JPH025671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a lever-type hoisting machine used to raise and lower cargo by operating a control lever.

BACKGROUND ART Examples of operating levers in which the operating lever is separated into an inner lever component and an inner lever component include:
The one disclosed in Japanese Utility Model Application Publication No. 58-99289 is known. The device disclosed in this publication is a lever-type small hoisting and traction device in which a fixed support ring is bent on the side of a metal plate brake cover, and is rotated on the side of the base end of a metal plate operation lever. The movable support ring is bent and formed, and the rotary support ring is fitted into the fixed support ring so that it can rotate freely and not move in the longitudinal direction of the drive shaft, and the cargo can be raised and lowered by operating the operating lever. This is what we do.

Problems to be Solved by the Invention In the conventional device, the rotation between the fixed support ring formed on the side of the brake cover and the rotation support ring formed on the side of the base end of the operating lever is limited. There is some looseness in the connecting part due to the finishing accuracy during manufacturing. Therefore, when the unloaded chain is moved up and down to freely change its position while the drive member is rotated in the direction away from the friction member, the drive member rotating with the drive shaft is operated. When the lever comes into contact with the outer lever component and is prevented from rotating, the drive member is moved by the rotating drive shaft toward the friction member and returned to the braking state, thus removing the drive member from the friction member again. There was an inconvenience that the position of the chain could not be changed freely unless it was rotated in the direction of separation.

Means for Solving the Problems This invention has been made to solve the above problems, and includes rotating a drive shaft by operating a control lever within a certain angle range, and rotating a drive shaft through a load sheave attached to the drive shaft. In a lever-type hoisting machine that moves the lower hook for hanging cargo in the vertical direction, the inner and outer lever cases that form the operating lever are provided separately, and the inner lever case has an opening in a circular protrusion. The locking surface is locked in an annular notch formed in the periphery of the side surface on the ratchet side of the pressing member, and the circumferential surface of the circular protrusion is slidably fitted onto the outer peripheral surface of the pressing member. In addition, the opening of the outer lever case that covers the drive member is held by the inner lever case so that it does not come into contact with the operating grip of the drive member.

Effect Since the present invention has the above configuration, when the unloaded chain is moved vertically and its position is freely changed while the drive member is rotated in the direction away from the friction member, the movement of the chain Even if vibrations are transmitted to the operating lever, the inner lever case is slidably fitted to the pressing member by the locking surface with the opening and the circumferential surface perpendicular to the locking surface, and the ratchet wheel adjacent to the pressing member is engaged with the inner lever case. Since movement in the axial direction is thus prevented, the outer lever case held by the inner lever case no longer comes into contact with the drive member and does not interfere with the free repositioning of the chain.

Embodiment In FIG. 1, a load sheave 3 is rotatably held in the center of side plates 1 and 2 that are kept at a constant interval. Reference numeral 4 denotes a drive shaft that is integrally attached to the load sheave 3, and the drive shaft 4 has a right-handed thread 4a on a shaft portion protruding from one side plate 2. A driven member 5 is screwed into the drive shaft 4 on the side closer to the side plate 2, and a drive member 6 having a switching gear 6a is screwed on the side farther from the side plate 2.

A pressing member 7 is fitted into the boss portion 5a of the driven member 5 between the driven member 5 and the driving member 6, and the pressing member 7 has a claw on the boss portion 7A on the driven member 5 side. A wheel 8 and a friction member 9 are attached, and a friction member 10 is attached to the boss portion 7A on the drive member 6 side. As shown in FIG. 3, the ratchet wheel 8 has three engaging recesses 8a formed in the radial direction at equal intervals on the inner circumferential surface of the portion that is attached to the pressing member 7. As shown in FIG. On the other hand, a ratchet wheel 8 is provided on the outer peripheral surface of the boss portion 7A of the pressing member 7.
Three engaging protrusions 7a with slightly shorter lengths in the circumferential direction are formed to allow reciprocating rotation in the rotational direction within the engaging recesses 8a (Fig. 4a, Fig. 5). In addition, an annular notch 7b of a constant depth is provided on the outer circumference of the side surface in contact with the ratchet wheel 8. A spring 11 that presses the driving member 6 outward with respect to the driven member 5 is installed in the through hole of the pressing member 7 fitted into the driven member 5 . The drive shaft 4 is provided with a small-diameter threaded portion 4b at the right end, and a washer 12 held by a nut 13 that is screwed onto the small-diameter threaded portion 4b.
prevents the drive member 6 rotated in the loosening direction from falling off the drive shaft 4.

