JP3638890B2 - Pin operation machine and pin attachment / detachment attachment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pin operating machine and a pin attachment / detachment attachment that are suitable for a connection / removal operation of a connecting pin performed when assembling or disassembling a long attachment of a working machine.
[0002]
[Prior art]
Conventionally, in a building demolition work, a demolition machine equipped with a crusher at the tip of a long attachment is used.
[0003]
Currently, this type of dismantling machine is known to have an ultra-long attachment that reaches a height of 43m above ground, but further increases in the length of the attachment are being considered as the building becomes taller.
[0004]
Such a large dismantling machine is normally carried into the site with the crawler, attachment, and counterweight removed from the dismantling machine body and assembled on site. 9 and 10 show the assembling procedure.
[0005]
First, the crawler 70a is attached to the dismantling machine body 70, and the counterweight 72 is attached to the upper swing body 71 (see FIG. 9A).
[0006]
Next, the proximal second boom 73b and the proximal third boom 73c that are connected in advance to the distal end of the proximal first boom 73a connected to the floor plate of the upper swing body 71 via a boom foot pin. Connect (see FIG. 9B).
[0007]
Similarly, the proximal fourth boom 73d is connected to the distal end of the proximal third boom 73c (see FIG. 9C).
[0008]
Further, the base end boom 73 is completed by connecting the base end fifth boom 73e to the tip of the base end fourth boom 73d.
[0009]
Next, the intermediate boom 74 is connected to the distal end of the proximal boom 73 (see FIG. 9D).
[0010]
The cylinder 74a of the intermediate boom 74 is reduced, and the intermediate boom 74 is bent downward (see FIG. 10E).
[0011]
Next, the upper turning body 71 is turned or retracted by raising the boom.
[0012]
The tip first boom 75a and the tip second boom 75b are placed on the ground, and the retracted intermediate boom 74 is returned and connected (see FIG. 10 (f)).
[0013]
Next, the rod point portion of the cylinder 75c provided on the first distal end boom 75a is connected to the intermediate boom 74 (see FIG. 10G).
[0014]
Next, the upper swing body 71 is swung or retracted by raising the boom, the tip third boom 75d and the fourth boom 76 connected in advance are placed on the ground and connected to the tip of the tip second boom 75b. (See FIG. 10 (h)).
[0015]
By the above assembly procedure, a two-fold long attachment is configured.
[0016]
Moreover, in the above-mentioned large dismantling machine, although a connection pin is inserted in each connection part of a long attachment (for example, refer FIG.9 (c)), those connection pins P are also 100-120 mm in diameter and large.
[0017]
[Problems to be solved by the invention]
Conventionally, when assembling an attachment, a plurality of workers hold the connecting pin P and carry it to the pin hole of the boom connecting portion. However, when the connecting pin becomes heavy, a plurality of hands are required. In addition, when the pin hole is high, a small crane is also required. For this reason, there is a problem that the connection pin is not easily transported.
[0018]
Moreover, although the operation | work which inserts a connection pin to a pin hole is performed by hit | damaging using a hammer, when a pin hole becomes a high place, the scaffold for an operator will be needed. In this way, when the worker who got on the scaffold hits the connecting pin lifted by a small crane with a hammer, there is a problem that not only workability is bad but also a lot of time is spent on assembly of the attachment. .
[0019]
The present invention was made in consideration of the problems in the conventional long attachment assembly as described above, and does not require a manpower or a scaffold, and can easily move the connecting pin to the pin hole of the boom connecting portion. In addition, the present invention provides a pin operating machine and a pin detachment attachment that can hit the connecting pin in the horizontal direction and drive it to the insertion completion position.
[0020]
[Means for Solving the Problems]
Pin Operation machine of the present invention, the pin for connecting the structures together, a insert against the pin hole provided on the structure or sampling lupine operation mechanical, self-propelled base machine A pin gripping means capable of gripping / releasing the pin and a pin striking means for striking the pin in the axial direction are arranged in parallel at the tip of the undulating and bending work arm supported by the arm. The gist of the invention is that the pin is inserted into the pin hole by means, and the pin is driven to the insertion completion position by the working arm and the pin striking means, or extracted from the insertion completion position .
[0021]
According to this pin operating machine, a heavy pin can be gripped and moved to a pin hole of an arbitrary height.
