JPH0433981Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention allows a worker to grasp and operate the handle of a spray rod with a spray head at the tip with both hands.
Regarding a telescoping lock device for locking a telescoping device that adjusts the length of the spray rod in a manual spray rod designed to spray a chemical solution fed from a pump device via a hose. Regarding improvements.

[Prior Art] As shown in Fig. 1, a manual spray rod has the following features:
The proximal end of the pipe 2 on the distal end, on which the jet heads 1 and 1 are attached, is slidably inserted into the lumen on the distal end of the pipe 4 on the proximal end, on which the handle 3 is installed, so that the length can be freely adjusted. This fitting part is screwed into the tip of the pipe 4 on the proximal end by screwing the cap nut-shaped cap 5, which has been fitted into the pipe 2 on the distal end, into the pipe 4 on the proximal end. A holding member that tightens and holds the circumferential surface of the pipe 2 is tightened and locked, and the joint portion is held watertight by compression by the cap 5 of the holding member.

[Problem to be solved by the invention] In order to adjust the length of the manual spray rod A configured as described above, first, tighten the kettle device 6 at hand to stop the supply of the chemical solution. Then, turn the cap 5 to loosen the joint part, insert and remove the pipe 2 on the distal end from the pipe 4 on the proximal end to obtain the desired length, and then screw the cap 5 again. This is done by tightening the joint, but since the chemical solution remaining in the spray rod A remains under pressure even if the device 6 at hand is closed, turn the cap 5 to tighten it. When the spray rod is loosened, the watertightness at the joint is broken, causing the chemical solution remaining in the spray rod to flow out and adhere to the hands and clothes of the worker, contaminating them.

As a measure to solve this problem, there is a method disclosed in Japanese Utility Model Application Publication No. 57-115671. This method involves forming an enlarged diameter part with a male thread on the outer circumferential surface on the distal end side of a large diameter pipe into which the proximal end of a small diameter pipe is slidably inserted. A cone-shaped sleeve with a split is inserted, and this is pushed in by tightening a cap nut-shaped tightening cylinder that is screwed onto the outer periphery of the enlarged diameter portion, and is previously fitted onto the outer periphery of the small diameter pipe. The proximal end of the small-diameter pipe inserted into the large-diameter pipe is compressed to compress the O-ring kept in place and tighten the small-diameter pipe, and to prevent leakage when the tightening cylinder is loosened. It has a structure in which a piston-shaped end cylinder is connected to the side and fits water-tightly into a large-diameter pipe.

However, this method requires a connecting tube connected to the proximal end of a small-diameter pipe, and an O-ring on the outer periphery of the connecting tube to maintain watertightness between the connecting tube and the large-diameter pipe. , by being added,
As the number of parts increases, manufacturing becomes more troublesome.
There is also the problem of increased costs.

The present invention has been made to solve these problems that occur with conventional means. O provided at the joint part
This method proposes a new means that can accurately prevent the leakage of chemical liquid when the joint part is loosened, using only a ring, with a small number of parts, and without increasing costs. It is.

[Means for Solving the Problems] In the present invention, as a means to achieve this object, the distal end of a large diameter pipe into which the proximal end of a small diameter pipe can be freely inserted and removed is made into a bag-like shape. A threaded portion is formed on the outer circumferential surface of the enlarged diameter portion, and a cylindrical cavity is formed between the inner circumferential surface of the enlarged diameter portion and the outer circumferential surface of the pipe. In addition to fitting an O-ring to maintain watertightness between the inner circumferential surface of the enlarged part and the outer circumferential surface of the small diameter pipe, an O-ring with a tapered cone-shaped tip and a cut along the axial direction at the tip is fitted. The proximal end of the sleeve is inserted and fitted into the enlarged diameter section, and a cap formed in the shape of a cap nut is placed over the tip of the sleeve and the outer periphery of the enlarged diameter section. A lock for expansion and contraction in a manual spraying rod, which is fitted with a ring-shaped pressing part that is screwed into the threaded part and that presses the inner end of the lumen of the cap to the middle of the inclined surface of the cone-shaped tip of the sleeve. In the device, the sleeve is formed from a synthetic resin material into a cylindrical shape whose inner diameter is loosely fitted around the outer periphery of the pipe with a small diameter, and the outer periphery of the proximal end is tightly fitted to the inner periphery of the enlarged diameter part. forming a flange portion that abuts the tip surface of the enlarged diameter portion on the tip side;
And, the length from the flange to the rear end surface of the proximal end is the length from the rear end of the proximal end when the proximal end is press-fitted into the enlarged diameter part until the flange hits the distal end surface of the enlarged diameter part. The end face is set to a length that compresses the O-ring and packing interposed between the rear end face and the stepped part on the inner end side of the enlarged diameter part, and on the base end side of the small diameter pipe, The present invention proposes a locking device for extension and contraction in a manual spraying rod, which is equipped with a collar whose outer diameter corresponds approximately to the inner diameter of a large-diameter pipe.

