WO1997030789A1

WO1997030789A1 - Windshield stripper

Info

Publication number: WO1997030789A1
Application number: PCT/US1996/002198
Authority: WO
Inventors: Cynthia Andela; James Andela
Original assignee: Andela Tool and Machine Inc
Current assignee: Andela Tool and Machine Inc
Priority date: 1996-02-20
Filing date: 1996-02-20
Publication date: 1997-08-28
Anticipated expiration: 1998-08-20
Also published as: CA2246692A1

Abstract

A device for recycling automotive windshields (11). An automotive windshield is comprised of two layers of glass and a plastic liner sandwiched in between. The present invention strips the glass from surfaces of the inner plastic liner, comminutes the glass and separates the two substances for recovery. A windshield is fed into the unit (11) by means of dual horizontal feed rollers (14). The windshield then passes over a stationery breaker bar (25) and into the path of a plurality of rotating flexible impactors (26). The force of the rotating impactors (26) on the top surface and the stationery breaker bar (25) on the under surface act together to strip the glass from both sides of the inner plastic liner material. The glass is hammered into small particles the size of gravel and sand while the plastic breaks into much larger fragments. A shaker screen (43) located below the rotating impactors (26) serves to separate the two substances for individual recovery.

Description

WINDSHIELD STRIPPER

FIELD OF THE INVENTION

This invention relates generally to glass recycling machines. In particular, the

present invention is concerned with an apparatus for recycling automotive windshield

glass.

BACKGROUND OF THE INVENTION

In order to efficiently recycle or dispose of an automotive windshield, it is desirable to comminute the glass. Numerous machines have been developed specifically for comminuting empty glass containers. These machines typically include an inlet opening through which the glass containers are inserted and an outlet opening

through which the broken glass fragments and glass dust are ejected. To accomplish the breaking of the glass, these machines usually employ either a crushing apparatus or a hammermill form of breaker apparatus.

For several reasons, existing glass comminuting machines are not well adapted

for the recycling or disposal of automotive windshields. First, such devices are extremely large and are typically only found at large recycling plants. It is not common for an auto shop to have ready access to such a recycling machine. Second, the inlet opening through which the glass enters the comminuting machine is typically of

a dimension which requires that the windshield be broken into smaller pieces prior to its insertion into the opening.

Third, an automotive windshield is comprised of two layers of glass and a plastic liner bonded securely between them. This construction requires that the glass

must first be freed from the plastic liner material before it can be recycled. 2

A fourth problem associated with existing devices employed for the recycling of automotive windshields is that machines that employ a crusher-type apparatus are susceptible to jamming when plastic is inserted into the machine's outlet. The presence of the plastic liner sandwiched between the two layers of glass thus prevents the use of this type of machine.

Finally, after the glass has been freed from the surface of the plastic liner, the

two materials are commingled and must be separated for recovery and recycling.

It is therefore desirable to provide an apparatus that can accommodate a glass sheet of the dimensions of an automotive windshield, and thereby eliminate the need to fragment the sheet prior to beginning the recycling or disposal process.

It is also desirable to provide an apparatus that can strip the two layers of glass off of the inner plastic liner material and then separate the two substances for recovery.

SUMMARY OF THE INVENTION

It is a feature of the present invention to provide a compact automotive

windshield recycling machine that can be used on site, thereby eliminating the need to transport the windshield to an independent recycling plant. Due to its small, compact size, the recycling machine of the present invention can be placed in a typical automotive or glass repair shop without taking up a large amount of valuable work space. The compact, space saving feature will also be of value to a central recycling plant. It is a second feature of the present invention to provide a glass recycling machine having an inlet opening that will accommodate the full width of an automotive windshield, thereby eliminating the need to fragment the sheet of glass prior to utilizing the machine. The sheet of glass is drawn into the machine by dual feed rollers that

