FR2742211A1 - Control system for machine tool ensuring that operator wears goggles - Google Patents

Abstract

The protective equipment includes a pair of goggles (1) to which an infrared transmitter is attached, producing a coded signal and deriving its power from a battery or cell. A box (7) containing an infrared receiver is mounted behind the machine tool, and supported on a hinged joint with a flexible arm to allow movement. The machine tool does not have a normal switch, but is turned on and off by means of the control signal from the IR transmitter. The machine may thus be started when the operator wearing the goggles is position adjacent to the machine. The IR transmitter box on the goggles may be provided with its own on-off switch.

Description

 The present invention relates to electronic protective glasses forcing the user of machines as mentioned without limitation the grinders, saws of all kinds, woodworking machines, welding stations causing splashes of material likely to injure the eyes, to wear the said glasses in order to protect oneself.

 The voluntary or involuntary forgetting of wearing safety glasses causes a lot of serious injuries to the level of vision, even loss of complete vision.

 Most glasses are very reliable but do not eliminate the risk of forgetting to wear them and of seriously injuring yourself.

 The device according to the invention overcomes these drawbacks, it is provided with a coded infrared remote control system.

 The telescope is equipped with a transmitter and in order to receive the infrared beam, a box containing the receiver system is fixed on the machine or at its immediate approach. By a small switch fixed on one of the arms of the telescope we activate the step, therefore the functioning of the transmitter. Thus the receiver containing an electronic relay orders the operation of the machine while being in the line of sight of the infrared beam.

The accompanying drawings illustrate the invention:
Figure 1 shows the telescope with its transmitter.

Figure 2 shows the receiver box in perspective with the cover removed.

Figure 3 shows receiver box mounted with an orientation hose.

FIG. 4 represents the assembly of the invention used by a person.

With reference to these drawings, the device comprises a telescope (1) in FIG. 1, its left arm is provided with a housing (5) comprising a battery, an on / off switch (3) and a light-emitting diode ( 4) to signal the start or stop of the transmission. On the right arm is located the box (2) which includes the transmitter printed circuit.
In the middle are placed the two infrared diodes (6) which, according to the action of the switch, emit an infrared beam.

 The drawing in Figure 2 shows the receiver unit (7) with the printed circuit inside (9). Two photodiodes (8) are placed on the front face of the housing (7), the latter receive the emission of the infrared telescope (1) FIG. 1. A transparent plexiglass window (11) protects the photodiodes (8). When said telescope emits, the box comprising the printed circuit (9) actuates by electronic information the relay (10) which, by its contact, operates the machine.

 The drawing in FIG. 3 represents the articulation system of the receiver (7) mounted on a ball joint (13) held by two threaded rings (15). The ball joint (13) allows 360 ° rotation of the housing (7). The latter, housing plus ball joint, are fixed on a hose (12) to allow maximum vertical and longitudinal orientation represented by the dotted lines (16). the assembly is fixed to the machine or to its immediate approach by means of a hook (14).

 By way of example, FIG. 4 shows the assembly of the invention telescope (1) plus receiver box (7), used by a person sharpening a piece of metal. The example includes the telescope emitting the coded infrared beam (f) to a grinder. If for any reason the person leaves the grinding station, the transmitter no longer being in the line of sight of the receiver, the grinding machine stops by releasing the contact of the relay (10) Figure 2.

 The device according to the invention is intended not to forget the wearing of safety glasses, it obliges the person using machines causing projections of material to protect their eyes. The infrared transmission and reception is coded so that no other infrared source can transmit on our receiver (7).

Claims (3)

 1) Safety device intended to protect the eyes during the use of machines capable of causing material splashes during the use thereof Characterized in that it consists of a pair of protective glasses fitted a coded infrared transmitter and a receiver (7) fixed on the machine or at its immediate approach, the said receiver receiving the infrared beam emitted by the telescope so that the machine can only start up if 1 user wears  the said pair of glasses.  2) Safety device according to claim 1 characterized in that 1 emits  infrared sensor consists of a power supply unit (5) provided with a switch (3) and a light-emitting diode (4) serving as a start-up indicator, the said unit being fixed on one of the arms of the telescope and connected to an infrared generator (2) itself arranged on one other arm of the telescope and connected to two photodiodes (6) arranged  axially in the central part of the telescope, the photodiodes having the function of  emit the infrared beam.  3) Safety device according to claim 1 characterized in that the  receiver (7) is connected to a hook (14) fixed to the machine or its immediate surroundings  by means of a hose (12) provided at one of its ends with a ball joint (13)  maintained at the receiver (7) by means of two rings (15), allowing it to be positioned  ment of said receiver.