TOOL FOR APPLYING GLASS INSULATING STRIPS

Abstract: A tool (2) for applying insulating strip (3) such as SWIGGLE STRIP™ used to seal double-paned glass is dis­ closed. The tool (2) has a guide (8) which slides along the edge (5) of the pane (1) and rollers (10,11) which guide the strip (3) through the tool (2) and press it against the surface (4) of the pane (1).

Description: The invention relates to a tool for applying the insulating strip which separates the two panes of glass in double-glazed glass. The manufacture of double-glazed insulating glass for use in residential windows and the like requires the use of sealed spacers along the edges of the glass between the two panes to maintain the separation, and a desiccant to prevent the condensation of moisture between the two panes. A successful form of insulating strip has been a product sold by Tremco Ltd. under the trade mark SWIGGLE STRIP. This form of insulating strip combines the spacer, sealant and desiccant in one strip. It is an extruded butyl-based thermo-plastic strip which contains a corrugated aluminum spacer and a desiccant. The strip is rectangular in cross-section, and is sold in a number of standard sizes from about 6.3 mm x 6.3mm (¼" x ¼") to about 6.3mm x 9.5mm (¼" x 5/8"). It is sold in a continuous roll on a paper tape backing. The insulating strip, sometimes referred to simply as "strip" has been found to be a convenient product in the manufacturing of double-glazed windows. The product at room temperature has considerable adhesive properties. In the past it has been applied by hand, by rolling the strip off the roll, aligning it along the edge of the glass by hand and pressing the strip down to adhere it to the glass. Once the strip has been applied around the entire perimeter of the first pane of glass, the second pane is placed on top of the strip, and the entire unit is heated to bond the strip to the glass, and the two panes are pressed together. This application by hand is a time-consuming procedure, and in the past it has taken approximately seven minutes for two pieces of glass to be joined into a double-paned unit from washing to the stage where the glass is ready to be installed on a frame. German Patent document DE-U-8600068 describes tool for applying a flexible thick adhesive strip to an upper planar surface of an article having an outer edge perpendicular to the upper surface. The tool comprises a tool body provided with an upper handle portion and having a lower surface; a tool guide means attached to the body and extending below the lower surface; the tool guide means having an inwardly-facing guiding edge for sliding contact with the perpendicular outer edge of the article. The tool further comprises a strip guide means connected to the body and mounted adjacent to the guiding edge of the tool guide means for guiding the placement of the strip on said planar surface. The lower surface of the body and the strip guide means form a passageway parallel to the guiding edge of the tool guide means which is open downwardly and at each end, whereby the strip may pass between the lower surface of the body and the upper planar surface. The strip guide means may comprise two parallel roller means laterally spaced apart to form a space between them having a width slightly greater than the width of the strip, the roller means being mounted for rotation about axes perpendicular to the upper planar surface and parallel to the perpendicular edge when the tool is in operation. The tool of the prior art is supported from a table upon which the article is positioned. A disadvantage of this approach is that the vertical spacing between the strip guide means and the surface of the article will vary according to the thickness of the article. The invention as it is claimed overcomes this drawback by providing the lower surface of the tool with a bearing portion for free sliding contact with the upper planar surface of the article whereby the tool may be supported from the upper planar surface, the strip guide means locating intermediate the bearing portion and the grinding edge. Suitably the bearing portion of the lower surface of the body comprises at least two rollers each of which is mounted for rotation in the body about an axis of rotation parallel to the planar surface and perpendicular to the perpendicular edge of the upper planar surface of the article and spaced apart along the length of the tool. Desirably, the strip guide means comprises a polytetrafluoroethylene surface. A preferred construction of the improved tool of the invention is described in detail below with reference to the accompany drawings wherein: Figure 1 is a perspective view of the tool of the invention in position on a pane of glass for applying an insulating strip; Figure 2 is a view of the invention in direction A of Figure 1; Figure 3 is a bottom view of the invention; Figure 4 is a left side view of the invention; and Figure 5 is a right side view of the invention. Referring to Figure 1, a pane of glass is designated as 1, the tool of the invention as 2 and the insulating strip as 3, preferably a SWIGGLE STRIP. The pane of glass is laid horizontally for applying the SWIGGLE STRIP around the edges of the pane. Subsequently, a second pane of glass will be laid on top of the insulating strip 3 and the sandwich of glass heated and pressed to seal the insulating strips 3 to the glass. The pane 1 has a planar top surface 4 and a perpendicular edge 5. Referring to Figures 1 through 5, the tool 2 has a handle portion 6 formed on the tool body 7 contoured and shaped to receive the hand of the worker. A guide 8 is secured to the body of the tool by screws 9 (shown in dotted outline). Mounted on screws 9 for rotation are two rollers 10. A second pair of rollers 11 is secured to the body 7 of the tool by screws 12 (shown in dotted outline). Rollers 10 and 11 are preferably of TEFLON* (trademark of duPont for polytetrafluoroethylene non-stick material or similar low-friction material to prevent sticking to the insulating strip 3. They are mounted in parallel pairs, and single pair would also function, as would more than two pairs. The rollers 10 and 11 form a passage 13 beneath body portion 7 which is slightly wider than the insulating strip 3. Guide 8 may also be of TEFLON low-friction material or similar material. The inner edge 14 of guide 8 is flat to slide along the vertical edge 5 of the pane of glass. Rollers 10 are positioned so that the inner circumference of roller 10 is slightly inward from the edge 14 to provide a small space 15, on the other of 1/16th of an inch, between the edge 5 of the glass and the edge of the insulating strip 3. A further pair of axially spaced apart rollers, which also may be made of low-friction material for reduced friction, is shown at 16. Rollers 16 are mounted between lower extensions 17 of the body portion 7 on the lateral side of rollers 10,11 opposed to guide 8. Rollers 16 rotate on a screw 18 (shown in dotted outline) which secures the rollers in position. The lower edge of rollers 16 and 10 extend slightly below the lower edge or rollers 11 so that the tool when sliding across the plate of glass rides predominantly on the rollers 16, and may also slide on a portion of the lower edge of roller 10, but not on the lower edge of roller 11. An additional roller 20, is shown in Figure 3 and in dotted outline in Figures 2, 4 and 5. Roller 20 is secured in a cavity in the body portion 7 by screw 22 (shown in dotted outline). The lower edge of roller 20 is positioned so that it presses down slightly on the top edge of the strip 3 when the strip is applied using the tool. In operation, the starting end of the line of the strip 3 is laid in position on the surface 4 of the glass adjacent edge 5, and tool 2 is placed over the strip 3 so that the strip passes along passageway 13, with edge 14 of the guide 8 bearing against edge 5, and the lower surface of roller 16 also bearing on surface 4 of the pane of glass. In this position roller 20 presses down slightly on the top surface of the strip 3. The tool is then drawn along the pane of glass, pressing guide 8 against edge 5 and roller 16 down on the top surface 4 of the pane. In this manner, a certain amount of pressure is placed on the strip 3 sufficient to adhere it to the top of the pane of glass, and rollers 10 and 11 guide the strip to the proper location in a straight line adjacent to the edge of the pane. When the tool reaches a corner of the glass, it is raised, the strip 3 is turned 90 degrees, the tool is placed in position again on the next perpendicular edge, and the operation is continued. As will be apparent to those skilled in the art, various modifications and adaptations of the tool above-described are possible without departing from the spirit of the invention, the scope of which is defined in the appended claims. The body portion of the tool may be formed of wood, plastic or any other suitable material. While TEFLON low-friction material has been specified for the rollers and guide 8, other materials having a low co-efficient of friction will be suitable, as will be apparent to those skilled in the art. Similarly, while screws have been shown to mount the various rollers in the tool, other means of mounting the rollers for rotation in their respective positions will be apparent. Similarly, the same results may be achieved using different numbers and configurations of rollers, or stationary sliding surfaces may be substituted for rollers.

