Work equipment

Abstract

In a work machine equipped with an opening / closing door with a locking mechanism, the malfunction of the locking mechanism is suppressed. [Solution] The work machine 10 has a door body 41 and an opening / closing door 40 having a hinge 42 equipped with a first shaft 43, and a locking mechanism 50 capable of holding the opening / closing door 40 in an open state. The locking mechanism 50 comprises a second shaft 52, an engaging member 51 that is pivotably supported by the second shaft 52, and a pin 45. The engaging member 51 comprises a plate-shaped main body portion 55, a shaft hole 58 formed in the main body portion through which the second shaft 52 is inserted, and a hook portion 56 formed in the main body portion 55 at a position spaced apart from the shaft hole 58. The second shaft 52 revolves around the first shaft 43 in accordance with the rotation of the door body 41 around the first shaft 43, and the engaging member 51 swings around the second shaft 52 in accordance with the revolving of the second shaft 52 around the first shaft 43. The hook portion 56 engages with the pin 45 when the door body 41 is positioned in a predetermined open position around the first shaft 43.

Description

Technical Field

[0006] , , ,

[0001] The present invention relates to a working machine.

Background Art

[0002] Conventionally, in a cover that constitutes the exterior of a machine body, a working machine having a space for accommodating maintenance supplies (such as a grease gun) is known (see Patent Document 1). The working machine of Patent Document 1 includes an opening / closing door that enables the opening and closing of the space. The working machine disclosed in Patent Document 1 is an excavator, and in the left-turning cover that constitutes the exterior of the machine body, the opening / closing door is provided.

Prior Art Documents

Patent Documents

[0003] [[ID=Z3]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional opening / closing door, a configuration having a locking mechanism that automatically holds the rotational position (opening degree) of the door when the door is opened to a predetermined rotational position (for example, the fully open position) is known. However, in the conventional locking mechanism, an accidental lock may occur before the door reaches the predetermined rotational position when the machine body is tilted or the like.

[0005] The present disclosure aims to suppress an accidental operation of a locking mechanism in a working machine provided with an opening / closing door having the locking mechanism.

Means for Solving the Problems

[0006] The work machine of this disclosure comprises a machine body, a cover constituting the exterior of the machine body, a door body, and an opening / closing door provided on the cover, having a hinge having a first shaft that rotatably supports the door body relative to the cover, and a locking mechanism capable of holding the opening / closing door in an open state, wherein the locking mechanism comprises a second shaft having an axis parallel to the axis of the first shaft and fixed to the door body, an engaging member supported by the second shaft so as to be swingable, and an engaged member fixed to the cover, wherein the engaging member comprises a plate-shaped main body portion, an axial hole formed in the main body portion through which the second shaft is inserted, and a hook portion formed in the main body portion at a position spaced apart from the axial hole, wherein the second shaft revolves around the first shaft in accordance with the rotation of the door body around the first shaft, the engaging member swings around the second shaft in accordance with the revolving of the second shaft around the first shaft, and the hook portion engages with the engaged member when the door body is in a predetermined open position. [Effects of the Invention]

[0007] According to this disclosure, in a work machine equipped with an opening / closing door having a locking mechanism, it is possible to suppress the erroneous operation of the locking mechanism. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic left side view showing a work machine according to one embodiment of the present disclosure. [Figure 2] Figure 2 is a perspective view showing the left-rotating cover (with the opening / closing door in the closed position). [Figure 3] Figure 3 is a perspective view showing the left-rotating cover (with the opening / closing door in the open position). [Figure 4] Figure 4 is a perspective view showing the first hinge and locking mechanism. [Figure 5] Figure 5 is a perspective view showing the second hinge. [Figure 6] Figure 6 is a partial cross-sectional view showing the opening and closing door and the locking mechanism. [Figure 7] Figure 7 is an explanatory diagram (part 1) of the operation of the locking mechanism. [Figure 8] Figure 8 is an explanatory diagram (part 2) of the operation of the locking mechanism. [Figure 9] Figure 9 is an explanatory diagram showing the restrictive state of the engaging member when the opening and closing door is in the closed position. [Modes for carrying out the invention]

[0009] <Summary of the embodiments of this disclosure> The embodiments of the invention disclosed herein are outlined below. (1) The work machine of the present disclosure comprises a machine body, a cover constituting the exterior of the machine body, a door body, and an opening / closing door provided on the cover, having a hinge having a first axis that rotatably supports the door body relative to the cover, and a locking mechanism capable of holding the opening / closing door in an open state, wherein the locking mechanism comprises a second axis having an axis parallel to the axis of the first axis and fixed to the door body, an engaging member that is pivotably supported by the second axis, and an engaged member fixed to the cover, The engaging member comprises a plate-shaped main body, an axial hole formed in the main body through which the second shaft is inserted, and a hook portion formed in the main body at a position spaced apart from the axial hole, wherein the second shaft revolves around the first shaft in accordance with the rotation of the door body around the first shaft, the engaging member swings around the second shaft in accordance with the revolving of the second shaft around the first shaft, and the hook portion engages with the engaged member when the door body is in a predetermined open position.

