JPH028194B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a tripod for supporting a camera, etc.
In particular, it relates to means for fixing a main body provided with legs and a supporting rod that is vertically movable on the main body and to which a pan head or the like is attached.

(Prior art) Conventionally, as described in Japanese Utility Model Publication No. 54-11875, a nut is screwed onto the end of a cylindrical part of a main body on which three legs are pivoted, and A sleeve is housed in the sleeve, and a receiving surface formed on the inner surface of the cylindrical portion and the nut are brought into contact with each other in the axial direction from opposite directions, and the sleeve, the receiving surface, and the nut are in contact with each other in the axial direction. The contact surface of the sleeve is an inclined surface that is inclined in the direction in which the diameter decreases toward the tip of the sleeve, and by rotating the nut back and forth and displacing the inclined surface portion of the sleeve in the radial direction, it is possible to slide the sleeve in the axial direction. A tripod is known in which the sliding resistance of a freely inserted support rod can be adjusted.

In addition, in the tripod described in the above publication, the screw screwed into the main body is pressed radially and inwardly by the sleeve, and the sleeve is pressed against the support rod in the same direction, so that the main body and the support rod are connected. A fixing means is used to fix the main body and the support rod, but by tightening the nut as described above and pressing the inclined surface part of the sleeve against the support rod in the radial direction and inwardly, the tightening method fixes the main body and the support rod. A nut type fixing means is also used.

By the way, although the above-mentioned fixing means alone can sufficiently fix the support rod to the main body in the axial direction, it cannot sufficiently fix it in the circumferential direction, that is, prevent it from rotating. Therefore, conventionally, as a rotation preventing means, for example, a structure in which a convex key part formed on the inner surface of the cylindrical part of the main body is fitted into a groove part formed in the support rod extending in the axial direction through a groove part formed in the sleeve has been used. It is taken.

(Problems to be Solved by the Invention) However, with the above-mentioned conventional rotation prevention means,
The convex key part of the main body can be press-fitted into the groove of the sleeve, but since the support rod must be able to slide freely relative to the main body and sleeve, the convex key part should fit slightly into the groove of the support rod. Since they must be fitted with sufficient margin, there is a problem that the rotation of the sleeve and support rod cannot be sufficiently prevented, resulting in looseness in the circumferential direction.

The present invention aims to solve these problems, and aims to provide a tripod that can sufficiently fix the main body, sleeve, and support rod not only in the axial direction but also in the circumferential direction. It is something to do.

[Structure of the invention]

(Means for Solving the Problems) The tripod of the present invention includes a main body 1 provided with three legs 2, a cylindrical portion 3, and a pressing body 11 pivoted around the end of the cylindrical portion 3. The substantially cylindrical sleeves 21 and 22 are housed in the cylindrical portion 3, and one end of the sleeves 21 and the other end The receiving surface 4 formed on the inner surface of the cylindrical portion 3 and the pressing body 11 are brought into contact with each other in the axial direction and from mutually opposite directions, and the sleeves 21, 22 and at least one of the receiving surface 4 and the pressing body 11 are brought into contact with each other in the axial direction and from opposite directions. The contact surfaces with the sleeves 21, 22 are inclined surfaces 4, 13, 23, 24 that are inclined in a direction in which the diameter decreases toward the tips of the sleeves 21, 22, and the inclined surfaces 23, 2 of the sleeves 21, 22 are
4 is displaceable in the radial direction, and the sleeves 21,
A substantially cylindrical support rod 41 is fitted into 22 so as to be slidable in the axial direction, and the sleeves 21 and 22 are divided into two in the axial direction, and both sleeves 2
1, 22 Slanted surfaces 27b, 28 whose contact surfaces facing each other in the axial direction are inclined in a certain direction with respect to the circumferential direction.
b, and further includes the main body 1 and sleeves 21 and 2.
A first rotation prevention means 51 is provided for preventing rotation of the sleeve 2 by the pressing body 11.
1 and 22, both sleeves 2 are tightened.
A second rotation preventing means 52 is provided for preventing rotation of the sleeves 21, 22 and the support rod 41 by a force applied to the sleeves 21, 22 in the circumferential direction and in mutually opposite directions.

