JP2011256042A - Manual auxiliary chain block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary chain block used by rotating by holding a hand wheel with one hand by being suspended by an overhead travelling crane, a crane and a suspending hook of a chain block, capable of slowly lowering a heavy load such as a metal mold little by little, and unprovided with a hand chain.SOLUTION: This manual auxiliary chain block includes a frame body 2 having side plate parts 2L and 2R opposed in the lateral direction, an upper hook 6 hooked on a lower hook of the overhead travelling crane or the like, a driving shaft 3 rotatably supported by a shaft in the frame body 2, a load sheave, a load chain 25 for installing the lower hook 26, a deceleration mechanism, and a one-way clutch mechanism. A hand wheel 40 for rotatably operating by gripping with one hand, is installed in one end part 3a becoming the power input side of the driving shaft 3, and the load chain 25 is used in a short size in the length.

Description

  The present invention is used by hanging on a lower hook suspended from a lifting device such as an overhead traveling crane, crane, chain block, etc. The present invention relates to a manual auxiliary chain block in which a hand chain is not provided.

In a machining factory, a machine assembly factory, a mold finishing factory, and the like that handle iron and the like, overhead traveling cranes that transport and lift heavy metal materials and parts are installed.
The overhead traveling crane is equipped with a suspension chain or cable that moves up and down by a motor drive, and a lower hook is attached to the lower end of the suspension chain or cable. A heavy object is suspended from the lower hook using a wire or the like.

Moreover, there is a chain block as an apparatus for lifting and lowering a heavy object, which includes an electric chain block and a manual chain block described in Patent Document 1, for example.
The electric chain block is driven by a push button provided on a small pendant (controller) suspended below to raise and lower the lower hook. In a manual chain block, the user holds the hand chain with both hands and pulls it up and down to rotate the handwheel to raise and lower the lower hook.

JP 2000-153993 A

  However, when using a wire or the like on the lower hook of an overhead traveling crane to lift and lower a heavy metal material, the time for starting the switch operation with the fingertip of the push button provided on the pendant and the fingertip move. There is a momentary time difference from the time when the switch is actually turned on, and the push button has some play in the operation direction due to its structure. For this reason, for example, a heavy metal mold needs to be lowered by 1 cm, but it is lowered more rapidly than this, and a shock is applied to the table or lower mold, resulting in a precisely finished mold part. There was a defect that caused scratches.

  In order to solve this problem, recently, electric lifting type overhead traveling cranes equipped with a slow push button that can perform the lifting operation of the lower hook finely have spread, and the latest model has a super slow push button mechanism that exceeds that Has also been developed. However, since these models are expensive, it is difficult to replace them by many small and medium-sized companies using conventional overhead traveling cranes. For this reason, conventionally, the lifting operation is performed by simulating the super-throwing up and down exceeding the slow by repeating the operation of pressing the operation button in small increments while paying close attention.

In the case of an electric chain block, there is a problem similar to the overhead traveling crane described above, and it is no longer common to work by repeatedly pressing the operation button in small increments, but in rare cases, the operation button is It was broken and a serious injury occurred due to runaway climbing. Regular replacement of pendants with control buttons is generally not performed, so field workers have always had a risk of runaway accidents and a side-by-side risk.
Also, when a metal material such as a mold with a mirror-finished bottom surface is placed on the machine tool, both sides come into close contact with each other, so if you try to lift it with an electric chain block that cannot adjust the torque, Stressed upward force was applied, which contributed to the failure of machine tools.

  A conventional manual chain block without a push button has a structure in which a hand chain is grasped with both hands and operated up and down. Since this operation is mainly an arm operation, it is easy to make a rough operation, and the weight of the hand chain itself hinders a fine operation. In addition, the long hand chain flexing and shaking makes it difficult to perform detailed operations such as slightly raising and lowering the lower hook. Furthermore, since the hardened and hardened hand chain may sway and come into contact with the finished mold or the like, the conventional manual chain block has not been used in actual work.

