Other

Heinrich Zenhausern

Robert Bruce Weber

A climbing rung for anchoring to the wall of a manhole shaft. The climbing rung has a generally U-shaped core of two parallel legs spaced apart by a central tread. Each leg is sheathed in a pre-formed protective sleeve, closed at one end, by inserting the leg into the mouth of the sleeve. An injection moulded protective coating is bonded to the core of the tread and the core of each leg, extending to proximate the mouth of each pre-formed sleeve when a leg is sheathed therein, forming a sealing interface proximate the annular lip circumferentially defining the mouth of each sleeve. A method includes gripping the climbing rung only proximate the pre-formed protective sleeves when both legs are sheathed therein, so as to permit positioning the core of the tread and legs, extending only to proximate the mouth of each pre-formed protective sleeve, in an injection moulded cavity radially spaced equidistant the surface of the mould cavity. Advantageously, positioning pins inside the injection mould cavity for radially spacing the core of the climbing rung from the surface of the mould cavity are thereby not required. The method also includes alternatively gripping at least two oppositely spaced portions of the core of the climbing rung and alternately coating the portion of the climbing rung opposite the end which is being gripped.

Process for making encapsulated anchor rung

A climbing rung is provied for anchoring to the wall of a manhole shaft. The climbing rung has a generally U-shaped core of two parallel legs spaced apart by a central tread. Each leg is sheathed in a pre-formed protective sleeve, closed at one end, by inserting the leg into the mounth of the sleeve. An injection moulded protective coating is bonded to the core of the tread and the core of each leg, extending to proximate the mouth of each pre-formed sleeve when a leg is sheathed therein, forming a sealing interface proximate the annular lip circumferentially defining the mouth of each sleeve. A method is provided including the steps of gripping the climbing rung only proximate the pre-formed protective sleeves when both legs are sheathed therein, so as to permit positioning the core of the tread and legs, extending only to proximate the mouth of each pre-formed protective sleeve, in an injection moulded cavity radially spaced equidistant the surface of the mould cavity. Advantageously, positioning pins inside the injection mould cavity for radially spacing the core of the climbing rung from the surface of the mould cavity are thereby not required. In another aspect of the invention it is not necessary to grip the step using pre-formed protective sleeves--all that is necessary is to alternately grip at last two oppositely spaced portions of the core of the climbing rung; alternately coating the portion of the climbing rung opposite the end which is being gripped.

Encapsulated anchor rung and process for making same

A u-shaped climbing rung to be anchored in a bore hole in a wall, the climbing rung having two parallel legs each leg having two ends, one end of each leg being connected to a transverse central element or tread spaced a predetermined distance below the parallel legs and having the other end for anchoring in a wall, the legs and tread being completely encapsulated in a synthetic protective coat having an outer configuration adapted to present each end of the legs remote the tread for anchoring the climbing rung in the wall. Behind said anchoring means each encapsulated end receives a soft elastic and tightly fitting and slidable sealing collar. At least one surface of either the encapsulated end behind the anchoring means or the inside surface of the sealing collar presents alternating raised rings and annular grooves to frictionally engage and seal the interface between the encapsulated end and the inside surface of the sealing collar. Each sealing collar frictionally slides along each leg to present a sealing face to an abutting wall deforming when abutting the surface of the wall to accommodate the surface configuration of the wall surrounding the bore hole whereby the combination of the anchor for securely anchoring the end of each leg in a wall, the alternating raised rings and annular grooves and the sealing collar thereby precludes water and corrosive material from penetrating the bore hole.

Anchor step

A u-shaped climbing rung to be anchored in a bore hole in a wall, the climbing rung being two parallel legs each leg having two ends, one end of each leg being connected to a transverse central element or tread spaced a predetermined distance below the parallel legs and having the other end for anchoring in a wall, the legs and tread being completely encapsulated in a synthetic protective coat having an outer configuration adapted to present each end of the legs remote the tread for anchoring the climbing rung in the wall, each encapsulated end having an anchor for anchoring the end of each leg, in a wall, and two soft elastic and tightly fitting sealing collars located on the legs spaced from the end of the legs securely anchored in the wall to frictionally slide along the legs to present a sealing face to an abutting wall deforming when abutting the surface of the wall to accommodate the surface configuration of the wall surrounding the bore hole whereby the combination of the anchor for securely anchoring the end of each leg in a wall and the sealing collar thereby preclude water and corrosive material from penetrating the bore hole.

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Urdorf/Zurich, Switzerland

Heinrich Zenhausern