JPH0112079Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is designed to prevent the constituent pipe bodies from sliding in the direction of contraction when a multi-stage telescoping pipe used for tripods, walking sticks, etc. is stretched. This relates to a locking mechanism that locks the device.

(Prior art) Multi-stage telescopic pipes can be used as handles for various tools such as tripods for cameras and various measuring instruments, sticks, travel carriers, etc.
Although many other types of locking devices have been used, conventional locking devices between each pipe when the pipes are stretched are friction type, screw lock type, press screw type, manual lock type, etc., depending on the purpose of use. Various methods are commonly used.

(Problems to be solved by the invention) However, the above friction type is not suitable for applications with large loads in the axial direction, and the screw lock type,
The push-screw type has a complicated structure, high cost, and is troublesome to operate, so it cannot be used in applications that require quick operations. Operation is cumbersome, as you have to press the dowel pin with your fingertip.

(Means for Solving the Problems) In view of the above points, the present invention has a simple structure and can be manufactured at low cost, and also automatically locks the joints of each pipe body when stretched. To release the lock, simply push in the lock pin on the pipe body with the smallest diameter, and then push in the pipe bodies from the second stage onwards, and the locks at each joint will be automatically released.A multi-stage telescopic pipe. The purpose of this invention is to provide a locking mechanism for

In order to achieve the above-mentioned object, the present invention provides a locking mechanism for a multistage telescopic pipe in which at least three or more pipe bodies of different diameters are sequentially inserted and the connecting portions of these pipe bodies are locked in the stretched state. The rear ends of the pipe bodies other than the largest diameter pipe body are narrowed down to smaller diameters than the pipe body itself, and pin holes are drilled at predetermined positions on the circumference of the pipe bodies near the rear ends of the small diameter pipe bodies. In addition, in the rear part of the pipe body including the pin hole, a fishmouth-shaped leaf spring with the upper side of the S-shape elongated and a restriction block that restricts escape due to the deflection of this leaf spring are installed, and the above-mentioned The upper end of the leaf spring is located at the rear end of the pipe body, and the lower end thereof is located at the front end of the pipe body, and the upper and lower ends are in contact with the inner surface of the pipe body. , and with the upper side blocking the pin hole,
The end of the upper side is fixed to the inner surface of the rear part of the pipe body, and on the upper side surface of the position corresponding to the pin hole, there is a plate spring continuation from the upper side and facing the front end of the pipe body. The curved portion of No. 1 is pushed by the rear end of the intruded pipe body, and when the upper side bends in the radial direction of the pipe body using the above fixed point as a fulcrum, it separates from the pin hole, while the previous pipe body When the pin hole is opened as the pressure is released by being pulled out, the knock pin protruding from the pin hole is fixed by the elasticity of the upper side of the leaf spring, and the regulating block has an upper portion that prevents the bending movement of the upper side of the leaf spring. A groove is formed that does not interfere with the front surface.
It is characterized in that it is fitted into the rear part of the pipe body so as to come into contact with the second curved part of the leaf spring that is continuous from the first curved part and faces the rear end of the pipe body. be.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail based on the attached drawings.

FIG. 1 is a sectional view of a multi-stage telescopic pipe according to an embodiment of the present invention, and this pipe has a three-stage configuration. In the figure, P1 is the first stage pipe body located on the tip side, P2 is the second stage pipe body located in the middle, and P3 is the third stage pipe body located on the base end side. Among these pipe bodies P1 to P3, except for the pipe body P3 with the maximum diameter D3 in which other pipe bodies are finally housed, the first and second stage pipe bodies P1 and P2 are The rear end portion, which is the side, is formed into a tapered shape so that it has a smaller diameter than its own diameters D1 and D2.

H1 and H2 are pin holes drilled at predetermined positions on the circumferential surfaces of the first and second stage pipe bodies P1 and P2, respectively, close to the rear end portions.

