FI57015C - SEEKERHETSANORDNING SOM ANSLUTER SIG TILL EN AKTIVERINGSANORDNING FOER ARBETSSLAGET I EN ARBETSMASKIN ELLER DESS ARBETSSORGAN - Google Patents

Description

ΓβΊ (M) ANNOUNCEMENT Γ7ηκ JS® lBJ (11) UTLÄGGNINGSSKRIFT 5 / O 'δ • ^ Λ? § C (45) Ratings issued 1C 15 1930

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Patent · oeh registerstyrelsen '' Amakm utlajd och uti.skrtfMn pubitcand 31.01.80 (32) (33) (31) Requested «toiketi, —Baglrd priorltat (71) (72) Harri Olavi Vaarala, Tapionkatu 21-23 B 31, 33500 Tampere 50,

Suomi-Finland (FI) (7I +) Leitzinger Oy (5 ^) Safety device associated with the work trigger of a work machine or its actuator

The invention relates to a safety device associated with a work shock trigger for a work machine or its actuator, which prevents or stops a work shock when the object to be protected, such as a hand, is in a vulnerable position of the machine or actuator.

In known safety devices, e.g. with clamps, either a light curtain, an automatic feeder, a gate or a two-handed trigger is used to prevent such a trip, whereby it is possible for the user to injure e.g. his hand. However, these known safety devices are not suitable for use, for example, when a workpiece has to be fed to the press or cutter by hand.

On the other hand, German Pat. However, such a safety device cannot be accepted due to its high uncertainty, but rather may be the cause of the accident, as the reflex movement following an electric shock may not always be appropriate and directional, but vice versa.

2 57015

The object of the invention is to provide an improved safety device which is reliable in all situations and which enables e.g. the use of hands when feeding the workpiece into a press or cutter, for example.

To this end, the invention is characterized in that the object to be protected is covered by a protective cover with electrically conductive elements, such as a glove, the electrically conductive elements of which are connected to an electrical voltage which short-circuits a message to the trigger to prevent, stop, or reset its operation.

When the safety device is gloves in cases where it is necessary to hold on to the workpiece to be fed to the machine, according to a preferred embodiment of the invention, the electrically conductive elements are placed on the back of the safety gloves.

One possibility of short-circuiting electrically conductive elements is to ground the machine or its actuator, whereby when the electrically conductive, live elements contact the machine or its actuator, an earth fault is immediately created, which is arranged to cause the required operation of the trigger. In other ways, it is also possible to arrange this operation in such a way that, for example, when a live portion of the safety gloves, such as the back of the palm, touches the machine body, the launch cannot be performed or the ongoing work stroke stops. The control unit belonging to the device is arranged to sense the voltage discharge and, on this basis, to prevent the control command of the tripping device.

The device according to the invention can be arranged to operate in such a way that the contact of the electrically conductive elements is checked in each cycle, e.g. so that the press can be triggered, e.g. As an application, an automatic tripping of the machine or actuator can also be connected to this, so that the tripping takes place whenever the safety gloves (hands) in the danger zone leave this area.

Claims (2)

57015 1. A safety device associated with an impactor for a work machine or its actuator which prevents or stops a work impact when an object to be protected, such as a hand, is exposed to an injured part of the machine or actuator, characterized in that the object to be protected is covered by an electrically conductive cover. an electrical voltage is applied which short-circuits when said elements touch dangerous parts of the actuator or machine, and that the electrically conductive elements are arranged during said short-circuit to send a message to the tripping device to prevent, stop or restore its operation. Safety device according to Claim 1, characterized in that the electrically conductive elements are arranged on the back of the safety gloves.