DE1144980B - Assembly pliers for expanding slotted piston rings - Google Patents

Description

The subject matter of the invention relates to hand-operated assembly pliers, hereinafter referred to as "expanding pliers" called, for spreading slotted piston rings.

There are devices for installing and removing protected piston rings are known, which consist of a One-armed hand lever with movable schuhförniigen brackets exist and when the Apply pressure to the ring ends using the hand lever. In this device, whose stop is rigid, is a return spring is not provided. But these devices have the disadvantage that they are only for Installation or removal of piston rings with larger diameters are applicable. There are also pliers known for spreading all types of piston rings, in which the two ring ends in each case one to the upper Free legs movably mounted spreading member used and pulled apart by these at the same time will. However, this tool has the disadvantage that the piston ring used in it has to be slipped over on the piston body can neither be inclined nor held horizontally, since it as a result of his Weight tends to tilt, so that the fitter is forced to hold the ring with his free hand.

In this design, it is also not very easy to place the two expansion members behind the piston ring ends to get. It is also possible to adjust the tool for the purpose of spreading Rings with different diameters are tricky and consist of a multitude of components Ratchet system with spring-loaded actuators or catches required what Firstly, it is costly and often functionally impaired due to soiling and is prone to failure.

Furthermore, a ring gripping device for piston rings is known in which piston ring ends of gripped a pair of jaws and pulled apart for the purpose of spreading.

However, this design has the disadvantage that it is only for a certain piston ring diameter and a certain ring size is set up and an expensive screw mechanism for locking the tool leg when moving or guiding the pliers has difficult assembly conditions.

Furthermore, the spring attached to the two handles can pop off when the pliers are operated and cause injuries to the fitter's eyes, hands and face.

Finally, a piston ring assembly tool in the form of pliers has become known, which is used as assembly pliers
for expanding slotted piston rings

Applicant:

Anton Messerklinger,
Frankfurt / M., Extended Kleyerstrasse

Anton Messerklinger, Frankfurt / M.,
has been named as the inventor

so the most essential feature on the outermost free leg ends has claws for gripping the two ring ends of the piston ring for the purpose of spreading them apart.
During the spreading process, the ring ends are picked up on both sides by roller-like receiving devices and partially supported.

An adjustment device consisting of an adjusting screw and a fixed stop enables the recording or spread in the diameter of different piston rings. The handles of the assembly tool are held apart by spring force. The tool is relatively difficult to use, since it is only for the present purpose, such as to accommodate rings with large or small diameter or wider or narrower piston rings - by changing the appropriate ones Components - that must be prepared.

As a result, it is expensive and prone to failure and for a frequently changing use, for example Difficult to use in repair shops.

The object of the invention is to be, with one and the same pliers without additional adjustment of the Forceps to spread small piston rings and spread large piston rings wide.

The invention is based on known assembly pliers

for spreading slotted piston rings, the gripper of which pulls the piston ring through the slot there is a cross-over hook from the inside and a support fixed to this hook, on which the respective piston ring end overlapping the hook is supported on its outer circumference,

309 538/224

wherein the spread of the working legs is limited by a stop.

The solution to the problem is that each of the grippers can be pivoted with a sufficiently large Swivel radius at the end of the associated. Working leg of the pliers is arranged so that the connection line between the pivot point and the support point of the piston ring circumference the outside in the working position of the pliers in

executed recess the piston ring also shown in section is pressed in,

Fig. 4 the view against the gripper 4 'in the direction of the arrow in Fig. 2,

Fig. 5 the view of the expanding pliers according to Fig. 2 for piston rings of larger dimensions.

