US3708151A - Method and apparatus for clamping planks,boards,poles,pipes,and the like,to pile drivers and pulling devices - Google Patents

Method and apparatus for clamping planks,boards,poles,pipes,and the like,to pile drivers and pulling devices Download PDF

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Publication number
US3708151A
US3708151A US00096867A US3708151DA US3708151A US 3708151 A US3708151 A US 3708151A US 00096867 A US00096867 A US 00096867A US 3708151D A US3708151D A US 3708151DA US 3708151 A US3708151 A US 3708151A
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United States
Prior art keywords
mass
arrangement according
piston
clamping arrangement
fluid
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Expired - Lifetime
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US00096867A
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English (en)
Inventor
G Schulin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wacker Werke GmbH and Co KG
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Wacker Werke GmbH and Co KG
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/10—Follow-blocks of pile-drivers or like devices

Definitions

  • ABSTRACT A clamping arrangement, and a method of operation thereof, for clamping a work member to a reciproca- [30] Foreign Application Priority Dam ble driving mass.
  • the clamp arrangement has a pair of Dec. 12, 1969 Germany ..P 19 62 318.8 jaws which are urged toward each other by fluid operable means which is energized by a pump which :LtS-CCll.
  • Hydraulic clamping pliers or holders for pile driving and pulling devices have become known by means of which the article to be driven or pulled, for instance, steel profiles, sheet piles or piles are clamped fast to the pile driving or pulling device.
  • Such clamping holders are employed primarily in connection with vibration pile drivers or hammers.
  • the pressure of the hydraulic fluid for actuating such clamping devices i.e., for producing the clamping pressure, is produced manually or by foot pumps or by motor driven pumps. Such pumps are located either in the vicinity of the driving or pulling device on theground. Such pressure also is produced by motor pumps which are mounted on the driving or pulling device.
  • the hydraulic conduit for instance, the high-pressure hose
  • the high-pressure hose which leads to the driving or pullingdevice interferes with the working of the device on the building site. This is due primarily to the fact that the hose in tightened condition is rather stiff and its flexibility is rather limited as a result thereof. Moreover, such hose is exposed to the danger of being damaged, in view of the relatively rough building site operation and the traffic of the building site. This may cause accidents because in such instances the clamping connection may be disengaged. A further difficulty consists in the breaking of the hoses or hose connections in view of the acceleration during the ramming and pulling operation.
  • an object of the invention to provide a method and apparatus for driving and pulling devices operated directly by internal combustion, which without interfering conduits from the pump to the apparatus as, for instance, control lines, can be driven without the aid of foreign power sources such as electric current or compressed air.
  • FIG. 1 illustrates an embodiment of ,a clamping device according to the invention as installed in a driving or pulling device.
  • FIG. 2 illustrates an embodiment of an automatic pump occupying its intermediate position of operation.
  • the present invention is'characterized primarily in that the oscillating pushing mass actuates a pump which draws a pressure medium from a pressure medium reservoir and conveys said pressure medium through valves and control lines to clamping bodies movably arranged on the working implement.
  • oscillating pushing mass acts upon a cylinder which is resiliently arranged and operates as pump.
  • This cylinder communicates through control lines and valves with a chamber containing a pressure medium.
  • the cylinder is adapted to act by way of a fixedly arranged piston, valves and control pistons through a pressure medium upon a movably arranged clamping
  • the cylinder may be designed as a stepped cylinder and may be movable by the oscillating pushing mass against the thrust of a spring.
  • the discharge valve is held by means of two serially arranged pressure springs. Between said two pressure springs, a control piston is movably arranged which may be provided with a calibrated bore.
  • the spring constant of the two pressure springs may be different.
  • the pressure medium reservoir may be so designed that a slight overpressure prevails therein with regard to the atmosphere.
  • the automatic pump is designed so that during the driving and also with power strokes in downward direction, and furthermore also during pulling action with power strokes in upward direction the same will automatically clamp in the respective subject as, for instance, a board.
  • the automatic pump during the entire driving or pulling operation, in other words, during the operation of the device, will remain in pumping readiness in order to hold the required clampingpressure and to cover any possible leakage.
  • the maximum pressure is limited without the necessity of providing a pressure limiting control or overflow valve. As a result thereof, unnecessary heating up of the pressure fluid will occur and parts subject to wear and disorder will be avoided.
  • a further advantage of the invention consists in that the automatic pump is so designed that it will also function properly when the oscillating pushing mass carries out uneven strokes, in other words, when the reversing points or dead center points are not always located at the same points.
  • a driving or pulling device the oscillating pushing mass of which, is driven by an internal combustion engine.
  • engine may, for instance, be a driving machine of the type of a vibration tamper.
  • the installation may also be effected in a driving or pulling device, the pushing rammer or driver mass of which is represented, for instance, directly by the piston of a cylinder of an air cushioned free piston-type engine.
