JP7290331B2 - head block - Google Patents

Description

The present invention relates to head blocks.

A crane for loading and unloading containers is equipped with a hoist called a spreader, and a tightening device provided on the spreader grips and lifts the container. The spreader is traversably held on a trolley mounted on the girder of the crane.
Cranes, on the other hand, often hold the spreader on a trolley via a structure called a head block in order to facilitate replacement of the spreader clamping device. The head block is a suspended body suspended by a wire from the trolley, and by connecting the spreader and the trolley, it holds the spreader detachably.
A head block and a spreader, or a spreader and a container may be connected by a structure called a twist lock as shown in US Pat. This structure has a twist lock shaft projecting toward the object to be connected, and a long hook corresponding to the long hole on the upper surface of the object to be connected. In this structure, the hook is inserted so that the longitudinal direction of the hook is aligned with the long hole, and the twist lock shaft is turned so that the longitudinal direction of the hook intersects the long hole and does not come out of the long hole. concatenate
However, if the horizontal position of the hook with respect to the long hole is shifted in the longitudinal direction after the hook is inserted, there is a risk that the hook will get caught on the upper surface of the object to be connected and will not be pulled out even if the longitudinal direction of the hook matches the long hole. Therefore, the twist lock also includes a member called a guide block that retains the horizontal relative position of the hook with respect to the slot when inserted into the slot. Like the hook, the guide block has a planar shape corresponding to the long hole, but since it is provided around the twist lock shaft vertically above the hook, when it is inserted into the long hole, it will move to the inner circumference of the long hole. The abutment holds the horizontal position of the hook relative to the slot.
As a structure of the guide block, as described in Patent Documents 2 and 3, a structure is known in which the guide block is fixed to the lower portion of the frame of the spreader by a fixing portion such as a welded portion or a bolt. Alternatively, as described in Patent Document 4, there is also known a structure in which an oscillating twist lock guide block is loosely mounted between a hook and a thrust bearing so as not to be fixed to the frame.

JP-A-2000-177976 Japanese Utility Model Laid-Open No. 61-15300 Japanese Utility Model Laid-Open No. 63-4985 Japanese Utility Model Laid-Open No. 58-56774

However, the structures of Patent Documents 2 to 4 are all guide blocks for a twist lock that grips a container, and are not suitable for the head block for the following reasons.
First, the twist lock of the head block is required to be strong enough to support both the spreader and the container. On the other hand, the outer dimensions of the guide block are determined in relation to the dimensions of the elongated hole on the spreader side, and the twist lock shaft is inserted through the guide block.
However, in Patent Documents 2 and 3, since the guide block is fixed to the frame, the horizontal cross-sectional area of the fixed portion is reduced when the guide block is thinned. Therefore, when an impact is applied to the guide block, the stress concentrated on the fixed portion increases, and the fixed portion may be damaged.
On the other hand, in the structure of Patent Document 4, when the hook receives a lateral load in the horizontal direction, the lateral load is all transmitted to the guide block via the twist lock shaft. Therefore, when the guide block is thinned, the guide block is likely to be damaged by the lateral load applied to the hook even if the guide block is not directly impacted. Therefore, the structures of Patent Documents 2 to 4 may not be able to cope with thinning of the guide block for the head block.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a head block having a structure that is resistant to damage when an impact is applied from the outside even if the thickness of the guide block is reduced.

In order to solve the above-described problems, the present invention provides a head block for holding a sling for a crane, comprising: a frame having a through hole on the lower surface; a twist-lock shaft arranged to be in contact with the inner circumference of the through-hole and rotating about a center axis in the projecting direction; It has a corresponding elongated shape in plan view, is inserted into the elongated hole, and is connected to the frame by rotating the twist lock shaft so that the longitudinal direction crosses the longitudinal direction of the elongated hole. The hook is loosely mounted around the twist lock shaft between the lower surface of the frame and the upper surface of the hook, has a planar shape corresponding to the planar shape of the long hole, and is inserted into the long hole. a guide block having a structure independent from the frame, which abuts against the inner circumference of the slot to hold the horizontal relative position of the hook with respect to the slot; and a restricting means for restricting rotation of the lock shaft about the axis, wherein the upper end of the guide block is arranged below the lower surface of the frame, and the guide block extends in the horizontal direction orthogonal to the axial direction of the twist lock shaft. A part of the load applied to the hook is transmitted from the twist lock shaft to the frame via the inner periphery of the through hole without passing through the guide block.