[0022]
Moreover, for drawing by pin implanted an inserted pin hole to the insertion completion position by a pin striking means, or striking the pins that are inserted into the pin insertion hole, also pin holes a high place The pin can be easily driven and the pin can be easily extracted from the pin hole.
[0023]
The pin gripping means can be composed of an arm opening / closing device that opens and closes a pair of arms. Further, the hitting means can be constituted by a piston / cylinder device that hits a hitting rod that can be engaged coaxially with a pin with a piston.
[0024]
Further, as the hitting rod, there can be provided an insertion rod for driving the pin to the insertion completion position, and an extraction rod that can penetrate the pin hole and extract the pin inserted into the pin hole by hitting.
[0025]
Preferably, the piston / cylinder device is fixed to a working arm , and the arm opening / closing device is fixed to an outer wall of a cylindrical case provided around the piston / cylinder device. According to this configuration, since the pin striking force does not directly act on the arm opening / closing device, the reliability of the arm opening / closing device can be improved.
[0026]
Also, if a case rotation mechanism for rotating the cylindrical case around its cylinder axis is provided so that the arm opening and closing device can be rotated, the arm opening and closing device can be rotated and retracted when the pin is hit. Even if it is a low position from the ground, a pin can be hit reliably.
[0027]
As above Symbol self Hashishiki base machine, it is possible to use a construction machine such as a hydraulic excavator having a lower traveling body and pivotally mounted on the upper rotating body to the vertical axis around on its lower traveling body travels.
[0028]
Moreover, the pin attachment / detachment attachment of the present invention is a pin attachment / detachment attachment that is attached to a working arm that can be raised and lowered in a construction machine via a bracket, and can hold and release a pin that connects structures together. A pin gripping means and a pin striking means for striking the pin in the axial direction are provided side by side. The pin is inserted into the pin hole by the work arm and the pin gripping means, and the work arm and the pin striking means driving pins to the insertion completion position, or the gist that it has been configured to withdraw from the insertion completion position.
[0029]
According to this pin attachment / detachment attachment, the present invention can be mounted as an optional device on a work arm of an existing construction machine.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
[0031]
FIG. 1 shows a pin operating machine 1 according to the present invention.
[0032]
The main body 2 of the pin operating machine 1 shown in the figure is obtained by removing a bucket from a small hydraulic excavator called a so-called mini excavator, and an upper swing body 5 is rotatably mounted on a lower traveling body 4 on which a crawler 3 is mounted. It functions as a self-propelled base machine.
[0033]
In front of the driver's seat 6 in the upper swing body 5, a working arm 7 is provided as a pin operating means for performing ups and downs and bending operations. The working arm 7 is connected to the boom 8 and the tip of the boom 8. And an arm 9 that rotates.
[0034]
A base end portion 8 a of the boom 8 is connected to a boom mounting portion 10 a of a swing bracket portion 10 extending from the floor plate of the upper swing body 5 via a boom foot pin 11.
[0035]
Accordingly, the work arm 7 having this configuration can move up and down by expansion and contraction of the boom cylinder 12, and can swing by a predetermined angle in the vehicle body width direction by expansion and contraction of a swing cylinder (not shown). The arm 9 is rotated in the front-rear direction of the shovel by the expansion and contraction of the arm cylinder 13.
[0036]
Reference numeral 14 denotes a pin attachment / detachment attached to the tip of the arm 9.
[0037]
This pin attachment / detachment attachment (hereinafter abbreviated as “attachment”) 14 includes a bracket 15 for connecting to the arm top portion 9 a, a piston / cylinder device 16 as a striking means provided on the bracket 15, and a bracket 15. It is mainly comprised from the arm opening / closing apparatus 17 as a pin holding means provided.
[0038]
The attachment 14 can move in the range of Hmin to Hmax in the vertical direction while maintaining the posture of hitting in the horizontal direction.
[0039]
FIG. 2 is an enlarged longitudinal sectional view showing the attachment 14.
[0040]
In the figure, a bracket 15 connected to the arm top portion 9a has a rectangular substrate 15a. Vertical plates 15b and 15b are parallelly extended from the substrate 15a, and horizontal plates 15c and 15d are also extended in parallel. As a box (see FIG. 3).
