JPS593814Y2 - Hydraulic operated extraction tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to extraction tools, and more particularly to power-operated extraction tools, such as hydraulic extraction tools.

Power-operated tools, such as hydraulic extraction tools, have been used successfully in the past for extracting force-fitted pins and the like.

A typical hydraulic extraction tool includes a housing defining an annular chamber having a hollow open center portion extending from end to end;
A piston mounted within the chamber has an end extending from the housing and having an opening in the end aligned with the hollow center of the housing.

Normally said housing is rigidly mounted in spaced relation to the pin to be extracted, and a bolt or the like is inserted into the hollow center of the housing through an opening in said piston end. , the head of the bolt abuts the end of the piston.

The bolt is threaded into a tapped hole formed in the pin to be extracted, and pressurized fluid is forced into the chamber to extend the piston from the housing, causing the bolt to extend the piston as described above. The connection to the pin allows the pin to be pulled out of the hole.

The extraction tool includes: (a) the length of the piston is of sufficient dimension to fully extract the pin from the hole in which the pin is force fit; and (b) the environment of use is such that the piston is If there is sufficient space for extension and withdrawal of the pin, it will work well to achieve its intended purpose.

However, if you are not in the above environment, other measures must be taken.

If, for example, the pin cannot be pulled out with a single movement of the extraction tool, it may be necessary to disassemble the device and reassemble it using shorter bolts.

In other cases, where there is sufficient room, after activating the tool once, a shim is inserted between the bolt head and the piston and the tool is activated again.

When using this method, the pin can eventually be pulled out of the hole in which it is press-fitted, but this process is time consuming and requires relatively close and difficult space. If necessary, the task of manually positioning the parts appropriately becomes very tedious.

The purpose of the present invention is to solve the above-mentioned problems.

According to one feature of the invention, there is provided an extraction tool comprising a first member and a second member, the members being interconnected and having a device for relative movement of the members between an extended position and a retracted position. A drawing tool is obtained which performs a relative movement at.

A tubular adapter is mounted to one of the members for rotation with respect to the other member, and the adapter has at least a partial internal thread.

A device is provided for inhibiting relative axial movement in at least one direction between the adapter and a member rotatably receiving the adapter, and wherein a rotational force is applied to either the adapter or the other member. Apparatus is provided adapted to receive the adapter and rotate the members relative to each other.

Another feature of the invention provides a method for extracting a tapped hole pin or the like in a confined space using a hydraulically actuated, extendable extraction tool, the tool being an end to end extraction tool. A method is obtained which has a hollow passageway extending into the hollow passageway and two members which are movable relative to each other.

The method includes inserting a rotatable sleeve having an internal thread and a radially extending stop flange into a passageway of a tool until the flange abuts one of the relatively movable members. There is.

a threaded stud is threaded onto the tapped pin and the internal thread of the sleeve to secure the other relatively movable member and to be axially spaced from the pin; .

Next, extend the tool.

Following extension of the tool, rotating the sleeve;
The stud is advanced into the internal thread and the tool is retracted.

These steps of extending the tool, rotating the sleeve, and retracting the tool are repeated until the pin is completely withdrawn.

Other objects and advantages of the present invention will become apparent from the embodiments described below with reference to the accompanying drawings.

1, 2 and 3 show the extraction tool according to the invention extracting a pin 10 which is press-fitted into a yoke 12 and supported by a bearing sleeve 14 of an assembly 16. has been done.

The pin has three parts with different diameters, namely the yoke 1
The smallest diameter portion 1 received within the hole 20 of one leg of 2
8, receiving the sleeve 14 and having a medium diameter portion 22 normally located between the legs of the yoke 12 and a maximum diameter portion 24 received within an aperture 26 in the other leg of the yoke 12.

The pin 10 also includes a radially extending tongue 28 through which the bolt 30 extends into the tapped hole 3 of the yoke 12.
2 and is adapted to securely hold the pin 10.

In normal cases, the largest diameter portion 24 and the smallest diameter portion 18
are each force fit within the holes 26,20.

Note that if the maximum diameter portion 24 comes out of the hole 26, the remaining portion 2
It can be seen that 0.22 can pass freely through hole 26.

As mentioned above, the extraction tool of the present invention is particularly designed to be used in a restricted space, but it can be equally effectively used in cases where limited space is not an issue.

