FIELD OF THE INVENTION

The invention concerns a device designed for releasing glasses from vehicle bodies, in particular from the bodies of passenger cars, and a method of releasing glasses from vehicle bodies.

BACKGROUND OF THE INVENTION

When dismantling glasses from the vehicle body the following procedure is employed: bonding agent that fixes the glass is slit. The bonding agent is found in the space between the glass and the body or between the glass and the sealing material adhered to the body. The most widely used method of binding agent slitting is the use of a cutting wire that is pulled along the circumference of the glass through the binding agent layer.

The international patent application WO 2004/103748 (A1) discloses a method and a device designed for removing small-sized glasses from the bodies of vehicles. The device comprises fastening elements for fastening to the glass being removed that are fixed to a telescopic body extendible over the entire area of the small-sized glass. The fastening elements are placed on the glass surface. When the operator starts extending the telescopic body, the fastening elements become pressed into the glass frame by which the whole device gets fixed in place. Then a cutting wire is run through the binding agent and fastened to winding elements. The winding elements are arranged on the telescopic body and consist of one movable winding pulley and one immobilised winding pulley. The fastening elements are equipped with guide grooves guiding the cutting wire along the circumference of the glass to prevent its cutting into the body or glass. Among the disadvantages of this solution is the fact that this device is designed only for small, flat glasses, and if the device gets incorrectly fixed by pressing against the glass frame of the vehicle body, the glass frame can be damaged.

The patent document U.S. Pat. No. 7,618,023 (B2) discloses a device for removing glasses from vehicle bodies that includes fastening suction pads arranged on the device body. The device body is also equipped with a movable cutting wire winding pulley and an immobilised cutting wire winding pulley arranged on the device body. The circumference of the suction pads includes a guide groove for the cutting wire. Among the disadvantages of this solution is the fact that the device is not suitable for small glasses and that the device leads the cutting wire at obtuse cutting angles, which results in the inefficient cutting of the binding agent that is prone to cracking, and in some cases it also results in indents in the vehicle body caused by the cutting wire.

The British patent application GB 2 489 835 (A) discloses a device for releasing glasses from the vehicle body that is fitted with a single suction pad for the fastening of the device to the glass with an axially fixed winding pulley. The suction pad is also equipped with a handle and pulleys arranged along the circumference of the suction pad that are fitted with a guide groove for the cutting wire. The drawbacks of this arrangement include the fact that the fixed end of the cutting wire is created on the glass by mere fastening the cutting wire end to the glass, which results in the risk of cutting wire loosening and consequential damage to health or property. The device needs to be combined with another device to cover the entire circumference of the glass without the cutting wire cutting into the vehicle body, or alternatively the device must be equipped with an independent additional cutting wire guide element that is moved during the glass removing in a manner eliminating damage to the vehicle body. Moving the additional guide element extends the time of work and is uncomfortable for the operators and also requires a certain precision of handling.

The European patent application EP 2 540 463 (A1) discloses a device for releasing glasses from vehicle bodies that is equipped with a single suction pad. The suction pad includes an element that can be used as either a handle or an arm for cutting wire guiding. One end of the arm is equipped with a cutting wire winding pulley while the opposite end contains a guide pulley. The fixed end of the wire is fastened to the glass separately. The drawbacks of this solution rest in the fact that the device must be moved on the glass during binding agent cutting and that the fixed end of the cutting wire requires a suction-pad element of its own for successful fastening.

The European patent document EP 2 191 943 (B1) discloses a device equipped with a single suction pad. The suction pad comprises a swivel element that includes a cutting wire reel and two guide pulleys arranged one opposite the other at a small distance with the cutting wire running through the gap between the pulleys towards the reel. The fixed end of the wire is fastened to the suction pad under the swivel element. With gradual wire reeling, the element is swivelled in a manner preventing damage to the vehicle body due to the cutting wire cutting-in. A drawback rests in the fact that the device is not designed for small glasses of vehicles.

The purpose of the invention is to design a device and a method of releasing glasses from vehicle bodies, in particular glasses of passenger vehicles, while eliminating the drawbacks of the known solutions. Other requirements imposed on the invention are as follows: the invention should have such a size and design to make it possible to use it for a wide range of shapes and sizes of glasses, to keep a correct cutting angle of the cutting wire which would protect the cutting wire against breaking and the vehicle body against damage, and to eliminate the necessity to move the device during work on glass releasing with the device holding both ends of the cutting wire and keeping firmly attached in place over the entire period of the method application.

SUMMARY OF THE INVENTION

The set goal has been achieved by designing a device for releasing glasses from vehicle bodies based on the following invention.

The device for releasing glasses from vehicle bodies includes a frame bearing at least one suction pad arranged towards the frame for the device for detachable fastening to the glass being released. In addition, the device comprises at least one guide pulley fixed to the frame and fitted with at least one guide groove to guide the cutting wire and with at least one winding pulley fixed to the frame fitted with at least one winding groove to wind the cutting wire.