In the present invention, the guide block is provided between the lower surface of the frame and the hook, is held on the upper surface of the hook, and is independent of the frame.
Therefore, stress is not concentrated between the lower surface of the frame and the upper surface of the guide block when an impact is applied to the guide block.
Furthermore, even if the hook receives a lateral load, part of the lateral load is transmitted from the twist lock shaft to the frame via the inner periphery of the through hole without passing through the guide block, so even if the guide block is made thinner, The guide block is less likely to be damaged by the lateral load applied to the hook.

According to the present invention, it is possible to provide a head block having a structure that is resistant to damage when an impact is applied from the outside even if the guide block is thinned.

FIG. 1 is a front view of a crane equipped with a head block according to the present embodiment, showing cross sections of girders. FIG. 2 is a view of the head block in FIG. 1 as viewed in the direction of arrow A1; FIG. 2 is a view of the spreader of FIG. 1 as viewed in the direction of arrow A2; (a) is an enlarged view of a region R surrounded by a dashed line in FIG. 1 and is a cross-sectional view of a frame, and (b) is a view of the rotation mechanism in (a) viewed in the direction of arrow B. FIG. (a) is a view of the head block in the direction of arrow C of FIG. 4, showing a cross-sectional view of the frame; It is a figure which shows a state. (a) is a view of the guide block as seen from below, (b) is a view in the direction of arrow I in (a), and (c) is a view in the direction of arrow J in (a). (a) is a plan view of the lower surface of the frame, (b) is a GG cross-sectional view of (a), and (c) is a view of (a) viewed from the direction of arrow H. FIG. (a) is an enlarged view near the hook in FIG. 5(a), and (b) is an enlarged view near the hook in FIG. 4(a).

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.
First, a schematic configuration of a crane equipped with a head block according to this embodiment will be briefly described with reference to FIGS. 1 to 3. FIG. Here, as a crane, a wharf crane that is installed on a wharf and performs cargo handling of containers with a container ship is exemplified.

As shown in FIG. 1, the crane 1 comprises a girder 3, a trolley 5, a head block 7 and a spreader 9.
The girder 3 is a cantilever supporting a trolley 5 and held by a support structure (not shown). The girders 3 are provided with a pair of rectangular pillar-shaped girders 3a extending in the X direction in FIG. 1 and connecting portions (not shown) connecting the open ends of the girders 3a in the Y direction. A pair of rails 12 are provided along the X direction on the inclined surface of the girder 3a.
The trolley 5 is a carriage that lifts and holds the head block 7 and travels on the pair of rails 12 in the X direction. The direction in which the trolley 5 travels is also called the transverse direction.

The head block 7 is a member that detachably holds the spreader 9 and includes a frame 11 and a twist lock mechanism 13 .
The frame 11 is a rectangular structure in plan view that supports the entire head block 7 , and is lifted from the trolley 5 by a wire 14 . The wire 14 connects the trolley 5 and the head block 7 by passing over a sheave 11 a provided on the upper surface of the frame 11 and further over a sheave 5 a provided on the upper surface of the trolley 5 . The twist lock mechanism 13 is a tightening device that holds the spreader 9, and is provided at the four corners of the bottom surface of the frame as shown in FIG.