To illustrate the use of the tool in the most difficult conditions, i.e. in restricted areas, the assembly 16 has a recess 34 for receiving one leg of the yoke 12, the recess being spaced apart from said leg. It is shown as having an end wall 36 located therein.

As seen in FIG. 1, the axial length of the largest diameter portion 24 is such that, until the extraction tool impinges on said wall 36, the maximum diameter portion 24 remains in the hole even when the extraction tool is extended to the left. The dimensions are such that it appears to have been completely pulled out.

With the above in mind, the details of this extraction tool will be explained next.

The extraction tool includes a housing having a tubular outer wall 38;
One end of the outer wall is a radially inwardly directed flange 40.

A peripheral sealing member 42 is disposed on the radially inner surface of this flange 40 for purposes described below.

A donut-shaped end wall 44 is provided at the opposite end of the outer wall 38.
is provided, the end wall being held in place by pins 46.

A seal member 48 provides a seal between the radially outer wall 38 and the end wall.

A tubular radially inner wall 50 is mounted in the central bore of the end wall 44 by suitable equipment and has a sealing member 52 at the interface of the inner wall.
is located.

A flange 40 on the radially outer wall 38 defines an end wall of the housing opposite the end walls, which end wall faces toward but does not extend to the radially inner wall 50. .

An annular piston 54 is disposed within the chamber defined by the end walls 40.44 and the inner and outer walls 50, 38.

The intermediate end of the piston 54 has an outer diameter smaller than the inner diameter of the radially outer wall 38 .

Piston 54 has a radially outwardly directed flange 56 at one end thereof, ie, the end adjacent between the walls, carrying a sealing member 58 in sealing engagement with outer wall 38.

The same end is also provided with a sealing member 60 which sealingly engages the inner wall 50.

The end of the piston 54 opposite the flange 56 is provided with a radially inwardly directed flange 62 which is aligned with the interior of the inner wall 50.

As can be seen, sealing member 42 sealingly engages piston 54.

The housing has ports 66, 68 on opposite sides of the piston flange 56 which open into the interior of the chamber.

Thus, when pressurized liquid enters port 66, piston 54 moves to the right until it reaches the position shown in FIG.

Conversely, if pressurized liquid flows into the port 68, the piston 54
moves to the left until it reaches the position shown in FIG.

In accordance with the present invention, a tubular adapter or sleeve 70 is inserted through the bore 64 of the piston flange 62 and the interior of the radially inner wall 50 of the housing.

The sleeve 70 is dimensioned to allow rotation relative to the piston 54 and the radially inner wall 50 of the housing.

The sleeve 70 has a radially outwardly extending stop member in the form of a flange 72 at one end thereof.

This flange 72 abuts a radially inward flange 62 on one end of the piston 54 so that the sleeve 70 moves to its left when the piston 54 is extended from the housing as shown in FIG. It looks like this.

This flange 72 thus has the effect of a shoulder and forms a device for preventing relative axial movement between the piston and the sleeve in at least one direction.

The end of the sleeve 70 remote from the flange 72 has internal threads 74 .

In the exemplary embodiment, the pin 10 has a tapped hole 76 and, in accordance with the present invention, a threaded stud 78 is screwed into the hole 76 and into the internal threads 74 of the sleeve 70.

Therefore, if piston 54 is moved to the left as shown in FIG. Partially withdrawn from 26.

To prevent such rightward movement of the housing, a stay 80, typically formed by a tube or short groove, is attached to the housing and to the portion that retains the pin, in this case the yoke 12. It is placed between the left leg.

In FIG. 2, the piston 54 has moved through its entire stroke, but the largest diameter portion 24 and the smallest diameter portion 18 of the pin 10 are still in their respective corresponding holes 26.20.
It has not been completely freed from the pressure-fitting.

At the same time, further leftward movement of the extraction tool is prevented by piston 5.
4 has already moved through its entire travel, or the wall 36 of the recess 34 prevents the pin 10 from moving completely.

Therefore, when using this tool, by releasing pressurized liquid at port 68 and applying liquid pressure to port 66, said piston 54 is retracted into the housing immediately after or as a result of this retraction. At the same time, the sleeve 70 is rotated.

The stud 78 therefore extends deep into this sleeve 70 until it reaches the position shown in FIG.

