Quick Attach Mechanism

Abstract

To provide a quick mounting mechanism which not only facilitates quick installation but also has an excellent locking effect, is simple in structure, has a small number of parts, and has low production costs. [Solution] The quick attachment mechanism includes a base 1, a movable block 2, a lock block 3, a quick attachment base, and a plate clamp assembly, the movable block and the lock block engage with the front surface of the base and surround it to form a dovetail groove, one end of the movable block is rotatably connected on the rotation axis 7 of the base, the movable block rotates in a direction pressing the base under the action of a torsion spring, the lock block is movably attached to one side of the base, the plate clamp assembly includes a pulling rod 53 and a plate clamp 51, when the plate clamp is in a loose position, the quick attachment base can be pressed into the dovetail groove from the front surface of the base, and when the plate clamp is in a locked position, the lock block and the movable block cooperate to lock the quick attachment base in the dovetail groove.

Description

[Technical field]

[0001] The present invention relates to the field of photography equipment technology, and more particularly to a quick attachment mechanism. [Background technology]

[0002] A conventional quick-attach mechanism on a camera platform includes a panel base, a quick-attach base, and a clamping mechanism, a chute is provided on the panel base, the quick-attach base is horizontally slidably mounted on the chute, and the clamping mechanism is used to lock the quick-attach base on the chute after the quick-attach base slides horizontally to a predetermined position. When the quick-attach base is mounted, it only slides horizontally into the chute of the panel base, and the quick-attachment from top to bottom of the quick-attach base cannot be realized, so the installation time of the quick-attach base is relatively long, and the photographer may miss important shooting scenes during the long quick-attach base assembly process, which may affect the shooting experience.

[0003] In order to facilitate the quick mounting base to be quickly mounted on the panel base from top to bottom, in some quick mounting mechanisms, a slide block is installed on the back of the panel base, a lock block is rotatably connected to one side of the slide block, a plate clamp is connected to the side of the slide block away from the lock block to slide the movable block, and a return spring is elastically installed between the slide block and the panel base. The plate clamp has a locking state and a loosening state during rotation, when the plate clamp is in the locking state, the slide block moves toward the plate clamp, the return spring is compressed, and the slide block drives the locking block to lock the quick mounting base in the locking groove, and when the plate clamp is in the loosening state, the return spring drives the slide block and the lock block to move in the direction of loosening the quick mounting base, at this time the quick mounting base is loosened and the quick mounting base can be taken out of the locking groove of the panel base.

[0004] Such a quick mounting mechanism can realize the quick mounting of the quick mounting base from the top down. However, when the plate clamp is in a locked state, the locking force applied by the plate clamp is transmitted to the lock block through the slide block, and the lock block and the panel base need to press the quick mounting base from both sides to achieve locking. Since one end of the lock block is rotatably connected on the slide block, a small fitting gap inevitably exists between the lock block and the slide block. When the plate clamp rotates from the loose state to the locked state to pull the slide block through a certain movement distance, due to the existence of this fitting gap, the actual movement distance of the lock block during movement lock is smaller than the movement distance of the plate clamp, and the locking force actually applied by the lock block to the quick mounting base is slightly smaller than the locking force applied by the plate clamp, which affects the locking effect of the quick mounting base. In order to install the slide block on the back side of the panel base so that it can slide horizontally, it is necessary to install an additional baffle and lock screw to limit the slide block to the panel base. This requires a relatively large number of components to be installed, the overall structure is relatively complicated, and the production cost is high. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the poor locking effect and complicated locking structure of the quick attachment mechanism of the prior art that can realize quick top-down installation of the quick attachment base, thereby providing a quick attachment mechanism. [Means for solving the problem]

