Hook with latch
Patent Information
- Application Number
- JP2023143171
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-04
- Publication Date
- 2025-03-14
AI Technical Summary
【0018】 本発明によれば、ワイヤロープ等をフックに引っ掛ける動作を簡素化することが可能な外れ止め付きフックを提供することが可能となる。
Smart Images
Figure 2025035861000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a hook with a locking mechanism. [Background technology]
[0002] Commonly used hooks, such as the lower hook of a hoist or a sling hook, have an arm-shaped member called a hook latch at the opening of the hook to prevent the wire rope or the like from coming off. The hook latch is biased by a spring or the like in the direction of closing the opening of the hook, and prevents the loop (eye) of the wire rope hung on the hook or the like from coming off the hook.
[0003] However, when the load suspended from the hook via the wire rope lands while the hook is being lowered, the wire rope becomes unloaded and the eye may rise up inside the hook and swing due to twisting or wind. This may cause part of the eye to wrap around the outside and above the hook, leaving the eye only caught on the hook latch. If a load is applied to the wire rope again in this state, the hook latch may rotate downward and the eye may fall off the hook. This phenomenon is generally known as the "puzzle ring phenomenon" or "back slip phenomenon."
[0004] In addition, if the tip of the hook comes into contact with an obstacle from below while the hook is ascending with a suspended load, the hook latch may be pushed down against the spring force. This causes the load to stop ascending and swing wildly, which may cause the eye to fall out of the gap between the hook and the hook latch. This phenomenon is called the "hook tip getting stuck phenomenon."
[0005] Patent Document 1 discloses a hook that includes a main stopper that operates as a hook latch, a secondary stopper that is rotatably attached to the main stopper, and a secondary torsion spring that biases the secondary stopper in the direction in which the main stopper closes the hook. In such a hook, when the eye is twisted and turns around the outside of the hook, a force acts in the direction in which the eye pushes the secondary stopper downward, but the secondary stopper does not rotate downward. As a result, the main stopper attached to the secondary stopper does not rotate, and no gap is formed between the main stopper and the hook, preventing the eye from falling off the hook. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Patent No. 6350732 Summary of the Invention [Problem to be solved by the invention]
[0007] However, in Patent Document 1, it is necessary to provide two independent springs: a primary torsion spring that biases the primary stopper in a direction that blocks the opening of the hook body, and a secondary torsion spring that biases the secondary stopper, which is rotatably supported on the primary stopper, in a direction that blocks the opening of the hook body. This increases the number of parts and the associated manufacturing steps, raising the cost of the stopper mechanism.
[0008] In addition, the secondary stopper is bent at a relatively large angle so that the upper side is convex around the pivot shaft that is pivotally supported by the primary stopper. As a result, even if the secondary stopper is pulled up to open the opening to the maximum extent, it is difficult to ensure a sufficient gap between the tip of the hook body and the secondary stopper. Therefore, when hooking the wire rope between the secondary stopper and the tip of the hook body, an extra step is required to ensure that the wire rope is hooked on the inside of the tip instead of the outside, making the hooking operation cumbersome.
[0009] In addition, the diameter of the wire rope that can be hooked onto the hook body is limited to a smaller diameter than that of a hook body without a hook stopper mechanism, reducing the versatility of the hook body.
[0010] Furthermore, with the hook of Patent Document 1, when the hook is ascending with a load suspended from it and the tip of the hook comes into contact with an obstacle from below, there is a step between the secondary anti-slip device and the tip of the hook, which means that there is a risk that the load will swing significantly.
[0011] The present invention has been made in consideration of the above circumstances, and has an object to provide a hook with a stopper that can simplify the action of hooking a wire rope or the like onto the hook. [Means for solving the problem]
[0012] A hook with a fall-off prevention device according to one aspect of the present invention comprises a hook body having a base and a tip portion facing the base and forming an opening between the base and the tip portion; a main latch which is pivotally supported by the base at one end and which is rotatable between a closed position where the other end abuts against the inside of the tip portion to close the opening, and an open position where the main latch moves away from the inside of the hook body to open the opening; and a hook body pivotally supported by the main latch, which has one end extending toward the base and the other end abutting against the outside or apex of the tip portion when the main latch is in the closed position, and which is in the open position. and a biasing means for biasing the sub-latch in the direction of the main latch to the closed position via an axis that pivots the sub-latch, and as the main latch rotates from the closed position to the open position against the biasing force of the biasing means, the sub-latch also rotates about the axis, and one end of the sub-latch slides inward along the base while the other end moves away from the outside of the tip to open the opening.
[0013] In the above-mentioned invention, the other end of the main latch preferably has a flange portion that is wide in the width direction of the main latch.
[0014] In the above-mentioned invention, it is preferable that the biasing means is a torsion coil spring wound around a shaft that pivots the sub-latch, and that a single torsion coil spring biases one end of the sub-latch and the other end of the main latch against each other.
[0015] In the above-mentioned invention, the sub-latch is preferably pivotally supported on a shaft while sandwiching the left and right sides of the main latch therebetween.
[0016] In the above-mentioned invention, the sub-latch is preferably made of a wire material.