[0010] The locking mechanism described above uses a plate-shaped engaging member, which prevents the engaging member from becoming fixed to the second shaft. This allows the engaging member to always swing along the intended trajectory. Therefore, according to this configuration, in a work machine equipped with an opening / closing door having a locking mechanism, erroneous operation of the locking mechanism can be suppressed.

[0011] (2) In the work machine according to the embodiment of (1) above, the engaging member further comprises an overhang extending from an intermediate portion in the first direction which is the direction connecting the second axis of the main body and the hook portion in a second direction which intersects the first direction, and it is preferable that the center of gravity of the engaging member is located away from the axis of the first direction which passes through the axial center of the second axis. The locking mechanism described above, by providing an overhang to adjust the position of the center of gravity of the engaging member, allows the engaging member to swing naturally due to its own weight when the door body is opened from the closed state. This ensures that the engaging member always swings along the intended trajectory. Therefore, according to this configuration, in a work machine equipped with an opening and closing door having a locking mechanism, erroneous operation of the locking mechanism can be suppressed.

[0012] (3) In the work machine according to the embodiment of (2) above, the door body, when rotated to a predetermined closed position, is capable of contacting the protruding portion, and it is preferable that rotation of the engaging member beyond a first predetermined angle toward the door body is restricted by contact with the door body. The locking mechanism described above can restrict the displacement (swinging) of the protruding portion by the door body when the door body is in the closed position. In this case, the position of the engaging member can be kept constant when the door body is in the closed position, thereby allowing the engaging member to swing along a predetermined trajectory.

[0013] (4) In the work machine according to the form of (1) or (2) above, the engaging member is preferably positioned between the opening / closing door and the cover when the opening / closing door is rotated to a predetermined closed position, and rotation exceeding a second predetermined angle away from the opening / closing door is restricted by contact with the cover. The locking mechanism described above can restrict the displacement (swinging) of the protruding portion by the door body when the door body is in the closed position. In this case, the position of the engaging member can be kept constant when the door body is in the closed position, thereby allowing the engaging member to swing along a predetermined trajectory.

[0014] (5) In the work machine according to the form of (3) above, it is preferable that the protruding part also serves as a gripping part for gripping when rotating the engaging member. With the lock mechanism of the above configuration, there is no need to separately provide a part that serves as a gripping part, and the configuration of the lock mechanism can be simplified.

[0015] (6) In the work machine according to any one of the forms of (1) to (5) above, the hook part has a first claw part formed on the rear side in the swinging direction of the engaging member when the door body is rotated from a predetermined closed position to a predetermined open position around the first axis, a second claw part formed on the front side, and a recess formed between the first claw part and the second claw part. In the first direction, which is the direction connecting the second axis and the hook part, it is preferable that the length of the first claw part is longer than the length of the second claw part. In the lock mechanism with such a configuration, the first claw part can easily overcome the engaged member, and the second claw part is difficult to overcome the engaged member. Therefore, according to the lock mechanism with such a configuration, the recess of the hook part that has overcome the engaged member can be reliably engaged with the engaged member. Thereby, it is possible to suppress the occurrence of accidental locking in the lock mechanism.

[0016] (7) The work machine according to the form of (6) above preferably causes the first claw part to overcome the engaged member by applying an external force to the door body and rotating it around the first axis beyond a predetermined closed position to a predetermined open position, and when the external force is released, the engaged member is accommodated in the recess and the engaging member is engaged with the engaged member. The lock mechanism with such a configuration can engage the engaging member and the engaged member by a natural operation of opening and closing the door by the user.

[0017] (8) In the work machine according to any one of the forms of (1) to (7) above, it is preferable that the engaged member is provided on the hinge. The lock mechanism with such a configuration can configure the lock mechanism to be compact by providing the engaged member on the hinge.

[0018] <Details of Embodiments of the Invention Disclosed> The embodiments of this disclosure will be described in detail below with reference to the figures. At least some of the embodiments described below may be combined in any way.

[0019] [Overall configuration of the work equipment] Figure 1 is a schematic left side view showing a work machine according to one embodiment of the present disclosure. Figure 1 shows a work machine 10 according to one embodiment of the work machine of the present disclosure. The work machine 10 is a backhoe. As shown in Figure 1, the work machine 10 comprises a body 11, a traveling device 12, a work device 13, a cabin 14, and a driver's seat 15. The work machine 10 may also be configured to have a canopy instead of a cabin 14.

[0020] In the following description, with the operator seated in the driver's seat 15 as the reference point, the direction toward the front of the implement 10 is referred to as the front, and the direction toward the rear is referred to as the rear, and the front-rear direction of the implement 10 is indicated by arrow X. In addition, in the following description, the direction toward the left of the operator seated in the driver's seat 15 is referred to as the left of the implement 10, and the direction toward the right is referred to as the right, and the left-right direction of the implement 10 is indicated by arrow Y. The left-right direction of the implement 10 is also referred to as the width direction. Furthermore, in the following description, the up-down direction of the implement 10 is indicated by arrow Z. The up-down direction of the implement 10 is perpendicular to the front-rear and left-right directions.

