JPS6316086Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a collapsible support mainly used for projectors and the like.

[Conventional technology]

This type of collapsible support is too tall when not in use or when being transported, so it is constructed so that the main rod can be folded down. FIG. 3 shows an example of a collapsible support when used in a projector.

The collapsible support column 51 is provided together with a generator 54 on a base 53 that is moved by casters 52. The collapsible column 51 is constructed by attaching a main rod 6 to a bifurcated support rod 5 that is vertically disposed on a base 53. The main rod 6 includes a storage rod 7 and lifting rods 8 and 9 housed within the storage rod 7. The lifting rod 8 is the storage rod 7.
The lifting rod 9 is further installed inside the lifting rod 8, and the lifting rod 9 is housed inside the storage rod 7 or the lifting rod 8, respectively.
The interior is designed so that it can appear and retract from the upper end. A mounting shaft 23 is provided on the outer peripheral surface of the central portion of the storage rod 7, and this mounting shaft 23 is rotatably supported between the upper ends of the bifurcated support rods 5.

As shown in FIG. 4, the lifting rods 8 and 9 are equipped with pulleys 10, 11 and 12, 13, respectively. Each lifting rod 8,
It is attached across the 9th frame wall. One end of the wire rope 16 is locked to a locking portion 24 below the mounting position of the pulley 12 on the lifting rod 8, and is then guided in the order of the pulley 12, the pulley 13, the pulley 10, and the pulley 11, and then the storage rod 7. After being guided by a pulley 17 attached to the upper inner wall of the storage rod 7, it is guided outside the storage rod 7 by a pulley 18 installed at the lower end of the storage rod 7, and further guided by a pulley 19 fixed to the support rod 5 below the storage rod 7. The other end is locked to a winch 20 attached above the support rod 5. still,
21 is a storage rod receiver fixedly connected to the support rod 5; 22;
is an illumination light installed at the top of the lifting rod 9.

With the above-mentioned configuration, when the lifting rods 8 and 9 are vertically raised, by unwinding the wire rope 16 using the winch 20 attached to the supporting rod 5, the lifting rods 8 and 9 can be moved as shown in FIGS. By changing the distance between the pulleys 17 and 11 and between the pulleys 10 and 13, the length of the storage rod 7 protruding from the upper end can be adjusted. Also, the wire rope 16 is reeled back, the lifting rods 8 and 9 are lowered to the lowest position, and the wire rope 1 is further lowered slightly.
After rewinding the wire rope 16 to give slack to the wire rope 16, the main rod 6 (that is, the storage rod 7) is tilted by the amount of slack in the wire rope 16, and the wire rope 1
When the main rod 6 is unwound, the main rod 6 rotates forward about the mounting shaft 23, which is the connection part with the support rod 5, until the main rod 6 becomes approximately horizontal as shown by the two-dot chain line in FIG. In this state, it comes into contact with the storage rod receiving part 21 and becomes stable.

[Problem that the invention attempts to solve]

The conventional collapsible columns as described above have the following drawbacks. That is, in the above-mentioned collapsible support, when tilting the main rod 6 after lowering the lifting rods 8 and 9, the main rod 6 must be applied with an external force in order to give a horizontal vector to the main rod 6. wire rope 16
It is necessary to tilt it by the amount of slack. However, if the slack in the wire rope 16 is too large, the main rod 6 may tilt violently and greatly, posing a danger to the worker, and the device itself may be subjected to impact, reducing its lifespan. It is.

[Means for solving problems]

The present invention was developed in view of the above circumstances, and provides a collapsible support that is equipped with a safety device that prevents the main rod from tilting even if external force is applied when the wire rope is slack to a certain extent. with the aim of
In a collapsible support column in which the central part of the main rod is rotatably attached to the support rod, and the main rod can be tilted or raised by unwinding the wire rope, if the wire rope is slack beyond a certain level, The gist of the collapsible support is that the support rod is provided with a safety device whose one end engages with the main rod and is pressed by the wire rope to release the engagement when the wire rope is tensed. There is.

[Effect]

The collapsible column according to the present invention is equipped with a safety device on the support column, and this safety device engages with the main column when the wire rope slackens beyond a certain level, and is pressed by the wire rope when the wire rope is tensed to a certain extent. The engagement is released so that the main rod does not begin to tilt when the wire rope is excessively slack.

〔Example〕

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

Reference numeral 1 denotes a collapsible column, and among the members constituting the collapsible column 1, the same reference numerals are given to the members corresponding to the conventional collapsible column 51 shown in FIG.
Moreover, the explanation thereof will be omitted.

