how to make a put | patch request in laravel?

I have the following function that makes an ajax call to update data in my table:

$("#editar").click(function(){
    if($idfila!=null){
        ruta=url_base+"/patron/"+$idfila;
        var formData = new FormData($("#formulario_datos")[0]);
        formData.append("_token",'{{csrf_token()}}');
        tipo='PATCH';
        myajax(ruta,tipo,formData,function(resp,t){
            if(t=='success'){
                toastr.success(resp.msn);
                limpiar();
                $("#table-contenido").append($html);
                $('.datatables').DataTable();
            }else{
                toastr.error(resp.msn);
                toastr.error(resp.responseJSON.message);
            }
        });
    }else{
        toastr.warning("Seleccione un elemento primero");
    }
    botones(false,true,true,true,true);
});

The myajax function is as follows:

function myajax(url,tipo,datos,callback){
    $.ajax({
        url: url,
        type: tipo,
        data: datos,
        contentType:false,
        processData:false,
        success:function(data){
            callback(data,'success');
        },
        error:function(error){
            callback(error,'error');
        }
    });
}

and my form is as follows:

<form method="POST"  id="formulario_datos"  accept-charset="UTF-8">
    {{csrf_field()}}
    <div class="form-group">
        {!!Form::label('nombre','NOMBRE: ', ['class'=>'col-sm-3 col-md-3 col-lg-3 control-label input-sm'])!!} 
        <div class="col-sm-9 col-md-9 col-lg-9">
            {!!Form::text('nombre',null, ['id'=>'nombre', 'class'=>'input-sm', 'required' => 'required','disabled'=>'true'])!!}
        </div>
    </div>
    <div class="form-group">
        {!!Form::label('SIMBOLO','SIMBOLO: ', ['class'=>'col-sm-3 col-md-3 col-lg-3 control-label input-sm'])!!} 
        <div class="col-sm-9 col-md-9 col-lg-9">
            {!!Form::text('simbolo',null, ['id'=>'simbolo', 'class'=>'input-sm', 'required' => 'required','disabled'=>'true'])!!}
        </div>
    </div>
    <div class="form-group">
        @include("buttons")
    </div>
</form>

When I try to update the data, that is, make the call ajax , the following error returns:

  

PATCH link 419 (unknown status)

entering clearly the error I found:

  

exception: "Symfony \ Component \ HttpKernel \ Exception \ HttpException"
  file: "C: \ xampp \ htdocs \ SalesLight \ vendor \ laravel \ framework \ src \ Illuminate \ Foundation \ Exceptions \ Handler.php"
  line: 203
  message: ""

I have read other cases in which they say that they would lack the _token but if they look at my form I have it included.