[0041]
The vertical plates 15b and 15b are respectively provided with a link pin hole 15e for connecting the link 18 installed on the arm 9 with a pin and a connection pin hole 15f for connecting with the arm top portion 9a with a pin. Yes.
[0042]
A cylinder tube of a cylinder 22 to be described later is fixed to the horizontal plate 15c.
[0043]
A rotating shaft 19 is disposed in the horizontal direction on the substrate 15 a, and an arm 20 is fixed to the rear end portion of the rotating shaft 19 in the diameter direction of the rotating shaft 19.
[0044]
As shown in FIG. 3, the arm 20 is connected to the rod of the cylinder 22 through a pin 21. Thereby, when the rod of the cylinder 22 is extended, the arm 20 is pushed down, and the rotating shaft 19 is rotated by 90 ° in the direction of arrow A.
[0045]
As shown in FIG. 2, a boss portion 23a having a swing arm 23 is fitted to the front end portion of the rotating shaft 19, and the boss portion 23a and the rotating shaft 19 are fixed by being provided with a key groove 23b. ing.
[0046]
Further, a U-shaped notch 23a is formed at the tip of the swing arm 23, and a pin 25 protruding from the rotating ring 24 is engaged with the notch 23a.
[0047]
As shown in FIG. 2, a cylindrical case 26 having a notch is fixed to the rotating ring 24. Therefore, when the cylinder 22 is extended, the rotary shaft 19 is rotated by 90 ° through the arm 20, and the swing arm 23 fixed to the rotary shaft 19 is also rotated by 90 °. As a result, the cylindrical case 26 is moved to the cylindrical shaft. Is rotated by 90 ° in the direction of arrow A around the center.
[0048]
Reference numeral 27 denotes a bearing device that rotates about the rotation shaft 19. The outer ring of the bearing device 27 is connected to the cylindrical case 26. The inner ring is supported by a disk 28 fixed to the bracket 15 in a state of facing the substrate 15a. In addition, 27a is a bearing which is interposed between the outer ring and the inner ring and rolls. Reference numeral 28a denotes a cylindrical connection plate that connects the disk 28 and the substrate 15a. However, the swinging range of the swinging arm 23 in the connection plate 28 a is notched so as not to contact the swinging arm 23.
[0049]
An arm opening / closing device 17 is attached to the outer peripheral surface of the cylindrical case 26 that can rotate.
[0050]
As shown in FIG. 4, the arm opening / closing device 17 has a mounting bracket 30 fixed downward on the outer wall of the cylindrical case 26, and arms 33 and 34 are attached to the mounting bracket 30 via pins 31 and 32. Yes.
[0051]
One arm 34 has a protrusion 34a formed above the pin 32 mounting position, and a rod 35a of a cylinder 35 is connected to the protrusion 34a. The head side end of the cylinder 35 is supported by another mounting bracket 36 that hangs down from the outer wall of the cylindrical case 26.
[0052]
A link 37 is connected to the arm 33 and 34 near the pin 32 mounting position so that the arms 33 and 34 are interlocked.
[0053]
Accordingly, when the rod of the cylinder 35 is reduced, the projecting portion 34a moves in the direction of arrow B with the pin 32 as a fulcrum, and the arm 34 moves from the position indicated by the solid line to the position indicated by the two-dot chain line and is opened. At this time, the link point of the arm 34 connected by the link 37 moves from 37a to 37b, so that the arm 33 is also opened in conjunction. Note that the pin gripping operation of the arms 33 and 34 is performed by the reverse operation to that described above.
[0054]
Further, the distal end portion 33a of the arm 33 and the distal end portion 34a of the arm 34 are each cut into a V shape so that the pin P having a circular cross section can be securely gripped.
[0055]
Next, returning to FIG. 2, the configuration of the piston / cylinder device 16 will be described.
[0056]
Each base end portion of a pair of support members 41 and 42 (only the back side support member 41 is shown) for supporting the piston / cylinder device 16 is fixed to the disk 28 described above. , 42 are connected to each other using pins 43 and 44 so that they are shaped and reinforced.
[0057]
Attachment portions 45 and 46 of the piston / cylinder device 16 are fixed to the support members 41 and 42 using bolts and nuts.
[0058]
The main body of the piston / cylinder device 16 uses a known hydraulic breaker, and its principle is shown in FIG.
