JP2018091090A - Attaching and detaching device of attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an attaching and detaching device of an attachment, with which an attachment pin is not released unintentionally during separation work of an attachment, in a simple and low-cost manner.SOLUTION: An attaching and detaching device 1 of an attachment comprises a fixing hook 3 that is provided on an arm connection part 2 connecting to an arm and that one pin of an attachment engages with, a movable hook 4 that is supported by the arm connection part 2 so as to linearly approach or separate from the fixing hook 3, and that the other pin of the attachment engages with, and a shutting hook 5 that is supported by the arm connection part 2 so as to swing in the movement direction of the movable hook 4 and that shuts or opens an opening edge 31 of the fixing hook 3. The movable hook 4 is provided with a cam groove 43, which consists of a linear groove 431 that extends in the movement direction and an oblique groove 432 that bends from an end on the fixing hook side of the linear groove 431. The shutting hook 5 is provided with an actuation pin 511 that engages with the cam groove 43.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an attachment attaching / detaching device interposed between an arm of a construction machine or a rod or link of an operation cylinder and an attachment.

  For the purpose of facilitating the replacement of the attachment, an attachment attaching / detaching device interposed between the arm of the construction machine or the rod or link of the operation cylinder and the attachment is used (for example, Patent Document 1). Patent Document 1 includes a fixed hook (first holding member) that engages and holds one pin (pin member) of an attachment, and a movable hook (second holding member) that engages and holds the other pin of the attachment. An attachment attaching / detaching device (attachment changing device) provided with an interval adjusting and holding mechanism for moving the movable hook is disclosed (Patent Literature 1 [Claim 1]).

  The distance adjustment holding mechanism is a screw rod provided with a lock member. The screw rod is attached to an arm attachment member provided with a fixing hook (Patent Document 1 [Claim 2]). In addition, the fixed hook and the movable hook have a configuration in which the opening edges (opening sides) of the respective hook-shaped holding portions are provided in opposite directions (opposite directions) (Patent Document 1 and [Claim 3]).

  The attachment attaching / detaching device disclosed in Patent Literature 1 facilitates attachment replacement work (Patent Literature 1, [0026]). Further, if the distance adjusting and holding mechanism is a screw rod, the attachment can be easily replaced by moving the movable hook (Patent Document 1, [0027]). Furthermore, if the opening edges of the fixed hook and the movable hook are provided in opposite directions (opposite directions), it is possible to reliably prevent the attachment pins from falling off (Patent Document 1, [0028]).

JP 07-305373 A

  In recent years, safety standards for attachment / detachment devices have been raised overseas, and it has been demanded that attachment pins are not unintentionally released from the attachment / detachment device during attachment separation work. From the viewpoint of this safety standard, the attachment attaching / detaching device disclosed in Patent Document 1 is in a state in which once the screw rod is loosened, the pin of the attachment is easily detached from either the fixed hook or the movable hook, and the separation work is in progress. The attachment pins may be unintentionally released from the attachment attachment / detachment device.

  From now on, with respect to the attachment attaching / detaching device disclosed in Patent Document 1, it is considered to provide a lock mechanism capable of independently controlling the holding and releasing of the pins of the attachment so that the locking mechanism is not released until the separation work is completed. Is done. However, it is not preferable to provide a lock mechanism that can be controlled independently, which complicates the attachment / detachment device, inconveniences handling and easily causes failure, and increases manufacturing costs. Therefore, in order to realize a simple and inexpensive attachment / detachment device in which attachment pins are not released unintentionally in the middle of attachment separation work, studies were made.

  The device developed as a result of the study is an attachment detachment device that is interposed between the arm of the construction machine and the rod or link of the operation cylinder and the attachment, and is provided at the arm connection part connected to the arm, and engages one pin of the attachment. A fixed hook to be supported, a movable hook that is linearly approached and separated from the fixed hook supported by the arm connecting portion, and a movable hook that is engaged with the other pin of the attachment, and swings in the moving direction of the movable hook supported by the arm connecting portion. And a closing hook for closing or opening the opening edge of the fixed hook, the movable hook being a cam groove comprising a straight groove extending in the moving direction and an oblique groove bent from an end of the straight groove closer to the fixed hook And the closing hook is provided with an operating pin that engages with the cam groove.

