JP2018030689A - Lifting attachment usage count counter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which automatically counts a usage count of use of a lifting accessory such as a suspension clamp for lifting a workpiece.SOLUTION: A counter device 10 has: a main body 20; a suspension ring 30 welded and fixed to the main body; a shackle 40 provided vertically movably and rotatably to the main body; and a counter unit 50 provided in front of the main body. The main body has a coil spring 23 for imparting energizing force in a direction in which the shackle is moved up together with a pressure spring 24. The counter unit increases by one and displays a count number at a counter display part 52a on detecting the shackle moving down with respect to the main body against the energizing force of the coil spring as a load equal to or larger than a predetermined value is placed on the shackle (detecting the suspension clamp being used to lift a workpiece). As the counter, a magnetic proximity drive type counter and a mechanical counter are usable.SELECTED DRAWING: Figure 4

Description

The present invention relates to an apparatus that automatically counts the number of times a hanging tool such as a hanging clamp is used to lift a workpiece.

In general, a lifting tool such as a suspension clamp (Patent Document 1) used to lift a workpiece such as a steel plate is suspended directly on a crane hook or connected to a crane hook via a connecting material such as a sling material. used.

JP-A-7-33380

When the lifting tool is cracked or cracked due to aging deterioration of the material or the like, the strength is lowered. If parts such as shackles and cams are damaged by this, there is a possibility of causing a serious accident such as dropping of a workpiece. In order to prevent such a situation, each manufacturer has established its own standards to determine the useful life from the start of use and to check every few years. Not only the number of years but also the number of times of use (the number of times that the suspension is subjected to a certain load) greatly affects. Even if the period of use is short, if there is a high frequency of use, there is a risk that a major accident will occur if it is judged whether there is any deterioration based on the service life. However, as far as the applicant knows, there is no means that can accurately grasp the total number of times of use from the start of use and the number of times of use after inspection. In order to ensure safety, it is strongly desired to develop a device that can accurately know the number of times the hanger is used.

Therefore, the problem to be solved by the present invention is to provide a lifting tool usage counter that can meet the above-mentioned demand.

In order to achieve this object, the present invention according to claim 1 includes a main body, upper locking means fixed to the main body and lockable to a crane hook, and a lower end of a shaft movable up and down with respect to the main body. It has a lower locking means that can lock the hanging ring of the lifting tool and a counter unit that is provided adjacent to the main body, and the main body is attached in a direction to move the lower locking means upward. The counter unit has a spring means for applying a force, and the counter unit detects that a load of a predetermined value or more is applied to the lower locking means and moves downward relative to the main body against the biasing force of the spring means. A hanging tool usage counter device that displays +1 the count number of the display unit.

According to a second aspect of the present invention, in the hanging device usage frequency counter device according to the first aspect, the main body has a movable body that moves up and down integrally with the lower locking means, and the counter unit is a movable body. A predetermined downward movement amount is detected.

According to a third aspect of the present invention, in the hanging tool usage counter according to the first or second aspect, the counter unit has a magnetic proximity driven counter, and a magnet integrally fixed to the movable body is the lower part. It is characterized in that a change in magnetoresistance that occurs when moving downward together with the locking means and the moving body is detected.

According to a fourth aspect of the present invention, there is provided the suspension tool usage counter according to the first or second aspect, wherein the counter has a mechanical counter, and the moving body moves downward together with the lower locking means. It is characterized by detecting the rotation that occurs.

According to a fifth aspect of the present invention, there is provided the suspension usage number counter device according to any one of the first to fourth aspects, further comprising a rotation permissible means for allowing the lower locking means to rotate with respect to the main body. Features.

According to a sixth aspect of the present invention, in the suspension tool usage counter according to any of the second to fifth aspects, the spring means includes a bottom surface of the inner diameter space of the main body and a lower surface of the upper diameter expanding portion of the movable body. A coil spring or a disc spring arranged so as to surround the shaft of the lower locking means between them.