[0059]
In the figure, C1 indicates a nitrogen gas sealing chamber above the piston, C2 indicates a chamber above the middle piston stage, C3 indicates a chamber below the piston suspension, and C4 indicates a chamber at the main valve step.
[0060]
(a) Piston retreating stroke In FIG. 6 (a), when an operation valve (not shown) is opened, pressure oil is supplied from the pipe line "IN", and hydraulic pressure acts on the rear end of the chamber C3 and the plunger 40a, and the main valve 40b Pressed against the plate 40c. As a result, the pressure oil is used only for the retraction of the piston 40d, and retreats against the pressure of the nitrogen gas. At this time, the pressure oil in the room C2 is discharged from the pipe line "OUT".
[0061]
(b) Backward stroke of main valve In FIG. 5B, when the piston 40d moves backward and the chamber C3 and the pipe line L3 communicate with each other, the pressure oil flows into the chamber C4. Since the cross-sectional area of the room C4 is larger than that of the plunger 40a, the main valve 40b starts to move backward. Thereby, the insertion rod 54 and the piston 40d are separated.
[0062]
(c) Stroke stroke In FIG. 6 (c), when the main valve 40b retreats and the pipe line L1 and the pipe line L6 communicate with each other, the piston 40d starts to advance with the pressure of nitrogen gas. At this time, the pipe line "IN" Is cut off from the pipe L1 while communicating with the pipe L2. As long as the pipe line L3 is blocked by the piston 40d, the pressure oil is supplied to the chamber C4. Therefore, the main valve 40b is kept retracted and the pressure oil in the chamber C3 is discharged smoothly.
[0063]
The pressure oil discharged from the room C3 flows from the pipe L1 → the pipe L6 → the pipe L4 → the room C2, that is, the pressure oil discharged from the room C3 is absorbed by the room C2, and the piston 40d can hit the insertion rod 54 without receiving a load.
[0064]
(d) Main valve advance stroke When the piston 40d advances and the pipe line L3 communicates with the room C2, the pressure oil in the room C4 is discharged from the pipe line "OUT", and the main valve 40b is pressed by the plunger 40a. Thus, the piston retreat stroke starts again.
[0065]
In addition, the broken line in the drawing represents the insertion rod 54 that has been moved by striking the piston 40d.
[0066]
Further, as shown in FIG. 2, the insertion rod 54 is mounted so as to penetrate through a holder 52 and a bush 53 provided at the tip of the piston / cylinder device 16. An engaging recess 54a for engaging the end of the pin P is formed at the tip of the pin.
[0067]
The insertion rod 54 described above is used for striking when a pin is inserted, and can be removed from the holder 52 by removing the retainer pin 55a attached to the holder 52 as shown in FIG. In addition, 55b is a stopper washer, and 55c is a spring pin.
[0068]
If the extraction rod 56 is attached instead of the removed insertion rod 54, the pin inserted into the connecting portion of the boom can be extracted while striking. Therefore, the shaft length L of the sampling rod 56 is set longer than the pin hole length of the connecting portion. An engaging recess 56 a that can engage with the end of the pin P is also formed at the tip of the extraction rod 56.
[0069]
Reference numeral 54b (or 56b) denotes a concave groove that functions as a stopper. When the insertion rod 54 reciprocates, the retainer pin 55a abuts on either the end face 54c or 54d of the concave groove 54b. The stroke of the service rod 54 is regulated.
[0070]
Next, the operation of the pin operating machine having the above configuration will be described with reference to FIGS.
[0071]
FIG. 7 shows a procedure when the pin P is inserted into a pin hole provided in a connecting portion of a boom as a structure.
[0072]
In FIG. 9A, reference numeral 60 denotes a boom section of the dismantling machine shown in FIG. In inserting the pin P into the pin hole 60 a, first, the end on the opposite side to the insertion side of the pin P placed on the sleeper 61 is gripped by the pair of arms 33 and 34 of the arm opening / closing device 17.
[0073]
Next, by operating the work arm 7, as shown in FIG. 7B, the pin P is lifted while maintaining a horizontal posture, and the insertion side end of the pin P is inserted into the pin hole 60a. At this time, the pin P is inserted to such a depth that the pin P does not fall out of the pin hole 60a.