[0017] In the above-mentioned invention, it is preferable that an engagement portion is formed on the outside of the tip end with which the other end of the sub-latch engages when the main latch is in the closed position. Effect of the Invention
[0018] According to the present invention, it is possible to provide a hook with a stopper that can simplify the action of hooking a wire rope or the like onto the hook. [Brief description of the drawings]
[0019] [Figure 1A] FIG. 1A is a side view showing the configuration of a hook with a fall-off prevention device according to this embodiment. [Figure 1B] FIG. 1B is a front view showing the configuration of the hook with a fall-off prevention device according to this embodiment. [Figure 2A] FIG. 2A is a side view showing the configuration of the main latch according to this embodiment. [Figure 2B] FIG. 2B is a plan view showing the configuration of the main latch according to this embodiment. [Figure 3A] FIG. 3A is a side view showing the configuration of the sub-latch according to the present embodiment. [Figure 3B] FIG. 3B is a plan view showing the configuration of the sub-latch according to the present embodiment. [Figure 4A] FIG. 4A is a side view showing the configuration of the latch spring according to the present embodiment. [Figure 4B] FIG. 4B is a plan view showing the configuration of the latch spring according to the present embodiment. [Figure 5A] FIG. 5A is a side view showing the configuration of the hook with anti-detachment function according to this embodiment, in which the main latch is closed. [Figure 5B] FIG. 5B is a side view showing the configuration of the hook with anti-detachment function according to this embodiment, in which the main latch is partially open. [Figure 5C] FIG. 5C is a side view showing the configuration of the hook with anti-detachment function according to this embodiment, showing the main latch in a completely open state. [Figure 6] FIG. 6 is a side view showing the configuration of a hook with a fall-off prevention device according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] [Present embodiment] The hook 1 with anti-slip feature according to this embodiment will be described below with reference to the drawings. In order to maintain consistency between the drawings, arrows representing three mutually perpendicular axes, the x-axis, the y-axis, and the z-axis, are shown in all the drawings. "One end" and "the other end" refer to one side and the other in the x-axis direction, "width direction" refers to the y-axis direction, and "upper" and "lower" refer to the vertically upper and lower along the z-axis direction. In order to make it easier to understand, the axial directions are also appropriately indicated, such as "one end in the x-axis direction."
[0021] Fig. 1A is a side view showing the configuration of a hook with anti-detachment function 1 according to this embodiment. Fig. 1B is a front view showing the configuration of a hook with anti-detachment function 1 according to this embodiment. The hook with anti-detachment function 1 includes a hook body 2, a main latch 3, a sub-latch 4, and a latch spring 5.
[0022] (Hook body) The hook body 2 has an eye 21 at its upper part, which has a hole penetrating in the y-axis direction, and a curved hook shape at its lower part. The eye 21 holds the hook body 2 in a suspended state by passing a wire rope, wire chain, or the like (not shown) through it.
[0023] The hook body 2 may be used, for example, as a lower hook of a hoist or a sling hook, or for any other purpose. What is passed through the eye 21 and what is hung by the hook body 2 is not limited to a wire, and may be another sling-like or ring-like object, and there is no limitation on the material of the object that is passed through.
[0024] The hook body 2 further has a base portion 22 and a tip portion 23 which faces the base portion 22 and has an opening 24 formed between the base portion 22 and the tip portion 23 on the inner side.
[0025] Base portion 22 refers to the portion from eye portion 21 of hook body 2 downward to the portion where hook body 2 begins to curve. Tip portion 23 is located at the tip of hook body 2, which curves from base portion 22, rotates approximately 180 degrees, and extends approximately parallel to base portion 22 so as to face base portion 22. As a result, base portion 22 and tip portion 23 form an opening 24 for the wire rope 6 or the like to enter and exit hook body 2. The dimensions of opening 24 are set to be larger than the maximum diameter of a wire rope that is normally used.
[0026] In addition, the direction inside opening 24 of hook body 2 (the direction toward the side surrounded by curved hook body 2) is referred to as the inward direction, and the direction outside opening 24 is referred to as the outward direction.
[0027] (Main latch) The main latch 3 has one end (the side of the base 22 in the x-axis direction in FIG. 1A) pivoted to the base 22 by a first bolt 36, and the other end (the side of the tip 23 in the x-axis direction in FIG. 1A) is rotatable between a closing position where the opening 24 is closed and an opening position where the opening 24 is opened. The closing position is the position shown in FIG. 1A, where the other end of the main latch 3 abuts against the inside of the tip 23 of the hook body 2 to close the opening 24. The opening position is a position where the other end of the main latch 3 rotates from the inside of the tip 23 of the hook body 2 to move away from the inside of the tip 23 of the hook body 2 toward the inside of the hook body 2 and abuts against the base 22 to open the opening 24. The opening position also includes a state where the main latch 3 is slightly separated from the base 22 but rotates to such an extent that the wire rope 6 or the like can be passed through.
[0028] Therefore, the main latch 3 cannot rotate from the closed position to the opposite side to the open position, i.e., in the direction in which the other end of the main latch 3 moves away from the inside of the tip 23 to the outside of the hook body 2, with the first bolt 36 at one end as the pivot axis, because the other end abuts against the inside of the tip 23 of the hook body 2.
[0029] Here, the structure of the main latch 3 will be described with reference to Figures 2A and 2B. Figure 2A is a side view showing the configuration of the main latch 3 according to this embodiment. Figure 2B is a plan view showing the configuration of the main latch 3 according to this embodiment.
