JPS6131040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in lifting or hoisting machines such as chain blocks and winches, or lifting or pulling devices such as lever blocks.
A ratchet with an engaging force that is unaffected by changes in load automatically acts, and when the load is removed and there is no load, the ratchet pawl automatically disengages from the ratchet gear, forcing the output part to rotate. By making the input section freely rotatable both clockwise and counterclockwise, the output section and input section are directly connected when the above load is removed, especially when the structure is such that the output section and the input section are directly connected. The chain or cable can be moved quickly until a load is applied to improve work efficiency, and is a rotatable output with a chain or cable wrapped or suspended to forcibly pull other objects. a ratchet pawl that always faces in one direction due to the action of an elastic body and tries to engage with the ratchet teeth provided on the output part; and a ratchet pawl that always faces in one direction due to the action of a contracting body. The ratchet pawl is pressed to prevent engagement between the ratchet tooth and the ratchet tooth, and the swingable base that attaches the main body to the installation object releases the pressed ratchet pawl, and the ratchet pawl engages with the ratchet tooth. The invention relates to a lifting or towing device.

Next, referring to the drawings, an embodiment of the present invention will be explained in the case of a chain block.Although not shown, the shafts on both sides of the output section 1 hang a chain with a hook attached to the lower end for forcibly hoisting a load. 2 and 3 are rotatably supported by a bearing part 5 of the main body 4, one of the shafts 2 and 3 is made to protrude from the main body 4, and this shaft 3 has a large number of cylindrical shafts, for example, 18. The fixed rollers 6 are arranged in a cylindrical shape around the center of the shaft 3 and are fixed to an output rotating body 7 arranged at equal intervals, and the fixed rollers 6 are rotatable relative to the output rotating body 7. , the output side rotating body 7
A cylindrical holding member 8 is rotatably provided on the outer periphery of the
In this holding member 8, 17 movable rollers 9 and 10 are arranged in two rows with one less roller than the fixed roller 6 on the entire circumference. Provided with through-hole-shaped holding parts 11 and 12 that are movable and held so as not to move in the circumferential direction,
A ratchet tooth body 13 having ratchet teeth on the outer periphery is screwed onto the main body 4 side of the holding member 8. The holding member 8 and the ratchet tooth body 13 may be fixedly connected, but in this case, even if there is weak resistance in the output section 1 etc., a deceleration effect, which will be described later, may occur. Tsuba 14 of member 8
The input section 15 is sandwiched between the ratchet teeth 13 and the collar 14 using an elastic body such as a spring (not shown) to apply force in the direction of compressing the input section 15. The ratchet pawl 16 attached to the ratchet tooth body 13
It is preferable to set the screw direction of the ratchet tooth body 13 and the holding member 8 so that the tightening of the input part 15 by the collar 14 is loosened. As a result, when there is no load, the input section 15 and the output section 1 are directly connected, allowing operation without deceleration. The inner peripheral walls 17 and 18 of the input section 15 are connected to the holding section 11 of the holding member 8,
It is symmetrical on the left and right with respect to the eccentric circle or the center of the output part 5 so as to contact or come very close to the rollers 9 and 10 arranged on the outer periphery of the fixed side roller 6 of the output side rotating body 7 fitted in the output part 12, The center of the radius of curvature is located at a position away from the fixed straight line of the symmetrical shape, and the center of the radius of curvature is located at a position located on the fixed straight line and away from the center of the output part, and the radius of curvature is from the center of the output part 1 to the inner peripheral walls 17 and 18. It is also possible to have an approximately eccentric circular shape smaller than the distance, and good results have been obtained when the shape is shown in FIG. In this embodiment, the rollers 9 and 10 are arranged in two rows when viewed from the side, and when viewed from the front, the rollers 9 and 10 are arranged in two rows.
By arranging the center of the radius of curvature of the inner circumferential wall 18 opposite to the inner circumferential wall 17,
Although the rotation of the input section 15 relative to the output rotary body 7 was made smooth and the deceleration effect was ensured, the rollers 9 and 10 may be arranged in a line in the present invention. Furthermore, when implementing the present invention, the rollers 9 and 10 may be arranged in one row when viewed from the front, and the fixed roller 6 may be divided into two and arranged in two rows. In a chain block, the input section 15 may be a chain wheel on which a so-called hand chain is suspended.
8, the eccentric rings 19 and 20 are constructed separately from the input part 15, which is a chain wheel, and later the eccentric rings 1
9, 20 and the input section 15 may be coupled and fixed.

