of the ball 12, the lower ball race 17, the transfer cam 19 and the stud bolt 24 are applied by the force applied to the lower side of the ball. It is easy to occur when the fixing device is released in the opposite direction as in the fixing operation and eventually the fixed state of the fastened device is released.

Therefore, in the prior art, the auxiliary fixing means is further provided on the handle 23 side to prevent the loosening of the stud bolt 24, and the auxiliary fixing means is also provided between the rotating plate 32 and the stud bolt 24. Further examples are shown. As described above, in the prior art, there is a problem in that the number of parts for fixing the spherical balls is large, the structure is complicated, and manufacturing cost is high. In addition, in order for the user to fasten the device and adjust the desired angle, after holding the ball 12 with one hand and adjusting it to the desired angle, the other hand should be fixed by turning the handle 23, so that both hands are installed. You will need it for your work. This is a problem that operation is inconvenient, for example, when hand shake occurs, such as when dealing with a camera having a relatively heavy weight, and the like is likely to be fixed in a state where the device is out of a desired angle.

Therefore, in a tripod ball head for mounting a specific device on a tripod and fixing it at a desired angle, in particular, the ball head of a spherical shape can be adjusted at a desired angle while the operation is increased by increasing the contact friction force for fixing the ball head. There is still a need for a new ball head that is simple and reduces the number of parts.

The present invention has been invented to solve the problems of the above-described conventional tripod ball head structure for a tripod, and the elasticity in the radial direction of the lower hemisphere portion of the spherical ball for fixing a specific device on a tripod and fixed at a desired angle By forming a collet type shape for adding and penetrating the structure for fixing the ball through the center of the ball, the contact friction force for fixing the ball can be easily adjusted to the desired angle, It is an object of the present invention to provide a new tripod half-collet type ball head which is easy to operate and reduces the number of parts.

This object is achieved by a tripod half-collet type ball head provided according to the invention.

Tripod half-collet type ball head according to an embodiment of the present invention, by forming a fastening plate integrally on the top of the spherical ball, for the tripod for adjusting and fixing the device fastened on the fastening plate at a desired angle A ball head comprising: a body which is an outer case rotatably coupled to yawing on a rotating plate coupled to a tripod; A pair of ball races provided in the body; Half having a collet-type shape installed between the pair of ball races and having a tapered hollow portion tapered at both sides at a central portion thereof, and having a lower hemisphere portion having a plurality of radial slots for adding elasticity in a radial direction. A collet type ball; A stud bolt inserted into the tapered hollow part of the ball and rotated by a handle installed outside the body; And a pair of tapered inserts inserted into both sides of the tapered hollow part of the ball and pressed to expand the lower hemisphere portion of the ball by moving toward the center by rotation of the stud bolt.

In a preferred embodiment, the tapered insert has a hollow tapered body having an inner surface with a screw groove formed in the center thereof, and a rotation preventing key protruding from the tapered body.

In a preferred embodiment, the collet structure of the half-collet type ball includes one open slot having both sides open at the bottom end thereof, and the same number of one end slots are formed symmetrically on both sides of the open slot. Structure.

In a preferred embodiment, the outer case body has a structure in which the lower body surrounding the lower hemisphere of the ball and the upper body surrounding the upper half of the ball are coupled to each other.

In a preferred embodiment, the lower ball race of the pair of ball races has at least one groove-shaped space.

According to the tripod half-collet type ball head of the present invention having the above-described configuration, the collet type for adding elasticity in the radial direction to the lower hemisphere portion for installing a specific device on a tripod and fixing it at a desired angle ( collet type), and the structure for fixing the ball penetrates the center of the ball so that the contact friction force for fixing the ball can be increased by the expansion of the lower hemisphere of the ball while being easily adjusted at a desired angle. This makes it simple and reduces the number of parts.

Hereinafter, a half-collet type ball head for a tripod of the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view showing the structure of a tripod half-collet type ball head according to an embodiment of the present invention, Figure 3 is a tapered insert of the structure of a tripod half-collet type ball head according to an embodiment of the present invention 4 is a schematic view showing the structure of 140, and FIG. 4 is a schematic view of the half-collet type ball head structure of the tripod half-collet type ball head according to an embodiment of the present invention seen from the hollow side of the center. .

