U.S. patent number 3,921,244 [Application Number 05/406,517] was granted by the patent office on 1975-11-25 for floor buffer.
Invention is credited to William George Chappius, Loring Ferdinand Warren.
United States Patent |
3,921,244 |
Warren , et al. |
November 25, 1975 |
Floor buffer
Abstract
An improved floor buffer for operator directed polishing of a
floor is disclosed. A carriage disposed substantially horizontal to
the floor has a lower surface exposed to the floor and an upper
surface exposed away from the floor. A handle is attached to one
end of the carriage. The handle extends angularly upward and away
from the carriage toward the operator overlying an axis extending
longitudinally of and from the carriage. At least two wheels are
rotatably mounted to the carriage. These wheels are mounted along
an axis extending transverse of or across the carriage
substantially normal to the longitudinal axis of the carriage. The
axis about which the wheels rotate divides the carriage into a
forward portion and a rearward portion. A clockwise rotating buffer
is rotatably mounted about a vertical axis preferably displaced to
the right of the longitudinal axis of the carriage at the forward
portion of the carriage and extends below the lower surface of the
carriage to confront the floor. The buffer extends a distance below
the lower surface of the carriage which is substantially the same
as the distance of the lowest point of the wheels below the
carriage. Downward and upward rotation of the rearward portion of
the carriage by correspondent handle movement produces
correspondent upward and downward confrontation of the buffer to
the floor. A butane powered engine is mounted to the upper surface
of the carriage. Power is transmitted from the butane engine to
rotate the buffer. The power transmission includes a centrifugal
clutch and belt drive for permitting the buffer to rotate or not
rotate responsive to the speed of the motor.
Inventors: |
Warren; Loring Ferdinand
(Pittsburg, CA), Chappius; William George (Concord, CA) |
Family
ID: |
23608321 |
Appl.
No.: |
05/406,517 |
Filed: |
October 15, 1973 |
Current U.S.
Class: |
15/98; 15/49.1;
451/353 |
Current CPC
Class: |
A47L
11/16 (20130101); A47L 11/4072 (20130101); A47L
11/4091 (20130101); A47L 11/40 (20130101); A47L
11/4075 (20130101); A47L 11/4069 (20130101); A47L
11/4038 (20130101); A47L 11/4055 (20130101) |
Current International
Class: |
A47L
11/00 (20060101); A47L 11/16 (20060101); A47L
011/162 () |
Field of
Search: |
;15/49R,49C,5R,5C,51,52,98,385 ;51/177 ;125/38 ;123/27 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Roberts; Edward L.
Attorney, Agent or Firm: Townsend and Townsend
Claims
We claim:
1. An improved floor buffer for operator directed polishing of a
floor comprising: a carriage disposed substantially horizontally to
said floor having a lower surface exposed to said floor and an
upper surface exposed away from said floor; a handle attached to
said carriage at the end of said carriage extending angularly
upward and away from said carriage toward said operator overlying a
longitudinal axis along said carriage; at least two wheels
rotatably mounted to said carriage along an axis transverse of said
carriage substantially normal to the longitudinal axis of said
handle, said axis along which said wheels are mounted dividing said
carriage into a forward portion and a rearward portion; a buffer
mounted to said carriage for rotation about a vertical axis at said
forward portion and extending below said lower surface to confront
said floor, said buffer extending a distance below said lower
surface of said carriage which is substantially the same as the
distance of the lowest point of said wheels below said carriage
whereby downward and upward rotation of the rearward portion of
said carriage by said handle produces correspondent upward and
downward confrontation of said buffer to said floor, said buffer
being displaced to the right of said longitudinal axis as viewed
from positions overlying said buffer and said floor, and said
buffer rotates clockwise as viewed from positions overlying said
buffer and said floor; a butane powered engine mounted to said
carriage; means for transmitting power from said butane powered
engine to said buffer, said power transmission means including a
centrifugal clutch for permitting said buffer when in contact with
said floor to not rotate at low operating speeds of said engine, to
rotate at high operating speeds of said engine, and to operate at
adjustable speeds between said low operating speed and said high
operating speed of said engine.