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] A quick-attach mechanism includes a base, a movable block, a lock block, a quick-attach base, and a plate clamp assembly, the movable block and the lock block being located on opposite sides of the base, respectively, the movable block and the lock block being engaged with the front surface of the base and surrounding it to form a dovetail groove, a rotating shaft being attached to the rear surface of the base, one end of the movable block being rotatably connected to the rotating shaft, a torsion spring being wound on the rotating shaft, one end of the torsion spring being abutted against the base and the other end being abutted against the movable block, the elastic force of the torsion spring driving the movable block to rotate in a direction pressing against the base, and the lock block being movable to one side of the base along a connecting direction between the lock block and the movable block. a plate clamp assembly including a tension rod having one end connected on the base and installed through the lock block, and a plate clamp located on a side of the lock block away from the base and rotatably connected to an end of the tension rod, the plate clamp having a locked position and a loosened position during rotation, when the plate clamp is in the loosened position, the quick attachment base can be pressed into the dovetail groove from the front side of the base, and when the plate clamp is in the locked position, the plate clamp urges the lock block to move in a direction adjacent to the movable block, and the lock block and the movable block cooperate to lock the quick attachment base in the dovetail groove.

[0008] Furthermore, a movable block ramp is provided on the movable block, forming one groove side wall of the dovetail groove, a lock block ramp is provided on the lock block, forming another groove side wall of the dovetail groove, a first ramp is provided on one side of the quick attachment base, which engages with the ramp of the movable block ramp, and a second ramp is provided on the other side of the quick attachment base, which engages with the ramp of the lock block ramp.

[0009] Furthermore, when the plate clamp is in the locked position, the movable block ramp surface and the first ramp surface are in an undercut condition.

[0010] Furthermore, one side of the movable block protrudes outward to facilitate pressing the press button of the movable block.

[0011] Furthermore, a screw hole and a guide groove are provided on the side of the base facing the lock block, one end of the pulling rod is connected to the screw hole by screw fastening, and a guide post that fits the outer shape of the guide groove and is slidably connected within the guide groove is provided on the lock block.

[0012] Furthermore, a return spring is provided in the guide groove to elastically support the guide groove between the bottom of the guide groove and the guide post, and when the plate clamp is in the loosened position, the elastic force of the return spring drives the lock block to move in a direction away from the movable block.

[0013] Moreover, the clamp assembly further includes a clamp shaft fixedly connected to an end of the tension rod, the end of the clamp connected to the clamp shaft being an eccentric block, the eccentric block being rotatably connected on the clamp shaft, a proximal end of the eccentric block abutting the lock block when the clamp is in a release state, and a distal end of the eccentric block abutting the lock block when the clamp is in a locked state.

[0014] Furthermore, an accommodating groove is further provided on the side of the lock block facing the plate clamp, and the plate clamp assembly further includes a pressing block that is fitted into the accommodating groove and externally fitted onto the outer periphery of the tension rod, and the pressing block is disposed between the eccentric block of the plate clamp and the lock block.

[0015] Furthermore, at least two elastic spacers are further disposed between the pressing block and the bottom of the receiving groove.

[0016] Furthermore, a rotation shaft hole is drilled on the base, both ends of the rotation shaft are fixed within the rotation shaft hole, a mounting groove is provided on the back surface of the base, the rotation shaft is installed by passing through the mounting groove, a connection hole is provided in a portion of the back surface of the base where the mounting groove is not provided, and a connection screw for connecting to an external tripod head is screwed into the connection hole. Effect of the Invention

[0017] The technical solution of the present invention has the following advantages:

[0018] 1. The quick mounting mechanism of the present invention includes a base, a movable block, a locking block, a quick mounting base, and a plate clamp assembly. The movable block and the locking block are located on opposite sides of the base. A dovetail groove for locking the quick mounting base is formed by the engagement of the movable block, the locking block, and the base. The base is only the bottom wall of the dovetail groove, and the two opposite side walls of the dovetail groove are respectively formed by the movable block and the locking block. The movable block is rotatably connected to one side of the base through a rotating shaft and a torsion spring. Since the movable block is rotatably coupled, the quick mounting base can be quickly installed in the dovetail groove from above to below by pressing downwards. When the quick mounting base is locked, , the plate clamp is rotated, and the plate clamp urges the locking block to move in a direction approaching the movable block, so that the quick mount base can be locked in the dovetail groove through the cooperation of the locking block and the movable block. In this type of quick mount base locking method, the locking force provided by the plate clamp only needs to urge one member, the locking block, to move. When the plate clamp rotates from the loosening position to the locking position, the movement stroke along the pulling rod is the movement stroke of the locking block, and the locking force can be fully applied on the quick mount base through the locking block, which is favorable to improving the locking effect of the quick mount base, and the overall structure is simple with fewer parts, which is favorable to reducing the production costs of the quick mount mechanism.