As shown, the tripod half-collet type ball head 100 according to an embodiment of the present invention, the fastening plate 132 is integrally formed on the upper part of the spherical ball and provided with a fastening bolt 134 The ball head 100 for tripod for fixing and fixing the device is coupled to the fastening bolt 134 and supported on the fastening plate 132 at a desired angle. In particular, the present invention is characterized by using a collet-type ball structure in order to simplify the structure for fixing the spherical ball and at the same time increase the friction.

In general, collet type parts are well known in the field of chuck assemblies for holding tools. This collet has a structure in which a plurality of slots are formed on the tubular body, for example, as shown in US Pat. No. 7,261,302B2, to which elasticity is added in the radial direction.

The present invention applies such a conventional collet structure to the lower hemisphere portion of the ball so that the ball is expandable in the radial direction, and the adhesion by the expansion of the lower ball hemisphere and the unevenness due to the multiple slots formed in the lower hemisphere of the ball. It is conceived that sufficient frictional force for fixing the ball can be obtained by the phenomenon that the frictional force between the structure and the ball race is increased.

The ball head 100 of the present invention comprises a body 112, 114, a pair of ball races (122, 124), ball 130, stud bolt 142, tapered insert 140.

The bodies 112 and 114 are outer cases surrounding the ball 130. In the preferred embodiment, the bodies 112 and 114 have a structure in which the lower body 112 surrounding the lower half of the ball 130 and the upper body 114 surrounding the upper half of the ball 130 are coupled to each other. Do. A portion of the upper hemisphere of the ball 130 is exposed to the upper end of the upper body 114 and the fastening plate 132 protrudes. The bottom surface of the lower body 112 is rotatably coupled to the rotating plate 110.

For convenience of explanation, an axis connecting the fastening bolt 132 and the tripod bolt 120 of FIG. 2 will be referred to as a vertical axis, and a rotational motion about the vertical axis will be referred to as a yawing motion. In the present invention, since the rotating plate 110 is coupled to the tripod (not shown) by the tripod bolt 120, the body is rotatably coupled (yawing) on the rotating plate 110 coupled to the tripod.

Meanwhile, an axis that may be assumed by the handle 146 and the stud bolt 142 of FIG. 2 is referred to as a longitudinal axis, and a rotational motion about the longitudinal axis is referred to as a rolling motion. According to the present invention as will be described below, the ball 130 is capable of rolling movement around the stud bolt (142).

In addition, an axis perpendicular to the horizontal plane with respect to the longitudinal direction of the stud bolt 142 is called a horizontal axis, and a motion that rotates about this horizontal axis is called a pitching motion. In the case of the present invention, the longitudinal motion of the ball 130 is limited and impossible. However, the device coupled to the fastening plate 132 and the fastening bolt 134 on the top of the ball 130 is the body 112, 114 and the ball 130 for the transverse movement of the ball 130 and the rotating plate 110 By the yaw movement of) it is possible to obtain the desired angle sufficiently.

In the present invention, the ball 130 is provided between a pair of ball races (122, 124) provided in the body (112, 114). The ball races 124 and 122 are provided to have some gap with the surface of the ball 130 so that the ball 130 rotates freely when the ball 130 rotates. When the ball 130 is fixed, the ball 130 extends radially in a predetermined scale, so that the gap between the ball 130 and the ball races 122 and 124 is eliminated and the outer surface of the ball 130 is removed. And ball races 122 and 124 are in close contact with each other. According to a preferred embodiment of the present invention, the lower ball race 122 of the pair of ball races 124 and 122 includes at least one recessed portion 122a and 122b. The contact between the ball 130 and in particular the lower ball race 122 is augmented by a collet-shaped uneven structure formed in the lower hemisphere of the ball 130. In the example in which the lower ball race 122 itself is provided with recesses 122a and 122b having a recessed shape, the elasticity of the lower ball race 122 may be increased.

In the present invention, as described above, the ball 130 is characterized by having a collet structure in the lower hemisphere. That is, the ball 130 is installed between the pair of ball races (122, 124), both sides of the tapered hollow portion 136 tapered wide in the center portion and the lower hemisphere portion for adding elasticity in the radial direction It has the shape of a collet type comprising a plurality of radial slots 138, 139.

Here, the hollow portion 136 of the ball 130 is composed of tapered portions 136a and 136c having a tapered shape on both sides and a relatively narrow central waist portion 136b.