S1 and S2 are leaf springs attached to the rear parts of the first and second stage pipe bodies P1 and P2, including the pin holes H1 and H2, and G1 and G2 are the deflection deformations of these leaf springs S1 and S2. In order to effectively carry out
This is a regulating block inserted between the leaf springs S1, S2 and the rear ends of the pipe bodies P1, P2. Since the leaf springs S1, S2 and the regulating blocks G1, G2 in both pipe bodies P1, P2 have the same structure, the second stage pipe body P will be described below.
The items in 2 will be explained in detail.

The leaf spring S2 is formed in the shape of a fish mouse with the upper side of the S-shaped elongated.The upper side end is connected to the rear end of the pipe body P2, and the lower side end is connected to the pipe body P2. P2 are respectively located on the front end side, and the upper and lower sides are connected to the pipe main body P.
The end of the upper side is fixed to the inner surface of the rear part of the pipe main body so that the upper side closes the pin hole H2. Therefore, this leaf spring S2 has an upper side portion and a first curved portion that is curved so as to protrude from this side toward the front end side of the pipe body P2, and the upper side portion and the first curved portion that is curved so as to protrude from the upper side portion toward the front end side of the pipe body P2. It is possible to bend and deform.

A knock pin N2 is fixed to the upper side surface corresponding to the pin hole H2. This knock pin N2 sinks from the pin hole H2 due to the above-mentioned bending deformation of the leaf spring S2, and the pipe body P2 is pulled out from the third stage pipe body P3, the pin hole H2 is opened, and the leaf spring S2 is inserted into the pin hole H2. When the upper side portion etc. elastically returns to its original position, it protrudes from the pin hole H2.

The regulating block G2 has a substantially cylindrical shape with an outer diameter approximately equal to the inner diameter of the pipe main body P2, and has a groove g in its upper part that does not interfere with the bending motion of the upper side of the leaf spring.
2 is formed. The regulating block G2 is arranged such that its front surface is in contact with the second curved part of the leaf spring S2 which is continuous from the first curved part and faces the rear end side of the pipe body P2. It is inserted into the rear. Therefore, the regulating block G2 prevents the portion from the second curved portion to the lower side portion from shifting toward the rear end side of the pipe body P2 during the above-mentioned bending operation of the leaf spring S2. To effectively perform bending deformation.

In addition, if the multi-stage pipe has a four-stage structure, a pin hole H3 is also drilled in the pipe body P3 of the third stage in the figure, and a leaf spring and a regulating block having the same structure as described above are fixed in a predetermined position. All you have to do is do it.

Next, the operation of the locking mechanism of the multistage telescopic pipe having the above structure will be explained.

First, assuming that this pipe is in a stretched state, the knock pin N1 of the first stage pipe body P1 is
When the pipe main body P1 is pushed into the second stage pipe main body P2 by pushing it by hand into the pin hole H1, the rear end of the first stage pipe main body P1 forms a taper with a small diameter. Because it is formed in a shape, this part is the leaf spring S in the second stage pipe body P2.
2 in the radial direction of the pipe to bend the leaf spring S2 in the same direction. As a result, the knock pin N2 fixed to the upper side of the leaf spring sinks through the pin hole H2, and the lock at the joint between the second stage pipe main body P2 and the third stage pipe main body P3 is automatically released. Since the second curved portion of the leaf spring S2 is fixed by the regulation block G2, the pressing force from the rear end of the first stage pipe main body P1 allows the leaf spring S2 to move from the upper side to the first curved portion. This part ensures the bending deformation necessary to sink the dowel pin N2.

During stretching, when the pipe bodies P1 and P2 housed in the third stage pipe body P3 are sequentially pulled out, the pin holes H1 and H2 are opened and at the same time, the plate springs S1 and S2 by the rear end of the pipe body of the previous stage are opened. When the pressing force is released, the knock pins N1 and N2 protrude from the pin holes H1 and H2 due to the elastic force of the leaf springs S1 and S2, and are locked to the front end of the pipe body in the latter stage, causing the pipe body to contract. Movement in this direction is restricted and locked.