Reference numeral 14 denotes a shaft fixed to the upper part of the side plates 1 and 2, and a ratchet pawl 16 that is pressed toward the ratchet wheel 8 by a spring 15 is attached to a portion of the shaft 14 protruding from the side plate 2. This prevents the ratchet wheel 8 from reversing when loading and unloading the load. Further, an upper hook 18 is provided on the shaft 14 between the side plates 1 and 2 via a connecting fitting 17. A load chain 19 is wound around the load sheave 3, and a lower hook 21 for hanging cargo is connected to the lower end of the load chain 19 via a connecting fitting 20.

The drive member 6 has a switching gear 6a portion accommodated within the operating lever 22. This control lever 2
2 is composed of an inner lever case 23 and an outer lever case 24 that are formed separately. The inner lever case 23 has a circular shape that includes a circumferential surface 23a that slides on the outer peripheral surface of the pressing member 7 and a locking surface 23b that has a circular opening 23c that is locked in the annular notch 7b of the pressing member 7. A protruding part is formed, and the inner lever case 23 has an outer peripheral part formed on the circumferential surface 2.
It is bent at right angles in the direction opposite to the protruding side of 3a. The outer lever case 24 is integrally connected to the inner lever case 23 by a plurality of screws 25 and nuts 26.
A circular opening 24a is provided in a portion corresponding to the operation grip 6b, through which the operation grip 6b is inserted without contact.

A rotational direction switching pawl 28 rotatably held by a shaft 27 with respect to both lever cases 23 and 24 is housed in the operating lever 22 on the lower side of the drive member 6 . Reference numeral 29 denotes a pressing member that urges the lower end of the rotational direction switching pawl 28 upward by a spring 30. The switching pawl 28 is connected to the switching gear 6 of the drive member 6.
Press a at all times. Also, on the right side of the side plate 2,
A brake cover 32 that covers the driven member 5, the friction member 9, the ratchet wheel 8, and the ratchet pawl 16 that engages with the ratchet wheel 8 has a plurality of screws 33 and nuts that keep the side plates 1 and 2 at a constant interval. 34 so that it does not come into contact with the inner lever case 23.

Since this embodiment is constructed as described above, when a load is applied to the lower hook 21 with the switching pawl 28 locked to the switching gear 6a, the load sheave 3 and the load sheave 3 are integrally attached to the lower hook 21. The drive shaft 4 is slightly rotated clockwise when viewed from the left side of FIG. Since the thread 4a of the drive shaft 4 has a right-handed thread, when the drive shaft 4 rotates slightly, the drive member 6, which is threaded onto the screw 4a but is prevented from rotating by the switching pawl 28, moves in the direction of the side plate 2, pressure is applied to the pressing member 7, ratchet wheel 8, and friction member 9 via the friction member 10, and the surface of the driven member 5, which is fixed in position by the stepped portion of the drive shaft 4, and Braking force is also applied during this period. Moreover, at this time, since the ratchet wheel 8 is prevented from reversing by the ratchet pawl 16, neither the drive shaft 4 nor the load sheave 3 rotates after a slight rotation, and the load remains applied.

When the operating lever 22 is operated clockwise in this state, the rotation direction switching pawl 28 rotates the drive member 6 in the load lifting direction, so that the friction member 10, the pressing member 7, and the pressure member 7, which are rotated together by the drive member 6,
The ratchet wheel 8, the friction member 9, and the driven member 5 rotate the load sheave 3 in the load lifting direction and move the load suspended from the lower hook 21 to the operating lever 22.
Lift by the amount of operation. On the other hand, when the rotational direction switching claw 28 is engaged with the switching gear 6a in the opposite manner, the drive member 6 is moved to the right by the operation of the operating lever 22, and the friction member 10 is moved to the right.
Therefore, the friction member 10, the pressing member 7, the friction member 9, and the driven member 5 are rotated together with the drive shaft 4 in the direction of unloading the load by the load suspended from the lower hook 21, and the switching is performed. Claw 2
The drive member 6 whose rotation is prevented by the drive shaft 8 is pressed by the friction member 10 and moves the cargo downward until the rotation of the drive shaft 4 is stopped.

