US3250335A - Device for use in percussion mechanisms - Google Patents

Device for use in percussion mechanisms Download PDF

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Publication number
US3250335A
US3250335A US388909A US38890964A US3250335A US 3250335 A US3250335 A US 3250335A US 388909 A US388909 A US 388909A US 38890964 A US38890964 A US 38890964A US 3250335 A US3250335 A US 3250335A
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United States
Prior art keywords
piston
working
cylinder
driving
damping
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Expired - Lifetime
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US388909A
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English (en)
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Joelson Karl Evert Anders
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Individual
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Individual
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Publication of US3250335A publication Critical patent/US3250335A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B25D17/245—Damping the reaction force using a fluid

Definitions

  • the present invention concerns an arrangement for use in percussion mechanisms which include a movable working piston in a cylinder, During its working stroke this working piston moves toward a tool, a working surface, or the like under the influence of a suitable driving mechanism such as an eccentric, a spring, or a hydraulic mechanism.
  • a suitable driving mechanism such as an eccentric, a spring, or a hydraulic mechanism.
  • Such percussion mechanisms or tools are used in drills (rock drills), hammers or tapping machines for example. It often happens during operation of these machines that the machine bounces back so that the piston does not contact the working tool. This also occurs for example when the operator tries to loosen a wedged drill or tapping bar. In this case the machine is withdrawn or lifted upward simultaneously with operating.
  • the damping effect of the device may be adjustable, and the damping device arrangement is preferably of the hydraulic type having a chamber in which the damping fluid is constructed by a narrow duct.
  • the invention can be utilized advantageously with different types of percussion mechanisms.
  • the percussion mechanism may have a hydraulically driven piston or have a mechanical stroke arrangement with hydraulic power transfer from a pump unit to the machines striking mechanism itself.
  • the striking mecha nism of these machines can be mechanical or include pneumatic transmission from a primary piston to a striking piston in a known way.
  • the embodiment shown in the drawing includes an outer, closed space or housing 1, which is mainly filled with a pressurized'fluid supplied from container 11 by means of a pump 14 and line 15 in a way described be low.
  • a cylinder 6, which is also filled with fluid, is 10- cated inside the housing.
  • a driving piston 4 which may for example be driven by rotatable driving means such as an eccentric 2 or other suitable means.
  • the eccentric 2 may be connected to a flywheel 3 and may be driven by a hydraulic motor 2a through drive shaft 2b.
  • a working piston or striking piston 8 At the opposite end of cylinder 6, in cylinder section 8a, there is a working piston or striking piston 8. This working piston is sealed with cylinder 6 by means of packing ring 10.
  • the piston 4 may be returned to its starting position by a spring 7.
  • the working piston 8 is shown in its starting position and is returned to this position by a vacuum pressure acting on its upper side.
  • This is achieved by connecting pipe 16 to a vacuum source.
  • This pipe 16 may include a check valve 17.
  • the vacuum source may for example comprise an ejector 18 which may be installed outside the housing 1.
  • Pump 14 pumps fluid from container 11 through pipe 15 to hydraulic motor 2a and from there via conduit 21 through ejector 18 and conduit 22 into housing 1 from which the fluid is returned to container 11 via return conduit 23.
  • Vacuum pressure occurs in pipe 16 in a known way when fluid flows through the ejector, whereby the pressure of the atmosphere acting on the lower side of the piston 8 raises the piston into the position thereof shown in the drawing.
  • Cylinder 6 may communicate with the outer housing or envelope 1 through a passage furnished withcheck valve 5 and through outlet 9 communicating with passage 19 or through passages or grooves 12 and 13 arranged in driving piston 4 and the walls of cylinder 6 respectively.
  • One of the grooves 12 or 13 may be helically shaped so that the position at which these two grooves communicate with each other can be adjusted, for example by rotating driving piston 4.
  • Working piston S has a smaller diameter than driving piston 4 and, correspondingly, the section of cylinder 6 through which working piston 8 moves has a smaller diameter than the section of cylinder 6 through which driving piston 4 moves.
  • the percussion mechanism is furnished with a damping device.
  • the damping device comprises a light casing 25 slideably mounted in cylinder 8a which is carried by piston S.
  • the casing is sealed against the piston at the large diameter portion 26 and at a smaller diameter portion 27.
  • Space 28 communicates through axial passage 29 with the drive fluid in the housing.
  • the drive fluid tends to urge the casing 25 downward.
  • the casing can only be urged so until it bumps against a stop ring 30 located around piston section 27.
  • this stop ring can consist of a steel ring divided into two halves which are mounted in a groove around the periphery of the piston and held together by a spring ring,
  • the damping casing 25 is stopped by a collar 31 in the machine housing. Since the casing 25 has little weight, no damage is done to it or to the housing.
