JPH0421862Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is an automatic method for joining an upper drive casing and a removable lower casing, which is used to install earth retaining wall plates, etc. in earth retaining construction. This relates to locking devices.

"Prior art and its problems" The upper drive casing and the removable lower casing are joined together, excavated, and then this wall plate is installed as is (leave-in method), and the wall plate for earth retaining is installed all along the boundary line. The earth retaining work that installs the earthworks has shown excellent effects in terms of effective use of land.

However, in conventional devices of this type, in order to join the upper drive casing and the removable lower casing, the upper drive casing is lifted by a crane, etc., and then the lower casing is lifted by the same crane or another crane. The method used was to join the lower casing to the upper drive casing, and then insert a locking pin into a connecting metal fitting that spanned between both casings to integrate the two. Because of this, the above operation is carried out by carrying a locking pin to the place where it is lifted, which requires work at heights, which is extremely dangerous, troublesome, and reduces work efficiency. There are problems such as getting worse.

``Means for Solving the Problems'' Therefore, in order to solve the above-mentioned problems, the present invention automatically locks the removable lower casing when it is to be locked when joining the upper drive casing. However, in the case of unlocking,
It has a structure that requires manual operation, and provides safety and a reliable locking device.The gist is that the upper end of the upper drive casing is equipped with a pair of insertion protrusions, a cylinder, and a drive device. A set of automatic locking devices used to join a removable lower casing provided in A bifurcated knob member opening at the lower surface to be picked, a sheath tube provided in a direction perpendicular to the opening direction of the knob member, and an inverted L-shaped notch groove opened in the sheath tube;
An operating rod inserted into the notched groove and guided by the notched groove, a spring installed in the sheath tube that biases the operating rod toward the knob member, a through hole of the knob member, and a sheath. It consists of a locking rod that slides on the pipe, and at the time of the connection, the operating rod is pressed by the upper end of the removable lower casing, and at the same time moves from the open part of the notched groove to the locked part via the notched part, The tip of the locking rod reaches the locking hole formed in the rib plate of the lower casing and the through hole of the knob member, and is automatically locked. In order to release the lock from this locked state, the lock lever must be operated by manual means in the opposite manner to that described above, and the lock lever is constructed so that it cannot be released in any other way.

"Operation" When joining the removable lower casing to the upper drive casing equipped with a drive device for driving a bucket or the like, first lift the upper drive casing with a crane or the like, and then let the upper drive casing hang down. After that, when the lower casing is lifted by the same crane or another crane and brought close to the already suspended upper drive casing, the upper end of the lower casing is guided by the insertion leg provided on the upper drive casing, and The rib plate of the casing is inserted into a generally U-shaped knob with a downward opening forming an automatic locking device provided at the lower end of the upper drive casing. In addition, a sheath tube is provided in a direction perpendicular to the opening direction of this knob member,
An operating rod that automatically or manually operates a locking rod slidably provided on the sheath tube is inserted into an inverted L-shaped notch groove provided in the sheath tube. Therefore, as the lower casing rises, this operating rod is pressed by the upper end of the lower casing, and when guided from the open part of the notch groove to the lock part via the notch part, the lock rod is moved to the sheath. Pressed by the repulsive force of the spring provided in the tube, the tip of the locking rod reaches the locking hole formed in the rib plate of the lower casing and the through hole of the knob member, and is attached to and detached from the upper drive casing via the locking rod. The lower casing of the equation is locked. In this locked state, the locking lever is always urged toward the through hole by the repulsive force of the spring, so that the locked state will not be released unnecessarily.

In addition, if you want to release the lock from this locked state, after lowering the suspended upper drive casing and lower casing to the ground (of course, it is possible to do so while they are still suspended), press the spring manually. In this manner, the operating lever is returned to the open part of the cutout groove, and when it is stopped at the open part, the lock is released. Since opening can be performed only by manual operation in this way, there is no chance of opening accidentally due to an erroneous operation inside the excavator.

``Embodiment'' An embodiment of the present invention will be described in detail below based on the drawings. 1 is a substantially semi-elliptical shape having a chain guide 3 around the motor 2 suspended from a crane (not shown). The upper drive casing 1 is provided with a drive gear 4 fixed to the output shaft of the motor 2, and a drive gear 4 extending from the lower end is provided on both edges of the lower end of the upper drive casing 1. Insertion legs 5, 5 for inserting the lower casing, which will be described later, are provided, respectively. The tips of the insertion legs 5, 5 are slightly tapered to ensure that the lower casing 20 can be inserted easily. A pair of cylinders 6 are provided at the lower end of the upper drive casing 1, and piston rods 6a, 6a extend from the upper drive casing 1. Thereby, the gap A formed between the upper drive casing 1 and the lower casing 20 is expanded or contracted, and the tension of the chain 7 wound around these is adjusted.