The spreader 9 is a sling for gripping and holding a container 10 to be handled, and includes a housing 15 , a movable frame 16 , a tightening device holding portion 18 and a tightening device 17 . The housing 15 is a rectangular member in plan view that holds the entire structure of the spreader 9, and as shown in FIG. . The movable frame 16 is a movable girder that adjusts the distance between the tightening devices according to the size of the container 10, and two sets of girder are protruded from both ends of the housing 15 in the Y direction. By adjusting the projected length, the movable frame 16 expands and contracts in the Y direction. The tightening device holding portion 18 is a member provided with a tightening device, and here extends in the X direction by connecting the open ends of the movable frame 16 . The tightening device 17 is a member that protrudes downward from both ends of the tightening device holding portion 18 and holds the container 10 by being connected to the upper surface of the container 10. Here, a twist lock type device is illustrated.
The above is the description of the schematic configuration of the crane 1 .

Next, details of the structure of the head block 7 will be described with reference to FIGS. 2 and 4 to 7. FIG.
As shown in FIGS. 4 and 5, the head block 7 has a frame 11 and a twist lock mechanism 13. As shown in FIG. The twist-lock mechanism 13 includes a twist-lock shaft 21 , a rotating mechanism 22 , a hook 23 , a guide block 25 and regulation grooves 27 .

As shown in FIGS. 4 and 5, the frame 11 includes a top wall 31, side walls 33, intermediate walls 35, and legs 37. As shown in FIGS.
The upper wall portion 31 is an outer wall forming the upper surface of the frame 11, and the sheave 11a connected to the wire 14 is provided on the upper surface. The side wall portion 33 is an outer wall that constitutes the side surface of the frame 11 and is provided along the outer circumference of the upper wall portion 31 . The intermediate wall 35 is a plate-shaped member that holds the upper end of the twist lock shaft 21 , is arranged below the upper wall portion 31 and is connected to the upper wall portion 31 via the side wall portion 33 . The leg portions 37 are portions that come into contact with the upper surface of the spreader 9 when the head block 7 is connected to the spreader 9. Here, as shown in FIG. It is a box-shaped wall body formed to protrude from the wall 35 . As shown in FIGS. 4 and 5, the lower surface 35a of the leg portion 37 is formed with a through hole 39 through which the twist lock shaft 21 passes.

The twist lock shaft 21 is a shaft that rotates when the head block 7 and the spreader 9 are connected and disconnected by the twist lock mechanism 13 .
The lower end of the twist lock shaft 21 is inserted through the intermediate wall through hole 61 provided in the intermediate wall 35 and the through hole 39 of the lower surface 35a of the leg portion 37, and protrudes downward from the frame 11, here in the Z direction. be. The twist lock shaft 21 rotates around the center axis in the Z direction, which is the projecting direction. The twist lock shaft 21 is arranged so as to be in contact with the inner periphery of the through hole 39 without any other member interposed between the through hole 39 and the twist lock shaft 21 .

The rotation mechanism 22 is a mechanism for swinging and rotating the twist lock shaft 21 while holding it, and as shown in FIGS. .
The sleeve 41 is a cylindrical member fixed around the upper end of the twist lock shaft 21 . As shown in FIG. 4(b), the upper end surface of the sleeve 41 and the upper end surface of the twist lock shaft 21 are connected by a connecting plate 42. As shown in FIG. Specifically, the connecting plate 42 and the sleeve 41 are connected by a pin 53 shown in FIG. 4(b). The connecting plate 42 and the twist lock shaft 21 are connected with bolts 55 . Thereby, the sleeve 41 is fixed to the twist lock shaft 21 via the connecting plate 42 .

The convex spherical washer 43 and the concave spherical washer 45 are washers for holding the twist lock shaft 21 and allowing the twist lock shaft 21 to swing in the X and Y directions. As shown in FIGS. 4 and 5, the convex spherical washer 43 is provided around the twist lock shaft 21 at the lower end of the sleeve 41 so as to project downward. The concave spherical washer 45 is provided around the intermediate wall through hole 61 on the upper surface of the intermediate wall 35 . The twist lock shaft 21 is held by the intermediate wall 35 by placing the convex spherical washer 43 on the upper surface of the concave spherical washer 45 . On the other hand, since the convex spherical washer 43 can swing with respect to the concave spherical washer 45, the twist lock shaft 21 can swing in the X direction and the Y direction in FIGS.