In addition, when changing the position of the load chain 19 freely in an unloaded state with no cargo hanging from the lower hook 21, first move the rotation direction switching pawl 28 to the neutral position shown in FIG. 1 using the handle 31. position and disengages from the switching gear 6a. Next, when the operating grip portion 6b of the drive member 6 is grasped and rotated counterclockwise, the drive member 6 is moved away from the friction member 10 with the help of the biasing force of the spring 11. When the movement of the drive member 6 is stopped by the washer 12 and you release your hand from the operation grip part 6b, the drive member 6, which is separated from the friction member 10 and released from the braking force, moves through the drive shaft 4. Since it idles together with the load sheave 3, the position of the lower hook 21 connected to the load chain 19 can be quickly and easily moved to any desired position.

Moreover, in this embodiment, the pressing member 7 is a ratchet wheel 8.
The outer lever case 24 of the operating lever 22 has a circumferential surface 23a and a locking surface 23b, which are at right angles, connected to the slightly long outer circumferential surface of the pressing member 7 and an annular cut. Since it is firmly held by the inner lever case 23 which is in sliding contact with the notch 7a and is prevented from moving in the axial direction by the ratchet wheel 8, when the position of the load chain 19 is changed,
The operating grip portion 6b of the rotated drive member 6 comes into contact with the opening 24a of the outer lever case 24, and the drive member 6 is moved toward the side plate 2, thereby reliably preventing the braking action from exerting on the rotation of the drive shaft 4. be able to.

Therefore, when changing the position of the load chain 19 in an unloaded state, the drive member 6 is moved once to the friction member 1.
This can be done quickly and easily by moving in a direction away from 0.

Effects of the Invention The present invention provides a lever-type winding machine in which inner and outer lever cases forming an operating lever are provided separately, and a locking surface with an opening of a circular protrusion formed on the inner lever case is connected to a locking surface of a pressing member. The inner circumferential surface of the circular protrusion is slidably fitted to the outer circumferential surface of the pressing member, and the outer circumferential surface that covers the drive member is engaged with an annular notch formed on the periphery of the side surface of the vehicle. Since the opening of the lever case is held by the inner lever case so that it does not come into contact with the operating grip of the drive member, when there is no load, simply moving the drive member away from the pressing member allows the load chain to be moved. Repositioning can be done quickly and easily.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of one embodiment of the present invention, FIG. 2 is a right front view of the same, FIG. 3 is a plan view of the ratchet wheel, and FIG.
The figures are drawings of the pressing member, where a is a plan view, b is a longitudinal cross-sectional view, Fig. 5 is a longitudinal cross-sectional view showing the engagement relationship between the drive shaft, the pressing member, the ratchet wheel, and the ratchet pawl, and Fig. 6 is the inner side. In the drawings of the lever case, a is a longitudinal side view, b
is the same right front view. 3... Load sheave, 4... Drive shaft, 6... Drive member, 6b... Operation grip, 7... Pressing member, 7b... Annular notch, 8... Ratchet wheel, 21... Lower hook, 22...
Operation lever, 23...Inner lever case, 23a...
Circumferential surface, 23b...locking surface, 23c...opening, 24...
Outer lever case, 24a...opening.

Claims (1)

[Claims] 1. In a lever-type hoisting machine in which a drive shaft is rotated by operating a control lever within a certain angle range, and a lower hook for hanging cargo is moved vertically via a load sheave attached to the drive shaft, the operation Separate inner and outer lever cases forming a lever are provided, and the locking surface with an opening of the circular protrusion formed on the inner lever case is connected to an annular notch formed around the side surface of the pressing member on the ratchet side. At the same time, the inner circumferential surface of the circular protrusion is slidably fitted to the outer circumferential surface of the pressing member, and the opening of the outer lever case that covers the drive member is brought into contact with the operating grip of the drive member. This lever-type winding machine is characterized by being held in an inner lever case to prevent it from falling.