  • the fluid in space 28 is discharged at a controlled speed out through duct 29 and thereby the piston Will be steadily braked.
  • the character of the braking may be changed as desired by giving duct 29 dilierent diameters.
  • the passage area of the duct may be adjustable by including an adjusting means such as an adjustable valve, not shown.
  • On the next working stroke space 28 is filled by driving fluid which is supplied through passage 29 and the damping casing 25 is returned to its position against stop ring 30.
  • the vacuum or air pressure in cylinder 8a may suitably act continually on piston 8, but by using a valve it can be arranged so that the vacuum or air pressure acts only when the piston is to be returned at the end of a stroke. Since the pressure fluid is circulated from container 11 through the hydraulic motor, the ejector, the fluid space in envelope 1 and the ring-shaped space of the damping casing, a cooling of the pressure fluid may be obtained by a separate The ejector may be mounted anywhere in the fluid stream where the speed of the stream is suflicient to achieve the desired low pressure on the suction side of the ejector.
  • check valve 17 in pipe 16 between the ejector and cylinder 8a but such a check valve is advantageous in order to prevent the fluid from reaching the upper side of piston 8 when the pump unit is stationary and also to prevent the fluidv from being sucked down to the piston if the piston, during the last part of the working stroke, creates a greater vacuum than that produced by the ejector.
  • the ejector 18 may also be provided in or connected with the exhaust conduit from an internal combustion engine which rotates the eccentric 2.
  • a percussion mechanism comprising a cylinder, a working piston slide-ably mounted in said cylinder, driving means for driving said Working piston, a damping means movably mounted with respect to said piston to form a fluid containing damping chamber between said working piston and said damping means, and means conecting said chamber to a fluid source outside said chamber.
  • a percussion mechanism comprising a cylinder, a working piston slideably mounted in said cylinder, driving means for driving said working piston, a damping means slideable with respect to said piston and surrounding two portions of said piston, said two portions of said piston.
  • damping means having different diameters and said damping means being sealed against'said two portions to form a fluid containing damping chamber between said working piston and said damping means.
  • a percussion mechanism comprising a cylinder, a working piston slideably mounted in said cylinder, driving means for driving said working piston, a damping means movably mounted with respect to said piston to form a fluid containing damping chamber between said working piston and said damping means, and stop means fixedly secured to said cylinder and in the path of said damping means to stop the motion of said damping means when the working piston approaches the end of its working stroke without contacting its intended working object.
  • a percussion mechanism comprising a cylinder, a working piston slideably mounted in said cylinder, driving means for driving said working piston, hydraulic damping means to gradually slow the movement of the working piston at the end of its working stroke if the working piston is not stopped by contact with its intended working object, at least one liquid flow operated ejector whose suction side is connected to said cylinder to return said piston to its starting position after its working stroke is completed, and hydraulic pump means to circulate liquid through said hydraulic damping means and said ejector.
  • a device for use in a percussion mechanism comprising a cylinder, a piston slidably mounted in said cylinder, a damping means movably mounted with respect to said piston to form a fluid containing damping chamber between said piston and said damping means, and stop means fixedly secured to said cylinder and in the path of said damping means to stop the motion of said damping means when the piston approaches the end of its movement path in the cylinder.
  • a device for use in a percussion mechanism comprising a cylinder, a piston slidably mounted in said cylinder, a damping means slidable with respect to said piston and surrounding two portions of said piston, said two portions of said piston having difierent cross sectional areas and said damping means being sealed against said two POI'tiLIlS to form a fluid containing damping chamber between said piston and said damping means.
  • a percussion mechanism comprising a cylinder, a piston slidably mounted in said cylinder, hydraulic damping means to gradually slow the movement of the piston at the end of its movement path in the cylinder, at least one liquid flow operated ejector whose suction side is connected to said cylinder to return said piston to its initial position, and hydraulic pump meansto circulate liquid through said damping means and said ejector.
  • a percussion mechanism comprising a cylinder connected to a vacuum source located outside said cylinder, a working piston slidably mounted in said cylinder, driving means for driving said working piston, fluid damping means to gradually slow the movement of the working piston at the end of its working stroke if the working piston is not stopped by contact with its intended working object, and pneumatic means for returning said piston to its starting position after its working stroke is completed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
US388909A 1963-08-21 1964-08-11 Device for use in percussion mechanisms Expired - Lifetime US3250335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE914663 1963-08-21

