JPH11193804A - Locking device for telescopic mast - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device for a telescopic mast which can simplily be temporarily locked at the time of the adjustment of the length and can sure be locked after the adjustment to a desired length. SOLUTION: This locking device is provided with a lever-type locking mechanism, by which a first locking member is pressed against an internal, cylindrical body 3 by means of a lever 14, which is energized by a spring 15 to a holder 11 installed in an external, cylindrical body 2, a screw-type locking mechanism, which is formed in such a way that a second locking member can be pressed against the internal, cylindrical body 3 by means of a pushing member 16 that is advanced (through screw action) by turning a handle 16b, and a level with a bubble tube 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for securing an extensible mast, and more particularly, to an extensible mast configured to move two mast members relative to each other in the longitudinal direction so as to change the overall length of the mast. The present invention relates to a fixing device for restricting relative movement of members and fixing the entire length of a mast to a desired length.

[0002]

2. Description of the Related Art A telescopic mast (also referred to as a kinematic pole) using a prism or antenna attached to the tip.
Is configured so that the outer cylinder and the inner cylinder can move relative to each other to change the overall length of the mast, and is provided with a fixing device for fixing the two cylinders to their positions after adjusting to the desired overall length of the mast. General. As an example of the fixing device, a structure in which when a knob attached to the outer cylinder side is turned, the screw rod is screwed forward, and the tip of the screw rod presses the inner cylinder body so that both cylinder bodies cannot move relative to each other. When the outer cylinder and the inner cylinder are rotated to twist, the contact member provided inside the cylinder presses both cylinders by the action of the eccentric cam, so that both cylinders can move relative to each other. There is a configuration that disappears.

[0003]

In the above-mentioned conventional telescopic mast, when the mast is set to a desired height, the operation of turning the knob or twisting both the cylinders is unexpectedly troublesome.
Operation may take time. In addition, it is possible to adopt a one-touch simple fixing device with emphasis on operability, but then there is a risk that both cylinders will move relative to each other by careless operation, Lack of certainty.

[0004] It is an object of the present invention to provide a fixing device for a telescopic mast which can be easily temporarily fixed at the time of length adjustment, and which can be securely locked after adjusting to a desired length. .

[0005]

Means for Solving the Problems To achieve this object, the following expansion mast securing device was created. That is, the first invention is a telescopic mast configured so that the two mast members can be moved relative to each other in the longitudinal direction to change the overall length of the mast, and one of the mast members is provided with a stop member by operating a lever. A lever-type lock mechanism capable of restricting the relative movement of the two mast members by pressing against the other mast member, and pressing the stop member against the other mast member by screwing the pressing member so that the relative position between the two mast members is reduced. A screw-type lock mechanism capable of restricting movement.

In the above fixing device, when adjusting the length of the telescopic mast, the mast members can be temporarily fixed by operating the lever of the lock mechanism, and after the length adjustment is completed, the pushing member of the lock mechanism is screwed. By operation, both mast members can be securely locked.

According to a second aspect of the present invention, in the above-mentioned fixing device for the telescopic mast, the lever of the lever-type lock mechanism is biased by a spring so as to press the stop member against the other mast member. It is characterized by being.

In the above fixing device, when the lever is operated against the spring force of the spring, the two mast members become relatively movable, and when the operating force is loosened, the mast member automatically returns to the locked state. Therefore, the mast member can be easily and quickly set to a required length.

According to a third aspect of the present invention, in the above-mentioned fixing device for the telescopic mast, the lever type locking mechanism, the screw type locking mechanism, and the holder attached to the upper end of the one mast member are provided. And a level is provided.

[0010] In the above fixing device, when adjusting the length of the telescopic mast, the operator can operate the lever while looking at the level at hand, so that the work of vertically setting the telescopic mast is easy. Become. By providing the lever-type lock mechanism, the screw-type lock mechanism, and the level in one holder, the beauty of the telescopic mast can be improved, and the manufacturing cost can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view of the telescopic mast, FIG. 2 is a longitudinal sectional view showing a main part of the telescopic mast, and FIG.
It is a line sectional view. As shown in FIG. 1 to FIG. 3, the telescopic mast 1 is configured to use the inner cylinder 3 inserted into the outer cylinder 2 by extending it to a desired length. A fixing device 10 (to be described in detail later) for regulating and fixing the entire length of the mast to a desired length is provided. In addition,
The outer cylinder 2 and the inner cylinder 3 are the mast members in the present invention.