According to the present invention, the upper locking means of the hanging tool usage counter is locked to the crane hook, and the lower locking means is directly attached to the hanging ring of a hanging tool such as a hanging clamp or via a hanging material such as a chain sling. In this state of use, when the work is lifted by the lifting tool and a load is applied, the lower locking means moves downward relative to the main body against the urging force of the spring means. Each time the amount of movement is detected, the count number of the counter display unit is displayed as +1. Therefore, it is possible to accurately and easily grasp the number of times the lifting tool has been used from any point in time, such as when it is started or after inspection, and to prevent accidents such as workpiece dropping that may occur due to deterioration of each part of the lifting tool. Thus, the safety of the hanging work is ensured.

According to the embodiment in which the movable body that moves up and down together with the lower locking means is arranged in the inner diameter space of the main body, it functions as a spring presser that presses the upper end of the spring means, and a part of the movable body protrudes from the main body to be countered. It is possible to easily perform integral connection with the operation member (magnet or the like). Further, since the moving body can move downward by a distance in which the lower end is separated from the bottom surface of the inner diameter of the main body in the no-load state, the predetermined vertical movement amount of the lower locking means can be set by appropriately setting this distance. Can be set.

By using the magnetic proximity drive type counter, direct contact between components is unnecessary, so that highly accurate operation can be ensured over a long period of time. If a mechanical counter is used, a relatively simple configuration can be realized at a low cost.

According to the embodiment in which the lower locking means is provided so as to be rotatable with respect to the main body, the work when connecting a lifting tool such as a hanging clamp directly or via a hanging material such as a sling material is not limited in directionality. Can be performed, and workability is improved.

It is a no-load state front view of the number-of-use counter device of a hanger according to one embodiment (Example 1) of the present invention. It is an unloaded state side view of the use frequency counter device of this hanging tool. It is a no load state top view of the use frequency counter device of this hanging tool. It is a partial longitudinal cross-sectional view by the cutting line of FIG. 1A-A. It is a front view (a), a top view (b), and a BB sectional view (c) of a spring presser used for the usage counter device of this hanging tool. They are a front view (a), a top view (b), and CC sectional drawing (c) of a magnet case used for the use frequency counter apparatus of this hanging tool. It is a load state front view of the use frequency counter device of this hanging tool. 7D is a partial longitudinal sectional view taken along the line D-D. FIG. It is operation | movement explanatory drawing of the use frequency counter apparatus of this hanging tool. It is explanatory drawing which shows the usage example of the use frequency counter apparatus of this hanging tool. It is explanatory drawing which shows the other usage example of the use frequency counter apparatus of this hanging tool. It is a no-load state front view of the use frequency counter apparatus of the hanger according to other embodiment (Example 2) of this invention. It is an unloaded state side view of the use frequency counter device of this hanging tool. It is operation | movement explanatory drawing of the use frequency counter apparatus of this hanging tool.

A configuration of a hanging tool usage counter device (hereinafter simply referred to as “counter device”) 10 according to an embodiment (Example 1) of the present invention will be described with reference to FIGS. 1 to 4 show a state where the counter device 10 is not loaded (no load state).

The counter device 10 includes a main body 20, a suspension ring 30 welded and fixed to the main body 20, a shackle 40 provided so as to be movable up and down with respect to the main body 20, and a counter unit provided in front of the main body 20. 50.

The main body 20 is a cylindrical body having a substantially rectangular cross section with an upper end opened, and a shackle insertion hole 21 through which the shaft portion 41 of the shackle 40 is inserted is formed at the lower end. A coil spring 23 is accommodated in the inner diameter space 22 of the main body 20. The lower end of the coil spring 23 is supported on the bottom surface of the inner diameter space 22, and the upper end is pressed by a spring presser 24.