[0030] The main latch 3 is a flat plate-like member that is elongated in the x-axis direction as a whole, and has a first bolt hole 31, a second bolt hole 32, a first cutout 33, a second cutout 34, and a flange portion 35.
[0031] The first bolt hole 31 is provided at one end, which is the left side of the drawing, and is a bolt hole penetrating in the y-axis direction. The main latch 3 is pivotally supported to the base 22 of the hook body 2 by passing a first bolt 36 through the first bolt hole 31 (FIG. 1A).
[0032] The second bolt hole 32 is provided near the center of the main latch 3 and is a bolt hole that penetrates in the y-axis direction like the first bolt hole 31. The second bolt hole 32 is used to pivotally support the sub-latch 4, which will be described later, by a second bolt 37 (FIG. 1A).
[0033] As shown in Fig. 2B, the first notch 33 is provided at one end of the main latch 3 and is cut out in a substantially U-shape in the x-axis direction with an opening at one end. As shown in Fig. 1B, the first notch 33 is a space for inserting the pivot part 221 so that one end of the first notch 33 is pivotally supported by the first bolt 36 on the pivot part 221. In consideration of the smooth rotation of the main latch 3, it is preferable that the width of the first notch 33 in the y-axis direction be set larger than the thickness in the y-axis direction of the pivot part 221 of the hook body 2 that pivots one end of the main latch 3.
[0034] As shown in Fig. 2B, the second notch 34 is provided at the other end of the main latch 3 and is cut out in a generally U-shape in the x-axis direction with an opening 34a on the other end side. The second notch 34 is a space for abutting a part of the inner side of the tip portion 23 while clamping the other end of the main latch 3 when the other end abuts against the inner side of the tip portion 23 of the hook body 2 as shown in Fig. 1A.
[0035] In the closed position where the other end of the main latch 3 clamps the inside of the tip 23 of the hook body 2, further outward rotation of the main latch 3 is restricted. Therefore, by clamping a part of the tip 23 of the hook body 2 with the other end of the main latch 3, even if the wire rope 6 hooked inside the hook body 2 presses the main latch 3 in the y-axis direction, the main latch 3 is prevented from shifting in the y-axis direction. Therefore, a gap is generated between the main latch 3 and the tip 23, and it is possible to more reliably prevent the wire rope 6 from falling off.
[0036] As shown in Fig. 2B, flange portion 35 is provided at the other end of main latch 3, and is formed so that its width in the y-axis direction is larger than that of other portions of main latch 3. The dimension of flange portion 35 in the y-axis direction is set so as to be slightly larger than the dimension of hook body 2 in the y-axis direction (Fig. 1B).
[0037] The flange portion 35 is a portion against which the finger of an operator who presses the main latch 3 inwardly when rotating the main latch 3 inwardly from the closed position rests. Therefore, by setting the width of the flange portion 35 in the y-axis direction slightly larger than the width of the hook body 2, the operator can place his / her finger on the flange portion 35 without being hindered by the tip portion 23 of the hook body 2.
[0038] (Sub-latch) The sub-latch 4 is rotatably supported by the second bolt 37 of the main latch 3. When the main latch 3 is in the closed position, one end 4a of the sub-latch 4 abuts against the first inner portion 22a of the base 22, and the other end 4b of the sub-latch 4 abuts against the outside of the tip portion 23. When the main latch 3 is in the open position, the one end 4a abuts against the second inner portion 22b that is more inward than the first inner portion 22a of the base 22, and the other end 4b of the sub-latch 4 is located at a position spaced from the outside of the tip portion 23 toward the base 22. Note that when the main latch 3 is in the closed position, the one end 4a of the sub-latch 4 may abut against the vicinity of the first bolt hole 31 of the main latch 3 instead of the first inner portion 22a of the base 22, or may not abut against anywhere. However, regardless of where one end 4a of the sub-latch 4 is located when the main latch 3 is in the closed position, it is preferable that one end 4a of the sub-latch 4 extends toward the base 22 and is located in the vicinity of the first inner portion 22a of the base 22 or the main latch 3.
[0039] Regardless of the position of the main latch 3 when it is in the closed position, as soon as the main latch 3 starts to rotate from the closed position, one end 4a of the sub-latch 4 comes into contact with the first inner portion 22a of the base 22. In other words, when the main latch 3 rotates from the closed position to the open position and when it rotates from the open position to the closed position, one end 4a of the sub-latch 4 slides almost along the inner portion of the base 22 except when the main latch is near the closed position.
[0040] When the main latch 3 rotates from the closed position to the open position, the other end 4b of the sub-latch 4 rotates counterclockwise on the page about the second bolt 37. At this time, the other end 4b moves away from the state in which it abuts against the outer side of the tip portion 23 and rises outward toward the base portion 22.
[0041] Here, the structure of the sub-latch 4 will be described with reference to Figures 3A and 3B. Figure 3A is a side view showing the configuration of the sub-latch 4 according to this embodiment. Figure 3B is a plan view showing the configuration of the sub-latch 4 according to this embodiment.
[0042] The sub-latch 4 is made of a wire and is formed into a rectangular ring shape that is elongated in the x-axis direction as a whole. The sub-latch 4 has a straight portion 41, a wound portion 42, and an inclined portion 43 from the other end side.
[0043] The straight portion 41 extends in the x-axis direction, which is the longitudinal direction, and both ends in the y-axis direction are connected in a substantially U-shape at the other end (FIG. 3B). The straight portion 41 extends from a portion (wound portion 42) pivoted by the second bolt 37 of the main latch 3 to the outside of the tip portion 23 that abuts against the hook body 2 when the main latch 3 is in the closed position.