  • the flange 1 of a driving engine (not further illustrated), has arranged thereon the driver mass 2 which is slidable in the body 3.
  • the arrangement furthermore comprises a return spring 4 which may also be termed a supporting spring which softly supports the driver mass 2, including the driving engine, on the post to be driven.
  • spring 4 will be omitted.
  • An exchangable clamping jaw 5 is mounted on the body 3.
  • a clamping jaw 6 opposite the preloaded pressure spring 7 is movably arranged in the body 3. Sealing members 8 may be provided between the clamping jaws 6 and the body 3.
  • the automatic pump 10 communicates with the pressure medium reservoir 9 through a control line 115.
  • the automatic pump illustrated in greater detail in FIG. 2 represents an embodiments to which the invention is not limited.
  • the pump of FIG. 2 comprises a stepped piston 101, a stepped cylinder 102 and a pressure spring 103.
  • a suction valve 104 and an outlet valve 105 are installed in said stepped piston.
  • the lower end of the mass 2 engages upon the face side of the pump 10 (FIG. 1).
  • the same pump 10 (FIG. 1) is drawn out greatly in FIG. 2.
  • the hollow space or chamber of the parts 2 and 3 (FIG. 1) is occupied neither by liquid nor gas. There is also no seal provided to the outside.
  • the clamping jaw 6 is, by the pressure of spring 7, pressed against the toothed clamping jaw 5 and has its end face first in direct engagement with the toothed surface of the clamping jaw 5.
  • the clamping jaw 6 will, in view of the inclined introducing surfaces on the clamping jaw 5 and clamping jaw 6 be displaced against the thrust of spring 7 into the cylinder of the body 3.
  • a portion of the pressure medium in the cylinder chamber will be pressed back into the supply chamber or reservoir 9.
  • the channel 109 leading to the cylinder chamber and reservoir 9 is always open, during the standstill of the device.
  • the clamping jaw 6 will, after touching down or setting, directly engage the profile to be pulled. This is the case also when during thetraveling inbound or moving-in,
  • the movable stepped cylinder 102 When starting the driving or pulling device, the movable stepped cylinder 102 is pressed against the thrust of spring 103 downwardly by a short push of the ram mass oscillating in vertical direction. By the abutment of the stepped cylinder, the suction operation of the pump is brought about, whereas the pumping operation proper, the delivery of the pressure fluid into the cylinder being effected by the pressure spring 103.
  • the stepped cylinder will carry out approximately the fully feeding strokes until the required clamping pressure has been realized.
  • the pump by itself stops delivering because the spring selected in conformity with the active step cross section of the pump will no longer be able to press the movable cylinder upwardly against the fluid pressure.
  • a pressure limiting value overpressure discharge valve
  • the spring of the discharge valve 105 comprises two serially arranged pressure springs 111 and 112, between which there is inserted an easily movable control piston 106, which forms the control valve spool.
  • this control piston 106 is in equilibrium with the two pressure springs 111 and 112 and stands upwardly to such an extent that the control bore 109 is not covered thereby, either having an over dimensioned but fixed bearing guide play or and having a calibrated bore.
  • Pressure fluid delivered by the pump can pass through this bore or through this mantle gap into the passage 110 and to the cylinder chamber. In view of the pressure drop which during a pressure fluid supply in operation has become effective in the control piston 106, the latter is pressed downwardly thereby closing the control bore 109.
  • the pressure fluid volume delivered by the pump is thus able to produce the required clamping pressure.
  • This automatic pump will first, without particular pumping operation, maintain the required clamping pressure because spring 103, which has deliberately been designed with a relatively flat characteristic, is loaded. Leakage losses, and the like, are first covered or made up by the stored work of the pressure spring 103. Beyond this, the pump remains in continuous readiness to deliver, to scoop up and to pump. This occurs when the stepped cylinder 102 has moved upwardly to such an extent that cylinder 102 is, by the ram mass 2, continuously oscillating during the operation, actuated again to perform a suction stroke and pushed downwardly for clamping the pressure spring 103.
  • This design also makes it possible to employ the automatic pump and thus the entire clamping device for clamping the pole during the drawing operation as well as when driving with posts, or the like.
  • the last mentioned arrangement hasthe advantage that, for instance, the bulkhead wall-steel profiles have their upper end face protected against breakage.
  • control piston 106 will have'the tendency to adjust itself in conformity with the force balancing weight of the two springs 1 11 and 112 and to move upwardly. In view of this movement of the controlpiston in upward direction, it will, from a certain stroke performed by the control piston 106, gradually free the control bore 109 so that pressure fluid can escape from the pressure into the suction chamber. When this occurs, the pump will immediately deliver pressure fluid whereby the control piston 106 will again be displaced to its closing position.
  • control piston 106 In practice, the control piston 106 always remains close to the control limit so that continuously small leakage losses are to be replaced by the pump. Moreover, in practice, due to the accelerating pushes exerted during the driving or pulling operation upon the body 2 and thus upon the stepped piston 101 arranged therein, slight relative movements will occur between the control bore 109 in the stepped piston 101 and the control piston 106. In order to keep the effect of these relative movements upon the control operation rather low, the control edge of the control piston 106 is not sharp edged, but is conical or inclined according to any practical curve shape.