The drive plate 47 is a member that transmits power to rotate the twist lock shaft 21, and is a long plate-shaped member configured to be reciprocally movable in the X direction (D1 and D2 directions in FIG. 4B). . As shown in FIG. 4B, a protrusion 41a is provided on the side surface of the sleeve 41 and protrudes horizontally. Since the pin 49 is a shaft extending in the Z direction, the protruding portion 41a is pulled in the X direction via the pin 49 by moving the drive plate 47 in the X direction with an actuator or the like (not shown). As a result, the sleeve 41 and the twist lock shaft 21 rotate in directions E1 and E2 in FIG. 4(b).

The hook 23 is a retainer that holds the spreader 9 connected to the frame 11 of the head block 7 so that the spreader 9 is not unintentionally separated from the frame 11 .
As shown in FIGS. 4 and 5, the hook 23 is fixed to the lower end of the twist lock shaft 21, and as shown in FIG. Have a shape.
The front shape of the hook 23, here, the shape viewed from the X direction in FIG. 4, is an arrow shape with a chamfered side surface 71a as shown in FIG. 4(b). This is to use the chamfered portion as a guide when inserting the hook 23 into the elongated hole 8 of the spreader 9 .
The shape of the side surface of the hook 23, here, the shape viewed from the Y direction in FIG. 4, is also a shape in which the side surface 71b is chamfered as shown in FIG. 5(a). This is also to use the chamfered portion as a guide when inserting the hook 23 into the elongated hole 8 of the spreader 9 .
When connecting the spreader 9 to the head block 7, first, as shown in FIGS. 4(a) and 5(a), the hooks 23 and the long holes 8 are aligned in the same direction (here, the Y direction) and the hooks 23 are connected. is inserted into the slot 8. The depth of insertion is the depth until the upper surface of the hook 23 is positioned below the lower surface of the long hole 8 . Next, in this state, the twist lock shaft 21 is rotated by about 90° so that the longitudinal direction of the hook 23 intersects the longitudinal direction of the long hole 8 as shown in FIG. 5(b). In this state, the spreader 9 is connected to the frame 11 because the spreader 9 is caught by the inner wall of the upper wall of the housing 15 of the spreader 9 and cannot be removed from the long hole 8 even if the hook 23 is to be moved upward.

The guide block 25 is a member that abuts against the inner periphery of the elongated hole 8 in a state where the hook 23 is inserted into the elongated hole 8 to hold the relative position of the hook 23 in the horizontal direction with respect to the elongated hole 8 .
As shown in FIG. 4A, if the hook 23 is inserted into the long hole 8 with the hook 23 and the long hole 8 aligned in the longitudinal direction and the guide block 25 is not present, the hook 23 moves in the Y direction and the housing is displaced. There is a possibility that it will get caught on the top wall of 15. In this case, even if the longitudinal direction of the hook 23 matches the longitudinal direction of the long hole 8 , the hook 23 may not come off from the long hole 8 . Therefore, a planar guide block 25 corresponding to the long hole 8 is arranged above the hook 23 . As a result, when the hook 23 is inserted into the elongated hole 8, the guide block 25 abuts against the inner periphery of the elongated hole 8 to hold the position of the hook 23 relative to the elongated hole 8, and the hook 23 moves in the Y direction. prevent you from doing it.

The guide block 25 is loosely mounted around the twist lock shaft 21 between the lower surface 35 a of the frame 11 and the upper surface of the hook 23 . Loose fitting here means that the guide block 25 allows contact with the hook 23, the frame 11, and the twist lock shaft 21, but is not fixed to these members by means of bolts, welding, or the like. . Therefore, the guide block 25 is a member independent of the hook 23, the frame 11, and the twist lock shaft 21. As shown in FIG. Although the guide block 25 is placed and held on the upper surface of the hook 23, it is only in contact with the hook 23 and is not fixed. On the other hand, since the guide block 25 is provided between the lower surface 35 a of the frame 11 and the upper surface of the hook 23 , vertical movement is restricted by the lower surface 35 a of the frame 11 and the upper surface of the hook 23 . However, since the height of the guide block 25 is slightly lower than the height between the lower surface 35a of the frame 11 and the upper surface of the hook 23, it is possible to move in the Z direction by a distance corresponding to this height difference.
The distance between the lower surface 35a of the frame 11 and the upper surface of the hook 23 is longer than the depth of the long hole 8. As shown in FIG. If the distance is shorter than the depth of the long hole 8, even if the hook 23 is inserted into the long hole 8 until the lower surface 35a of the frame 11 and the upper surface of the spreader 9 come into contact with each other, the hook 23 will not contact the inner periphery of the long hole 8. This is because the hook 23 cannot rotate.

