JP4104403B2 - Chain hoist that can be used in reverse - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chain hoist that can be hung upside down and can be lifted and lowered while a hook attached to a chain hoist main body supports an object to be transported.
[0002]
[Prior art]
Conventionally, as an elevating means for lighting, sound equipment, etc. at construction work sites and theaters, the chain hoist body is reversed and the lower hook is hung on the ceiling, etc., and the object to be transported is suspended by the upper hook attached to the chain hoist body. A reverse hoisting chain hoist that is lifted up and down has been used. As this reverse hoisting chain hoist, for example, a configuration as shown in Japanese Patent Application Laid-Open No. 2001-72386 has been proposed.
[0003]
[Patent Document 1]
The reverse hoist chain hoist described in Japanese Patent Application Laid-Open No. 2001-72386 uses a hook attached to a chain lock body after a lower hook connected to a load side chain is hung on a ceiling portion of a construction site or the like. The object to be transported can be moved up and down together with the chain hoist body, but the chain bucket that houses the unloaded side chain is suspended at two points, the lower side of the chain hoist body and the side of the body, Since it is impossible to use it by reversing it, use a chain hoist with the standard specifications (when the upper hook attached to the chain hoist body is suspended from the ceiling, etc.) It was impossible and could only be used as a reverse suspension machine.
[0004]
In addition, as shown in FIGS. 7 to 9, the chain bucket 15 is inverted to the suspension point 21 of the frame 20 provided on the side of the chain hoist body as shown in FIGS. As shown in FIG. 7, the load-free chain can be directly accommodated in the chain bucket 15 from the load sheave 2 when used in the standard specification. As shown in FIG. 9, the chain bucket 15 is inverted, and the no-load side chain 8 is suspended downward from the load sheave 2 via the arcuate guide 3 above the load sheave 2 and accommodated in the chain bucket 15. Things have been proposed. Hereinafter, a conventional example of a chain hoist that can be used for both the standard specification and the reverse suspension specification will be described with reference to FIGS.
[0005]
In the figure, 1 is a chain hoist body, 2 is a load sheave, 3 is an arc guide that guides the no-load side chain when used in reverse, 7 is a load side chain, 8 is a no-load side chain, and 9 is a chain hoist body. 10 is a lower hook engaged with the load side chain, 15 is a chain bucket, 16 is a hook for hanging the bucket, and 21 is an arc guide 3 of the chain hoist 1. On the side, it is a hanging point of the bucket provided on the side of the chain hoist body 1. The chain bucket 15 is suspended from a suspension 21 provided at the end of the frame 20 extending to the arcuate guide 3 side of the chain hoist 1, and is suspended in a reversible manner at the suspension point 21. It can be used in both standard and reverse suspension specifications, enabling reversible use of chain hoists. However, as shown in FIG. 7, when the load of the chain accommodated in the chain bucket 15 becomes heavy during use in the standard specification, the chain hoist 1 is moved around the horizontal shaft 11 by the load of the chain 8. The chain feed port of the chain hoist body and the chain side green part 15a of the chain bucket 15 are separated from each other, and the no-load side chain 8 suspended from the chain hoist body is not accommodated in the chain bucket 15, 7 is dropped in the direction indicated by the arrow a, and the chain stored in the chain bucket 15 is dragged and dropped downward due to the weight of the chain that has fallen out of the bucket. In order to solve this problem, when the suspension point 21 is displaced to the left in the figure and the inclination of the chain hoist body 1 due to the chain load is suppressed, the predetermined interval is maintained so as not to interfere the bucket left side surface and the lower hook. Furthermore, since it is necessary to provide a bucket hanging hook at the center of the bucket, the bucket right side must be contracted to the left by the amount the suspension point has moved to the left, and the width of the bucket is narrowed accordingly. Thus, there is a problem in storing the no-load side chain during reverse hanging. Further, when the lower hook 10 is raised near the upper limit position shown in FIG. 8 during use in the standard specification, the no-load side chain feed port of the chain hoist 1 and the chain bucket green part 15a are connected to the chain hoist body 1 by the bucket load. Since they are separated due to the inclination, when the lower hook 10 swings as shown by an arrow a in FIG. 8, there is a problem that the hook 10 enters the chain bucket 15 as shown by an arrow b. .
