JPS6145107Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a ramp that is linked to the lifting and lowering of a crane cab, and more particularly to a ramp that lowers or rises in conjunction with the lifting and lowering of a cab without using independent power for lifting and lowering. BACKGROUND OF THE INVENTION Cranes with a cab that moves up and down are generally used to safely and accurately perform overhead crane work, monitor work, or save labor. For example, a crane 2 is used for ingot making work in a steel factory by raising and lowering the cab 4 of the crane 2 as shown in FIGS. 1 and 2 and Table 1, depending on the content of the work.

[Table] In the No. 1 and No. 2 processes in Table 1, the operator gets on and off from the driver's cab 4 and the floor (FL), so the lower end of the ramp 6 is located at the lower limit FL.
In process No. 3, both the driver's cab 4 and the ramp 6 are at the upper limit, and the lower end of the ramp 6 must be raised to the same height as the lower end of the driver's cab 4 to avoid obstacles such as the handrail 12. Conventionally, the ramp for the operator of a crane with an elevating cab has been raised and lowered by an independent drive source such as electric power or compressed air, or a mobile or removable ramp has been used, but the former requires high equipment costs. In addition, the operation is complicated and the maintainability of the device is also difficult. In addition, the latter type of movable and removable ramps reduces work efficiency and is unreliable in terms of safety. The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional technology in the crane ramp having an elevating driver's cab, and to provide a ramp that can be raised and lowered in conjunction with the driver's cab without requiring an independent drive source and having an extremely simple configuration. is to provide. The gist of the present invention is as follows.
That is, in a crane having a driver's cab that is movable up and down via an elevator guide frame attached to a crane garter, a movable pulley guide attached to a side surface of the driver's cab elevator guide frame is attached to a ramp that interlocks with the driver's cab. A frame, a movable pulley shaft guide and a support rod guide that are vertically attached to the movable pulley guide frame, and a movable pulley shaft that slides up and down inside the movable pulley shaft guide so that it can be raised and lowered. a movable pulley; a support rod having an upper end fixed to the movable pulley shaft and having a free lower end that slides up and down inside the support rod guide; and a support rod provided on the movable pulley guide frame to limit descent of the movable pulley shaft. a stopper, a sliding post guide that guides a sliding post that is fixed to a side surface of the elevator cab and that fixes the ramp, a ramp sliding post that slides up and down via the sliding post guide; a ladder fixed to the movable post, a wire rope having its lower end fixed to the upper end of the said ramp sliding post and having its upper end fixed to the cab elevating guide frame via the movable pulley, and a wire rope attached to the side of the cab. This is a crane lift-and-lower cab interlocking type ramp, characterized by comprising a support rod receiving frame which is provided horizontally and supports and pushes up the lower end of the support rod when the cab is raised. An embodiment of the present invention will be described with reference to FIGS. 3A, B, C, and D. Figure 3A shows the upper limit position of the driver's cab and the ramp, Figure 3B shows the lower limit of the driver's cab and the ramp, Figure 3C shows the lower limit position of the driver's cab and the ramp, and Figure 3D shows the lower limit position of the driver's cab and the ramp. It is a side view of C. A movable pulley guide frame 16 is provided on the side surface of the driver's cab elevating guide frame 14, and a movable pulley shaft guide 18 is provided in the vertical direction thereof, and a movable pulley shaft 20 slides up and down within the movable pulley shaft guide 18. In this embodiment, two movable pulleys 22 are provided on the movable pulley shaft 20. Further, a support rod 24 is fixed vertically to approximately the center of the movable pulley shaft 20, and the center portion of the support rod 24 slides vertically inside a support rod guide 26 fixed to the movable pulley guide frame 16. The lower end is a free end. In addition, as shown in Figure C, a stopper 28 is provided at the center of the movable pulley shaft guide 18 in the vertical direction.
is provided to limit the descent of the movable pulley shaft 20.
A sliding post guide 30 is provided on the side of the driver's cab 4 to prevent it from shaking, and a sliding post 32 to which the ramp 6 is fixed can slide up and down.
The uppermost stage of the ramp 6 is a flip-up step 6A as shown in Figure C, which makes it easy for the operator to get on and off when the driver's cab 4 is at its lower limit. The lower end of a wire rope 34 is fixed to the upper end of the ramp sliding post 32, and the other end is fixed to the driver's cab elevating guide frame 14 via the movable pulley 22. Support rod support frame 36 on the side of the driver's cab 4
is provided horizontally, and supports the free end of the support rod 24 when the driver's cab 4 rises, acting to push it up. Furthermore, as shown in Figure C, when the ramp 6 is located at the lower limit, the distance H between the upper end of the support rod receiving frame 36 and the free lower end of the support rod 24 is
It is designed to be 1/2 of the total head of. The construction of the mechanism for interlocking the ramp with the elevator cab according to the present invention is as described above, and its operating state will now be described. As shown in FIG. 3C or B, when the cab 4 is lowered to the lower limit or when the cab 4 is raised by H, which is 1/2 of the total lift, the lower end of the ramp 6 is at the floor level. Located on FL. Therefore, as shown in Figure B, the driver's cab 4
When raised by H above FL, the support rod receiving frame 36 and the free lower end of the support rod 24 come into contact. When the driver's cab 4 further rises, the support rod 24 is pushed up by the support rod receiving frame 36, and the movable pulley 22 also moves upward. in this case,
The wire rope 34 whose lower end is fixed to the upper end of the ramp sliding post 32 passes through the movable pulley 22 and its other end is fixed to the driver's cab elevating guide frame 14. The driver's cab 4 is pulled up at twice the speed, and when the driver's cab 4 reaches its upper limit, the ramp 6 and the lower end of the driver's cab 4 become at the same level. When the driver's cab 4 is lowered, the ramp 6 is moved to the third
The state shown in Figure A changes to the state shown in Figure C. In the above embodiment of the present invention, a case has been described in which two movable pulleys 22 are used and the ramp 6 is raised and lowered by two wire ropes 34, but as shown in FIG. 1 in the center
movable pulleys 22 are provided, and one wire rope 34 is provided.
It is also possible to adopt a configuration in which the ramp 6 is raised and lowered by the steps. As is clear from the above embodiments, the following effects can be achieved by the structure and operation of the present invention. (a) Since the ramp according to the present invention is configured to be mechanically interlocked with the driver's cab, an independent drive source for raising and lowering the ramp is not required, and the intended purpose can be achieved with an extremely simple configuration. (b) The ramp according to the present invention is easy to operate and has excellent maintainability, and the position of the ramp according to the lower, middle, and upper limits of the cab can be adapted to the purpose of work. It can be used for work, etc., and can satisfy workability, reliability, and maintainability at the same time. (c) The tarpaulin according to the present invention can be used not only for ingot making work in steel factories. It can be expected to have a wide range of applications for other purposes as well.

