CN214980717U - Blind hole bush removing tool - Google Patents

Abstract

Blind hole bush removal tool includes: the main shaft comprises an outer end part and an opposite inner end part, wherein the inner end part is used for axially extending into the blind hole, a guide part distributed around the circumference of the main shaft is arranged at the inner end part, and the outline of the inner end part can be inserted into the lining; a shaft disposed through the shaft and including a proximal end projecting from the outer end of the shaft and an opposite distal end projecting at the inner end of the shaft, the shaft being axially fixed relative to the shaft and rotatable relative to the shaft; the clamping mechanism comprises a clamping pin rod which penetrates through the guide part, and the clamping pin rod can radially extend out of the periphery of the main shaft according to the rotation angle of the rotating shaft and is clamped in the bushing, so that the bushing can be driven to axially move relative to the blind hole along with the main shaft; and the transmission mechanism comprises a holding part fixed relative to the blind hole and an actuating part which is matched with the holding part and moves relative to the holding part to drive the main shaft to move relative to the blind hole in the axial direction. The utility model discloses allow to remove the bush under the prerequisite that damages little to the blind hole structure.

Description

Blind hole bush removing tool

Technical Field

The utility model relates to a hand tool's technical field specifically relates to aviation field spare part demolish device, more specifically relates to a demolish instrument that is used for bushing in the blind hole on the aircraft.

Background

In the field of modern civil aircraft, the movement mechanism is generally realized by matching a hole shaft when rotating. In special connection areas, such as areas where the main shaft is required to bear large loads or areas where the openness is limited and no through-holes can be made, the installation of the main shaft is often performed by installing bushings in the form of blind holes.

Typically, the bushing within the blind hole is self-contained with the bolt hole. The main shaft may be fixed to the body structure, for example, by bolts. This type of assembly is often found in the assembled relationship of landing gear assemblies of aircraft.

The inner bushing of the blind hole needs to be dismantled in the process of aircraft dismounting or operation maintenance.

For the dismounting of the blind hole bushing on the machine body, the blind hole is poor in openness, and only can enter from one end of the bushing. At present, no dismantling tool with strong applicability exists. For various sizes of blind bushing hole assemblies, the bushing in the blind hole is usually removed by destructive methods such as boring, hammering, etc. Not only does this operation directly result in the scrapping of the liner, but the violence of the operation often causes damage to the structure of the machine body. In addition, at present, for the removal of the blind hole bushing on the airplane, the blind hole bushing can be removed by adopting a boring way, a hole milling way and the like, but the removal way has higher requirement on an operation space and has overhigh cost for implementation on site.

In order to facilitate the removal of the bushing in the blind hole, the chinese patent application CN 104015159 a of the fifth, seventh and first factory of the chinese people liberation military discloses a special tool for the removal of the bearing bushing in the blind hole, which comprises a pull rod screw rod, a hook assembly, a hook mounting seat assembly, a supporting member, a pull rod and a handle. Although this specialized tool can realize accurate positioning and convenient operation is high-efficient for demolish bearing bush in the blind hole well, its mainly utilize the couple to catch on behind the blind hole neck bush bottom screw up the pull rod lead screw through the spiral and tightly catch on the bush with the couple, and then continue to screw up the pull rod lead screw and make the bush pull out.

The technical scheme proposed in the document needs to utilize a hinge mechanism to enable the hook component and the pull rod screw rod to be matched for use, and the structure is complex. And the tool has higher requirement on the residual quantity of the through hole in the blind hole in the use process, otherwise, a pull rod lead screw and a hook assembly in the tool cannot be completely placed at the bottom of the bushing.

A blind hole bush drawing device is disclosed in chinese utility model patent CN 206048078U of limited responsibility company of the Chengdu aircraft industry (group). The device comprises a tensioning nut, a pull rod, a sleeve and a fastening bolt. The upper end of the pull rod penetrates through the sleeve to be connected with the nut, the lower part of the pull rod is a forked drawing section, and the end head of the pull rod is provided with a step protruding outwards. The device uses the tensioning nut to tighten up the lower end of the pull rod in a screw feeding mode, and the purpose of pulling out the bush without damaging the base hole is skillfully realized.