[0021] As shown in Figure 1, the travel device 12 is a crawler-type travel device that supports the machine body 11 so that it can move. The travel device 12 is driven by a hydraulic motor (not shown). In this embodiment, a crawler-type travel device 12 is used, but the configuration of the travel device in the work machine 10 of this disclosure is not limited to this, and a wheel-type or other travel device may be used. The work machine 10 further includes a dozer device 16. The dozer device 16 is provided at the front of the travel device 12. Note that the dozer device 16 may be provided at the front or rear of the work machine 10, or it may be omitted.

[0022] [About the aircraft] As shown in Figure 1, the aircraft body 11 comprises a slewing frame 20 and a cover 30. The slewing frame 20 and the cover 30 constitute the outer shell of the aircraft body 11. Inside the outer shell formed by the slewing frame 20 and the cover 30, the aircraft body 11 houses an engine (not shown) and various other devices. Although detailed explanations are omitted in this description, in addition to the engine, the aircraft body 11 further comprises various devices (not shown), such as a fuel tank, cooling fan, radiator, oil cooler, fuel cooler, slewing motor, battery, hydraulic pump, exhaust gas purification device, air cleaner, hydraulic oil tank, and control valve.

[0023] The slewing frame 20 is mounted on the traveling device 12 via a slewing bearing 21. The slewing bearing 21 supports the machine body 11 relative to the traveling device 12. The machine body 11 is configured to be rotatable around the slewing axis C of the slewing bearing 21. The slewing axis C is the axis of the machine body 11 that extends in the vertical direction.

[0024] In the work machine 10 of this disclosure, the cover 30 includes a rear-swinging cover (rear bonnet) 31 and a left-swinging cover 32. The cover 30 further includes a right-swinging cover and a tank cover, etc., which are not shown. The rear-swinging cover 31 is the part of the cover 30 located on the rear side of the machine body 11. The left-swinging cover 32 is the part of the cover 30 located on the left side of the machine body 11. The left-swinging cover 32 has an opening and closing door 40.

[0025] [About the work equipment] The working device 13 comprises a boom 22, an arm 23, and a bucket 24. The base of the boom 22 is supported by a first horizontal axis member of the slewing frame 20 and is configured to be rotatable around the first horizontal axis member. The boom 22 swings in conjunction with the extension and retraction of the boom cylinder 26. The boom 22 has a second horizontal axis member at its tip that extends in a direction perpendicular to the vertical direction. The arm 23 is supported by the second horizontal axis member of the boom 22 and is configured to be rotatable around the second horizontal axis member. The arm 23 swings in conjunction with the extension and retraction of the arm cylinder 27. The arm 23 has a third horizontal axis member at its tip that extends in a direction perpendicular to the vertical direction. The bucket 24 is supported by the third horizontal axis member of the arm 23 and is configured to be rotatable around the third horizontal axis member. The bucket 24 swings in conjunction with the extension and retraction of the bucket cylinder 28. The boom cylinder 26, arm cylinder 27, and bucket cylinder 28 are composed of hydraulic cylinders (hydraulic actuators).

[0026] [Regarding opening and closing doors] Figure 2 is a perspective view showing the left-swivel cover (with the opening / closing door closed). Figure 3 is a perspective view showing the left-swivel cover (with the opening / closing door open). Figure 4 is a perspective view showing the first hinge and locking mechanism. Figure 5 is a perspective view showing the second hinge. As shown in Figures 1 and 2, in the work machine 10, the left-swivel cover 32 is equipped with an opening / closing door 40. The opening / closing door 40 covers a space A inside the left-swivel cover 32 for housing standard equipment (e.g., a grease gun), and can be opened and closed. Figure 2 shows the opening / closing door 40 in the "closed" state, and Figure 3 shows the opening / closing door 40 in the "open" state. In this embodiment, the case in which the opening / closing door 40 is provided on the left-swivel cover 32 is illustrated as an example, but the location of the opening / closing door 40 is not limited to this, and it may be provided on the rear-swivel cover 31, the right-swivel cover, the tank cover, etc. Also, the number, size, and shape of the opening / closing door 40 are not particularly limited.

[0027] As shown in Figures 1 to 3, the opening and closing door 40 includes a door body 41 and a hinge 42. The left-swing cover 32 and the door body 41 are made of steel plate. The opening and closing door 40 constitutes part of the outer shell of the left-swing cover 32. The upper edge of the door body 41 is rotatably supported by the hinge 42. The hinge 42 includes a first hinge 42a and a second hinge 42b. The door body 41 is configured to be able to rotate approximately upward using the upper hinge 42 as a pivot point by pulling the lower end to the left side of the machine body 11.

