Spring grinding machines

Claim 2

In a machine for grinding the extremities of helicoid springs, in combination, a detachable circular magazine-plate having peripheric holes to receive the springs, a pair of grindstones placed facing one another and one either side of said magazine-plate so that all the springs being supported are subjected simultaneously to the action of said grindstones and, for operating of each of said grindstones, a fixed table, a carriage moveable in translation on said table, bearings on said carriage, a hollow shaft in these bearings, said shaft having its axis parallel to the direction of movement of said carriage and carrying at one of its extremities the corresponding grindstone, an opening in said table, a bracket under said carriage extending beyond said opening to support an electric motor to drive said hollow shaft in rotation, a second bracket under said carriage extending in said opening, a hydraulic jack in said opening having one extremity connected to said table while its other extremity is connected to said second bracket, a stop movable according to a mathematical law against which said carriage bears during its advance and means to drive the magazine-plate in rotation independently of said grindstones and to ensure its centering and its retention.

Claim 3

In a machine for grinding the extremities of helicoid springs, in comBination, a removable circular magazine-plate having peripheric holes to receive the springs, a pair of grindstones placed facing one another and one either side of the magazine-plate so that all the springs being supported are subjected simultaneously to the action of said grindstones and, for operating each of said grindstones, a fixed table, a carriage guided in translation on said table, bearings on said carriage, a hollow shaft in said bearings, said hollow shaft having its axis parallel to the direction of movement of said carriage and carrying at one of its extremities the corresponding grindstone, an opening in said table, a bracket under said carriage extending beyond said opening to support an electric motor to drive said hollow shaft in rotation, a second bracket under said carriage extending in said opening, a hydraulic jack in said opening having one end connected to said table while its other end is connected to said second bracket, a stop mobile according to a mathematical law against which said carriage bears during its advance, a shaft moveable axially and in rotation inside said hollow shaft whose extremities extend beyond those of the hollow shaft and whose axis is parallel to that of said hollow shaft and means at one of the extremities of said shaft to ensure simultaneously the retention, centering and driving of said magazine-plate and means at the other extremity of said shaft to control its axial movement and, on the other hand, to drive it in rotation.

Claim 4

In a machine for grinding the extremities of helicoid springs, in comBination, a removable circular magazine-plate having peripheric holes to receive the springs, a pair of grindstones placed facing one another and one either side of the magazine-plate so that all the springs being supported are subjected simultaneously to the action of said grindstones and, for operating each of said grindstones, a fixed table, a carriage guided in translation on said table, bearings on said carriage, a hollow shaft in said bearings, said hollow shaft having its axis parallel to the direction of movement of said carriage and carrying at one of its extremities the corresponding grindstone, an opening in said table, a bracket under said carriage extending beyond said opening to support an electric motor to drive said hollow shaft in rotation, a second bracket under said carriage extending in said opening, a hydraulic jack in said opening having one end connected to said table while its other end is connected to said second bracket, a stop mobile according to a mathematical law against which said carriage bears during its advance, a shaft moveable axially and in rotation inside said hollow shaft whose extremities extend beyond those of the hollow shaft and whose axis is parallel to that of said hollow shaft and means at one of the extremities of said shaft to ensure simultaneously the retention, centering and driving of said magazine-plate and means at the other extremity of said shaft to control its axial movement and, on the other hand, to drive it in rotation.

Claim 5

In a machine for grinding helicoid springs according to claim 2 in which the movable stop to limit the advance of the carriage is constituted by a rotary cam against the periphery of which said carriage bears.

Claim 6

In a machine for grinding helicoid springs according to claim 2 in which the movable stop to limit the advance of the carriage is constituted by a cam, with variable speed of rotation, against the periphery of which said carriage bears.

Claim 7

In a machine for grinding helicoid springs according to claim 2 in which the movable stop to limit the advance of the carriage is constituted by a rotary cam making one complete revolution per grinding cycle.