[Example] Next, an example will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as in the previous means are used for constituent members having the same effect.

In Fig. 2, 2 is a small-diameter pipe on the distal end side of which the jet head 1 is installed, and 4 is a small-diameter pipe into which the base end of the small-diameter pipe 2 is inserted and removed, and a handle 3 is installed on the outer periphery. 5 is a cap, and 7 is a sleeve made of synthetic resin that is fitted around the outer periphery of the small diameter pipe 2. 8 indicates an O-ring, and 9 indicates a packing that serves as a seat for the O-ring.

The small-diameter pipe 2 on the tip side is formed from a metal material, and has an engaging flange 20 that expands in the radial direction at its base end.
has been established.

The large-diameter pipe 4 on the proximal end side is formed into a long cylindrical body made of a metal material, and the inner diameter approximately corresponds to the outer diameter of the engaging flange 20 of the pipe 2 on the distal end side. As shown in FIG. 3, it is formed into an enlarged diameter portion 40 that expands into a bag shape. A threaded portion 41 is formed on the outer peripheral surface of the enlarged diameter portion 40. This enlarged diameter portion 40 forms a cylindrical cavity w between its inner circumferential surface and the outer circumferential surface of the small diameter pipe 2, as shown in FIG.

Reference numeral 8 denotes an O-ring that can be fitted into the cavity w, which is fitted in advance to the outer periphery of the small-diameter pipe 2, and by fitting and inserting the large-diameter pipe 4 so as to cover the outer periphery of the pipe 2, It is located within the vacant room w. At this time, an annular packing 9 made of a synthetic resin material is first fitted onto the outer periphery of the small diameter pipe 2, and as shown in FIG. It is designed to form a seat that abuts against the stepped portion 40a located on the inner end side of the chamber w and supports the O-ring 8 in the axial direction.

The sleeve 7 is formed by molding a synthetic resin material into a cylindrical shape that is fitted around the outer periphery of the pipe 2 on the distal end side.
The inner diameter thereof is formed so as to fit loosely into the outer periphery of the small diameter pipe 2 on the tip side. As shown in FIG. 4, the cylindrical base end 70 has a continuous flange 71 that expands in diameter toward the distal end, and a cone-shaped tip that gradually decreases in diameter toward the distal end of the flange 71. Part 7
2 is continuous, and its tip 72 has four axial cuts 73... formed at four equally spaced positions in the circumferential direction, and its cylindrical shape is The outer diameter of the proximal end portion 70 is made to correspond to the inner diameter of the enlarged diameter portion 40 of the large diameter pipe 4 described above, so that it is tightly fitted into the enlarged diameter portion 40. The outer diameter thereof is formed to be somewhat smaller than the outer diameter of the enlarged diameter portion 40. Furthermore, this sleeve 7 has a length from the flange 71 to the rear end surface of the proximal end 70 , and the flange 71 extends beyond the enlarged diameter portion 40 .
When the proximal end 70 is press-fitted into the enlarged diameter portion 40 until it hits the distal end surface of
The O-ring 8 and the packing 9 interposed between the two O-rings 8 and 9 are set so as to be compressed as shown in FIG.