The shape and configuration of the spring retainer 24 will be described with reference to FIGS. 1 to 4 together with FIG. 5. The spring retainer 24 has a substantially cylindrical shape having an inner diameter space 24 a through which the shackle shaft 41 can be vertically moved. The upper region 24b has a slightly larger diameter, and provides a space for inserting an oilless bush 27 described later. An enlarged diameter portion 24c is formed at the upper end of the spring retainer 24, and a coil spring accommodating portion 24d in which a coil spring 23 described later is disposed is formed below the enlarged portion 24c. The upper end enlarged diameter portion 24c has a front protrusion 24e, and a screw hole 24f is formed in the front protrusion 24e. An implantation bolt 59 is screwed into the screw hole 24f, and its head is fitted into a recess 56c of a magnet case 56 described later. The upper end of the enlarged diameter portion 24c is formed larger in diameter than the inner diameter spaces 24a, 24b, and forms a recess 24g in which a thrust needle bearing 26a described later is disposed.

Between the bottom surface of the main body inner diameter space 22 and the stepped surface of the spring retainer 24 (the lower surface of the upper end enlarged diameter portion 24c) 24h, it is accommodated and disposed in a coil spring accommodating portion 24d formed around the spring retainer 24. The coil spring 23 always applies an urging force so as to move the spring retainer 24 upward. In the no-load state shown in FIGS. 1 to 4, the bottom surface of the inner diameter space 22 of the body (the bearing retainer 29 described later in this embodiment). ) And the lower surface 24i of the spring retainer 24, but when the shackle 40 moves downward against the biasing force, the spring retainer 24 also moves downward together with the shackle 40, The lower surface 24 i is in close contact with the bottom surface of the inner diameter space 22. That is, this interval or distance X is a shackle movement stroke.

On the front side surface of the main body 20, an opening 25 for accommodating the front protrusion 24 e of the spring retainer 24 is formed. As described above, when the spring retainer 24 moves downward along with the shackle 40 by the movement stroke X against the biasing force of the coil spring 23, the front protrusion 24e is allowed to move downward in the opening 25. The opening 25 is formed to have a required length in the vertical direction. Further, since the opening 25 is formed to have an opening width that is substantially the same as or slightly larger than the width of the front protrusion 24e, the spring retainer 24 is accommodated by accommodating the front protrusion 24e in the opening 25. Is configured to be non-rotatable with respect to the main body 20 and only to move up and down integrally with the shackle 40.

As described above, the shackle 40 can move up and down with respect to the main body 20 and can rotate with respect to the main body 20. In order to realize this, the main body 20 has upper and lower thrust needle bearings 26 a and 26 b and an oilless bush 27. As described above, the upper thrust needle bearing 26 a is disposed in the upper end recess 24 g of the spring retainer 24, and allows the nut 42 fixed to the shackle shaft portion 41 to rotate smoothly with respect to the main body 20. The lower thrust needle bearing 26 b is disposed in the bottom recess (not indicated) of the inner diameter space 22 together with the round washer 28 and the bearing retainer 29, and allows the shackle shaft portion 41 to rotate smoothly with respect to the main body 20. The oilless bush 27 disposed between the shackle shaft portion 41 using the difference in diameter between the inner diameter spaces 24a and 24b of the spring retainer 24 also allows the shackle shaft portion 41 to rotate smoothly with respect to the main body 20. I have to.

The hanging ring 30 has a pair of parallel leg portions 31, 31 and a semicircular arc portion 32 connected to the upper ends of these leg portions and is formed in a substantially inverted U shape, and the lower end portions of the leg portions 31, 31 are By being welded to both side surfaces of the main body 20 (welded portions 33), the main body 20 is firmly fixed and integrated with the main body 20. As will be described later, the counter device 10 is used with the suspension ring 30 suspended from the crane hook 1.

As described above, the shackle 40 has a shaft portion 41 that is movable and rotatable in the vertical direction with respect to the main body 20, and a nut 42 is screwed to a male screw portion 41a formed at the upper end thereof. The spring pin 43 is fixed to prevent the pin from coming off. The lower end portion 44 of the shackle 40 has a substantially U-shape that opens downward. A bolt 46 is bridged between the pair of leg portions 45 and 45 and is fixed by a nut 47 and a split pin 48. As will be described later, the counter device 10 uses the suspension ring of the suspension clamp connected to the bolt 46 of the shackle 40 directly or via a link or sling material. The shackle lower end portion 44 is formed to have a slightly larger diameter than the shackle insertion hole 21 of the main body 20 and provides a stepped surface 49 (FIG. 8) between the lower end of the shackle shaft 41 and the no-load state. 1 to 4 function as a stopper for the shackle 40 that is to move upward together with the spring retainer 24 under the urging force of the coil spring 23, and the spring retainer 24, shackle 40, nut 42, magnet case 56, etc. are shown in FIGS. Hold in the position shown.

