Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co.

Delmag Maschinenfabrik

Inotec Gmbh Gesellschaft Fur Innovative Technik

Winfried Scheid

Achim Kehrberger

Hinrich Kattentidt

Eberhard V Ranft

Nikodemus Heinz

Gerhard Mutschler

Stefan Mewes

Karl-Heinz Schoniger

In order to be able to shift a leader ( ), which is disposed on a travelling chassis ( ) via a carrying mechanism ( ), both towards the front and also towards the rear into a substantially horizontal position, the carrying mechanism ( ) has at least one guide arm ( ) which is adjustable in length and which comprises a double-acting hydraulic working cylinder.

Mobile working apparatus

A drilling tool, the drill head ( ) of which can be connected either to a drill ( ) or a casing string ( ), is also fitted with an automatic direction reversing mechanism ( ) which is designed so that the driven part ( ) of the drill head ( ) executes backward and forward movements of less than 90&deg;, but preferably 20&deg; to 30&deg;. In this way the drill head can also strike the casing string when sinking it.

Drilling tool

A drilling device comprises a drive motor (22), which sets a tool (36) in rotation, and a feed motor (14) which axially displaces the tool. Load sensors (12, 18, 20, 24) detect not only the tool feedrate (V) but also at least two of the three parameters, tool feed force (F), tool torque (M) and tool speed (U). An evaluation and control unit (70) evaluates the above-mentioned parameters and via control units (38, 42) activates the drive motor (22) and the feed motor (14) in such a way that the tool feed force (F) and the tool speed (U) or the tool torque (M) assume values at which the tool feedrate (V) for a specific ground hardness (H) is maximized.

Drill with motor drive and feed

A boring tool with two driving heads which are used to sink a casing string and a borer string includes a controllable coupling mechanism fitted between the two driving heads. A mechanism is also provided for the lower driving head, such that the driving head is subjected to an additional downwards acting force. When both driving heads are coupled, the upper driving head is also subjected to an additional, downwards acting vertical force. In order to free the top end of the casing string, the coupling mechanism can be released so that the upper driving head can be fully raised, whilst the lower driving head remains in position adjacent to the ground.

Boring tool

An illuminated display unit such as a board with a house number thereon or an advertising billboard, has a light guide panel. At least one electrical illuminating element is arranged in the vicinity of at least one lateral limiting edge thereof. The light guide panel serves for illuminating logo symbols, which are preferably in the form of film or of vapor coated layers, on the light guide panel. At least one of the lateral limiting edges of the light guide panel is provided with a light guide batten whose thickness is in excess of the thickness of the light guide panel and at least one of the illuminating elements is mounted in the batten. The transition between the light guide batten and the light guide panel is designed so as to have a high optical conductivity or transmittivity. The external surfaces of the light guide batten are provided at least partly with an inwardly reflecting layer. This makes it possible for the light of the illuminating elements, which are more especially in the form of LED's with a large diameter, to be fully introduced in substantially thinner light guide panels in order to reduce costs and weight.

Growing community of inventors

Ebersbach, Germany

Winfried Scheid