2. An improved floor buffer for operator directed polishing of a
floor comprising: a carriage disposed substantially horizontally to
said floor having a lower surface exposed to said floor and an
upper surface exposed away from said floor; a handle attached to
said carriage at the end of said carriage extending angularly
upward and away from said carriage toward said operator overlying a
longitudinal axis along said carriage; at least two wheels
rotatably mounted to said carriage along an axis transverse of said
carriage substantially normal to the longitudinal axis of said
handle, said axis along which said wheels are mounted dividing said
carriage into a forward portion and a rearward portion; a buffer
mounted to said carriage for rotation about a vertical axis at said
forward portion and extending below said lower surface to confront
said floor, said buffer extending a distance below said lower
surface of said carriage which is substantially the same as the
distance of the lowest point of said wheels below said carriage
whereby downward and upward rotation of the rearward portion of
said carriage by said handle produces correspondent upward and
downward confrontation of said buffer to said floor, said buffer
being displaced to the left of said longitudinal center line as
viewed from positions overlying said buffer and said floor, and
said rotation of said buffer is counter clockwise as viewed from
positions overlying said buffer and overlying said floor; a butane
powered engine mounted to said carriage; means for transmitting
power from said butane powered engine to said buffer, said power
transmission means including a centrifugal clutch for permitting
said buffer when in contact with said floor to not rotate at low
operating speeds of said engine, to rotate at high operating speeds
of said engine, and to operate at adjustable speeds between said
low operating speed and said high operating speed of said engine.
Description
This invention relates to buffers and specifically relates to a
butane powered internal combustion engine driven buffer which is
suitable for operator directed polishing of floors.
SUMMARY OF THE PRIOR ART
Heretofore, the power buffing of large interior floor areas of
buildings such as supermarkets, department stores, and the like has
been accomplished by electrically powered buffers. These
electrically powered buffers have included many serious
disadvantages.
First, the weight to horse power ratio of electric buffers is high.
As a result, an electric buffer of relatively low power is
extremely heavy.
Second, as electric buffers have low power, they drive the rotating
buffer at correspondent low speed. More time is required for the
buffer to scrub or polish a given unit of floor area.
Finally, electric powered buffers are typically dependent upon an
electrical power source by means of a cord. Any type of cord aroung
high speed rotating equipment is dangerous. Entanglement of the
cord in either the operator, the rotating buffer, or both is
mechanically or electrically dangerous. The cord is mechanically
dangerous in that operator injury or cord injury can result through
entanglement. The cord is electrically dangerous in that breaking
of the cord and release electrical energy to injure the buffer, the
power source or operator.
It should be noted in describing the prior art that known
electrical buffers powering 18-inch diameter buffers in contact
with the floor typically rotate at a speed of 150 rpm.
SUMMARY OF THE INVENTION
An improved floor buffer for operator directed polishing of a floor
is disclosed. A buffer carriage is disposed substantially
horizontally to the floor being polished and has a lower surface
exposed to the floor and an upper surface exposed away from the
floor. A handle is attached to the carriage. The handle extends
angularly upward and away from the carriage toward the operator
overlying a longitudinal axis along the carriage. At least two
wheels are rotatably mounted to the carriage. These wheels are
mounted for rotation about an axis transverse of the carriage
substantially normal to the longitudinal axis of the carriage. The
axis along which the wheels are mounted divides the carriage into a
forward portion and a rearward portion. A clockwise rotating buffer
is mounted to the carriage for rotation about the vertical axis at
the forward portion of the carriage, preferably displaced to the
right of the longitudinal axis of the carriage. This buffer extends
below the lower surface of the carriage to confront the floor. The
buffer confronts the floor below the lower surface of the carriage
which is substantially the same as the distance of the powest point
of the wheels below the carriage. Downward and upward rotation of
the rearward portion of the carriage by the handle produces
correspondent upward and downward adjustable confrontation of the
buffer to the floor at varying pressures. A butane powered engine
is mounted to the upper surface of the carriage. A transmission
between the butane powered engine and the buffer including a
centrifugal clutch and belt permits the buffer, when in contact
with the floor, not to rotate at low operating speeds of the
engine, to rotate at high operating speeds of the engine, and to
operate at adjustable speeds between the low operating speed and
the high operating speed of the motor.
Further Objects and Advantages of the Invention
An object of this invention is to disclose a buffer driven by a
butane powered internal combustion engine.
An advantage of the butane internal combustion engine power source
is that the weight to horse power ratio can be substantially
reduced. As compared to prior art buffers, an 18-inch diameter
buffer can be powered to rotate at a speed of 1,800 rpm.
Yet another advantage of the disclosed invention is that the buffer
cuts working time of an electric buffer in polishing a unit floor
area by at least two thirds.
An additional advantage of the butane powered internal combustion
engine is that emissions nor harmful to human beings in enclosed
areas are the output of a butane engine. Accordingly, it can be
freely used in enclosed buildings such as supermarkets, department
stores and the like.
A further advantage of the butane power source of this buffer is
that it is not dependent upon any type of a cord. Correspondingly,
entanglement hazards and electrical shock hazards are reduced.