In this patent, the pulling structure, which is bifurcated by the lower end of the pull rod, allows it to catch on the bottom of the blind bushing when it is placed in the bottom of the bushing. Thus, if the removal is suspended and the tool is removed in a special situation during the removal process, the tool cannot be removed from the bushing.

It follows that there is a need for a removal tool for non-destructive removal of a blind-hole inner bushing that overcomes the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

Based on the above-mentioned problem that exists among the prior art, the utility model aims at providing an application scope is wide, and is little to the damage of blind hole structure body, and allows the special demolition tool of the blind hole bush that removes during demolising, aims at solving the problem that current blind hole neck bush does not have suitable specialized tool to demolish.

Therefore, the utility model provides a blind hole bush demolishs instrument, include:

a main shaft comprising an outer end and an inner end opposite to the outer end and intended to project axially into a blind hole, the outer peripheral profile of the inner end being insertable into a bush to be removed;

a rotating shaft disposed through the main shaft, the rotating shaft including a proximal end protruding from the outer end of the main shaft and a distal end opposite the proximal end and protruding at the inner end of the main shaft, the rotating shaft being fixed in the axial direction relative to the main shaft and being rotatable relative to the main shaft;

the clamping mechanism comprises a clamping pin rod arranged at the inner end part of the main shaft, and the clamping pin rod can radially extend out of the periphery of the main shaft according to the rotation angle of the rotating shaft and is clamped in the bushing, so that the bushing can be driven to axially move relative to the blind hole along with the main shaft; and

the transmission mechanism comprises a holding part fixed relative to the blind hole and an actuating part which is matched with the holding part and moves relative to the holding part to drive the spindle to move relative to the blind hole in the axial direction.

Through the cooperation of screens mechanism and bush, according to the utility model discloses a blind hole bush demolition tool can remove the bush from the blind hole under the prerequisite that hardly or not harm blind hole structure and/or bush structure completely to allow to remove blind hole bush demolition tool from blind hole and bush at any moment during demolish.

According to the utility model discloses a blind hole bush demolition tool's preferred embodiment, interior tip department is equipped with around two guide portions that the main shaft is relative in footpath, and screens pin rod includes that the collineation is arranged and is passed two screens pin rods that guide portion set up.

The screens pin rod and the guide portion of collineation arrangement allow the existing pinhole of bush in the make full use of blind hole, thereby make according to the utility model discloses a blind hole bush demolishs instrument can be applicable to current blind hole bush subassembly better.

According to a preferred embodiment of the blind hole bush removal tool of the present invention, the holder comprises a support including a receiving end in the form of an opening, which engages with an outer surface of the open end of the blind hole and is arranged radially outside the open end, for receiving the removed bush in an inner cavity of the support, and a transmission end provided with a hole for the spindle to pass through;

the actuating part comprises a nut which is arranged outside the support seat against the transmission end,

wherein the spindle includes a lead screw section and the lead screw section cooperates with the nut.

The drive mechanism formed by the lead screw and nut mechanism is favorable for axial arrangement, is more suitable for matching with the structures of the main shaft and the rotating shaft, and is also suitable for receiving the detached bushing.

According to the utility model discloses a blind hole bush demolishs instrument's preferred embodiment, the main shaft be provided with the scale on the terminal surface of outer tip, in order to indicate the pivot for the rotation angle of main shaft.

The end face of the outer end part of the main shaft is provided with scales, so that the rotating angle and/or the current angle of the rotating shaft can be conveniently indicated, and the possibility of reflecting the position of the clamping pin rod is provided.

According to the utility model discloses a blind hole bush demolishs instrument's preferred embodiment, screens mechanism still includes the cam, the cam is in distal end department set firmly in the pivot and follow the pivot together for the main shaft rotates, screens pin lever with the cam cooperation.