[0028] In this description, the state in which the opening / closing door 40 is "closed" refers to the state in which the door body 41 is rotated to the closed position, and is hereinafter also referred to as the "closed state". In this description, the state in which the opening / closing door 40 is "open" refers to the state in which the door body 41 is rotated to a position other than the closed position (open position), and is hereinafter also referred to as the "open state". Furthermore, in this description, the state in which the opening / closing door 40 is "fully open" refers to the state in which the door body 41 is rotated to the fully open position, and is hereinafter also referred to as the "fully open state". When the door body 41 is rotated to the fully open position, it is held in the fully open position by a locking mechanism which will be explained later. In this embodiment of the opening / closing door 40, the door body 41 is configured to be rotatable to a position beyond the fully open position (hereinafter also referred to as the "excess position"). In this description, the fully open position and the excess position are included in the open position.

[0029] As shown in Figures 3 to 5, the hinge 42 includes a first shaft 43 that rotatably supports the door body 41. The first shaft 43 is divided into a first hinge 42a side and a second hinge 42b side. The first shaft 43 on the first hinge 42a side and the first shaft 43 on the second hinge 42b side are arranged coaxially. In this embodiment, the opening and closing door 40 supports the door body 41 rotatably with two hinges 42 (first hinge 42a and second hinge 42b), but the number of hinges 42 is not limited to this, and the number can be appropriately selected according to the size, shape, and weight of the door body 41.

[0030] As shown in Figures 3 to 5, the hinge 42 includes a support stay 44 that supports the first shaft 43. The support stay 44 is fixed to the inner surface 35 of the left-swinging cover 32 by fastening members (bolts) 47. The first shaft 43 is inserted through a cylindrical shaft member 41a attached to the door body 41.

[0031] As shown in Figures 3 and 4, the first hinge 42a further includes a pin 45, which is an engaged member. The pin 45 constitutes part of the locking mechanism 50, which will be described later. The pin 45 is fixed to the support stay 44 in a position parallel to the first axis 43. The pin 45 is positioned below the first axis 43. The tip 45a of the pin 45 protrudes forward from the support stay 44 (towards the side where the locking mechanism 50, which will be described later, is located). As shown in Figure 5, the second hinge 42b differs from the first hinge 42a in that it does not have a pin 45, but its other configurations are the same as the first hinge 42a. In this embodiment, a case in which a pin is used as the engaged member is illustrated, but the locking mechanism of this disclosure may employ an engaged member having a form other than a pin.

[0032] [About the locking mechanism] Figure 6 is a partial cross-sectional view showing the opening / closing door and the locking mechanism. For the sake of clarity, in Figure 6, the parts of the locking mechanism 50 that are located in front of the engaging member 51 are not shown. As shown in Figures 3 and 6, the opening / closing door 40 is equipped with a locking mechanism 50. The locking mechanism 50 is a mechanism that maintains the rotated position of the door body 41 when it is rotated to the fully open position. In other words, the locking mechanism 50 is a mechanism that holds the door body 41 in the fully open position.

[0033] As shown in Figures 4 and 6, the locking mechanism 50 comprises an engaging member 51, a second shaft 52, a connecting plate 53, a cylindrical shaft 54, and the pin 45 described earlier. In the locking mechanism 50, the connecting plate 53 and the cylindrical shaft 54 ​​are integrally formed and constitute the main body of the locking mechanism 50. The connecting plate 53 is fixed to a stay portion 41b provided on the door body 41 by a fastening member 47. The stay portion 41b is made up of a plate-shaped member protruding from the side surface of the door body 41 toward the inward side of the machine body 11. In this embodiment, the locking mechanism 50 utilizes the support stay 44 of the first hinge 42a to provide the pin 45, eliminating the need to secure space for the installation of the pin 45, thereby achieving a compact configuration.

[0034] The cylindrical shaft 54 ​​coaxially supports the second shaft 52, which is inserted through it. The second shaft 52, supported by the cylindrical shaft 54, is positioned parallel to the first shaft 43, which supports the door body 41. The second shaft 52 extends to a position that overlaps with the area where the tip portion 45a of the pin 45 is located, in the axial direction of the pin 45 and in a direction parallel thereto (the front-to-back direction in this embodiment). In the portion of the second shaft 52 that overlaps with the area where the tip portion 45a is located, the engaging member 51 is pivotably supported.

[0035] The engaging member 51 engages with the tip 45a of the pin 45. The locking mechanism 50 holds the door body 41 in a fully open position when the engaging member 51 and the pin 45 are engaged.

[0036] The engaging member 51 is a plate-shaped member made of steel plate and has a main body portion 55, a hook portion 56, and an overhanging portion 57. The main body portion 55 is a plate-shaped part that constitutes the main part of the engaging member 51 and has a shape that extends in the first direction D1. As shown in Figure 6, the main body portion 55 has an axial hole 58 formed at one end in the first direction D1. The main body portion 55 (engaging member 51) is supported so as to be swingable by the second shaft 52, which is inserted through the axial hole 58. The main body portion 55 is swingable in a state where it hangs down below the second shaft 52 due to the action of its own weight.

