Patent Grant
9771247
The present disclosure mainly relates to the field of construction machinery, and more particularly to a cylinder-driven lifting mechanism of a compaction machine and a compaction machine containing the cylinder-driven lifting mechanism of the compaction machine.
A compaction machine is a kind of construction machinery used to impact and compact construction materials or foundations. The compaction machine is widely used in construction operations of industrial and civil buildings, warehouses, yards, docks, airports, foundations of roads and railways, artificial islands, and so on. A lifting mechanism is an important component of a compaction machine. After the lifting mechanism lifts a compaction hammer of the compaction machine to certain height, and releases the compaction hammer to let the compaction hammer fall freely. The free fall of the compaction hammer (a) applies a strong impact force and vibrations to a soil or other construction material surface or a foundation, (b) compacts the soil or other construction materials, (c) decreases compressibility of the soil or other construction materials, (d) improves evenness of the surface of the soil or other construction materials, and (e) reduces future differential settlement.
The lifting mechanism of a compaction machine is generally a winch-type lifting mechanism. The winch-type lifting mechanism includes structures such as a motor (an electric motor or a hydraulic motor), a speed reducer, a clutch, a spool, and a brake. The winch-type lifting mechanism needs to have high braking capacity, and has strict requirements on the clutch regarding shock resistance, friction, and resistance to high temperatures. These requirements greatly increase production and manufacturing costs. Further, the control system of the winch-type lifting mechanism is very complicated, and very difficult to manufacture and maintain, and very difficult for operators to adjust and maintain on a daily basis. As the compaction machine is increasingly frequently used, a ramming process of the compaction hammer frequently impacts the winch-type lifting mechanism. These impacts will likely cause it to fail, cause severe damages to the components, such as the motor, the clutch, and the brake due to fatigue, and increase the maintenance costs of the compaction machine.
Additionally, the compaction machine works in a special environment. During ramming of the compaction hammer, the spool rotates at a high speed of 10 r/s. When a steel wire rope is released from the spool, a certain inclination angle may be formed between the steel wire rope and the axis of the spool. It may cause the spool to shake. In certain extreme cases, such shake may cause internal oil leakage, and reduce reliability and safety during use.
As the compaction machine is increasingly required on construction sites, requirements on performance of the compaction machine become higher and stricter. In view of the defects of existing winch-type lifting mechanism having high production, manufacturing, and maintenance costs, it is desirable to have a lifting mechanism of a compaction machine with low production, manufacturing, and maintenance costs, high reliability, and small in size, to meet increasing demands for the compaction machine from users.
Therefore, heretofore unaddressed needs exist in the art to address the aforementioned deficiencies and inadequacies.
In one aspect, the present disclosure relates to a cylinder-driven lifting mechanism of a compaction machine. In certain embodiments, the cylinder-driven lifting mechanism of the compaction machine includes: (a) a cylinder, (b) a fixed pulley set, (c) a movable pulley set, and (d) a rope. The cylinder has a first end and a second end. The first end of the cylinder is connected to a vehicle body of the compaction machine, and the second end of the cylinder is connected to the movable pulley set. The rope has a head end, and a tail end. The tail end of the rope is connected a compaction hammer. The rope is wound on the fixed pulley set and the movable pulley set and is then connected to the compaction hammer. The cylinder is configured to perform extension and retraction movements. When the cylinder performs extension and retraction movements, the movable pulley set moves with the cylinder. The distance between the movable pulley set and the fixed pulley set increases or decreases accordingly, and then, the compaction hammer connected to the tail end of the rope is lifted up or dropped respectively.
In certain embodiments, the lifting mechanism of the compaction machine may further include a jib head guide pulley. The jib head guide pulley is positioned on a jib of the compaction machine. The rope is wound upwards on the jib head guide pulley, and then turned downwards to connect to the compaction hammer.