The utility model discloses a cam mechanism, the usability is wide and be applicable to multiple specification bush. The extension amount of the clamping pin rod is accurately controlled by the cam mechanism, so that the bolt hole of the blind hole bushing is clamped.

According to the utility model discloses a blind hole bush demolishs instrument's preferred embodiment, the main shaft interior tip department has set firmly the backing pin, the backing pin with the cam cooperation is used for the restriction the rotation range of cam.

The provision of the catch pin prevents the cam from rotating to an undesirable position, thereby providing guidance to the proper operation of the operator.

According to the utility model discloses a blind hole bush demolition tool's preferred embodiment, the main shaft interior tip is equipped with and holds the chamber, the cam setting is in hold the intracavity, the screens pin rod passes the pin rod hole setting in the perisporium that holds the chamber.

The arrangement of the receiving space on the one hand permits relatively independent space for the cam and the detent pin lever, and on the other hand also offers the possibility of guiding the detent pin lever.

According to the utility model discloses a blind hole bush demolition tool's preferred embodiment, it is open cavity and has the opening to hold the chamber, be equipped with the apron on the opening, in order to cover the opening.

The open chamber that holds is convenient for assemble and maintain, and the setting of opening upper cover plate can shield and hold the chamber, prevents that debris from falling into and holds in the chamber.

According to the utility model discloses a blind hole bush demolition tool's preferred embodiment, the screens pin rod with cam complex serves and is provided with the boss, the boss with hold the relative one side of inner wall in chamber with it is provided with compression spring to hold between the inner wall in chamber, with through all the time with the screens pin rod pushes away to the cam and ensures the screens pin rod is followed the cam removes.

The compression spring provides elastic force for keeping the screens pin pole to closely paste in the cam all the time to the setting of boss can keep compression spring on the one hand, can also provide the good joint of screens pin pole and cam on the one hand.

According to the utility model discloses a blind hole bush demolishs instrument's preferred embodiment, the pivot be equipped with on the proximal end and be horizontal to the handle that the axis of pivot set up.

The provision of the handle facilitates accurate handling of the spindle and facilitates maintaining the spindle rotationally fixed relative to the spindle as desired during operation.

To sum up, the utility model discloses a blind hole bush demolition tool's beneficial effect lies in at least, through cam mechanism control screens pin rod, but accurate control screens pin rod elongation to the bush bolt hole is blocked to the accuracy, and operation process can take out blind hole bush demolition tool at any time, can not appear blind hole bush demolition tool and put into the problem that can't take out after, extensive applicability and easy operation. The advantages of the present invention are embodied in the following aspects:

1) the body parts are not damaged.

Different from the prior art, the utility model discloses a screens pin rod can demolish the bush from the blind hole with even atress after blocking the bolt hole of blind hole bush, can accomplish not harm any part.

2) Is not influenced by the operation space.

When the bushing is permanently installed on the blind hole of the airplane, the bushing cannot be removed by boring holes, only one side of the blind hole bushing on the airplane body can be accessed, the operation space is limited, and the common bilateral bushing removing method cannot be operated. Adopt the utility model discloses only need to put into the bush with blind hole bush demolishment tool, turning handle makes the screens round pin block bush bolt hole again, and the nut of screwing up on the support can evenly the application of force demolish the bush again easily, and easy operation is convenient.

3) Is not limited by the specification of the parts.

For a traditional boring method for removing the bushing, boring needs to place a part on a machining platform, and milling cannot be carried out if the part cannot be placed normally due to the influence of the shape. The utility model is internally detached from the bushing, so that the bushing is not limited by the shape of the part.

4) Wide application range and convenient operation.

To the bush of different wall thicknesses, different diameters, different bolt holes, the utility model discloses screens pin rod protrusion is adjusted to the accessible, demolishs different specification bushes, and operation process can suspend the instrument of taking out at any time moreover, does not have the instrument and puts into the problem just can't take out.

