JPS5919141Y2 - Ratchet device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a ratchet device, and its purpose is to configure the ratchet device so that the claws of the ratchet device and the windmill rotate without contacting each other when the windmill rotates in the forward direction.

Hereinafter, a ratchet device used in a hoisting device will be explained as an example.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2.

Figure 1 shows the cross section of the hoisting device, and Figure 2 shows the cross-section of the hoisting device.
The ratchet device is shown in a line cross section.

In the figure, 1 is a pawl provided rotatably with respect to a shaft 2, 3 is a windmill having saw-shaped teeth formed on its outer periphery and these teeth and the pawl 1 engage, and 4 is a windmill with which the pawl 1 is engaged. It is a tension spring biased to engage the wind turbine 3.

Note that this tension spring 4 may be omitted because it is engaged by the weight of the claw itself when the claw 1 is disposed above the wind turbine 3; Arrow B
This tension spring 4 is normally provided to prevent the pawl 1 from swinging during rotation in the direction .

The ratchet device constituted by the above members includes the wind turbine 3
When the windmill rotates in the forward direction, the windmill 3 rotates while pushing the claw 1 outward against the force of the spring 4, and when the windmill 3 stops or tries to rotate in the opposite direction, the claw 1 engages with the windmill 3. to prevent it from being rotated.

Next, an example of a winding device equipped with the ratchet device described above will be explained.

When the pinion shaft 5 connected to a rotational drive source such as an electric motor rotates in the winding direction, the gear 6 meshed with the pinion portion 5a rotates.

The gear 6 and a disk 9 fixed to the output shaft 7 by a key 8 etc. are each provided with a threaded portion at the engagement portion, and these are screwed together, and when the gear 6 rotates in the winding direction, an output is generated. Since the load of the hoisted object acts on the shaft 7, the gear 6 moves rightward in FIG.

Therefore, the gear 6 presses the lining 10, and due to this frictional force, the wind turbine 3 and the disk 9 rotate as one, and the output shaft 7 rotates in the winding direction.

When the pinion shaft 5 stops rotating after a predetermined winding, the pawl 1 of the ratchet device engages with the windmill 3 and the output shaft 7
prevents reverse rotation and supports the load.

Note that lubricating oil 11 is supplied inside the case to lubricate the inside of the device.

Then, when the rotational drive source rotates in the opposite direction and the pinion shaft 5 rotates in the opposite direction, the gear 6 moves the threaded portion with the disk 9 to the left in FIG.

For this reason, the pressing frictional force exerted by the gear 6 on the rook 3 and the disc 9 through the lining 10 is released, the rook 3 and the output shaft 7 can freely rotate, and the hoisted object is moved by the load onto the rook shaft. It is lowered in synchronization with the rotation of 5.

Note that when the load of the hoisted object is heavy and the output shaft 7 attempts to rotate faster than the rotation of the pinion shaft 5, the gear 6 moves to the right and presses the rook 3 and disc 9 to perform a braking action. .

Therefore, in this case, the hoisting device is hoisted down at a predetermined speed by balancing the force that increases the speed due to the load with the braking action.

By the way, since the conventional ratchet device is configured as described above, when the rook 3 rotates in the forward direction, the pawl 1 and the rook 3 are always in contact with each other, and especially when the rook 3 is rotating quickly, there is a large This has the disadvantage that noise is generated, and furthermore, the contact between the pawl 1 and the rook 3 causes a great deal of wear and tear, resulting in a shortened service life.

This idea was made to eliminate the drawbacks of the conventional ones as described above. By configuring the pawl to separate from the cart when rotating in the forward direction and prevent the pawl and rook from coming into contact with each other, it reduces noise and wear. The aim is to provide a ratchet device that does not require a ratchet device.

An embodiment of this invention will be described below with reference to FIGS. 3 to 5.

Figure 3 shows a cross section of a hoisting device equipped with a ratchet device according to this invention.
The figure is a cross section taken along the line C--C in FIG. 3, showing the state in which the rook is rotating in the forward direction (the hoisting device is rotating to hoist).

In the drawings, the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts, so the explanation will be omitted.

9a is a groove provided on the outer periphery of the disk 9; 12 is this groove 9;
The distal end portion wound around a with a predetermined spring pressure is a spring formed in an S-shape, and can slide within this groove 9a with slight frictional resistance.

Two pins la and lb are driven into the side surfaces of the claw 1, and the tip of the spring 12 is movably inserted between these pins la and lb.

