JP3066518U - Lock mechanism for telescopic legs for tripods - Google Patents

Abstract

(57) [Summary] [Object] To provide a locking mechanism for a tripod telescopic leg that can extend and retract a leg with a simple structure and reliably maintain the extended posture when extended. A connecting structure in which a base leg member 1 and a second leg member 2 are inserted into and out of the base is referred to as a contraction lock mechanism A. A pair of through holes 23 are drilled near the upper end of the second pipe member 21,
A swelling circumferentially inclined punch 25 is fitted into the elastic leaf spring member 24 bent in a substantially U shape from the inner diameter side of the pipe. A pair of through holes 14 are drilled near the lower end of the base leg member 1, and when the telescopic leg is extended, the pipe member 21 is rotated in the circumferential direction so that the circumferential slanting punch 25 is attached to the base leg member. The first hole is prevented from dropping into the through-hole, and the circumferentially inclined punch 25 is further rotated to retreat from the through-hole to allow the insertion of the leg member. .

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a locking mechanism for a tripod telescopic leg that extends or contracts a plurality of pipe members having different diameters, such as a camera tripod, by sequentially inserting and removing the pipe members.

[0002]

[Prior art]

 Conventionally, as a tripod used for photography, etc., a tripod telescopic leg with a telescopic leg that expands or contracts the length of a leg by inserting or removing a plurality of pipe members with different cylinder diameters sequentially from the past has been used. I have. In particular, for small and lightweight ones, there is a structure in which the large-diameter pipe member overcomes the staple elastically urged outward from the small-diameter pipe member when extended, but it contracts when a relatively large load is applied. However, there is also a problem that the straddle gets over the stabbing and the stretched state cannot be stably maintained.

[0003]

[Problems to be solved by the invention]

 The present invention has been made in view of the above-mentioned problems, and has a novel structure in which a leg can be extended and contracted with a simple structure, and a telescopic leg lock for a tripod having a new structure that can reliably maintain the extended posture when extended. It is intended to provide a mechanism.

[0004]

[Means for Solving the Problems]

 That is, the locking mechanism for the tripod telescopic leg according to the present invention is a tripod telescopic leg for extending or contracting a leg length by inserting or extracting a plurality of pipe members having different diameters, such as a camera tripod, sequentially. In the above, the connecting structure in which the base leg member and the second leg member are inserted and inserted into and out from each other, a pair of through holes are drilled at a diameter position near the upper end of the second pipe member, and the second pipe member is bent in a substantially U shape. At the both ends of the elastic leaf spring material, the circumferentially inclined punches bulging outwardly from the respective elastic leaf spring materials are fitted from the inner diameter side of the pipe, and are elastically urged so as to project toward the outer diameter, respectively. A pair of through holes are drilled at a diameter position near the lower end of the base member at the base end. When the telescopic leg is extended, the second pipe member is rotated in the circumferential direction and the circumferential inclined stabbing is performed. Into the through hole of the base leg member to prevent insertion of the leg member. It is intended to subject matter that it has a structure that allows insertion of the leg member is retracted from further rotation by holes the circumferential direction inclined strokes tufts with.

In addition, a retaining outer peripheral strip is provided around the outer periphery of the upper end of the second leg member, and the retaining outer peripheral strip abuts on the inner periphery near the lower end of the base leg member. It is preferable to provide a retaining inner peripheral strip that is formed.

[0006]

[Embodiment of the invention]

 Hereinafter, an embodiment of a lock mechanism for a telescopic leg for a tripod according to the present invention will be described with reference to the drawings. The drawing shows a tripod telescopic leg in which the top end is pivotally pivoted at an angle in the outer diameter direction with respect to the base, and three telescopic legs are arranged at intervals of 120 degrees in the circumferential direction. A base leg member, one end of which is pivotally connected to the base, 2 is a second leg member, 3, 3,... Are middle leg members, and 4 is a distal leg member.

The base leg member 1 is screwed with a mount member 13 which is pivotally mounted on a pipe member 11 having a female screw 12 screwed on an upper end side so as to be swingable with respect to a base (not shown) of the tripod. A pair of through holes 14 and 14 are formed at the lower end of the opposed cylindrical wall located near the end at the lower end.