It is to be understood that both the foregoing general description and the following detailed description illustrate various embodiments and are intended to provide an overview or framework for understanding the nature and character of the claimed subject matter.

This document includes the accompanying drawings to provide a further understanding of various embodiments. The accompanying drawings are incorporated in and constitute a part of this specification. The drawings illustrate various embodiments described herein, and together with the description serve to explain the principles and operations of the claimed subject matter.

Drawings

With reference to the above purposes, the technical features of the invention are hereinafter clearly described, and the advantages thereof are apparent from the following detailed description with reference to the accompanying drawings, which illustrate, by way of example, a preferred embodiment of the invention, without limiting its scope.

In the drawings:

fig. 1 is an exploded perspective view of a blind bushing removal tool according to a preferred embodiment of the present invention.

Fig. 2 is a perspective cross-sectional view of the blind bushing removal tool according to a preferred embodiment of the present invention shown in fig. 1 during actual use.

Fig. 3 is a cross-sectional view of the perspective cross-sectional view shown in fig. 2 taken along the center axis of the blind bushing removal tool.

Fig. 4 is a view of a blind bore liner removal tool according to a preferred embodiment of the present invention, as viewed from its end projecting into the blind bore.

Fig. 5 is a perspective view of a blind bushing removal tool according to a preferred embodiment of the present invention, showing the end opposite to the end shown in fig. 4.

List of reference numerals

100 blind hole bush removing tool

110 spindle

111 outer end part

112 inner end portion

113 pin hole

114 cover plate

120 rotating shaft

121 proximal end

122 distal end portion

123 handle

131 position-locking pin rod

132 cam

133 stop pin

134 compression spring

141 support

142 nut

200 blind hole

300 liner

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below.

While the present invention will be described in conjunction with the exemplary embodiments, it will be appreciated that this description is not intended to limit the invention to those embodiments illustrated. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention.

For convenience in explanation and accurate definition of the technical solutions of the present invention, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments with reference to the positions of these features as shown in the figures.

Referring first to fig. 1, a blind bore liner removal tool 100 according to a preferred embodiment of the present invention includes: the main shaft 110, the rotating shaft 120, the clamping mechanism and the transmission mechanism.

Referring to fig. 2 to 5, the main shaft 110 of the blind bush removal tool 100 includes an outer end portion 111 (right-side end portion in fig. 1) and an inner end portion 112 (left-side end portion in fig. 1) opposite to the outer end portion 111 and adapted to project into the blind hole 200 in the axial direction.

In a preferred embodiment, a scale may be provided on an end surface of the outer end portion 111 of the main shaft 110 to indicate a rotation angle of the rotating shaft 120 with respect to the main shaft 110. For example, the scale may be arranged around the axis of the spindle 110 to cooperate with the mark on the shaft 120 to indicate the current rotation angle of the shaft 120, and one skilled in the art can design the status information of the locking mechanism indicated by the rotation angle of the shaft 120 according to actual requirements. The above-mentioned marks are, for example, indication lines provided at the respective ends of the rotation shaft 120.

The peripheral profile of inner end 112 is insertable into a bushing 300 to be removed. Preferably, the outer circumferential profile of inner end 112 conforms to the inner profile of liner 300 to be removed, e.g., both are circular profiles, and the outer circumferential profile of inner end 112 is slightly smaller than the inner profile of liner 300, such that the outer circumferential profile of inner end 112 can be inserted substantially snugly into the inner profile of liner 300 to be removed.

Referring to fig. 1 to 3, it can be seen that the rotation shaft 120 is disposed through the main shaft 110. The shaft 120 includes a proximal end 121 (right end in fig. 3) protruding from the outer end 111 of the main shaft 110 and a distal end 122 (left end in fig. 3) opposite the proximal end 121 and protruding at the inner end 112 of the main shaft 110. The rotating shaft 120 is fixed in the axial direction with respect to the main shaft 110 and is capable of rotating with respect to the main shaft 110. The axially fixed and rotationally free mounting can be done in a manner common in the art, such as providing a flange at the end of the shaft 120, etc., and will not be described further herein.

