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US 5,946,830 AGranted
Concrete crushing tongs
AssigneeSchilling-Ostermeyer Maschinenbau GmbH
InventorThomas Ostermeyer
Life of this patent
Estimating the term…
Abstract
Concrete crushing tongs comprise a frame-shaped first jaw of tongs (1) and a second jaw of tongs (2) which is connected to the first jaw of tongs (1) at a pivot joint (3). The two jaws of tongs (1, 2) each comprise concrete crushing portions (13, 18) with projections (14, 19). The concrete crushing portions (13, 18) of both jaws of tongs (1, 2) each project beyond cutting edges (11, 17) of the two jaws of tongs (1, 2) in a direction towards the corresponding other jaw of tongs (2, 1). Thus, the concrete crushing function of the concrete crushing tongs is separated from the function of cutting the reinforcement.
Claims23
Concrete crushing tongs for cutting concrete parts having a reinforcement, said concrete crushing tongs comprising:
- first and second jaws;
- and
- a pivot joint for hingedly connecting said first and second jaws such that said jaws are movable to open and close relative to each other;
- said first jaw having a frame-shaped first base body, including two side portions, a joint-side portion, and a front portion opposite to said joint-side portion, said side portions, joint-side portion and front portion defining an interior space which is formed to flare out in a direction of movement of said second jaw in a closing movement of said jaws toward each other,
- said first jaw further having a first cutting means comprising a first cutting edge and a first concrete crushing portion projecting beyond said first cutting edge towards said second jaw,
- said second jaw having a second cutting means comprising a second cutting edge and a second concrete crushing portion projecting beyond said second cutting edge towards said first jaw,
- whereby when said pivoting means forces said jaws to close together said first and second crushing portions crush said concrete part before said first and second cutting edges cooperate to cut said reinforcement, and said second jaw enters said interior space to push the crushed concrete material therethrough.
4 more elements
Concrete crushing tongs for cutting concrete parts having a reinforcement, said concrete crushing tongs comprising:
- first and second jaws, said first jaw having a frame-shaped first base body defining an interior space;
- and
- a pivot joint for hingedly connecting said first and second jaws such that said jaws are movable to open and close relative to each other, whereby when said jaws are moved to close said second jaw enters said interior space;
- said first jaw further having a first cutting means comprising a first cutting edge and a first concrete crushing portion projecting beyond said first cutting edge towards said second jaw,
- said second jaw having a second cutting means comprising a second cutting edge and a second concrete crushing portion projecting beyond said second cutting edge towards said first jaw,
- said first concrete crushing portion comprising first projections and first concave portions, each first concave portion being positioned between two adjacent first projections, a further first concave portion being positioned along each of two side portions of said first jaw between said pivot joint and the first projection closest to said pivot joint, and
- said second concrete crushing portion comprising second projections and second concave portions, each second concave portion being positioned between two adjacent second projections, and a further second concave portion being positioned along each of lateral portions of said second jaw between said pivot joint and the second projection closest to said pivot joint,
- wherein a first tangent plane is defined by the axis of said pivot joint and a tangent line from the axis of said pivot joint to said further first concave portion,
- a second tangent plane is defined by the axis of said pivot joint and a tangent line from the axis of said pivot joint to said further second concave portion,
- a first envelope is defined by the axis of said pivot joint and tangent lines from the axis of said pivot joint to said first concave portions,
- a second envelope is defined by the axis of said pivot joint and tangent lines from the axis of said pivot joint to said second concave portions, and
- a distance of at least said first tangent plane to said first envelope in a direction away from said second jaw or said second tangent plane to said second envelope in a direction away from said first jaw increases with increasing distance from said pivot joint.
9 more elements
Concrete crushing tongs for cutting concrete parts having a reinforcement, said concrete crushing tongs comprising:
- first and second jaws, said first jaw having a frame-shaped first base body defining an interior space;
- and
- a pivot joint for hingedly connecting said first and second jaws such that said jaws are movable to open and close relative to each other, whereby when said jaws are moved to close said second jaw enters said interior space;
- said first jaw further having a first cutting means comprising a first cutting edge and a first concrete crushing portion projecting beyond said first cutting edge towards said second jaw,
- said second jaw having a second cutting means comprising a second cutting edge and a second concrete crushing portion projecting beyond said second cutting edge towards said first jaw,
- said first concrete crushing portion comprising first projections and first concave portions, each first concave portion being positioned between two adjacent first projections, a further first concave portion being positioned along each of two side portions of said first jaw between said pivot joint and the first projection closest to said pivot joint, and
- said second concrete crushing portion comprising second projections and second concave portions, each second concave portion being positioned between two adjacent second projections, and a further second concave portion being positioned along each of lateral portions of said second jaw between said pivot joint and the second projection closest to said pivot joint,
- wherein a first envelope is defined by the axis of said pivot joint and tangent lines from the axis of said pivot joint to said first concave portions,
- a second envelope is defined by the axis of said pivot joint and tangent lines from the axis of said pivot joint to said second concave portions, and
- a distance between two adjacent projections of at least said first projections or said second projections, which are adjacent in a direction away from said pivot joint, is essentially inverse proportional to a distance of the point of contact of the respective first or second envelope and the corresponding first or second concave portion positioned between the respective two adjacent first or second projections from said pivot joint.
7 more elements
Dependencies are inferred from the claim text.