In the above-described configuration, the present invention applies force to the ratchet pawl 16, which is swingably attached to the main body 4, using an elastic body 21 such as a spring so that it always engages with the ratchet tooth body 13. A pressurized portion 23 is provided on the opposite side via the mounting pin 22 from the portion that engages with the ratchet tooth body 13,
By pressing this pressed portion 23 against the traction or pressure of the elastic body 21, the engaging portion 2 of the ratchet pawl 16 is
4 is removed from the ratchet tooth body 13.
On the main body 4 configured as described above, one side of the base body 25 is attached by a mounting shaft 26 so as to be able to swing freely within a certain range.
A contracting body 27 such as a coil spring is interposed on the opposite side of the body 6, and the base body 25 is always pulled in the direction of the body 4, and when the base body 25 is in a fixed state, it is connected to the body 4, that is, the output part 1 provided on the body 4. The structure is such that when a load is applied, the contracting body 27 expands and the main body 4 is separated from the base body 25. The contracting body 27 is a threaded rod 2
8, and attach a nut 29 to this threaded rod 28.
By screwing them together, the traction of the contraction body 27 can be adjusted. The base body 25 is provided with a pressing portion 30 that presses the pressed portion 23 of the ratchet pawl 16,
This pressing part 30 presses the pressed part 23 by the force of the elastic body 27, so that the engaging part 24 of the ratchet pawl 16 is released from the ratchet tooth body 13 regardless of the pulling force of the elastic body 21.

In addition, a hook part 31 is provided on the main body 4 so that the base 25 and the main body 4 are not separated by more than a certain limit.
5 is provided with a hanging part 32 that locks on this hanging part 31, and safety is ensured by preventing the base body 25 and the main body 4 from being separated by more than a certain limit. In the figure, 33 is a mounting plate that rotatably holds the ratchet gear 13 and the holding member 8 relative to the main body 4, 34 is a hook attached to the base 25, and 35 is a load such as a load chain wound around the output part 1. This is the guide roll for the gel chain.

In addition, the elastic body may be used not only for pulling, but also for compressing.

The present invention is as described above; for example, the base body is kept in a fixed state by hanging a hook from the top, and when a load is applied to the output part, the base body and the main body are separated as shown in FIG. Since it engages with the gear, it prevents the output section from reversing, ensuring safety when lifting or lowering cargo, and when the load is no longer applied to the output section, the ratchet pawl comes off the ratchet gear as shown in Figure 4. Therefore, the output section can be easily reversed forward or backward by operating the input section, and this effect is particularly effective when the input section and output section can be operated in a directly connected state during no-load conditions. .

Further, the engagement force between the ratchet pawl and the ratchet tooth is always constant because it is based on the elastic force of the elastic body. As a result, even if the load increases, there is no need to put any strain on the ratchet pawl and the ratchet teeth, which allows stable loading and unloading of loads, and prevents damage to the ratchet pawl and the ratchet teeth. It can also be prevented.

Note that although the sizes and shapes of each component may be slightly different in the illustrations, it can be implemented extremely easily by combining them.

[Brief explanation of the drawing]

The drawings show examples, and FIG. 1 is a perspective view in an exploded state when the present invention is embodied in a chain block, FIG. 2 is a front sectional view of a reduction mechanism portion, and FIG. 3 is a partial perspective view in an exploded state. FIG. 4 is a front sectional view in an unloaded state, FIG. 5 is a front sectional view in a loaded state, and FIG. 6 is a side sectional view. 1... Output part, 2 and 3... Shaft, 4... Main body, 5... Bearing part, 6... Fixed side roller, 7... Output side rotating body, 8... Holding member, 9 and 10... Roller, 11 and 12... Holding part ,
13... Ratchet tooth body, 14... Collar, 15... Input part, 16... Ratchet claw, 17 and 18... Inner peripheral wall,
19 and 20... Eccentric ring, 21... Elastic body, 22... Mounting pin, 23... Pressured part, 24... Engaging part, 25... Base body, 26... Mounting shaft, 27... Contractible body, 28... Threaded rod, 29 ...Nut, 30...Press portion, 31...Latching portion, 32...Hanging portion, 33...Mounting plate, 34...Hook, 35...Guide roll.

Claims (1)

[Claims] 1 A rotatable output part around which a chain or cable for forcibly pulling another object is wrapped or hung, and a ratchet tooth body provided on the output part that always faces in one direction by the action of an elastic body. The ratchet pawl that is about to be removed is always oriented in one direction by the action of the contracting body, and the ratchet pawl is pressed to prevent engagement between the ratchet pawl and the ratchet teeth, and the main body is attached to the installation object. A lifting or pulling device characterized in that a movable base is attached to the main body, and when a load is applied, the base releases the ratchet pawl pressed by the base so that the ratchet pawl engages with the ratchet teeth.