Weep hole for hydraulic jack

Claim 2

In a hydraulic ram device having a reservoir, a metal cylinder having a wall and the inside of the cylinder defining a ram chamber, a ram in said chamber having a pressure end and an annular synthetic elastomer packing mounted thereon and sliding on said wall, said wall having a straight ram stroke limiting passage therein extending transversely through the thickness of the wall and opening at an inlet end into said ram chamber, said passage being traversed by said packing during a maximum power stroke of the ram, an outlet end of the passage being open to said reservoir, said passage having a laser produced short small diameter portion terminating in said inlet end and a large diameter portion terminating in said outlet end, said inlet being located adjacent the position occupied by the pressure end of the ram when the ram has moved to substantially the desired termination point for ram travel, said inlet end including an annular corner edge of said small diameter portion of said passage and said edge being characterized by being a smooth, rounded, solidified molten metal shape as a result of said smaller diameter portion being formed by a laser beam directed from the outside toward the inside of the cylinder the pressure end of said ram having a reduced diameter portion forming an annular seat coaxial with the ram and defined by an integral annular radial shoulder formed on the pressure end and in the metal of the ram, said packing being seated on said seat and having an inner diameter normally smaller than the outer diameter of the radial shoulder whereby the packing must be radially enlarged and telescoped over said radial shoulder in order to assemble it on said seat.

Claim 3

In the method of making a hydraulic ram device, the steps comprising drilling a hole to form an outer portion only of a stroke limiting passage in the wall of a metal cylinder in a manner that leaves a thin web of metal between the bottom of the hole and the inside surface of the cylinder, forming an inner end portion of said passage so that it is smaller in diameter than the outer portion by means of a laser beam directed radially inwardly with respect to the cylinder and which passes through said outer portion and which is energized to penetrate only through said web but not through the diametrically opposite portion of the cylinder wall to form a smooth rounded solidified molten metal inside edge on said inner portion of said passage, stretching a synthetic elastic annular flexible packing over the pressure end of a ram and positioning it on a seat on the ram, assembling said cylinder with other parts of said ram device including slidably inserting said ram with said packing into the cylinder so that the packing is slidable over said inside edge of the passage.

Claim 4

In the method of making a hydraulic ram device, the steps comprising drilling a hole to form an outer portion only of a stroke limiting passage in the wall of a metal cylinder in a manner that leaves a thin web of metal between the bottom of the hole and the inside surface of the cylinder, forming an inner end portion of said passage so that it is smaller in diameter than the outer portion by means of a laser beam directed radially inwardly with respect to the cylinder and which passes through said outer portion and which is energized to penetrate only through said web but not through the diametrically opposite portion of the cylinder wall to form a smooth rounded solidified molten metal inside edge on said inner portion of said passage, stretching a synthetic elastic annular flexible packing over the pressure end of a ram and positioning it on a seat on the ram, assembling said cylinder with other parts of said ram device including slidably inserting said ram with said packing into the cylinder so that the packing is slidable over said inside edge of the passage.

Claim 5

In a hydraulic ram device having a reservoir, a metal cylinder having a wall and the inside of the cylinder wall defining a ram chamber, a ram in said chamber having a pressure end and having an annular synthetic packing mounted adjacent said pressure end and sliding on said wall, said wall having a straight ram stroke limiting passage therein extending transversely through the thickness of the wall and opening at its inlet end into said ram chamber, said passage being traversed by said packing during a maximum power stroke of the ram, said passage having an outlet end opening into said reservoir, said passage having an inlet located adjacent the position occupied by the pressure end of the ram when the ram has moved to substantially the desired termination point for ram travel, said inlet end including an annular corner edge formed in said wall and characterized by being a smooth, rounded shape, said packing being substantially U-shaped with the legs of the U extending substantially parallel to the length of the ram and the U facing the pressure end of the ram, the pressure end of the ram having a reduced diameter portion forming an annular seat coaxial with the ram and defined at the outer end by an integral annular radial shoulder formed on and in the metal of the ram, said synthetic packing being seated on said seat and having an inner diameter normally smaller than the outer diameter of the outer shoulder whereby the packing must be radially enlarged and telescoped over said radial shoulder in order to be assembled on said seat said passage having a short small diameter portion terminating in said inlet end and a large diameter portion terminating in said outlet end, said short small diameter portion being formed by a laser beam directed from the outside toward the inside of the cylinder so that said annular corner edge is characterized by being smooth, rounded, and solidified molten metal.

Claim 6

In a hydraulic ram device having a reservoir, a metal cylinder having a wall and the inside of the cylinder wall defining a ram chamber, a ram in said chamber having a pressure end and having an annular synthetic packing mounted adjacent said pressure end and sliding on said wall, said wall having a straight ram stroke limiting passage therein extending transversely through the thickness of the wall and opening at its inlet end into said ram chamber, said passage being traversed by said packing during a maximum power stroke of the ram, said passage having an outlet end opening into said reservoir, said passage having an inlet located adjacent the position occupied by the pressure end of the ram when the ram has moved to substantially the desired termination point for ram travel, said inlet end including an annular corner edge formed in said wall and characterized by being a smooth, rounded shape, said packing being substantially U-shaped with the legs of the U extending substantially parallel to the length of the ram and the U facing the pressure end of the ram, the pressure end of the ram having a reduced diameter portion forming an annular seat coaxial with the ram and defined at the outer end by an integral annular radial shoulder formed on and in the metal of the ram, said synthetic packing being seated on said seat and having an inner diameter normally smaller than the outer diameter of the outer shoulder whereby the packing must be radially enlarged and telescoped over said radial shoulder in order to be assembled on said seat said passage having a short small diameter portion terminating in said inlet end and a large diameter portion terminating in said outlet end, said short small diameter portion being formed by a laser beam directed from the outside toward the inside of the cylinder so that said annular corner edge is characterized by being smooth, rounded, and solidified molten metal.