The outer cylinder 2 is made of, for example, an aluminum pipe having a length of about 1 m, and has a butt 2a attached to a lower end thereof. , A resin sleeve 4 for guiding the inner cylindrical body 3 is fitted on the inner peripheral side. further,
A retainer 5 that protects the outer cylinder 2 and prevents the sleeve 4 from coming off is bonded to the upper end of the outer cylinder 2. The holder 11 is fixed to the outer cylinder 2 with a set screw 11a.

The inner cylinder 3 is an aluminum pipe having an outer diameter substantially equal to the inner diameter of the outer cylinder 2. A flat graduation surface 3a extending in the axial direction is formed on the outer peripheral surface, while the sleeve 4
A guide surface 4a to which the scale surface 3a can slide is formed on the inner surface of the inner cylinder 3. The inner cylinder 3 inserted into the outer cylinder 2 can slide in the axial direction but cannot rotate around the axis. ing. A lower end of the inner cylinder 3 is provided with an anti-sway member 6 having an outer diameter substantially equal to the inner diameter of the outer cylinder 2, and an upper end is provided with a mounting seat 7 and a mounting screw for mounting a prism or an antenna. 7a is provided.

Next, the securing device 10 will be described. As shown in FIGS. 2 and 3, holes 2 formed in the outer cylinder 2 are formed.
The positions of the holes 4b and 4c formed in the sleeve 4 coincide with the positions of the holes 4b and 2c.
The stopper member 12 and the second stopper member 13 are mounted so that they can enter and exit in a direction perpendicular to the axis of the outer cylinder 2. The first stopper member 12 has a contact portion 12 a capable of contacting the outer peripheral surface of the inner cylindrical body 3.
And the rear surface 12b is arranged to be pushed by the working end 14a of the lever 14. The lever 14 has a grip 14 b extending substantially along the outer cylinder 2, and
The support shaft 11b provided on the support member 1 is rotatably supported around an axis extending in a direction perpendicular to the axis of the outer cylinder 2. Then, the spring 15 mounted between the grip portion 14b and the outer peripheral surface of the outer cylinder 2 urges the grip portion 14b in a direction of flipping it up, that is, a direction in which the first stopper member 12 is constantly pressed against the inner cylinder 3. doing. The lever type lock mechanism is configured as described above.

The second stopper member 13 has a contact portion 13a that can contact the outer peripheral surface of the inner cylinder 3, and the rear surface 13b is arranged to be pushed by the pushing member 16. This push member 1
The shaft portion 16a has an external thread portion screwed into the female thread portion 11c of the holder 11, and when the knob 16b is turned, the pushing member 16 is screwed and the second stopper member 13 is moved inside the shaft end. Cylinder 3
It is formed so as to press against. 16c in the figure is
This is a retaining ring for preventing the pushing member 16 from falling off.
The screw lock mechanism is configured as described above.

A bubble tube mounting portion 11d is formed on the holder 11 at a position opposite to the pressing member mounting side, and a level bubble tube 17 fitted in the bubble tube mounting portion 11d has a support ball 18 at the bottom center. It is tiltably supported, and the inclination of the bubble tube 17 can be adjusted with three adjusting screws 19. When the outer cylinder 2 stands vertically, the bubble tube 1
7 is set so that the pointing surface (upper surface) is horizontal.
The holder 11 incorporates the level, the lever-type lock mechanism, and the screw-type lock mechanism configured as described above.
Accordingly, the securing device having the two systems of locking mechanisms has a compact design with a sense of unity, improves the aesthetics of the telescopic mast, and can reduce the manufacturing cost.