[0037] The hook portion 56 is the part that engages with the pin 45 and is formed at the other end of the main body portion 55 in the first direction D1. The hook portion 56 has a first claw portion 56a, a second claw portion 56b, and a recess 56c. The hook portion 56 engages with the pin 45 (tip portion 45a) in the recess 56c formed between the first claw portion 56a and the second claw portion 56b. In the first direction D1, the length of the second claw portion 56b is longer than the length of the first claw portion 56a.

[0038] The protruding portion 57 is a part that extends from the middle of the main body portion 55 in the first direction D1 toward the second direction D2 which intersects the first direction D1. The protruding portion 57 is provided to adjust the position of the center of gravity G of the engaging member 51. In the engaging member 51 provided with the protruding portion 57, the position of the center of gravity G is shifted toward the protruding portion 57 side from the straight line extending in the first direction D1 through the axis of the shaft hole 58. As a result, the engaging member 51, which swings while hanging downward from the second shaft 52, naturally swings due to the action of its own weight so that the center of gravity G is located directly below the second shaft 52. In this way, the engaging member 51 is configured to naturally assume a forward-leaning posture toward the protruding portion 57 side.

[0039] Furthermore, in the locking mechanism 50 of this embodiment, the protruding portion 57 serves as a portion (gripping portion) for gripping the engaging member 51 when a user opening or closing the door 40 releases the locking mechanism 50.

[0040] As shown in Figure 6, in the opening / closing door 40 and locking mechanism 50, the door body 41 is configured to be rotatable around the first shaft 43 with respect to the axial position P1 of the first shaft 43. As the door body 41 rotates around the axial position P1, the axial position P2 of the second shaft 52 revolves around the first shaft 43 along an arc C1 centered on the axial position P1. The engaging member 51 is displaced in the left-right and up-down directions as the second shaft 52 revolves, and also swings due to the action of its own weight. Furthermore, the engaging member 51 comes into contact with the tip 45a of the pin 45 as the second shaft 52 is displaced. The engaging member 51, in contact with the tip 45a, swings and changes its posture as the relative position between the position of the second shaft 52 and the pin 45 changes.

[0041] [Regarding the operation of the locking mechanism] Figure 7 is an explanatory diagram (part 1) of the operation of the locking mechanism. Figure 8 is an explanatory diagram (part 2) of the operation of the locking mechanism. Figure 9 is an explanatory diagram showing the restricting state of the engaging member when the opening and closing door is in the closed position. Here, we will explain the operation of the locking mechanism 50 when the door body 41 is rotated from the closed position to the fully open position.

[0042] As shown in the left diagram of Figure 7, when the door body 41 is in the "closed state", the engaging member 51 has its main body portion 55 and hook portion 56 located below the second axis 52 and is in a state in which it can swing around the second axis 52.

[0043] When the door body 41 is in the "closed state," the engaging member 51 is sandwiched between the inner surface 35 of the left-swing cover 32 and the inner surface 49 of the door body 41. Therefore, the swinging of the engaging member 51 is restricted by the inner surface 35 and the inner surface 49. In this description, Figure 7 (left) shows a configuration in which the engaging member 51 is not in contact with the inner surface 35 and the inner surface 49. However, when the door body 41 is in the "closed state," the engaging member 51 may tilt clockwise in Figure 7 (left) due to the action of its own weight. In this case, the engaging member 51 is in a position where the hook portion 56 (second claw portion 56b) is in contact with the inner surface 35, and the protruding portion 57 is in contact with the door body 41.

[0044] As shown in the left diagram of Figure 9, when the door body 41 is in the "closed state", if the engaging member 51 is rotated in the direction toward the door body 41 (counterclockwise in the left diagram of Figure 9), the engaging member 51 (protruding portion 57) will come into contact with the door body 41 (inner surface 49) when rotated by a first predetermined angle θ1, thereby restricting rotation beyond the first predetermined angle θ1. Also, as shown in the right diagram of Figure 9, when the door body 41 is in the "closed state", if the engaging member 51 is rotated in the direction toward the door body 41 (clockwise in the right diagram of Figure 9), the engaging member 51 (hook portion 56) will come into contact with the left-swivel cover 32 (inner surface 35) when rotated by a second predetermined angle θ2, thereby restricting rotation beyond the second predetermined angle θ2. Thus, when the door body 41 is in the "closed state," the engaging member 51 is restricted from rotating clockwise and counterclockwise, so the main body 55 always hangs vertically downward.

[0045] Next, as shown in the middle diagram of Figure 7, when the door body 41 is rotated from the "closed" position to the "fully open" position and the door body 41 is in the "open state", the engaging member 51 swings due to its own weight so that its center of gravity G (see Figure 6) is located directly below the second axis 52. At this time, the main body 55 swings so that the hook portion 56 approaches the inner surface 35 (or the hook portion 56 maintains contact with the inner surface 35). At this time, the lower end of the main body 55 is closer to the inner surface 35 than the upper end. As the door body 41 rotates, the second axis 52 is displaced to the left, so the engaging member 51 continues to swing clockwise in the middle diagram of Figure 7 until the center of gravity G (see Figure 6) is located directly below the second axis 52.