Claims: A tool (2) for applying a flexible thick adhesive strip (3) to an upper planar surface (4) of an article having an outer edge (5) perpendicular to the upper surface, said tool comprising: a tool body (7) provided with an upper handle portion (6) and having a lower surface; tool guide means (8) attached to said body and extending below said lower surface, having an inwardly-facing guiding edge (14) for sliding contact with the perpendicular outer edge of said article; strip guide means connected to said body and mounted adjacent to said guiding edge of said tool guide means for guiding the placement of said strip on said planar surface; said lower surface of said body and said strip guide means forming a passageway (13) parallel to said guiding edge of said tool guide means and opening downwardly and open at either end, whereby said strip may pass between said lower surface of said body and said upper planar surface; said strip guide means comprising two parallel roller means (10) (11) laterally spaced apart to form a space between them having a width slightly greater than the width of said strip, said roller means being mounted for rotation about axes perpendicular to said upper planar surface and parallel to said perpendicular edge when the tool is in operation; characterized wherein: said lower surface includes a bearing portion (16) for free sliding contact with said upper planar surface of said article to support said tool from said upper planar surface; and wherein said strip guide means locates intermediate said bearing portion and said guiding edge. The tool of Claim 1, wherein said bearing portion of said lower surface of said body comprises at least two rollers (16) each of which is mounted for rotation in said body about an axis of rotation parallel to said planar surface and perpendicular to said perpendicular edge of said upper planar surface of said article and spaced apart along the length of said tool. The tool of claim 1 or 2 wherein said strip guide means comprises a polytetrafluoroethylene surface. The tool of claim 1 or 2 wherein said edge of said tool guide means forms a straight line. The tool of claim 1 or 2 further comprising roller means (20) mounted in said body above said passageway for rotation about an axis of rotation parallel to said planar surface and positioned to contact the upper surface of said strip. The tool of claim 1 or 2 wherein the article contacting surface of said bearing portion and the lower edge of that one of said parallel roller means which is closest to said tool guide means are contained in an plane locating below the lower surface of the other of the strip guide roller means. The tool of claim 1 or 2 wherein each said roller means comprising said strip guide means comprises first and second axially spaced apart pairs of rollers.

Inventors: KOLFF, JOHN CORNELIS
Applicants: TREMCO LTD.
Application year: 1988
Main classification: E06B3
IPC codes: B25B33, E06B3, B65H37, B29C65