  The open edge of the fixed hook or the movable hook is an open part through which one or the other pin of the attachment passes in and out of the fixed hook or the movable hook. Both ends sandwiching the open edge are separated by more than the outer diameter of one or the other pin of the attachment. The closing hook closes the opening edge of the movable hook means that the opening edge is completely eliminated or the distance between one end of the opening edge and the end of the closing hook is the outer diameter of one or the other pin of the attachment. It means to be less than. The opening of the opening edge of the movable hook by the closing hook means that the distance between one end portion sandwiching the opening edge and the end portion of the closing hook is equal to or larger than the outer diameter of one or the other pin of the attachment.

  In the attachment attaching / detaching device of the present invention, the operating pin is engaged with the cam groove provided in the movable hook, and the opening edge of the fixed hook is closed or opened by the closing hook that swings according to the movement of the movable hook. The closing hook swings when the movable hook moves away from the fixed hook and engages the operating pin with the oblique groove of the cam groove, thereby opening the open edge of the fixed hook. One pin of the attachment can be hooked to a fixed hook with an open edge and is easily released. The closing hook swings when the movable hook approaches the fixed hook and engages the operating pin with the linear groove of the cam groove, and closes the open edge of the fixed hook. One pin of the attachment is not released if it is engaged with a fixed hook with the open edge closed.

  In the attachment attaching / detaching device of the present invention, as long as the operating pin is engaged with the straight groove of the cam groove, the closing hook keeps closing the open edge of the fixing hook, so that one pin of the attachment engaged with the fixing hook is not. It is not released freely. For this reason, as long as a fixed hook and a movable hook can hook the pin of an attachment, you may open each open edge in which direction. Here, if the fixed hook and the movable hook are opened in the direction in which the respective open edges move away from each other, the movable hook is moved away from the fixed hook with the attachment attached to the attachment detaching device, and the closing hook is swung. This makes it impossible to open the open edge of the fixed hook.

  The movable hook connects the other of the tube or the rod of the linear cylinder in which one of the tube or the rod is supported to the arm connecting portion, and approaches and separates from the fixed hook according to the expansion and contraction of the rod of the linear cylinder. In the present invention, since one pin of the attachment engaged with the fixed hook is restrained by the closing hook, it does not matter whether the linear motion cylinder has a lock mechanism. In addition, the movable hook is provided with a moving block that is screwed to the feed screw supported by the arm connecting portion, and moves toward and away from the fixed hook according to manual or automatic rotation of the feed screw. The feed screw and the moving block constitute a feed mechanism. In the present invention, since one pin of the attachment engaged with the fixed hook is restrained by the closing hook, it does not matter whether the feed screw has a lock mechanism or not, like the linear motion cylinder.

  The present invention achieves a simple and inexpensive attachment / detachment device in which attachment pins are not unintentionally released during attachment separation work. This is an effect of a configuration in which an operating pin is engaged with a cam groove provided in the movable hook, and an opening edge of the fixed hook is closed or opened by a closing hook that swings according to the position of the movable hook. The combination of the cam groove of the movable hook and the operating pin of the closing hook can be configured simply and inexpensively. For this reason, the malfunction of the closing hook is unlikely to occur, and the fixing hook reliably holds one pin of the attachment, and stabilizes the holding state.

  When the open edges of the fixed hook and the movable hook are opened in the direction away from each other, the movable hook is moved away from the fixed hook, and the closed hook is swung, so that the open edge of the fixed hook cannot be opened. This is an advantage that the attachment is not accidentally dropped from the attachment attaching / detaching device. Furthermore, after the movable hook is brought close to the fixed hook and the other pin of the attachment is released from the movable hook, the movable hook must be moved away from the fixed hook again, and even after the other pin of the attachment is released from the movable hook. The safety is ensured by the fixing hook continuing to hold one pin of the attachment.

  When the movable hook approaches and separates from the fixed hook using the linear cylinder as the moving means, the movable hook can quickly approach and separate from the fixed hook. Further, when the movable hook approaches and separates from the fixed hook using a feed mechanism composed of a feed screw and a moving block as a moving means, the amount of movement can be set finely. The attachment / detachment device of the present invention is preferably a linear cylinder that can move the movable hook quickly because the amount of movement of the movable hook increases when attaching / detaching the attachment. Although the movement of the moving block is relatively slow, the moving mechanism can move the moving block quickly by automatically turning the feed screw by driving means such as an electric motor.