[0019] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces drawings that need to be used in the embodiments of the present invention or the prior art description. It is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without exerting creative efforts. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic perspective view of a quick attachment mechanism according to an embodiment of the present invention; [Diagram 2] 2 is a schematic structural diagram of the base and the quick attachment base according to the embodiment of the present invention before they are assembled; [Diagram 3] 4 is a schematic diagram of the rear structure of the base according to the embodiment of the present invention; [Figure 4] FIG. 2 is an exploded view of the quick attachment mechanism according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The following clearly and completely describes the technical solution of the present invention in conjunction with the drawings, and it is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained based on the embodiments of the present invention without the creative efforts of those skilled in the art are all within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be explained that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are orientations or positional relationships shown based on the drawings, and are only for facilitating and simplifying the description of the present invention, and do not indicate or imply that the devices or elements mentioned have a specific orientation and must be configured and operated in a specific orientation, and should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be explained that unless otherwise clearly specified and limited, the terms "attached", "interconnected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the insides of two components communicate with each other. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] The quick attachment mechanism as shown in Figures 1 to 4 includes a base 1, a movable block 2, a lock block 3, a quick attachment base 4, and a plate clamp assembly 5. Here, the base 1 is a flat plate structure, the base 1 includes a front surface 1a and a back surface 1b that are installed opposite to each other, the movable block 2 and the lock block 3 are respectively located on opposite sides of the base 1, the movable block 2 and the lock block 3 are engaged with the front surface 1a of the base 1 and surround it to form a dovetail groove, the front surface 1a of the base 1 forms a groove side wall of the dovetail groove, and the movable block 2 and the lock block 3 form the groove side wall of the dovetail groove. A rotating shaft 7 is attached to the back surface 1b of the base 1, one end of the movable block 2 is rotatably connected to the rotating shaft 7, and a torsion spring 8 is wound around the rotating shaft 7, one end of the torsion spring 8 abuts against the base 1, and the other end abuts against the movable block 2, and the elastic force of the torsion spring 8 drives the movable block 2 to rotate in a direction pressing against the base 1. The lock block 3 is movably attached to one side of the base 1 along the connecting direction between the lock block 3 and the movable block 2, and the quick-attaching base 4 is detachably connected in the dovetail groove. The plate clamp assembly 5 includes a tension rod 53, one end of which is connected to the base 1 and installed through the lock block 3, and a plate clamp 51, which is located on the side of the lock block 3 away from the base 1 and is rotatably connected to the end of the tension rod 53. The plate clamp 51 has a locking position and a loosening position during rotation, and when the plate clamp 51 is in the loosening position, the quick attachment base 4 can be pressed into the dovetail groove from the front surface 1a of the base 1, and when the plate clamp 51 is in the locking position, the plate clamp 51 urges the lock block 3 to move in a direction approaching the movable block 2, so that the lock block 3 and the movable block 2 cooperate to lock the quick attachment base 4 in the dovetail groove.

[0025] In this embodiment, a movable block inclined surface 21 is provided on the movable block 2, which forms one groove side wall of the dovetail groove, a lock block inclined surface 31 is provided on the lock block 3, which forms another groove side wall of the dovetail groove, a first inclined surface 41 is provided on one side of the quick-fitting base 4, which engages with the inclined surface of the movable block inclined surface 21, and a second inclined surface 42 is provided on the other side of the quick-fitting base 4. During the locking of the quick-fitting base 4, the plate clamp 51 drives the lock block 3 to move by the pulling rod 53, and the lock block 3 presses down the first inclined surface 41 on the quick-fitting base 4 by the lock block inclined surface 31, and cooperates with the movable block 2 to press the quick-fitting base 4 down onto the base 1. When the plate clamp 51 is in the locking position, the movable block inclined surface 21 and the first inclined surface 41 are in an undercut state.