The method of operation of the subject matter of the invention is described below:

The expanding pliers essentially consist of one

essentially in the direction of the connecting line between 10 double lever pair with preferably U-shaped transverse the pliers leg pivot point and the cut where the two legs 1 and Γ with Pivot point of the gripper is. their bearing reinforcement mesh and - how

The one for achieving the intended effect with a pair of scissors or pliers - in common essential features are: a gripper, which are mounted from leg pivot point 2 and at the same time to one of the slit of the piston ring reaching through 15 handles 14 and 14 'shaped lower ends

and hooks encompassing the interior of the piston ring as well as a support firmly connected to the respective hook for the outer circumference of the piston ring consists, each of these grippers pivotable with a sufficient pivot radius at the end of the associated Working leg of the pliers is arranged so that the connecting line between the pivot point and the support point of the piston ring circumference in the working position of the pliers essentially

be spread apart by means of a spring 3, so that the tool opens when the lower leg ends are pressed together and when released closes by spring force. A stop cam is located on the inside of each handle 11 and 11 ' 12.12 '. To fully expand the inserted piston ring, both handles must 14 and 14 'absolutely until the two stop cams 12 and 12' meet.

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be pressed in the direction of the connecting line between the »5. Pliers leg pivot point and the pivoting To the upper free ends of legs 1 and 1 '

point of the gripper. The two grippers 4 and 4 'in the pivot points 5 must also be a stop to limit the spreading movement of the pliers and 5 'movably or pivotably articulated. the thighs be present. Grippers also have a U-shaped cross-section

The 3 £> is under the working position of the pliers and enclose with their cheek parts to understand the bearing position in which the pliers after the eyes 6 and 6 'at the upper ends of the legs 1,

1'. The grippers are in the rest position of the pliers with fl d

Insertion into the slot is spread so far that the Piston ring ends have come to rest between the hooks and the supports before spreading of the piston ring begins.

Under the essentially coincident connecting lines is to be understood here that the lines are approximately in the middle of each other is given, however, particularly when using very small and very large piston rings, swiveling these lines should be possible to one side or the other.

With regard to the effect, the inventor d Gi h i

their back surfaces 6 and 7 'against each other. Both grippers are inclined at their upper end with a upwardly pointing angular support trough 8 or 8 'provided at their angled execution Inner walls place the lower two outer edges of the piston ring 9 to be expanded in each case.

On the upper part of the back surfaces 7 and 7 'of the grippers 4 and 4' are the hooks 10 and 10 ', which capture the two ends of the cut or slotted piston ring 9 and this at

object that the gripper is initially in compression of the handles 14, 14 'and thus when follow the different curvature different 45 divergence of the grippers 4 and 4 'depending on the borrowed large piston rings in the initial position in the pressure exerted more or less different from each other Let waving to the working position of the spread. At the same time, the two end assembly pliers to adjust. This different zones of the piston ring 9 from the lower edges of the position of the gripper is favored by the two hooks 10, 10 'and as a result of the with piston rings of different diameters spreading 5 °, the lever forces that occur are usually pulled apart resulting different radial gene, but at the same time also firmly in the support troughs 8,

8 'pressed, with the points P, P' (Fig. 2) migrating a certain distance downwards, and whereby the tension within the piston ring 9 is distributed over almost its entire circumference.

Each gripper is provided with an end wall 11 or 11 'for the support trough 8, 8', which at the same time Slipping of the piston ring ends, especially when the piston rings are cut open at an angle

Fig. 2 prevent the upper part of the pair of legs of the 60 and are to be assembled. Spreader pliers in an enlarged side view (opposite the two ends of these piston rings lie down

Fig. 1) with the articulated moving parts, in this case with their pointed Stiralichen Spread apart grippers, with their edges against the support troughs 8, 8 'facing help a just captured by the tick of the gripper th end walls 11,11 ', of which they are equally smaller Piston ring (only partially drawn here) 65 sam as if pushed apart by front plates will be spread apart.

Fig. 3 a section in the direction AB through the So that the grippers 4, 4 'each on the through

right gripper, in whose angled cross-section the spring force-assisted return of the spreader

Thickness of the piston ring. The V-shaped design of the support recess acts in the same way.

The tool according to the invention is represented by FIGS. 1 to 5, and it means

Fig. 1 the view of the expanding pliers for piston rings of smaller dimensions in the non-actuated state, with the two grippers on the head of the pliers with their back parts against each other,

To be able to set the tool in the starting position, the back surfaces 7 or T of both grippers 4, 4 'must be extended "downwards" beyond the pivot points 5, 5'.