To more conveniently rotate the shaft 120 relative to the main shaft 110, the proximal end 121 of the shaft 120 may preferably be provided with a handle 123 disposed transverse to the axis of the shaft 120. More preferably, the handle 123 is inserted into a handle hole formed at the proximal end 121 of the shaft 120, so that different types of handles can be selected according to actual situations, or the handle 123 can be removed when the handle 123 is not needed.

The detent mechanism is described below with reference to the drawings. The retaining mechanism of the blind bush removing tool 100 according to the present invention includes a retaining pin rod 131 provided at the inner end portion 112 of the main shaft 110. The detent mechanism is configured to allow the bushing 300 to be moved by the spindle 110. Specifically, the detent pin 131 can radially extend out of the periphery of the main shaft 110 according to the rotation angle of the rotating shaft 120 and be snapped into the bushing 300, so that the bushing 300 can be driven to axially move with the main shaft 110 relative to the blind hole 200.

In order to enable the detent pin 131 to protrude out of the main shaft 110, preferably, as in the preferred embodiment shown in the figures, two guide portions radially opposite around the main shaft 110 may be provided at the inner end portion 112 to accommodate the two detent pin 131 arranged collinearly and disposed through the guide portions. In the preferred embodiment shown in the figures, the number of guides is two and the two guides are distributed at 180 ° from each other on the circumference of the main shaft 110. In this case, as can be seen in the drawing, the two detent pin rods 131 are arranged with their line direction substantially coaxial with the direction of the bolt hole axis of the blind hole bush.

It is noted that although the preferred embodiment of the present invention is directed specifically to a blind hole bushing 300 that is secured using pins, it will be appreciated by those skilled in the art that other arrangements of mounting holes formed in the peripheral wall of the bushing 300 may well be required when securing the blind hole bushing 300 using other securing means than pins. At this time, the position and number of the guide portions may be adjusted as appropriate according to actual needs to be adapted to the mounting configuration for the bush 300 itself. For example, two, three, four or more mounting holes distributed uniformly or non-uniformly in the circumferential direction.

The projecting blocking pin 131 serves to align and block the wall of the aforementioned mounting hole of the bush 300 to be removed, allowing the bush 300 to be carried along with the blocking pin 131 and thus the spindle 110 in an axial movement.

The detent mechanism may also include a cam 132. The cam 132 may be fixedly secured to the shaft 120 at the distal end 122 for rotation with the shaft 120 relative to the shaft 110.

For example, as in the preferred embodiment shown in the figures, the cam 132 may have a fixation hole formed therein and may be secured axially, even rotationally, by fasteners such as screws mounted to the distal end 122 of the shaft 120. For ease of assembly, a spacer may also be provided between the screw and the cam.

Also as in the preferred embodiment shown in the figures, for secure fixation of the cam 132 relative to the shaft 120 in the direction of rotation, the distal end 122 of the shaft 120 may be in the form of a square shaft, cooperating through the square shaft and a square hole in the cam 132.

The detent pin 131 cooperates with the cam 132. For example, the detent pin 131 may be in the form of a cam follower. More specifically, one end of the catching pin lever 131 contacting the cam 132 may be provided with a rounded portion (see the drawings) or a roller (not shown in the drawings).

Thus, the operator can rotate the rotating shaft 120 to drive the cam 132, and the cam 132 pushes the detent pin 131 to move. It is to be noted that although in the preferred embodiment shown in the figures, the blocking pins 131 are positioned perpendicularly to the axis of rotation of the disc cam, the skilled person can also choose a moving cam or a cylindrical cam, depending on the actual requirements.

A stopper pin 133 is fixedly provided at the inner end 112 of the main shaft 110, and the stopper pin 133 cooperates with the cam 132 to limit the rotation range of the cam 132. Although the preferred embodiment shown in the drawings includes only one stop pin 133, those skilled in the art may also provide two stop pins 133 to further limit the rotation range of the cam 132 according to the actual limit requirement. The above-mentioned rotation range can be generally designed such that the detent pin 131 does not protrude too far into the hole wall of the blind hole 200.