[0074]
Next, the arms 33 and 34 are separated from the pin P, and as shown in FIG. 7C, the insertion rod 54 of the piston / cylinder device 16 is moved to the pin position. At this time, by rotating the cylindrical case 26 by 90 °, the arms 33 and 34 of the arm opening / closing device 17 are retracted so as not to contact the ground.
[0075]
In this state, the piston / cylinder device 16 is driven to strike the pin P in the direction of arrow D.
[0076]
FIG. 7D shows a state where the pin P has been driven to the insertion completion position.
[0077]
Thus, the boom is connected by driving the pin P into the pin hole 60a of the boom 60.
[0078]
When the pin P is inserted into the pin hole, the vertical positioning can be performed by raising / lowering the work arm 7, and the horizontal positioning is performed by swinging the work arm 7 in the vehicle width direction by a swing cylinder. It can be carried out. Moreover, when inserting a pin in another boom connection part, a construction machine is self-propelled.
[0079]
Next, a pin extracting operation when the boom 60 is disassembled will be described with reference to FIG.
[0080]
First, the insertion rod 54 is replaced with the extraction rod 56.
[0081]
Next, the pin operating machine is moved to the side opposite to the pin driving side, and the extraction rod 56 is fitted to the end of the pin P to be extracted.
[0082]
In this state, the piston / cylinder device 16 is driven to hit the pin P in the direction of arrow E.
[0083]
By operating the work arm 7, the extraction rod 56 is moved in the direction of arrow E in accordance with the pin P to be extracted. Thereby, the extraction rod 56 passes through the pin hole 60 a and the pin P is removed from the boom 60.
[0084]
As described above, if the attachment 14 can be attached to and detached from the arm in the same manner as an optional device such as a crusher or a hydraulic breaker, a construction machine equipped with a spare valve for the optional device as a standard machine can be used as a base machine. By using it, the attachment 14 can be operated without newly installing a hydraulic device.
[0085]
The pin operating machine of the present invention uses a construction machine equipped with a work arm as a self-propelled base machine in the above embodiment, but is not limited to this, and can move to the connecting portion of the structure itself, A self-propelled machine such as a forklift can be used as the base machine as long as the prepared pin can be gripped and moved to the pin hole of the connecting portion.
[0086]
Moreover, in the said embodiment, although the arms 33 and 34 of the arm opening / closing apparatus 17 were rotated 90 degrees using the cylinder 22, it is not restricted to this, For example, it is also comprised so that it may rotate 360 degrees using a hydraulic motor. it can. Thereby, the operativity in pin attachment / detachment operation can be improved.
[0087]
【The invention's effect】
As described above, according to the present invention, the pin gripping means capable of gripping / releasing the pin and the pin are hit in the axial direction at the tip of a working arm that is supported by a self-propelled base machine that can be raised and lowered. A pin striking means is juxtaposed, the pin is inserted into the pin hole by the working arm and the pin gripping means, and the pin is driven to the insertion completion position by the working arm and the pin striking means, or the insertion is completed. Since it is configured to be extracted from the position , the pin which is a heavy object can be gripped and moved to a pin hole of an arbitrary height, and the connecting operation can be performed easily and in a short time.
[0088]
Also, driving the inserted pin pin hole to the insertion completion position by a pin striking means, or order to that sampling by striking pins that are inserted into the pin insertion hole, the pin hole was at height However, the pin can be easily driven, and the pin can be easily extracted from the pin hole.
[0089]
According to inventions of claims 2, it is possible to grip or release the pin with a simple structure for opening and closing the pair of arms.
[0090]
According to inventions of claims 3, by preparing a blow rod to be attached to the grip portion of the pin, the striking device body can be constructed from an existing piston-cylinder device, such as a hydraulic hammer.
[0091]
According to inventions of claims 4, an insertion rod for driving a pin to the insertion completion position, by replacing the sampling rod can penetrate the pin holes, both working pin insertion and pin extraction is You can do it.
[0092]
According to inventions of claims 5, a piston-cylinder device secured to the working arm, for fixing the arm opening and closing device on the outer wall of the cylindrical case disposed around the piston-cylinder device, the pin striking force directly, Since it does not act on the arm opening / closing device, the reliability of the arm opening / closing device can be improved.
