JP2688159B2 - Overload detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a set load excess detection device.

[0002]

2. Description of the Related Art In a winch or the like, a tubular casing and a tubular casing are slidable in order to detect whether the load exceeds a predetermined load, that is, whether it is an overload. A core that is inserted and projects outward from one end of the tubular casing, and the amount of protrusion of the core increases as the outward load acting on the other end of the tubular casing and the projecting tip of the core increases. A spring member is inserted between the casing and the core so as to increase, and it is located inside the casing when these outward loads do not act, and when the outward load exceeds the set load, the set load that is exposed to the outside from one end of the casing An overload detection device in which an excess mark is formed on the outer peripheral surface of a core is known (Japanese Patent Laid-Open No. 1-271394).
Reference).

This overload detection device comprises a warning scale for warning that the set load excess mark is overloaded and a notice scale for notifying that the warning scale is approaching, and the load applied to the winch is increased to be predetermined. When the predetermined constant load is exceeded, the notice scale is first exposed to the outside, and when the load further increases and exceeds a predetermined constant load, the warning scale is exposed to the outside.

[0004]

By the way, in order to detect whether or not the load applied to the winch is overloaded, it is determined whether or not the load applied to the winch exceeds a certain load as in the above-mentioned overload detection device. It is enough to detect. However, in reality, there are cases where it is desired to change the load to be detected in various ways, that is, when the set load excess mark is exposed to the outside. However, the above-mentioned overload detection device has a problem that the load to be detected is fixed in advance because it is intended to detect an overload, and thus the load to be detected cannot be variously changed. .

[0005]

In order to solve the above problems, according to the present invention, a cylindrical casing and a set load selecting member mounted on one end of the casing so as to be movable in the axial direction of the casing. An adjusting member and a core that is slidably inserted in the casing in the axial direction of the casing and penetrates the adjusting member and projects outward from the adjusting member. The other end of the casing and the protruding tip of the core are provided. A spring member is inserted between the casing and the core so that the amount of protrusion of the core increases as the outward load acting on the and the outer load increases. Is formed on the outer peripheral surface of the core, the mark exceeding the set load that is exposed to the outside from the adjusting member when the set load determined by the moving amount of the adjusting member is exceeded.

Further, according to the present invention, in order to solve the above-mentioned problems, a tubular casing, a core movably inserted in the casing in the axial direction of the casing and protruding from one end of the casing to the outside, a core Is provided on the core so as to be movable in the axial direction and has a set load selection adjusting member partially protruding from one end of the casing, and acts on the other end of the casing and the protruding tip of the core. The spring member is inserted between the casing and the core so that the protrusion amount of the core increases as the outward load increases, and when these outward loads do not act, the spring member is located inside the casing and the outward load is adjusted. A set load excess mark that is exposed to the outside from one end of the casing is formed on the outer peripheral surface of the adjustment member when a set load determined according to the movement amount of the above is exceeded.

[0007]

According to the first aspect of the present invention, when the adjusting member is moved relative to the casing in the axial direction of the casing, the load when the set load excess mark is exposed to the outside changes, and the invention according to the second aspect Then, when the adjustment member is moved relative to the core in the axial direction of the core, the load when the set load excess mark is exposed to the outside changes.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of how to use the set load excess detection device according to the present invention. Referring to FIG. 1, a chain 2 having a hook 3 is connected to the upper end portion of the set load excess detection device 1, and the hook 3 is, for example, a fixed wall 4.
It is hooked on the hooking member 5 fixed to the. On the other hand, the lower end of the set load excess detection device 1 is connected to a hoist body 6b of a manual hoist 6 having a manual lever 6a. The manual hoist 6 comprises a chain 8 with a hook 7 on which, for example, a load 9 is hung.
When the manual lever 6a is repeatedly rocked, the chain 8 is wound up, and thus the load 9 is lifted. At this time, the load applied to the manual hoist 6 and the self-weight of the manual hoist 6 are applied to the set load excess detection device 1, but the self-weight of the manual hoist 6 is considerably smaller than the load applied to the manual hoist 6 and should be ignored. Can
Thus, the set load excess detection device 1 can detect the load applied to the manual hoist 6.

