[0001] This application is a continuation-in-part of my co-pending allowed U.S. Patent Application
Serial No. 479,962 filed February 14, 1990.
BACKGROUND OF THE INVENTION
Field of the Invention:
[0002] This invention is in the field of grinding machines, and more specifically, those
used to grind a beveled surface in a sheet of glass.
Description of the Prior Art:
[0003] Glass beveling at the hands of a master shapes and transforms a transparent substance
into an extraordinary achievement. In years past, polished cuts could only be done
by a master who understood his material and caressed its beauty with careful hands.
Today's masters of the art of beveling glass are few, while the commercial demands
for this product continue to expand. To retain the essence of this craft, and to allow
greater numbers of workers to become skilled in beveling glass, the glass beveling
machine disclosed herein was developed. The glass beveling machine is equally versatile
as a high volume production unit or to make those occasional shapes for custom order
and repairs. The machine fills the unique position of combining the irregular shape
capability and variation of finish of traditional wheels with the accuracy and skill
free effort of straight line bevelers.
[0004] The glass beveling machine disclosed herein allows the operator to quickly move the
sheet to be beveled horizontally across a table and against a downwardly facing grinding
surface. The operator therefore does not have to force the sheet being beveled downwardly
against a grinding wheel as is the case in the beveling device disclosed in U.S. patent
4,322,915 issued to Kindig. It is known to provide a downwardly facing grinding surface
such as shown in U.S. patent 4,053,288 issued to Barron; however, the prior art structures
do not provide for ease and reliability of use. Another glass beveling machine by
Barron is shown in U.S. patent 4,060,938. In many cases, the prior art structures
do not allow the operator to see the surface being ground nor do they allow the operator
to extend the sheet to be ground against the grinding wheel from any position surrounding
the bevel wheel axis of rotation. Likewise, the means for directing lubricant against
the surface being ground impedes or restricts the motion of the sheet to be ground
against the grinding wheel. The liquid lubricant in the machine disclosed herein is
directed upwardly through the drive shaft and then outwardly against the sheet being
beveled. Directing a liquid through a shaft is known such as shown in the U.S. patent
3,609,931 issued to Voorhies. In view of the many limitations of the prior machines,
I have designed and disclose herein a beveling machine having a downwardly facing
grinding surface which allows the operator to direct the sheet being ground against
the wheel at any position surrounding the wheel axis of rotation. In addition, the
machine distributes lubricant against the surface being ground regardless of the location
of the sheet relative to the wheel as the sheet is moved inwardly against the wheel.
[0005] In order to maintain accurate and repeated sizing of the beveled surface, it is necessary
to accurately locate the grinding surface with respect to the table top. In many cases,
this spacing or gap must be changed depending on the sizing of the thickness of the
sheet. The drive train of the machine disclosed herein provides reliable adjustment
means which is easily utilized to mount the grinding wheel on a rotatable drive shaft
facilitating the accurate control of the gap. A number of prior patents have been
granted to allow various items to be secured to a shaft. For example, see U.S. patents
1,719,689 issued to Buehler 3,042,094 issued to Liljeberg, 3,464,164 issued to Blohn,
and 2,526,208 issued to Dowick.
[0006] It is an object of the present invention to provide a new and improved glass beveling
machine.
[0007] A further object of the present invention is to provide a beveling machine which
will accurately control the angle and size of the beveled surface created.
[0008] In addition, it is an object of the present invention to provide a beveling machine
which is relatively easy to use.
[0009] In addition, it is an object of the present invention to provide a glass beveling
machine allowing for high productivity while occupying a minimum space.
[0010] Related objects and advantages of the present invention will be apparent from the
following description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a perspective view of the glass beveling machine.
[0012] FIG. 2 is a fragmentary, vertical cross-section of the grinding head and alternate
embodiment of the associated drive train.
[0013] FIG. 3 is a side view of the arbor for mounting the grinding head.
[0014] FIG. 4 is an enlarged fragmentary, perspective view of the bottom end of the arbor
illustrating the means for securing the arbor to the spindle.
[0015] FIG. 5 is a fragmentary, vertical cross section of the grinding head and preferred
embodiment of the associated drive train.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] Referring now more particularly to FIG. 1, there is shown a beveling machine 10 incorporating
my new invention. The machine consists of a cabinet 11 housing the means for rotating
and controlling a grinding head 12 rotatably mounted above a operating table 13. An
instrument panel 14 is provided for controlling and monitoring the status of the grinding
head 12 and liquid lubricant applied to the grinding surface. An upright wall 15 surrounds
the perimeter of the table 13 retaining the liquid lubricant on the table which is
recirculated to the grinding head.