A further object of this invention is to disclose a buffer mount
which is eccentric with respect to a longitudinal axis of the
carriage. Preferably, the buffer is driven for clockwise rotation
as in confronts the floor. The buffer is offset to the right of the
longitudinal axis defined by the handle mounted to the
carriage.
An advantage of this eccentric rotation of the buffer is that the
buffer can protrude to the side of the carriage and thus penetrate
under counter kick plates. Thus, the entirety of the floor,
including the under counter kick plate area, can be polished.
Yet another advantage of this invention is that the mounting of the
buffer to the left coupled with the non-symmetric weight
distribution on the buffer gives an optimum reaction. This optimum
reaction between the weight of the buffer, the support of the
carriage and buffer at the carriage wheels, and the torque produced
by the buffer contact on the floor, provides for an even movement
of the buffer over the floor without the torque of the buffer
tending to translate the buffering apparatus to one side or another
side.
A further object of this invention is to disclose a centrifugal
clutch belt drive for an internal combustion engine powered
buffer.
An advantage of the centrifugal clutch drive is that the buffer can
be stopped without turning off and restarting the motor.
A further advantage of the centrifugal clutch drive is that the
speed of the buffer is adjusted for all buffing situations. The
buffer can be stopped, slowed, or operated at full speed responsive
to corresponding speed changes at the motor.
A further advantage of the clutch drive is that the only part
incurring substantial wear --a V-belt-- can be changed through the
bottom of the buffer without disassembly of the machine.
A further object of this invention is to disclose a geometry of the
carriage which can be satisfactorily used with an internal
combustion engine drive. Specifically, the carriage is mounted at
wheels which provide both a means of transporting the carriage as
well as a fulcrum between the buffer on one side, and the operator
on the other side.
An advantage of the wheel fulcrum provided by this invention is the
downward weight at the handle is easily exerted by the operator to
raise and lower the buffer from the floor.
A further advantage of this arrangement is that by the expedient of
locating the fuel tank over the fulcrum provided by the carriage
wheels, variation of the fuel weight has little or no effect of the
weight on the buffer.
Yet another advantage of this invention is that the two wheel
fulcrum preferably used in this invention provides ease of moving
the buffer to virtually all operating positions.
A further object of this invention is to disclose a pair of
removable transport casters for transporting the buffer assembly to
and from the floor upon which it works.
An advantage of the removable casters is that the buffer is
rendered easy to transport. Moves such as up and down stairs and
truck loading can easily be made with the entire unit.
A further advantage of this invention is that the transport casters
are easily removable by a single person.
These and other objects and advantages of the invention will be
more apparent after referring to the following specification and
attached drawings in which:
FIG. 1 is a side elevation of the buffer of this invention;
FIG. 2 is a bottom plan of the buffer of this invention;
FIG. 3 is an enlarged side elevation section of the improved buffer
at the buffing apparatus along lines 3--3 of FIG. 2;
FIG. 4 is a top plan section of the buffer in the scale of FIG. 3
along lines 4--4 of FIG. 3;
FIG. 5 is a side elevation section of the buffer along lines 5--5
of FIG. 4 also in the scale of FIG. 3; and,
FIGS. 6 and 7 are details illustrating the removable transport
casters shown attached to the invention in FIGS. 1 and 2.
Referring to FIGS. 1 and 2, carriage C having two fulcrum mounted
wheels W is illustrated. Buffer B driven by butane powered engine E
is attached to the carriage forward of wheels W. Variable speed of
engine E as well as positioning of buffer B to and from
confrontation with the floor is provided by controls on the end of
handle H. Removable transport casters T used to transport the
buffing apparatus to and from a work site are shown.
In operation, the buffer is moved to the work site with transport
wheels T attached. At the work site, transport wheels T are
removed. Engine E is started through control H to rotate the buffer
B. By simultaneously balancing and transporting carriage C on
wheels W, the buffer B can be moved in polishing confrontation
rapidly over a floor.
Referring to FIGS. 1 and 2, and in particular to FIG. 2, the
construction of carriage C can be illustrated. Broadly, carriage C
is constructed of steel and has an overall rectangular shape. It is
most convenient to describe carriage C in terms of functional axes
which are defined transversely and longitudinally of the
carriage.
Carriage C includes a transverse axis 14. Axis 14 is the axis about
which wheels W rotate. Two wheels W are hereshown mounted in
apertures 16 extending through the carriage at and about shafts 18
on transverse axis 14.
Realizing that during a buffing operation transport wheel T will be
removed, it will be seen that carriage C is divided in forward
portion 20 forward of axis 14 and in after portion 22 behind axis
14.
