JPH0374727B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a shovel date par bailing device, particularly for lifting date pars higher above a given machine before being obstructed by a boom tip pulley than before assembly. This relates to a shovel date par bailing device that can be used.

Conventional Technology Power shovels and steam shovels have been used for excavation for over a century. Although many design improvements have been made over the years, it is clear that the problem of lacking the ability to raise the date parr to the maximum possible height has long been present.

Generally, a power shovel has a lifting boom attached to a main drive, with a date paddle handle pivotally mounted in the middle of the boom. A cable pulley is provided at the outer end of the boom, through which the cable is threaded to connect with the bail of the date parr. The cable is connected to the bail of the day parr by a traction device that conventionally limits the height to which the day parr can be lifted. For example, US Patent No. 2034854 states:
It can be seen that the lifting traction section actually protrudes above the slack part of the U-shaped bail. Such an arrangement is commonly used today in which the lock leg is welded to the bail slack to provide a pivot for the tow section.

PROBLEM SOLVED BY THE INVENTION Over the years, other means have been attempted to improve the ability to lift date pars. If it is high enough to lift the date par against the lifting boom,
It will be appreciated that the embankment can be raised so that the machine can be operated and loaded and unloaded from a height suitable for large trucks, thereby extending the range of performance of a given machine. One option is to have a D-ring that can practically connect the cable to the bail at the slack level, but this option is rejected in excavation technology because it causes increased wear on the lifting cable. It was done.

SUMMARY OF THE INVENTION The present invention eliminates the attendant drawbacks of conventional D-ring constructions by using a lifting traction section rotatably mounted on the circular portion of the bail slack. Substantially maximum lifting capacity is achieved. Preferably, the cable connection is in the form of a D-ring, as is well known, to provide the shape of the lifting traction just above the bail, thereby raising the day parr to the maximum possible height. can.
Even if the operator knows the D-ring connection for the lifting cable and has a central circular section in the bail slack, what brings the two concepts together to provide the advantage of maximum lifting capacity of the date parr is There was no one there.

Other objects and advantages of the invention can be found in the detailed description.

The invention will now be described in conjunction with the accompanying drawings.

Embodiment Referring first to the embodiment given and to FIG. 1, the power shovel 10 includes a pulley 1 at the outer boom end.
A lifting boom 11 is provided having an inner end of the lifting boom 11 attached to the driver's cab 13 .

A day par handle 14 with a date par 15 provided at the outer end is pivotally connected to the lifting boom 11 and a bail 16
is provided. Lifting cable 17 is connected to bail 1
6, and is hung on a pulley 12 to be connected to a winch (not shown) of the main drive machine of the power shovel 10. This situational description in this invention is generally general and has been used in power shovel construction for many years.

The bail 16 can be seen in enlarged form in FIG. 2 and has a generally U-shaped member, the bail being shown only schematically to save space in the drawing. The bail 16 has a pair of legs 18 and is provided for pivotal connection at a lower end 19 for pivotal engagement with opposite sides of the date parr 15.
The bail 16 also has an integral connecting slack 20 extending between the two depending legs 18.

The connecting slack portion 20 has a central cylindrical portion 21, as can be seen from a consideration of the central portion of FIG. Preferably, bail 19 is cast or formed to include a central cylindrical portion 21 . A lifting traction part 22 is rotatably attached to the central cylindrical part 21 of the bail 19.

Parts of the lifting traction section 22 can be further understood from a consideration of FIG. 4, which is shown in exploded form. In Figure 4, the code 22 seen in the lower right hand part
a indicates a roughly U-shaped bracket 22a which partially surrounds the central cylindrical portion 21 of the connecting slack portion 20. Bracket 22a
has a pair of upright arms 23, and a fourth
The top is closed by a closure 24 as seen at the top of the figure.

In the embodiment given, the closure body 24 is provided with a depending portion 25 so as to form an arcuate circular shape on the inside. Bracket 2 with similar shape
2a has an inner surface 26 formed in a similar shape. These members are the central cylindrical part 21 of the lifting traction part 20.
A corresponding surface is provided for mounting a split cylindrical bearing 27 surrounding the cylindrical bearing 27. In the embodiment, four bolts 28 are used to secure closure 24 to bracket 22a.

Each arm 23 of the bracket 22a is provided with a D-ring 30 on the outside with respect to the lifting traction section 20. D-ring 30 is actually half of a pulley.
The looped bottom end of the cable is received as indicated at 17a in FIG. The open bottom side of each D-ring 30 is closed by an arcuate member 31 bolted to the closure body 24 by a bolt 32.

A bumper device 33, which can be seen in FIG. 3 when approaching the pulley 22, is provided on the upper surface of the closure body 24.
As shown in FIG. 3, it is suitably curved in an arc shape corresponding to the curvature of .

Several substantial advantages are achieved through the use of this invention. These advantages include reduced weight, reduced rope management, fewer bush pivots, and the ability to raise the dipper closer to the boom pulley for easier material loading and clearance to the track.

Although the foregoing description provides a detailed description of embodiments of the invention for the purpose of understanding, many changes within the details herein may be made without departing from the spirit and scope of the invention. This can be done by a person skilled in the art.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional schematic view of the front end of the power shovel, Figure 2 is an enlarged view taken along line 2-2 in Figure 1 showing the bail in front view, and Figure 3 is the 3 in Figure 2.
FIG. 4 is an exploded perspective view of the lifting traction section of the invention shown in conjunction with a portion of the bail indicated in dotted lines; FIG. In the figure, 10: power shovel, 11: lifting boom, 12: pulley, 14: date par handle, 15: date par, 16: bail, 17: lifting cable,
18: Leg, 20: Connecting slack part, 21: Central cylindrical part, 22: Lifting traction part, 23: Arm, 24:
Closed body, 30: D ring, 33: damper device.

Claims (1)

[Scope of Claims] 1. A U-shaped bail that is pivotally connected to the day par and has a pair of legs that are integral with the connecting slack part, and the longitudinal center of the connecting slack part has a cylindrical cross section, which is connected by cable to a boom with a pulley. It has a pair of arms having a U-shaped bracket rotatably engaged with the cylindrical cross section, a cable pulley attached to the arms, and a closing body connected between the arms so as to form a connecting slack portion inside the cylindrical cross section. Shovel date par bailing device with lifting traction section. 2. A shovel date par bailing device according to claim 1, wherein a bumper device is provided on the closure body to engage the pulley of the boom when the date par is raised to its maximum position. 3. A shovel date per bailing device according to claim 1, wherein opposing arcuate cylindrical inner surfaces are provided on each bracket and closure, and a sleeve bearing inserted between the inner surfaces and the connecting slack. 4. Claim 1, in which D-rings for receiving loop-shaped cables are provided on each bracket arm.
The shovel date par bailing device described in Section 1. 5 Connect each D to provide a path for the looped cable to pass through.
5. A shovel date par bailing device according to claim 4, wherein an arcuate member is removably attached to the lifting traction portion outside the ring. 6 comprising a bail having a central cylindrical portion and a lifting traction portion rotatably connected to the central cylindrical portion;
A shovel day par bailing device in which the lifting traction part extends only slightly above the cylindrical part and has a lifting cable connection on each side of the bail, which allows the day par to be brought into close proximity to the cable boom.