In one embodiment, the number of fixed pulleys of the fixed pulley set and the number of movable pulleys of the movable pulley set may be both X. Here X is an integer greater than 1. The head end of the rope is fixedly disposed, and the rope is wound on the fixed pulleys and the movable pulleys alternately, and then turned upwards to go through the jib head guide pulley after being wound on the last movable pulley. In another embodiment, the number of fixed pulleys of the fixed pulley set may be Y, and the number of movable pulleys of the movable pulley set may be Y+1. Here Y is an integer greater than 1. The head end of the rope is fixedly disposed, and the rope is wound on the first movable pulley, is then wound on the fixed pulleys and movable pulleys alternately, and turned upwards to go through the jib head guide pulley after being wound on the last movable pulley.
In certain embodiments, the movable pulleys of the movable pulley set may be all positioned on a mounting shaft, and rotate about an axis of the mounting shaft. The mounting shaft is mounted on a mounting support frame. The second end of the cylinder is connected to the mounting support frame.
In one embodiment, the jib of the compaction machine may be a box-like structure. In another embodiment, the jib of the compaction machine may be a truss structure. The first end of the cylinder is positioned on the jib, and the cylinder is positioned to be in parallel with the jib. A support is mounted on the jib, and the fixed pulley set is mounted on the support.
In certain embodiments, the lifting mechanism of the compaction machine may further include a spool. The spool is rotatably mounted on the vehicle body. The head end of the rope is fixed on the spool. A part of the rope is retractably wound on the spool.
In certain embodiments, the lifting mechanism of the compaction machine may further include 2 spools. In one embodiment, there is only one rope for a single-rope releasing state. The head end of the rope is connected to one of the 2 spools, and the tail end of the rope is connected to the compaction hammer. In another embodiment, there are two ropes for a dual-rope releasing state. The head ends of the two ropes are each connected to one spool, and the tail ends of the two ropes are both connected to the compaction hammer. In certain embodiments, the movable pulley set is connected to only one cylinder.
In one embodiment, the lifting mechanism of the compaction machine may have a first oil-adding passage. The first oil-adding passage is positioned outside of a cylinder barrel of the cylinder. The first oil-adding passage is connected to a rodless chamber and a rod chamber of the cylinder. In a first state, when a piston rod of the cylinder extends, hydraulic oil enters from the rod chamber through the first oil-adding passage into the rodless chamber, and the compaction hammer is dropped. In a second state, when the piston rod of the cylinder retracts, the first oil-adding passage is closed, and the compaction hammer is lifted up. In certain embodiments, the first oil-adding passage may have a first hydraulically controlled cartridge valve. The first hydraulically controlled cartridge valve includes: (a) a first port connected to the rodless chamber, (b) a second port connected to the rod chamber, and (c) a control port connected to a first control oil passage. The first control oil passage releases pressurized oil in the first state and the pressurized oil is pumped into the first control oil passage in the second state. In certain embodiments, the lifting mechanism of the compaction machine may include multiple first oil-adding passages. These first oil-adding passages are mounted in parallel on an outer wall of the cylinder, and configured to connect the rodless chamber and the rod chamber.
In certain embodiments, the lifting mechanism of the compaction machine may further include a second oil-adding passage. The second oil-adding passage is positioned in a piston of the cylinder. The second oil-adding passage connects to a rodless chamber at one end of the piston and a rod chamber at the other end of the piston. In a first state, when the piston rod of the cylinder extends, hydraulic oil enters from the rod chamber through the second oil-adding passage into the rodless chamber such that the compaction hammer is dropped. In a second state, when the piston rod of the cylinder retracts, the second oil-adding passage is closed, and the compaction hammer is lifted up.
In certain embodiments, the second oil-adding passage may have a second hydraulically controlled cartridge valve. The second hydraulically controlled cartridge valve has (a) a first port connected to the rodless chamber, (b) a second port connected to the rod chamber, and (c) a control port connected to a second control oil passage. The second control oil passage is positioned in the piston rod. In the first state, the second control oil passage releases pressurized oil, and in the second state, pressurized oil is pumped into the second control oil passage. In certain embodiments, a first oil input passage may be further placed in the piston rod of the cylinder. The first oil input passage is in communication with an oil passage between the second port of the second hydraulically controlled cartridge valve and the rod chamber. The outer wall of the cylinder barrel of the cylinder includes an oil input/output port of the rodless chamber.