  The present invention has been proposed in view of such circumstances, and is used by hanging on a lower hook suspended from a lifting device such as an overhead traveling crane, crane, chain block, etc. It is an object of the present invention to provide a manual auxiliary chain block which is operated and can be lifted and lowered slowly and slowly in small increments and is not provided with a hand chain.

The manual auxiliary chain block of the invention according to claim 1 is a frame having side plate portions opposed in the lateral direction, an upper hook mounted upward from the upper part of the frame, the drive shaft, A load sheep that is fitted and supported in an interlocking manner with the drive shaft on the inner side of the frame body and is smoothly supported on both sides of the frame body, and an end portion of the drive shaft that protrudes outward from one side of the frame body A hand wheel that is supported so as to rotate freely, a power transmission mechanism that decelerates the rotational power applied to the drive shaft and transmits it to the load sheep, and a front end portion that is hung while engaged with the load sheep. A load chain suspended from the load chain, a lower hook attached to one end of the load chain, and the rotation of the handwheel is transmitted to the drive shaft and a gravitational object is placed on the lower hook. And a mechanical brake mechanism for preventing reverse rotation of the drive shaft due to the weight load when it is lowered as a basic structure,
The handwheel is a handwheel that can be directly gripped by a hand and rotated.
As the load chain, a short chain is used in which the lower hook is lifted and lowered in an auxiliary short range.

When the structural difference between the manual auxiliary chain block according to the present invention and the conventional manual chain block is described, the features of the manual auxiliary chain block according to the present invention will become clearer.
A conventional manual chain block has a handwheel attached to one end on the power input side of the drive shaft in a freely interlocking manner, and this handwheel is hung with a hand chain that is pulled by hand engaged. Yes. And in many models, the side of the handwheel is covered with a cover.
On the other hand, the manual auxiliary chain block according to the present invention is attached to one end of the drive shaft on the power input side so that it can be interlocked with a handwheel that is directly gripped with one hand and is not covered with a cover. The hand chain is not provided.
Examples of the hand wheel include a substantially disk shape having an outer peripheral wall having a height in the front-rear direction and a shape having a ring-shaped clamping portion. Since the wheel of an automobile or a single vehicle is also called a wheel, this handwheel is not limited to a disk shape.
In contrast, the conventional manual chain block uses a long load chain that is required to move up and down by about 3 m, whereas the manual auxiliary chain block according to the present invention lifts and lowers heavy objects at a short distance (for example, several tens of centimeters). A short load chain used for fine adjustment is used.

There are also significant differences in usage.
Although the conventional manual chain block is used alone, the manual auxiliary chain block according to the present invention is used together with a lifting device such as an overhead traveling crane, a crane, or a chain block. That is, the manual auxiliary chain block according to the present invention is hung on a lower hook of a lifting device such as an overhead traveling crane, a crane, or a chain block. A heavy object is hung on the lower hook of the manual auxiliary chain block according to the present invention.
When the manual auxiliary chain block of the present invention is used, the long-distance raising / lowering is performed by a lifting device such as an overhead traveling crane, a crane, or a chain block. Then, the fine adjustment of the short distance thereafter is performed by the manual auxiliary chain block according to the present invention. As described above, the manual auxiliary chain block according to the present invention uses a short load chain instead of a conventional long load chain in order to perform fine adjustment of raising and lowering a short distance.

There are also significant differences in the operation method of rotating the handwheel.
In the conventional manual chain block, the hand chain is gripped with both hands and moved up and down to rotate the hand wheel. However, in the manual auxiliary chain block according to the present invention, the hand wheel is directly gripped and rotated.
When pulling the hand chain, it is difficult to rotate the hand wheel in small increments.If the hand chain is slightly shaken in the lateral direction, this small rotation operation becomes even more difficult. If you grab and operate with, you can also rotate the handwheel in small increments using the movement of your fingers.

  In the manual auxiliary chain block according to the second aspect of the present invention, the handwheel is further provided with a knob for picking it up with a fingertip and rotating the handwheel. For this reason, the hand wheel may be grasped by a hand and rotated, or the hand wheel may be rotated by picking this knob with a fingertip.