(Function) In the tripod of the present invention, when the pressing body 11 is tightened, the pressing body 11 and the receiving surface 4 of the main body 1 sandwich the sleeves 21 and 22 in the axial direction, and the sleeve 2
1 and 22 in the axial direction, and the contact surface between the sleeves 21 and 22 and the receiving surface 4 or the pressing body 11 is inclined in the direction in which the diameter is reduced toward the tips of the sleeves 21 and 22. ,13,23,
24, the inclined surfaces 23 and 24 of the sleeves 21 and 22 are displaced radially and inwardly to press the support rod 41 in the same direction, and this support rod 41
The main body 1 is fixed in the axial direction via sleeves 21 and 22. At this time, since the axially opposing contact surfaces of the sleeves 21 and 22, which are divided into two in the axial direction, are inclined surfaces 27b and 28b that are inclined in a constant direction with respect to the circumferential direction, both the sleeves 21 and 22 Forces are applied in the circumferential direction and in mutually opposite directions. Then, due to the force applied in the opposite direction, the second detent means 52
The sleeves 21, 22 and the support rod 41 are securely fixed in the circumferential direction. In addition, the first detent means 5
1 fixes the main body 1 and the sleeves 21, 22 in the circumferential direction. In this way, when tightening the pressing body 11, the main body 1, the sleeves 21, 22, and the support rod 41
will be surely integrated.

(Embodiment) Hereinafter, a first embodiment of the tripod of the present invention will be described based on FIGS. 1 to 6.

1 is a main body, and the upper ends of three legs 2 are pivoted to this main body 1. A substantially cylindrical cylindrical portion 3 whose axial direction is the vertical direction is formed in the center of the main body 1 . Further, at the lower part of the inner peripheral surface of this cylindrical part 3, an annular receiving surface 4 is formed which is an inclined surface that is inclined in a direction in which the diameter decreases downward. Grooves 5 extending in the axial direction are formed at symmetrical positions with respect to the central axis of 3.

And on the outer peripheral side of the upper end of the cylindrical part 3,
A nut 11 serving as a pressing body is screwed into the cylindrical portion 3 locally and movably in the axial direction thereof, and on the lower side of the circumferential surface of the central opening 12 of the nut 11,
An annular inclined surface 13 is formed which is inclined in a direction in which the diameter decreases upward. In addition, the cylindrical portion 3
The upper end of a cylindrical outer tube 14 is screwed onto the inner peripheral side of the lower end. Further, a pinion 15 is pivotally supported on the side of the cylindrical portion 3 so as to face the inside thereof, and this pinion 15 is provided with a handle 16.

Further, within the cylindrical portion 3, substantially cylindrical sleeves 21 and 22 which are divided into two in the axial direction are housed. Then, the upper first sleeve 2
An annular inclined surface 23 is formed at the upper end of the outer circumferential surface of the second sleeve 22 , and the annular inclined surface 23 is inclined upward, that is, in a direction in which the diameter decreases toward the tip of this sleeve 21 . An annular inclined surface 24 is formed in the direction in which the diameter decreases downward, that is, toward the tip of this sleeve 22, and the inclined surface 23 of the first sleeve 21 comes into contact with the inclined surface 13 of the nut 11. At the same time, the inclined surface 24 of the second sleeve 22 is in contact with the receiving surface 4, which is the inclined surface of the cylindrical portion 3.
That is, the nut 11 and the receiving surface 4 abut against the inclined surfaces 23 and 24 of the sleeves 21 and 22 in the axial direction and from opposite directions. Also,
A plurality of grooves 25, 26 extending in the axial direction are formed on the distal ends of the sleeves 21, 22, respectively, and the inclined surfaces 23, 24 are movable in the radial direction.

Further, the lower end of the first sleeve 21 and the second
A plurality of ratchet-shaped pawls 27 and 28 that engage with each other are formed at the upper end of the sleeve 22, respectively. Each claw 27, 28 has a vertical surface 27a, 28a extending in the axial direction.
and an inclined surface 2 inclined in a certain direction with respect to the circumferential direction.
7b, 28b, and the inclined surfaces 27b, 28b of both the sleeves 21, 22 are in contact with each other. That is, these inclined surfaces 27b, 2
8b is a contact surface of both the sleeves 21, 22 that face each other in the axial direction. Note that the sleeve 2 is located at a position facing the pinion 15.
1 and 22 have cutout portions 29 and 30 formed therein.