The cap 5 has an outer end side (third
A female thread 50 is formed on the right end side in the figure to be screwed into the threaded portion 41 provided on the outer circumferential surface of the enlarged diameter portion 40 described above, and a cone-shaped female thread 50 is formed on the inner end side of the bore. An annular pressing portion 51 with a reduced diameter is formed in the middle of the inclined surface of the tip portion 72 forming the shape.

The apparatus according to the present invention constructed as described above operates as follows.

As shown in Figure 5, packing 9 and O
The ring 8 is fitted into the cavity w formed between the outer peripheral surface of the small diameter pipe 2 and the inner peripheral surface of the enlarged diameter part 40 of the large diameter pipe 4, and the base of the sleeve 7 is inserted from the outside. If the end portion 70 is press-fitted until the flange portion 71 abuts against the end surface on the distal end side of the enlarged diameter portion 40, the sleeve 7
The outer circumferential surface of the proximal end portion 70 fits tightly into the inner circumferential surface of the enlarged diameter portion 40, and the rear end surface of the proximal end portion 70
The ring 8 and packing 9 are pressed against the stepped portion 40a and compressed into a predetermined shape. As a result, the O-ring 8 is positioned between the rear end surface of the proximal end portion 70 of the sleeve 7 and the pushed-in packing 9, and the O-ring 8 is positioned between the inner circumferential surface of the enlarged diameter portion 40 and the outer circumferential surface of the small diameter pipe 2. It now maintains watertightness between the
In this state, the small diameter pipe 2 loosely fitted into the sleeve 7 is in a state where it can freely slide in the longitudinal direction.

That is, since the sleeve 7 is molded from a synthetic resin material, the proximal end portion 70 press-fitted to the inner peripheral side of the enlarged diameter portion 40 is tightly fitted to the enlarged diameter portion 40.
From then on, it will remain in this state. As a result, the O-ring 8 maintains watertightness between the inner circumferential surface of the enlarged diameter portion 40 and the outer circumferential surface of the small diameter pipe 2. and,
In this state, the small diameter pipe 2 can be freely inserted into and removed from the large diameter pipe 4.

Next, when the cap 5 is screwed in from this state, the diameter-reducing ring-shaped pressing part 51 provided on the inner end side of the lumen of the cap 5 will cause the slope of the cone-shaped tip 72 of the sleeve 7 to The tip 72 is squeezed by pressing in the middle of the surface, thereby narrowing the tip 7.
2 is pressed against the outer peripheral surface of the small-diameter pipe 2 to firmly hold the pipe 2, thereby locking the movement of the pipe 2.

Next, if the cap 5 is turned to loosen the tightening from the above-mentioned state, the cap 5 will move in the axial direction while leaving the sleeve 7, which is integrally fitted to the enlarged part 40, in the above-mentioned position. As a result, the pressing part 51 separates from the circumferential surface of the tip 72 of the sleeve 7 and releases the tightening,
As a result, the tip 72 of the sleeve 7 is restored and the peripheral surface of the small diameter pipe 2 is released from being held, allowing the small diameter pipe 2 to freely slide in the longitudinal direction, so the length can be adjusted in this state. can be done.

At this time, the outer circumferential surface of the small diameter pipe 2 and the enlarged part 4
Watertightness between the O-ring 8 and the inner circumferential surface of the O-ring 8 is maintained by the O-ring 8, which does not change its state.

[Effects of the invention] As explained above, the locking device for expanding and retracting the manual spray rod according to the invention is effective for tightening the joint portion where the small-diameter pipe 2 and the large-diameter pipe 4 are slidably fitted together. The sleeve 7 is molded from a synthetic resin material, and its proximal end 70 is press-fitted into the enlarged diameter part 40 on the tip side of the large-diameter pipe 4, so that the sleeve 7 is tightly fitted. The proximal end is then held in that state, and when the flange 71 that restricts the end of the press-fitting of the proximal end 70 to the enlarged diameter part 40 abuts against the distal end surface of the enlarged diameter part 40, the proximal end The rear end surface of the section 70 compresses the O-ring 8 interposed between the outer circumferential surface of the small diameter pipe 2 and the inner circumferential surface of the enlarged diameter section 40 of the large diameter pipe 4 in this joint section. Since the length from the flange 71 to the rear end surface of the proximal end 70 is set, the O-ring 8 interposed in this joint part loosens the screwing of the cap 5 and connects the distal end part 72 of the sleeve 7. Even when the tightening is released, the watertightness between the inner circumferential surface of the enlarged diameter portion 40 of the large diameter pipe 4 and the outer circumferential surface of the small diameter pipe 2 continues to be maintained. The small-diameter pipe 2 can be expanded and contracted while the O-ring 8 interposed in the joint prevents leakage of the chemical solution from the joint.