The counter unit 50 has a counter box 51 fixed by welding or the like in front of the main body 20, and a magnetic proximity drive type counter 52 is accommodated in the counter box 51. The counter 52 is fixed to a counter table 53 fixed to the upper surface of the counter box 51 via bolts 54. At least a part of the front surface of the counter box 51 is opened (or formed transparent), and the display portion 52a of the counter 52 can be visually recognized from the front surface of the counter device 10 (FIG. 1).

An opening 55 is formed on the rear surface of the counter box 51 at a position facing the front opening 25 of the main body 20, and a magnet case 56 that moves up and down together with the spring retainer 24 is accommodated in the opening 55. The shape and configuration of the magnet case 56 will be described with reference to FIGS. 1 to 4 together with FIG. 6. A screw 58 that accommodates the permanent magnet 57 in a circular recess 56a formed on the front side and is screwed into the screw hole 56b. It is fixed with. As described above, the stud bolt 59 is screwed into the screw hole 24f formed in the spring holding front projecting portion 24e accommodated in the main body front opening 25, and the head thereof is fitted in the concave portion 56c of the magnet case 56. By fitting, it moves up and down integrally with the spring retainer 24 that moves up and down together with the shackle 40. The opening 55 has an opening dimension in the vertical direction sufficient to allow the magnet case 56 to move up and down.

As will be described later with reference to FIG. 7, the permanent magnet 57 is disposed such that the magnetic proximity drive counter 52 and the N poles face each other at a distance Y. The magnet case 56 is preferably made of a stainless steel (SUS) material or an aluminum material, thereby preventing the magnetic force of the permanent magnet 57 from propagating to the main body 20, the counter box 51, etc., and demagnetizing the magnet case 56. It is possible to minimize the decrease in service life. For the same reason, it is preferable to use a stainless steel material or an aluminum material for the mounting screw 58 for attaching the permanent magnet 57 to the magnet case 56.

The operation or usage of the counter device 10 configured as described above will be further described with reference to FIGS. The counter device 10 is used by being arranged between the crane hook 1 and the suspension clamp 2 in order to grasp the number of times (the number of times of use) when the workpiece W such as a steel plate is lifted by using the suspension clamp 2. Is done. FIG. 10 shows an example in which the suspension ring 30 of the counter device 10 is suspended from the crane hook 1 and the suspension ring 3 of the suspension clamp 2 is directly connected to the shackle 40 (bolt 44). The suspension ring 30 is suspended on the crane hook 1, the suspension ring 3 of the two suspension clamps 2, 2 is attached to the shackle 40 (bolt 44), the master link 4, the sublink 5, the chain sling 7 having the couplings 6, 6 on the top and bottom, etc. The example which connects and uses through the connection material of is shown.

In such a use example, when a load of the workpiece W acts on the suspension clamp 2, a load exceeding the urging force of the coil spring 23 (self weight of the suspension clamp 2 + load of the workpiece W, for example) is applied. By moving downward in the main body inner diameter space 24, the lower surface 24 i is in close contact with the bottom surface of the main body inner diameter space 24 (the upper surface of the bearing retainer 29). At the same time, the magnet case 56 in which the head of the stud 59 is fitted in the recess 56 c also moves downward in the opening 55 formed in the rear surface of the counter box 51 together with the spring retainer 24. This state (load state) is shown in FIG. 7 and FIG. 8, and by comparing with FIG. 1 and FIG. 4 respectively, the positional changes of the spring retainer 24, shackle 40, nut 45, magnet case 56, etc. are confirmed. be able to.

