JPH0457594B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a lever-type hoisting traction device, specifically, a lever-type hoisting traction device, which can quickly pull out and pull back a chain hung on a load sheave when no load is applied. This invention relates to a lever-type hoisting traction device equipped with an idling device.

(Prior Art) Conventionally, a lever-type hoisting and traction device equipped with an idling device is already known, as shown in, for example, Japanese Patent Application Laid-open No. 157697/1983.

The idling device disclosed in this publication is provided between a drive member screwed onto a drive shaft and a driven member coupled to the drive shaft so as to be immovable in the axial direction. A spring is provided to counter the movement of the load sheave, and the action of this spring allows the load sheave to rotate freely, and the provision of the spring prevents insufficient tightening force of the brake section during light loads. This system is equipped with a brake tightening spring and a speed change mechanism that changes the axial pressing force of this spring.

In this device, when the load sheave is operated for free rotation, the pressing force of the brake part tightening spring is made weaker than that of the reversal spring by operating the change mechanism, and The action of the spring provides resistance to the movement of the driving member to the driven member, so that the brake part is not tightened, and as a result, the load sheave becomes in an idle state, and the chain is quickly pulled out or pulled back. This makes it possible.

(Problem to be Solved by the Invention) However, according to the conventional example as described above, even when the load is light, the clamping force of the brake part is not insufficient and the load can be lifted and unloaded by swinging the operating lever. However, it is necessary to use two types of springs: a spring for free rotation and a spring for tightening the brake part, and the axial direction of the spring for tightening the brake part is required. Since it is necessary to provide a changing mechanism to change the pressure, the structure becomes complicated, and the related control of the pressing force of two types of springs allows free rotation and braking operation under light loads. As such, the springs are required to have high precision, which poses the problem of complicating quality control.

The present invention enables the drive shaft to move in the axial direction without using a spring as in the prior art, and also restricts the axial movement of the drive member screwed onto the drive member, so that during free rotation operation, The present invention attempts to solve the above-mentioned problem by making it possible to move the drive shaft in the axial direction while restricting the axial movement of the drive member.

(Means for Solving the Problems) The present invention provides a drive shaft 5 that drives a load sheave 3 via a deceleration mechanism 6, a driven member 7 coupled to the drive shaft 5, and a screw thread for the drive shaft 5. a brake plate 9 and a brake pawl 11 interposed between the driven member 7 and the drive member 8;
and a claw body 1 that engages with the tooth portion 8a of the drive member 8.
4, and a feed handle 13 coupled to the shaft end of the drive shaft 5, the lever-type winding and traction device is configured such that the drive shaft 5 is movable in the axial direction, A regulating means for regulating the movement of the drive member 8 in the axial direction and moving the drive shaft 5 in the axial direction is provided, while the handle 13
The present invention is characterized in that a removable blocking means is provided between the drive member 8 and the drive member 8 to prevent the drive member 8 from sliding due to the rotation of the drive shaft 5.

(Function) When the load sheave 3 is operated to rotate freely, it is performed by rotating the drive shaft 5 using the feed handle 13, and the rotation of the drive shaft 5 causes the drive shaft 5 to rotate along the axis of the drive member 8. The brake part that has moved in the axial direction with its directional movement restricted is relaxed, and when the feed handle 13 rotates freely, that is, when the brake is relaxed, the blocking means prevents the drive member 8 from moving. Screwing is prevented and the drive member 8 is made to rotate integrally with the drive shaft 5, and this integral rotation allows the load sheave 3 to rotate freely in conjunction with the relaxation of the brake section described above. It will become.

(Embodiment) The illustrated lever type hoisting and traction device has a pair of first and second side plates 1 and 2 facing each other at a predetermined interval, and a cylinder having a load sheave 3 between these side plates 1 and 2. The shaft 4 is rotatably supported, and the drive shaft 5 is rotatably supported in the center hole of the cylindrical shaft 4, and there is a space between the protruding end of the drive shaft 5 on the one side plate 1 side and the load sheave 3. is from 1st gear to 4th gear
A speed reduction mechanism 6 consisting of gears is interposed so that the rotational power of the drive shaft 5 is transmitted to the load sheave 3 at a reduced speed. Further, a flange portion 7 is provided on the outer periphery of the protruding end portion of the drive shaft 5 on the other side plate 2 side.
Connecting a subordinate body member 7 consisting of a hub body having a
A drive member 8 having a toothed portion 8a is screwed to the outer side of the driven member 7, and brake plates 9, 9 and a brake ratchet 11 are provided between the driven member 7 and the drive member 8. At the same time, the second side plate 2 is provided with a reversal prevention pawl 12 that engages with the ratchet wheel 11 and fixes the ratchet wheel 11 to constitute a mechanical brake. A lever 15 with a mating pawl 14 is provided, and a feed handle 13 is supported outside the drive member 8 by serration fitting.