The invention is based on the fact that the device includes two winding pulleys and one guide pulley and one guide pulley fitted with two guide grooves, or two guide pulleys with one guide groove having a common central axis. In addition, the pulleys are arranged towards the frame with their central lines intersecting the apices of atriangle where the value of distances between the central lines of the winding pulleys is greater or equals the diameter of the circle circumscribed on the device suction pad projection and the value of the triangle height running from the apex through which the guiding pulley central line is running is greater or equals the diameter of the circle circumscribed on the device suction pad projection. In addition, the winding pulleys are fitted with at least one spacing element for guiding the cutting wire outside the suction pads.

Among the advantages of the device based on the invention is the fact that it is fixed on the glass only once during the whole operation of the glass release. Another advantage is that the acting forces of the cutting wire are transferred to the suction pad through the frame in a manner supporting contact pressure, which means that the suction pad is not prone to coming off due to tilting and the device is completely fixed. Preferably, each end of the cutting wire is fixed in its designated winding pulley. The triangular arrangement of the pulleys and the positioning of the guiding pulley in the main apex allow a safe cutting angle not to be exceeded during the glass cutting off and therefore the cutting wire cannot cut into the vehicle body or glass and also the cutting wire breaks are eliminated. In addition, the spacing elements preferably protect the suction pad against damage in the case of smaller-sized glasses where the ends of the cutting wire would run over the suction pad.

In the preferred embodiment of the device for releasing glasses from vehicle bodies according to this invention the spacing element for guiding the cutting wire of the winding pulley comprises a spacing pulley fitted with a guide groove and the winding pulley and the spacing pulley have a common shaft. The deployment of the spacing pulley reduces tension in the cutting wire, reduces acting friction forces and supports the resolution of forces in a manner requiring smaller pulling forces.

In a preferred embodiment of the device for releasing glasses from vehicle bodies according to the invention the winding pulleys and/or the spacing pulleys are equipped with a single-thrust bearing. The single-thrust bearing prevents the already wound up wire from unwinding.

In a preferred embodiment of the device for releasing glasses from vehicle bodies according to the invention the guide grooves and/or winding grooves are fitted on one side with a cone-shaped leading edge for the cutting wire. With the guide grooves, the cone-shaped leading edge mitigates the risk of cutting wire slipping and the winding groove supports the even distribution of the wire being wound on the winding pulley.

In a preferred embodiment of the device for releasing glasses from vehicle bodies the winding pulleys are provided with an adapter allowing a socket wrench, handle or electric motor to be fitted. An all-purpose adapter allows the winding pulleys to be powered by a variety of tools and drives.

In a preferred embodiment of the device for releasing glasses from vehicle bodies according to the invention the frame is fitted with a handle. Preferably, the handle includes an integrated pump connected to suction pads and/or a control valve connected to suction pads to control the vacuum. Such a manually operated pump or a manually operated valve that controls the device increases the precision required for placing the device on the glass.

In a preferred embodiment of the device for releasing glasses from vehicle bodies according to the invention the frame is substantially planar with top and bottom sides and the suction pads, guide pulley and spacing element are arranged at the bottom side of the frame whereas the winding pulleys with the handle are arranged at the top frame side. The arrangement of the device components increases the extent of the device maneuverability during operation, allows good guiding of the cutting wire and improves occupational safety.

The invention also includes a method of releasing glasses from vehicle bodies that is employed with the device designed according to the aforementioned invention.

The device for the implementation of the method includes at least one suction pad, a guide pulley fitted with two guide grooves for the cutting wire guiding, two winding pulleys provided with winding grooves for the cutting wire winding and a spacing element or a spacing pulley.

The invention is based on the following procedure steps:a) fastening the device to the glass using at least one suction pad,b) arranging the cutting wire along the circumference of the glass on the side that is opposite to the side on which the device has been fastened and pulling through the cutting wire free ends between the glass and the body to the side with the fastened device,c) fastening the free ends of the cutting wire to the winding pulleys while respecting the sides to which the ends of the cutting wire direct; each end of the cutting wire is led around the spacing elements or in the guide grooves of the spacing pulleys and then each end of the cutting wire is led in a designated guide groove of the guide pulley at which the end of the cutting wire are crossed and the free ends of the cutting wire are fastened into the winding grooves of the winding pulleys,d) winding the cutting wire onto the winding pulleys either successively or simultaneously until complete winding up the cutting wire onto the winding pulleys whereby the cutting wire is cutting through between the glass and the vehicle body,e) removing the device from the released glass.

Advantages of this method rest in the fact that the method includes a single fastening of the device to the glass, that the cutting wire never exceeds the cutting angle value of 90°, that it is possible to wind the cutting wire onto both winding pulleys simultaneously and that the glass is released completely without leaving a short unreleased section.

Other advantages of the device for releasing glasses from vehicle bodies include a managed cutting angle that never exceeds the safe limit value whose exceeding would result in cutting into the vehicle body or glass or breaking the cutting wire. Another advantage is the compact design of the device that consists of one unit attached using a single suction pad, that is operable by one hand, no matter whether during fastening or removing the device. The possibility to start winding from both ends of the cutting wire, e.g. using a motor-drive or a socket wrench, without the uncontrollable unwinding of the cutting wire due to the movability of the winding pulleys in one direction only is also preferred.