In the unloaded state shown in FIGS. 1 to 4, the magnet case 56 that is integrally fixed to the spring retainer 24 positioned above by the coil spring 23 is positioned above the rear opening 55 of the counter box 51. Therefore, the permanent magnet 57 in the magnet case 56 takes a position retracted upward with respect to the magnetic proximity driven counter 52 in the counter box 51 (dotted line position in FIG. 1, FIGS. 4 and 9). As described above, the permanent magnet 57 is arranged so that the counter 52 and the N poles face each other at the interval Y. However, in the positional relationship in the no-load state, the repulsive force between the N poles as shown in FIG. Is small, the counter 52 does not operate.

However, if the spring retainer 24 is moved downward by the distance X from this positional relationship (FIGS. 7 and 8), the permanent magnet 57 also moves downward by the distance X (the phantom line position in FIG. 1). The repulsive force between the poles increases, and this is detected by the mechanism inside the counter 52. Then, when the workpiece W is grounded at a predetermined place, the load is released, and when the magnet case 56 (and the internal permanent magnet 57) together with the spring retainer 24 returns to the original upper position, the count number of the counter display unit 52a is +1 is added. In this way, when used as shown in FIGS. 10 and 11, the count number of the counter display portion 52 a is incremented by 1 each time the load of the workpiece W acts on the suspension clamp 2. The number of times can be accurately and easily grasped, and the safety of the hanging work can be ensured. For example, if the counter display unit 52a can display 6 digits, it can count up to a maximum of 1 million times.

Contrary to the magnetism shown in FIG. 9, the surface of the magnetic proximity driven counter 52 is magnetized to the S pole, and the S pole of the permanent magnet 57 is arranged so as to be opposed to each other with the interval Y. The action can be performed.

In the counter device 10 according to the first embodiment, the magnet case 56 moves downward together with the shackle 40 and the spring retainer 24 when the load is changed from the no-load state to the permanent box 57 in the magnet case 56. The counter is operated in close proximity to the magnetic proximity drive type counter 52, but the count number is +1 every time a change from the no-load state to the load state (that is, use of the suspension clamp 2). As long as it is displayed, the configuration and operation of the counter are not limited. For example, FIGS. 12 to 14 show an example (Example 2) of an embodiment in which a mechanical counter is employed.

The counter device 60 includes a main body 70, an upper suspension ring 80 that is welded and fixed to the main body 70, a lower suspension ring 90 that is vertically movable and rotatable with respect to the main body 70, and an upper suspension ring 80 above the main body 70. And the counter unit 100 attached thereto.

The main body 70 is a cylindrical body having a substantially rectangular cross section with an upper end opened, and a lower suspension ring shaft insertion hole 71 through which the shaft portion 91 of the lower suspension ring 90 is inserted is formed at the lower end. In this embodiment, the disc spring 73 is accommodated in the inner diameter space 72 of the main body 70, but a coil spring may be used as in the first embodiment. The lower end of the disc spring 73 is supported on the bottom surface of the inner diameter space 72, and the upper end is pressed by the upper end enlarged diameter portion 74 a of the spring presser 74. Similar to the first embodiment, a thrust needle bearing 75 is accommodated together with a round washer 76 and a bearing holder 77 in a recess (not indicated) formed in the bottom of the main body 70, and the lower suspension ring shaft 91 rotates smoothly with respect to the main body 70. Is possible.

Similar to the suspension ring 30 of the first embodiment, the upper suspension ring 80 has a pair of parallel leg portions 81 and 81 and a semicircular arc portion 82 connected to the upper ends of these leg portions, and is formed in a substantially inverted U shape. The lower ends of the leg portions 81 and 81 are welded to both side surfaces of the main body 70, thereby being firmly fixed and integrated with the main body 70. As will be described later, the counter device 60 is used by suspending the upper suspension ring 80 on the crane hook 1.