Next, the operation of the telescopic mast 1 configured as described above will be described. Telescopic mast 1 before use,
The operator has to turn the knob 16b to confirm that the pushing member 16 is in the retracted position (see FIG. 4) because the contracted state is set for ease of handling. Thereafter, when the grip portion 14b of the lever 14 and the outer cylinder 2 are gripped with one hand, the lever 14 rotates in a direction to contract the spring 15 and the pressing force of the working end portion 14a against the first stopper member 12 is released. Is done. Since the pressing force of the pressing member 16 has not been applied to the second stopper member 13, the outer cylinder 2 and the inner cylinder 3 are in a free state in which the outer cylinder 2 and the inner cylinder 3 can slide relative to each other, as shown in FIG.

Subsequently, while the lever 14 is kept down, the inner cylinder 3 is extended using the other hand, and when the desired length is reached, the hand holding the grip portion 14b is loosened. Then, the lever 14 is rotated by the spring force of the spring 15, the working end 14 a presses the first stopper member 12 against the outer peripheral surface of the inner cylinder 3, and the inner cylinder 3 is temporarily stopped in a non-slidable state. The above adjustment work is repeated as necessary. Fine adjustment is often performed with the telescopic mast 1 standing at a predetermined position, but it is convenient because the level can be viewed while holding the grip 14b of the lever 14. When the position of the telescoping mast 1 and the set height are determined, the knob 16b is turned to make the pushing member 16 advance, and the second stopper member 13 is pressed against the outer peripheral surface of the inner cylindrical body 3 at the tip of the shaft portion 16a (FIG. 2). reference). Thus, the inner cylinder 3 is securely locked. At this time, the outer cylinder 2 and the inner cylinder 3 are doubly locked so that they cannot move relative to each other, so that the reliability is increased.

By the way, in the above-mentioned telescopic mast 1, the first
The stop member 12 and the second stop member 13 are configured to be separated from and brought into contact with the inner cylindrical body 3 individually.
It is also possible to constitute so that it can be operated with 4 and the pushing member 16. The first and second stopper members 12, 13 are
Although the curved contact surface is configured to be pressed against the outer peripheral surface of the inner cylinder 3, irregularities that can be engaged with each other may be formed on the stopper member and the inner cylinder 3.

It should be noted that the present invention can of course be practiced in various modified forms based on the knowledge of those skilled in the art, in addition to the above-described embodiments.

[0021]

The telescopic mast securing device of the present invention can easily temporarily fix the mast member when the length is adjusted by moving the mast member relative to each other, and can securely lock after adjusting the length to the desired length. Therefore, there is an effect that both the operability and the reliability are improved. In addition, a device equipped with a level not only has good usability, but also can have a neat and beautiful design.

[Brief description of the drawings]

FIG. 1 is a perspective view of a telescopic mast according to an embodiment.

FIG. 2 is a longitudinal sectional view showing a main part of the telescopic mast.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a longitudinal sectional view of the telescopic mast, showing a state in which the lever is operated to be able to expand and contract.

[Description of Signs] 1 Telescopic mast 2 Outer cylinder 3 Inner cylinder 4 Sleeve 10 Fixing device 11 Holder 12 First stop member 13 Second stop member 14 Lever 15 Spring 16 Push member 16b Knob 17 Bubble tube

Claims (3)

[Claims] A telescopic mast configured to move two mast members relatively in a longitudinal direction so as to be able to change the entire length of the mast, wherein one of the mast members is provided with a stop member by operating a lever, and a stop member of the other mast member. A lever-type lock mechanism that can regulate the relative movement of the two mast members by pressing against the member, and restricts the relative movement of the two mast members by pressing the stop member against the other mast member by screwing the pushing member. A telescopic mast securing device comprising a possible screw-type locking mechanism. 2. The telescopic mast securing device according to claim 1, wherein the lever of the lever-type lock mechanism is spring-biased so as to press the stop member against the other mast member. Mast securing device. 3. The fixing device for a telescopic mast according to claim 1, wherein the lever type locking mechanism, the screw type locking mechanism, and a holder attached to an upper end of the one mast member are provided. Fixing device for telescopic masts with a level.