  A manual auxiliary chain block according to a third aspect of the present invention is the visual auxiliary chain block according to any one of the above configurations, wherein when the lower hook is lowered to a position near the lower end at a position halfway along the load chain. Colored display that can be confirmed. Examples of the color display include a red paint. The colored display may be, for example, a two-stage display with red and yellow intervals. In this case, when the tip of the load chain is lowered, the yellow display is confirmed first, and then the red display is confirmed.

According to the manual auxiliary chain block according to claim 1, as a result of having a configuration in which a handwheel that is gripped and rotated by hand is attached to one end on the power input side of the drive shaft, the handwheel is chopped in small increments. Rotate and lift heavy objects in small increments. In addition, since the intuitive movement of the hand can be transmitted directly to the heavy object, it is possible to move up and down finely.
For this reason, it can be safely and slowly lowered without damaging heavy objects such as molds. Moreover, this operation is easy. In addition, since the hand chain used in the conventional chain block is not necessary, it is possible to work easily without worrying about the hand chain, and there is no problem due to the hand chain coming into contact with a heavy object such as a mold. .

  According to the manual auxiliary chain block according to claim 2, as a result of having a structure in which the handwheel may be gripped by hand and rotated, or the handwheel may be rotated by gripping this knob with a fingertip. Easy to use with a fingertip at the fingertip, and can be used in combination with a finer lifting operation.

  According to the manual auxiliary chain block according to claim 3, when the lower hook is lowered to a position near the lower end at a position halfway along the load chain, a colored display is provided for visually confirming the lower hook. Therefore, when this colored display becomes visible, it is convenient to determine how much the load chain can be lowered further. Further, it is possible to properly determine the distribution of lifting by the lifting device such as an overhead traveling crane, a crane, a chain block, and the manual auxiliary chain block.

1 is a perspective view of a manual auxiliary chain block according to an embodiment of the present invention. The perspective view which decomposed | disassembled and showed the part similarly. Similarly side sectional drawing. The perspective view which showed the front-end | tip part of the drive shaft with the peripheral part. The figure which showed the reverse rotation prevention mechanism by a claw gear and a claw member. (A) is the perspective view which looked at the handwheel from the front side, (b) is the perspective view which looked from the back side similarly. (A) is the fragmentary perspective view which showed the manual type auxiliary chain block which provided the handwheel by another shape, (b) is side sectional drawing of this handwheel. The fragmentary perspective view of the manual type auxiliary chain block provided with the load chain by which the color indication was carried out in the location of the middle length.

  Modes for carrying out the present invention will be described in detail in the following examples.

  A manual auxiliary chain block (hereinafter, abbreviated as a manual auxiliary chain block of the present invention) 1 according to an embodiment of the present invention shown in FIG. 1 is directed upward from the upper inner side of the frame body 2 in appearance. The upper hook 6 attached to the frame 2, the load chain 25 suspended downward from the inside of the frame 2, the lower hook 26 attached to the tip 25 a of the load chain 25, and a hand located on one side of the frame 2 A wheel 40 and a gear case 29 mounted on the other side of the frame body 2 are provided, and the frame body 2 has a structure in which two side plates 2L and 2R are assembled to face each other.

The upper hook 6 is a portion that is hung on a lower hook that is suspended from a lifting device such as an overhead traveling crane, a crane, or a chain block, and a heavy object is hung on the lower hook 26.
The manual auxiliary chain block 1 of the present invention is used together with the lifting device. In this sense, auxiliary words are used.
The operation of raising and lowering the heavy object is performed by the lifting device, and the operation of slowly lowering the heavy object by small increments is performed by the manual auxiliary chain block 1 of the present invention. When the handwheel 40 is grasped with one hand or both hands and is gradually rotated in one direction, the lower hook 26 is lowered, and when the handwheel 40 is rotated in the opposite direction, the lower hook 26 is raised.