Further, since the guide block 25 is loosened around the twist lock shaft 21 , the twist lock shaft 21 restricts movement in the horizontal direction, here in the X and Y directions. However, in the guide block 25, the diameter Dt (see FIG. 6) of the insertion hole 25a through which the twist lock shaft 21 is inserted is slightly larger than the diameter of the twist lock shaft 21. It is possible to move. For example, when the convex spherical washer 43 swings with respect to the concave spherical washer 45 and the twist lock shaft 21 swings in the X and Y directions in FIGS. 4 and 5, the guide block 25 also swings in the X and Y directions. do.

If the guide block 25 is a member independent of the frame 11, even if the guide block 25 is subjected to an impact, stress is applied to the facing portion 81 between the upper surface of the guide block 25 and the lower surface 35a of the frame 11 shown in FIGS. don't concentrate
Therefore, unlike the case where the guide block 25 is fixed to the frame 11 by providing a welded portion or a bolt in the facing portion 81, even if the guide block 25 is thinned for reasons such as the diameter of the twist lock shaft 21 is increased, the shock is not caused. Not easily damaged.

Further, since the guide block 25 is provided between the lower surface 35 a of the frame 11 and the upper surface of the hook 23 , the twist lock shaft 21 is arranged so as to contact the inner periphery of the through hole 39 of the frame 11 .
With this configuration, for example, when the hook 23 comes into contact with the long hole 8 during connection work with the spreader 9, the hook 23 receives a lateral load having a component in a direction (X direction or Y direction) orthogonal to the axial direction of the twist lock shaft 21. Suppose that received In this case, part of the lateral load is transmitted from the twist lock shaft 21 to the frame 11 via the inner periphery of the through hole 39 as indicated by arrow F1 in FIG. 5(a). As a result, the lateral load is absorbed by the head block 7 as a whole. Therefore, part of the lateral load is transmitted to the frame 11 without passing through the guide block 25.
Therefore, even if the thickness of the guide block 25 is reduced due to, for example, the diameter of the twist lock shaft 21 being increased, the lateral load applied to the hook 23 does not easily damage the guide block 25 .

As shown in FIG. 6 , the guide block 25 has an insertion section 59 and a guide section 83 .
The insertion portion 59 is a member that holds the guide portion 83 and abuts against the frame 11, and is a plate-like member that extends in a predetermined direction, here the Y direction. An insertion hole 25 a through which the twist lock shaft 21 is inserted is formed in the center of the insertion portion 59 in a plan view so as to penetrate the insertion portion 59 in the plate thickness direction.
The guide portion 83 is a member inserted into the long hole 8, and is a pair of members projecting from the lower surface of the insertion portion 59 so as to face each other in the Y direction with the insertion hole 25a interposed therebetween.
The guide portion 83 has an outer shape corresponding to the inner circumference of the long hole 8 . Specifically, the pair of guide portions 83 are arranged in the insertion portion 59 so as to form a planar shape corresponding to the planar shape of the long hole 8 . For example, in FIG. 6A, a closed curve L connecting the outer circumference of the guide portion 83 in plan view has a shape corresponding to the inner circumference of the elongated hole 8 . Specifically, the closed curve L has a similar shape that is slightly smaller than the inner circumference of the elongated hole 8 .
Here, the guide portion 83 has a cylindrical shape with an open bottom in plan view. By forming the guide portion 83 into a cylindrical shape, the weight can be reduced as compared with the case where the guide portion 83 is formed into a solid columnar shape.