  • control piston 106 When, after stopping the device, the delivery of pressure fluid also stops, the control piston 106 will completely free the cross section of the control bore 109. This is due, in view of the displacement by the lower spring 111 which is under increased load, so that the clamping pressure completely disappears and the driving or pulling device can be lifted from the article to be pulled.
  • the clamping device When the clamping device is designed as a hydraulic clamping device, it is advantageous to maintain pressure fluid reservoir 9, for instance, by means of a resilient piston, under continuous slight overpressure. In this way it will be realized that, forinstance, when withdrawing the device, in other words, when it does not work, air can enter the control lines. In this way, the working device will be location-nonsensitive, which means it may also laterally be placed on the ground without air being able to enter the control lines and the pump. The compressability of air would otherwise oppose a fast attraction of the clamping device.
  • a clamping arrangement for clamping a work member to a reciprocable driving mass which comprises: a pair of opposed jaws adapted to receive the workpiece therebetween and supported by said mass, motor means operatively associated with said jaws and energizable for urging said jaws toward each other, power developing means supported by said mass and actuated in response to reciprocation of said mass and operatively connected to said motor means to supply energy thereto when actuated.
  • said motor means comprises fluid operable means associated with at least one said jaw
  • said power developing means comprising a pump having a discharge side connected to said fluid operable means, and a fluid reservoir carried by said mass and connected to the inlet side of said pump, said pump comprising a piston reciprocable in the same direction as said mass.
  • a clamping arrangement-according to claim 2 which includes a body reciprocable on said mass and having said jaws and said pump and reservoir mounted thereon.
  • a clamping arrangement according to claim 3 in which said pump piston is adapted to be engaged and actuated in one direction by said mass when the mass and body move relatively in one direction, and a spring I acting on said piston to move it in the other direction.
  • a clamping arrangement in which said piston is sleeve-like, a cylindrical element on said body on which said piston reciprocates, and a pumping chamber formed by said piston and cylindrical element.
  • a clamping arrangement according to claim 6 in which the bore through said piston has a step therein so the bore has two different diameters.
  • a clamping arrangement according to claim 6 in which said cylindrical element is stepped and has a portion fitting each diameter of the bore in said piston.
  • a clamping arrangement in which the bore in the piston and the cylindrical element are stepped so as to have shoulders which face each other thereby to define a pumping chamber which expands and contracts as said piston reciprocates relative to said cylindrical element, a first passage in said cylindrical element connecting said pumping chamber to said reservoir and a first check valve therein opening toward said chamber, a second passage in said cylindrical element connecting said chamber to said fluid operable means and a second check valve therein opening away from said chamber, and a control valve between said fluid operable means and said reservoir for releasing pressure from said fluid operable means.
  • a clamping arrangement according to claim 9 which includes two springs in series on the downstream side of said second valve biasing said second valve toward closed position.
  • a clamping arrangement according to claim 10 in which the spring constants of said springs differ from each other.
  • a clamping arrangement according to claim 12 which includes a restricted passage interconnecting the opposite ends of said control valve.
  • a clamping arrangement according to claim 12 in which said control valve interrupts communication between said fluid operable means and said reservoir during the supply of pressure fluid to said fluid operable means by said pump.
  • a clamping arrangement in which comprises means to maintain a predetermined minimum pressure on the fluid in said reservoir.
  • a clamping arrangement according to claim 2 which includes spring means biasing said jaws toward each other.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Clamps And Clips (AREA)
US00096867A 1969-12-12 1970-12-10 Method and apparatus for clamping planks,boards,poles,pipes,and the like,to pile drivers and pulling devices Expired - Lifetime US3708151A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1962318A DE1962318C3 (de) 1969-12-12 1969-12-12 Vorrichtung zum Klemmen von Bohlen, Dielen, Pfählen, Rohren usw. an Rammund Ziehgeräten

Publications (1)

Publication Number Publication Date
US3708151A true US3708151A (en) 1973-01-02

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Application Number Title Priority Date Filing Date
US00096867A Expired - Lifetime US3708151A (en) 1969-12-12 1970-12-10 Method and apparatus for clamping planks,boards,poles,pipes,and the like,to pile drivers and pulling devices

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Country Link
US (1) US3708151A (enExample)
DE (1) DE1962318C3 (enExample)
FR (1) FR2072760A5 (enExample)
GB (1) GB1289395A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3545880A1 (de) * 1985-12-23 1987-06-25 Lindenmeyer Gmbh & Co Geb Dieselramme
EP2559813B1 (de) * 2011-08-17 2013-07-17 ABI Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik und Vertriebsgesellschaft mbH Klemmzange

Also Published As

Publication number Publication date
DE1962318A1 (de) 1971-09-23
DE1962318B2 (de) 1973-02-08
GB1289395A (enExample) 1972-09-20
DE1962318C3 (de) 1973-09-13
FR2072760A5 (enExample) 1971-09-24

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