[0044] The winding section 42 is a portion in which the wire extending from the straight section 41 to one end side is wound to form a loop on the one end side from the center in the x-axis direction. The winding section 42 is formed by winding the wire once, and is provided on both sides in the width direction of the sub-latch 4, which is the y-axis direction. The winding section 42 has two loops formed by winding the wire so as to penetrate the center in the y-axis direction. The two loops are arranged on both sides in the width direction of the winding section 42, and are pivotally supported to be rotatable on the main latch 3 through the second bolt 37 (FIG. 1B). The number of turns wound in the winding section 42 is set to a degree that provides sufficient strength to be pivoted on the second bolt 37. As the number of turns increases, the strength against the relative shift in the width direction between the sub-latch 4 and the main latch 3 increases, but the dimension in the width direction of the sub-latch 4 increases, so in this embodiment, it is described as being wound only once. However, it may be wound two or more times as long as there is no problem with the dimension in the width direction of the sub-latch 4.
[0045] The inclined portion 43 extends in the x-axis direction from the wound portion 42 to one end side, and is inclined from the straight portion 41 starting from the wound portion 42. The inclination angle with respect to the straight portion 41 is appropriately set together with the length so that the main latch 3 and the sub-latch 4 can rotate in cooperation with each other.
[0046] The inclined portion 43 is disposed such that both ends in the y-axis direction are connected in a substantially U-shape at one end (FIG. 3B). At one end of the inclined portion 43, the wires extending from both ends in the y-axis direction of the inclined portion 43 face each other with a gap 44 between them without being connected.
[0047] Since the sub-latch 4 is made of wire, the straight portion 41, the wound portion 42, and the inclined portion 43 are formed by processing a single piece of wire. The gap 44 is a portion where the start and end of the wire face each other. This allows for lower costs than forming the sub-latch 4 from a single square ring-shaped member without the gap 44.
[0048] Furthermore, as described above, one end 4a of the sub-latch 4 slides on the inner side of the base 22 when the main latch 3 rotates. At this time, friction occurs between one end 4a of the sub-latch 4 and the base 22, but because the wire rods at the inclined portion 43 of the sub-latch 4 face each other with a gap 44 between them, both wire rods in the width direction on either side of the gap 44 can elastically deform. This allows one end 4a of the sub-latch 4 to slide while smoothly following the inner side of the base 22 when the main latch 3 rotates. This allows the main latch 3 to rotate more smoothly.
[0049] (latch spring) The latch spring 5, like the sub-latch 4, is rotatably supported by a second bolt 37 inserted into the second bolt hole 32 of the main latch 3. The latch spring 5 constantly biases the sub-latch 4 so that the sub-latch 4 rotates clockwise on the page of FIG. 1A.
[0050] Since the sub-latch 4 can rotate independently of the main latch 3, when the sub-latch 4 is biased as described above, the sub-latch 4 receives a biasing force in the direction in which the main latch 3 opens, via the second bolt 37, with one end 4a of the sub-latch 4 and the abutting portion of the first inside portion 22a as a fulcrum. However, since the other end of the main latch 3 abuts against the inside of the tip portion 23, it cannot rotate any further in the opening direction. As a result, the main latch 3 is fixed in the closing position in which it closes the opening 24, as shown in FIG 1A, unless an external force is applied.
[0051] Here, the structure of the latch spring 5 will be described with reference to Figures 4A and 4B. Figure 4A is a side view showing the configuration of the latch spring 5 according to this embodiment. Figure 4B is a plan view showing the configuration of the latch spring 5 according to this embodiment.
[0052] The latch spring 5 is a torsion coil spring 5 serving as a biasing means made of wire. The torsion coil spring 5 has a coil portion 51, a first arm portion 52, and a second arm portion 53. Note that in this embodiment, a double torsion spring in which two torsion coil springs 5 are connected in parallel is used, but since a double torsion spring is sometimes referred to as a torsion coil spring 5, the term "torsion coil spring 5" will be used in the description, which is a higher-level concept.
[0053] The coil portion 51 is a portion in which a wire is wound to form a coil. The number of turns of the wire is appropriately set according to the required biasing force. Two coil portions 51 are arranged in parallel in the width direction of the torsion coil spring 5, which is the y-axis direction. Therefore, it is preferable that the number of turns is the same between the two coil portions 51 so that biasing force is not generated between them.
[0054] The first arm 52 has two linear straight portions extending from the outer sides in the y-axis direction of each of the two coil portions 51 toward one end side in the x-axis direction. The first arm 52 has a substantially U-shaped form in which the linear portions are connected by a linear bridge portion extending in the y-axis direction from one end side of each of the linear portions.
[0055] The second arm portions 53 are two linear portions extending from the inner side in the y-axis direction of each of the two coil portions 51 toward the other end side in the x-axis direction.
[0056] The latch spring 5 is configured as described above, and the coil portion 51 is rotatably supported by the second bolt 37 .
[0057] The first arm 52 comes into contact with the underside of one end of the inclined portion 43 of the sub-latch 4 in the x-axis direction, and urges that portion upward in the z-axis direction. As a result, the first arm 52 urges the sub-latch 4 in a direction that always rotates clockwise around the first bolt 36 as an axis on the paper surface of FIG. 1A.