As shown in FIGS. 2 and 3, the load sheep 12 is rotatably fitted and supported at the center of the drive shaft 3 located inside the frame 2. The load sheep 12 is supported on both sides of the frame body 2 so as to be smoothly rotatable, and one end portion 12a on the input side protrudes outward of the frame body 2. A small-diameter tooth 3c is provided in the middle of the one end 3b on the power output side of the drive shaft 3.
A spur gear 10 is attached to one end portion 12a of the load sheep 12 in a state where the spur gear 10 is rotated.
On both sides of the spur gear 10, two-stage gears 8 and 9, in which large and small gear portions are integrally formed with the shaft portion, are loosely supported, and the small-diameter teeth 8 a and 9 a of the two-stage gears 8 and 9 are flat. The gears 10 are meshed with each other. Since FIG. 3 is a sectional view, only one two-stage gear 9 is shown.

  A small-diameter tooth 3c is engraved on the rear end portion of the drive shaft 3 protruding from one end side of the load sheep 12, and the large-diameter teeth 8b and 9b of the two-stage gears 8 and 9 are respectively provided on the tooth 3c. Meshed. For this reason, when the drive shaft 3 is rotated, this rotation is decelerated in the process of being transmitted from the teeth 3c to the gear 10 through the two-stage gears 8 and 9, and the load sheep 12 is rotated at a reduced speed. Thus, the speed reduction mechanism 11 is constituted by the combination of the teeth 3c, the two-stage gears 8 and 9, and the gear 10.

A load chain 25 is hung on the load sheep 12 in an engaged state inside the frame body 2. A rear end portion of the load chain 25 is connected to the frame body 2, and a portion 25 b in the middle of the length of the load chain 25 hangs downward from the inside of the frame body 2.
For this reason, when the load sheep 12 rotates in a direction in which the front end portion 25a of the load chain 25 to which the lower hook 26 is attached is lowered, the halfway portion 25b of the load chain 25 is pulled up. When the load sheep 12 rotates in a direction in which the tip end portion 25a of the load chain 25 to which the lower hook 26 is attached is raised, the length intermediate portion 25b of the load chain 25 further hangs down. In the manual auxiliary chain block 1 of the present invention, it is sufficient that the lower hook 26 has an ascending / descending distance of several tens of cm to 50 cm. Therefore, a short load chain 25 is used.

As shown in FIGS. 2, 3A and 4A, the manual auxiliary chain block 1 of the present invention is equipped with a mechanical brake mechanism.
The mechanical brake mechanism is provided on one side (left side in the figure) of the frame body 2, transmits the rotation by the handwheel 40 to the drive shaft 3, and is driven by a heavy load when a gravitational object is suspended from the lower hook 26. The reverse rotation of the shaft 3 is prevented.

Each part which comprises a mechanical brake mechanism is explained in full detail.
As shown in FIG. 4 with reference to FIGS. 2 and 3, the one end portion 3 a on the power input side of the drive shaft 3 is slightly smaller in diameter than the central portion. The base portion side of the one end portion is a spline shaft portion 3d in which longitudinal grooves are engraved at equal intervals, and a screw groove is formed on the outer peripheral surface at the tip end side of the base portion side 3d of the one end portion 3a. The screw shaft portion 3e is engraved. And the pin hole 3f is opened in the further front end side of the one end part 1a.
As shown in FIGS. 2 and 3, a disk hub 31 is spline-fitted to the base side 3d of the one end portion 3a of the drive shaft 3 so as to be slidable in the axial direction, and is supported so as to be capable of interlocking rotation.
A pawl gear 17 is loosely supported by the disk hub 31, and donut-shaped friction plates 32 and 32 are fixed to the left and right sides of the pawl gear 17.
A donut-shaped braking plate 33, a hand wheel 40, and a collar 42 are supported in this order on the screw shaft portion 3e protruding from the front end side of the disk hub 31, and these members 33, 40 are supported in the pin hole 3f. , 42 is inserted and locked. For this reason, when the handwheel 40 moves slightly forward in the axial direction and presses the brake plate 33, the left and right friction plates 32 are pressed by the brake plate 33 and the large-diameter flange portion 31 a of the disc hub 31, and the claw gear 17. It is structured to give a brake to rotation.