[0026] In this embodiment, one side of the movable block 2 protrudes outward to facilitate pressing the pressing button 22 of the movable block 2 .

[0027] In this embodiment, a screw hole 12 and a guide groove 13 are provided on the side of the base 1 facing the lock block 3, one end of the pulling rod 53 is connected to the screw hole 12 by screw fastening, and a guide post 32 is provided on the lock block 3, which matches the outer shape of the guide groove 13 and is slidably connected to the guide groove 13. There are two guide grooves 13 and two corresponding guide posts 32, and the two guide grooves 13 are located on opposite sides of the screw hole 12. In each guide groove 13, a return spring 6 is provided between the groove bottom of the guide groove 13 and the guide post 32, and when the plate clamp 51 is in the loosening position, the elastic force of the return spring 6 drives the lock block 3 to move in the direction away from the movable block 2.

[0028] In this embodiment, the plate clamp assembly 5 further includes a plate clamp shaft 52 fixedly connected to an end of the tension rod 53, and the end of the plate clamp 51 connected to the plate clamp shaft 52 is an eccentric block, which is rotatably connected on the plate clamp shaft 52, and when the plate clamp 51 is in a loose state, the proximal end of the eccentric block abuts against the lock block 3, and when the plate clamp 51 is in a locked state, the distal end of the eccentric block abuts against the lock block 3. The side of the lock block 3 facing the plate clamp 51 is an arc surface, and in order to facilitate the plate clamp 51 pressing the lock block 3, a receiving groove 33 is provided on the side of the lock block 3 facing the plate clamp 51, the entire receiving groove 33 is rectangular, and the groove bottom of the receiving groove 33 is flat. The plate clamp assembly 5 further includes a pressure block 54 that is fitted into the accommodating groove 33 and fitted around the outer periphery of the pulling rod 53, and the outer size of the pressure block 54 is the same as that of the accommodating groove 33. The pressure block 54 is disposed between the eccentric block of the plate clamp 51 and the lock block 3, which facilitates increasing the pressure-bearing area of ​​the lock block 3 and allows the lock block 3 to better bear force.

[0029] In addition, three elastic spacers are placed between the pressing block 54 and the bottom of the accommodating groove 33. The three elastic spacers utilize their own elasticity and compressibility to effectively eliminate the gap on the contact surface between the pressing block 54 and the lock block 3, and can transmit the force received by the pressing block 54 more smoothly onto the lock block 3.

[0030] In this embodiment, a rotary shaft hole 11 is opened on the base 1, and both ends of the rotary shaft 7 are fixed in the rotary shaft hole 11. An attachment groove is provided on the back surface 1b of the base 1, the rotary shaft 7 is installed through the attachment groove, and the end of the movable block 2 connected to the rotary shaft 7 is just buried in the attachment groove. A connection hole is provided on the back surface 1b of the base 1 where no attachment groove is provided, and a connection screw 9 for connecting to an external pan head is screwed onto the connection hole. With this design, the structure of the base 1 is simple, so there is no need to design a complex structure such as a slide block inside the base 1, and the back surface 1b of the base 1 has a relatively large structural design space, so that it is easy to install a connection screw 9 for connecting to an external pan head on the back surface 1b of the base 1, and the use scenarios of the quick attachment mechanism can be further enriched.

