JPS5919196Y2 - telescopic rod - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a telescoping rod used as a support for, for example, a hair dryer, an elevating table, a clothes hanger, etc.

Conventional telescoping rods of this kind have two pipes, an inner and an outer pipe, connected in a telescopically fixed manner, but each pipe uses a round pipe, so the pipe on the movable telescoping side can easily rotate, and the upper end of the pipe can be easily rotated. The orientation of the attached supported object is not stable.

In addition, with conventional models, the inner pipe is fixed to the outer pipe by pressing a hard ball against the outer circumferential surface of the inner pipe, which causes scratches on the inner pipe surface, which are exposed to the outside when the inner pipe is pulled out. The disadvantage is that it is unsightly.

This invention solves the above-mentioned conventional drawbacks, and its gist is that a window hole is bored along the circumferential direction in the inner bite tube, a wedge body is fitted into the window hole, and a wedge body is fitted into the window hole in the circumferential direction. A pyramid-shaped pressing body is provided inside the body, and the wedge body is compressed between the pressing body and the outer pipe, and the inner and outer peripheral pipes are fixed to each other by this clamping pressure.

The details will be explained below based on an illustrated example.
1 is an outer pipe, 2 is an inner pipe inserted inside the outer pipe 1, and the inner end (the upper end in the drawing) of the inner pipe 2 has several pieces arranged at equal intervals along the circumferential direction (in the illustrated example, 3) window holes 3, . . . are bored.

Reference numeral 4 denotes a pyramid-shaped pressing body provided at the central position inside these window holes 3, . , . . ., several of these pressing surfaces 4a, . . .
,... is designed to face directly.

A wedge body 5 is inserted between the pressing surface 4a and the inner surface of the outer pipe 1, and is fitted into each of the window holes 3, . . . of the inner pipe 2.

In this example, a tapered roller was used as the wedge, but
Other shapes may also be adopted, such as a shape having surfaces that make surface contact with the inner surface of the outer pipe and the pressing surface, respectively, or a spherical shape.

The pressing body 4 is integrally attached to the round connecting rod 6 by cutting a part thereof, and the connecting rod 6 is loosely inserted into the inner pipe 2.

Reference numeral 7 denotes a spring compressed and interposed between the inner end of the inner pipe 2 and the inner end of the connecting rod 6. The spring 7 applies elastic force to the pressing body 4 in the direction toward the inner end of the inner pipe 2. The wedge body 5 is always pressed between the pressing surface 4a and the inner surface of the outer pipe 1 due to elasticity.

The connecting rod 6 is connected to an operating member such as a pedal 8 at the outer end of the inner pipe 2.

9 is a U-shaped engagement fitting provided at the lower end of the connecting rod 6, and 10 is a retaining pin.

Reference numeral 11 denotes a protection tube, which is erected at a predetermined position on the base 12.

13 is a buffer spring for the outer pipe 1, and 14 is a retaining ring for the connecting rod 6.

In the above configuration, the wedge body 5 can freely move within the window hole 3, but the pressing body 4 in contact with the wedge body 5 is always biased toward the inner end of the inner pipe 1 (upward in the figure). Since this pressing body 4 presses the wedge body 5 against the inner surface of the outer pipe 1, the wedge body 5 is fixed to the outer pipe 1 by the pressure between the pressing surface 4a and the inner surface of the outer pipe 1, and this wedge body The outer pipe 1 and the inner pipe 2 are fixed to each other via the body 5, and in this state, both pipes 1 and 2 support the load in the direction of contraction.

In this case, when the outer pipe 1 tries to slide in the shortening direction due to the load, the wedge body 5 follows the outer pipe 1 and bites deeper into the wedge-shaped space between the inner surface of the outer pipe 1 and the pressing surface 4a. This makes the fixation of both pipes 1 and 2 even stronger.

Next, when the pedal 8 is depressed and the connecting rod 6 is pulled outward (downward in the figure), the pressing body 4 moves outward, and the pressure on the wedge body 5 between the pressing body 4 and the outer pipe 1 is released. Since the outer pipe 1 can be expanded and contracted, both pipes 1 and 2 can be moved again by pulling or lowering the outer pipe 1 to change the length of the entire telescopic rod, and then releasing the operating force in this state. fixed to each other.

By the way, when viewed along the longitudinal direction of the pipe, the inner surface of the outer pipe 1 and each pressing surface 4a form a space that is enlarged in the center and narrowed on both sides, as shown in FIG. Since the wedge body 5 is fitted into the enlarged central part, when the outer pipe 1 tries to twist and rotate, the wedge body 5 follows this outer pipe 1 and connects the corner of the pressing body 4 and the outer pipe. 1
The outer pipe 1 is forced into the narrow space between the inner pipe 2 and the outer pipe 1, and due to the wedge effect, the outer pipe 1 is immovably fixed to the inner pipe 2 in the circumferential direction.

Therefore, the outer pipe 1 does not twist or rotate inadvertently with respect to the inner pipe 2.

In the illustrated embodiment, the telescopic rod is erected with the outer pipe 1 at the top, but it may be used with the outer pipe 1 at the bottom, or it may be used sideways so as to support a horizontal load.

Furthermore, in the embodiment, a pressing body that tapers toward the inner end of the inner pipe 2 is used, but the direction of the pressing body is reversed, and elasticity is applied in the direction in which the pressing body tapers. This results in a telescoping rod capable of supporting tensile loads.

Note that the interlocking means between the pressing body 4 and the operating member is not limited to the rod shown in the figure, but other members such as wires may also be used, and members such as the connecting rod 6 that are integrated with the pressing body 4 may be used. directly,
It is also possible to use it as an operating member.

As mentioned above, in this device, the wedge body fitted into the window hole of the inner pipe is compressed between the pressing body inside the wedge body and the inner surface of the outer pipe, thereby fixing both the inner and outer pipes to each other. The length of expansion and contraction of both the inner and outer pipes can be changed by pushing or pulling the operating member connected to the pressing body.

In particular, in this invention, since the pressing body is pyramid-shaped, when the outer pipe tries to twist and rotate relative to the inner pipe, the wedge body ends up biting into the narrow part between the inner surface of the outer pipe and the corner of the pressing body. Since both pipes are fixed to each other, twisting and rotation of the pipes is prevented, and the orientation of the supported object is stabilized.

Further, in this invention, since the wedge body is pressed against the inner surface of the outer pipe, the scar caused by the wedge body is not exposed to the outside, and the appearance is good.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the telescoping rod of this invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1...Outer pipe, 2...Inner pipe, 3
... Window hole, 4 ... Pressing body, 4a ...
... Pressing surface, 5 ... Wedge body, 6 ... Connection rod, 7 ... Spring, 8 ... Pedal.

Claims (1)

[Scope of utility model registration request] Several window holes are bored along the circumferential direction in the inner pipe inserted inside the outer pipe, and a pyramid-shaped pressing body having a tapered pressing surface is provided at the center position inside these window holes. A wedge is fitted into the hole between the pressing surface of the pressing body and the inner surface of the outer pipe, and the wedge is pressed between the pressing surface and the inner surface of the outer pipe from the inner pipe to the pressing body. A telescopic rod that is elastically energized and that releases the pinching pressure of a wedge body by pushing or pulling an operating member connected to a pressing body.