Hand chain drive device

Abstract

To improve the situation where a worker uses a chain block and manually drives a hand chain to lift a heavy object, which requires considerable labor and time.SOLUTION: A hand chain drive device according to an embodiment drives a hand chain of a chain block, and includes two drive gears that drive the hand chain, a rotating gear arranged with a predetermined gap between the two drive gears, a tension adjustment unit that holds the rotation shaft of the rotating gear and can adjust the tension of the hand chain hung between the two drive gears, and protrusions provided on the drive gears and the rotating gear to mesh with the hand chain.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE The present invention relates to a hand chain drive. [Background technology]

[0002] In factories, construction sites, and the like, chain blocks have traditionally been used to hoist and move heavy objects that are too heavy for humans to carry by hand, or objects that are too shaped to be carried by hand.

[0003] A chain block is a piece of equipment that uses the principles of a pulley and a lever to lift and transport heavy objects. The way a chain block works is that an operator manually operates a hand chain to rotate the pulley, which winds up the cargo chain and lifts the cargo attached to the end of the chain. Due to the structure of the chain block, the heavier the cargo, the smaller the amount of cargo that can be lifted with one rotation of the pulley, and it takes a considerable amount of effort and time to lift a heavy object to a specified position.

[0004] According to the chain block hand chain drive device of Patent Document 1, a chain block hand chain drive device is attached to a hand chain, and the hand chain is driven by the chain block hand chain drive device to hoist the cargo chain, thereby reducing the labor required by the worker. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 07-215682 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, when a worker uses a chain block to manually operate a hand chain to lift a heavy object, it requires considerable effort and time.

[0007] In addition, the chain block hand chain drive device described in Patent Document 1 is attached to a hand chain, so the device is suspended in mid-air, and when actually used, a worker must work while holding the device in mid-air to prevent it from moving, which requires manual labor. Furthermore, the hand chain and wheel are held in engagement only by the friction between them, so there is a risk that the hand chain will come off the chain block hand chain drive device, posing problems in terms of workability and safety. [Means for solving the problem]

[0008] In order to solve the above problems, the hand chain drive device of the embodiment is a hand chain drive device for driving a hand chain of a chain block, and includes two drive gears that drive the hand chain, a rotating gear arranged with a predetermined gap between the two drive gears, a tension adjustment unit that holds the rotation axis of the rotating gears and can adjust the tension of the hand chain hung between the two drive gears, and protrusions provided on the drive gears and the rotating gears to mesh with the hand chain. [Brief description of the drawings]

[0009] [Figure 1] Schematic diagram of a hand chain drive device according to an embodiment attached to a chain block. [Diagram 2] 1 is a top view of a hand chain drive device according to an embodiment; [Diagram 3] Cross-sectional view of the AA' section in FIG. [Figure 4] Cross-sectional view of the BB' section in FIG. [Diagram 5] FIG. 1 is a side view and a cross-sectional view taken along CC′ of a rotary gear 15 according to an embodiment of the present invention. [Figure 6] FIG. 1 is a side view and a DD′ cross-sectional view of driving gears 16 and 17 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

[0011] The hand chain drive device according to the embodiment is explained with reference to FIG. 1, which shows a schematic diagram of the hand chain drive device according to the embodiment when attached to a chain block, FIG. 2, which shows a top view of the hand chain drive device according to the embodiment, FIG. 3, which shows a cross-sectional view along AA' in FIG. 2, FIG. 4, which shows a cross-sectional view along BB' in FIG. 3, FIG. 5, which shows a side view and CC' cross-sectional view of the rotating gear 15 according to the embodiment, and FIG. 6, which shows a side view and DD' cross-sectional view of the drive gears 16, 17 according to the embodiment.

[0012] As shown in Fig. 1, the chain block 30 has a gear set 33 with built-in gears and wheels. The chain block 30 also has a hand chain 31 that is driven by an operator, and a cargo chain 32 that is wound up by the gear set 33 when the hand chain 31 is driven, and hoists a cargo 34. The hand chain drive device 10 is used while being fixed to the ground, with the hand chain 31 meshed with the internal gears.

[0013] As shown in Figures 2 and 3, the external appearance of the hand chain drive device 10 comprises a lower half 20 which forms the base, an upper half 11 which is an upper cover provided on the top of the lower half 20, a fastening portion 14 consisting of a bolt and a nut which engages the upper half 11 and lower half 20, a hand chain insertion opening 12 which is an opening when inserting the hand chain 31, and power input portions 19a, 19b which are connected to a drive device such as an electric screwdriver.

[0014] The lower half 20 is a base that is fixed to the ground, which is the installation surface, with bolts or the like. The upper half 11 is a so-called upper cover that constitutes the main body of the hand chain drive device 10. When attaching a hand chain 31 to the inside of the hand chain drive device 10, the upper half 11 is removed, the hand chain 31 is passed through the hand chain insertion opening 12 provided in the upper half 11, the hand chain 31 is then attached to the drive gears 16, 17, and the upper half 11 is fastened to the lower half 20 with fastening parts 14a to 14d consisting of bolts and nuts.