31 is a safety device whose center portion 31a is rotatably attached to the inside of one of the bifurcated support rods 5;
An engaging portion 33 that engages with an engaging piece 32 provided on the storage rod 7 when the safety device 31 rotates is formed on one end of the safety device 31, and a wire rope is provided on the other end. A wire rope receiver 34 is provided which can come into contact with the wire rope 16 between the pulley 19 and the winch 20 when the wire rope 16 is tensioned. The wire rope receiver 34 is provided in a closed loop shape,
A wire rope 16 passes through the closed loop, and a roller 36 is fitted onto a receiving bar 35 with which the wire rope 16 comes into contact. This safety device 31 is formed so that the wire rope receiver 34 side is heavier than the engaging portion 33 side, and therefore, the safety device 31 always has the wire rope receiver 34 positioned downward (arrow A side in Fig. 2). A force is acting that rotates it in the direction of the object. Further, the rotation angle is limited by a stopper piece 37 or the like so that the wire rope receiver 34 side is maintained above the engaging portion 33.

A compression spring 38 is attached to a mounting plate 39 that is integrated with the support rod 5, and biases the main rod 6 in the tilting direction. When raising and lowering the lifting rods 8 and 9, the storage rod 7 is fixed to the support rod 5 in an upright position, and the main rod 6 is tilted with the lifting rods 8 and 9 stored in the storage rod 7. Sometimes it is a locking device that can fix the lifting rods 8, 9 with the storage rod 7.

The collapsible support strut configured as described above operates as follows. That is, when the lifting rods 8 and 9 are lowered, the wire rope 16 is unwound too much and the second
The wire rope 16 as shown by the dashed line in FIG.
If the wire rope 16 is slack, the wire rope 16 does not press the receiving bar 35 of the wire rope receiver 34, so the safety device 31 rotates in the direction of arrow A, and the engaging portion 33 engages the engaging piece of the main rod 6. 32. Therefore,
The main rod 6 cannot be tilted even if the support rod 5 and the main rod 6 are unlocked by the locking device 40. Therefore, when the wire rope 16 is tensed as shown by the solid line in FIG.
contacts the roller 36 fitted onto the receiving bar 35 and pushes the receiving bar 35, and the safety device 31 rotates so that the wire rope receiver 34 moves upward, and the engaging portion 33 engages. Separate from piece 32.
At this time, the wire rope 16 has a slack that allows the main rod 6 to be tilted by the biasing force of the compression spring 38, and the main rod 6 is tilted at an angle that does not cause any danger.

In the present invention, the main rod is not limited to the above-mentioned embodiment, and the number of stages of the lifting rod may be increased or a single main rod may be provided without any lifting rod. Furthermore, the structure or presence or absence of a locking device or compression spring is not a limitation of the present invention. For example, the tilting may be started by pushing the main rod by hand. Furthermore, the configuration of the safety gear is not limited to the above embodiments, and the shape of the engaging part of the safety gear can be changed at any time depending on the space, and the shape of the wire rope receiver can also be changed depending on the receiving bar. If so, it is not necessarily necessary to have a closed loop as in the embodiment, and for example, the shape of the wire rope receiver may be U-shaped, and a stopper may be provided to limit the rotation of the safety equipment.

[Effect of idea]

According to the collapsible strut of the present invention, when the wire rope is unwound too much and becomes extremely slack, the safety gear rotates in the direction of moving downward along the wire rope receiver, and the engaging part side engages with the main rod. It is engaged with the joint piece and is fixed to the support rod with the main rod standing upright.
Therefore, the main rod cannot be tilted when the wire rope is excessively slack, and the main rod will not be tilted at a large angle sharply, so there will be no harm to the worker or damage to the equipment. This effect is produced.

Further, if the wire rope receiver is formed into a closed loop as in the embodiment, the wire rope will not come off from the receiver bar, so that the device can operate reliably.

[Brief explanation of drawings]

Fig. 1 is a side view showing how the embodiment of the present invention is used, Fig. 2a is an explanatory view from the side showing the operation of the embodiment, Fig. 2b is an explanatory view from the front,
The figure is a side view showing the state of use of the conventional example, and FIG. 4 is an explanatory diagram of the operation of the main rod. 1...Retractable post, 5... Support rod, 6... Main rod,
16...wire rope, 31...safety equipment, 32...
...Engagement piece, 33...Engagement portion.

Claims (1)

[Scope of utility model registration request] In a collapsible support column in which the central part of the main rod is rotatably attached to the support rod, and the main rod can be tilted or raised by unwinding the wire rope, if the wire rope is slack beyond a certain level, A collapsible column characterized in that the support rod is provided with a safety device whose one end engages with the main rod and is pressed by the wire rope to release the engagement when the wire rope is tensed.