Although the mechanism for preventing each pipe body from coming off in the stretched state is not shown in the drawings, a commonly known means is employed.

(Effects) As described above, according to the present invention, during stretching, by pulling and sliding the inner and outer pipe bodies of each stage relative to each other, the pin holes in the inner pipe body are opened. Due to the elasticity of the leaf spring attached to the rear of the inner pipe body, the knock pin protrudes from the pin hole and is locked to the front end of the outer pipe body, so this type of pipe is automatically locked in the direction of compression. can be accomplished.

Also, when storing, push in the dowel pin on the first stage pipe body, then push the first stage pipe body into the second stage pipe body, and then push the second stage pipe body into the third stage pipe body. The rear end of the pipe body in the previous stage presses the first curved part of the leaf spring of the pipe body in the next stage in the pipe radial direction, and the upper part of the leaf spring to which the knock pin is fixed is similarly bent in the radial direction. Since the lock pin is inserted into the pipe through the pin hole, the lock described above can be automatically released. In addition, since the regulating block is in contact with the second curved part of the leaf spring, when the rear end of the pipe body presses the leaf spring, the part from the second curved part to the lower side of the pipe body It does not shift toward the rear end, and the upper side can be effectively bent and deformed.

In addition, with the present invention, it is only necessary to drill a pin hole in each pipe body, narrow the rear end of the pipe body to a small diameter, and arrange a leaf spring of a predetermined shape and a regulating block inside the pin hole. This type of pipe can be manufactured easily and inexpensively.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts showing an embodiment of the multi-stage telescopic pipe according to the present invention, and FIG. 2 is a cross-sectional view taken along A-A in FIG.
The sectional view, FIG. 3, is a sectional view taken along the line B--B in FIG. 1. P1, P2, P3...Pipe body, H1, H2
...Pin hole, G1, G2...Guide block, N
1, N2... Knock pin, S1, S2... Leaf spring.

Claims (1)

[Scope of Claim for Utility Model Registration] In a locking mechanism for a multi-stage telescopic pipe in which at least three or more pipe bodies of different diameters are sequentially inserted and the joints of these pipe bodies are locked in the stretched state, the pipe with the largest diameter The rear end of the pipe body other than the main body is narrowed down to a smaller diameter than the pipe itself, and a pin hole is drilled at a predetermined position on the circumference of the pipe body near the rear end of this small diameter, and the above-mentioned Inside the rear part of the pipe body including the pin hole,
A fishmouth-shaped leaf spring with a long upper side and a restriction block that restricts escape caused by the deflection of this leaf spring are attached. On the rear end side, the ends on the lower side side are respectively located on the front end side of the pipe body, the upper side and the lower side are in contact with the inner surface of the pipe body, and the upper side closes the pin hole, The end of the upper side is fixed to the inner surface of the rear part of the pipe body, and on the upper side surface of the position corresponding to the pin hole, there is a plate spring continuation from the upper side and facing the front end of the pipe body. The curved portion of No. 1 is pushed by the rear end of the preceding pipe body that has entered, and when the upper side bends in the radial direction of the pipe body using the above fixed point as a fulcrum, it separates from the pin hole, while the previous pipe body When the pin hole is opened by being pulled out and the pressure is released and the pin hole is opened, the knock pin protruding from the pin hole is fixed by the elasticity of the upper side of the leaf spring, and the regulating block has an upper part that is adapted to the bending movement of the upper side of the leaf spring. A groove is formed so as not to interfere with the rear part of the pipe body, and the front surface is in contact with a second curved part of the leaf spring that is continuous from the first curved part and faces the rear end of the pipe body. A locking mechanism for a multi-stage telescopic pipe that is inserted into the interior.