JPS6237855Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a ball-chucking type hanging device that suspends and holds various items from the ceiling of a store using wires. The purpose is to prevent wire cutting accidents caused by objects being caught.

The wire 6 used in this type of hanging device is generally a wire with a diameter of about 1 to 2 mm, which is made by twisting several child wires 6b, which are made by twisting several ultra-fine steel wires 6a, and then twisting several wires together, as shown in Fig. 8. is used. Using the tapered surface of the wire 6 as shown in FIG.
When the wire is clamped by two balls 21, when a large hanging load is applied and the wire clamping force by the balls 21 acts strongly, the wire cross section, which is originally approximately circular, deforms into a triangular shape, and the child wire 6b is also locally deformed. steel wire 6a
The arrangement of the steel wires 6a is disrupted, the twists of the steel wires 6a are locally untwisted, and the steel wires 6a are locally deformed to easily cause strong stress concentration, resulting in partial breaks in the steel wires 6a. When the twist is broken in this way, the frictional force between the steel wires 6a and between the child ropes 6b decreases greatly, and the stress dispersion function deteriorates, so that a partial cut of the steel wire 6a becomes a partial cut of the child wire 6b. This eventually leads to the entire wire 6 being cut.

Normal stainless steel [SUS27WR (JISG4308)]
A further 7 child ropes 6b made by twisting 7 steel wires 6a
In the wire 6 with a diameter of 1.5 mm made by actually twisting,
Even though this itself has the strength to withstand a load of 190 to 195 kg, it has a diameter of 2.5 mm.
In the case of a chucking structure with steel balls 21, cutting is performed with a load of 40 to 50 kg, and at most 85 to 90 kg. The inventor conducted a prototype experiment with the idea of making the ball 21 made of brass, and was able to withstand a load of 90 to 115 kg using three balls under the same conditions, but there were still concerns about safety. was insufficient, and there was still room for improvement.

This invention was proposed in order to eliminate such conventional problems, and in a ball-chucking type lifting device, it effectively disperses the stress at the part where the wire is held by the ball, thereby ensuring that the wire does not break. The aim is to prevent this from happening.

Hereinafter, the details will be explained based on the drawings. The drawings illustrate a hanging tool for hanging various articles from the ceiling.

In FIG. 1, 1 is a ceiling surface, 2 is a ceiling panel, 3 is an attic space formed between the ceiling surface 1 and the ceiling panel 2, 4 is an attic horizontal member installed in this space 3, 5 is a wire attachment pipe attached to the horizontal member 4 and whose lower end faces into the room from the ceiling panel 2; 6 is a thin wire made of twisted steel wire (about 1.5 mm in diameter) hanging from the lower end of the pipe 5; 7 is wire 6
The hanging tool 8 of the present invention, which is attached to the lower part of the hanging tool 7, is a suspended article.

The hanging tool 7 of the present invention includes a vertically long circular outer cylinder 10 that is fixed to an article to be hung 8 via a mounting bracket 9, and a tapered surface 12 that is screwed into the upper end of the outer cylinder 10 and expands downward inside. A tapered cylinder 13 is formed in a series with a constant slope, chucking balls 14 and 15 are arranged in two stages (three each on top and bottom) so as to be inscribed in the tapered surface 12, and are inserted into the outer cylinder 10 so as to be vertically movable. It consists of a ball holding cylinder 16 that is fitted and holds the balls 14 and 15 so as to be movable in the radial direction, and a spring member 17 that is housed inside the outer cylinder 10 and pushes and biases the ball holding cylinder 16 upward.