Further, at the upper and lower ends of the pipe member 11, decorative pipe rings 15, 15 are extrapolated and fixed to the outer periphery, respectively. At the lower end side, through holes 14, 14 are formed by the decorative pipe ring 15 from outside. It is hidden. Reference numeral 16 denotes a retaining inner circumferential strip that is provided slightly above the through hole 14 of the pipe member 11 and slightly protrudes toward the inner circumferential side of the cylindrical wall.

The second leg member 2 constitutes a contraction locking mechanism A on the upper end side of a pipe member 21 inserted into the pipe member 11 of the base leg member 1 at the upper end. The inner peripheral rib 16 of the pipe member 11 constituting the base end leg member 1 is formed with two retaining outer peripheral ribs 22, 22 which abut against the sliding in the axial direction.

The contraction lock mechanism A has a pair of through-holes 23 formed at a position slightly below the diameter of the retaining outer circumferential strips 22 of the pipe member 21 and is bent in a substantially U-shape. Circumferentially inclined punches 25, 25 are formed at both ends of the elastic leaf spring material 24 and bulge out of the outer sides thereof, and the circumferentially inclined punches 25, 25 are fitted from the inner diameter side of the pipe member 21. Then, they are elastically biased so as to protrude toward the outer diameter.

The circumferential slanting punch 25 forms a slant surface 26 that recedes from the radial direction in the circumferential direction, and a locking surface 27 whose upper and lower side surfaces are substantially perpendicular to the side wall cut surface of the pipe member 21. When inserted into the through-hole 14, the upper and lower cutting edges of the through-hole 14 abut against the locking surface 27 with respect to the axial sliding displacement. Acts to prevent.

Further, with respect to the rotational displacement in the direction of arrow C, the cutting edge of the through hole 14 in the circumferential direction interferes with the inclined surface 26 and acts to push the circumferentially inclined punch 25 in the inner diameter direction. Release the second leg member 2 and allow the pipe member 21 to be inserted and stored in the pipe member 11 of the proximal leg member 1. Reference numeral 28 denotes a storage-side stop staple located slightly below the through-hole 23 of the pipe member 21 and protruding inward.

The intermediate leg member 3 includes a pipe member 31 inserted into the pipe member 21 of the second leg member 2 and a pipe constituting the next intermediate leg member 3 inserted into the pipe member 31. A plurality of members 31 are connected, and an insertion locking mechanism B is formed on the upper end side of the pipe member 31.

[0014] Two retaining outer peripheral strips which are located at the upper end of the pipe member 31 and which come into contact with the retaining inner peripheral strip 29 of the pipe member 21 constituting the second leg member 2 in the axial direction. 32, 32 are formed.

The insertion and locking mechanism B has a pair of through holes 33, 33 formed at a position slightly below the diameter of the retaining outer circumferential strips 32, 32 of the pipe member 31 and is bent substantially in a U-shape. The hemispherical head punches 35 and 35 are formed at the both ends of the elastic leaf spring material 34, and bulge out of the respective elastic leaf spring members 34. They are fitted from the inner diameter side and elastically urged to project toward the outer diameter.

The hemispherical head punch 35 has a base portion formed into a short cylindrical shaft portion 36 which is substantially perpendicular to the side wall cut surface of the pipe member 31, and has a top end having a hemispherical surface 37. When the pipe member 31 is inserted, the edge of the outer pipe member and the cylindrical shaft portion 36 interfere with each other, and the edge of the two outer pipe members and the hemispheric surface 37 interfere with each other. Structure.

That is, when the pipe member is to be accommodated in the outer pipe member in the extended state, the end of the pipe member and the cylindrical shaft portion 36 abut against each other to prevent contraction. However, when the outer pipe member is already stored and the outer edges of the two outer pipe members are located outside the edges of the outer pipe member, the two outer pipe members are located outside the outer edge of the outer pipe member. The edge of the pipe member interferes with the hemispherical surface 37 and pushes the hemispherical punch 35 in the inner diameter direction, so that the position of the hemispherical surface 37 is displaced to the outer edge position of the outer pipe member.

