JPS6344220Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a solder sucker that can suck and remove excess molten solder during soldering work, etc., has a long life, and can be manufactured at low cost. .

2. Description of the Related Art Conventionally, solder suckers having structures shown in FIGS. 1 to 3 are known. Reference numeral 1 in the figure indicates a cylinder, and the tip 1a of this cylinder 1
A hollow pointed solder suction port 2 is screwed into the .

This solder suction port 2 is molded from a heat-resistant material such as fluororesin, and has a suction hole 2a in the center.
is drilled.

A piston 4 having a rod 3 is slidably inserted into the cylinder 1.

This piston 4 is o-
It consists of a ring 5, a cylindrical support fitting 6 having a fitting groove 6a for supporting the O-ring 5, and a nut 7 for attaching the support fitting 6 to the piston rod 3.

The rod 3 is formed in such a length that its proximal end 3a protrudes outward from the cylinder 1, and its distal end 3b beyond the piston 4 can be inserted into the suction hole 2a of the solder suction port 2. The diameter has been reduced to

A spring (biasing member) 8 is interposed between the piston 4 and the solder suction port 2, and the spring 5 always biases the piston 4 toward the base end 1b of the cylinder 1. There is.

A cylindrical head 9 for operation is attached to the base end of the piston rod 3. By pressing this head body 9 with a finger, the spring 8
The piston 4 is slid toward the tip 1a of the cylinder 1 against the urging force of the cylinder 1. A locking recess 10 is formed in the piston rod 3 near the head body 9.

Further, a cylindrical body 11 is screwed onto the base end of the cylinder 1 . This cylindrical body 11 prevents the piston 4, which is biased by the spring 8, from protruding outward, and also locks the piston rod 3 when the piston 4 is located at the tip of the cylinder 1. It fulfills the role of

The cylindrical body 11 is formed in a cylindrical shape, and has a through hole 11a inside thereof for sliding the piston rod 3, and a locking member 12 that engages with the locking recess 10 of the piston rod 3 through the hole 11a. Hole 1
A fitting hole 11b is provided to accommodate the housing slidably in a direction perpendicular to 1a. The above locking member 1
The locking member 12 has a locking hole 1 in a direction perpendicular to its central axis.
3 is drilled. On the lower peripheral surface of this locking hole 13 is a raised strip 13 that locks into the locking recess 10.
a is formed. The locking member 12 is loosely fitted into the fitting hole 11b with the spring 14 first, and in this state the piston rod 3 passes through the through hole 11a and the locking hole 13.

In the above solder sucker, when the head body 9 is pushed toward the inside of the cylinder 1 with a finger, the piston 4
moves against the biasing force of the spring 8, the piston 4 is located near the tip of the cylinder 1, and the tip 3b of the piston rod 3 is connected to the suction hole 2 of the solder suction port 2.
a, the locking recess 10 of the piston rod 3 is located in the locking hole 13 of the locking member 12. As a result, the locking recess 10 of the piston rod 3 and the raised strip 13a of the locking hole 13 are engaged, and the piston rod 3 and piston 4 are fixed. In this state, the tip of the solder suction port 2 is brought into close contact with the molten solder, and the locking member 12 is pushed into the cylindrical body 11 against the biasing force of the spring 14. Then, the engagement between the locking recess 10 of the piston rod 3 and the raised strip 13a of the locking hole 13 is released, and the piston 4 is moved inside the cylinder 1 to the base end 1b of the cylinder 1 by the biasing force of the spring 8. Move toward the destination. As a result, a suction force is generated inside the cylinder 1, and the solder suction port 2
Molten solder is sucked in from the

By the way, the above-mentioned solder sucker has the following drawbacks, and a solution to these problems is desired.

That is, the molten solder sucked into the cylinder 1 solidifies in the cylinder 1 into various sizes,
A microscopic state is generated. Further, as the suction is repeated, in other words, as the piston 4 is reciprocated many times, some of the relatively large pieces of solder become fine. The fine solder generated in this way adheres to the lubricating oil that also serves as a seal on the surface of the O-ring 5 constituting the piston 4, and the fine solder located between the inner wall of the cylinder 1 and the O-ring 5 The suction force of the piston 4 decreases over time due to wear and other factors, which shortens the life of the solder sucker.

On the other hand, the clearance between the inner diameter of the cylinder 1 and the outer circumferential surface of the support fitting 6 (the front half of the support fitting 6) between the O-ring 5 and the nut 7 is narrowed to an extent that does not allow fine solder to pass through, and its precision is increased. It is possible to solve the above drawbacks. However, increasing the clearance accuracy in this way increases manufacturing costs and cannot be adopted.

This idea was made in view of the above circumstances,
The purpose is to provide a solder sucker with a long life and low manufacturing cost.A ring-shaped member (cleaning ring) that elastically slides against the inner peripheral surface of the cylinder on the piston rod on the solder suction port side of the piston. By installing this, it is possible to prevent fine solder from adhering to the piston without increasing the accuracy of the cylinder's inner diameter tolerance.