The catch 133 may be integrally formed with the main shaft 110 or may be detachably fixed at the inner end 112 of the main shaft 110 by a fastening means. In the latter case, one or more stop pin mounting portions may be provided at the inner end 112 of the main shaft 110 to selectively mount one or more stop pins 133 therein as desired.

In the preferred embodiment of the present invention shown in the drawings, the inner end 112 of the main shaft 110 may be provided with a receiving cavity. The receiving chamber may be obtained, for example, by removing a central portion of the inner end 112 of the main shaft 110, in which case the receiving chamber may be in the form of an open, substantially hollow cylinder and thus have an opening. Accordingly, the aforementioned cam 132 may be disposed within the accommodation chamber, and the detent pin 131 may be disposed through the pin hole 113 in the peripheral wall of the accommodation chamber. As can be seen, a cover plate 114 may be further provided over the opening of the receiving chamber to cover the opening, thereby separating the interior space of the receiving chamber from the exterior space. The cover plate 114 may be fastened to the end of the receiving cavity, for example, by conventional fasteners. More specifically, as shown in fig. 1, the cover plate 114 and the corresponding position of the receiving cavity are provided with screw holes to receive fasteners such as screws.

In the preferred embodiment shown in the drawings, the detent pin lever 131 may be provided with a boss on one end that engages with the cam 132. More specifically, a compression spring 134 is provided between the side of the boss opposite to the inner wall of the accommodating chamber and the inner wall of the accommodating chamber to ensure that the catching pin 131 lever follows the cam 132 by always urging the catching pin lever 131 toward the cam 132. The compression spring 134 may be a coil spring installed around the outer circumference of the detent pin rod 131. According to the preferred embodiment, a compression spring 134 is respectively sleeved on each of the detent pins 131, and the compression spring 134 is always in a compressed state, and the detent pins 131 are in close contact with the cam 132 at any time due to the spring force.

If the cam 132 rotates to push the blocking pin rod 131 to move outwards, the blocking pin rod 131 extends out at the moment; when the cam 132 is rotated in the opposite direction, the detent pin 131 is held in close contact with the cam 132 by the spring force and is retracted into the receiving cavity.

It will be appreciated by those skilled in the art that the other side of the boss may directly contact the cam 132, in which case the side thereof contacting the cam 132 may be provided with a rounded shape, and the side opposite to the interior of the receiving cavity may have a substantially flat shape to better accommodate the compression spring 134.

The transmission mechanism is described below with reference to the drawings. The utility model discloses a blind hole bush demolition tool's drive mechanism includes for the fixed holding portion of blind hole 200 and with the holding portion cooperation and for the holding portion motion and drive main shaft 110 in the axial for the portion of actuating of blind hole 200 motion.

In the preferred embodiment shown in the drawings, the holder may include a seat 141. More specifically, the seat 141 may include a receiving end and a driving end.

See, for example, fig. 1, where it can be seen that the receiving end is in the form of an opening. In other words, the seat 141 is a hollow member with a central portion removed, at least at the receiving end. The receiving end engages the outer surface of the open end of the blind bore 200 and is disposed radially outwardly of the open end to receive the removed bushing 300 in the interior cavity of the carrier 141. More specifically, considering that the bushing 300 removed in the example is cylindrical, the internal profile of the seat 141 is also circular. It is noted that the receiving end primarily serves to fix the axial position of the seat 141 relative to the blind bore 200 and does not necessarily have to be in complete close contact with the outer surface of the open end of the blind bore 200. In the preferred embodiment shown in the drawings, the outer surface of the open end of the blind bore 200 is planar with the mating surface of the receiving end.

The driving end is provided with a hole through which the main shaft 110 passes. In the preferred embodiment shown in the drawings, the bore of the driving end and the opening of the receiving end may have coincident axes.