The lower suspension ring 90 has a lower suspension ring shaft 91 that passes through the inner diameter space (not indicated) of the spring retainer 74. Although this embodiment is formed as a hanging ring, it may have a shackle shape similar to that of the first embodiment. The lower suspension ring shaft 91 protrudes further upward through a nut 92 secured by a spring pin 93, and a connecting bar 96 attached to the upper end protrusion 94 via a cap 95 extends upward. It enters the counter box 102 (described later) of the counter unit 100. The connecting bar 96 has a substantially square cross section, and is inserted through a substantially square hole (not shown) formed in the bottom surface of the counter box 102 so that it cannot rotate. Only vertical movement is allowed.

This embodiment differs greatly from the first embodiment in that a counter unit 100 having a mechanical counter (stroke counter) 101 is mounted between the legs 81 and 81 of the upper suspension ring 80 above the main body 70. There is to be. As shown in FIG. 14, a counter box 102 is attached to legs 81, 81 with screws 103, a counter stand 105 attached to the counter box 102 with screws 104, and a display unit 106 facing the front. A formula counter 101 is arranged. The mechanical counter 101 has a lever 108 that can rotate around a horizontal counter shaft 107, and the tip of the lever 108 is rotatably connected to the upper end of the connecting bar 96 via a connecting pin 109. Reference numeral 110 denotes a protection bar attached to the leg portions 81 and 81 of the counter box 102, and a portion related to the operation of the counter 101 when the counter device 60 contacts an external structure (FIG. 14). Is protected and its predetermined operation is ensured.

The counter device 60 configured as described above is used as shown in FIG. 10 or FIG. 11 similarly to the counter device 10 of the first embodiment, and when the load of the workpiece W acts on the suspension clamp 2, Since a load exceeding the urging force of the spring 73 (self weight of the suspension clamp 2 + load of the workpiece W) is applied, the spring retainer 74 moves downward in the main body inner diameter space 72 by the distance X, and the lower surface thereof is the main body inner diameter space 24. Is in close contact with the bottom surface (the top surface of the bearing retainer 77). Since the lower suspension ring 90 also moves downward together with the spring retainer 74, the lever 108 of the mechanical counter 101 connected via the connecting bar 96 and the connecting pin 109 rotates clockwise (in FIG. 14). In FIG. 14, the positions of the lever 108 and the connecting pin 109 in the no-load state are indicated by solid lines, and the positions after moving under the load are indicated by virtual lines. That is, the downward movement of the spring retainer 24 and the lower suspension ring 90 is physically converted into the rotational movement of the lever 108 at an angle corresponding to the distance X, and the counter display unit 106 counts when this rotational amount α is detected. The number is set to be displayed as +1. As a result, in the same way as in the first embodiment, when the load of the workpiece W is applied to the suspension clamp 2 in the case where it is used as shown in FIG. 10 or FIG. The number of times the clamp 2 is used can be accurately and easily grasped, and the safety of the hanging work can be ensured.

Although the present invention has been described in detail with reference to examples, the present invention is not limited thereto, and can be implemented with various modifications and changes within the scope of the invention described in the claims. is there. In the said Example, although the example which uses the counter apparatus of this invention for the suspension clamp for steel plate lifting was demonstrated, various workpieces other than a steel plate (shape steel, a concrete block, a U-shaped groove, a manhole, a drum can, a rail, It can be used for suspension clamps of various configurations and types for lifting stone materials, etc., and can also be used for suspension tools other than clamps (hooks, coil lifters, etc.).

In the above embodiment, when the magnetic proximity drive counter 52 detects that the spring retainer 24 is moved downward by the distance X together with the shackle 40 (change from the no-load state to the load state) as a predetermined magnetic change. The counter display is incremented by 1 (Example 1), or the mechanical counter 90 detects that the lower suspension ring 90 has moved downward by a distance X (change from the no-load state to the load state) as an angle change of a predetermined amount α. Although the counter display is sometimes incremented by +1 (Example 2), the timing of incrementing the counter display by +1 differs depending on the counter mechanism used, and is not necessarily counted when a change from the no-load state to the load state is detected. The display is not limited to +1. For example, when a change from a no-load state to a load state is detected, the counter display is incremented by 0.5 (for example, if the last one digit before use is “0”, an intermediate position between “0” and “1”) The counter display is further incremented by +0.5 when the workpiece is suspended and changed from the loaded state to the no-loaded state (in the above case, “0” and “1” from the middle) It may be a counter whose display changes so that it moves to the display position of “1”. Also in this case, since the counter display is incremented by one by one use of the hanging tool such as a hanging clamp, there is no change in the effect that the number of times of use can be accurately grasped.