In the center of the handwheel 40 shown in FIGS. 2 and 3, there is formed a hole 40a in which an inner screw groove that is screwed into the screw shaft portion 3e is formed on the inner sliding surface. For this reason, when the handwheel 40 screwed to the screw shaft portion 3e is rotated, the handwheel 40 moves forward in the axial direction for pressing the friction plate 32. When the handwheel 40 is rotated counterclockwise, the handwheel 40 is slightly retracted in the axial direction.
The handwheel 40 remains screwed to the screw shaft portion 3e in both the advancement and retraction, and thus the drive shaft 3 rotates in each direction.

As shown in FIGS. 2, 3, and 5, a claw member 16 is rotatably attached to a pin 14 that is supported and fixed to the frame 2 and protrudes to one side, and the claw member 16 has a tip portion thereof. The claw gear 17 is biased by a spring 15 in a direction to enter the claw portion 17a.
The mechanical brake mechanism is configured by combining the above components.

For this reason, even if a heavy load is applied to the lower hook 26, the reverse rotation of the drive shaft 3 due to the weight load being applied by the meshing of the claw gear 17 and the claw member 16 is prevented, and the gravity object is suspended. The lower hook 26 does not descend carelessly.
When raising the lower hook 26, the handwheel 40 is rotated to the right. If it does in this way, the handwheel 40 will advance a little in the direction which presses the friction board 33 to an axial direction, and will pinch the claw gear wheel 17. Therefore, the pawl gear 17 rotates clockwise while the brake is applied, rotates the drive shaft 3 screwed to the right, and rotates the load chain 25 in the winding direction. When the claw gear 17 rotates to the right, the tip of the claw member 16 rushing into and engaging with the claw gear 17 is raised at the inclined edge of the claw portion 17a of the claw gear 17, and in turn to the adjacent claw 17a. Perform rushing action. For this reason, even if a load due to gravity is applied to the drive shaft 3, it does not rotate counterclockwise and the lower hook 26 is prevented from descending.
When lowering the lower hook 26, the handwheel 40 is rotated counterclockwise. In this way, the drive shaft 3 is rotated counterclockwise at a position where the handwheel 40 is slightly retracted in the axial direction. At this time, the claw gear 17 does not rotate because the pressure applied by the friction plate 33 is not acting, and therefore the handwheel 40 can be rotated with a relatively light force.

  The above configuration is completely the same as the structure in which the hand chain and the hand wheel of the conventional chain block are removed. That is, the manual auxiliary chain block 1 of the present invention is a hand that is rotated by grasping with one hand at one end 3a on the power input side of the drive shaft 3 by removing the hand chain and hand wheel of the conventional chain block. If the wheel 40 is mounted in the same manner as a conventional handwheel, it is completed. That is, in the manual auxiliary chain block 1 of the present invention, the components other than the hand chain and hand wheel of various conventional manual chain blocks can be used as they are.

A hand wheel 40 constituting the most characteristic part of the present invention is shown in FIGS. 5 (a) and 5 (b).
The hand wheel 40 has a substantially circular shape in front view so that it can be grasped with one hand and a finger of the hand can be attached to the outer peripheral wall surface 41c. The outer peripheral wall surface 41c has corrugated irregularities so that it can be easily rotated. Is formed. The surface 41b of the hand wheel 40 is a low step portion with a gently curved surface, and one end portion which becomes a power input portion of the drive shaft 3 shown in FIGS. A hole 40a for entering 3a is formed.
As described above, the inner wall of the hole 40a is provided with an internal thread groove that is screwed into the threaded shaft portion 3e of the one end 3a serving as the power input section of the drive shaft 3 shown in FIG.

  As shown in FIG. 3 and FIG. 6A, on the surface 21 b of the handwheel 40, a knob 41 that rotates with the fingertip to rotate the handwheel 40 is provided together with the support pins 42. The knob 41 is provided on the lower surface of the handwheel 40 and does not interfere with the handwheel 40 being gripped by hand. In this way, the handwheel 40 may be rotated by grasping with a hand, or the handwheel 40 may be rotated by grasping the knob 41 with a fingertip.