[0015] As shown in the top view of the hand chain drive device 10 in Figure 2, the hand chain insertion opening 12 is open enough to allow the hand chain 31 to access the inside of the hand chain drive device 10. The shape of the opening is not limited to that shown in Figure 2, but it is formed as a single continuous opening from the drive gear 16 side to the drive gear 17 side so that the hand chain 31 can be attached to the chain drive device while maintaining its loop shape without having to disassemble the chain block 30. Since the hand chain 31 may swing when driven and come into contact with the upper half 11, it is desirable that the portion of the hand chain insertion opening 12 near the hand chain 31 has a large gap between it and the hand chain 31.

[0016] The lower half portion 20 is a so-called base portion that constitutes the main body portion of the hand chain drive device 10. The upper half portion 11 is engaged with the lower half portion 11 at fastening portions 14a to 14d. In the embodiment, the fastening portions 14a to 14d are configured with bolts and nuts, but the fastening method is not limited to this as long as the upper half portion 11 and the lower half portion 20 can be engaged with each other.

[0017] Furthermore, the lower half 20 is provided with fixing parts 21a-21d, to which the hand chain drive device 10 can be fixed with anchors, bolts, etc. The hand chain drive device 10 is heavy, so it can basically be used without being fixed. However, if the load 34 is considerably heavy, the force driving the hand chain 31 will be very large, so it is desirable to fix the hand chain drive device 10. In the embodiment, there are four fixing parts 21a-21d, but the number should be changed depending on the weight of the load to be lifted, and is not limited to four.

[0018] Furthermore, power input units 19a and 19b are provided in the lower half 20. As shown in Fig. 4, the power input units 19a and 19b are connected to the power transmission gears 18a and 18b inside the hand chain drive device 10 via power transmission shafts 24, respectively. For example, by connecting a drive device such as an electric screwdriver to the power input unit 19a or 19b and rotating the power input unit 19a or 19b, the power transmission gears 18a and 18b inside the hand chain drive device 10 can be rotated. The drive device is not limited to an electric screwdriver, and may be any device that does not require labor by an operator, such as an electric motor or a hydraulic drive device.

[0019] Next, the internal configuration of hand chain drive device 10 will be described with reference to Figures 3 to 6. As shown in Figure 3, the inside of hand chain drive device 10 is composed of drive gears 16, 17 that can drive hand chain 31 by rotating while meshed with hand chain 31, tension adjustment unit 13 that presses hand chain 31 against drive gears 16, 17 so that hand chain 31 can be driven without coming off drive gears 16, 17, rotating gear 15 provided at the end of tension adjustment unit 13, and power transmission gears 18a, 18b that transmit power from power input units 19a, 19b to drive gears 16, 17, respectively.

[0020] Fig. 4 shows a cross-sectional view of the BB' cross section in Fig. 3. As shown in Fig. 4, the drive gear 16 is installed with a drive gear rotating shaft 23 suspended and held by two support columns 22a provided on the lower half 20 as its rotation axis. Similarly, the drive gear 17 is installed with a drive gear rotating shaft 23 suspended and held by two support columns 22b as its rotation axis (see Fig. 3). The rotating gear 15 is installed with a rotating gear rotating shaft 25 suspended and held by two tension adjustment parts 13 as its rotation axis (see Fig. 3).

[0021] First, the rotating gear 15 will be described with reference to Figures 3 and 5. As shown in Figure 5, the rotating gear 15 is composed of a main body 42 sandwiched between outer rings 41a and 41b, and the main body 42 is provided with a plurality of protrusions 43 for meshing with the hand chain 31. In the embodiment, 12 protrusions 43 are provided, but this is not limited to 12, and it is preferable to have a number that matches the intervals between each metal fitting (individual ring) that constitutes the hand chain 31. In addition, the protrusions 43 are provided at a height that does not protrude in the radial direction of the outer rings 41a and 41b, and the outer rings 41a and 41b act as a wall to prevent the hand chain 31 from coming off.

[0022] Furthermore, a hand chain slippage prevention part 44 is provided so as to elastically urge the protrusion 43 from inside the main body of the drive gears 16, 17 and the rotating gear 15. The hand chain slippage prevention part 44 is, for example, a compression spring. Here, the rotating gear 15 is disposed in the upper half part 11 via the tension adjustment part 13 as shown in FIG. 3, and elastically urges the rotating gear 15 downward. The rotating gear 15 and the drive gears 16, 17 are disposed with a predetermined gap. The predetermined gap is, for example, a gap equivalent to the thickness of the hand chain 31. If the predetermined gap is the same as the thickness of the hand chain 31, when the upper half part 11 is engaged with the lower half part 20, the tip of the protrusion 43 of the rotating gear 15 enters each ring of the hand chain 31, so that the hand chain 31 and the rotating gear 15 do not slip. For example, if the gap between the rotating gear 15 and the drive gears 16, 17 is too small for the tip of the protrusion 43 to enter each ring of the hand chain 31, the protrusion 43 will sink into the main body of the rotating gear 15 against the pressure of the compression spring of the hand chain slippage prevention part 44 based on the difference between the thickness of the hand chain 31 and the gaps between the drive gears 16, 17, and the rotating gear 15, and the rotating gear 15 will press the hand chain 31 against the drive gears 16, 17 with the elastic force of the hand chain slippage prevention part 44. The specified gap need only be equal to or less than the thickness of the hand chain 31, and the smaller the gap between the rotating gear 15 and the drive gears 16, 17, the greater the elastic force of the hand chain slippage prevention part 44, and the stronger the force with which the hand chain 31 can be pressed against the drive gears 16, 17.