It is a front view showing an example of the attachment attaching / detaching apparatus to which the present invention is applied. It is a left view of the attachment attaching / detaching apparatus of this example. It is a right view of the attachment attaching / detaching apparatus of this example. It is a front view showing the procedure 1 which attaches an attachment. It is a front view showing the procedure 2 which attaches an attachment. It is a front view showing the procedure 3 which attaches an attachment. It is a front view showing the procedure 4 which attaches an attachment. It is a front view showing the procedure 5 which attaches an attachment. It is a front view showing another example of the attachment detachment device to which the present invention is applied.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the attachment attaching / detaching apparatus 1 according to the present invention is provided in an arm connecting portion 2 that is connected to an arm 6 (see FIG. 5 described later), and an attachment 7 (see FIG. 5 described later) A fixed hook 3 for engaging one pin 71, a movable hook 4 supported by the arm connecting portion 2 and linearly approaching and moving away from the fixed hook 3 and engaging the other pin 72 of the attachment 7, and an arm connection The closing hook 5 is supported by the portion 2 and swings in the direction in which one pin 71 of the attachment 7 is engaged with the fixing hook 3 to close or open the opening edge 31 of the fixing hook 2.

  For the convenience of explanation, the attachment / detachment apparatus 1 is up and down in FIG. 1, the front and back are left and right in FIG. 1, and the left and right are front and back in FIG. The arm connection portion 2 is not greatly different from the conventional attachment connection device, and a pair of main body plates 21 each provided with an arm connection pin hole 211 and a link connection pin hole 212 are connected to the flat connection plate 22 and the connection The reinforcing plate 23 having a bent cross section above the plate 22 is sandwiched and integrated. In the arm connecting portion 2 of this example, a fixed hook 3, a movable hook 4, a closing hook 5, and a linear cylinder (hydraulic cylinder) 44 that is a moving means of the movable hook 4 are arranged below the connecting plate 22. ing.

  The fixed hook 3 is configured by providing a fixed hook end plate 33 on a fixed hook constituting plate 32 obtained by extending the main body plate 21 below the connection plate 22. The fixed hook component plate 32 has a substantially triangular shape in a side view in which a front edge is curved while being curved backward, and a fixed hook is formed by allocating a metal ring having a semicircular arc shape in a side view to a portion where a lower end corner portion is notched. An end 33 is formed. The fixed hook component plate 32 is in a positional relationship to sandwich a movable hook component plate 421 and a hook lever 51 described later. Since the fixed hook 3 of this example is composed of a pair of left and right fixed hook constituting plates 32 that are extensions of the main body plate 21, there is a pair of left and right. The open edge 31 of the fixed hook 3 in this example is an open portion of the fixed hook end portion 33 and is open in a direction inclined rearward and slightly downward (see the phantom line in FIG. 1).

  The movable hook 4 is configured by providing a movable hook end portion 45 on a movable hook constituting plate 421 that is lowered downward from a moving base 42 that is sandwiched between main body plates 21 and moves back and forth. The movable hook component plate 421 is a side view deformed pentagonal shape in which the front and rear intermediate positions protrude downward, and the movable hook end portion 45 is directed to a portion where the lower end corner portion is cut out by placing a semicircular arc-shaped metal ring on the side view. Configure. The movable hook component plate 421 is in a positional relationship in which the outer surface is in sliding contact with the inner surface of the fixed hook component plate 32. Since the movable hook 4 of this example is composed of a pair of left and right movable hook constituting plates 421 lowered from the moving base 42, there are a pair of left and right movable hooks. The open edge 41 of the movable hook 4 in this example is an open portion of the movable hook end portion 45 and is open toward the front side (see the phantom line in FIG. 1). Thereby, the fixed hook 3 and the movable hook 4 open the opening edges 31 and 41 of each other in the front-rear direction and engage the pins 71 and 72 of the attachment 7 from the inside, respectively.

  The movement base 42 of this example is in a block shape sandwiched between the main body plates 21 and is hollow to allow the tube 441 of the direct acting cylinder 44 to pass therethrough as described later. Further, the movable base 42 of this example lowers the pair of left and right movable hook constituting plates 421 so as to sandwich the hook lever 51 provided with the closing hook 5. The moving base 42 of this example is configured such that the slider 423 that protrudes to the left and right is sandwiched between the slider guide 213 and the connecting plate 22 that are steps formed on the inner surface of the main body plate 21 and extend forward and backward. It can move linearly back and forth without rattling.

