Ladder rung implanter

A manhole step implanter comprising in combination:

• a step carrier for releasably supporting a step to be implanted,
• means for supporting the step carrier within a green manhole section in a position for projecting the arm of a step carried by the carrier into an opposed wall,
• said means including mechanism for shifting the carrier toward and away from the manhole wall to project into and embed the arm of a carried step in the wall,
• said mechanism having locating means for engaging the manhole casting form to position the step carrier within the manhole section in predetermined relation with the manhole wall,
• said locating means being arranged in vertically spaced apart relation along said mechanism for engaging the manhole casting form adjacent to the upper and lower ends thereof and being shiftable into and out of engagement with the casting form at said upper and lower ends thereof.

A manhole step implanter comprising in combination:

• a step carrier for releasably supporting a step to be implanted,
• means for supporting the step carrier within a green manhole section in a position for projecting the arm of a step carried by the carrier into an opposed wall,
• said means including mechanism for shifting the carrier toward and away from the manhole wall to project into and embed the arm of a carried step in the wall, and
• said mechanism being portable and adaptped to be inserted through one end of a green manhole section whose axis is arranged vertically, and said mechanism further including locator means for engaging portions of the casting form and positioning the step carrier in predetermined position within the manhole section preparatory to implanting a step.

A manhole step implanter comprising in combination:

• a step carrier for releasably supporting a step to be implanted,
• means for supporting the step carrier within a green manhole section in a position for projecting the arm of a step carried by the carrier into an opposed wall,
• said means including mechanism for shifting the carrier toward and away from the manhole wall to project into and embed the arm of a carried step in the wall, and
• said mechanism including a base and an upstanding pillar on the base, locator means on the base for engaging a manhole casting form to position the same relative to the pillar when the casting form is placed on the base with the pillar projecting upwardly therethrough, and said step carrier being mounted for laterally shiftable movement on the pillar.

A manhole step implanter comprising, in combination:

• a step carrier for releasably supporting at least one step to be implanted, the said step having at least one projecting arm for embedment in a green concrete wall of a manhole;
• a pillar structure for supporting the step carrier within a green manhole section in a position so that the free end of the arm of a step to be affixed is disposed in confronting relation with the green concrete manhole wall and such that the plane of the step is substantially perpendicular to the axis of the manhole;
• fluid pressure means carried by the pillar structure for applying a continuous and uninterrupted force to the step carried thereby into the green concrete wall and of a magnitude to overcome the resistance of penetration of the arm thereinto thereby to cause the arm to be advanced into the wall in a continuous and uninterrupted manner;
• and
• locator means carried by the pillar structure for anchoring the pillar structure within a green manhole section preparatory to such implantation including one or more shiftable members for engaging the base ring portion of the manhole casting form to position and firmly secure the pillar structure in predetermined relation with the manhole wall.

A manhole step implanter comprising, in combination:

• a step carrier for releasably supporting at least one step to be implanted, the said step having at least one projecting arm for embedment in a green concrete wall of a manhole;
• a pillar structure for supporting the step carrier within a green manhole section in a position so that the free end of the arm of a step to be affixed is disposed in confronting relation with the green concrete manhole wall and such that the plane of the step is approximately perpendicular to the axis of the manhole;
• fluid pressure means carried by the pillar structure for applying a continuous and uninterrupted force to the step carrier in the direction to urge the arm of the step carried thereby into the green concrete wall and of a magnitude to overcome the resistance of penetration of the arm thereinto thereby to cause the arm to be advanced into the wall in a continuous and uninterrupted manner;
• and
• locator means carried by the pillar structure for anchoring the pillar structure within the green manhole section in which it is enclosed and preparatory to such implantation including shiftable members for engaging approximately diametrically opposite portions of the manhole casting form to position and firmly secure the pillar structure in predetermined relation with the manhole wall.