The ball holding cylinder 16 has an insertion hole 18 in the center through which the wire 6 is inserted, and ball holes 19 and 20 for holding the upper and lower balls 14 and 15 so as to be freely retractable in the radial direction are provided at the upper and lower intermediate parts thereof. Perforations are made at equal pitches in the circumferential direction in each stage. In addition, the upper and lower ball holes 19 and 20 have a phase difference of 60 degrees in the circumferential direction as shown in FIGS. 3 and 4.
Moreover, each ball hole is placed in the same phase position so that the balls 14 and 15 can be chucked as close as possible vertically to each other as shown in FIG.
Assuming there are 9 and 20, both holes are 19 and 20.
are arranged so that they overlap top and bottom. The lower ball 15 inscribed in the lower large diameter side portion of the tapered surface 12 has a larger diameter than the upper ball 14 so that the chucking diameter is the same in the upper and lower stages.

It is desirable that each of the balls 14 and 15 be made of a metal material softer than the steel wire of the wire 6, specifically, brass. Of course, a normal steel ball may also be used. Specifically, the large diameter balls 15 on the lower stage have a diameter of 3.0 mm, the small diameter balls 14 on the upper stage have a diameter of 2.6 mm, and each ball hole 19 is formed 0.1 mm larger.
20, and the distance between the centers of the upper and lower balls 14 and 15 is set to 2.5 mm.

Next, when suspending the suspended article 8 from the wire 6, first insert the lower end threaded portion 10a of the outer cylinder 10 of the hanging device 7 into the screw hole of the mounting bracket 9 fixed to the upper surface of the suspended article 8. Screw it into place. In this case, the intermediate large diameter portion 16a of the ball holding cylinder 16 into which the wire 6 has not yet been inserted is connected to the tapered surface 12.
The balls 14 and 15 are biased slightly upward by the spring member 17 to the upper limit where they come into contact with the cylinder, and the balls 14 and 15 are brought toward the cylinder center by the tapered surface 12.

The lower end portion 6c of the wire 6 is twisted and prevented from returning by soldering or the like as necessary, and then the lower end portion 6c is inserted into the insertion hole 18 from the upper end of the ball holding cylinder 16.
As it passes through, the lower end portion 6c first hits the three upper balls 14 that are approaching, and pushes the ball holding tube 16 down a little against the spring member 17. With this, the distance between the upper and lower balls 14 and 15 is widened along the tapered surface 12, and the wire 6 can be pushed downward to a desired position through between the balls 14 and 15.

When the pushing of the wire 6 is stopped, the ball holding cylinder 16 is pushed upward by the force of the spring member 17.
Accordingly, the tapered surface 12 pushes the balls 14 and 15 in the centripetal direction to narrow the gap between them, and the wire 6 is held between the balls 14 and 15 in two stages, upper and lower.
Furthermore, when the suspended article 8 is unsupported and its weight is applied to the hanging tool 7, a downward load is applied to the outer cylinder 10, and the chucking force by the tapered surface 12 further increases, and the wire 6 is moved to the ball 14.・It is strongly clamped and fixed by 15.

In this case, since the six upper and lower balls 14 and 15 simultaneously hold the wire 6, the load is distributed, and the local digging of the individual balls into the wire 6 is reduced. In addition, since the upper and lower balls 14 and 15 are out of phase in the circumferential direction and sandwich the wire 6 close to each other vertically, even if the cross section of the wire is deformed into a substantially triangular shape at each of the upper and lower pinching locations, The deformation actions of the lower stage having different phases check and prevent each deformation by the wire rigidity. As a result, the cross section of the wire is maintained in a shape close to the original circular shape, and local untwisting and deformation of the steel wire 6a and the child rope 6b that make up the wire 6 are extremely reduced, and the entire wire is cut from a local cut. The development of a disconnection is prevented.

Here, if the balls 14 and 15 are made of brass, the balls 14 and 15 are crushed and deformed so as to follow the spiral irregularities on the circumferential surface of the wire 6, and are crimped by surface contact, as shown in FIG. Since local biting into the wire 6 is eliminated, cutting can be more effectively prevented.