[0017] A vertical cross-section of the head and alternate embodiment of the associated drive
train is shown in FIG. 2. An electric motor is connected by belt 38 to a pulley wheel
16 fixedly secured to spindle 17. The motor is operable to rotate pulley 16 and spindle
17 about longitudinal axis 18 which extends centrally through the spindle and arbor
19 removably mounted to the spindle and positioning the grinding head 12 above table
13. Spindle 16 is rotatably mounted by conventional bearings 20 and 21 to a spindle
housing 22 in turn fixedly fastened by conventional fasteners 23 to the bottom of
table 13. A pair of lock nuts 80 and 81 are secured to the spindle on the opposite
sides of bearings 20 and 21, thereby preventing longitudinal motion of the spindle
relative to the housing. The top end of spindle 17 is provided with an internally
threaded vertically opening hole 24 into which the externally threaded bottom end
of arbor 19 is mounted.
[0018] Grinding head 12 has a cylindrical configuration with hole 26 extending therethrough.
The hole is enlarged approximately midway along its internal length forming a ledge
27. Arbor 19 (FIG. 3) has a cylindrical ring 28 integrally formed thereon with the
ring having an upwardly facing surface contacting the downwardly facing ledge 27 of
head 12. The top end 30 of arbor 19 is externally threaded and projects through the
top end of head 12 into an internally threaded wheel lock nut 31. Thus, once arbor
19 is threadedly mounted to spindle 17 thereby positioning ring 28 and head 12 the
desired distance above table 13, lock nut 31 is threadedly mounted on to the externally
threaded top end of the arbor thereby holding the head against surface 29 of the arbor
ring 28 and preventing relative longitudinal or rotational motion between head and
arbor 19. A conventional woodruff key 37 is provided in head 12 and arbor 19 to prevent
relative rotational motion between the head and arbor. A plurality of radially extending
holes 33 are provided on lock nut 31 to facilitate the tightening or loosening of
the lock nut relative to the arbor.
[0019] The bottom edge portion of head 12 is beveled forming a grinding surface 34 for use
in roughing, smoothing, and pre-polishing a sheet of material which is extended between
surface 34 and the upwardly facing supporting surface 35 of table 13. Surface 34 is
impregnated with diamond and synthetic materials, and is oriented relative to surface
35 and longitudinal axis 18 the desired angle corresponding to the beveled surface
to be created in the sheet of material extended between the head and table. A variety
of different sizes of grinding heads with corresponding grinding surfaces 34 are therefore
provided to achieve the desired result. Grinding surface 34 extends upwardly from
supporting surface 35 at an acute angle. In one embodiment, surface 34 is at a 15°
angle relative to the supporting surface 35.
[0020] The bottom end 40 (FIG. 3) of arbor 19 is externally threaded to be removably mounted
into the internally threaded top end of spindle 17. An elongated hole 41 extends through
the arbor at an angle perpendicular to axis 18. Approximately 270° of hole 41 as viewed
in FIG. 3 is circular with the upper portion of the hole being slotted forming a slotted
hole 42 also extending through bottom end 40. A slot 43 is cut through the distal
tip portion of bottom end 40 opening into hole 41 and thereby forming two spaced apart
wings or arms 45 and 46 integrally joined at their top ends to the main body of the
arbor. A further slot 44 extends through the arbor from hole 42 upwardly providing
for relief of stress. An enlarged perspective bottom view of arbor 19 is shown in
FIG. 4 illustrating the spaced apart wings 45 and 46 integrally joined at their top
ends 48 to the main body of the arbor. Hole 49 extends centrally through arbor 19
into hole 41. Likewise, hole 49 extends upwardly through the top end of the arbor
and is enlarged at location 49 forming an internally located ledge 50.
[0021] An externally threaded bolt 84 extends through hole 49 with the head of the bolt
resting upon internal ledge 50. The bottom end 53 of the bolt 84 is in meshing engagement
with nut 54 located within hole 41. Nut 54 has an internally threaded hole 55 receiving
the externally threaded bottom end 53 of the bolt. Nut 54 has a cylindrical cross-section
thereby fitting within hole 41 with the opposite ends 56 and 57 of the bolt being
spaced apart a distance less than the outside diameter of arbor 19. By rotating bolt
84, nut 54 is pulled upwardly along axis 18 thereby contacting the upper surface of
hole 41 and forcing wings 45 and 46 outwardly against the internally threaded surface
defining hole 24 of the spindle preventing relative longitudinal or rotational relative
motion between the arbor and spindle. Likewise, rotation of bolt 84 in the opposite
direction allows nut 54 to move downwardly thereby relaxing the arbor wings relative
to the spindle and facilitating loosening of the arbor relative to the spindle.