[0058] The second arm portion 53 abuts on the lower surface of the main latch 3 in the z-axis direction, between the second bolt hole 32 and the flange portion 35. As a result, the second arm portion 53 always biases the main latch 3 in a counterclockwise rotation direction about the first bolt 36 as an axis on the paper surface of FIG. 1A.
[0059] [Operation] Next, the operation of the hook 1 with latch will be described with reference to FIGS. 5A, 5B and 5C.
[0060] Fig. 5A is a side view showing the configuration of the hook with anti-detachment mechanism 1 according to this embodiment, with the main latch 3 in a closed state. Fig. 5B is a side view showing the configuration of the hook with anti-detachment mechanism 1 according to this embodiment, with the main latch 3 in a partially open state. Fig. 5C is a side view showing the configuration of the hook with anti-detachment mechanism 1 according to this embodiment, with the main latch 3 in a completely open state.
[0061] In Fig. 5A, the main latch 3 is in a completely closed position, and no external force is applied. In this state, the main latch 3 is pressed toward the inside of the tip 23 by the second arm 53 of the latch spring 5. However, the second notch 34 of the main latch 3 cannot rotate clockwise beyond the tip 23 on the page, so the opening 24 of the hook body 2 is completely closed.
[0062] In the sub-latch 4, one end of the inclined portion 43 is pressed against the inner side of the base 22 by the first arm 52 of the latch spring 5. At the same time, the tip of the straight portion 41 of the sub-latch 4 as an integral member is pressed against the outside of the tip 23 of the hook body 2. As a result, the biasing force of the latch spring 5 acts in a direction to rotate the main latch 3 counterclockwise on the paper surface of FIG. 5A via the second bolt 37 of the main latch 3 that pivots the sub-latch 4. Note that, in a state in which the tip of the straight portion 41 of the sub-latch 4 is pressed against the outside of the tip 23 of the hook body 2, one end of the inclined portion 43 does not necessarily have to be pressed against the inner side of the base 22. In other words, the tip of the straight portion 41 of the sub-latch 4 moves while sliding against the tip 23 of the hook body 2 until one end of the inclined portion 43 is pressed against the inner side of the base 22.
[0063] In Fig. 5B, the main latch 3 is in a position between a fully closed closed position and a fully open open position. In Fig. 5A, when the flange portion 35 of the main latch 3 is pressed downward by an operator's finger or the like, the main latch 3 rotates clockwise on the page against the biasing force of the latch spring 5.
[0064] At this time, the main latch 3 rotates about the first bolt 36, and in conjunction with this, the sub-latch 4 also rotates about the second bolt 37 of the main latch 3. The sub-latch 4 slides along the inner portion of the base 22 from a state in which one end is pressed against the first inner portion 22a of the base 22 toward the second inner portion 22b.
[0065] That is, the sub-latch 4 rotates counterclockwise at the same time that the main latch 3 rotates clockwise. The main latch 3 and the sub-latch 4 are connected by the second bolt 37 and are each biased by the latch spring 5, so there is no backlash in any of the components and the state shown in Figure 5B is uniquely determined.
[0066] In Fig. 5C, the main latch 3 is in a fully open position, and the sub-latch 4 is also fully open. In the state shown in Fig. 5B, when the gap between the other end of the straight portion 41 of the sub-latch 4 and the tip portion 23 of the hook body 2 becomes larger than the diameter of the wire rope 6 to be hooked on the hook body 2, the operator pulls the wire rope 6 into the hook body 2.
[0067] Then, even if the flange portion 35 of the main latch 3 is not pressed down by the operator's finger or the like, the wire rope 6 becomes clamped between the main latch 3 and the tip portion 23 of the hook body 2, and the rotation angle of the main latch 3 is maintained.
[0068] Thereafter, the wire rope 6 rotates the main latch 3 clockwise on the paper surface of Fig. 5C by the operator pulling the wire rope 6 into the inside of the hook body 2, or by the weight of the wire rope 6. At this time, the sub-latch 4 rotates counterclockwise, similar to the state shown in Fig. 5B.
[0069] When the wire rope 6 is no longer in contact with the main latch 3, the main latch 3 rotates due to the biasing force of the latch spring 5 and the other end is pressed against the inside of the tip portion 23, and the sub-latch 4 rotates due to the biasing force of the latch spring 5 and is pressed against the tip portion 23.
[0070] 5A, 5B, and 5C, first, the worker presses down flange 35 of main latch 3 with his / her finger and rotates it clockwise. Next, when the gap between sub-latch 4 and tip 23 becomes larger than the diameter of wire rope 6, the worker pulls wire rope 6 into hook body 2 through the gap and releases his / her finger from flange 35.
[0071] Next, the wire rope 6 is pulled into the hook body 2 until the main latch 3 starts to rotate in a direction returning to the inside of the tip 23 due to the biasing force of the latch spring 5. Depending on the relationship between the weight of the wire rope 6 and the spring constant of the latch spring 5, the final operation of pulling the wire rope 6 into the body may not be necessary.
[0072] When removing the wire rope 6 hooked on the hook body 2 from the hook body 2, the worker presses down the flange portion 35 of the main latch 3 to move the main latch 3 toward the open position as shown in the order of Figures 5A, 5B, and 5C. When the gap between the main latch 3 and the hook body 2 becomes larger than the diameter of the wire rope 6, the worker pulls up the wire rope 6 from the hook body 2 and pulls it outward from the tip portion 23.
