Impact tool for a hammer device and method for opening a tapping opening

Abstract

Impact tool and method for a hammer device that includes impact tool housing and tubular piston structured and arranged for axial displacement in impact tool housing via pressure medium. Tubular piston has essentially radial pressure surfaces structured and arranged on opposite portions of tubular piston to be acted on with pressure medium. Grooves are formed in impact tool housing that are structured and arranged for a reversal of a direction of a pressure medium impingement on pressure surfaces and discharge or recirculation of medium. Grooves include a control recess formed in tubular piston and at least two control grooves for a shift of pressure medium impingement on pressure surfaces that are arranged axially offset in impact tool housing. A controller is structured and arranged to alternatively activate one of the at least two control grooves via connection channels.

Claims

1. An impact tool for a hammer device, comprising: an impact tool housing; a tubular piston structured and arranged for axial displacement in two directions in the impact tool housing via a pressure medium, the tubular piston having essentially radial pressure surfaces structured and arranged on opposite portions of the tubular piston to be acted on with the pressure medium; a central or proximal adjustable transfer part is connectable to at least one tool and has anvil parts on both sides for receiving impact energy from the tubular piston; grooves formed in the tubular piston to form the essentially radial pressure surfaces, the grooves being structured and arranged for a reversal of a direction of the tubular piston according to a pressure medium impingement on the pressure surfaces; a control recess formed in the tubular piston between the radial pressure surfaces, being structured and arranged to communicate with at least two control grooves formed to be axially offset from each other in the impact tool housing; and a controller structured and arranged to alternatively activate one of the at least two control grooves via connection channels, which define alternative displacement distances or acceleration paths for the tubular piston.

2. The impact tool according to claim 1 structured and arranged to transfer impact energy axially in both directions.

3. The impact tool according to claim 1 being an impact tool for a hammer drill for opening a tapping opening of a metallurgical vessel.

4. The impact tool according to claim 1, wherein the controller includes a cylindrical recess coupled to the connection channels and an actuating piston in the cylindrical recess structured and arranged to respectively activate one of the at least two control grooves.

5. The impact tool according to claim 1, wherein the actuating piston is positionable one of manually or against a spring force via a pressure medium in the cylindrical recess.

6. The impact tool according to claim 5, further comprising a hammer device, wherein the actuating piston in the control is positionally adjustable depending on an impact direction of the hammer.

7. The impact tool according to claim 6, wherein an adjustment and a withdrawal of the hammer device takes place in situ.

8. An impact tool for a hammer device, comprising: an impact tool housing having at least two axially offset control grooves coupled to respective connection channels; a tubular piston structured and arranged for axial displacement in two directions in the impact tool housing via a pressure medium; two grooves formed in the tubular piston that are axially displaced from each other so that each of the two grooves comprise a pressure surface structured and arranged to be acted on with the pressure medium so as to move the tubular piston in a first or second impact direction; a control recess formed in the tubular piston between the radial pressure surfaces that is structured and arranged to communicate with the at least two axially offset control grooves; and a controller structured and arranged to alternatively activate one of the at least two axially offset control grooves via its respective connection channel to define at least one of different displacement distances or acceleration paths for the tubular piston in the first and second impact directions.

9. The impact tool according to claim 8, further comprising a central or proximal adjustable transfer part is connectable to at least one tool and has anvil parts on both sides for receiving impact energy from the tubular piston.

10. The impact tool according to claim 8 structured and arranged to transfer impact energy axially in the two directions.

11. The impact tool according to claim 8 being an impact tool for a hammer drill structured for opening a tapping opening of a metallurgical vessel.

12. The impact tool according to claim 8 being an impact tool for a hammer drill structured for opening and for closing a tapping opening of a metallurgical vessel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The embodiments of the present invention are further described in the detailed description which follows, in reference to the noted drawing by way of a non-limiting example of an exemplary embodiment of the present invention, and wherein:

(2) FIG. 1 illustrates an impact tool with a controller for a tubular piston

DETAILED DESCRIPTION OF ME EMBODIMENTS

(3) The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

(4) FIG. 1 shows an impact tool according to embodiments of the invention. However, a transfer part of the impact energy with anvil parts arranged on both sides and the tool(s) are not shown.

(5) A tubular piston 1 is arranged in an impact tool housing 2 in an axially displaceable manner. Tubular piston 1 includes distal pressure surfaces 11 and 11 arranged on opposite sides or ends that are structured to move the piston 1 with any impingement of a pressure medium on the pressure surfaces 11 and 11.

(6) A direction reversal for the pressure applied on respective pressure surfaces 11 and 11 of the tubular piston 1 is carried out with a device in which the supply and discharge of the pressure medium are changed against a spring force via pressure or relaxation of a control device.

(7) For operation, a feed line 13 for a pressure medium for the impact tool is arranged in a recess formed in the impact tool housing 2.

(8) With an impingement of the pressure medium on pressure surface 11, the tubular piston 1 is axially displaced in the housing 2, i.e., to the right in the illustrated embodiment, until a connection of the feed line 13 of pressure medium 13 and a control recess 12 in the tubular piston 1 is achieved.

(9) A direction reversal of the pressure applied on the pressure surface 11 thus occurs, which forces the tubular piston 1 in the opposite direction, i.e., to the left in the illustrated embodiment.

(10) A recess 12 on the tubular piston 1 projects or extends beyond two control grooves 3, 3 with connection channels 31, 31 coupled to a controller 4. Further, controller 4 includes connection channels 42, 42, which are continued in a recess 41 with an actuating piston 43.

(11) The actuating piston 43 has a recess on an outer surface that is connected to an inner cavity in order to form a discharge channel 51 for a pressure medium. The discharge channel 51 cooperates with a discharge line 5 for a relaxed pressure medium.

(12) The actuating piston 43 can be displaced against a spring so that the recess on the outer surface activates either (a) the channel 31 in the impact tool housing 2 and the channel 42 in the controller 4 or (b) the axially spaced channel 31 in the impact tool housing 2 and channel 42 in the controller 4. This results in alternatively a shorter or longer path of the tubular piston 1 until the direction reversal of the impingement of the pressure surfaces 11 and 11.

(13) A positioning of the actuating piston 43 in the controller 4 can be carried out in an advantageous manner respectively by the pressure medium for an adjustment or for a retraction of the hammer drill so that an impact energy and/or impact frequency automatically controlled with the axial movement direction thereof can be achieved.

(14) It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to an exemplary embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.

LIST OF REFERENCE NUMBERS

(15) 1 Tubular piston 11, 11 Pressure surfaces on the tubular piston 12 Control recess on the tubular piston 13 Feed line of the pressure medium 2 Impact tool housing 3, 3 Control grooves in the impact tool housing 31, 31 Connection channels 4 Controller 41 Recess in the controller 43 Actuating piston 5 Discharge line for relaxed pressure medium 51 Discharge channel in the impact tool housing