Furthermore, convex key portions 31 and 32 extending in the axial direction are formed on the inner circumferential surfaces of both the sleeves 21 and 22, respectively, at positions symmetrical about the central axis thereof. Then, the claw 27 on the first sleeve 21
The position of the convex key portion 31 with respect to the second sleeve 22 and the position of the convex key portion 32 with respect to the pawl 28 of the second sleeve 22 are slightly shifted by, for example, 6 degrees in the circumferential direction. Further, convex key portions 33 extending in the axial direction are formed on the inclined surface 24 at the lower end of the second sleeve 22 at symmetrical positions about the central axis thereof, and these convex key portions 33 are attached to the main body 1. They are press-fitted into the grooves 5 of the cylindrical portion 3 with no gaps.

Further, a substantially cylindrical support rod 1 is fitted into the sleeves 21 and 22 so as to be slidable in the axial direction, that is, in the vertical direction. Grooves 42 extending in the axial direction are formed on the outer circumferential surface of the support rod 41 at symmetrical positions about the central axis.
The convex key portions 31 and 32 of both sleeves 21 and 22 are fitted into these groove portions 42 so as to be slidable in the axial direction, respectively. In addition, the double-convex key parts 31 and 32
As mentioned above, the claws 27 and 28 of both sleeves 21 and 22 are slightly shifted as shown in FIG.
The vertical surfaces 27a and 28a of are located apart.
Further, a rack 43 extending in the axial direction is formed on the outer peripheral surface of the support rod 41, and the pinion 15 is meshed with this rack 43. Furthermore, a screw 4 for attaching a pan head or the like is provided protruding from the upper end surface of the support rod 41. Note that the outer cylinder 14 covers the support rod 41.

The groove portion 5 of the main body 1 and the convex key portion 33 of the inclined surface 24 of the second sleeve 22 constitute a first rotation preventing means 51 for preventing rotation of the main body 1 and the sleeves 21 and 22. The convex key portions 31, 33 on the inner peripheral surfaces of the sleeves 21, 22 and the groove portions 42 of the support rod 41 are connected to the sleeves 21, 22.
A second rotation prevention means 52 is formed to prevent rotation of the support rod 41 and the support rod 41 .

Next, the operation of the above embodiment will be explained.

When the nut 11 is loosened, turning the handle 16 releases the pinion 15 and the rack 43.
The support rod 41 can be moved up and down via the .
At this time, the convex key parts 31 and 32 of the first sleeve 21 and the second sleeve 22 slide in the groove part 42 of the support rod 41. Note that if the width of the convex key parts 31 and 32 is made slightly smaller than the width of the groove part 42, the support rod 41 can move up and down smoothly.

When the nut 11 is tightened, the sleeves 21, 2
The nut 11 and the receiving surface 4 of the main body 1 which sandwich the sleeves 21 and 22 in the axial direction press the sleeves 21 and 22 in the direction of shrinking them in the axial direction. 2
Since the inclined surfaces 4, 13, 23, and 24 are inclined in the direction in which the diameter decreases toward the tips of the sleeves 21 and 22, the inclined surfaces 23 and 24 of the sleeves 21 and 22 are displaced inward in the radial direction. and press the support rod 41 in the same direction. In this way, the main body 1 provided with the legs 2
On the other hand, for example, a support rod 41 that supports a camera is securely fixed in the axial direction via the sleeves 21 and 22.

Further, since the axially opposing contact surfaces of the sleeves 21 and 22 that are tightened in the axial direction by the nut 11 are inclined surfaces 27b and 28b that are inclined in a fixed direction with respect to the circumferential direction, the sleeves 21 and 22 are tightened in the axial direction by the nut 11. Forces are applied to 22 in the circumferential direction and in mutually opposite directions. Therefore, as shown in FIG. 3, the first sleeve 21 has its convex key portion 31 and support rod
This support rod 41 is pressed counterclockwise through the groove portion 42 of No. 1. On the other hand, as shown in FIG. 4, the second sleeve 22 presses the support rod 41 in the clockwise direction via its convex key portion 32 and groove portion 42. In this way, both sleeves 21, 2
2 presses the support rod 41 in mutually opposite directions in the circumferential direction, whereby these sleeves 21, 22 and the support rod 41 are reliably and firmly fixed in the circumferential direction and are prevented from rotating.