Pressurized liquid is then applied again to '068, causing the piston to extend again.

The components now have the dimensional relationships shown, such that in the extended position slightly less than the full stroke of the piston 54, the portions 18.24 are completely released from their respective press-fit positions in the bores 20.26. .

At this time, the stud 78 is pulled out from the tapped hole 76 and the component is disassembled.

If the recess 34 is too small to remove the stud 78, the piston 54 is retracted again and the sleeve 78 is removed.
0 to reduce the axial distance between the flange 72 of the sleeve 70 and the end of the pin 10 receiving the stud, allowing the stud to be removed from the hole 76.

In the working example described above, two extensions of the piston 54 were sufficient to completely free the pin 10, but in other cases the extension of the piston was followed by a retraction of the piston and the sleeve The step of rotating can be repeated as many times as necessary to withdraw the pin.

To facilitate rotation of the sleeve 70, the flange or scrap 72 is provided with a bolt head 82 as shown in FIG.
A wrench or the like may be applied to the portion to allow the sleeve 70 and the housing to move relative to each other.

If desired, the end face of flange 72 can be provided with one or more slots 84 to accommodate a screwdriver or the like when the extraction tool does not need to be used in a confined space. .

A slot 86 is formed on the left end surface of the stud 78 so that it can be accessed through the sleeve 70, and if the stud 78 becomes caught in the sleeve 70 due to the intrusion of a foreign object, the stud 78 can be removed with a screwdriver or the like. 78 and sleeve 70 can be designed to rotate relative to each other.

As is clear from the above description, the extraction tool according to the invention can be used very conveniently both in confined spaces and other locations.

The reason for this is that even if the pin cannot be pulled out in one direction, there is no need to disassemble the components.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the extraction tool according to the present invention, showing the arrangement when the pin extraction operation is to be started. FIG. 2 shows the next stage of the pin extraction operation, with the tool fully extended and the pin partially released. FIG. 3 is a view showing the stage of use of the tool prepared for extracting the pin, with the components shown in FIG. 2 being subjected to subsequent operations; FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. In the figure, 10 is a pin, 12 is a yoke, 14 is a sleeve, 16 is an assembly, 18 is a minimum diameter portion, 20 is a hole, 2
2 is an intermediate diameter portion, 24 is a maximum diameter portion, 26 is a hole, 2
8 is a tongue piece, 30 is a bolt, 32 is a tapped hole, 34 is a recess, 36 is an end wall, 38 is a radial outer wall, 40 is a flange,
42 is a sealing member, 44 is an end wall, 46 is a pin, 48 is a sealing member, 50 is a radially inner wall, 52 is a sealing member, 54 is a piston, 56 is a flange, 58.60 is a sealing member, 62
is a flange, 64 is a hole, 66.68 is a mouth, 70 is a sleeve, 72 is a flange, 74 is an inner hole, 76 is a tapped hole,
78 is a stud, 80 is a reserve, 82 is a bolt head, 84.
86 is a slot.

Claims (1)

[Claims of Utility Model Registration] A hydraulically operated extraction tool comprising: a tubular radially outer wall; a tubular radially inner wall; a first end wall connecting the inner wall and the outer wall at corresponding ends thereof; a second end wall located opposite the end wall and extending radially from one of said inner and outer walls toward, but not reaching, the other one; In a drawing tool having a chamber, the extraction tool is located in the chamber and the inner wall;
an annular piston slidably and sealingly engages an outer wall and a second end wall; a port located within the housing and in fluid communication with the chamber; and a tubular adapter sleeve carried by the piston. an adapter sleeve rotatable relative to the housing and having at least partially internal threads and axially aligned with the interior of the tubular inner wall; and a relative relationship between the piston and the adapter in at least one direction. a member formed on one of the adapter and the housing, the member being accessible from the outside of the housing and receiving a rotational force to cause the adapter and the housing to move relative to each other; a member for rotation, the blocking device comprising a radially outwardly extending shoulder formed on the adapter and adapted to engage a radially extending surface of the piston. the layer is located at one end of the adapter, and the member for rotating the adapter and the housing relative to each other comprises a member shaped like a bolt head formed on a radially outer surface of the layer, and The extraction tool wherein the member for rotating the adapter and housing relative to each other comprises a slot formed in the end of the adapter.