[0031] The assembly process of such a quick-fit mechanism is as follows: When the quick-fit base 4 is installed, the plate clamp 51 is in an open state, and the quick-fit base 4 can be pressed from above to below to be installed; after the quick-fit base 4 presses the movable block 2, the movable block 2 rotates downward along the rotation axis 7 by a certain angle, and then the movable block 2 can avoid the quick-fit base 4, and the quick-fit base 4 can be directly pressed down to the front surface 1a of the base 1; at this time, the movable block 2 is released from the pressure of the quick-fit base 4, and the movable block 2 rotates upward along the rotation axis 7 under the action of the torsion spring 8, and a part of the movable block 2 rotates upward to the top of the quick-fit base 4, and further presses down the plate clamp 51; under the action of the tension rod 53, the lock block 3 moves in the direction close to the movable block 2, and after the lock block inclined surface 31 contacts the second inclined surface 42 of the quick-fit base 4, the lock block 3 moves in the direction close to the movable block 2, and the lock block inclined surface 31 contacts the second inclined surface 42 of the quick-fit base 4, and the lock block 3 moves in the direction close to the movable block 2 ... 2, the quick attachment base 4 is driven to move in a direction approaching the movable block 2, until the first inclined surface 41 of the quick attachment base 4 and the movable block inclined surface 21 are pressed against each other. At this time, the lock block 3 can press the quick attachment base 4. At this time, when the movable block 2 is pressed further downward, the movable block 2 cannot be pressed down because the movable block inclined surface 21 of the movable block 2 and the first inclined surface 41 of the quick attachment base 4 are in an undercut state. When the quick attachment base 4 is released, the plate clamp 51 is simply loosened, and the lock block 3 moves in a direction away from the movable block 2 under the action of the return spring 6. When the movable block 2 is pressed down, the movable block inclined surface 21 is detached from the first inclined surface 41 of the quick attachment base 4. At this time, the quick attachment base 4 can be taken out from the bottom up.

[0032] In the quick mounting structure according to the embodiment of the present invention, the movable block 2 and the lock block 3 are located on opposite sides of the base 1, and the dovetail groove for locking the quick mounting base 4 is formed by the engagement of the movable block 2, the lock block 3 and the base 1. The base 1 is only the bottom wall of the dovetail groove, and the two opposite side walls of the dovetail groove are respectively formed by the movable block 2 and the lock block 3. The movable block 2 is rotatably connected to one side of the base 1 via the rotating shaft 7 and the torsion spring 8. Since the movable block 2 is rotatably coupled, the quick mounting base 4 can be quickly mounted in the dovetail groove from top to bottom by pressing downward. When the quick mounting base 4 is locked, the plate clamp 51 is rotated, and the plate clamp 51 is rotated to lock the lock. The locking block 3 is urged to move in a direction close to the movable block 2, and the locking block 3 and the movable block 2 cooperate to lock the quick attachment base 4 in the dovetail groove. In this locking method of the quick attachment base 4, the locking force provided by the plate clamp 51 only needs to urge one component, the locking block 3, to move. When the plate clamp 51 rotates from the loosening position to the locking position, the movement stroke along the pulling rod 53 is the movement stroke of the locking block 3, and the locking force can be applied on the quick attachment base 4 through the locking block 3, which is favorable to improving the locking effect of the quick attachment base 4, and the overall structure is simple and the number of parts is small, which is favorable to reducing the production cost of the quick attachment mechanism.

[0033] Obviously, the above embodiment is merely an example for clarity of explanation, and is not intended to limit the embodiments. Those skilled in the art can make other different types of changes or variations based on the above description. It is not necessary and cannot be possible to cover all the embodiments here. And the obvious changes or variations derived thereby still fall within the scope of protection of the present invention. [Explanation of symbols]

[0034] 1, base, 11, rotating shaft hole, 12, screw hole, 13, guide groove, 1a, front, 1b, back, 2, movable block, 21, movable block inclined surface, 22, push button, 3, lock block, 31, lock block inclined surface, 32, guide post, 33, receiving groove, 4, quick attachment base, 41, first inclined surface, 42, second inclined surface, 5, plate clamp assembly, 51, plate clamp, 52, plate clamp shaft, 53, tension rod, 54, pressing block, 55, elastic spacer, 6, return spring, 7, rotating shaft, 8, torsion spring, 9, connecting screw.