[0093]
According to inventions of claims 6, due to the provision of a case rotating mechanism for rotating the cylindrical case around the cylinder axis, when the pin blow will be able to be retracted by rotating the arm switchgear, lower from the ground Even if it is a position, a pin can be hit reliably.
[0094]
According to inventions of claims 7, as a self Hashishiki base machine, a construction machine such as a hydraulic excavator, having a lower traveling body and pivotally mounted on the upper rotating body to the vertical axis about its undercarriage on the traveling Can be used .
[0095]
According to inventions of claims 8, it is possible to mount the present invention as an optional device to the working arm of an existing construction machine.
[Brief description of the drawings]
FIG. 1 is an external view of a pin operating machine according to the present invention.
FIG. 2 is an enlarged view of the pin attachment / detachment attachment shown in FIG.
FIG. 3 is an explanatory diagram for explaining a rotation operation of the arm opening / closing device shown in FIG. 1;
FIG. 4 is an enlarged view showing a configuration of an arm opening / closing device.
FIGS. 5A to 5D are explanatory views showing an operation principle of the piston / cylinder device shown in FIG. 1;
FIG. 6 is a perspective view for explaining a method of exchanging the pin insertion rod and the pin extraction rod.
FIGS. 7A to 7D are explanatory views for explaining a pin insertion operation.
FIGS. 8A and 8B are explanatory views for explaining a pin extracting operation. FIG.
FIGS. 9A to 9D are process diagrams illustrating a conventional boom assembling procedure.
FIGS. 10E to 10H are process diagrams illustrating a boom assembling procedure subsequent to FIG.
[Explanation of symbols]
P connecting pin 1 pin operating machine 2 self-propelled base machine 3 crawler 4 lower traveling body 5 upper turning body 7 working arm 8 boom 9 arm 12 boom cylinder 13 arm cylinder 14 attachment 15 bracket 16 piston / cylinder device 17 arm opening / closing device 18 Link 19 Rotating shaft 20 Arm 22 Cylinder 23 Swing arm 24 Rotating ring 26 Cylindrical case 27 Bearing device 33, 34 Arm 35 Cylinder 37 Link 54 Insertion rod 56 Extraction rod

Claims (8)

Pins for connecting the structures together, a the for the pin hole provided in the structure inserted or sampling lupine operation machine, universal undulations and bending is supported on a self-propelled base machine A pin gripping means capable of gripping / releasing the pin and a pin striking means for striking the pin in the axial direction are arranged in parallel at the tip of a work arm, and the pin is pinned by the work arm and the pin gripping means. was inserted into the hole, the pin operating machine, characterized in that it is configured to withdraw the pin driving to the insertion completion position, or from the insertion completed position by the working arm and the pin striking means. The pin operating machine according to claim 1, wherein an arm opening / closing device for opening / closing a pair of arms is provided as the pin gripping means . The pin striking means has a striking rod engageable with said pin and coaxial pins operating machine of the blow rod Ru claim 1 or 2, wherein Na from the piston-cylinder device for the striking piston. As the striking rod, there are an insertion rod for driving the pin to the insertion completion position, and an extraction rod that can penetrate the pin hole and extract the pin inserted into the pin hole by striking. The pin operating machine according to claim 3 . The piston-cylinder device is secured to the working arm, the pin operating machinery of the arm opening and closing device according to claim 3 or 4, wherein that is fixed to the outer wall of the cylindrical case disposed around the piston cylinder device. 6. The pin operating machine according to claim 5 , further comprising a case rotating mechanism for rotating the cylindrical case about its cylindrical axis, wherein the arm opening / closing device can be rotated . As the base machine, the undercarriage of the running, in any one of claims 1 to 6 the construction machine is used with the undercarriage on the pivotally mounted on the upper rotating body to the vertical axis around The pin operating machine described. A pin attachment / detachment attachment that is attached to a working arm that can be raised and lowered in a construction machine via a bracket. The pin holding means that can hold and release a pin that connects structures together, and the pin is hit in the axial direction. And a pin striking means to be inserted in parallel, the pin is inserted into the pin hole by the working arm and the pin gripping means, and the pin is driven to the insertion completion position by the working arm and the pin striking means, or the insertion A pin attachment / detachment attachment configured to be extracted from a completion position.

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