[0006]
[Problems to be solved by the invention]
As described above, the conventional chain hoist that can be used in the standard specification and in the reverse suspension specification, the chain hoist is inclined to the chain bucket side due to the load of the chain bucket in which the chain is stored in the standard use. Since there is a gap between the chain feed port of the hoist and the green part on the chain side of the chain bucket, the unloaded chain hanging from the chain hoist has a problem that it falls without being stored in the chain bucket. When the side hook was raised, there was a problem of entering and exiting the chain bucket.
[0007]
[Means for Solving the Problems]
The present invention solves the above-described problems, and in a chain hoist that can be used in reverse suspension, when using reverse suspension, a bracket that guides the vertical movement of the no-load side chain delivered from the arc-shaped chain guide, A long hole is provided in the bracket, extends over the side of the chain hoist body and the lower side of the chain hoist body, and engages the bucket in a reversible manner. According to the present invention, at the time of use according to the standard specification, by setting the suspension point of the bucket hook as the lowermost end of the bracket, it is possible to reduce the inclination of the chain hoist at the time of no load, so that it is sent downward from the load sheave. The load-free chain can be accurately stored in the bucket, and a hook guide plate is provided on the upper green of the bucket to prevent the hook from entering and exiting, or the lower hook swings when the bucket upper green is at the upper limit position. It is possible to prevent the lower hook from entering the bucket by suspending the bucket so as to block the hook.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is delivered from the load sheave, the upper hook that is pivotally attached to the chain hoist body, the lower hook that is engaged with the load side chain that is wound around the load sheave, and the load sheave. In a chain hoist that can be used in reverse hanging, having an arc-shaped chain guide provided on the delivery side of the no-load side chain and a non-load side chain storage bucket that is reversibly attached to the chain hoist body. A bracket that guides the vertical movement of the no-load-side chain delivered from the arc-shaped chain guide, and a horizontal line that extends around the center of the chain hoist body on the side of the chain hoist body and below the chain hoist body. It is provided with a long hole that is extended and engages the bucket in a reversible manner. It is extremely easy to reverse the shaft, and when used in standard specifications, the suspension point of the hook for the bucket is the bottom end of the bracket, so that the inclination of the chain hoist can be reduced when there is no load. It has the effect | action which can accommodate correctly the no-load side chain sent out from a sheave below in a bucket.
[0009]
The invention according to claim 2 is characterized in that a long hole is provided in a flange formed by bending the tip of the bracket, and the work man-hour is provided by providing a long hole in the bracket for guiding the no-load chain. This has the effect of reducing the number of parts.
[0011]
The invention according to claim 3 is characterized in that a hook guide plate for preventing the hook from entering and exiting is provided on the chain storage bucket upper green, and the lower hook upper limit rises into the bucket of the lower hook. It has the effect | action which can prevent entering / exiting.