  The moving base 42 of this example is provided with a tube fixing plate 422 at the front end, penetrates the tube 441 of the linear cylinder 441 that projects the rod 422 toward the rear, and fixes the tube fixing plate 422. The linear cylinder 44 has the front end of the rod 422 fixed to a rod fixing block 214 that is sandwiched between the body plates 21 and fixed in position. As a result, when the linear cylinder 44 expands and contracts the rod 422, the tube 441 moves back and forth relative to the rod 422 that expands and contracts, and the moving base 42 that fixes the tube 441 moves back and forth. The movable hook 4 provided on the base 42 approaches and separates from the fixed hook 3.

  The attachment attaching / detaching device 1 of this example is a cam groove comprising a straight groove 431 extending in the moving direction of the movable hook 4 and an oblique groove 432 bent downward from the rear end (end near the fixed hook 3) of the straight groove 431. 43 is provided on the movable hook 4, and the operating pin 511 protruding from the hook lever 51 provided with the closing hook 5 is engaged with the cam groove 43. A pair of left and right cam grooves 43 in this example are formed on the opposing inner surfaces of the left and right movable hook constituting plates 421 and are not visible from the outside (shown by broken lines in FIG. 1). Since the cam groove 43 only needs to be able to move back and forth in synchronization with the movement of the movable hook 4, for example, a separate block having a cam groove may be attached to the movable hook constituting plate 421.

  The closing hook 5 has a configuration in which an operating pin 411 and a closing hook end 52 are provided on a hook lever 51 in which a swinging shaft 512 projecting left and right is pivotally attached to the inner surface of the fixed hook constituting plate 32. The hook lever 51 has a flat isosceles triangle shape that protrudes downward in a side view and is formed by a block having a width of an interval between the opposing inner surfaces of the left and right movable hook constituting plates 421. The swing shaft 512 protrudes from the front and rear intermediate positions of the hook lever 51 to the left and right. The operating pin 41 protrudes left and right from the front end of the hook lever 51 and is engaged with each of the cam grooves 43 provided on the inner surfaces of the left and right movable hook constituting plates 421. The closing hook end portion 52 is formed by bending the rear end of the hook lever 51 downward in an arc shape to a length of about ¼ circle.

  A procedure (see FIGS. 4 to 8) for attaching the attachment 7 to the attachment attaching / detaching apparatus 1 of this example will be described. As shown in FIG. 4, the attachment attaching / detaching apparatus 1 connects the arm 6 via the arm connecting pin 64 that is previously attached to the arm connecting pin hole 212, and via the link connecting pin 65 that is attached to the link connecting pin hole 211. Link 61 is connected. In the construction machine of this example, a rod 63 of an operation cylinder (not shown, hydraulic cylinder) that swings the attachment 7 is connected to the attachment attaching / detaching device 1 via a link 61 and is connected to a link lever 62 supported by the arm 6. The connecting shaft of the rod 63 and the link 61 is supported in a swingable manner.

  In the attachment attaching / detaching device 1 of this example, the fixed hook 3 and the movable hook 4 are configured to engage the pins 71 and 72 of the attachment 7 from the inside, respectively, so that when the attachment 7 is connected, the movable hook 4 is fixed to the fixed hook 3. 3 is made as close as possible to reduce the distance between the fixed hook end 33 and the movable hook end 45 so that the fixed hook 3 and the movable hook 4 can be inserted between the pins 71 and 72 of the attachment 7. There is a need. Specifically, if the shortest distance connecting the protruding ends of the fixed hook end portion 33 and the movable hook end portion 45 is shorter than the shortest distance connecting the peripheral surfaces of the pins 71 and 72 of the attachment 7, the pin 71 of the attachment 7 Between 72, the fixed hook 3 and the movable hook 4 can be inserted.

  However, in the attachment attaching / detaching device 1 of the present invention, the movable hook 4 is first moved as far as possible from the fixed hook 3 by extending the rod 442 of the linear cylinder 44, and the distance between the fixed hook end 33 and the movable hook end 45 is increased. Enlarge. Accordingly, the position of the hook lever 51 of the closing hook 5 supported by the stationary hook constituting plate 32 that does not move is fixed, whereas the cam groove 43 formed in the movable movable hook constituting plate 421 relatively The working pin 511 of the hook lever 51 moves to the inclined groove 512 of the cam groove 43 away from the hook lever 51. As a result, the hook lever 51 swings so as to lift the closing hook end 52, and the open edge 31 of the fixed hook 3 is completely opened (see FIG. 4).