Further, as shown in FIG. 5, a groove 5 of the main body 1 and a second sleeve 22 press-fitted into the groove 5
The main body 1 and the sleeve 2 are connected through the convex key part 33 of
1 and 22 are fixed in the circumferential direction and prevented from rotating.

In this way, the support rod 41 can be
is securely fixed to the main body 1 in both the axial direction and the circumferential direction via the sleeves 21 and 22,
No rattling. Therefore, blurring during photographing can be reliably prevented.

Next, a second embodiment of the present invention will be described based on FIGS. 7 to 10.

The tripod of this second embodiment has basically the same structure as the tripod of the first embodiment, so corresponding parts are given the same reference numerals and explanation thereof will be omitted, and different parts will be omitted. This will be explained as the center.

Convex key portions 6 are formed on the receiving surface 4 of the main body 1 at symmetrical positions about the central axis of the cylindrical portion 3, each extending in the axial direction.

Further, convex key portions 31 extending in the axial direction are formed on the inner circumferential surface of the first sleeve 21 at positions symmetrical about the central axis thereof. On the other hand, the second
Grooves 34 extending in the axial direction are formed at symmetrical positions about the central axis of the sleeve 22, and the grooves 34 are formed in the lower end of the sleeve 22.
The convex key portions 6 are respectively fitted. The position of the convex key portion 31 relative to the claw 27 on the first sleeve 21 and the position of the groove portion 34 relative to the claw 28 on the second sleeve 22 are slightly shifted in the circumferential direction.

Further, the convex key portions 31 of the first sleeve 21 are fitted into the groove portions 42 of the support rod 41 so as to be slidable in the axial direction, and the main body protrudes from the groove portion 34 of the second sleeve 22. One convex key portion 6 is fitted to be slidable in the axial direction. Note that the convex key portions 3 of both sleeves 21 and 22
1 and the groove 34 are slightly misaligned as described above, so as shown in FIG.
The vertical surfaces 27a, 28b of the claws 27, 28 are located apart.

In this second embodiment, unlike the first embodiment, the second sleeve 22 has convex key portions 32 and 33.
is not formed. Moreover, the groove portion 5 is not formed in the main body 1.

Then, the convex key portion 6 of the main body 1, the convex key portion 31 of the first sleeve 21, the groove portion 34 of the second sleeve 22, and the groove portion 42 of the support rod 41 rotate around the main body 1 and the sleeves 21, 22. A first rotation prevention means 51 that prevents rotation of the sleeves 21, 22 and the support rod 41, and a second rotation prevention means 52 that prevents rotation of the sleeves 21, 22 and the support rod 41.
is formed.

Then, when the support rod 41 moves up and down, the convex key portions 6 and 31 of the main body 1 and the first sleeve 21 slide in the groove portion 42 of the support rod 41.

Furthermore, when tightening the nut 11, as shown in FIG. Press. On the other hand, the first
As shown in FIG. 0, the second sleeve 22 presses the main body 1 in the clockwise direction via its groove 34 and the convex key portion 6 of the main body 1. Therefore,
The main body 1 presses the support rod 41 in the clockwise direction via its convex key portion 6 and the groove portion 42 of the support rod 41. Further, since the support rod 41 is pressed counterclockwise by the first sleeve 21 as described above, the main body 1 is pushed counterclockwise via the groove portion 42 and the convex key portion 6 of the main body 1. It will be pressed in the rotational direction. In this way,
Both sleeves 21 and 22 directly or indirectly,
By pressing the main body 1 and the support rod 41 in opposite directions in the circumferential direction, the main body 1 and the sleeves 21, 22 and the sleeves 21, 2
2 and the support rod 41 are securely and firmly fixed in the circumferential direction and are prevented from rotating.

That is, according to the configuration of the second embodiment, not only the sleeves 21 and 22 and the support rod 41 are included. Main body 1
The sleeves 21 and 22 can also be prevented from rotating more reliably.