each have a shaft on both ends. The shafts extend through openings in the housing side plates and turn in a bearing mounted on an offset. The lower offsets are fixedly mounted to the housing side plates while the upper offsets are slidably attached to the housing side plates, allowing the upper roller to part and accommodate the thickness

of the glass windshield. It is another feature of the present invention to include a stationery breaker bar and an adjustable rotating impactor shaft having a plurality of flexible impactors attached thereto. As the glass sheet is feed into the interior of the machine via the

feed rollers, it passes over the stationery breaker bar and into the line of impact of the rotating flexible impactors. The combination of the stationery breaker bar and the rotating impactors acts to strip the glass from both sides of the inner plastic liner. The glass is hammered into particles the size of fine gravel and sand while the plastic liner

remains in much larger fragments.

It is a further feature of the present invention to provide a shaker screen below the rotating impactor shaft. The much smaller sized glass granules pass through the shaker screen into a glass recovery container below the unit. The larger plastic

fragments remain on the shaker screen and are carried out of the unit and into a separate recovery container. BRIEF DESCRIPTION OF THE DRAWINGS

These and other advantages of the present invention will become more readily

apparent upon reading the following detailed description and upon reference to the drawings in which: FIGURE 1 is an isometric view of a preferred embodiment of the stripper/recycling machine of the present invention.

FIGURE 2 is an isometric view of a preferred embodiment of the stripper/recycling machine of the present invention.

FIGURE 3 is a front view, depicting the belt drive mechanism of a preferred embodiment of the stripper/recycling machine of the present invention.

FIGURE 4 is a first side view of a preferred embodiment of the stripper/recycling machine of the present invention.

FIGURE 5 is a second side view of a preferred embodiment of the stripper/recycling machine of the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS

Referring now specifically to the drawings, there is illustrated an automotive windshield stripper/recycling machine, generally designated as 10, wherein like reference numerals refer to like elements throughout the drawings. As can be seen in FIGURE 1 , the windshield stripper 11 comprises a box-like

housing 12 having a rear mounted infeed table 13. A windshield placed onto infeed table 13 is drawn into the housing 12 by means of two parallel horizontal feed rollers 14. Both feed rollers 14 extend the full width of the housing 12 and have a shaft (not shown) attached at each end. Each shaft extends through an opening in one of the housing side plates 15 and into bearings 16 that are mounted on offsets 17, 17'.

Seals (not shown) are utilized to isolate each of the bearings 16 from abrasive residual glass dust. The lower offsets 17 are fixedly mounted on the outer surface of each of the opposing housing side plates 15. The upper offsets 17' are affixed to mounting plates 18 that are held against the housing side plate 15 by means of two retaining

strips 19 that are securely attached to the housing side plate 15. Thus, the mounting plates 18 can slide freely between housing side plate 15 and retaining strips 19. Mounted on each of the housing side plates 15 proximate the slidable mounting plate 18 is a bracket 20 having screws 21 passing therethrough. Mounted on screws 21 are

heavy duty compression springs 22. Compression springs 22 apply pressure to the offsets 17' such that feed rollers 14 are compressed together. As a windshield is feed into the unit 11 , compression springs 22 allow mounting plates 18 to slide upward between the housing side plate 15 and retaining strips 19 and thereby raise upper

feed roller 14 to accommodate the thickness of the windshield. Compression springs 22 exert enough pressure to securely hold the windshield and feed it into the unit 11 without slippage.