To limit a possible tilting movement of the grippers 4, 4 'outwards, a web 13, 13 '(Fig. 2,4) attached so that when closing the gripper can be automatically reset to the parallel position.

The essential parts of the subject matter of the invention must be coordinated with one another in such a way that they are arranged in a certain distance from each other, because this is not just for the operation of the tool itself is indispensable, but also above all for the possibility of one Safe and risk-free spreading of piston rings with any diameter.

The respective distances are as follows:

1. From the edge of the gripper device 4 or 4 'to the center of the pivot point 5 or 5'.

2. From the center of pivot point 5 to the center of pivot point 5 '.

3. From the middle of the pivot points 5, 5 'to the middle of the leg pivot point 2.

4. From the center of the leg pivot point 2 to the center of the stop cams 12 or 12 ', clearance between the Stop cams 12, 12 '.

5. From the inside edge to the inside edge when the assembly pliers are in the rest position.

When handling the expanding tool, for example When dismantling a piston ring, the operator first turns the ring in the ring grooves of the piston seated piston ring with the slit opening towards you and then hold it with one hand the plunger at its back. At the same time, he presses from behind against the one to be removed Piston ring, both ends of which protrude a little more towards the front of the piston ring groove. He then takes the tool with the other hand and grips the two with its two ticks Piston ring ends, while at the same time he presses the two handles together until they stop. By the effect of the double lever on the tool, the piston ring is opened so far that it can be effortlessly removed from the tool Piston can be stripped or raised.

The technical advantages of the assembly pliers according to the invention are as follows: Simple, clear Construction with few components, some of which are the same for both halves of the pliers; therefore low manufacturing costs. Large area of action; it includes, for example, a pliers with a total length of 270 mm all piston ring diameters in the range from 90 to 210 mm.

Reliable and safe detection of the piston ring.

Accident-free and slip-proof holding of each captured piston ring.

No breakage due to over-tensioning the piston ring when spreading, as each piston ring only extends up to can spread to the respective spread or assembly width.

Favorable distribution of tensile and compressive forces when expanding the piston rings, as these are caused by both the special lever arrangement of the tool system as well as the design of the gripper devices not only in the ring zone opposite the two ring ends, but approximately over the entire ring rounding can be distributed.

Elimination of an adjustable limiting device for the different spread widths of the tool, because the pliers for all possible ring diameters, without the risk of breakage for the Rings, until the cam stop (limitation of the lever path) must be actuated.

Claims (6)

PATENT CLAIMS: 1. Assembly pliers for spreading slotted piston rings, the gripper of which consists of a hook that crosses the piston ring from the inside through the slot and a support fixed to this hook, on which the respective piston ring end crosses the hook is supported on its outer circumference, the spread of the The working leg is limited by a stop, characterized in that each of the grippers (4, 4 ') is pivotably arranged with a sufficiently large pivot radius at the end of the associated working leg (1, V) of the pliers so that the connecting line between the pivot point (5, 5 ') and the support point of the piston ring circumference on the outside in the working position of the pliers is essentially in the direction of the connecting line between the pliers leg pivot point (2) and the pivot point (5, 5') of the gripper. 2. Assembly pliers according to claim 1, characterized in that the support for the outside of the piston ring (9) is designed as a V-shaped support recess (8, 8 ') opening towards the piston ring is. 3. Assembly pliers according to claims 1 and 2, characterized in that the support trough (8, 8 ') is designed as a straight trough so long that rings are both small and large diameter come to rest in it. 4. Assembly pliers according to claims 1 to 3, characterized in that the inner backs (7, T) of the two grippers (4, 4 ') are aligned and arranged in the closed position of the working legs (1, V) of the pliers that they lie flat against each other. 5. Assembly pliers according to claims 1 to 4, characterized in that one on the pliers Spring (3) is arranged, which causes the pliers to close. 6. Assembly pliers according to claims 1 to 5, characterized in that limit stops (13,13 ') for the pivoting movement of the Grippers (4, 4 ') are provided inwardly and outwardly opposite the respective working man (1, 1') are. Considered publications:
U.S. Patents Nos. 1,099,355, 1178,404,
392, 1616 621, 1691161. 1 sheet of drawings © 309 538/224 2.