By configuring the guide block 25 to include the two guide portions 83 and the insertion portion 59 that holds the guide portions 83 in this manner, the width W of the guide portions 83 can be made approximately the same as the diameter Dt of the insertion hole 25a. , the thickness of the guide block 25 can be reduced without greatly lowering the strength thereof.

The restricting groove portion 27 is restricting means for restricting the guide block 25 from following the rotation of the twist lock shaft 21 and rotating around the twist lock shaft 21 when the twist lock shaft 21 rotates. These grooves are formed in the lower surface 35a of the leg portion 37 as shown in FIGS.
More specifically, as shown in FIG. 7, the restricting groove portion 27 is a groove extending in one direction (Y direction) so as to be in contact with the through hole 39 of the leg portion 37 around the projecting portion of the twist lock shaft 21. and includes a pair of wall portions 27a extending in the Y direction and facing each other. As shown in FIG. 7, since both ends 27b of the restricting groove 27 in the Y direction are open, the length Lm of the restricting groove 27 in the Y direction is the same as the length of the lower surface 35a of the leg 37 in the Y direction. be.
The width Dm of the restriction groove portion 27 shown in FIG. 7A is slightly larger than the width Ws of the insertion portion 59 shown in FIG. 6A. Therefore, by aligning the extending direction of the insertion portion 59 with the extending direction of the restriction groove portion 27 , the insertion portion 59 can be inserted into the restriction groove portion 27 . The height Hg of the guide block 25 shown in FIG. 6B is slightly lower than the height Hf between the top surface of the hook 23 and the bottom surface of the regulation groove 27 (see FIG. 4A). is. Therefore, when the guide block 25 is inserted between the lower surface 35a of the frame 11 and the upper surface of the hook 23, the insertion portion 59 is inserted into the groove portion of the regulation groove portion 27 as a convex portion. Even if the twist lock shaft 21 is rotated in this state, the insertion portion 59 contacts the wall portion 27a of the restriction groove portion 27, and the rotation of the guide block 25 is restricted. This structure is a rotation stop using the regulating groove portion 27 as a key groove and the insertion portion 59 as a key. In this structure, since the insertion portion 59 functions both as a rotation stop key and as a holding portion for the guide portion 83, the shape of the guide block 25 can be simplified compared to the case where these two functions are realized by separate members. is also advantageous.

In this structure, when the hook 23 receives a lateral load in the X and Y directions as shown in FIG. 8A, part of the X-direction component Fx of the lateral load is transmitted to the frame 11 through the insertion portion 59 of the guide block 25 and the wall portion 27a of the restriction groove portion 27. As shown in FIG. Therefore, the head block 7 receives part of the lateral load applied to the hook 23 .
However, as indicated by the arrow F1 in FIG. 8A, part of the X-direction component Fx of the lateral load passes from the twist lock shaft 21 through the inner circumference of the through hole 39 without passing through the guide block 25. is transmitted to Therefore, the guide block 25 does not receive the entire X-direction component of the lateral load.

Further, the Y-direction component Fy of the lateral load shown in FIG. 8B is not transmitted to the frame 11 via the guide block 25. This is because, as shown in FIG. 8B, the restricting groove portion 27 does not restrain the movement of the insertion portion 59 in the Y direction. Therefore, the Y-direction component Fy of the lateral load is transmitted to the frame 11 via the inner circumference of the through hole 39 without being transmitted to the guide block 25 .
In this way, the head block 7 has a structure in which only a part of the X-direction component Fx of the lateral load received by the hook 23 is transmitted to the guide block 25, so that the guide block 25 is less likely to be damaged by the lateral load.