  At this time, the open edge 41 of the movable hook 4 is also open, but the attachment attaching / detaching device 1 of this example engages the fixed hook 3 with one pin 71 of the attachment 7 in advance as shown in FIG. Let Since the inner peripheral edge of the fixed hook end portion 33 with which one pin 71 of the attachment 7 abuts is an arc that is concentric and has the same diameter as the pin 71, the positional relationship and posture between the attachment 7 and the attachment attaching / detaching device 1 are not uniform. However, if the pin 71 and the fixed hook end 33 are aligned on the same axis, one pin 71 of the attachment 7 can be engaged with the fixed hook 3. Since the fixing hook 3 is merely engaged with one pin 71 of the attachment 7 from the front side, if the attachment attaching / detaching device 1 is moved forward or the attachment 7 is moved backward, one pin of the attachment 7 is attached. 71 is released.

  Thus, with one pin 71 of the attachment 7 engaged with the fixed hook 3, the rod 442 of the linear cylinder 44 is contracted to bring the movable hook 4 closer to the fixed hook 3 as shown in FIG. The distance between the portion 33 and the movable hook end 45 is made as small as possible. Accordingly, the position of the hook lever 51 of the closing hook 5 supported by the stationary hook constituting plate 32 that does not move is fixed, whereas the cam groove 43 formed in the movable movable hook constituting plate 421 relatively Approaching the hook lever 51, the operating pin 511 of the hook lever 51 moves to the straight groove 511 of the cam groove 43. As a result, the hook lever 51 swings so as to lower the closing hook end 52, and the open edge 31 of the fixed hook 3 is closed.

  As described above, in a state where the closing hook 5 opens the opening edge 31 of the fixed hook 3, one pin 71 of the attachment 7 can be easily released from engagement with the fixed hook 3. When the closing hook 5 closes the open edge 31 of the fixed hook 3, the pin 71 is not released from the fixed hook 3. Since the inner peripheral edge of the fixed hook end portion 33 of the fixed hook 3 and the one pin 71 of the attachment 7 are coaxial and have the same diameter, the pin 71 can rotate even when it is not released from the fixed hook 3. As a result, the attachment 7 in a state where the pin 71 is engaged with the fixed hook 3 is swung around the pin 71 to lift the other pin 72 and close to the fixed hook 3 as shown in FIG. The movable hook 4 can be positioned in front of the movable hook 4.

  With the other pin 72 of the attachment 7 positioned in front of the fixed hook 4 in this way, the rod 442 of the linear cylinder 44 is extended and the movable hook 4 is moved away from the fixed hook 3 as shown in FIG. The hook 4 is engaged with the pin 72 from behind, and the attachment of the attachment 7 to the attachment attaching / detaching device 1 is completed. Here, even if the movable hook 4 is moved forward, the distance between the fixed hook end portion 33 and the movable hook end portion 45 is not maximized, so that the operating pin 511 remains in the straight groove 431 of the cam groove 43. The hook lever 51 is not swung. This means that the closing hook 5 closes the fixed hook 3.

  Although illustration is omitted, when the attachment 7 is removed from the attachment attaching / detaching device 1, the procedure is the reverse of the above. First, the movable hook 4 is moved so as to approach the fixed hook 3, and the other pin 72 of the attachment 7 is removed from the movable hook 4 (see FIG. 7). The movable hook 4 has only to move to the extent that the engagement of the other pin 72 is released, and does not need to be as close as possible to the fixed hook 3. At this stage, one pin 71 of the attachment 7 is held on the fixed hook 3 by the closing hook 5, and there is no possibility that the attachment 7 will accidentally fall off the attachment attaching / detaching device 1.

  The attachment 7 with the other pin 72 removed from the movable hook 4 is tilted with the one pin 71 held by the fixed hook 3 swinging about the axis (see FIG. 6), so that the movable hook 4 is detached from the fixed hook 3. It becomes possible to move forward (see FIG. 5). Thus, when the movable hook 4 is moved away from the fixed hook 3 to the maximum extent, the operating pin 511 moves to the inclined groove 432 of the cam groove 43, the hook lever 61 swings, and the closing hook 5 moves the open edge 31 of the fixed hook 3 away. Release (see FIG. 5). Thus, the attachment 7 can be detached from the attachment attaching / detaching device 1. As described above, according to the attachment attaching / detaching device 1 of the present invention, since one pin 71 is continuously held by the fixing hook 3 from immediately after the attachment 7 is started to immediately before the removal is completed, the attachment 7 is not prepared. Is prevented from falling off.