[0013]
Embodiment
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 is a front view showing an upper limit hoisting state when the chain hoist of the present invention is unloaded with standard load, FIG. 2 is a front view showing the hoisting state in FIG. 1, and FIG. FIG. 4 is a front view showing a suspended state of the chain hoist of the present invention during no-load reverse suspension, FIG. 5 is a front view showing the load hoisting state of FIG. 4, and FIG. 6 is a left side view of FIG. It is. In the figure, 1 is a chain hoist body, 2 is a load sheave, 3 is an arcuate guide portion that guides the unloaded chain when suspended upside down, and is fixed between a pair of brackets 12, 4 is a motor, and 5 is a deceleration Device, 6 is an electrical component box, 7 is a load side chain, 8 is a no load side chain, 9 is an upper hook used as a lower hook when hanging upside down, 10 is a lower hook used as an upper hook when hanging upside down, 11 is a horizontal axis for pivotally attaching the upper hook 9 to the chain hoist body, and 12 is a guide for the vertical movement of the no-load side chain 8 from the side when suspended upside down as shown in FIGS. A pair of chain guide brackets that are fixed to the attachment portions 22 and 23 that extend to the chain guide fixed in the chain hoist body 1. 13 is a flange formed by bending the end surface of the chain guide bracket 12 outward with respect to the arcuate guide 3, and 14 is provided on the flange 13. In FIG. 3, the upper end passes through the approximate center of the chain hoist body 1. On the horizontal line, the lower end is below the lower surface of the chain hoist body and is a long hole extending between the upper and lower ends, 15 is a chain bucket for accommodating the no-load side chain 8, 16 is a bucket hanging hook , 17 is a suspension part of the bucket, and 18 is a hook guide plate provided on the upper green of the bucket. 4 and 5, one end of the load side chain 7 is attached to the lower hook 10, and the load side chain 7 suspended from the lower hook 10 is connected to the load sheave 2 provided on the chain hoist body 1. Hanging on the lower half. The arcuate guide 3 is disposed obliquely above the load sheave 2 and is attached to the chain hoist body 1 in parallel with the load sheave 2. The unloaded side chain 8 drawn out from the load sheave 2 is guided directly to the chain bucket 15 when suspended in a standard manner, and is hung downward after being guided by the arcuate guide portion 3 when suspended vertically. Is housed in.
[0014]
A hook 9 is pivotally attached to the upper portion of the chain hoist body 1 by a horizontal shaft 11. Between the load sheave 2 and the lower hook 10, an upper limit switch 19 for inserting the load side chain 7 is provided. When the chain hoist body 1 rises to the upper limit during the hoisting operation of the electric chain hoist, the limit switch 19 is turned on. Actuates and the hoisting operation of the electric chain hoist is stopped.
[0015]
In the present embodiment, at the time of reverse hanging, the unloaded side chain 8 that hangs down from the chain guide 3 is guided from the side, so that there is at least a width that allows the chain to be inserted between the chain guide 3 and the chain guide 3. And a pair of chain guide brackets 12 provided on the side surface of the chain hoist body 1, and a flange 13 bent outward is provided on the outer end surface of the bracket 12. 1 is provided with a long hole 14 extending over a horizontal line passing through the approximate center of 1 and extending downward from the lower surface of the chain hoist body. The elongated hook 14 is hooked with a hook 16 for hanging the chain bucket 15. Therefore, when the chain hook 15 is used in the standard specification, the hook 16 for the bucket is positioned below the chain hoist body 1 in the long hole 14 provided in the flange 13 as shown in FIG. It is hung up. In this way, the suspension point of the bucket hook 16 is the lowermost part of the bracket 12, so that when the chain hoist 1 is inclined, the suspension point of the horizontal shaft 11 that is the suspension shaft of the upper hook 9 and the bucket hook 16. The distance X1 in the X direction is smaller than the distance X2 when the suspension point is at the upper part of the bracket, and the rotational force of the chain hoist body 1 centering on the horizontal axis 11 due to the load of the bucket 15 at no load and the chain The inclination angle of the hoist 1 is also reduced, and the distance between the feed port of the no-load side chain 8 suspended from the load sheave 2 and the upper green part of the bucket is also reduced, so that the no-load side chain 8 is accurately and smoothly inside the bucket. It is stored in. Therefore, unlike the conventional example, there is no problem that the no-load side chain slides down from the bucket when the bucket is stored. However, since the suspension point of the bucket 15 is at the lower end of the long hole and the bucket 15 is located below the main body frame 1, the upper green of the bucket 15 is separated from the lower surface of the main body, and the lower hook 10 is raised to a substantially upper limit. When this occurs, there is a problem that the lower hook 10 swings in and out of the bucket 15. Therefore, in the present embodiment, the hook guide plate 18 that blocks the swinging of the lower hook 10 when the upper limit is raised is provided on the lower hook side of the bucket 15. As another embodiment, the distance between the suspension handle 17 provided on the upper green part of the bucket 15 and the hook 16 for hanging the bucket is shortened, and the hook 16 is engaged with the chain hoist. The portion is positioned above the arc in which the lower hook 10 swings (not shown). In addition, since the hook 16 for hanging the bucket is hooked on a horizontal line passing through the approximate center of the chain hoist 1 of the long hole 14 provided in the flange 13 of the chain guide bracket 12 during upside-down hanging, FIG. As shown in FIG. 5, the no-load side chain 8 is stored in the bucket 15 from the substantially central portion of the bucket 15 in both cases of loading and no loading, so that the chain is prevented from falling off when the chain is stored. In addition, even when the chain hoist body 1 is tilted more than the state shown in FIG. 4 due to the weight of the bucket 15 during no-load operation, the hook guide plate 18 moves to the bucket 15 of the chain 8. The chain 8 is not dropped from the bucket 15 because it is also used as a guide plate for guiding the insertion of the bucket.