A specific condition for not transmitting the Y-direction component Fy of the lateral load received by the hook 23 to the guide block 25 (a specific condition for not transmitting the Y-direction component Fy to the frame 11 via the guide block 25) is They are the following two. Either one of these two conditions should be satisfied.
First, as shown in FIG. 7, the first condition is that the groove portion of the restricting groove portion 27 has a groove shape in which both ends 27b in the Y direction are open. In this configuration, the restriction groove portion 27 does not have a portion that restricts movement of the insertion portion 59 in the Y direction. Therefore, the Y direction component Fy of the lateral load received by the hook 23 is not transmitted to the guide block 25 .
This configuration is advantageous in that the guide block 25 and the frame 11 do not come into contact with each other in the Y direction regardless of the length of the groove portion in the Y direction and the length of the insertion portion 59 in the Y direction.

The second condition is that the maximum length Ls in the Y direction of the insertion portion 59 shown in FIG. 6 is shorter than the length Lm in the Y direction of the restriction groove portion 27 shown in FIG. Specifically, the degree of shortening (the difference between Ls and Lm) is a value larger than the difference in diameter between the twist lock shaft 21 and the insertion hole 25a. With this configuration, even if the end portions 27b of the groove portion of the restricting groove portion 27 are not open at both ends and a wall portion is formed, the wall portion does not contact the insertion portion 59, so that the restricting groove portion 27 does not come into contact with the guide block 25. does not constrain movement in the Y direction.
With this configuration, the area of the portion of the frame 11 that is reduced in thickness due to the formation of the groove can be made smaller than in the case where both ends of the groove are open. Therefore, it is advantageous in that the strength of the frame 11 can be ensured.

In FIGS. 6 and 7, the restricting means is formed as a groove (regulating groove 27) and the insertion portion 59 is formed as a projection. You may
The above is the description of the configuration of the head block 7 .

As described above, according to this embodiment, the head block 7 includes the frame 11, the twist lock shaft 21, the hook 23, the guide block 25, and the regulation groove portion 27, and the guide block 25 is a member independent of the frame 11. .
Therefore, even if an impact is applied to the guide block 25, stress does not concentrate on the facing portion 81 between the lower surface 35a of the frame 11 and the upper surface of the guide block 25, so even if the guide block 25 is thinned, it will not be damaged by the impact. Hateful.

Further, according to this embodiment, the guide block 25 is provided between the lower surface 35a of the frame 11 and the upper surface of the hook 23, and the twist lock shaft 21 is arranged so as to contact the inner periphery of the through hole 39 of the frame 11. As shown in FIG.
Therefore, part of the lateral load received by the hook 23 is transmitted from the twist lock shaft 21 to the frame 11 via the inner periphery of the through hole 39 without passing through the guide block 25 . Therefore, the guide block 25 is less likely to be damaged by the lateral load applied to the hook 23 .

Although the present invention has been described based on the embodiments, the present invention is not limited to the embodiments. It is a matter of course that a person skilled in the art can come up with various modifications and improvements within the scope of the technical idea of the present invention, and these are also included in the present invention.
For example, in the above-described embodiment, the head block 7 that connects the spreader 9 and the trolley 5 is illustrated, but the head block 7 of the present invention can also be applied to a head block that connects the trolley 5 and the bucket.
Furthermore, the twist lock mechanism 13 provided in the head block 7 of the present invention can also be applied to the twist lock mechanism of the spreader 9 .
Alternatively, in the above-described embodiment, a wharf crane was exemplified as the crane 1, but the present invention can also be applied to a portal crane or a jib crane.

1 Crane 3 Girder 3a Girder Material 5 Trolley 5a Sheave 7 Head Block 8 Long Hole 9 Spreader 10 Container 11 Frame 11a Sheave 12 Rail 13 Twist Lock Mechanism 14 Wire 15 Housing 16 Movable Frame 17 Tightening Device 18 Tightening Device Holding Part 21 Twist Lock Shaft 22 Rotating mechanism 23 Hook 25 Guide block 25a Insertion hole 27 Regulating groove 27a Wall 27b End 31 Upper wall 33 Side wall 35 Intermediate wall 35a Lower surface 37 Leg 39 Through hole 41 Sleeve 41a Protruding portion 42 Connecting plate 43 Convex spherical surface Washer 45 Concave side spherical washer 47 Drive plate 49 Pin 53 Pin 55 Bolt 59 Insert portion 61 Intermediate wall through holes 71a and 71b Side surface 81 Opposing portion 83 Guide portion