In the figure, reference numerals 8 and 8 indicate locking devices fixed to the free end sides of the piston rods 6a and 6a, and these locking devices 8 and 8 are separated from the upper drive casing 1 as the piston rods 6a and 6a move forward and backward. The configuration is such that they approach each other. The configuration of the locking devices 8, 8 is (as shown in FIG. 1, the locking devices 8, 8 are symmetrical but have the same configuration, so for convenience, the configuration of one side will be explained.) , a bifurcated knob member 10 with a downward opening 9 fixed to the free end side of the piston rod 6a; a through hole 11 bored in the knob member 10 in a direction perpendicular to the opening 9; 1
A sheath tube 12 having a tubular shape facing in the same direction as the through hole 11 provided in the sheath tube 12, an inverted L-shaped notch groove 13 bored in the sheath tube 12, and a notch groove 13 inserted into the notch groove 13, which will be described later. A bent operating rod 14 fixed to a locking rod and a sheath tube 12 that controls the return of this operating rod 14
a spring 15 provided therein; and a locking rod 1 located between the sheath tube 12 and the flange 16, which moves into the through hole 11 of the knob member 10 when the locking device 8 is locked.
It consists of 7. Then, when the lower casing 20 is guided by the insertion legs 5, 5 of the upper drive casing 1 and approaches the upper drive casing 1, the operating rod 14 is inserted into the lower casing 20.
The operating rod 14, which was pressed by the upper edge of the notch groove 13 and located in the open portion 13a of the cutout groove 13, rises upward as shown in FIG. When the operating rod 14 is further pressed by the upper edge of the lower casing 20 from this state, the operating rod 14 is pushed into the notched portion 13 of the notched groove 13.
When reaching point b, the notched groove 13 no longer restricts the operating rod 14, so the operating rod 14 reaches the lock portion 13c of the notched groove 13 by the repulsive force of the spring 15, and the lock that cooperates with the operating rod 14 Rod 17
is the through hole 11 and the rib plate 2 of the lower casing 20
The locking device 8 is locked by being inserted between the locking hole 22 drilled in the locking device 8 and the locking hole 22 formed in the locking device 8.
Note that the locking device 8 can only be released manually; that is, by moving the operating rod 14 from the locking portion 13c to the open portion 13a, the locking rod 17 can be removed from the through hole 11 and the locking hole 22. be done. That lock is released. In the figure, 23 indicates buckets provided at appropriate intervals on the chain 7.
24 is a driven gear provided in the lower casing 20.

By providing a pair of locking devices 8 as shown, it is possible to prevent the lower casing 20 from swinging laterally with respect to the upper drive casing 1.

``Effects of the Invention'' Since the present invention has the configuration described in detail above, it has the advantage that when simply joining the lower casing to the upper drive casing, the two can be joined together via the locking device at the same time. Further, since the locking device is automatically locked, there is no need to climb up to a high place when joining, which contributes to safety, reliability, and speed of work. Furthermore, the lock is automatic,
Since unlocking is done manually, there is no erroneous operation, and it is safe and reliable, which is very effective.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a perspective view of the upper drive casing seen from below, FIG. 2 is an enlarged perspective view of the locking device, FIG. 3 is a sectional view of FIG. 2, and FIG. FIG. 4 is a side sectional view of the main parts showing the relationship between the upper drive casing and the lower casing, and FIG. 5 is a front sectional view of the main parts showing the relationship between the upper drive casing and the lower casing. 1... Upper drive casing, 2... Motor, 3
...Chain guide, 4...Drive gear, 5,5
...Insertion leg, 6, 6...Cylinder, 7...Chain, 6a, 6a...Piston rod, 8,8
...Lock device, 9,9...Opening, 10,10...
...Knob member, 11, 11...Through hole, 12, 12
... Sheath tube, 13, 13 ... Notch groove, 14, 14 ...
...Operation rod, 15,15...Spring, 16,16...
Flange body, 17, 17... Lock rod, 20... Lower casing, 22, 22... Lock hole, 21, 21
...Rib plate, 23...bucket, 24...driven gear, A...gap.

Claims (1)

[Claims for Utility Model Registration] An automatic locking device used to join a removable lower casing provided at the lower part of an upper drive casing, which is provided with a pair of insertion legs, a cylinder, and a drive device. The automatic locking device includes a bifurcated knob member provided at the lower end of the upper drive casing and opened at a lower surface for pinching a rib plate of the lower casing, and a sheath pipe provided in a direction perpendicular to the opening direction of the knob member. An inverted L-shaped notch groove formed in the sheath tube, an operating rod inserted into the notch groove and guided by the notch groove, and the sheath tube that biases the operating rod in the direction of the knob member. It consists of a spring installed inside the handle, and a locking rod that slides through the through hole of the knob member and the sheath tube, and when the operation rod is connected, the operating rod is pressed by the upper end of the removable lower casing, opening the notch groove. The top drive is characterized in that, at the same time as the locking part moves from the locking part to the locking part via the notch part, the tip of the locking rod reaches the locking hole opened in the rib plate of the lower casing and the through hole of the knob member and is automatically locked. Automatic locking device between casing and removable lower casing. An automatic locking device for an upper drive casing and a removable lower casing according to claim 1, wherein the locking device is connected to the lower end of the upper drive casing. An automatic locking device for an upper drive casing and a removable lower casing according to claim 1 or 2, wherein a pair of locking devices are provided.