[0046] Next, as shown in the right diagram of Figure 7, when the door body 41 is rotated further toward the "fully open position", the engaging member 51 will eventually have its first claw portion 56a come into contact with the tip portion 45a (pin 45). After the first claw portion 56a comes into contact with the tip portion 45a, and before the first claw portion 56a moves over the tip portion 45a, if the door body 41 is rotated further toward the "fully open position", the engaging member 51 will tilt clockwise in accordance with the change in the relative position between the contact position of the first claw portion 56a and the tip portion 45a and the second axis 52.

[0047] Next, as shown in the left diagram of Figure 8, when the door body 41 is further rotated toward the "fully open position", the engaging member 51 is displaced to the left and upward along the arc C1 (see Figure 6), and is further tilted clockwise around the second axis 52.

[0048] Next, as shown in the middle diagram of Figure 8, when the door body 41 is further rotated toward the "fully open position" and reaches the "over-rotated state," the first claw portion 56a overcomes the tip portion 45a. Then, when the first claw portion 56a overcomes the pin 45, the engaging member 51 swings counterclockwise around the second axis 52 due to the action of its own weight. As a result, the tip portion 45a enters the recess 56c.

[0049] Then, as shown in the right diagram of Figure 8, when the user releases their hand from the door body 41, the door body 41 rotates slightly clockwise to the "fully open position". When the door body 41 is rotated to the "fully open position", the tip portion 45a fits into the recess 56c, and the hook portion 56 and the pin 45 (tip portion 45a) engage. As a result, the door body 41 is locked in the fully open position by the locking mechanism 50. In other words, the locking mechanism 50 holds the door body 41 in the "fully open state" by the engagement of the engaging member 51 (hook portion 56) with the pin 45 (tip portion 45a). As described above, the locking mechanism 50 can automatically hold the door body 41 in the "fully open state" simply by the user rotating the door body 41 from the "closed" position to the "fully open" position.

[0050] When rotating the door body 41 from the "fully open" position to the "closed" position, the user can release the locking mechanism 50 by first moving the door body 41 to the "oversized" position (see Figure 8), grasping the protruding portion 57 in the "oversized" position, and rotating the engaging member 51 clockwise as shown in Figure 8. After releasing the locking mechanism 50, the user can rotate the door body 41 clockwise to the "closed" position.

[0051] [Regarding the occurrence of false locks in the locking mechanism] Conventional locking mechanisms installed in work machines have a simple configuration that does not include bearings or other components between the engaging member and the shaft supporting it, from the perspective of cost reduction. As a result, conventional locking mechanisms could become stuck together between the engaging member and the shaft if they were not used for a certain period of time. In conventional locking mechanisms, the engaging member is expected to swing due to the action of its own weight and assume a predetermined position as intended in the design. However, conventional locking mechanisms could become stuck together between the engaging member and the shaft, resulting in an unintended position. Conventional locking mechanisms could lead to false locking when the engaging member assumed an unintended position. Here, "false locking" refers to the phenomenon in which the door becomes locked when it is not in the "fully open state".

[0052] As shown in Figure 6, the locking mechanism 50 of this disclosure has a distance L1 from the inner surface 49 of the door body 41 to the inner surface 35 of the left-swinging cover 32 that is approximately equal to (but slightly larger than) the width of the engaging member 51 (distance L2 from the outer surface of the second claw portion 56b to the tip surface of the protruding portion 57). With this configuration, when the door body 41 is rotated to the closed position, the engaging member 51 is restricted from swinging around the second axis 52 by the door body 41 and the left-swinging cover 32. In other words, when the door body 41 is rotated to the closed position, the engaging member 51 is positioned between the inner surface 49 and the inner surface 35, and its swinging is restricted. With this configuration, the locking mechanism 50 can always cause the engaging member 51 to assume a predetermined position when the door body 41 is in the "closed state". Therefore, when the door body 41 is rotated from the closed position toward the fully open position, the engaging member 51 always starts swinging from a certain position. Therefore, in the locking mechanism 50 of this disclosure, the engaging member 51 reliably assumes a predetermined position as intended by the action of its own weight. As a result, the locking mechanism 50 of this disclosure can suppress the occurrence of erroneous locking because the engaging member 51 always assumes the intended position.