In certain embodiments, the second oil-adding passage may have a hydraulically controlled check valve. The hydraulically controlled check valve has (a) a first oil port connected to the rod chamber, (b) a second oil port connected to the rodless chamber, and (c) a control port connected to a third control oil passage positioned in the piston rod. In the first state, pressurized oil is pumped into the third control oil passage, and in the second state, the third control oil passage releases pressurized oil. In certain embodiments, the piston rod of the cylinder may further include a second oil input passage. The second oil input passage is in communication with an oil passage between the first oil port of the hydraulically controlled check valve and the rod chamber. The third control oil passage is further in communication with the rodless chamber.
In another aspect, the present disclosure relates to a compaction machine. The compaction machine has the cylinder driven lifting mechanism of the compaction machine described above.
These and other aspects of the present disclosure will become apparent from the following description of the preferred embodiment taken in conjunction with the following drawings, although variations and modifications therein may be effected without departing from the spirit and scope of the novel concepts of the invention.
The accompanying drawings illustrate one or more embodiments of the invention and, together with the written description, serve to explain the principles of the invention. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment. The drawings do not limit the present disclosure to the specific embodiments disclosed and described herein. The drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the invention, and wherein:
The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.
It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” or “has” and/or “having” when used herein, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.
Furthermore, relative terms, such as “lower” or “bottom”, “upper” or “top,” and “front” or “back” may be used herein to describe one element's relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower”, can therefore, encompasses both an orientation of “lower” and “upper,” depending of the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The exemplary terms “below” or “beneath” can, therefore, encompass both an orientation of above and below.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, “around”, “about” or “approximately” shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term “around”, “about” or “approximately” can be inferred if not expressly stated.
The description will be made as to the embodiments of the present disclosure in conjunction with the accompanying drawings. In accordance with the purposes of this invention, as embodied and broadly described herein, this invention, in one aspect, relates to a lifting mechanism of a compaction machine, and a compaction machine having the lifting mechanism of the compaction machine.
In one embodiment, a cylinder-driven lifting mechanism of the compaction machine is disclosed, and the cylinder-driven lifting mechanism of the compaction machine includes: (a) a cylinder, (b) a fixed pulley set, (c) a movable pulley set, and (d) a rope. The cylinder has a first end and a second end. The first end of the cylinder is connected to a vehicle body of the compaction machine, and the second end of the cylinder is connected to the movable pulley set. The rope has a head end, and a tail end. The tail end of the rope is connected a compaction hammer. The rope is wound on the fixed pulley set and the movable pulley set and is then connected to the compaction hammer. The cylinder is configured to perform extension and retraction movements. When the cylinder performs extension and retraction movements, the movable pulley set moves with the cylinder. The distance between the movable pulley set and the fixed pulley set increases or decreases accordingly, and then, the compaction hammer connected to the tail end of the rope is lifted up or dropped respectively.
Referring now to
In one embodiment, the first end of the cylinder 1 may be connected to a platform of the compaction machine. In another embodiment, and the first end of the cylinder 1 may be connected to a jib 7 of the compaction machine (as shown in
In one embodiment, the second end of the cylinder 1 is connected to the movable pulley set 3. When the piston rod of the cylinder 1 extends or retracts, the movable pulley set 3 is driven by the piston rod of the cylinder 1, and moves with the piston rod of the cylinder 1. In a position shown in
In certain embodiments, the falling distance of the compaction hammer G generally ranges from 8 m to 25 m, and sometime reaches up to 40 m. Usually, the stroke distance of the piston rod of the cylinder 1 limits the falling distance of the compaction hammer G. In certain embodiments, the fixed pulley set 2 and the movable pulley set 3 are used here to multiply the stroke distance of the piston rod of the cylinder 1 so that the stroke of the piston rod of the cylinder 1 matches the falling distance of the compaction hammer G. When different configurations of the fixed and movable pulley sets are adopted, the stroke distance of the piston rod of the cylinder 1 are multiplied to yield greater falling distance of the compaction hammer G.
Referring now to
In one embodiment, the rope 5 has its head end fixed. The rope 5 is wound on and turned on the fixed pulley set 2, the movable pulley set 3, and the jib head guide pulley 4, and has the tail end connected to the compaction hammer G. The rope 5 is wound on the fixed pulley set 2 and the movable pulley set 3, and is then preferably wound upwards on the jib head guide pulley 4, and turned to be connected downwards to the compaction hammer G. The foregoing “upwards” and “downwards” may be “vertically upwards” and “vertically downwards”, and may also refer to a direction inclined by a certain angle from the vertical direction. In one embodiment, the rope 5 is a steel wire rope. In another embodiment, the rope 5 is an iron chain. In yet another embodiment, the rope 5 is a rope made of other flexible and strong materials.
In one embodiment, the fixed pulley set 2 may include one or more fixed pulleys, and similarly, the movable pulley set 3 may also include one or more movable pulleys. In order to increase the multiplication factor, the fixed pulley set 2 preferably includes multiple fixed pulleys, and the number of the movable pulleys of the movable pulley set 3 matches the number of the fixed pulleys. If the number of the fixed pulleys movable of the fixed pulley set 2 and the number of movable pulleys of the movable pulley set 3 are set as N, where N is an integer greater than 1, then the falling distance of the compaction hammer G is N times of the stroke distance of the piston rod of the cylinder 1.
In one embodiment, the number of the fixed pulleys and the number of the movable pulleys are both X, where X is an integer greater than 1. X is preferably 2, 3, or 4. The head end of the rope 5 is fixedly disposed, and the rope 5 is wound on the fixed pulleys and the movable pulleys alternately, and after being wound on the last movable pulley, is turned upwards to be wound on the jib head guide pulley 4. In the embodiment shown in
Referring now to
When the compaction hammer G is moved up and down, each fixed pulley and movable pulley rotates accordingly, and the movable pulley set 3 travels with the movement of the piston rod of the cylinder 1. The movable pulley set 3 and the cylinder 1 may be connected by using different kinds of connecting components. In one embodiment, the movable pulleys may be mounted individually. In another embodiment, the movable pulleys may be mounted together in a movable pulley shaft. In one embodiment shown in
In one embodiment, the piston rod of the cylinder 1 pushes and pulls the mounting support frame 62, and the movable pulley set 3 moves as a whole to change the distance between the movable pulley set 3 and the fixed pulley set 2 to move the compaction hammer G up or down. During the compaction hammer G movement, the travel direction of the rope 5 is predetermined to avoid shaking of the spool, reduce the damage to the components during the operation, and increase the reliability of the compaction machine.
In one embodiment, the jib 7 of the compaction machine has a truss structure (as shown in
In certain embodiments, the first end of the cylinder 1 is preferably disposed on the jib 7, and the cylinder 1 is disposed in parallel with the jib 7 to optimize the spatial layout and make the aesthetics of the overall appearance desirable. Further, a support 71 may further be mounted on the jib 7, and the fixed pulley set 2 is mounted on the support 71. Specific mounting manners of the components are not intended to limit the present disclosure.
In certain embodiments, the cylinder 1 may be placed on a vertically middle position of the jib 7. After the rope 5 is turned by the fixed pulley set 2 and the movable pulley set 3, releasing direction of the rope 5 is deviated from the middle position. Such deviation may be adjusted by changing the direction of the pulley to reduce a bias load and balance the force borne by the compaction machine.
In certain embodiments, the tail end of the rope 5 is connected to the compaction hammer G. The part of the rope 5, connected to the compaction hammer G, may likely be worn. If the length of the rope 5 is not adjustable, and when the tail end of the rope 5 is worn and fail, the entire rope may have to be replaced, which increases the use cost.
Referring now to
In certain embodiments, during transportation of the compaction machine, the jib system of the compaction machine needs to be dismantled and transported separately. The rope 5 may be retracted into the spool 90 during the transportation. The spool 90 makes the retraction of the rope 5 very easy and convenient, and has desirable aesthetic arrangement.
In one embodiment, a single-rope releasing state of the lifting mechanism of the compaction machine is shown in
In the embodiment of the single-rope releasing state shown in
In the embodiment of the dual-rope releasing state shown in
In certain embodiment, the speed of the falling compaction hammer G is very high in the compaction operation. For example, if the compaction hammer G falls freely from the height of 20 m, the speed of the compaction hammer G can be as high as 18 meters/second when the compaction hammer G touches the ground, even if the factor of energy loss is taken into consideration. This fast compaction hammer travelling speed requires that the piston rod of the cylinder 1 to move quickly, and especially when the piston rod extends. Although the retraction speed of the piston rod of the cylinder 1 can be slow, but the extension speed has to be very high.
Referring now to
In the embodiment shown in
The cylinder 1 has a piston 10 and a piston rod 11. The piston 10 divides the cylinder 1 into two chambers: a rodless chamber 1A and a rod chamber 1B. The chamber at the end of the piston 10 where piston rod connects to the piston 10 is referred as rod chamber 1B. The chamber at the opposite end of the piston 10 where piston rod connects to the piston 10 is referred as rodless chamber 1A. The first oil-adding passage L1 and the second oil-adding passage L2 are both connected to the rodless chamber 1A and the rod chamber 1B of the cylinder 1. Each of the first and second oil-adding passages is in either an opened state or a closed state. When each of the oil-adding passages is opened, the pressures at both ends of the piston 10 are equal. Since the pressure receiving area of an end surface of the piston 10 of the rodless chamber 1A is greater than that of the rod chamber 1B, the total pressures at the two ends of the piston 10 are different, and the piston 10 moves towards the rod chamber 1B, hydraulic oil in the rod chamber 1B enters the rodless chamber 1A through the oil-adding passage to increase the flow in the rodless chamber 1A to allow piston rod 11 to extend quickly.
In certain embodiments as shown in
The volume of the rodless chamber 1A is greater than the volume of the rod chamber 1A, so that oil needs to be further input through an oil input/output port C1 of the rodless chamber 1A to compensate for the hydraulic oil of the volume occupied by the piston rod 11. In this case, the flow of the oil input into the rodless chamber 1A is large, and the extension speed of the cylinder 1 is high.
When the piston rod 11 of the cylinder 1 retracts (in a second state), the first oil-adding passage L1 is closed, and the compaction hammer G is lifted up. In the second state, the first oil-adding passage L1 does not interfere with hydraulic oil exchange between the rod chamber 1B and the rodless chamber 1A. The hydraulic oil returns through the oil input/output port C1 of the rodless chamber 1A, and enters through an oil input/output port C2 of the rod chamber 1B. In this state, the compaction hammer G is lifted up, and there is no requirement for an increased speed of the movement of the piston rod 11 of the cylinder 1.
In certain embodiments, a first hydraulically controlled cartridge valve 81 may be provided to the first oil-adding passage L1. The first hydraulically controlled cartridge valve 81 includes a first port A, a second port B, a control port, and a path for a large hydraulic oil flow. In certain embodiments, the hydraulic oil flow can reach 3000 L/m. The first port A of the first hydraulically controlled cartridge valve 81 is connected to the rodless chamber 1A. The second port B of the first hydraulically controlled cartridge valve 81 is connected to the rod chamber 1B. The control port is connected to a first control oil passage K1. In the first state, the first control oil passage K1 releases the pressure. In the second state, pressure oil is pumped into the first control oil passage K1. Pressure releasing and oil entering states of the first control oil passage K1 may be achieved through a two-position-three-way reversing valve, and may also be achieved through other possible oil passage designs.
In certain embodiments, the lifting mechanism of the compaction machine has more than one first oil-adding passages L1. These first oil-adding passages L1 are disposed in parallel on an outer wall of the cylinder 1. The rodless chamber 1A and the rod chamber 1B are connected by these first oil-adding passages L1. Through combination of the flows of the multiple first oil-adding passages L1, the flow of the oil input into the rodless chamber 1A may reach 10000 L/m or more to ensure rapid extension of the piston rod 11, meeting requirement for a quick release of the compaction hammer G.
In the embodiments of the present disclosure shown in
In certain embodiments as shown in
In certain embodiments, the piston rod 11 may further be provided with an oil passage to supply oil to the rod chamber 1B to optimize oil lines. Preferably, a first oil input passage P1 is further disposed in the piston rod 11 of the cylinder 1. The first oil input passage P1 is in communication with the oil passage between the second port B of the second hydraulically controlled cartridge valve 82 and the rod chamber 1B. The outer wall of the cylinder barrel of the cylinder 1 is further provided with the oil input/output port C1 of the rodless chamber 1A.
In the first state of the embodiment shown in
In the second state of the embodiment shown in
In the embodiments shown in
In certain embodiments, the piston rod 11 may have an oil passage to supply oil to the rod chamber 1B to optimize oil lines. Preferably, the piston rod 11 of the cylinder 1 is further provided with a second oil input passage P2. The second oil input passage P2 is in communication with the oil passage between the first oil port C of the hydraulically controlled check valve 9 and the rod chamber 1B, and the third control oil passage K3 is further in communication with the rodless chamber 1A.
In the first state of the embodiment shown in
In the second state of the embodiment shown in
In certain embodiments, the present disclosure relates to a compaction machine that has the lifting mechanism of the compaction machine described above. Certain embodiments of the compaction machines are shown in
In summary, the lifting mechanism of the compaction machine according to the present disclosure is significantly different from a conventional winch-type drive mechanism. It takes the advantage of the features: (a) a cylinder has a large driving force, and (b) the piston rod travelling distance can be multiplied by using the combination of a movable pulley set and a fixed pulley set. Additional advantages of the present disclosure include:
Therefore, the beneficial effects of the present disclosure are obvious.
The foregoing description of the exemplary embodiments of the invention has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching.
The embodiments were chosen and described in order to explain the principles of the invention and their practical application so as to activate others skilled in the art to utilize the invention and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope. Accordingly, the scope of the present disclosure is defined by the appended claims, the foregoing description and the exemplary embodiments described therein, and accompanying drawings.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012 1 04787233 | Nov 2012 | CN | national |
This application is a continuation application of International Application No. PCT/CN2013/087034, filed on Nov. 13, 2013, entitled “CYLINDER-DRIVEN LIFTING MECHANISM OF COMPACTION MACHINE AND COMPACTION MACHINE”, by Xiaogang Y I, Zuoliang ZHANG, Dong L I, and Zhekui QUAN, which itself claims priority of Chinese Patent Application No. 201210478723.3, filed with the Chinese Patent Office on Nov. 22, 2012, entitled “CYLINDER-DRIVEN LIFTING MECHANISM OF COMPACTION MACHINE AND COMPACTION MACHINE”, by Xiaogang Y I, Zuoliang ZHANG, Dong L I, and Zhekui QUAN, the disclosures of which are incorporated herein in their entireties by reference.
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| 3534867 | Ghysels | Oct 1970 | A |
| 3591022 | Polyakov | Jul 1971 | A |
| 4168053 | Boenninghaus | Sep 1979 | A |
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| Number | Date | Country | |
|---|---|---|---|
| 20140246635 A1 | Sep 2014 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2013/087034 | Nov 2013 | US |
| Child | 14277244 | US |