Note that the spring 12 wound in the groove 9a of the disc 9
The spring pressure on the disk 9 is caused by the spring 12 hitting the pin 1.
It is adjusted so that the sliding friction force due to the spring pressure when it comes into contact with a and rotates in the forward direction is greater than the tension of the tension spring 4 with respect to the pawl 1.

In the ratchet device configured as above, the fifth
As shown in the figure, when the rook 3 rotates in the forward direction (the hoisting device rotates in the hoisting direction), the tip of the spring 12 wound around the disc 9 that rotates together with the rook 3 is attached to the claw 1. The pawl 1 comes into contact with the provided pin 1a, and the sliding friction force due to the spring pressure of the spring 12 overcomes the tension of the tension spring 4 provided on the pawl 1, thereby moving the pawl 1 in the direction away from the rook 3.

Therefore, the rook 3 can rotate in the forward direction without contacting the pawl 1.

At this time, since a portion of the disc 9 and the spring 12 are immersed in the lubricating oil 11, this sliding frictional resistance does not increase the driving load of the ratchet device.

Next, when the rotation of the rook 3 stops, the bias of the spring 12 due to the rotation of the disc 9 becomes smaller than the tension of the tension spring 4, so the pawl 1 is immediately pulled in the direction of the rook 3 and the pawl 1 The rook 3 is engaged with the rook 3, and reverse rotation of the rook 3 is prevented.

Note that even if the static friction force between the spring 12 and the disc 9 is greater than the tension of the tension spring 4, if the rook 3 rotates slightly in the opposite direction, the spring 12 will be released from the pin 1a. , the pawl 1 engages with the rook 3 when the rook 3 is rotated in the opposite direction by about one tooth, thereby preventing the rook from rotating in the opposite direction.

In addition, as shown in Figures 4 and 5, the flip-up is 1.
The tip of the rook 2 is formed in an S-shape, so if this tip is inserted between the pins 1a and 1b, the rook 3 will rotate in the forward direction (in the direction of arrow B in Fig. 5). ), the spring 12 will come into contact with the pin 1a and the claw 1 will spring up.
Furthermore, when the rook 3 rotates in the opposite direction (in the direction of the arrow in FIG. 4), the spring 12 contacts the pin 1b and engages the pawl 1 with the rook 3. The spring 4 can be omitted, and if this tension spring is omitted, the spring pressure of the spring spring 12 is reduced, and the sliding frictional resistance with the disc 9 can be reduced accordingly.

Further, the cross-sectional shape of the spring 12 is preferably circular, but it may also be polygonal. In this case, the shape of the groove 9a of the disc 9 should also be adapted to the shape of the spring 12. configured.

As mentioned above, this invention is based on a rook, a rotating shaft, a disk 9
A detaching member is provided that applies a moving force as the rotating body rotates, and when the rook rotates in the forward direction, the pawl is separated from the rook, and the structure is such that it does not come into contact with the rook, eliminating contact noise. This also has the effect of greatly increasing the lifespan of the claws and rooks due to wear.

Furthermore, since the pawls do not come into contact with the rook when rotating in the forward direction, the pawls do not wear out due to wear, and there is no need to increase the abrasion resistance of the pawls, which has the advantage that the pawls can be manufactured from inexpensive materials such as general castings and iron plates. There is.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a hoisting device equipped with a ratchet device;
2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view of a hoisting device equipped with a ratchet device according to an embodiment of the invention, and FIGS. In the cross-sectional view taken along the line C-C, FIG. 4 shows a state in which the pawl and rook are engaged, and FIG. 5 shows a state in which the pawl is flipped up. In the figures, the same reference numerals indicate the same or corresponding parts, 1 is a pawl, 3 is a rook, 4 is a tension spring, 9 is a disc, and 12 is a spring.

Claims (1)

[Scope of utility model registration request] It has a windmill with teeth formed on its outer periphery and a claw that is biased by a spring and engages with the teeth of the windmill.When the windmill rotates in the positive direction relative to the claw, the windmill and the claw are engaged. In a ratchet device in which the rotating body is rotated by loosening the lock, and when the rotating body attempts to rotate in the opposite direction or stop, the pawl and the windmill engage to prevent the rotation of the rotating body. The tip is slidably wrapped around a flip-up spring formed in an XS shape, and the tip of the flip-up spring is inserted between two pins provided on the claw. ratchet device.