JPS601985Y2 - Pliers for removing and removing piston rings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to pliers used for attaching and detaching a piston ring to a piston ring groove.

As shown in FIG. 1, in the past, a makeshift tool such as a screwdriver 3 was used to remove the piston ring 2 from the piston 1.

In this case, applying force with a screwdriver based on the lever principle will damage the main body of the piston, and if the piston is made of cast metal, the corners of the ring groove may be chipped.

Also, cast iron piston rings will break if they are widened too much.

Furthermore, there is a danger that the driver may slip and cut or hit your hand on the burrs or corners of the piston.

Also, when removing the piston ring using snap ring pliers 4, the tips of the pliers are thin and there is no catch, so when the piston ring is expanded, in most cases the pliers will come off and the piston will It is difficult to remove the ring, and there is a risk that the piston ring may come off the pliers during removal and installation.

The purpose of this invention is to solve these conventional problems.The purpose of this invention is to attach a slide claw with a protrusion to prevent it from coming off at the tip, a useful part, and a long hole to the grip of the pliers. The piston ring removal/removal pliers are adjustable in position and can be fixed with set screws, and particularly facilitate the installation/removal of small piston rings of about 20 to 150φ.

Next, the embodiment of this invention will be explained with reference to the drawings.
In the figures to FIG. 5, the pliers main body 10 is
A spring 13 is clamped between a pair of levers 12 which are pivotally connected to each other, and urges the levers 12 outward. I'm pushing towards it.

Therefore, when the lever 12 is gripped against the spring 13 and moved in the direction of the arrow, the tip of the grip 14 opens, and when released, it closes.

As shown in FIG. 4, both gripping portions 14 have screw holes 16 for attaching slide claws 15, which will be described later.

The slide claw 15 has a long hole 17 drilled in the longitudinal direction for attachment to the grip part of the pliers body, and a hook protruding outward at the tip, that is, a retaining protrusion 18, and a retaining protrusion 18. Continuing from this, a stepped portion 19 is provided toward the outside.

Here, the outer side refers to the side opposite to the inner side, which is the side where both the gripping parts 14 come into contact.

The slide claw 15 passes through the elongated hole 17 and is fixed to the grip portion 14 by a set screw 20 screwed into the screw hole 16.

The mounting position of the slide claw 15, and thus the amount of protrusion of the slide claw 15 from the gripping portion 14, can be adjusted as desired by shifting the slide claw along the elongated hole and fixing it with the setscrew 20.

The tip portion 21 of the slide claw 15, that is, the portion between the retaining projection 18 and the stepped portion 19, needs to be made of a material that is hard to bend and hard to break.

Further, the grip portion 14 of the main body 10 is made longer so that the slide claw 15 can be freely adjusted and attached.

To remove a piston ring using the desorption pliers of this invention, as shown in FIGS. hold.

Then, the retaining protrusion 18 comes into contact with the inner diameter surface of the piston ring, and as shown in FIG. It can be easily removed because it is supported by and spread out.

Conversely, to insert the piston ring into the ring groove of the piston, as shown in Figure 6, hook both ends of the piston ring to the outside of the tip of the slide claw, spread them out, and engage them with the ring groove.
When you release your grip on the lever, the tip of the slide claw closes and the piston ring returns to its original shape and is installed, so all you have to do is pull out the pliers.

As described above, this invention includes a retaining protrusion 18 and a stepped portion 19 on the outside of the tip of the slide claw that grips the piston ring.
Since the hook is provided with a hook, the piston ring will not slip and fall off even if the slide claws are extended to push and support the piston ring, making it easy to attach and detach.

In addition, since there is no need to apply excessive force as with a screwdriver, there is no need to damage the piston body or damage the piston ring when attaching and detaching.

In addition, conventionally, two people were required to use three or four screwdrivers, but with this invention, it is only necessary to hold the lever with one hand, so one person can easily install and remove the device.

Also, since there is a hook, the piston ring will not come off and pop out when it is installed or removed.

Furthermore, since the piston rings are supported by sliding claws, it is possible to attach and detach piston rings of various sizes.

That is, when the piston ring diameters are different, the slide claw 15
This can be done by changing the mounting position of the grip part 14 using the elongated hole 17.

Generally, the amount of movement of the lever 12 is naturally limited by the size of the pliers body 10, but this invention uses the length of the lever to adjust the distance from the fulcrum 11 of the body to the tip of the slide claw 15. By adjusting the relationship between the amount of movement and the amount of opening of the tip of the slide claw, it is possible to respond to changes in the size of the piston ring.

Furthermore, when the slide pawl becomes worn or damaged, it can be easily replaced with a spare slide pawl, so tool costs can be reduced, and many other excellent effects can be achieved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the conventional piston ring removal method, Figure 2
The figure is a plan view of an embodiment of this invention, Figure 3 is a side view of Figure 2 seen from below, Figure 4 is a plane view of the grip part of the pliers body, and Figure 5 is an enlarged view of the slide claw. Fig. 6 is a plan view, the opening is a side view, and Fig. 6 is an enlarged view of main parts showing how the piston ring is gripped. 10...Pliers body, 12...Lever, 13...Spring, 14...
Gripping part, 15...Sliding claw, 16...
・Screw hole, 17...Elongated hole, 18...Preventing protrusion, 19...Stepped part, 20...
- Set screw.

Claims (1)

[Scope of utility model registration request] The grip part of the pliers body has a threaded hole for attaching a sliding pawl to the grip part of the main body, and the outside tip has a protrusion to prevent it from coming off, followed by a useful part. Pliers for removing and removing piston rings, which have a pair of sliding claws having elongated holes in the longitudinal direction, and are adjustable and fixed to the threaded holes of the gripping part by means of set screws.