[0016]
In the present embodiment, the chain bucket is described as being hooked in the long hole provided in the flange. However, for example, a hole may be provided above and below the flange, and the same action as in the present embodiment. If it plays, it is not limited to a long hole.
[0017]
【The invention's effect】
The present invention relates to a chain hoist that can be used in reverse hanging, and a bracket that guides the vertical movement of a no-load side chain delivered from an arc-shaped chain guide when used in reverse hanging, A long hole that extends over the lower part of the chain hoist body and engages the bucket in a reversible manner makes it easy to reverse the bucket. By setting the lower end, it is possible to reduce the inclination of the chain hoist when there is no load, so that the no-load side chain sent downward from the load sheave can be accurately stored in the bucket, and the top of the bucket A hook guide plate that prevents the hook from entering and exiting is provided on the green, or the bucket It is possible to prevent the entry of the bucket of the lower hook by green to suspended the bucket into the elongated hole in Egil so shielding the rocking of the lower hook at the upper limit position.
[Brief description of the drawings]
FIG. 1 is a front view showing an upper limit hoisting state when a chain hoist according to the present invention is unloaded with standard suspension.
FIG. 2 is a front view showing a suspended state in FIG. 1;
FIG. 3 is a front view showing an upper limit hoisting state at the time of standard load hanging of FIG. 1;
FIG. 4 is a front view showing an upper limit hoisting state when the chain hoist of the present invention is hung upside down without load.
5 is a front view showing a load upper limit winding state of FIG. 4; FIG.
6 is a left side view of FIG. 5. FIG.
FIG. 7 is a front view showing a no-load standard suspension state of a conventional chain hoist.
8 is a front view showing an upper limit winding state in FIG. 7; FIG.
FIG. 9 is a front view showing a conventional chain hoist in an unloaded inverted state.
[Explanation of symbols]
1 Chain hoist body 2 Load sheave 3 Arc-shaped guide 4 Motor 5 Reduction gear 6 Electrical component box 7 Load side chain 8 No load side chain 9 Upper hook 10 Lower hook 11 Horizontal shaft 12 Chain guide bracket 13 Flange 14 Long hole 15 Chain Bucket 16 Bucket suspension hook 17 Suspension handle 18 Hook guide plate 19 Limit switch 20 Frame 21 Suspension points 22 and 23 Mounting portion

Claims (3)

  An upper hook hooked to the chain hoist body, a lower hook hooked to a load side chain wound around a load sheave, and an arc shape provided on the sending side of a no-load side chain sent from the load sheave A chain hoist with a chain guide and a non-load-side chain storage bucket that is reversibly attached to the chain hoist main body. A bracket that guides the vertical movement of the chain hoist, and is provided on the bracket and extends on the side of the chain hoist body on the horizontal line passing through the approximate center of the chain hoist body and below the chain hoist body, and the bucket is reversibly engaged. A chain hoist that can be used in reverse hanging, characterized by a long hole.   The chain hoist according to claim 1, wherein the long hole is provided in a flange formed by bending the tip of the bracket. The chain hoist according to claim 1, wherein a hook guide plate for preventing hooks from entering and exiting is provided on a green portion of the chain storage bucket.

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