The actuation part comprises a nut 142, which nut 142 is arranged outside the seat 141 against the transmission end, and the spindle 110 comprises a lead screw section and the lead screw section cooperates with the nut 142. It will be appreciated by those skilled in the art that the spindle 110 passing through the drive end moves axially as the nut 142 rotates relative to the seat 141 while maintaining the axial position due to abutment with the drive end.

To facilitate assembly, a spacer may be provided between the seat 141 and the nut 142.

The above-mentioned seat 141, washer, nut 142, screw section of the spindle 110 cooperate with each other. When the spindle 110 is fixed relative to the bushing 300 by means of the detent pin 131, the nut 142 is screwed onto the spindle section until it abuts against the abutment 141. In this case, continued tightening of the nut 142 causes the spindle 110 to move axially and internally entrain the bushing 300 via the detent pin 131 to pull it out.

The preferred use of the blind bush removal tool according to the present invention is described below in connection with the preferred embodiment thereof shown in the accompanying drawings.

1) The combination blind bushing removal tool 100.

The shaft 120 is passed through the main shaft 110 and the cam 132 is fixed at the distal end 122 of the shaft 120. This may be accomplished by specifically fastening the cam 132 and the shaft 120 together with a washer and a screw, and/or by a positive fit of the cam 132 to the shaft 120 (i.e., the aforementioned square shaft and square hole) to prevent the cam 132 from coming out in the axial direction and to prevent the cam 132 from rotating relative to the shaft 120. Next, the catch pin 133 is installed in the receiving cavity of the main shaft 110 for restricting the rotational position of the cam 132. The compression spring 134 is respectively sleeved on each of the detent pins 131, and the detent pins 131 sleeved with the compression spring 134 are installed in the receiving cavity of the main shaft 110. The cover plate 114 is coupled to the main shaft 110 by screws. Then, the support 141, the washer, and the nut 142 are respectively fitted around the outside of the screw section of the spindle 110. Finally, a handle 123 is mounted to the proximal end 121 of the shaft 120.

2) A blind bushing removal tool 100 is prepared.

The handle 123 is rotated to align the indicating line of the rotating shaft 120 with the zero position of the end face scale of the main shaft 110, so as to ensure that each of the locking pin rods 131 is approximately flush with the periphery of the cavity of the main shaft 110. It is noted that although reference is made herein to a "zero position", this does not necessarily require that the scale on the spindle be marked with one or more zero positions, but that any suitable zero position may be selected by the person skilled in the art, depending on the actual requirements. Furthermore, the "flush" mentioned herein does not strictly require that the detent pin 131 extends right to the outer circumference of the main shaft 110, but only if the main shaft 110 does not interfere with the extension into the bushing 300. In other words, at this time, the detent pin 131 may also be slightly retracted into the outer circumference of the main shaft 110 while still being located in the guide portion of the main shaft 110 or slightly extended out of the outer circumference of the main shaft 110 without interfering with the inner wall of the bushing 300 in any direction.

3) The blind bushing removal tool 100 is snapped with respect to the bushing 300.

The rotating handle 123 drives the rotating shaft 120 to rotate in one direction. The shaft 120 thus rotates the cam 132. The cam 132 further drives the detent pin 131 to extend. When the rotation handle 123 rotates the rotation shaft 120 in the opposite direction, the protruding amount of the locking pin 131 is shortened by the elastic force of the compression spring 134. The indicating position of the indicating line on the rotating shaft 120 at the end face scale of the outer end part 111 of the main shaft 110 is adjusted by controlling the handle 123, and then the extending amount of the clamping pin rod 131 is controlled to enable the clamping pin rod to accurately clamp the bolt hole of the bushing 300 without entering the inner wall of the bolt hole of the blind hole 200.

4) The bushing 300 is removed from the blind hole 200.