[0023] In addition, tension adjustment part 13 is, for example, a compression spring, and when upper half part 11 is engaged with lower half part 20, hand chain 31 meshed with drive gears 16, 17 is pressed down from the upper half part 11 side by rotating gear 15, making it possible to adjust the tension of hand chain 31. The tension of hand chain 31 can also be further adjusted by using a compression spring with a different elastic modulus. If it is desired to increase the tension of hand chain 31, a compression spring with a large elastic modulus can be used. The same applies when a compression spring is not used, and adjustment is also possible by changing tension adjustment part 13 itself to a different member.

[0024] Next, the drive gears 16 and 17 will be described with reference to Figure 6. Since the drive gears 16 and 17 have the same structure, only the drive unit 16 will be described. Since the drive gears 16 and 17 are obtained by adding a gear 45a to the rotary gear 15, the same reference numerals will be used for the same structures as the rotary gear 15, and the description will be omitted. Since the DD' cross section in Figure 5 is the same as the CC' cross section in Figure 4, the description will be omitted.

[0025] The structure of the drive gear 16 differs from that of the rotating gear 15 in that it has gears 45. This is because each gear 45 of the drive gear 16 meshes with a power transmission gear 18a to transmit power. When the drive gear 16 rotates, the hand chain 31 meshed with the protrusion 43 is pulled, allowing the load 34 to be raised or lowered. The drive gear 16 can rotate in either direction, making it suitable for both lifting and suspending applications.

[0026] Also, like the rotating gear 15 described above, the protrusion 43 on the drive gear 16 also has a hand chain slippage prevention part 44. Therefore, the hand chain 31 is pressed against each other by the hand chain slippage prevention part 44 provided on the rotating gear 15 and the hand chain slippage prevention parts 44 provided on the drive gears 16 and 17, and firmly meshes with the protrusion 43, making it possible to operate it smoothly without slipping, regardless of whether the drive gears 16 or 17 are rotating.

[0027] The power transmission gears 18a, 18b mesh with gears 45 of the drive gears 16, 17 as shown in Fig. 3. The power transmission gears 18a, 18b are connected to power input parts 19a, 19b, respectively, via power transmission shafts 24. When an external power source such as an electric screwdriver or an electric motor is attached to the power input parts 19a, 19b and started to input a driving force, the power transmission gears 18a, 18b can be rotated, and thus the drive gears 16, 17 can be rotated.

[0028] As described above, according to the embodiment, it is possible to lift and lower a load in a shorter time than manual work without requiring human labor by the worker. In addition, since there is a small possibility that the hand chain of the chain block will come off the hand chain drive device, the worker can work safely with good workability.

[0029] Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and spirit of the invention, and are included in the invention and its equivalents described in the claims. [Explanation of symbols]

[0030] 10...hand chain drive device, 11...upper half, 12...hand chain insertion opening, 13...tension adjustment section, 14a, 14b...fastening section, 15...rotating gear, 16, 17...driving gear, 18a, 18b...power transmission gear, 19a, 19b...power input section, 20...lower half, 21a-21d...fixed section, 22a, 22b...support, 23...driving gear rotating shaft, 24...power transmission shaft, 25...rotating gear rotating shaft, 30...chain block, 31...hand chain, 32...cargo chain, 33...gear set, 34...cargo, 41a, 41b...outer wheel, 42...main body, 43...projection, 44...hand chain slip prevention section, 45...gear

Claims

1. A hand chain drive device for driving a hand chain of a chain block, Two drive gears for driving the hand chain; a rotating gear provided between the two drive gears with a predetermined gap therebetween; a tension adjusting unit that holds a rotation shaft of the rotating gear and is capable of adjusting the tension of the hand chain that is stretched across the two driving gears; A protrusion is provided on the driving gear and the rotating gear so as to mesh with the hand chain; A hand chain drive device equipped with

2. a hand chain slippage prevention part that is provided so as to elastically bias the protrusion from inside the main body of the drive gear and the rotating gear, and that causes the protrusion to sink into the main body of the drive gear and the rotating gear based on the difference between the thickness of the hand chain and the gap between the drive gear and the rotating gear; 2. The hand chain drive of claim 1 further comprising:

3. A fixing portion for fixing the hand chain drive device to an installation surface; The hand chain drive device according to claim 1 or 2, further comprising:

4. a power input unit connected to an external power source of the hand chain drive device; a power transmission gear connected to the power input portion via a power transmission shaft and configured to transmit the input power to the drive gear; The hand chain drive device according to claim 1 or 2, further comprising:

Images