In the present invention, as shown in FIG. 4, the collet structure of the half-collet type ball 130 includes one open slot 139 having both sides opened at the bottom thereof, and both sides of the open slot 139. Therefore, it is preferable that the slot 138 having the same number of ends blocked is formed symmetrically. In the blocked slot 138, a slot in which the surface side of the ball is opened and a slot open in the tapered hollow portion 136 side of the ball are alternately formed. In this case, when a force to expand the ball 130 is applied, the lower hemisphere of the ball 130 is opened on both sides around the open slot 139, the expansion scale can be further increased.

The tapered hollow portion 136 of the ball 130 is inserted into the stud bolt 142 is rotated by the handle 146 installed outside the body.

When the stud bolt 142 is rotated, a pair of tapered insert 140 is moved toward the waist 136b of the hollow portion 136, respectively. The taper insert 140 is installed on both sides of the tapered hollow portion 136 of the ball, respectively, and moves to the center by the rotation of the stud bolt 142 to press and expand the lower hemisphere portion of the ball. This can be called.

As shown in FIG. 3, each taper insert 140 has a hollow tapered body 140a having an inner surface with a threaded groove formed therein, and an anti-rotation key 140b protruding from the tapered body 140a. It is provided. The anti-rotation key 140b is inserted into any one of the slots 138 formed in the lower hemisphere of the ball 130 to prevent the tapered insert 140 from freely rotating in the hollow part 136.

In the above, the present invention has been described through specific embodiments, but various modifications are possible to those skilled in the art by referring to and combining various features described herein. Therefore, it should be pointed out that the scope of the present invention should not be limited to the described embodiments, but should be interpreted by the appended claims.

As described above, the present invention relates to a ball head for fixing a desired angle by installing a device such as a camera, a telescope, a surveying device, a lighting device, and other industrial equipment on a tripod and rotating in various directions. As such, it is widely used in the field of ball head for fixing and fixing the device to a desired angle on a tripod.

1 is a partial cross-sectional view showing the structure of a spherical ball head for a tripod according to the prior art.

Figure 2 is a cross-sectional view showing the structure of a tripod half-collet type ball head according to an embodiment of the present invention.

Figure 3 is a schematic diagram showing the structure of the tapered insert 140 of the structure of the tripod half-collet type ball head according to an embodiment of the present invention.

Figure 4 is a schematic view of the structure of the half-collet type ball head of the structure of the tripod half-collet type ball head according to an embodiment of the present invention from the hollow side of the center.

<Description of the symbols for the main parts of the drawings>

100: half collet type ball head for tripod

110: rotating plate

120: tripod bolt

130: ball head

Claims (5)

In the ball head 100 for tripod for integrally forming a fastening plate on the top of the spherical ball, to adjust and fix the device fastened on the fastening plate at a desired angle, Bodies 112 and 114 which are outer cases rotatably coupled to yawing on a rotating plate 110 coupled to a tripod; A pair of ball races 122 and 124 provided in the bodies 112 and 114; A plurality of radial slots 138 installed between the pair of ball races 122 and 124 and having a tapered hollow portion 136 tapered at both sides at a central portion thereof, and having a lower hemisphere portion to add elasticity in a radial direction. A half-collet type ball 130 having a shape of a collet type comprising a 139; A stud bolt 142 inserted into the tapered hollow part 136 of the ball and rotated by a handle 146 installed outside the body; A pair of tapered inserts 140 are inserted into both sides of the tapered hollow part 136 of the ball and moved toward the center by the rotation of the stud bolt 142 to press and expand the lower hemisphere portion of the ball. A half-collet type ball head for tripod, characterized in that it comprises. The tapered insert 140 of claim 1, wherein the tapered insert 140 includes a hollow tapered body 140a having an inner surface with a threaded groove formed therein, and an anti-rotation key 140b protruding from the tapered body 140a. Half-collet type ball head for tripod characterized by the above-mentioned. 2. The collet structure of the half-collet type ball 130 according to claim 1, wherein the collet structure of the half-collet type ball 130 includes one open slot 139 having both sides open at the bottom thereof, and the same number of ends on both sides of the open slot 139. A half-collet type ball head for a tripod, characterized in that the closed slot 138 is formed symmetrically. According to claim 1, wherein the outer case body 112, 114 is coupled to each other the lower body 112 surrounding the lower hemisphere of the ball 130 and the upper body 114 surrounding the upper half of the ball 130 The half-collet type ball head for tripod characterized by having a structure which became. The half ball tripod according to claim 1, wherein the lower ball race 122 of the pair of ball races 124, 122 has at least one groove-shaped space portion 122a, 122b. Collet type ball head.

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