Therefore, in the lever-type hoisting and traction device configured as described above, the present invention is configured such that the drive shaft 5 is movable in the axial direction, and the axial movement of the drive member 8 is restricted. A restraining means is provided between the handle 13 and the drive member 8 to removably prevent the drive member 8 from spiraling due to rotation of the drive shaft 5. This means that a means has been established.

The regulating means is such that the lever 15 is rotatably inserted into an opening 18a formed on one side of a brake cover 18 that covers the mechanical brake in the side plate 2 and which receives the drive member 8, and the lever 15 is rotatably inserted in the longitudinal direction of the drive shaft 5. The lever 15 restricts the axial movement of the drive member 8 screwed onto the drive shaft 5.

That is, the lever 15 is assembled by screwing together a pair of lever bodies 16 and 17, each of which has peripheral walls 16a and 17a on the periphery of a vertically elongated plate, with a fixing bolt 15a, with the peripheral walls 16a and 17a butted against each other. 16 and 17 are connected, and through holes 16b and 17b for receiving the drive member 8 and support holes 16c and 17c for pivotally supporting the claw body 14 are formed on one end side of the length main body of the lever bodies 16 and 17. On the other hand, the tooth portion 8a of the drive member 8 interposed between the lever bodies 16 and 17 is set at an intermediate position in the axial direction of the drive member 8 and has a diameter larger than the outer diameter of the through holes 16b and 17b. The inner walls of the lever bodies 16a and 17a restrict the movement of the drive member 8 in the axial direction.

The lever 15 is supported in the opening 18a of the brake cover 18 by extending the edges of the opening 18a and the through-hole 16b of the lever body 16 outward in a cylindrical shape, thereby forming the respective cylindrical portions 18b and 16d. The cylindrical portion 16d of the lever main body 16 is inserted into the cylindrical portion 18b of the cover 18, and the ring 19 is fitted into each groove formed in the opposing surfaces of the cylindrical portions 16d and 18b. Brake cover 1
8 supports the lever 15 freely only in rotation.

Further, as the blocking means, the handle 13
A locking pin 20 movable toward the drive member 8 is provided at the drive member 8, and the pin 20 is selectively engaged with or disengaged from a locking hole 8b provided on the outer peripheral surface of the drive member 8, thereby locking the drive shaft 5. This prevents the driving member 8 from being screwed by the rotation.

In the embodiment shown in the figure, as shown in FIG. 3, the locking pin 20 is configured by inserting the tip of a pin body 21 having a swingable knob 22 into a cylindrical body 23. A bullet 24 is interposed between the tip side flange 21a of the pin body 21 to normally bias the pin body 21 toward the drive member 8, while the knob 2
2 is pulled as shown by the solid line in FIG. By moving the feed handle 13 so that the head 22 does not get in the way.
The structure is such that it can be maintained in a prostrate position.

Further, the driven member 7 is coupled to the drive shaft 5 by providing a groove 51 and a key groove 52 in the drive shaft 5, and fitting a pair of half support rings 53, 53 into the groove 51. The outer circumferences of these rings 53, 53 support the hub body of the driven member 7, and are fixed by a fixing key 54.

The present invention is constructed as described above, and in use, as is known, the fixing hook 10 is hooked onto a fixed member such as a pillar, and the driving member 8 is rotated forward or reverse by reciprocating the lever 15. Then, by normal rotation of the drive member 8, the drive member 8
spirals forward, and its thrust integrates the drive member 8, brake plates 9, 9, brake pawl wheel 11, and flange 7a, and the power of the drive member 8 moves from the drive shaft 5 to the deceleration mechanism 6 and the cylindrical shaft 4. The load is transmitted to the load sheave 3 via the load sheave 3, and by driving the load sheave 3, a load hooked to a hook fixed at one end of the load chain is lifted or pulled sideways.

Furthermore, when unloading the cargo, as is known, the drive member 8 is reversely operated to move the cargo suspended from the load chain onto the drive shaft 5 due to its gravity.
is reversed by the amount of reversal of the drive member 8, and the load is gradually unloaded.

