JPS6314336Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a collapsible lifting device used for a projector or the like.

Conventionally, this type of elevating device is too tall when not in use or when being transported, so it has generally been constructed so that the elevating section can be folded down. FIG. 3 shows a projector equipped with an example of such a lifting device, and FIG. 3 will be explained below.

The collapsible lifting device 51 has a generator 5 on a base 52.
It is provided along with 3. The collapsible lifting device 51
The lifting section 5 is attached to a support 54 that is vertically installed on a base 52.
5 is installed. The elevating part 55 is a storage rod 56
and the lifting rods 57 and 58 stored in the storage rod 56.
It depends. The storage rod 56 is rotatably supported by the upper end of the support column 54 on the outer circumferential surface of the central portion. The lifting rod 57 is installed inside the storage rod 56,
The elevating rod 58 is further housed inside the elevating rod 57, and is slidably protruded from the upper end of the storage rod 56 or the elevating rod 57, respectively.

The lifting rods 57 and 58 are respectively equipped with pulleys 59 and 60 and pulleys 61 and 62, as shown in FIG. is lifting rod 5
Mounting holes 63, 64 drilled in the lower wall of 7, 58
It is attached across the rod walls of each lifting rod 57, 58. One end of the wire rope 65 is fixed below the attachment position of the pulley 61 on the lifting rod 58, and thereafter
0, and then guided by a pulley 66 installed above the inner wall of the storage rod 56, and then moved by a pulley 67 installed at the lower end of the storage rod 56.
6 A pulley 6 guided outside and fixed to the column 54
The other end is locked to a winch 69 that is guided below the support column 8 and installed above the support column 54.

With such a configuration, the lifting rods 57 and 58 are
The winch 6 attached to the support column 54 when vertically
By unwinding the wire rope 65 with 9, the spacing between the pulleys 66 and 60 and the pulleys 59 and 62 is changed as shown in FIGS.
The length of the protrusion from the upper end of 6 can be adjusted. Further, the wire rope 65 is unwound to lower the lifting rods 57 and 58 to the lowest position, and the wire rope 65 is further unwound slightly to give slack to the wire rope 65, and then the lifting section 55 (i.e., the storage rod 56) is moved. The wire rope 65 is tilted by the slack of the wire rope 65, and then the wire rope 65 is tilted by the winch 69.
When the elevating section 55 is unwound, the elevating section 55 rotates forward about the connecting portion with the support column 54, and the elevating section 55 becomes approximately horizontal as shown by the two-dot chain line in FIG. It is designed to be stabilized by coming into contact with the storage rod receiving part 70 which is fixedly connected to the storage rod receiving part 70.

The conventional collapsible lifting device as described above has the following drawbacks. That is, due to the structure of the above-mentioned collapsible lifting device 51, when the lifting rods 57 and 58 are lowered to the lowest position and the lifting unit 55 is then tilted, the gravity above the lifting unit 55 (in FIG. 3, the lighting lamp 7
Therefore, if the storage rod 56 remains upright, even if the wire rope 65 is unwound, the wire rope 65 will only become loose and the elevating section will not be able to move. 55
is not tilted. For this reason, the lifting rods 57, 58
When the wire rope 65 reaches its lowest point, it is necessary to artificially tilt the storage rod 56 by the amount of slack in the wire rope 65. Conventionally, this tilting work had to be done by hand each time, which was extremely troublesome in terms of smooth overall work.

This invention was developed in consideration of the above circumstances, and aims to provide a collapsible lifting device in which the storage rod and lifting rod are locked and at the same time, the storage rod is tilted by the amount of slack in the wire. The central part of the storage rod is rotatably attached to the upper end of the support column, and a lifting rod that protrudes from the upper end of the storage rod is installed inside the storage rod. In the collapsible lifting device, the storage rod can be raised and lowered by unwinding a wire rope using a winch, and when the lifting rod reaches its lowest position, the storage rod can be tilted by unwinding the wire rope. The gist is that a spring is provided that elastically biases the lower part of the storage rod in the rotating direction when standing.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 1 and 2.

Reference numeral 1 denotes a collapsible lifting device according to an embodiment of the present invention used in a projector, and members corresponding to the conventional projector and foldable lifting device shown in FIG. 3 are designated by the same reference numerals. is attached. This foldable lifting device 1
A locking piece 2 is rotatably attached to the storage rod 56. This locking piece 2 can engage with the locking portion 3 provided on the support column 54 when the storage rod 56 is in an upright state, and this engagement causes the storage rod 56 and the support column 54 to be in a fixed state. It's starting to be said that On the other hand, when the storage rod 56 is vertically fixed to the support column 54, the lower part of the storage rod 56 is supported by the compression spring 4 whose one end is fixed to the mounting plate 54' fixed to the support column 54. It is elastically biased in the rear rotational direction, and due to this elastic bias,
When the locking piece 2 and the locking portion 3 are disengaged, the storage rod 56 rotates about the connecting portion with the support column 54 and tilts by the amount of slack in the wire 65.

The collapsible lifting device 1 configured as described above is
When the locking piece 2 is removed from the locking part 3 to release the fixed state between the storage rod 56 and the support column 54, the lower part of the storage rod 56 is pushed rearward by the biasing elasticity of the compression spring 4 at the same time as this release, and the storage rod 56 is pushed backward by the biasing elasticity of the compression spring 4, The slack portion of the wire 65 is inclined about the connecting portion with the wire 54 as an axis.

In the above embodiment, the number of stages of the lifting rod is not limited to two stages as in the embodiment, but may be only one stage, or may be three or more stages.

As is clear from the above explanation, when the collapsible lifting device according to the present invention is used, it is possible to release the fixation between the column and the storage rod, and at the same time, the storage rod can be tilted by the amount of slack in the wire by the biasing force of the spring. This eliminates the need for the troublesome work of artificially tilting the storage rod when moving from tilting to tilting work, and the work can be performed continuously and safely without interruption, resulting in a significant improvement in work efficiency. play.

[Brief explanation of the drawing]

Figure 1 is a right side view showing an embodiment of the present invention, Figure 2 is a right side view showing an embodiment of the present invention.
The figure is an enlarged view of the main part of FIG. 1 with a part cut away, FIG. 3 is a right side view of the conventional example, and FIG. 4 is a partially sectional view of the same. 1... Floodlight, 4... Compression spring, 54... Strut, 56... Storage rod.

Claims (1)

[Scope of Claim for Utility Model Registration] The central part of the storage rod is rotatably attached to the support, and an elevating rod that protrudes from the upper end of the storage rod is installed inside the storage rod, so that the storage rod stands vertically. In the collapsible elevating device, the elevating rod can be raised or lowered by unwinding a wire rope using a winch when the user is in the room, and the storage rod can be tilted by unwinding the wire rope when the elevating rod reaches its lowest position. A collapsible lifting device characterized in that the support is provided with a spring that elastically biases the lower part of the storage rod in the rotating direction when it is vertically raised.