Claims (5)

A head block for holding a crane hoist, comprising:
a frame having a through hole on its lower surface;
a twist-lock shaft inserted through the through-hole to protrude downward from the frame, disposed so as to be in contact with the inner periphery of the through-hole, and rotating about a central axis in the protruding direction;
It is fixed to the lower end of the twist lock shaft and has a long shape in a plan view corresponding to the long hole on the upper surface of the hanging tool, and is inserted into the long hole and turned in the longitudinal direction by turning the twist lock shaft. a hook that connects the hanger to the frame by crossing the longitudinal direction of the long hole;
It is loosely attached around the twist lock shaft between the lower surface of the frame and the upper surface of the hook, has a planar shape corresponding to the planar shape of the long hole, and is inserted into the long hole. a guide block having a structure independent of the frame, which abuts on the inner circumference and holds the horizontal relative position of the hook with respect to the elongated hole;
a restricting means provided on the lower surface of the frame for restricting rotation of the guide block about the twist lock shaft;
with
the upper end of the guide block is disposed below the lower surface of the frame;
A portion of the load applied to the hook in the horizontal direction orthogonal to the axial direction of the twist lock shaft is transmitted from the twist lock shaft to the frame via the inner circumference of the through hole without passing through the guide block. A head block characterized in that it is configured to be A head block for holding a crane hoist, comprising:
a frame having a through hole on its lower surface;
a twist-lock shaft inserted through the through-hole to protrude downward from the frame, disposed so as to be in contact with the inner periphery of the through-hole, and rotating about a central axis in the protruding direction;
It is fixed to the lower end of the twist lock shaft and has a long shape in a plan view corresponding to the long hole on the upper surface of the hanging tool, and is inserted into the long hole and turned in the longitudinal direction by turning the twist lock shaft. a hook that connects the hanger to the frame by crossing the longitudinal direction of the long hole;
It is loosely attached around the twist lock shaft between the lower surface of the frame and the upper surface of the hook, has a planar shape corresponding to the planar shape of the long hole, and is inserted into the long hole. a guide block having a structure independent of the frame, which abuts on the inner circumference and holds the horizontal relative position of the hook with respect to the elongated hole;
a restricting means provided on the lower surface of the frame for restricting rotation of the guide block about the twist lock shaft;
with
A portion of the load applied to the hook in the horizontal direction orthogonal to the axial direction of the twist lock shaft is transmitted from the twist lock shaft to the frame via the inner circumference of the through hole without passing through the guide block. configured to be
the restricting means is a groove or projection provided around the through-hole on the lower surface of the frame;
The guide block has a shape corresponding to the groove or projection, and has an insertion portion at the upper end that restricts rotation of the twist lock shaft around the axis by being inserted into the groove or projection. head block . 3. The head block according to claim 2, wherein the restricting means or the insertion portion has a groove shape extending in one direction and having both ends opened in the extending direction. the restricting means is a groove or protrusion extending in one direction and provided with side walls parallel to each other and capable of coming into contact with the insertion portion;
The insertion portion is a convex portion or a groove portion that has a shape corresponding to the groove portion or the convex portion and is capable of coming into contact with the side wall,
3. The head block according to claim 2, wherein the length of the protrusion in the extending direction is shorter than the length of the groove when the protrusion is inserted into the groove. the restricting means is a groove provided around the through-hole on the lower surface of the frame and extending in a predetermined direction;
The guide block is
a plate-like insertion portion that is in the form of a plate extending in the predetermined direction corresponding to the groove portion and has an insertion hole through which the twist lock shaft is inserted in the plate thickness direction and is inserted into the groove portion;
A pair of guides projecting from the lower surface of the insertion portion so as to face each other across the insertion hole in the predetermined direction, having an outer shape corresponding to the inner circumference of the long hole, and inserted into the long hole. having a department,
The head block according to any one of claims 1 to 4, wherein the pair of guide portions are arranged in the insertion portion so as to form a planar shape corresponding to the planar shape of the long hole.

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