2 and 3, the set load excess detection device 1 is shown.
Is shown. With reference to FIGS. 2 and 3, the set load excess detection device 1 includes a tubular casing 10 and a core 11.
The tubular casing 10 includes a hollow cylindrical intermediate portion 10a, a small diameter end portion 10b integrally formed at one end portion of the hollow cylindrical intermediate portion 10a, and a disk shape screwed to the other end portion of the hollow cylindrical intermediate portion 10a. It is composed of a cover 10c. An arm 12 is integrally formed on the outer surface of the disc-shaped cover 10c, and the arm 12 is connected to the manual hoist body 6b via a pivot pin 13.

On the other hand, the core 11 is supported slidably in the axial direction of the cylindrical casing 10 in a cylindrical hole 14 bored in the small diameter end 10b. The core 11 projects outward from the end surface of the small-diameter end 10b, and the projecting tip of the core 11 is connected to the chain 2 via the pin 15. On the other hand, an enlarged portion 16 is integrally formed on the inner end portion of the core 11, and the spring retainer 17 having a split annular shape is held by the enlarged portion 16. A spring member 18, which is a laminated body of a large number of disc springs, is inserted between the spring retainer 17 and the inner end surface of the small-diameter end portion 10b. When no external force is applied to the set load excess detection device 1, the spring retainer 17 is connected to the spring member 10 as shown in FIG.
It is seated on the inner side surface of the disk-shaped cover 10c by the spring force.

An external thread 1 is formed on the outer peripheral surface of the small diameter end 10b.
9 is screwed, and an inner thread 21 of a cup-shaped adjusting member 20 is screwed to the small-diameter end 10b. The adjusting member 20 includes an annular portion 20a and an end surface portion 20b,
The inner thread 21 is formed on the inner peripheral surface of the annular portion 20a. A cylindrical hole 22 having a diameter slightly larger than that of the core 11 is formed in the center of the end surface portion 20b, and the core 11 extends through the cylindrical hole 22. An annular corrugated spring member 23 is inserted between the inner end surface of the annular portion 20a and the end surface of the hollow cylindrical intermediate portion 10a. When the adjusting member 20 is rotated around the axis of the tubular casing 10, the adjusting member 20 moves in the axial direction of the tubular casing 10, and when the rotation of the adjusting member 20 is stopped, the adjusting member 20 is stopped by the spring force of the spring member 23. It will be held in its original position.

As shown in FIG. 3, a groove 24 of uniform width is formed on the outer peripheral surface of the core 11 slightly inward of the end surface portion 20b of the adjusting member 20 and extending over the entire circumference. ,
For example, red paint is applied to the entire bottom surface of the groove 24. The portion to which the red paint is applied forms a set load excess mark 25, which will be simply referred to as mark 2 below.
It is called 5. As described above, FIG. 3 shows the case where the external force is not applied to the set load excess detection device 1, and at this time, the mark 25 is hidden inside the end surface portion 20b of the adjustment member 20 as shown in FIG. . On the other hand, when an outward load is applied to the protruding tips of the arm 12 and the core 11 of the disk-shaped cover 10c, that is, the set load excess detection device 1
When an external force acts on the core 11, the core 11 moves in the direction of protruding from the cylindrical casing 10 against the spring force of the spring member 18,
The movement amount of the core 11 at this time is determined by the set load excess detection device 1
Proportional to the external force acting on.

At this time, when the external force acting on the set load excess detecting device 1 increases, the mark 25 is exposed to the outside from the end face portion 20b of the adjusting member 20. The magnitude of the external force at this time changes depending on the position of the adjusting member 20, and therefore the adjusting member 2
By changing the position of 0, the external force when the mark 25 is exposed to the outside, that is, the set load can be changed. The relationship between the set load and the position of the adjusting member 20 is displayed on the outer peripheral surface of the tubular casing 10 as shown in FIG. That is, when the triangular mark displayed on the outer peripheral surface of the adjusting member 20 is aligned with the selected triangular mark of the triangular marks displayed on the outer peripheral surface of the tubular casing 10, the external force is changed to the selected triangular mark. The mark 25 is exposed to the outside when the applied load (1000 kg in the case shown in FIG. 2) is reached. This mark 25
Has a prominent color, for example, red, so that the operator can easily recognize that the external force exceeds the set load.