Referring to FIGURE 1 , each of feed rollers 14 are driven directly by a gear reducer and motor assembly 23, 23'. Gear reducer/motor assemblies 23, 23' are mounted on one end of each feed roller shaft. Anti-rotation devices 24, 24' are attached to each gear reducer to prevent rotation movement of the gear reducer/motor assembly 23, 23'. As shown in FIGURE 1, after the windshield enters the unit 11 through feed rollers 14, it passes over stationery breaker bar 25 which extends the full width of the housing 12. Breaker bar 25 is formed of a hardened abrasion resistant material such as steel. As the windshield passes over the edge of breaker bar 25, it comes into the

path of a plurality of rotating flexible impactors 26. The force of the rotating impactors 26 acts to pull the windshield down over breaker bar 25 and to strip the glass off of the inner plastic liner. It is the combination of the stationery breaker bar 25 on the underside and the rotating flexible impactors 26 on the topside of the windshield which acts to strip the glass off of both surfaces of the plastic liner. The glass is hammered into particles the size of fine gravel and sand while the plastic liner remains in much larger fragments.

Referring to FIGURES 1 and 2, it is seen that flexible impactors 26 are mounted on a rotating impactor shaft 27 that extends the full width of housing 12 and out through openings 28 in each housing side plate 15. Rotating impactor shaft 27 turns

in bearings 29 mounted on offsets 30 that are mounted on mounting plates 31. Mounting plates 31 are held securely in place against housing side plate 15 by means of two retaining strips 32. Secured to each housing side plate 15, proximate impactor shaft offsets 30, is an adjustment device 33 which functions to move impactor shaft

27, and consequently, flexible impactors 26, closer to stationery breaker bar 25 as the flexible impactors 26 become shorter with wear over time. As shown, adjustment device 33 can be screws 34 abutting impactor shaft offsets 30. To implement adjustment device 33, the screws are loosened on retaining strips 32, thereby freeing

mounting plate 31 , and as screws 34 are engaged against offsets 30, mounting plates 31 are moved, and consequently, bearings 29, impactor shaft 27 and flexible impactors 26. After flexible impactors 26 have been properly repositioned, retaining strips 32 are then retightened to resecure mounting plate 31 to the housing side plate

15. As seen in FIGURES 2, 4 and 5, opening 28 in housing side plate 15 extends forward to the front edge of housing plate 15. To remove impactor shaft 27 from the unit, as may be required for maintenance, adjustment device 33 is first removed and then retaining strips 32 are loosened, freeing mounting plates 31. Impactor shaft 27 can then be removed out through opening 28 and from the unit. The ease with which impactor shaft 27 can be removed greatly facilitates maintenance and replacement of

flexible impactors 26.

As seen in FIGURES 2, 3 and 5, rotating impactor shaft 27 is driven by motor 35 which is secured to adjustable motor mount 36 on the top surface of housing 12. Power is transferred from motor 35 to impactor shaft 27 by means of a belt drive

system. Bearings and sheaves 37 are mounted on motor drive shaft 38 and impactor shaft 27. Belts 39 encircle the two sheaves 37.

Referring to FIGURE 1 and 2, it is seen that flexible impactors 26 are comprised of a stanchion 40, a link 41 and a hammer 42. To increase the flexibility

of the impactors 26, stanchion 40 and hammer 42 are pivotally attached to opposite ends of link 41. The links 41 and hammers 42 are formed of hardened abrasion resistant steel or other hard abrasion resistant material. Preferably, flexible impactors 26 are securely mounted onto rotating impactor shaft 27 in a spiral pattern, although other balanced manners can be used. As shown in FIGURE 1 and 2, a preferred embodiment of the present invention includes a downwardly slanted shaker screen 43 that is located directly below the rotating flexible impactors 26. As the glass is stripped from the inner plastic liner, it is hammered into particles the size of fine gravel and sand, while the plastic liner is broken into much larger fragments. The glass particles pass through shaker screen 43 into recovery container 44 located below housing 12. The plastic fragments remain on shaker screen 43 and slide down into a second recovery container 45.