In both of the above embodiments, the support rod 41 is moved up and down by the rack 43 and the pinion 15, but the vertical movement mechanism of the support rod 41 is not limited to the rack 43 and the pinion 15, and can be manually moved up and down. It may be something.

〔Effect of the invention〕

According to the present invention, the sleeve that is pressed in the axial direction by the pressing body to tighten the support rod in the radial direction is divided into two parts in the axial direction, and the contact surfaces of both sleeves are inclined with respect to the circumferential direction. The inclined surface is provided with a first rotation prevention means for preventing rotation of the main body and the sleeve, and the force applied to both sleeves in the circumferential direction and in mutually opposite directions as the pressing body is tightened causes the sleeve and the support rod to rotate. Since the second anti-rotation means is provided, the support rod can be tightened and the support rod can be moved against the main body provided with legs without impairing the slidability of the support rod with respect to the sleeve when the pressing member is loosened. When fixed in the axial direction, not only the main body and the sleeve are prevented from rotating, but also the sleeve and the support rod are prevented from rotating reliably and firmly, so that there is no play not only in the axial direction but also in the circumferential direction. can also be reliably prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main body showing a first embodiment of the tripod of the present invention, Fig. 2 is an exploded sectional view of the main body and sleeve of the same, Fig. 3 is a cross-sectional view of Fig. 1 of the above, and Fig. 4 1 is a schematic sectional view of FIG. 1 of the above, FIG. 5 is a schematic sectional view of FIG. 1 of the same, FIG. 6 is a side view of the entire same, and FIG. 8 is an exploded sectional view of the main body and sleeve, FIG. 9 is a schematic sectional view of FIG. 7, and FIG. 10 is a schematic sectional view of FIG. 7. DESCRIPTION OF SYMBOLS 1... Main body, 2... Leg, 3... Cylindrical part, 4... Receiving surface which is an inclined surface, 5... Groove part, 6... Convex key part, 11... Nut as a pressing body, 13... Inclined surface, 21... Sleeve, 22... Sleeve, 23... Inclined surface, 24... Inclined surface, 27b... Inclined surface, 28b... Inclined surface, 31...
Convex key part, 32...Convex key part, 33...Convex key part, 3
4... Groove, 41... Support rod, 42... Groove, 51... First
rotation prevention means, 52...second rotation prevention means.

Claims (1)

[Scope of Claims] 1. A cylindrical part is formed in a main body provided with three legs, and a pressing body is provided around the end of this cylindrical part so that it can move forward and backward in the axial direction and can be fixed at a predetermined position, A substantially cylindrical sleeve is housed in the cylindrical part, and the receiving surface formed on the inner surface of the cylindrical part and the pressing body are arranged at one end and the other end of the sleeve in the axial direction. and are brought into contact with each other from opposite directions, and the contact surface between the sleeve and at least one of the receiving surface and the pressing body is an inclined surface inclined in a direction in which the diameter decreases toward the tip of the sleeve, and the inclined surface portion of the sleeve is The tripod is movable in the radial direction and has a substantially cylindrical support rod inserted into the sleeve so as to be slidable in the axial direction. The contact surfaces facing in the axial direction are sloped surfaces inclined in a certain direction with respect to the circumferential direction, and a first rotation prevention means is provided for preventing rotation of the main body and the sleeve, and as the sleeve is tightened by the pressing body, A tripod characterized in that a second rotation preventing means is provided for preventing rotation of the sleeve and the support rod by a force applied to both the sleeves in a circumferential direction and in mutually opposite directions. 2. The first detent means includes a convex key portion and a groove portion formed on the inner surface of the cylindrical portion and the sleeve, respectively, and fitted into each other in a press-contact state,
The second detent means includes a convex key portion formed on each of the sleeves, and a convex key portion formed on the support rod of both sleeves, each of which is fitted in an axially slidable manner. 2. The tripod according to claim 1, further comprising a groove extending into the tripod. 3 The above-mentioned rotation prevention means includes a convex key portion formed on the inner surface of the cylindrical portion, a convex key portion formed on one sleeve, and a convex key portion of the cylindrical portion formed on the other sleeve. an axially extending groove formed in the support rod and in which the convex key part of the cylindrical part and the convex key part of the one sleeve are respectively fitted so as to be slidable in the axial direction; A tripod according to claim 1, characterized in that the tripod comprises: