WO2006033504A1

WO2006033504A1 - Hydraulic hitting type jackhammer with auto lubricant feeder and pneumatic pressure supply

Info

Publication number: WO2006033504A1
Application number: PCT/KR2004/003419
Authority: WO
Inventors: Boong-Gu Cho; Young-Jun Kim
Original assignee: Komac Co., Ltd.
Priority date: 2004-09-21
Filing date: 2004-12-23
Publication date: 2006-03-30
Also published as: KR200369452Y1

Abstract

Disclosed herein is a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which the piston is lifted by the hydraulic pressure, strikes the chisel formed at the lower portion by the power of the compressed gas to thereby break the objects to be broken, the lubricant feeder to supply the lubricant automatically from the upper portion to the supporting portion is formed in order to minimize the abrasion by friction of the supporting portions supporting the chisel which is struck by the high speed and pressure dropping, thereby maximizing the lifespan of the jackhammer.

Description

Description Hydraulic Hitting type jackhammer with Auto Lubricant feeder and pneumatic pressure supply

Technical Field

[ 1 ] The present invention relates to a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, more specifically, to such a jackhammer, in which it can be installed in construction equipment such as an excavator, lubricant is supplied automatically to a chisel through the top of an external housing of a jackhammer connected thereto, pneumatic pressure is connected from the top of the housing to the bottom of the piston so that air is injected continuously to remove dust in-flowing into the piston, and also in a bad condition such as a rainy day or underwater operation, prevent the water from reverse-flowing into the piston, while feeding lubricant from the upper side automatically and continuously, thereby improving the operational efficiency economically, increasing versatility, and extending the lifespan thereof by protecting the parts thereof from water and dust.

Background Art

[2] In general, a hydraulic jackhammer, which is widely used as a breaking device at a construction or civil works sites, is mounted on the front side of a construction equipment and breaks a base rock, a concrete structure, and an asphalt pavement using a hydraulic pressure source of the construction equipment. The use places thereof have become various and thus the need therefor has been increased.

[3] As depicted in FTG. 1, a conventional hydraulic jackhammer is configured to be attached to construction equipment such as an excavator in order to break a base rock 4. The jackhammer includes a cylinder 1 having a chisel 3 for breaking the base rock 4 by reciprocating upwardly and downwardly. While controlling pressure with a hydraulic pressure valve 16, hydraulic oil in construction equipment is fed to the upper hydraulic pressure chamber 6 and the lower hydraulic pressure chamber 7 of the piston 2, which is in the middle of the body of the cylinder 1. The piston is lifted and strikes the chisel 3 formed at the lower portion by the power of compressed gas at the peak pressure of the compressed-gas chamber 5 filled with nitrogen.

[4] The conventional jackhammer having the above construction connects the top of the cylinder 1 to the construction equipment such as an excavator, and then is transferred to the location of the object to be broken. If hydraulic pressure of the hydraulic pressure source is fed to the hydraulic pressure valve 16, and hydraulic oil is supplied to the upper hydraulic pressure chamber 6 and lower hydraulic pressure chamber 7 while properly controlling hydraulic oil according to the pressure, and then the piston 2 located in the middle is lifted.

[5] In this way, if the piston 2 is lifted, the nitrogen gas in the compressed-gas chamber 5 at the upper portion is compressed to decrease its volume and provide the striking force to the piston 2 by the increased pressure, and strike the chisel 3 at the lower portion, which in turn breaks an object to be broken.

[6] The above conventional jackhammer embraces several problems as follows: As the piston 2 moves at a high speed with striking force to strike the chisel 3, the abrasion by friction of the supporting portions increases, the location of the supporting portions and the striking point of the piston 2 is changed, thus the impact is not concentrated on the chisel 3 when striking the chisel, the other parts being struck results in significant damage , and the kinetic energy of the piston 2 is converted to transformation energy of the internal parts of jackhammer, heat, noise, and vibration, leading to significant damage and the reduced lifespan.

[7] In addition, because the operators themselves feed the lubricant manually to the supporting portions of the chisel 3 to prevent the abrasion and carry out the breaking operation, the lubricating performance is not displayed properly, the abrasion of the supporting portions goes worse, and the striking force of the piston 2 is transferred to the other parts. Therefore, the life of the jackhammer is shortened.

[8] When breaking rock or concrete structures by attaching a jackhammer, the internal pressure of the device decreases by the lift of the piston 2, and thus dust and debris of the object to be crushed is suctioned into the jackhammer, thereby leading to the failure of the jackhammer and reduction of its life.

[9] In addition, depending on the operating condition, while operating in water such as a rainy day or underwater operation to break rock and concrete structures, the pressure difference is caused by the lifting of the piston 2, and thus water flows reverse into the hydraulic pressure parts and the compressed-gas chamber 5 of the jackhammer and is mixed with lubricant, which is fed when the piston 2 moves. There arises a problem that the piston is corroded and the lubricating performance is noticeably degraded , which causes the failure of the jackhammer or shortens the life thereof.

[10] Furthermore, a jackhammer has problems that a noise pollution is caused owing to the severe noise and vibration of the piston vertically reciprocating and striking the chisel 3 inside the cylinder 1, and a deformation phenomenon of the external housing due to the vibration results in frequent replacement. Disclosure

[11] The present invention has been made to solve the above problems in the art, and it is an object of the invention to provide a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which the piston is lifted by the hydraulic pressure, strikes the chisel formed at the lower portion by the power of the compressed gas to thereby break the objects to be broken, the lubricant feeder to supply the lubricant automatically from the upper portion to the supporting portion is formed in order to minimize the abrasion by friction of the supporting portions supporting the chisel which is struck by the high speed and pressure dropping, thereby maximizing the lifespan of the jackhammer.

[12] Another object of the invention is to provide a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which the lubricant is supplied automatically to the upper portion of the main body through the lubricant feed passageway, and the lubricant can be supplied manually through the manual supply port when the automatic supply fails, so that the abrasion of the supporting portions against the upward-and-downward operation of the piston is minimized, thereby extending the lifespan, and the process of automatic lubricant supply is simplified thereby improving the productivity.

[13] A further object of the invention is to provide a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which a shielding cover is formed at the chisel supporting portion of the lower portion of the main body in order to prevent dust and debris of the object to be broken from being suctioned, which is caused by a decrease in the internal pressure of the hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply when in the lift of the piston while breaking a rock or a concrete structure, so that the breakdown by the introduced dust and debris can be prevented, thereby extending the life of the jackhammer.

[14] A further object of the invention is to provide a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which the pneumatic pressure supply for supplying pneumatic pressure is formed towards the inside of the upper portion of the main body in order to prevent the water from flowing reverse caused by a pressure difference when the piston ascends, such that the pressured air is injected continuously in a form of a shielding curtain such as an air-curtain, thereby minimizing the loss of the part caused by the moisture, shortening the period of operation even in a bad condition such as a rainy day or underwater operation, enlarging the versatility, and improving the operation efficiency.

[15] A further object of the invention is to provide a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which the steady rest is formed at the side of top and down in order to minimize the vibration by suppressing the vibration of the main body, which is formed so as to break an object by operating upwardly and downwardly inside the housing that is connected to a construction equipment like an excavator by the connecting bar formed at the upper portion thereof, and the shielding cover is provided at the lower portion in order to shield the suction of dust from the lower portion, so that the noise is reduced, and the introduction of noise and dust is minimized, thereby extending the lifespan of the jackhammer and preventing the environmental pollution.

[16] A further object of the invention is to provide a hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply, in which the side rein¬ forcement is formed to minimize the deformation phenomenon caused by the vibration when the side of the housing is struck, where the main body of the housing is fixed by the steady rest and is connected to construction equipment like excavator at the top the housing, and the lower reinforcement is formed in a plate shape at the lower portion, which is made up of abrasion-resistant material resistant to abrasion, so that vibration resulting from striking and abrasion due to vertical reciprocation of the chisel at the upper and lower portion can be minimized, thereby extending the lifespan.

[17] In order to accomplish the above objects, according to the present invention, there is provided a hydraulic hitting type jackhammer having an auto lubricant feeder and a pneumatic pressure supply. The jackhammer of the invention comprises: a housing including a connecting bar on the top thereof for connecting with a construction equipment such as an excavator, a hydraulic-connection port to be connected with hydraulic pressure at the front in the form of bellows, a through-hole type lubricant feed hole at the front of the lower portion thereof for feeding manually the lubricant, and a steady rest formed in plural at the top, bottom, left, and right of the inside thereof for suppressing vibration; a main body fixed inside the housing by the steady rest and formed in such a manner to supply a main hydraulic pressure valve with hydraulic pressure which is introduced from the hydraulic-connection port to the hydraulic pressure supply port formed at the front of the top thereof, the main body having a piston formed at the center for reciprocating upwardly and downwardly by the hydraulic pressure fed through the main hydraulic pressure valve, a compressed-gas chamber formed at the upper portion and filled with gas to be compressed by the piston in order to form the striking force downwardly, a temporary oil storage formed at the front of the center for storing oil temporarily in order to prevent the leakage caused by the change of oil resulting from the rapid drop of the piston, a chisel at the lower portion supported by the chisel pin and the thrust ring at the location struck by the piston and for breaking the object to be broken, a shielding cover provided below the support portion of the chisel for preventing the introduction of foreign matters, and a through-hole type manual supply port formed at the front of the lower portion for supplying lubricant to a side of the thrust ring; and a lubricant feeder including a lubricant supply valve for supplying lubricant from the front of the upper portion of the main body such that the lubricant is automatically supplied through a lubricant feed port to the other side of the thrust ring via a lubricant feed passageway internally, and a lubricant connecting port connected to the outside through the other side of the lubricant feed port for supplying lubricant.

[18] In addition, a side reinforcement is formed and projected at the side of the housing in order to prevent twisting caused by vibration, and a lower reinforcement made of abrasion-resistant material is formed at the bottom of the housing in a plate-shape, thereby minimizing vibration resulting from striking operation and abrasion caused by vertical reciprocation of chisel at the upper and lower portion.

[19] Furthermore, a pneumatic pressure supply valve is formed at the upper portion of the front of the main body for supplying pneumatic pressure, and a pneumatic pressure supply is formed such that a pneumatic pressure supply injects continuously air towards a pneumatic pressure supply port formed at one side of the piston via a pneumatic pressure supply passageway in order to form a shielding air-curtain at the lower portion of the piston, thereby preventing introduction of foreign matters and reverse flow.

Description Of Drawings

[20] Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[21] FIG. 1 illustrates a cross-section of a conventional hydraulic striking jackhammer ;

[22] FIG. 2 is a perspective view of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with one embodiment of the present invention;

[23] FIG. 3 is a partially exploded perspective view showing a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with one embodiment of the present invention;

[24] FIG. 4 is a partially exploded elevational view of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with one embodiment of the present invention;

[25] FTG. 5 is a partially exploded side view of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with an embodiment of the present invention;

[26] FTG. 6 is an elevational view showing a major portion of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with one embodiment of the present invention;

[27] FTG. 7 is a cross-sectional view showing a major portion of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with one embodiment of the present invention; and

[28] FTG. 8 is a cross-sectional view showing the operation of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply in accordance with one embodiment of the present invention.

Best Mode of Invention

[29] Hereafter, the preferred embodiments of the present invention will be explained in detail with reference to the accompanying drawings.

[30] FIG. 2 is a perspective view of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, FIG. 3 is a partially exploded perspective view showing a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, FTG. 4 is a partially exploded elevational view of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, FTG. 5 is a partially exploded side view of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, FIG. 6 is an elevational view showing a major portion of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, FTG. 7 is a cross- sectional view showing a major portion of a hydraulic striking jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, and FTG. 8 is an elevational cross-section showing the operation of a hydraulic striking jackhammer with auto lubricant feeder and pneumatic pressure supply in accordance with an embodiment of the present invention. [31] As shown in FIGS. 2 to 8, the hydraulic hitting type jackhammer 100 with an auto lubricant feeder and pneumatic pressure supply of the invention comprises a housing 110 structured in such a manner that the upper portion thereof can be connected to a construction equipment such as an excavator and various parts can be installed in the inner space thereof, a main body 120 supplying a hydraulic pressure inside of the housing 110 to vertically reciprocate a piston 121 such that it strikes a chisel 126 formed at the lower portion thereof to thereby break an object to be broken, a lubricant feeder 130 for automatically supplying a lubricant to a thrust ring 127 of the chisel 126 through one side of the main body 120, and a pneumatic pressure supply 140 for forming a shielding air-curtain at the lower portion of the piston 121 by injecting the pneumatic pressure continuously through one side of the main body 120.

[32] The housing 110 includes a connecting bar 111 formed at the upper portion thereof for connecting it to the construction equipment such as excavator, a hydraulic- connection port 112 formed at the front side in the form of bellows for connecting the hydraulic pressure, a lubricant feed hole 113 formed at the lower portion of the front side thereof in the form of a through-hole for manually supplying the lubricant manually, and plural steady rests 114 provided at the top, bottom, left, and right of the inside thereof for suppressing vibration.

[33] Here, the housing 110 has a side reinforcement 115 formed at the side thereof for preventing twisting by the vibration, and a lower reinforcement 116 formed in a plate shape at the lower portion and made of an abrasion-resistant material for minimizing vibration resulting from striking operation and abrasion caused by vertical re¬ ciprocation of the chisel 126 at the upper and lower portion.

[34] It is preferable to prevent vibration and introduction of foreign material by forming the hydraulic-connection port 112 in the form of bellows, which connects the housing 110 to a hydraulic pressure transferred from a high or low hydraulic pressure source.

[35] Further, the steady rest 114 for suppressing vibration is made of vibration- absorbing urethane materials and is provided in plural laterally at the upper and lower portions of the main body 120, thereby minimizing the vibration.

[36] The above main body 120 is fixed by the steady rest 114 within the housing 110 and constructed such that the hydraulic pressure introduced from the hydraulic- connection port 112 is connected to the hydraulic pressure supply port 123 formed at the upper front side thereof to thereby supply hydraulic pressure to a main hydraulic pressure valve 122. At the center thereof is provided the piston 121 operating upwardly and downwardly by the power of hydraulic pressure provided from the main hydraulic pressure valve 122. At the upper portion of the main body 120 formed a compressed- gas chamber 124 filled with gas, which is compressed by the piston 121 to generate a striking force. The main body 120 is provided with a temporary oil storage 125 formed at the center of the front thereof for storing oil temporarily in order to prevent the leakage caused by the change of oil resulting from the rapid descending of the piston 121, the chisel 126 supported by a chisel pin 126a and a thrust ring 127 at the location struck by the piston 121 at the lower portion and for breaking the objects to be broken, and a shielding cover 128 formed below the support portion of the chisel 126 for preventing the introduction of foreign matters, and a manual supply port 129 in the form of a through-hole for supplying the lubricant to one side of the thrust ring 127.

[37] Here, the main hydraulic pressure valve 122 is constructed such that the piston 121 can be operated upwardly and downwardly by providing hydraulic pressure to the upper and lower portion thereof .

[38] In addition, the compressed-gas chamber 124 formed at the upper portion of the piston 121 is filled with a compressed gas such as nitrogen so that the piston 121 can be operated upwardly by hydraulic pressure provided by the main hydraulic pressure valve 122 and thus the gas is compressed to thereby form the downward striking force by the compressed gas.

[39] The shielding cover 128 formed at the lower portion of chisel 126 prevents in¬ troduction of foreign matters.

[40] In addition, the manual supply port 129 formed at one side of the thrust ring 127 is preferred to be constructed in such a manner that it is formed in the form of a through- hole opened to the thrust ring 127 of the chisel 126 , thereby enabling a manual supply of lubricant.

[41] The lubricant feeder 130 is provided with a lubricant supply valve 131 formed laterally at the lower portion of the front of the main body 120 and for supplying a lubricant, and the lubricant is automatically supplied internally along a lubricant feed passageway 132 through a lubricant feed port 133 to the other side of a thrust ring 127. A lubricant connecting port 134 is formed such that it is connected to the outside through the other side of the lubricant feeder port 133 in order to supply the lubricant.

[42] The main body 120 is provided with a pneumatic pressure supply valve 141 for supplying pneumatic pressure to the front side of the upper portion thereof. The pneumatic pressure supply 140 is constructed so as to inject pneumatic pressure via pneumatic pressure supply passageway 142 to the pneumatic pressure supply port 143 formed at one side of the piston 121. The pneumatic pressure supply 140 injects air continuously in such a manner that a shielding air-curtain is formed at the lower portion of the piston 121, thereby preventing the introduction of foreign matters and a reverse flow.

[43] The operation of the hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply having the above-described construction will be explained below.

[44] First, after connecting the connecting bar 111 of the housing 110 to a construction equipment such as an excavator, the chisel 126 formed at the lower portion thereof is transferred to the location of the object to be broken and positioned at the breaking position.

[45] After the chisel 126 is moved, hydraulic pressure provided by the oil source connected to the hydraulic-connection port 112 is supplied to the main hydraulic pressure valve 122 from the hydraulic pressure supply port 123. The hydraulic- connection port 112 generally is provided in the form of bellows in order to prevent a vibration and an introduction of foreign materials. The hydraulic pressure provided by the main hydraulic pressure valve 122 is supplied to the lower portion of the piston 121 so as to lift the piston.

[46] As described above, if the piston 121 ascends, the volume of the gas filled in the compressed-gas chamber 124 provided at the upper portion shrinks and is compressed. When the compressed gas reaches the critical point, the piston descends with a strong striking force and strikes the chisel 126 at the lower portion thereof.

[47] When the piston 121 ascends, the external air is suctioned inside due to the pressure difference with the surrounding atmosphere. Depending on the external operating condition , in order to prevent the moisture while operating in a bad condition such as a rainy day or an underwater operation, the pneumatic pressure supply port 143 injects the pneumatic pressure continuously to one side of the lower portion of the piston 121 to form a shielding air-curtain to thereby prevent effectively the introduction of the water and other foreign matters. The pneumatic pressure supply port 143 is connected to the pneumatic pressure supply valve 141 of the pneumatic pressure supply 140 via the pneumatic pressure supply passageway 142.

[48] Further, the expansion of gas in the compressed-gas chamber 124 descends the piston 121 to strike the chisel 126. Then, the temporary oil storage 125 stores oil temporarily in order to prevent the leakage of the used oil when the piston ascends after the rapid drop.

[49] In this way, if the chisel 126 is struck by the striking force produced by the piston 121 in the compressed-gas chamber 124, the object is broken by the striking energy transferred from the chisel 126, which is supported by the chisel pin 126a and the thrust ring 127.

[50] Here, the lubricant feeder 130 supplies lubricant to the one side of the thrust ring

127 supporting the chisel 126. The lubricant feed port 133 is connected to the lubricant supply valve 131 of lubricant feeder 130 via the lubricant feed passageway 132. Lubricant is supplied automatically and continuously to minimize the friction of the thrust ring 127, simultaneously while breaking the objects to be broken.

[51] In case where the lubricant feeder 130 is inoperable due to a failure, the operation of the jackhammer can be continued by feeding lubricant through the manual supply port 129 formed in the form of a through-hole at the other side of the thrust ring 127.

[52] When the chisel 126 strikes the object to be broken by the operation of the piston

121, the main body 120 having the piston 121 and the chisel 126 is fixed to the housing 110 by the steady rest 114 made of urethane material disposed at the top, bottom, left, and right, thereby extending the life by absorbing vibration and ef¬ fectively reducing noise caused by vibration.

[53] In addition, when breaking the object by reciprocating vertically the piston 121, the chisel 126 operates vertically at the shielding cover 128, which is formed at the lower portion of the supporting portions of the chisel 126, to thereby prevent foreign material from being suctioned and to shield noise effectively.

[54] Furthermore, the side reinforcement 115 for preventing twisting caused by vibration is formed at the side of the housing 110, and the lower reinforcement 116 made of abrasion-resistant material is provided at the bottom of the housing 110 in a plate shape. Therefore, the vibration resulting from the striking operation and the abrasion caused by vertical reciprocation of the upper and lower chisels 126 can be minimized.

Industrial Applicability

[55] As described above, in the hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply according to the present invention, in which the piston is lifted by the hydraulic pressure, strikes the chisel formed at the lower portion by the power of the compressed gas to thereby break the objects to be broken, the lubricant feeder to supply the lubricant automatically from the upper portion to the supporting portion is formed in order to minimize the abrasion by friction of the supporting portions supporting the chisel which is struck by the high speed and pressure dropping, thereby maximizing the lifespan of the jackhammer. [56] In addition, the lubricant is supplied automatically to the upper portion of the main body through the lubricant feed passageway, and the lubricant can be supplied manually through the manual supply port when the automatic supply fails, so that the abrasion of the supporting portions against the upward-and-downward operation of the piston is minimized, thereby extending the lifespan, and the process of automatic lubricant supply is simplified thereby improving the productivity.

[57] Also, a shielding cover is formed at the chisel supporting portion of the lower portion of the main body in order to prevent dust and debris of the object to be crushed from being suctioned, which is caused by a decrease in the internal pressure of the hydraulic hitting type jackhammer with an auto lubricant feeder and a pneumatic pressure supply when in the lift of the piston while breaking a rock or a concrete structure, so that the breakdown by the introduced dust and debris can be prevented, thereby extending the life of the jackhammer.

[58] Furthermore, the pneumatic pressure supply for supplying pneumatic pressure is formed towards the inside of the upper portion of the main body in order to prevent the water from flowing reverse caused by a pressure difference when the piston ascends, such that the pressured air is injected continuously to a shielding curtain such as an air- curtain, thereby minimizng the loss of the part caused by the moisture, shortening the period of operation even in a bad condition such as a rainy day or underwater operation, enlarging the versatility, and improving the operation efficiency.

[59] Also, the steady rest is formed at the side of top and down in order to minimize the vibration by suppressing the vibration of the main body, which is formed so as to break an object by operating upwardly and downwardly inside the housing that is connected to a construction equipment like an excavator by the connecting bar formed at the upper portion thereof, and the shielding cover is provided at the lower portion in order to shield the suction of dust from the lower portion, so that the noise is reduced, and the introduction of noise and dust is minimized, thereby extending the lifespan of the jackhammer and preventing the environmental pollution.

[60] In addition, the side reinforcement is formed to minimize the deformation phenomenon caused by the vibration when the side of the housing is struck, where the main body of the housing is fixed by the steady rest and is connected to construction equipment like excavator at the top the housing, and the lower reinforcement is formed in a plate shape at the lower portion, which is made up of abrasion-resistant material resistant to abrasion, so that vibration resulting from striking and abrasion due to vertical reciprocation of the chisel at the upper and lower portion can be minimized, thereby extending the lifespan.

[61] While the present invention has been described with reference to the particular il¬ lustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

Claims

[ 1 ] 1. A hydraulic hitting type jackhammer having an auto lubricant feeder and a pneumatic pressure supply, the jackhammer comprising: a) a housing 110 including a connecting bar 111 on the top thereof for connecting with a construction equipment such as an excavator, a hydraulic- connection port 112 to be connected with hydraulic pressure at the front in the form of bellows, a through-hole type lubricant feed hole 113 at the front of the lower portion thereof for feeding manually the lubricant, and a steady rest 114 formed in plural at the top, bottom, left, and right of the inside thereof for suppressing vibration; b) a main body 120 fixed inside the housing 110 by the steady rest 114 and formed in such a manner to supply a main hydraulic pressure valve 122 with hydraulic pressure which is introduced from the hydraulic-connection port 112 to the hydraulic pressure supply port 123 formed at the front of the top thereof, the main body 110 having a piston 121 formed at the center for reciprocating vertically by the hydraulic pressure fed through the main hydraulic pressure valve 122, a compressed-gas chamber 124 formed at the upper portion and filled with gas to be compressed by the piston 121 in order to form the striking force downwardly, a temporary oil storage 125 formed at the front of the center for storing oil temporarily in order to prevent the leakage caused by the change of oil resulting from the rapid drop of the piston 121, a chisel 126 at the lower portion supported by the chisel pin 126a and the thrust ring 127 at the location struck by the piston 121 and for breaking the object to be broken, a shielding cover 128 provided below the support portion of the chisel 126 for preventing the introduction of foreign matters, and a through-hole type manual supply port 129 formed at the front of the lower portion for supplying lubricant to a side of the thrust ring 127; and c) a lubricant feeder 130 including a lubricant supply valve 131 for supplying lubricant from the front of the upper portion of the main body 120 such that the lubricant is automatically supplied through a lubricant feed port 133 to the other side of the thrust ring 127 via a lubricant feed passageway 132 internally, and a lubricant connecting port 134 connected to the outside through the other side of the lubricant feed port 133 and for supplying lubricant.

[2] 2. A hydraulic hitting type jackhammer according to claim 1, wherein a side re- inforcement 115 is formed and projected at the side of the housing 110 in order to prevent twisting caused by vibration, and a lower reinforcement 116 made of abrasion-resistant material is formed at the bottom of the housing 110 in a plate- shape, thereby minimizing vibration resulting from striking operation and abrasion caused by upward-and-downward operation the upper and lower chisel 126 [3] 3. A hydraulic hitting type jackhammer according to claim 1, wherein a pneumatic pressure supply valve 141 is formed at the upper portion of the front of the main body 120 for supplying pneumatic pressure, and a pneumatic pressure supply 140 is formed such that a pneumatic pressure supply 140 injects continuously air towards a pneumatic pressure supply port 143 formed at one side of the piston 121 via a pneumatic pressure supply passageway 142 in order to form a shielding air-curtain at the lower portion of the piston 121, thereby preventing introduction of foreign matters and reverse flow.