As shown in FIG. 6B, on the back side surface of the handwheel 40, double circular ribs 40e and a plurality of reinforcing ribs 41d extending radially are formed. Thus, if the outer peripheral wall surface 41c, the double circular rib 40e, and the multiple reinforcing ribs 41d are provided, the outer shape is thick in the front-rear direction, and the resin can be molded into an easy-to-use and durable shape.
The hand wheel 40 having the above-described shape is an example that is suitable, and the hand wheel 40 used in the manual auxiliary chain block 1 of the present invention is not limited to the above-described shape. Anything that can be grabbed by hand and rotated is sufficient.

  The handwheel 40A shown in FIGS. 7A and 7B is a thick short cylinder in which an inner screw groove that is screw-engaged with one end 3a that becomes a power input portion of the drive shaft 3 is engraved on the inner wall of the hole 40a. A ring-shaped handle 45 that is gripped with both hands and rotated around the shape-equipped mounting portion 43 is supported by the leg members 44, 44,... The knob 41 is provided with a knob 41 that is rotated.

  In the load chain 25 shown in FIG. 8, a colored display 25c with a red paint is provided at a part of the length of the road chain 25. When the lower hook 26 is lowered to a position near the lower end, the colored display 25c is displayed on the frame 2. Appears below. When this colored display 25c is seen, it is possible to know how much room the load chain can be lowered further.

  The manual auxiliary chain block of the present invention can be used in various fields that use lifting devices such as overhead traveling cranes, cranes, and chain blocks. In particular, it is expected to be usable in the machine tool assembly field, machine tool user, mold manufacturing field, resin and metal product manufacturing field using molds, where heavy objects need to be lifted slowly and slowly in small increments. Is done.

1 Manual auxiliary chain block (according to one embodiment of the present invention) 2 Frame 2L, 2R Side plate 3 Drive shaft 6 Upper hook 8, 10 Two-stage gear 9 Gear 11 Reduction mechanism 12 Load sheep 15 Spring 16 Claw member 17 Claw gear 25 Load chain 25c Colored display 26 Lower hook 29 Gear case 40 Hand wheel 41 Knob

1 is a perspective view of a manual auxiliary chain block according to an embodiment of the present invention. The perspective view which decomposed | disassembled and showed the part similarly. Similarly side sectional drawing. The perspective view which showed the front-end | tip part of the drive shaft with the peripheral part. The figure which showed the reverse rotation prevention mechanism by a claw gear and a claw member. (A) is the perspective view which looked at the handwheel from the front side, (b) is the perspective view which looked from the back side similarly. (A) is the fragmentary perspective view which showed the manual type auxiliary chain block which provided the handwheel by another shape, (b) is side sectional drawing of this handwheel. The fragmentary perspective view of the manual type auxiliary chain block provided with the load chain by which the color indication was carried out in the location of the middle length.

Claims (3)

A frame having side plate portions opposed to each other in the lateral direction, an upper hook mounted upward from the upper part of the frame, a drive shaft, and an insertion support that can be interlocked with the drive shaft inside the frame. A load sheave supported on both sides of the frame body so as to be smoothly rotatable, a hand wheel supported rotatably on one end of a drive shaft that protrudes outward from one side of the frame body, and the drive shaft A power transmission mechanism that decelerates and transmits the rotational power applied to the load sheep, a load chain that is engaged with the load sheep and that hangs downward at the tip, and one end of the load chain Rotation of the drive shaft due to a weight load when a gravity object is suspended from the lower hook while transmitting the rotation of the handwheel to the drive shaft and the lower hook attached to the part And a mechanical brake mechanism for preventing the basic structure,
The handwheel is a handwheel that can be directly gripped by a hand and rotated.
The load chain is a manual auxiliary chain block having a short length that suppresses the lower hook from moving up and down within a short auxiliary range.   The manual auxiliary chain block according to claim 1, wherein the handwheel is provided with a knob for rotating the handwheel by pinching with a fingertip.   3. The manual assist according to claim 1, wherein a colored indication is provided at a mid-length portion of the load chain so that the lower hook can be visually confirmed when it is lowered to a position near the lower end. Chain block.

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