This invention will be explained below with reference to the drawings. Figure 4 shows the main part of an embodiment of this invention.
In the figure, parts common to those in FIG. 2 are given the same reference numerals to simplify the explanation. Reference numeral 20 in the figure indicates a cylindrical support fitting 20 attached to the piston rod 3 with a nut 7.
Fitting grooves 20a, 20b are provided along the outer circumferential surface of the
is engraved. The O-ring 5 is fitted into the fitting groove 20a, and the cleaning ring 21 is fitted into the fitting groove 20b.

This cleaning ring 21 is attached to the cylinder 1.
The O-ring 5 is in sliding contact with the inner circumferential surface of the O-ring 5, and serves to prevent fine solder existing at the tip of the cylinder 1 from transferring to the O-ring 5. This cleaning ring 21 is made of fluororesin. This is because the cleaning ring 21 may come into contact with molten solder, so it needs to be heat resistant, and since it will be in sliding contact with the inner circumferential surface of the cylinder 1, it should not be hard enough to avoid abrasion of the inner circumferential surface of the cylinder 1. This is because slipperiness is required. Therefore, the cleaning ring 21 may be made of other materials as long as they have heat resistance, hardness, and slipperiness comparable to those of fluororesin. This cleaning ring 21 is
As shown in FIG. 5, it is formed into a ring shape having a cut portion 21a. The reason why the cleaning ring 21 is formed into an open ring shape is to give the ring elasticity in the radial direction, so that even if the inner diameter tolerance of the cylinder 1 is somewhat large, the cleaning ring 21 and the cylinder 1 This is to maintain the clearance with the inner circumferential surface within a range that can prevent the passage of fine solder. Further, the cut portion 21a is formed obliquely with respect to the side surface of the cleaning ring 21. This is to prevent the gap formed in the cleaning ring 21 by the cut portion 21a from being parallel to the axial direction of the cylinder 1. The cleaning ring 21 has elasticity and serves to prevent fine solder from passing through the O-ring 5. In the above configuration, the support fitting 20, the nut 7, the o-ring 5, and the cleaning ring 21 constitute a piston 22.

However, in the solder sucker with the above configuration,
A cleaning ring 2 that slides into contact with the inner peripheral surface of the cylinder 1 near the tip of the cylinder 1 near the o-ring 5
1 is attached, fine solder existing at the tip of the cylinder 1 does not pass through the cleaning ring 21 and reach the O-ring 5. Therefore, no matter how many times the piston 22 is slid, fine solder does not adhere to the O-ring 5, and therefore the suction force generated by the movement of the piston 4 is not impaired over time, and it can be used for a long time. You can get longevity. Also, cleaning ring 2
Since the cylinder 1 has elastic force in the radial direction due to its structure, it is sufficient that the inner diameter tolerance of the cylinder 1 is the same as that of the conventional cylinder, and there is no need to worry about increasing manufacturing costs.

Note that the cleaning ring in this invention is not limited to the structure of the above embodiment,
Other shapes and materials may be used as long as they have the same effect. For example, a closed ring member having a somewhat smaller diameter than the cleaning ring 21 is formed from synthetic resin, elastic hair-like material is densely planted on the outer peripheral surface of the ring member, and this hair-like material is used as a cylinder. A structure that makes sliding contact with the inner circumferential surface is conceivable.

As explained above, the solder sucker according to this invention has a cleaning ring that slides in elastic contact with the inner peripheral surface of the cylinder on the piston rod on the solder suction port side of the piston, so that the inner diameter tolerance of the cylinder can be improved. Since it is possible to prevent fine solder from adhering to the piston without increasing the precision of the piston, it can have a long life and reduce manufacturing costs.

[Brief explanation of the drawing]

Figures 1 to 3 are for explaining a conventional solder sucker, where Figure 1 is a perspective view, Figure 2 is an exploded perspective view, Figure 3 is an exploded perspective view of the cylindrical body, and Figure 4. 5 are for explaining one embodiment of this invention, FIG. 4 is a perspective view of the main parts, and FIG. 5 is a perspective view of the cleaning ring. 1...Cylinder, 1a...Cylinder tip, 1
b...Base end of cylinder, 2...Solder suction port, 3
... Piston rod, 8 ... Spring (biasing member), 21 ... Cleaning ring, 22 ... Piston.

Claims (1)

[Scope of utility model registration request] a cylinder, a piston slidably inserted into the cylinder with its rod protruding outward from the proximal end of the cylinder, and a hollow pointed solder suction installed at the tip of the cylinder. and a biasing member provided between the solder suction port and the piston to bias the piston toward the base end of the cylinder, and the movement of the piston causes the cylinder to In a solder sucker that sucks up molten solder from the solder suction port into the cylinder by the suction force generated in the solder suction device, the piston rod on the solder suction port side near the piston slides into contact with the inner wall of the cylinder, and the fine solder inside the cylinder is removed. A solder sucker characterized by being equipped with a cleaning ring that prevents the solder from adhering to the piston.