As described above, according to the present invention, it is possible to easily recognize that the external force has reached the set load, and the set load can be arbitrarily changed. In the embodiment shown in FIGS. 2 and 3, once the triangular mark of the adjusting member 20 is aligned with the triangular mark to be selected on the tubular casing 10, the adjusting member 20 is held at that position by the spring force of the spring member 23. However, if there is a risk that the adjusting member 20 will rotate, for example, a large number of ball receiving holes are formed on the end surface of the tubular casing 10, and the balls and the ball receiving holes fitted in the ball receiving holes are formed. A spring member for pressing the ball toward may be provided in the adjusting member 20.

FIG. 4 shows another embodiment of the set load excess detection device. In this embodiment, the same components as those in FIGS. 2 and 3 are designated by the same reference numerals. Referring to FIG. 4, in this embodiment, a cylindrical hole 26 is formed in the end portion 10b of the cylindrical casing 10, and a hollow cylindrical adjusting member 27 is slidably inserted into the cylindrical hole 26. As shown in FIG. 4, a part of the adjusting member 27 projects from the cylindrical housing 10 to the outside. The core 11 facing the adjusting member 27
An outer screw thread 28 is screwed on the outer peripheral surface of the, and an inner screw thread 29 screwed on the inner peripheral surface of the adjusting member 27 is screwed onto the outer screw thread 28. Therefore, when the adjusting member 27 is rotated around the axis of the core 11, the adjusting member 27 moves in the axial direction of the core 11.

As shown in FIG. 4, the casing end 10
A groove 30 of uniform width is formed on the outer peripheral surface of the adjusting member 27 slightly inward of the outer end surface of b, and extends over the entire circumference. Paint is applied. The portion to which the red paint is applied forms the set load excess mark 31. FIG. 4 shows a case where no external force is applied to the set load excess detection device 1 ', and at this time, the mark 31 is hidden inside the casing end portion 10b as shown in FIG. On the other hand, when an external force acts on the set load excess detection device 1 ', the mark 31 is exposed to the outside from the outer end surface of the casing end portion 10b. The magnitude of the external force at this time changes depending on the position of the adjusting member 27,
Therefore, by changing the position of the adjusting member 27, the external force when the mark 31 is exposed to the outside, that is, the set load can be changed. The relationship between the set load and the position of the adjusting member 27 is displayed on the outer peripheral surface of the core 11 as shown in FIG. That is, the adjusting member 27
When the triangular mark displayed on the outer peripheral surface of the core 11 is aligned with the selected triangular mark among the triangular marks displayed on the outer peripheral surface of the core 11, the external force is applied to the selected triangular mark (see FIG. 4). In the case of (1), the mark 31 is exposed to the outside when reaching 1000 kg). The mark 31 has a prominent color, for example, red, so that the operator can easily recognize that the external force exceeds the set load in this embodiment as well.

[0017]

As described above, it is possible to easily recognize that the load has reached the set load, and the set load can be arbitrarily changed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of how to use a set load excess detection device according to the present invention.

FIG. 2 is a side view of a set load excess detection device.

FIG. 3 is a side sectional view of a set load excess detection device.

FIG. 4 is a side sectional view showing another embodiment of the set load excess detection device.

[Explanation of symbols]

 10 ... Cylindrical casing 11 ... Core 18 ... Spring member 20, 27 ... Adjusting member 25, 31 ... Mark

Claims (2)

(57) [Claims] 1. A tubular casing, a set load selecting adjusting member attached to one end of the casing so as to be movable in the axial direction of the casing, and sliding in the casing in the axial direction of the casing. A core that is movably inserted and that penetrates through the adjusting member and projects outward from the adjusting member, increasing the outward load that acts on the other end of the casing and the projecting tip of the core. A spring member is inserted between the casing and the core so that the protrusion amount of the core increases as a result, and when the outward load does not act, the spring member is located inside the casing and the outward load depends on the movement amount of the adjusting member. A set load excess detection device in which a set load excess mark, which is exposed from the adjusting member to the outside when the set load determined by the above is exceeded, is formed on the outer peripheral surface of the core. 2. A tubular casing, a core movably inserted in the casing in the axial direction of the casing and protruding from one end of the casing to the outside, and movable in the axial direction of the core. An outward load acting on the other end of the casing and the projecting tip of the core, the adjusting load selecting member being mounted on the core and partially protruding from one end of the casing; A spring member is inserted between the casing and the core so that the amount of protrusion of the core increases as the load increases. A set load excess detection device having a set load excess mark, which is exposed from one end of the casing to the outside when a set load determined according to the amount is exceeded, is formed on the outer peripheral surface of the adjustment member.