Moreover, it will be seen that when transport wheels T are removed,
the apparatus of this invention rests upon the three point stance
provided by buffer B and the two wheels W. Pivoting of the carriage
C about the wheels W is possible. Downward movement of handle H
will pivot the buffer B upwardly and away from polishing
confrontation with the floor to be polished. Conversely, upward
movement of handle H will pivot the buffer B downward and into firm
polishing confrontation with the floor.
Second axis 25 extends longitudinally of the buffer. As can be
seen, it is equidistant between the respective side edges 26, 27 of
carriage C.
The leading edge of forward portion 20 of carriage C is
semicircular comprising preferably half a circle. This circular
shape conforms to a circle having a diameter equal to the width of
carriage C and gives the forward edge of the buffing apparatus a
rounded profile wherein maximum penetration of the buffer to
counter kick plate, counter edges, and walls may be obtained.
The edge of carriage C is typically provided with a depending skirt
22. This skirt 22 gives the otherwise flat surface of the carrriage
structural strength.
Referring to the bottom plan view of FIG. 2, an aspect of the
invention will be noted that may not be immediately apparent.
Buffer B is eccentrically mounted with respect to longitudinal
center line 25 along eccentric longitudinal center line 30. This
eccentric mount of the axis of the rotating buffer B provides two
functions.
First, buffer B is set eccentrically so that at its rotating side
edge 33, it may penetrate underneath counter kick plates and the
like as well as making a maximum penetration to walls which may
define floor edges. It can thus be seen that the buffer can be
moved along the edge of a wall leaving little or no unpolished
floor between the space where the wall ends on one hand, and the
floor begins on the other hand.
Second, buffer B is typically rotated in a clockwise direction as
viewed from the position of the operator overlying the buffer. As
viewed in the bottom plan view of FIG. 2, the rotation of the
buffer would appear to be counter clockwise.
It has been found with a clockwise rotating buffer eccentrically
offset to the right, that the torque of the buffer in contact with
the floor produces minimum bias against the handle H. Stated in
other terms, the buffer had its tendency to turn the carriage C and
everything there attached to one side or the other side minimized
with the offset hereshown.
Understanding the configuration of the carriage C and the eccentric
mounting of the buffer B, the drive of the buffer relative to the
carriage can now be set forth.
Buffer B is typically an 18-inch diameter buffer provided with a
steel wool bottom. The design speed of the buffer is such that high
speed rotation in the range of 1,200 rpm can be expected. It has
been found to be extremely important that buffer B be balanced
before attachment as conventional balancing techniques well known
to those skilled in the art can be applied, balancing of buffer B
will not be discussed further herein.
Referring to FIG. 1, engine E typically comprises a Briggs and
Stratton 8 horsepower air-cooled engine. Typically, this engine E
is converted for butane operation and includes an electric starter
40 powered by a battery 41, the starter being activated by an
ignition key 42 mounted to handle H. Speed control of engine E is
provided by a conventional throttle 44 and connected throttle cable
45 to the engine E.
Engine E is mounted to carriage C at pair L sectioned brackets 62.
Brackets 62 support engine E at a preselected distance above
carriage C where motor shaft 60 can be disposed in a convenient
buffer driving disposition.
A butane supply in the form of a cylindrical tank 46 is carried on
carriage C. Tank 46 is typically mounted with its center of gravity
substantially on axis 14 and with its center of gravity on the
symmetric longitudinal axis 25 of carriage C.
Tank 46 supplies butane to the carburetor 48 of engine E. This
occurs through a shut-off valve 50, a pressure regulator 53, and
piping 52 to carburetor 48. It has been found preferable to turn
engine E on and off by opening and closing shut-off valve 50.
Additionally, operation of a manual control at pressure regulation
valve 53 can limit fuel to and from engine E.
Having set forth the general configuration of carriage C, the
eccentric location of buffer B and the general operating
characteristic of the butane powered engine E, attention may now be
directed to the detailed construction and drive of the buffer B as
illustrated with respect to the enlarged sectional views of FIGS.
3, 4 and 5.
Drive shaft 60 of engine E is shown in FIG. 3 extending downwardly
from motor mount 62 through aperture 64 in carriage C. At the
bottom end of drive shaft 60 there is affixed centrifugal clutch
65. Centrifugal clutch 65 is a Heavy Duty Commercial Industrial
Clutch manufactured by Comet Industries of Richmond, Indiana. In
operation, this clutch with increased speed urges opposing pulley
sections 67, 68 into increasing contact with a V-belt 70. Thus, in
driving buffer B, increased engine speed produces increased
pressure on V-belt 70 with resultant increased power transmission
to buffer B.