The washer and seat 141 are pressed at the open end of the blind bore by tightening the nut 142. By continuing to screw the nut 142 to exert pressure on the seat 141, the detent pin 131 of the blind bore liner removal tool 100 causes the bushing 300 to move axially until the bushing 300 is completely removed from the blind bore 200.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims (10)

1. A blind bushing removal tool (100), comprising:

a main shaft (110), said main shaft (110) comprising an outer end (111) and an inner end (112) opposite to said outer end (111) and intended to project axially into a blind hole (200), the peripheral profile of said inner end (112) being insertable in a bush (300) to be removed;

a rotating shaft (120), the rotating shaft (120) being disposed through the main shaft (110), the rotating shaft (120) comprising a proximal end (121) protruding from the outer end (111) of the main shaft (110) and a distal end (122) opposite the proximal end (121) and protruding to the inner end (112) of the main shaft (110), the rotating shaft (120) being fixed in the axial direction with respect to the main shaft (110) and being rotatable with respect to the main shaft (110);

the clamping mechanism comprises a clamping pin rod (131) arranged at the inner end (112) of the main shaft (110), and the clamping pin rod (131) can radially extend out of the periphery of the main shaft (110) according to the rotation angle of the rotating shaft (120) and be clamped in the bushing (300), so that the bushing (300) can be driven to axially move relative to the blind hole (200) along with the main shaft (110); and

the transmission mechanism comprises a holding part fixed relative to the blind hole (200) and an actuating part which is matched with the holding part and moves relative to the holding part to drive the main shaft (110) to move relative to the blind hole (200) in the axial direction.

2. The blind bushing removal tool (100) of claim 1,

two guide portions radially opposed around the main shaft (110) are provided at the inner end portion (112), and the detent pin lever includes two detent pin levers (131) arranged collinearly and provided through the guide portions.

3. The blind bushing removal tool (100) of claim 1,

the holder comprises a seat (141), the seat (141) comprising a receiving end in the form of an opening, which engages with the outer surface of the open end of the blind hole (200) and is arranged radially outside the open end to receive a removed bushing (300) in the inner cavity of the seat (141), and a driving end provided with a hole for the spindle (110) to pass through;

the actuating part comprises a nut (142), the nut (142) is arranged outside the support (141) against the transmission end,

wherein the spindle (110) comprises a screw section and the screw section cooperates with the nut (142).

4. The blind bushing removal tool (100) according to claim 3,

scales are arranged on the end face of the outer end part (111) of the main shaft (110) to indicate the rotation angle of the rotating shaft (120) relative to the main shaft (110).

5. The blind bushing removal tool (100) of claim 1,

the detent mechanism further comprises a cam (132), the cam (132) being fixedly attached to the shaft (120) at the distal end (122) for rotation with the shaft (120) relative to the spindle (110), the detent pin (131) cooperating with the cam (132).

6. The blind bushing removal tool (100) of claim 5,

a stop pin (133) is fixedly arranged at the inner end (112) of the main shaft (110), and the stop pin (133) is matched with the cam (132) and used for limiting the rotation range of the cam (132).

7. The blind bushing removal tool (100) of claim 5,

the inner end portion (112) of the main shaft (110) is provided with an accommodation chamber in which the cam (132) is disposed, and the detent pin (131) is disposed through a pin rod hole (113) in a peripheral wall of the accommodation chamber.

8. The blind bushing removal tool (100) of claim 7,

the accommodating cavity is an open cavity and is provided with an opening, and a cover plate (114) is arranged on the opening to cover the opening.

9. The blind bushing removal tool (100) of claim 7,

screens pin pole (131) with cam (132) complex is served and is provided with the boss, the boss with hold the chamber the inner wall relative one side with hold and be provided with compression spring (134) between the inner wall in chamber to through all the time with screens pin pole (131) bulldoze to cam (132) and ensure that screens pin pole follows the cam moves.

10. The blind bushing removal tool (100) of claim 1,

the proximal end (121) of the rotating shaft (120) is provided with a handle (123) arranged transversely to the axis of the rotating shaft (120).

Images