Therefore, according to the means of the present invention, the O-ring 8 interposed in the joint part prevents leakage of the chemical solution when the length of the spray rod is adjusted by loosening the binding of the joint part.
By serving as a ring, it is possible to reduce the number of parts and accurately prevent leakage of the chemical solution when the joint portion of the spray rod is loosened, without increasing costs.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a manual spray rod, Fig. 2 is a longitudinal cross-sectional side view of the locking device for extending and retracting the manual spray rod according to the present invention, Fig. 3 is an exploded longitudinal cross-sectional view of the same as above, and Fig. 4 is the same as above. FIG. 5 is a vertical sectional side view of the sleeve in the middle of assembly. Explanation of drawing symbols, A... Manual spray rod, 1...
Head, 2...pipe, 20...engaging flange, 3...
Handle portion, 4... pipe, 40... enlarged diameter part, 40a...
...Stepped part, 41...Threaded part, 5...Cap, 50
... Female thread, 51 ... Pressing part, 6 ... Kotsuku device, 7 ... Sleeve, 70 ... Proximal end, 71 ...
Flange part, 72...Tip part, 73...Slit, 8...
O-ring, 9...Patzking.

Claims (1)

[Scope of utility model registration request] The distal end of the large-diameter pipe 4 into which the base end of the small-diameter pipe 2 can be freely inserted and removed is formed into a bag-like enlarged part 40, and a threaded part 41 is formed on the outer peripheral surface of the enlarged part 40. The inner circumferential surface of the enlarged diameter section 40 and the small diameter pipe 2 are placed in the cylindrical cavity w formed between the inner circumferential surface of the enlarged diameter section 40 and the outer circumferential surface of the pipe 2. The proximal end 70 of the sleeve 7 is fitted with an O-ring 8 that maintains watertightness between the sleeve 7 and the outer peripheral surface, and has a tapered cone-shaped distal end 72 and a cut 73 along the axial direction. The cap 5 formed in the shape of a cap nut is placed over the tip 72 of the sleeve 7 and the outer periphery of the enlarged diameter portion 40 , and the threaded portion 41 on the outer periphery of the enlarged diameter portion 40 is inserted. Expansion/contraction in a manual spray rod having a ring-shaped pressing part 51 screwed into the cap 5 and having a ring-shaped pressing part 51 in pressure contact with the middle of the inclined surface of the cone-shaped tip part 72 of the sleeve 7 at the inner end of the lumen of the cap 5. In this locking device, the sleeve 7 is made of synthetic resin and is loosely fitted around the outer periphery of the pipe 2 whose inner diameter is small.
is formed into a cylindrical shape whose outer periphery fits tightly into the inner periphery of the enlarged diameter portion 40, and a flange portion 71 that abuts against the distal end surface of the enlarged diameter portion 40 is formed on the distal end side of the proximal end portion 70, In addition, the length from the flange 71 to the rear end surface of the proximal end 70 is such that the proximal end 70 is press-fitted into the enlarged diameter section 40 until the flange 71 abuts the distal end surface of the enlarged diameter section 40. In this case, the rear end surface of the proximal end portion 70 is set to a length that compresses the O-ring 8 and packing 9 interposed between the rear end surface and the step portion 40a on the inner end side of the enlarged diameter portion 40. , the small diameter pipe 2
A locking device for extension and contraction in a manual spraying rod, which is provided with a collar portion 20 whose outer diameter approximately corresponds to the inner diameter of the large-diameter pipe 4.