[0073] Once the worker has pulled up the wire rope 6 until it is positioned between the main latch 3 and the hook body 2, there is no need for the worker to thereafter press down the flange portion 35 of the main latch 3. After the wire rope 6 is clamped between the main latch 3 and the hook body 2, the wire rope passes between the main latch 3 and the hook body 2 and is released from the tip portion 23 simply by pulling up the wire rope 6.
[0074] The operation of the hook 1 with a locking device has been described above, along with the procedure for the worker. When the wire rope 6 is retracted into the hook body 2 as described above and a load is suspended via the wire rope 6, the main latch 3 is in the closed position (FIG. 5A).
[0075] For example, when the hook 1 with a locking device is used as the lower hook of a hoist (not shown), the lower hook descends together with the wire rope 6 in the state shown in Fig. 5A. When the load lands, the wire rope 6 is placed in an unloaded state, and the eye 61, which is the loop portion of the wire rope 6 hooked on the hook body 2, may rise up within the hook body 2, particularly toward the tip 23.
[0076] The raised eye 61 sways due to twists in the wire rope 6 or wind, and a part of the eye 61 wraps around above the hook body 2. At this time, since the sub-latch 4 is disposed higher than the main latch 3 near the tip 23, the eye 61 is caught only by the sub-latch 4.
[0077] In this state, when the lower hook rises and a load is applied to the wire rope 6 again, the load acts on the sub-latch 4 in a direction that rotates it downward via the eye 61. However, one end 4a of the sub-latch 4 is in contact with the first inner portion 22a of the base portion 22, and the other end is in contact with the outside of the tip portion 23.
[0078] As a result, the sub-latch 4 does not rotate even when a load is applied, and maintains the state shown in Fig. 5A, so that the main latch 3 does not rotate, remaining in contact with the inside of the tip 23. The eye 61 that has wrapped around the upper part of the sub-latch 4 slides downward on the sub-latch 4 under the load of the suspended load, moving downward from the tip 23, and the eye 61 returns to its original position (Fig. 5A).
[0079] Therefore, even if the so-called “puzzle phenomenon” occurs in which the eye 61 of the wire rope 6 rises above the hook body 2, the main latch 3 does not rotate, so that the wire rope 6 can be prevented from falling off the hook body 2.
[0080] Even if the eye 61 moves upward rapidly and reaches above the main latch 3 and above the second bolt 37, the sub-latch 4 has one end 4a abutting against the first inner portion 22a of the base 22 and the other end abutting against the outside of the tip portion 23, and is connected to the main latch 3 via the second bolt 37, so the main latch 3 will not rotate downward. When a load is applied again, the eye 61 slides downward via the main latch 3 and the sub-latch 4, and returns from the tip portion 23 to the hook body 2. Therefore, regardless of the state of the "puzzle ring phenomenon," it is possible to prevent the main latch 3 from rotating and the wire rope 6 from falling off.
[0081] [Variations] In the above embodiment, when the main latch 3 is in the closed position, the sub-latch 4 abuts against the outside of the tip 23 of the hook body 2, but as shown in Fig. 6, the shape of the tip 23 may be changed so that the outside of the tip 23 has a bulging portion 23a as an engagement portion that bulges outward. In this case, the configuration differs from the above embodiment in the shape of the tip 23 and the length of the sub-latch 4. Note that the length of the sub-latch 4 does not necessarily have to be changed depending on the shape of the tip 23.
[0082] In the hook body 2 having the bulge 23a at the tip 23, when the main latch 3 is in the closed position, the inside of the other end of the sub-latch 4 moves downward over the bulge 23a and engages with it. As a result, the sub-latch 4 is fixed to the tip 23 and does not move away from the tip 23, and the main latch 3 is fixed in the closed position, so that the main latch 3 can be more reliably prevented from rotating and the wire rope 6 from falling off.
[0083] When an operator presses down the main latch 3 and rotates it to the open position, an operation for disengaging the other end of the sub-latch 4 from the bulging portion 23a is required.
[0084] That is, in this modified example, when an operator hooks the wire rope 6 onto the hook body 2, the operator releases the engagement of the sub-latch 4 with the bulge 23a and pushes the main latch 3 downward with a finger or the like to rotate it toward the open position, which automatically rotates the sub-latch 4.
[0085] [effect] According to the above embodiment, the following effects are achieved.
[0086] The torsion coil spring 5 biases the sub-latch 4, thereby biasing the main latch 3 in the direction of the closed position via the second bolt 37 that pivots the sub-latch 4, so there is no need to separately provide a torsion coil spring 5 that rotates the sub-latch 4 and a torsion coil spring 5 that biases the main latch 3. This makes it possible to prevent an increase in the number of parts and the associated increase in manufacturing processes from increasing the cost of the anti-detachment mechanism.
[0087] Furthermore, as the main latch 3 rotates from the closed position to the open position against the biasing force of the torsion coil spring 5, the sub-latch 4 also rotates about the second bolt 37, and the other end of the sub-latch 4 moves away from the outside of the tip portion 23 to open the opening 24, so that the main latch 3 and the sub-latch 4 can be rotated in opposite directions at the same time. This ensures a sufficient gap between the sub-latch 4 and the tip portion 23 of the hook body 2 when the main latch 3 is opened. Therefore, when the wire rope 6 is hooked between the sub-latch 4 and the tip portion 23, the wire rope 6 can be easily hooked on the inside of the tip portion 23, and the hooking operation can be prevented from becoming complicated.