[0022] Liquid lubricant is ejected upwardly through the spindle exiting between the table
and grinding head. A conventional liquid pump 85 forces the lubricant from a supply
via a nylon hose 60 (FIG. 2) to a coolant coupling 61 in turn connected to the bottom
end 62 of spindle 17. A number of commercially available coolant couplings are available
for coupling the source of liquid to the spindle. For example, one such lubricant
coupling is manufactured by Deublin Company, 1919 Stanley Street, Northbrook, Illinois
60065, under Part No. 11-035-036. Such a coupling is operable at high speeds of approximately
9,000 revolutions per minute (rpm) to connect the source of liquid to the spindle.
[0023] The spindle includes a passage 63 extending therethrough along the longitudinal axis
18 allowing the liquid lubricant to flow upwardly and exiting the spindle via hole
64. The liquid then flows into passage 65 extending between the top end of the spindle
and a ring-shaped housing 66 fixedly secured to table 13 by means of conventional
fasteners 67. The spindle is rotatably received in housing 66 and is sealed thereto
by conventional O-ring seals 68.
[0024] Pump 85 is operable to force the liquid lubricant up through the center of spindle
17 and into passage 65. The top of passage 65 is closed by means of a cylindrical
fence 86 (FIG. 2) which is press fitted to table 13. The top 87 of fence 86 extends
into the hollow interior of head 12 and is provided with a hollow center through which
arbor 19 freely extends. The arbor is spaced inwardly from the fence forming a ring-shaped
cavity 88 allowing the liquid within passage 65 to flow upwardly through passage 88
and into the hollow interior of the grinding head. The liquid lubricant then flows
out of end 87 and downwardly around the outside diameter of the fence exiting between
the table 13 and head 12 thereby wetting the sheet of glass being ground as well as
grinding surface 34. The center portion 89 of the fence is enlarged providing a outwardly
facing projection or stop surface against which the object to be ground will contact,
thereby limiting further inward movement of the object being ground. The bottom edge
of the head is spaced slightly above enlarged portion 89 to facilitate outward flow
of the liquid lubricant. Various drains are provided around the periphery of the table
to collect the liquid lubricant recirculating the same back to pump 85 which in turn
redirects the liquid lubricant upwardly through the spindle.
[0025] In order to operate the grinding machine, the electrical motor is activated causing
pulley wheel 16 and spindle 17 to rotate thereby rotating the grinding head. Simultaneously,
the liquid lubricant is circulated by pump 85 exiting in the gap formed between the
bottom beveled surface 34 and the upwardly facing supporting surface of table 13.
A sheet of material such as glass is then moved inwardly towards the head atop table
13 thereby entering the gap between grinding surface 34 and the upwardly facing surface
of the table causing the head to grind a beveled surface onto the sheet of material.
A variety of controls may be provided to control the operation of the glass beveling
machine. For example, the electric motor may be turned on by a main power "ON" switch
and an indicator provided to indicate rotation of the grinding head. Likewise, a pump
"ON/OFF" switch is provided to allow the liquid lubricant to continuously run during
operation. An indicator may be provided to show whether the flow of lubricant is below
a certain level. A brake switch may also be provided to lock the spindle in place
facilitating the removal of lock nut 31 and head 12. A brake light may be provided
to indicate whether the brake has been activated. A variety of means may be used to
lock the spindle in place including a motor control to lock the output and thereby
lock the spindle. A variety of different types of motors may be used. Best results
have been obtained by utilizing a constant torque output motor thereby allowing multiple
operators to simultaneously bevel sheets with the same beveling head applying additional
load on the spindle. Supplemental light may be provided by a quartz light with suitable
"ON/OFF" controls located on the control panel. A speed control may also be provided
to control the rotational speed of the spindle.
[0026] The gap existing between the beveling head and the top of the table will depend on
the thickness of the sheet extended therebetween as well as the amount of wear occurring
on the grinding surface. Once the desired gap distance has been determined, the arbor
with head is threaded downwardly onto the spindle with lock nut 31 tightened. Once
the arbor has been threaded on the spindle a sufficient amount to create the desired
gap, threaded member 84 may be tightened locking the arbor to the spindle.