Claims

1. A quick-attach mechanism includes a base (1), a movable block (2), a lock block (3), a quick-attach base (4), and a plate clamp assembly (5), the movable block (2) and the lock block (3) are located on opposite sides of the base (1), the movable block (2) and the lock block (3) are engaged with the front side (1a) of the base (1) and surround it to form a dovetail groove, a rotating shaft (7) is attached to the back side (1b) of the base (1), and the movable block (2) and the lock block (3) are engaged with the front side (1a) of the base (1) to form a dovetail groove. One end of the lock block (2) is rotatably connected to the rotating shaft (7), and a torsion spring (8) is wound around the rotating shaft (7), one end of the torsion spring (8) abuts against the base (1), and the other end abuts against the movable block (2). The elastic force of the torsion spring (8) drives the movable block (2) to rotate in a direction pressing against the base (1), and the lock block (3) is movably moved toward one side of the base (1) along the connection direction between the lock block (3) and the movable block (2). The quick-attach base (4) is detachably connected in the dovetail groove, the clamp assembly (5) includes a tension rod (53) having one end connected on the base (1) and installed through the lock block (3), and a clamp (51) located on the side of the lock block (3) away from the base (1) and rotatably connected to the end of the tension rod (53), the clamp (51) having a lock position and a release position during rotation, and the clamp (51) is When the clamp (51) is in the loosening position, the quick attachment base (4) can be pressed into the dovetail groove from the front surface (1a) of the base (1), and when the plate clamp (51) is in the locking position, the plate clamp (51) urges the lock block (3) to move in a direction approaching the movable block (2), so that the lock block (3) and the movable block (2) cooperate to lock the quick attachment base (4) in the dovetail groove.

2. 2. The quick attachment mechanism according to claim 1, characterized in that the movable block (2) is provided with a movable block ramp (21) forming one groove side wall of the dovetail groove, the lock block (3) is provided with a lock block ramp (31) forming another groove side wall of the dovetail groove, one side of the quick attachment base (4) is provided with a first ramp (41) engaging with the ramp of the movable block ramp (21), and the other side of the quick attachment base (4) is provided with a second ramp (42) engaging with the ramp of the lock block ramp (31).

3. 3. The quick attachment mechanism of claim 2, wherein the movable block ramp surface and the first ramp surface are in an undercut state when the plate clamp is in the locked position.

4. 2. The quick attachment mechanism according to claim 1, wherein one side of the movable block (2) protrudes outward to facilitate pressing a pressing button (22) of the movable block (2).

5. The quick attachment mechanism according to claim 1, characterized in that the base (1) is provided with a screw hole (12) and a guide groove (13) on the side facing the lock block (3), one end of the pulling rod (53) is connected to the screw hole (12) by screw fastening, and a guide post (32) that fits the outer shape of the guide groove (13) and is slidably connected within the guide groove (13) is provided on the lock block (3).

6. The quick attachment mechanism according to claim 5, characterized in that a return spring (6) is provided in the guide groove (13) between the groove bottom of the guide groove (13) and the guide post (32) for elastic support, and when the plate clamp (51) is in the loosening position, the elastic force of the return spring (6) drives the lock block (3) to move in a direction away from the movable block (2).

7. 7. The quick attachment mechanism of claim 6, wherein the clamp assembly (5) further comprises a clamp shaft (52) fixedly connected to an end of the tension rod (53), and the end of the clamp (51) connected to the clamp shaft (52) is an eccentric block, the eccentric block being rotatably connected on the clamp shaft (52), a proximal end of the eccentric block abutting against the lock block (3) when the clamp (51) is in a loose state, and a distal end of the eccentric block abutting against the lock block (3) when the clamp (51) is in a locked state.

8. The quick-attaching mechanism according to claim 7, characterized in that the lock block (3) is further provided with an accommodating groove (33) on a side facing the plate clamp (51), the plate clamp assembly (5) further includes a pressing block (54) fitted into the accommodating groove (33) and fitted onto the outer periphery of the pulling rod (53), and the pressing block (54) is interposed between the eccentric block of the plate clamp (51) and the lock block (3).

9. 9. The quick attachment mechanism according to claim 8, further comprising at least two elastic spacers (55) disposed between the pressing block (54) and the bottom of the receiving groove (33).

10. The quick attachment mechanism according to claim 1, characterized in that a rotating shaft hole (11) is opened on the base (1), both ends of the rotating shaft (7) are fixed in the rotating shaft hole (11), an attachment groove is provided on the back surface (1b) of the base (1), the rotating shaft (7) is installed by passing through the attachment groove, a connection hole is provided in a part of the back surface (1b) of the base (1) where the attachment groove is not provided, and a connection screw (9) for connecting to an external tripod head is screwed into the connection hole.

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