[0088] Furthermore, as described above, by ensuring a sufficient gap between the sub-latch 4 and the tip 23, the diameter of the wire rope 6 that can be hooked to the hook body 2 is not limited to a small diameter compared to a hook without an anti-slip mechanism, and the versatility of the hook body 2 is not reduced.
[0089] Furthermore, when hooking the wire rope 6 onto the hook body 2 with the main latch 3 in the closed position, the operator simply presses down the flange portion 35 of the main latch 3 from the closed position to the open position, and the sub-latch 4 rotates upward in conjunction with the rotation of the main latch 3. Therefore, of the two members constituting the hook stopper, the main latch 3 and the sub-latch 4 which prevents the main latch 3 from being pressed down by the wire rope 6, only the main latch 3 can be operated to hook the wire rope 6 onto the hook body 2 without operating the sub-latch 4, thereby preventing the operation of hooking the wire rope 6 from becoming complicated.
[0090] Furthermore, if only the main latch 3 is operated, the sub-latch 4 will rotate in conjunction with the rotation of the main latch 3, so compared to operating two components, the main latch 3 and the sub-latch 4, it is possible to reduce operational errors and forgetting to operate, thereby reducing the burden on the operator.
[0091] Furthermore, when the main latch 3 is in the closed position, the other end of the sub-latch 4 abuts against the outside of the tip 23 of the hook body 2. Therefore, even if the wire rope 6 hooked to the hook body 2 wraps around the upper side of the sub-latch 4 due to an unloaded state or the like, a so-called puzzle phenomenon occurs, the sub-latch 4 supports the wire rope 6, thereby preventing the main latch 3 from rotating in the opening direction.
[0092] Furthermore, because the other end of the sub-latch 4 abuts against the outside of the tip 23 of the hook body 2, there is no step above the sub-latch 4, so the wire rope 6 that has wrapped around the top of the sub-latch 4 slides on the sub-latch 4 and moves downward from the other end of the sub-latch 4 without coming into contact with the tip 23. As a result, the wire rope 6 returns to its original position before it was twisted, making it possible to more reliably prevent the wire rope 6 from falling off due to the puzzle phenomenon.
[0093] Furthermore, the only mechanism for preventing the wire rope 6 from falling off from the hook body 2 is the main latch 3 pivotally supported on the base 22 of the hook body 2, so that an existing hook latch in which the latch is similarly pivotally supported on the base 22 can be easily replaced with the hook with a stopper of this embodiment. As a result, since there is no need to change the shape of the hook body 2 or perform additional work, the hook with a stopper of this embodiment can be applied to widely used general-purpose products, and the function of preventing the wire rope 6 from falling off can be strengthened at low cost.
[0094] Furthermore, when the hook body 2 is ascending with a load suspended from it and tip portion 23 of the hook body 2 is about to come into contact with an obstacle from below, the obstacle abuts against the sub-latch 4 instead of the hook body 2, preventing the obstacle from sliding on the sub-latch 4 which has no steps and getting caught on the hook body 2. This prevents the hook body 2 from getting caught on an obstacle and swinging significantly.
[0095] The main latch 3 has a flange portion 35 at the other end that is wide in the axial direction of the main latch 3, so that when an operator presses down the other end of the main latch 3 to hook the wire rope 6 onto the hook body 2, the area of contact with the finger becomes larger, making it easier to press down the main latch 3. This makes it easier to perform the task of hooking the wire rope 6. In addition, it is possible to prevent the finger from coming off the main latch 3 while pressing down the main latch 3, causing the main latch 3 to return to the closed position, thereby preventing the task from becoming complicated due to double work.
[0096] The main latch 3 and the sub-latch 4 are biased by the torsion coil spring 5 wound around the pivot shaft of the sub-latch 4, so the torsion coil spring 5 can be housed integrally with the main latch 3 and the sub-latch 4. This makes it possible to make the entire structure of the hook with anti-detachment mechanism 1 simpler and more compact than when a spring is provided on the outside of the main latch 3 and the sub-latch 4. In addition, because the torsion coil spring 5 is a commonly used, general-purpose product, the cost of the hook with anti-detachment mechanism 1 can be reduced.
[0097] In addition, the main latch 3 and the sub-latch 4 mutually bias one end of the sub-latch 4 and the other end of the main latch 3 by a single torsion coil spring 5, thereby reducing the number of parts and lowering costs, and making the entire structure of the hook with anti-detachment device 1 even simpler and more compact.
[0098] Since the sub-latch 4 is pivoted to the second bolt 37 while sandwiching both the left and right sides of the main latch 3, in the event that the wire rope 6 hangs down above the main latch 3 and sub-latch 4 due to the puzzle ring phenomenon, the load from the wire rope 6 acts mainly on the sub-latch 4 which is on the outer side in the width direction. As a result, the sub-latch 4, whose rotation in the direction in which the main latch 3 opens is restricted, does not rotate even when it receives the load of the wire rope 6, making it possible to more reliably prevent the puzzle ring phenomenon.