FIG. 7 shows a second embodiment of the present invention, in which the upper ball 14 and the lower ball 15 do not overlap in the vertical direction, but are in close proximity with a slight distance between them. In this way, each of the upper and lower ball holes 19
As long as the wires 20 are received and abutted against a series of tapered surfaces 12 having the same slope, and the wires 6 are vertically spaced apart from each other so that they do not untwist, the wires 20 may be close to each other vertically or may be separated from each other.

Note that when changing the height of the suspended article 8 or removing it, the chucking effect can be eliminated by pushing the upper end protrusion of the ball holding tube 16 against the spring member 17 while the article 8 is once supported. It is released and the wire 6 can be inserted and removed freely.

In addition, although the illustrated example shows the case where the hanging tool 7 is attached to the suspended article 8, the hanging tool 7 is installed upside down in the pipe 5 on the ceiling side, and the hanging article 7 is attached to the lower end of the hanging article 7. Alternatively, the upper part of the wire 6, which has been appropriately fixed, may be clamped and fixed by the hanging tool 7. The hanging fixture 7 may be directly fixed to the attic horizontal member 4 or the like. That is, in the present invention, the hierarchical relationship is for convenience of explanation. Alternatively, the tapered surface 12 may be integrally formed on the inner surface of the outer cylinder 10.

As explained above, according to the hanging device of this invention, a set of three balls 14 and 15 on the upper and lower sides are arranged with mutually different circumferential phases and are arranged sufficiently close to each other on the upper and lower sides. Not only has the number increased, but the clamping force due to the ball biting at the upper and lower clamping parts works synergistically to suppress each deformation, and the cross section of the wire is maintained in a shape close to its original circular shape. Local untwisting and deformation of the steel wire 6a and child rope 6b are extremely reduced, and a large load can be safely suspended. In addition, since the upper and lower balls 14 and 15 with different diameters are located on a series of tapered surfaces 12 with a constant slope formed in the outer cylinder 10, assembly is easy and all the balls 14 and 15 have the same chucking diameter. It is possible to uniformly contact the outer periphery of the wire. Specifically, balls 14 and 15
Even if the steel ball or brass ball is 50~60Kg each
It was able to withstand even moderate loads, and especially when brass balls were used, the strength was close to that of wire.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the hanging tool according to the present invention, FIG. 1 is a partially longitudinal front view of the suspended article in use, and FIG. 3 is an enlarged vertical sectional view of the proposed hanging fixture, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG.
5 is a perspective view of a ball holding tube which is one of the constituent members of the present invention, and FIG. 6 is an enlarged longitudinal sectional view of the main parts of the hanging tool of the present invention. FIG. 7 is a longitudinal sectional view corresponding to FIG. 2 showing a second embodiment of the present invention. FIG. 8 is a cross-sectional view of the wire, and FIG. 9 is a cross-sectional view showing a wire clamping part in a conventional ball chuck system. 6... wire, 8... suspended article, 9... mounting bracket, 10... outer cylinder, 12... tapered surface, 13
...Taper tube, 14/15...Ball, 16...
...Ball holding cylinder, 19/20...Ball hole.

Claims (1)

[Scope of utility model registration request] An outer cylinder 10 in which a series of tapered surfaces 12 are formed at a constant slope inside the upper end in a downwardly expanding shape, and a set of three balls 14 and 15 arranged in upper and lower stages so as to be inscribed in the tapered surfaces 12, A ball holding cylinder 16 that is vertically movably inserted into the outer cylinder 10 and holds each ball 14 and 15 movably in the radial direction;
A spring member 17 is installed inside the ball holding cylinder 16 and urges the ball holding cylinder 16 upward.
has an insertion hole 18 in the center for passing the wire 6 made of twisted thin steel wires, and the upper and lower balls 14.1
5 are close to each other in the vertical direction, and are located at equal pitches in the circumferential direction in each of the upper and lower stages, and are arranged at different positions in the circumferential direction, such that the balls 15 in the lower stage are adjacent to the balls in the upper stage. 14, and the chucking diameters of the upper and lower balls 14 and 15 are formed to be the same.