When the load chain is pulled out to a predetermined length at the beginning of work, etc., the head 22 of the locking pin 20 is pulled as shown by the solid line in FIG.
1 from the locking hole 8b of the drive member 8, and with the reversing claw 14b of the claw body 14 locked in the tooth portion 8a of the drive member 8 as shown in FIG. Rotate clockwise or
Alternatively, pull the road chain to rotate the drive shaft 5 clockwise.

Then, since the driving member 8 cannot rotate or move in the axial direction, the driving shaft 5 rotates and moves in the opposite direction to the lever 15, and the flange 7a of the driven member 7 A gap a is created between the handle 13 and the brake plate 9, and when the handle 13 is rotated by a predetermined angle, the pin body 21 and the locking hole 8b align, and the handle 1 is automatically rotated.
3 and the driving member 8 to maintain the gap a.

Such a gap a allows the driven member 7 and the driving member 8 to be released from the interlocking relationship with the brake pawl wheel 11, and the load sheave 3 is connected to the deceleration mechanism 6, the driving shaft 5, the driven member 7, the driving member 8, and the feed handle. 1
3 and can be rotated freely.

In addition, when returning from the above-described free rotation state to a state where loading and unloading is possible, the pin body 2
1 from the locking hole 8b, and with the forward rotation claw 14a of the claw body 14 locked in the toothed portion 8a of the drive member 8 as shown by the dotted line in FIG. 5, the handle 13 is rotated counterclockwise, or By pulling the load chain and rotating the drive shaft 5 to the left, shifting the locking position between the pin body 21 and the locking hole 8b and eliminating the gap a, loading and unloading can be carried out as usual. It can be done.

Furthermore, when the locking pin 2 is pulled out from the locking hole 8b, the head 23 of the locking pin 2 can be kept in a lowered position relative to the feed handle 13 by swinging to prevent it from getting in the way or being damaged. It can be prevented.

In the previously described embodiment, as shown in FIG. On the outer periphery of 81a,
The brake presser body 81 is rotatably supported via a one-way rotation transmission mechanism 30 consisting of a pin and a spring that is integrated with the rotating member 82 when rotating in the downward direction, and the brake presser body 81 and the rotating member 82, a pair of friction plates 83, 8
3, an elastic member 84, a non-rotatable blocking plate 85 having a locking hole 8b, and a friction adjustment member 86. The friction connection may be slipped to prevent rolling up.

(Effects of the Invention) As described above, the present invention configures the drive shaft 5 to be movable in the axial direction, restricts the axial movement of the drive member 8, and restricts the movement of the drive shaft 5 in the axial direction. In addition, a blocking means is provided between the handle 13 and the drive member 8 to removably prevent the drive member 8 from sliding due to the rotation of the drive shaft 5. Even when the load is light, it is possible to lift and unload the load by swinging the lever without insufficient tightening force of the brake part, and it also allows for free rotation operation.
The structure is extremely simple compared to the conventional example that uses an idling spring and a spring for tightening the brake part, and when a high degree of accuracy is required to ensure that there is no variation in the spring force of the two springs. Parts management is also easy.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view showing an idle state, Fig. 3 is a longitudinal sectional view of the locking pin, and Fig. 4 is an explanatory diagram of the same state of use. ,
FIG. 5 is an explanatory diagram showing the engagement position of the pawl body during operation to the operating state and the free rotation state, and FIG. 6 is a longitudinal sectional view of the main part showing another embodiment. 3... Load sheave, 5... Drive shaft, 6... Reduction mechanism, 7... Followed member, 8... Drive member, 8a... Teeth,
9...Brake plate, 11...Brake pawl wheel, 13...Feed handle, 15...Lever.

Claims (1)

[Claims] 1 A drive shaft 5 that drives the load sheave 3 via a deceleration mechanism 6, a driven member 7 coupled to the drive shaft 5, and a drive member 8 screwed onto the drive shaft 5.
, a brake plate 9 and a brake ratchet wheel 11 interposed between the driven member 7 and the driving member 8, and a lever 15 having a pawl body 14 that engages with the teeth 8a of the driving member 8. , a lever-type winding and pulling device comprising a feed handle 13 coupled to the shaft end of the drive shaft 5, in which the drive shaft 5 is configured to be movable in the axial direction, and the drive shaft 5 is movable in the axial direction. A regulating means for regulating the movement of the drive shaft 5 and moving the drive shaft 5 in the axial direction is provided, and the drive member 8 is screwed between the handle 13 and the drive member 8 by rotation of the drive shaft 5. A lever-type winding-up traction device characterized by being provided with a blocking means for releasably blocking the.