[0099] In this embodiment, in which the sub-latch 4 is disposed widthwise outboard of the main latch 3, it is necessary to form a space inside the sub-latch 4 to accommodate the main latch 3. However, if the sub-latch 4 is made of wire, the shape can be formed more freely, making it easier to process, reducing costs and making the latch lighter.
[0100] Furthermore, one end of the sub-latch 4 slides against the inner side of the base 22 of the hook body 2 as the main latch 3 rotates. Thus, by forming the sub-latch 4 from a wire material, it is possible to improve the sliding between the sub-latch 4 and the inner side of the base 22 and reduce friction. This allows the main latch 3 to rotate more smoothly, improving operability for the worker.
[0101] The tip 23 of the hook body 2 has a bulging portion 23a that bulges outward, and when the main latch 3 is in the closed position, the other end of the sub-latch 4 can be engaged with the bulging portion 23a. As a result, even if a puzzle phenomenon occurs due to twisting of the wire rope 6, causing the wire rope 6 to come into contact with the flange portion 35 of the main latch 3 and causing the main latch 3 to receive a force in the opening direction, the upward rotation of the sub-latch 4 is restricted, and therefore the rotation of the main latch 3 in the opening direction is also restricted. This makes it possible to more firmly prevent the wire rope 6 from falling off the hook body 2.
[0102] The above-mentioned embodiments each show a preferred specific example of the present invention. The numerical values, components, arrangement positions of the components, and order of connection forms shown in the above-mentioned embodiments are merely examples and are not intended to limit the present invention. Also, each drawing is not necessarily a strict illustration.
[0103] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments.
[0104] For example, in the above embodiment, a flange portion 35 is provided on the other end of the main latch 3 to make it easier for the operator to press down the main latch 3, but the flange portion 35 may be omitted if it does not impair the operability of the operator.
[0105] In the above embodiment, a torsion coil spring is used as the latch spring 5, but a different type of spring may be used as long as it exerts a similar biasing force, or an elastic body other than a spring may be used.
[0106] Furthermore, in the above embodiment, the sub-latch 4 is disposed on the outside of the main latch 3, but conversely, the sub-latch 4 may be disposed on the inside of the main latch 3. If the main latch 3 is disposed on the outside, operability by the operator can be ensured even without providing a flange portion 35 on the other end of the main latch 3.
[0107] Furthermore, in the above embodiment, the sub-latch 4 is made of a wire material, but the present invention is not limited to this, and the sub-latch 4 may be formed by forging, casting, pressing, or the like.
[0108] Furthermore, in the above embodiment, the sub-latch 4 is formed in a square ring shape, but it may not be ring-shaped and may be composed of a plurality of members.
[0109] Furthermore, in the above modified example, the bulging portion 23a is configured as a bulging portion of the tip portion 23, but a protrusion or a notch may be provided on the outside of the tip portion 23 so that the sub-latch 4 can engage with it.
[0110] Furthermore, a cylindrical member may be attached to the bridge portion of the first arm portion 52 of the sub-latch 4 so as to be rotatable relative to the bridge portion. [Explanation of symbols]
[0111] 1 Hook with locking mechanism 2 Hook body 3 Main Latch 4 Sub-latch 5 Torsion coil spring (biasing means) 22 Base 22a First inner part 22b Second inner part (inner part) 23 Tip 23a Swelling part (engaging part) 24 Opening 24a opening 34 Second notch 35 Flange section 37 Second bolt (axis) 44 Gap
Claims
1. a hook body having a base and a tip portion facing the base and forming an opening between the tip portion and the base; a main latch having one end pivotally supported on the base and the other end rotatable between a closing position where the opening is closed by the main latch abutting against the inside of the tip portion to an opening position where the main latch is moved away from the inside of the hook body to open the opening; a sub-latch pivotally supported by the main latch, one end of which extends toward the base and the other end of which abuts against the outer side or apex of the tip when the main latch is in the closed position, and one end of which abuts against the inner side of the base and the other end of which is spaced apart from the outer side of the tip when the main latch is in the open position; a biasing means for biasing the sub-latch so as to bias the main latch in a direction toward the closed position via a shaft that supports the sub-latch; Equipped with As the main latch rotates from the closed position to the open position against the biasing force of the biasing means, the sub-latch also rotates about the axis, and one end of the sub-latch slides inward along the base while the other end of the sub-latch moves away from the outside of the tip end to open the opening. A hook with a locking mechanism.
2. The hook with anti-detachment mechanism according to claim 1, The other end of the main latch has a flange portion that is wide in the width direction of the main latch. A hook with a locking mechanism.
3. The hook with anti-detachment mechanism according to claim 1, The biasing means is a torsion coil spring, which is wound around the shaft that pivots the sub-latch, The single torsion coil spring biases one end of the sub-latch and the other end of the main latch against each other. A hook with a locking mechanism.
4. The hook with anti-detachment mechanism according to claim 1, The sub-latch is pivotally supported on the shaft while sandwiching the left and right sides of the main latch. A hook with a locking mechanism.
5. The hook with anti-detachment mechanism according to claim 1, The sub-latch is formed from a wire material. A hook with a locking mechanism.
6. The hook with anti-detachment mechanism according to claim 1, An engagement portion is formed on the outer side of the tip end with which the other end of the sub-latch engages when the main latch is in the closed position. A hook with a locking mechanism.
Citation Information
Patent Citations
Method of conducting high-pressure test of solid pressure sensor
JP1988050732A