[0027] FIG. 5 shows a fragmentary, vertical cross section of the grinding head and preferred
embodiment of the associated drive train as compared to the alternate embodiment of
the drive train shown in FIGS. 2 through 4. That portion of the drive train which
extends beneath a table 13 of the two embodiments is identical with the exception
that in FIG. 5 the lubricant passage 63 extends through the entire length of spindle
17 opening within grinding head 12 via outlet 100. As a result, outlet 64 (FIG. 2)
is not provided in the preferred embodiment of FIG. 5 and thus the lubricant does
not exit the spindle and flow upwardly through a passage existing between the spindle
and cylindrical fence 86. The structure for securing the grinding head to the spindle
and for adjustment of the gap between the grinding head and table top is different
for the embodiment shown in FIG. 5 as compared to FIGS. 2 through 4. As a result,
threaded hole 24 (FIG. 2) is not provided in the spindle shown in FIG. 5.
[0028] Spindle 17 (FIG. 5) extends upwardly through fence 86 which is identical to the fence
previously described for the embodiment of FIGS. 2 through 4. The top end 101 of spindle
17 is cylindrical and includes external threads in meshing engagement with the hollow
threads surrounding the hollow interior of cylindrical arbor 102. A ring 103 is integrally
provided at the bottom end of arbor 102 and extends outwardly forming a ledge 104
upon which cylindrical grinding wheel 12 is supported. An internally threaded wheel
nut 31 rests atop grinding wheel 12 and is in meshing engagement with the external
threads provided on the top end of arbor 102. Thus, wheel nut 31 may be rotated downwardly
along the axis of the spindle thereby forcing grinding wheel 12 against ledge 104
and securing the grinding wheel and arbor together. The grinding wheel and arbor may
then be rotated about the longitudinal axis of the spindle thereby advancing the arbor
and wheel upwardly or downwardly along the length of the top end of the spindle so
as to control the gap existing between the downwardly facing grinding surface 34 of
the grinding head and the upwardly facing surface of table 13.
[0029] The top end 101 of the spindle is split into a plurality of expandable portions.
For example, in the vertical cross section shown in FIG. 5, the top end includes opposite
portions 105 and 106 which are separated by a downwardly extending hole 107. The bottom
end 108 of hole 107 is internally threaded whereas the top end 109 is flared outwardly.
An expander bolt 110 is threadedly received in the hole and includes a cone shaped
top end 111 moveable against flared end 109 to move opposite portions 105 and 106
against the internal threads of arbor 102 locking the arbor to the spindle. An arbor
wrench 113 includes a downwardly facing cavity complimentary in shape to receive the
upwardly extending projection 112 of the expander bolt 110. For example, projection
112 may take the form of a triangle complimentary in shape to a triangular shaped
cavity of arbor wrench 113. The arbor wrench may be used to tighten or loosen the
expander bolt thereby to tighten or loosen the spindle to the arbor and head.
[0030] A skirt 114 surrounds the upwardly extending cylindrical top end 87 of skirt 86.
The skirt is secured to spindle 17 by means of a plurality of set screws 115. The
spindle has a reduced diametered cylindrical portion 119 located above fence 86 and
is further reduced in diameter at the threaded top end 101. The top end 116 of skirt
114 extends inwardly above the main body of the spindle but includes a cylindrical
hole extending through top end 116 to allow the skirt to be moved upwardly past cylindrical
portion 119 in the event the skirt is to be disassembled from the spindle. The bottom
end 117 of the skirt extends outwardly immediately above the ring shaped center portion
89 of the skirt. The lubricant outlet 100 is located in portion 119 of the spindle
immediately above the top end 116 of the skirt. The skirt is operable to direct the
lubricant exiting outlet 100 outwardly across the top end 116 of the skirt and then
downwardly between the skirt and the grinding head exiting in the gap between the
grinding head and the table top. The skirt limits flow of lubricant and foreign material
in a reverse direction toward the spindle thereby limiting maintenance problems with
the rotating spindle. Fence 86 is also operable to prevent the spindle from wobbling
during rotation. The outside diameter of the spindle is ground to within 0.0002 inches
of the inside diameter of fence 86. As a result, fence 86 is advantageous in that
it prevents foreign material from entering between the spindle and fence. Likewise,
a ring shaped seal 120 is fixedly mounted to housing 22 and includes an upwardly extending
wall 121 surrounding nut 81. A flinger ring seal 122 is sealingly mounted atop nut
81 and projects inwardly of wall 121 thereby limiting flow of liquid toward bearing
21.