[0053] Furthermore, conventional locking mechanisms installed in work machines employ a pin made of steel wire as the pivoting member, and have a guide groove formed in a plate-shaped member, with the pin being displaced along this guide groove. In this case, because the pin itself is relatively lightweight, the rotational torque generated when the pin pivots due to its own weight is insufficient, which increases the possibility of the pin becoming stuck. On the other hand, the locking mechanism 50 of this embodiment has an engaging member 51 made of steel plate that is pivotable, and the pin 45 is fixed to the cover 30 side. By allowing the engaging member 51 to pivot freely and guiding it in contact with the pin 45, it is possible to displace the engaging member 51 along a predetermined trajectory. In addition, the locking mechanism 50 of this embodiment makes it easy to increase the weight of the engaging member 51 itself, which makes it possible to increase the rotational torque generated when the engaging member 51 pivots due to its own weight. Furthermore, in the locking mechanism 50 of this embodiment, the contact area between the engaging member 51 and the second shaft 52 in the shaft hole 58 is minute, and the possibility of the engaging member 51 becoming fixed to the second shaft 52 is kept low. As a result, the engaging member 51 of this embodiment is less prone to becoming fixed to the oscillating member compared to the conventional method which uses a pin as the oscillating member. Consequently, the locking mechanism 50 of this embodiment can reliably displace the engaging member 51 along a predetermined trajectory while maintaining a predetermined posture, making it less prone to erroneous locking compared to conventional locking mechanisms.

[0054] [Regarding the operation and effects of this embodiment] (1) The work machine 10 of this embodiment described above comprises a machine body 11, a left-swivel cover 32 (cover 30) that constitutes the exterior of the machine body 11, a door body 41, and an opening / closing door 40 provided on the left-swivel cover 32, having a hinge 42 with a first shaft 43 that rotatably supports the door body 41 relative to the left-swivel cover 32, and a locking mechanism 50 that can hold the opening / closing door 40 in an open state. In the work machine 10 of this embodiment, the locking mechanism 50 comprises a second shaft 52 that has an axis parallel to the axis of the first shaft 43 and is fixed to the door body 41, an engaging member 51 that is swingably supported by the second shaft 52, and a pin 45 that is fixed to the left-swivel cover 32. The engaging member 51 comprises a plate-shaped main body portion 55, an axis hole 58 formed in the main body portion 55 through which the second shaft 52 is inserted, and a hook portion 56 formed in the main body portion 55 at a position spaced apart from the axis hole 58. The second shaft 52 revolves around the first shaft 43 in response to the rotation of the door body 41 around the first shaft 43, the engaging member 51 swings around the second shaft 52 in response to the revolving of the second shaft 52 around the first shaft 43, and the hook portion 56 engages with the pin 45 when the door body 41 is positioned in a predetermined open position around the first shaft 43.

[0055] In this embodiment, the locking mechanism 50 uses a plate-shaped engaging member 51, which prevents the engaging member 51 from becoming fixed to the second shaft 52. This allows the engaging member 51 to always swing along the intended trajectory. Therefore, with a locking mechanism 50 configured in this way, it is possible to prevent erroneous operation of the locking mechanism 50 in a work machine 10 equipped with an opening / closing door 40 having the locking mechanism 50.

[0056] (2) In the work machine 10 of this embodiment, the engaging member 51 further includes an overhanging portion 57 that extends from an intermediate portion in the first direction D1, which is the direction connecting the second shaft 52 of the main body 55 and the hook portion 56, in a direction intersecting the first direction D1. The center of gravity G of the engaging member 51 is located away from the straight line of the first direction D1 that passes through the axial center position P2 of the second shaft 52. In a locking mechanism 50 with this configuration, by providing an overhanging portion 57 to adjust the position of the center of gravity G of the engaging member 51, the engaging member 51 can be naturally swung by its own weight when the door body 41 is opened from the closed state. This allows the engaging member 51 to always swing along the intended trajectory. Therefore, with a locking mechanism 50 with this configuration, it is possible to suppress erroneous operation of the locking mechanism 50 in a work machine 10 equipped with an opening / closing door 40 having a locking mechanism 50.

[0057] (3) In the work machine 10 of this embodiment, the door body 41, when rotated to a predetermined closed position, is able to contact the protruding portion 57, and rotation of the engaging member 51 beyond a first predetermined angle θ1 toward the door body 41 is restricted by contact with the door body 41. In this configuration, the locking mechanism 50 can restrict the displacement of the protruding portion 57 by the door body 41 when the door body 41 is in the closed position. In this case, the position of the engaging member 51 can be kept constant when the door body 41 is in the closed position, thereby allowing the engaging member 51 to swing along a predetermined trajectory.

[0058] (4) In the work machine 10 of this embodiment, the engaging member 51 is positioned between the opening / closing door 40 and the left-swinging cover 32 when the opening / closing door 40 is rotated to a predetermined closed position, and rotation exceeding a second predetermined angle θ2 in the direction away from the opening / closing door 40 is restricted by contact with the left-swinging cover 32. In this configuration, the locking mechanism 50 can restrict the displacement of the engaging member 51 by the left-swinging cover 32 when the door body 41 is in the closed position. In this case, the position of the engaging member 51 can be kept constant when the door body 41 is in the closed position, thereby allowing the engaging member 51 to swing along a predetermined trajectory.