Aperture 64 in carriage C privides an advantage that is not
immediately apparent. This aperture 64 is sized so that removal and
replacement of belt 70 can occur without machine disassembly.
Referring to FIGS. 3, 4 and 5, the mounting of buffer B to carriage
C may not be described. Typically, conventional bearing housing 71
is mounted to the underside of carriage C below an aperture 72
through the carriage. A bearing 74 carried within the bearing
housing has shaft 75 mounted within it. Shaft 75, at its lower end,
has balanced disk 77. Disk 77 includes a series of pawls 76
protruding downwardly from it. Pawls 76 penetrate into
corresponding apertures 79 on the surface of masonite disk 80 to
which the polishing surface 82 of the buffer is mounted. Typically,
disk 80 has central aperture 84 therein. Aperture 84 is pierced by
bolt 86 which is threaded into threaded aperture 87 at the lower
end of shaft 75.
Attachment of rotating disk 80 to the buffer can be readily
understood. By registering four pawls 76 overlying four
complementary apertures 79 in disk 80, disk 80 may be confronted to
balanced disk 77 attached to the bottom of shaft 75. Thereafter,
the tightening of bolt 86 can be used to urge and maintain masonite
disk 80 in contact with the rotating and balanced disk 77, thereby
transferring any rotation of shaft 75 firmly and positively to
buffer B.
As can be seen, shaft 75 extends upwardly and above the upper
surface of carriage C. At this juncture, there is affixed pulley
90. Pulley 90 is keyed to shaft 75 so that rotation of the pulley
90 produces correspondent rotation of buffer B. It will be apparent
that a speed reduction from centrifugal clutch driven pulley
sections 67, 68 to the buffer pulley 90 results. This speed
reduction is in the order of one half. In any event, pulley sizing
from the motor on one hand, to the buffer on the other hand, is
designed to rotate the buffer at an approximate speed of 1,200 rpm,
when the motor is operating at full throttle.
In the interstitial area between the bottom of the carriage C and
the upper rotating surface of the buffer B, it is desirable to
place guard 96. Guard 96 functions as a safety mechanism to prevent
the operator or object from becoming entangled between the high
speed rotating buffer on one hand, and the carriage underside on
the other hand. Additionally, guard 96 serves as a splash plate.
Assuming that the buffer of this invention is used for scrubbing
and the like with water, splashing may be strictly confined to the
buffer vicinity and prevent it from flying upwardly where
surrounding counters, walls and the like may become unnecessarily
soiled.
Having set forth the full construction of the buffer itself,
attention may now be directed to removable transport wheels T as
fully shown in FIGS. 1, 2, 6 and 7.
Referring to FIG. 2, transport wheels T are each rotatably mounted
at opposite ends of a shaft 100. Shaft 100 has affixed thereto two
angle bars 102.
Referring to the views of FIGS. 6 and 7, the function of the angle
bars in fastening the transport casters T to the carriage C can be
illustrated. Typically, angle bars 102 are each spaced on either
side of shaft 100 so as to accommodate the width of carriage C
snugly therebetween. The rearward edge of angle bar 102 at 104 is
bent upwardly and thereafter draped over the end of the carriage C
at lip 106.
The forward end of the angle bar 102 is held to the carriage C be
means of pin 108. Pin 108 penetrates through corresponding
complementary apertures in the side of the angle bar and in the
side of the carriage.
Attachment and removal of the transport casters T can be easily
understood. Typically, angle bars 102 are placed along opposite
sides of the carriage C so as to snugly receive the carriage
therebetween. Thereafter, angle bars 102 at lip 106 are rotated
over an edge of the carriage C and rotated clockwise in the view of
FIG. 7 upwardly and under the carriage C. When the aperture in
angle bar 102 is registered with a correspondent aperture in the
carriage C, pin 108 is inserted. The transport casters T thus
become fastened to the carriage C permitting transport of the
buffer to and from a floor where it is used.
It should be apparent to those skilled in this art that this
invention will admit of a number of other embodiments. For example,
by offsetting the buffer to the left and changing the direction of
buffer rotation from clockwise to counter clockwise, the desirable
torque characteristic hereinbefore explained can be achieved.
Likewise, other transmissions for transmitting the power of the
engine to the buffer can be used so long as variable power can be
transmitted to the buffer with variable engine speed, and so long
as when the engine is idling and buffer B is in contact with the
floor, all rotation of the buffer ceases. Likewise, other
modifications can be made to this invention without departing from
the spirit and scope thereof.
* * * * *