[Brief explanation of the drawing]

Figures 1 and 2 show an example in which a conventional crane with an elevating cab is used for pouring molten steel in a steel factory. The side views of FIGS. 3A, B, C, and D show the crane lifting/lowering cab interlocking type ramp according to the present invention, where A is when the cab is at the upper limit, B is when the cab is at the middle height, and C is when the cab is at the middle height. D is a side view of C, and FIG. 4 is a partial front view of another embodiment of the movable pulley according to the present invention. 2... Crane, 4... Cab, 6... Tarap, 14... Cab lifting guide frame, 16...
...Moving pulley guide frame, 18...Moving pulley shaft guide, 20...Moving pulley shaft, 22...Moving pulley, 24...
...Support rod, 26...Support rod guide, 28
...Stopper, 30...Sliding post guide, 3
2...Sliding post, 34...Wire rope, 36
...Support rod holder frame.

Claims (1)

[Scope of utility model registration request] A movable pulley guide frame attached to a side surface of the driver's cab elevating guide frame and a movable pulley guide frame attached to a side surface of the operator's cab elevating guide frame in a crane having a driver's cab that is provided so as to be movable up and down via an elevating guide frame attached to a crane garter. , a movable pulley shaft guide and a support rod guide that are vertically attached to the movable pulley guide frame, and a movable pulley that is movable up and down via a movable pulley shaft that slides up and down inside the movable pulley shaft guide. a support rod having an upper end fixed to the movable pulley shaft and having a free lower end that slides up and down inside the support rod guide; and a stopper provided on the movable pulley shaft guide to limit the descent of the movable pulley shaft. , a sliding post guide that guides a sliding post that is fixed to a side surface of the elevator cab and that fixes the ramp; a ramp sliding post that slides up and down via the sliding post guide; and the sliding post. a wire rope having its lower end fixed to the upper end of the said ramp sliding post and having its upper end fixed to the cab elevating guide frame via the movable pulley; and a wire rope extending horizontally to the side of the cab. A crane lift-and-lower cab interlocking type ramp comprising: a support rod receiving frame that supports and pushes up the lower end of the support rod when the cab is raised.