[0059] (5) In the work machine 10 of this embodiment, the protruding portion 57 also serves as a gripping portion for gripping the engaging member 51 when it is rotated. With this configuration, the locking mechanism 50 does not require a separate gripping portion, thus simplifying the structure of the locking mechanism 50.

[0060] (6) In the work machine 10 of this embodiment, the hook portion 56 has a first claw portion 56a formed on the rear side in the swinging direction of the engaging member 51 when the door body 41 is rotated around the first axis 43 from a predetermined closed position to a predetermined open position, a second claw portion 56b formed on the front side, and a recess 56c formed between the first claw portion 56a and the second claw portion 56b, and in the first direction D1 which is the direction connecting the second axis 52 and the hook portion 56, the length of the first claw portion 56a is longer than the length of the second claw portion 56b. In a locking mechanism 50 with this configuration, the first claw portion 56a can easily overcome the pin 45, while the second claw portion 56b has difficulty overcoming the pin. Therefore, the locking mechanism 50 ensures that the recess 56c of the hook portion 56 that overcomes the pin 45 is reliably engaged with the pin 45. This prevents accidental locking in the locking mechanism 50.

[0061] (7) In this embodiment, the work machine 10 applies an external force to the door body 41, causing it to rotate around the first shaft 43 from a predetermined closed position to a predetermined open position, thereby causing the first claw portion 56a to move over the pin 45. When the external force is released, the pin 45 is housed in the recess 56c and the engaging member 51 engages with the pin 45. With this configuration, the locking mechanism 50 allows the user to engage the engaging member 51 and the pin 45 through natural operation of the opening and closing door 40.

[0062] (8) In the work machine 10 of this embodiment, the pin 45 is provided on the first hinge 42a. In this configuration, the locking mechanism 50 can be made compact by providing the pin 45 on the hinge 42.

[0063] The embodiments described above are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the embodiments, and includes all modifications within the scope equivalent to the configurations described in the claims. [Explanation of symbols]

[0064] 10 Work Machines 11 aircraft 40 Opening and closing doors 41 Door body 42 Hinge 43 1st axis 45 Pin (engaged member) 50 Locking mechanism 51 Engaging member 52 2nd axis 55 Main body 56 Hook section 56a First claw portion 56b Second claw portion 56c recess 57 Protruding section D1 1st direction D2 2nd direction G (center of gravity of the engaging member) θ1 First predetermined angle θ2 Second predetermined angle

Claims

1. The aircraft and, The cover that constitutes the exterior of the aircraft, A door body and a hinge having a first axis that rotatably supports the door body relative to the cover, and an opening / closing door provided on the cover, A locking mechanism capable of holding the aforementioned door open, A work machine having, The locking mechanism is A second shaft having an axis parallel to the axis of the first shaft and fixed to the door body, An engaging member supported so as to be pivotable by the second axis, The cover comprises an engaging member fixed to the cover, The aforementioned engaging member is A plate-shaped main body, The main body has an axial hole through which the second shaft is inserted, The main body portion comprises a hook portion formed at a position spaced apart from the axial hole, The second axis revolves around the first axis in accordance with the rotation of the door body around the first axis. The engaging member is oscillated around the second axis in accordance with the revolution of the second axis around the first axis. The hook portion is a work machine that engages with the engaged member when the door body is positioned in a predetermined open position.

2. The aforementioned engaging member is The present invention further comprises an overhang extending from a point midway in a first direction, which is the direction connecting the second axis of the main body and the hook portion, in a second direction intersecting the first direction, The work machine according to claim 1, wherein the center of gravity of the engaging member is located away from the straight line in the first direction that passes through the axial position of the second axis.

3. The work machine according to claim 2, wherein the door body, when rotated to a predetermined closed position, is capable of contacting the protruding portion, and rotation of the engaging member beyond a first predetermined angle toward the door body is restricted by contact with the door body.

4. The work machine according to claim 1, wherein the engaging member is positioned between the opening / closing door and the cover when the opening / closing door is rotated to a predetermined closed position, and rotation exceeding a second predetermined angle away from the opening / closing door is restricted by contact with the cover.

5. The work machine according to claim 2 or 3, wherein the protruding portion also serves as a gripping portion for gripping when the engaging member is rotated.

6. The aforementioned hook portion is The engaging member has a first claw portion formed on the rear side in the swing direction when the door body is rotated around the first axis from a predetermined closed position to a predetermined open position, a second claw portion formed on the front side, and a recess formed between the first claw portion and the second claw portion. In the first direction, which is the direction connecting the second shaft and the hook portion, the length of the first claw portion is longer than the length of the second claw portion, as described in claim 1 or claim 2.

7. The work machine according to claim 6, wherein an external force is applied to the door body, causing it to rotate around the first axis from a predetermined closed position to a predetermined open position, the first claw portion overcomes the engaged member, and when the external force is released, the engaged member is housed in the recess and the engaging member engages with the engaged member.

8. The work machine according to claim 1 or claim 2, wherein the engaged member is provided on the hinge.

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