1. A bevel tool comprising:
a table with an upper surface;
electric motor means with a rotatable shaft extending upwardly from said motor
means toward said upper surface, said shaft being immovable in a direction along its
longitudinal axis;
a grinding head having a cavity with said axis extending therethrough being removably
mounted to said shaft and having a grinding surface positioned above and facing downwardly
toward said upper surface forming a gap into which a sheet of material to be ground
may be moved;
adjustment means operable to move said head in a vertical direction along said
axis while said motor means remains stationary to space said grinding surface a predetermined
distance apart from said upper surface to grind a beveled surface into a sheet of
material extended between said upper surface and said grinding head;
liquid pump means having an outlet within said grinding head operable to direct
liquid through said gap to lubricate said grinding surface as said head rotates and
grinds said sheet of material;
stop means including a curved wall fixedly mounted to said table beneath said head,
said curved wall is immovable and has a stationary stop surface contactable by said
sheet of material as said sheet is moved beneath said head, said stop means further
includes an upper wall above said curved wall with said upper wall extending into
said cavity of said head, said shaft extending adjacent said upper wall and including
a hollow center in fluid communication with said liquid pump means which is operable
to direct lubricant upwardly through said center into said cavity and downwardly adjacent
said upper wall and then through said gap; and,
lubrication distribution and sealing means mounted to said shaft and extending
downwardly toward said gap from a location between said outlet and above said upper
wall, said lubrication distribution and sealing means both operable to distribute
said lubricant downwardly around said axis and to limit reverse flow of said lubricant
and foreign material toward and between said shaft and said upper wall.
2. The bevel tool of claim 1 wherein:
said adjustment means includes an arbor mounted to said shaft, said arbor includes
an internally threaded passage, an external threaded cylindrical outer surface and
an outwardly extending ledge beneath said threaded cylindrical outer surface atop
of which said head is supported,
said shaft includes a threaded top end extending through said threaded passage,
said adjustment means further includes a fastening device with an internal threaded
hole in meshing engagement with said external threaded cylindrical outer surface securing
said head to said arbor and locking said head atop said ledge, said arbor is adjustable
along said axis to move said ledge with said head and said fastening device to and
from said table to size said gap.
3. The bevel tool of claim 1 wherein:
said lubrication distribution and sealing means includes a skirt mounted to said
shaft and surrounding said upper wall of said stop means with said skirt extending
from beneath said outlet to above said curved wall limiting flow of material from
external of said skirt toward said shaft.
4. A glass beveling machine comprising:
a frame with a supporting surface to support a sheet of glass to be beveled;
a source of rotary power including a hollow output shaft with an outlet and having
a longitudinal axis extending through said supporting surface with said shaft being
rotatable on said axis but fixed and non-adjustable in position along the length of
said axis relative to said supporting surface;
a grinding head mounted to said shaft and rotatable therewith, said head being
spaced apart from said supporting surface forming a gap with said head including a
grinding surface facing downwardly toward said supporting surface to contact and grind
said sheet forming a beveled surface as said sheet is extended into said gap;
stop means between said head and said supporting surface operable to limit travel
of said sheet, said stop means includes a stop wall fixedly mounted to said frame
beneath said head, said stop wall is immovable and has a curved stationary stop surface
contactable by said sheet as said sheet is moved into said gap, said stop means including
a passage extending therethrough with said shaft extending through said passage into
said grinding head;
lubrication means including a source of pressurized liquid operable to force liquid
upwardly through said hollow output shaft into said grinding head and then exiting
said head through said gap wetting said sheet of glass;
lubrication distribution and sealing means mounted to said shaft and extending
downwardly toward said gap from a location between said outlet and above said stop
wall, said lubrication distribution and sealing means both operable to distribute
said lubricant downwardly around said axis and to limit reverse flow of said lubricant
and foreign material toward and between said shaft and said stop wall; and,
first means connecting said head to said shaft and operable to adjustably control
the size of said gap facilitating receipt of a different thickness of said sheet.
5. The glass beveling machine of claim 4 wherein:
said stop means includes an upwardly extending wall surrounding said shaft and
extending from said frame to said outlet; and,
said lubrication distribution and sealing means includes
a skirt mounted to said shaft and surrounding said upwardly extending wall limiting
flow of liquid from external of said skirt to said shaft.
6. The glass beveling machine of claim 5 wherein:
said first means includes an arbor threadedly mounted directly to said shaft, said
arbor has an outwardly extending ledge upon which said grinding head is supported
and includes an upper externally threaded portion, said first means includes a internally
threaded fastener threadedly mounted directly to said portion securing said head onto
said ledge and allowing said arbor, head and fastener to be adjusted along said shaft,
said shaft has a split top end forming expandable portions, said first means further
includes an expander fastener extendable into said top end to expand said portions
against said arbor securing said arbor to said shaft.
7. The glass beveling machine of claim 6 wherein:
said outlet is in fluid communication with said source of pressurized liquid and
positioned within said grinding head and above said skirt with said liquid exiting
said outlet flowing outwardly atop said skirt and downwardly through said grinding
head exiting same via said gap.