As can be seen in FIGURE 1, 2, 4, and 5, infeed guard 46 is mounted on the rear of housing 12, over infeed table 13. Infeed guard 46 protects the operator from the rotating action of feed rollers 14 and from any glass which might pop off the windshield. As the windshield is impacted and pulverized, abrasive glass dust is created. A dust collection device or spraying a fine mist on the windshield as it is fed into the feed rollers can control this residual glass dust. Infeed guard 46 provides a point of attachment for a dust collection unit or a misting device. The embodiments disclosed herein have been discussed for the purpose of familiarizing the reader with the novel aspects of the invention. Although preferred embodiments of the invention have been shown, many changes, modifications and substitutions may be made by one of ordinary skill in the art without necessarily departing from the spirit and scope of the invention as described in the following claims.

Claims

CLAIMSI claim:

1. A device for comminuting an automotive windshield comprising:

a hollow housing; an inlet means providing access to the interior of said housing; a breaker bar fixedly attached within said housing, proximate said inlet means;

and a flail assembly within said housing, proximate said breaker bar.

2. The device of claim 1 , further comprising:

a shaker screen mounted below said rotating flail assembly.

3. The device of claim 1 wherein: said inlet means is a pair of horizontally oriented feed rollers, each of said feed rollers having a shaft extending from each opposing end; said shafts extend through apertures in said housing and into bearings mounted on offsets; and said feed rollers are operatively attached to a drive means.

4. The device of claim 3 wherein said drive means comprises a gear reducer/motor assembly.

5. The device of claim 3, further comprising:

an infeed table mounted to the exterior of said housing adjacent to said horizontally oriented feed rollers; and an infeed guard mounted over said infeed table.

6. The device of claim 3 wherein:

said offsets attached to said shafts of a first feed roller are fixedly attached to the exterior of said housing; said offsets attached to said shafts of a second feed roller are fixedly attached to a mounting plate;

said mounting plate is slidably held against said exterior of said housing by two retaining strips; and said mounting plate, and in turn said second feed roller, is held in a lower position by means of compression springs, mounted above said retaining strips by means of a bracke on the exterior of said housing, said compression screws abutting said offsets corresponding to said second feed roller, and wherein said second feed roller can part to accommodate the thickness of a windshield inserted into said feed

rollers.

7. The device of claim 1 wherein said flail assembly comprises: a rotating impactor shaft wherein each opposing end extends through an aperture in said housing and into a bearing mounted on an offset; a rotator means; a plurality of impactors mounted onto said rotating impactor shaft. 11

8. The device of claim 7 wherein said rotator means is a belt drive system comprising: a motor having a drive shaft; bearings and sheaves mounted onto said drive shaft and said rotating impactor

shaft; and belts encircling said sheaves mounted onto said drive shaft and said rotating impactor shaft.

9. The device of claim 7 wherein said impactors comprise: a stanchion fixedly attached to said impactor shaft; a link pivotally attached to said stanchion; and a hammer pivotally attached to said link.

10. The device of claim 9 wherein said link and said hammer are formed of a hardened abrasion resistant material.

11. The device of claim 10 wherein said hardened abrasion resistant material is hardened abrasion resistant steel.

12. A device for stripping glass from the plastic liner of an automotive windshield comprising: a hollow housing;

a pair of horizontally oriented feed rollers operatively attached to a drive means; a breaker bar fixedly attached within said housing, proximate said horizontally oriented feed rollers; a flail assembly within said housing, proximate said breaker bar, said flail assembly comprising: a rotating impactor shaft;

a rotator means; and

a plurality of impactors mounted onto said rotating impactor shaft.

13. The device of claim 12 wherein:

said drive means is a gear reducer/motor assembly mounted on the exterior of said housing; and said rotator means is a belt drive system comprising: a motor having a drive shaft; bearings and sheaves mounted onto said drive shaft and said rotating impactor shaft; and belts encircling said sheaves mounted onto said drive shaft and said rotating impactor shaft.

14. The device of claim 12 wherein said impators include: a stanchion fixedly attached to said rotating impactor shaft; a link pivotally attached to said stanchion; and a hammer pivotally attached to said link.

15. The device of claim 14 wherein said link and said hammer are formed of a hardened abrasion resistant steel.