  In a state where the attachment 7 is attached to the attachment attaching / detaching device 1, there is a possibility that the movable hook 4 may move freely due to an external impact. Since the linear motion cylinder 44 is connected to the movable hook 4, it does not move greatly due to the impact. For this reason, even if the other pin 72 of the attachment 7 is detached from the movable hook 4, the closing hook 3 keeps closing the fixed hook 3, so that one pin 71 of the attachment 7 is attached to the fixed hook 3. The attachment 7 is not dropped from the attachment attaching / detaching device 1 while being held.

  Since the movable hook 4 only needs to be linearly moved toward and away from the fixed hook 3, the moving means is not limited to the direct acting cylinder 44. For example, a feed screw mechanism can be used as the moving means of the movable hook 4 as in the attachment attachment / detachment apparatus 1 of another example shown in FIG. The attachment attaching / detaching device 1 of another example 1 spans a feed screw 216 between a feed screw motor 215 provided at the rear end of the connection plate 22 and a feed screw support plate 217 provided at the front end of the connection plate 22. A feed screw mechanism in which a moving block 424 provided on the moving base 42 is screwed to the feed screw 216 is configured. Since the configuration other than the feed screw mechanism is the same as the above example (see FIGS. 1 to 3), the description thereof is omitted.

  In the attachment device 1 of another example 1, since the moving means of the movable hook 4 is merely replaced with the feed screw mechanism, the attachment 7 can be attached and detached by following the same procedure as the above example (see FIGS. 1 to 3). Unlike the direct acting cylinder 44, it is difficult to rotate the feed screw 216 in addition to using the feed screw motor 215. Therefore, the attachment device 1 of Example 1 is unlikely to move the movable hook 4 due to external force, and the pin 71 of the attachment 7 , 72 as well as only one of them is less likely to come off from the fixed hook 3 or the movable hook 4. From this, when the feed screw mechanism is used as the moving means, it is possible to further reduce the possibility that the attachment 7 will be inadvertently dropped and to further improve the safety of the attachment attaching / detaching device 1.

1 Attachment attachment / detachment device 2 Arm connection part
21 Main plate
22 Connection board
23 Reinforcing plate 3 Hook
31 Opening edge of fixing hook
32 Fixed hook component plate 4 Movable hook
41 Opening edge of movable hook
42 Moving base
43 Cam groove
44 Linear cylinder
441 tubes
442 Rod 5 Closure hook
51 Hook lever 6 Arm
61 links
62 Link lever
63 Operating cylinder rod
64 Arm connection pin
65 Link connecting pin 7 Attachment
71 one pin
72 other pin

Claims (4)

An attachment attachment / detachment device interposed between an arm of a construction machine or a rod or link of an operation cylinder and an attachment,
A fixing hook provided on the arm connecting portion connected to the arm, and hooking one pin of the attachment;
A movable hook that is supported by the arm connecting portion and linearly approaches and separates from the fixed hook and engages the other pin of the attachment;
A closing hook that is supported by the arm connecting portion and swings in the moving direction of the movable hook to close or open the opening edge of the fixed hook;
The movable hook is provided with a cam groove composed of a linear groove extending in the moving direction and an oblique groove bent from an end of the linear groove near the fixed hook,
An attachment attaching / detaching device, wherein the closing hook is provided with an operating pin that engages with the cam groove. The attachment attaching / detaching device according to claim 1, wherein the fixed hook and the movable hook are opened in directions in which the respective open edges move away from each other. The movable hook connects the other of the tube or the rod of the linear cylinder with one of the tube or the rod supported to the arm connecting portion, and approaches and separates from the fixed hook according to the expansion and contraction of the rod of the linear cylinder. The attachment attaching / detaching device according to either 1 or 2. The attachment according to claim 1 or 2, wherein the movable hook is provided with a moving block that is screwed to a feed screw supported by the arm connecting portion, and moves toward and away from the fixed hook in accordance with manual or automatic rotation of the feed screw. Detachable device.

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