Publications (1)

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US3250335A true US3250335A (en) 1966-05-10

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US388909A Expired - Lifetime US3250335A (en) 1963-08-21 1964-08-11 Device for use in percussion mechanisms

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US (1) US3250335A (US08088918-20120103-C00476.png)
AT (1) AT262177B (US08088918-20120103-C00476.png)
BE (1) BE652171A (US08088918-20120103-C00476.png)
GB (1) GB1015380A (US08088918-20120103-C00476.png)
NL (1) NL6409565A (US08088918-20120103-C00476.png)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439755A (en) * 1965-02-11 1969-04-22 Inst Gornogo Dela Imeni Skochi Power percussion tool
US3791149A (en) * 1972-07-11 1974-02-12 Gardner Denver Co Rotary eccentric fluid motor
US3948051A (en) * 1974-08-01 1976-04-06 Marshall Don J Fluid pressure amplifier
US4166507A (en) * 1978-03-06 1979-09-04 Hydroacoustics, Inc. Percussive drilling apparatus
US4187917A (en) * 1977-11-30 1980-02-12 Hydroacoustics, Inc. Pile driver
US4248045A (en) * 1978-04-04 1981-02-03 Turner David L Means for selectively transmitting drive
DE4028304A1 (de) * 1990-09-06 1992-03-12 Krupp Maschinentechnik Hydraulich betriebene schlagdrehbohrvorrichtung, insbesondere zum ankerlochbohren

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111648431A (zh) * 2020-05-29 2020-09-11 中国一冶集团有限公司 一种破碎镐

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1572019A (en) * 1917-12-28 1926-02-09 Ryan Car Company Fluid-pressure hammer
US2024684A (en) * 1934-07-23 1935-12-17 Erfass Karl Axel Ragnar Motor-driven hammer
US2819064A (en) * 1953-08-24 1958-01-07 Renault Suspension devices for vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1572019A (en) * 1917-12-28 1926-02-09 Ryan Car Company Fluid-pressure hammer
US2024684A (en) * 1934-07-23 1935-12-17 Erfass Karl Axel Ragnar Motor-driven hammer
US2819064A (en) * 1953-08-24 1958-01-07 Renault Suspension devices for vehicles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439755A (en) * 1965-02-11 1969-04-22 Inst Gornogo Dela Imeni Skochi Power percussion tool
US3791149A (en) * 1972-07-11 1974-02-12 Gardner Denver Co Rotary eccentric fluid motor
US3948051A (en) * 1974-08-01 1976-04-06 Marshall Don J Fluid pressure amplifier
US4187917A (en) * 1977-11-30 1980-02-12 Hydroacoustics, Inc. Pile driver
US4166507A (en) * 1978-03-06 1979-09-04 Hydroacoustics, Inc. Percussive drilling apparatus
US4248045A (en) * 1978-04-04 1981-02-03 Turner David L Means for selectively transmitting drive
DE4028304A1 (de) * 1990-09-06 1992-03-12 Krupp Maschinentechnik Hydraulich betriebene schlagdrehbohrvorrichtung, insbesondere zum ankerlochbohren

Also Published As

Publication number Publication date
AT262177B (de) 1968-06-10
NL6409565A (US08088918-20120103-C00476.png) 1965-02-22
BE652171A (US08088918-20120103-C00476.png)
GB1015380A (en) 1965-12-31

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