1 Crane hook 2 Suspension clamp
3 Suspension ring 4 Master link 5 Sub link 6 Chain sling (suspending material)
10 Lifting device usage counter 20 Main body 21 Shackle insertion hole 22 Internal space 23 Coil spring (spring means)
24 Spring retainer (moving body)
24a Inner diameter space 24b Upper region 24c Upper end enlarged portion 24d Coil spring accommodating portion 24e Front projecting portion 24f Screw hole 24g Recessed portion 24h Stepped surface (lower surface of upper end enlarged portion)
24i Lower surface 25 Openings 26a, 26b Thrust needle bearing (rotation permitting means)
27 Oiles bush (rotation permitting means)
28 Round washer 29 Bearing retainer 30 Suspension ring (upper locking means)
31 Leg 32 Semicircular arc 33 Weld 40 Shackle (lower locking means)
41 Shackle shaft 41a Male thread portion 42 Nut 43 Spring pin 44 Lower end portion 45 Leg portion 46 Bolt 47 Nut 48 Split pin 49 Stepped surface (stopper)
50 Counter Unit 51 Counter Box 52 Magnetic Proximity Driven Counter 52a Display Unit 53 Counter Stand 54 Bolt 55 Opening 56 Magnet Case 56a Circular Recess 56b Screw Hole 56c Recess 57 Permanent Magnet 58 Mounting Screw 59 Implanting Bolt 60 Lifting Tool Usage Counter 70 Main body 71 Lower suspension ring shaft insertion hole 72 Inner diameter space 73 Belleville spring (spring means)
74 Spring retainer 75 Thrust needle bearing 76 Round washer 77 Bearing retainer 80 Upper suspension ring (upper locking means)
81 Leg part 82 Semicircular arc part 90 Lower suspension ring (lower part latching means)
91 Lower suspension ring shaft 92 Nut 93 Spring pin 94 Upper end projection 95 Cap 96 Connection bar 100 Counter unit 101 Mechanical counter (stroke counter)
102 Counter box 103 Screw 104 Screw 105 Counter stand 106 Display unit 107 Counter shaft 108 Lever 109 Connecting pin 110 Protection bar

Claims (6)

A main body, an upper locking means fixed to the main body and lockable to a crane hook, and a lower locking provided at the lower end of a shaft movable up and down with respect to the main body and capable of locking a hanging ring of a lifting tool Means and a counter unit provided adjacent to the main body, the main body has spring means for applying a biasing force in a direction to move the lower locking means upward, and the counter unit has a lower locking A lifting device characterized by detecting that a load of a predetermined value or more has acted on the means and moved downward relative to the main body against the urging force of the spring means, and displays the count number of the counter display unit as +1 Usage counter device. The lifting device according to claim 1, wherein the main body has a moving body that moves up and down integrally with the lower locking means, and the counter unit detects a predetermined downward movement amount of the moving body. Time counter device. The counter unit has a magnetic proximity drive type counter, and detects a change in magnetoresistance that occurs when a magnet integrally fixed to the moving body moves downward together with the lower locking means and the moving body. The suspension tool usage frequency counter device according to claim 1 or 2. The apparatus according to claim 1 or 2, wherein the counter has a mechanical counter, and detects rotation that occurs when the movable body moves downward together with the lower locking means. Count counter. The suspension usage number counter device according to any one of claims 1 to 4, further comprising a rotation permissible means that allows the lower locking means to rotate with respect to the main body. The spring means is a coil spring or a disc spring arranged so as to surround the shaft of the lower locking means between the bottom surface of the inner diameter space of the main body and the lower surface of the upper diameter enlarged portion of the movable body. The hanging device usage frequency counter device according to any one of claims 2 to 5.

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