Due to this displacement, the outer edge of the outer pipe member interferes with the hemispheric surface 37 and acts to push the hemispherical punch 35 in the inner diameter direction, thereby allowing the pipe member 31 to be inserted. . Reference numeral 38 denotes a storage-side stop staple located slightly below the through hole 23 of the pipe member 21 and protruding inward.

The distal leg members 4 each constitute an insertion locking mechanism B on the upper end side of a pipe member 41 inserted into the pipe member 31 of the intermediate leg member 3. An inner retaining strip 39 is formed at the upper end of the pipe member 41 and constitutes the intermediate leg member 3. .

The insertion and locking mechanism B has a through hole 43 slightly below the retaining outer circumferential strip 42 of the pipe member 41 and one end of an elastic leaf spring material 44 bent substantially in a U-shape. The hemispherical head striking 45 is bulged out on the outer side, and the hemispherical head striking 45 is fitted from the inner diameter side of the pipe member 41 and protrudes toward the outer diameter. It is elastically biased as described above.

The base portion of the hemispherical head punch 45 is a short cylindrical shaft portion that is substantially perpendicular to the cut surface of the side wall of the pipe member 41, and the top end is a hemispherical surface. When the pipe member 41 is inserted, the edge of the one outer pipe member and the cylindrical shaft portion and the edge of the two outer pipe members are formed when the pipe member 41 is inserted. And the hemisphere interfere. Reference numeral 46 denotes a stone butt fitted and fixed to the lower end of the pipe member 41.

[0022]

[Effect of the invention]

 As described above, the locking mechanism of the tripod telescopic leg according to the present invention locks the second leg member inserted into the base leg member only by rotating the second leg member in the extended position in the circumferential direction as described above. Or, it has a structure that repeats the release action, and the middle leg member simply stretches the leg member by stretching it in the direction of the leg, compresses and stores it, making the extension and storage operation of the tripod extremely easy, and also the configuration Can be provided at a low cost because of its simplicity. In addition, it has excellent features such as a structure that hardly appears on the exterior and a simple design can be obtained, and the effect after the implementation of the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a lock mechanism for a tripod telescopic leg according to the present invention, wherein FIG. 1 (a) is a front sectional view of a partially cut-out telescopic leg, and FIG. is there.

FIG. 2 is an exploded perspective view of a contraction lock mechanism.

FIG. 3 is an explanatory diagram showing a relationship between an insertion locking mechanism and a pipe diameter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base leg member 11 Pipe member 13 Mounting member 14 Through-hole 15 Decorative pipe ring 16 Inner peripheral line of retaining 2 Second leg member 21 Pipe member 22 Outer peripheral member of retaining 23 Through-hole 24 Elastic leaf spring material 25 Circumferential direction Inclined hammer 26 Inclined surface 27 Engagement surface 28 Storage side stop hammer A Shrink lock mechanism B Insertion lock mechanism

Claims (2)

[Utility model registration claims] 1. A tripod telescopic leg for extending or contracting a plurality of pipe members having different diameters, such as a camera tripod, by sequentially interpolating them, wherein a base leg member and a second leg member are provided. A connecting structure in which the leg members are inserted and removed is provided with a pair of through holes at a diameter position near the upper end of the second pipe member, and is located at both ends of the elastic leaf spring material bent substantially in a U shape. Each of the circumferentially inclined stabbing bulges outwardly from the inner side of the pipe is fitted from the inner diameter side of the pipe, and elastically urges so as to protrude toward the outer diameter, respectively. When the telescopic leg is extended, the second pipe member is rotated in the circumferential direction to drop the circumferentially inclined punch into the through hole of the base leg member. While preventing the insertion of the member, it is further rotated to open the circumferentially inclined punch through the hole. Tripod telescopic legs of the locking mechanism, characterized in that the structure to allow insertion of the leg member with al retracted. 2. A stopper outer circumferential strip is provided around the outer periphery of an upper end of a second leg member, and the stopper outer peripheral strip abuts on an inner periphery near a lower end of a base leg member. 2. The locking mechanism for a telescopic leg for a tripod according to claim 1, wherein a retaining inner circumferential strip is provided around the retaining leg.