U.S. patent number 3,684,941 [Application Number 05/163,179] was granted by the patent office on 1972-08-15 for portable battery powered eraser and support therefor.
This patent grant is currently assigned to Addressograph Multigraph Corporation. Invention is credited to John J. Van Acker, Robert E. Zimmer.
United States Patent |
3,684,941 |
Van Acker , et al. |
August 15, 1972 |
PORTABLE BATTERY POWERED ERASER AND SUPPORT THEREFOR
Abstract
A rechargeable cordless eraser comprising a carrier for
supporting and electrically charging the eraser when not in use.
The eraser includes socket means formed in the housing thereof
adjacent one end and having a transverse retainer bar extending
between opposite sidewalls of the socket. A pair of charging
contact rings are spaced apart longitudinally on the retainer bar.
The carrier is adapted to be attached to and supported from a
drafting table or the like and includes hook means adapted to
extend into the socket means on the eraser between opposite sides
thereof and engage the carrier bar. The hook means includes an
upwardly opening slot dimensioned for receiving said retainer bar
and a pair of deflectable spring contacts are seated in the slot of
the hook for supplying charging current to the contacts of the
eraser and for biasing the retainer bar against the lower end of
the slot to retain the eraser in hanging position on the hook when
not in use.
Inventors: |
Van Acker; John J.
(Chesterland, OH), Zimmer; Robert E. (Niles, IL) |
Assignee: |
Addressograph Multigraph
Corporation (Mount Propect, IL)
|
Family
ID: |
22588821 |
Appl.
No.: |
05/163,179 |
Filed: |
July 16, 1971 |
Current U.S.
Class: |
320/115;
15/DIG.1 |
Current CPC
Class: |
H01M
10/46 (20130101); B43L 19/0006 (20130101); Y10S
15/01 (20130101); Y02E 60/10 (20130101) |
Current International
Class: |
B43L
19/00 (20060101); H01M 10/46 (20060101); H01M
10/42 (20060101); H01m 045/04 () |
Field of
Search: |
;320/2 ;15/DIG.1
;30/DIG.1 ;32/DIG.8 ;240/10.6 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Miller; J. D.
Assistant Examiner: Hickey; Robert J.
Claims
What is claimed as new and desired to be secured by Letters Patent
Of the United States is:
1. In combination, a support carrier for holding an electrically
charging battery powered portable implement, such as cordless
electric erasers and the like, said implement including a housing
defining a socket means adjacent one end and a transverse retainer
bar extending between opposite sides of said socket, means
including a pair of charging contacts spaced longitudinally on said
bar, said carrier including hook means adapted to extend into said
socket means between opposite sides thereof and including an
upwardly opening slot for receiving said retainer bar of said
implement, and a pair of deflectable contacts in said slot for
supplying current to said charging contacts on said implement and
biasing said retainer bar against wall surfaces of said slot to
support said implement in hanging position from one end while not
in use.
2. The combination of claim 1 wherein said carrier including a base
adapted to be attached to a fixed object, such as a table, or the
like, and longitudinal connector means interconnecting said base
and said hook means permitting relative rotation between said hook
means and said base around the longitudinal axis of said connector
means.
3. The combination of claim 2 wherein said connector means
comprises a spring permitting limited angular deflection between
said base and hook means transversely of said longitudinal
axis.
4. The combination of claim 2 wherein said connector means
comprises a helical coil spring with a plurality of said coils
wound around said longitudinal axis, at least one end of said coil
spring mounted for rotation around said axis relative to said
base.
5. The combination of claim 4 including line cord means for
supplying current to said contacts in said hook means, said line
cord means extending between said base and said hook means through
the coils of said spring along said longitudinal axis.
6. The combination of claim 5 wherein said line cord means includes
plug means at the free end for connection to an AC power source and
rectifier means for converting AC to DC for supply to said
contacts.
7. The combination of claim 4 including stop means for limiting
rotation of said end coil relative to said base.
8. The combination of claim 1 wherein said socket means is defined
adjacent a corner of said one end of said implement and includes at
least one stop wall preventing said hook means from entering said
socket means from a wrong direction thereby to insure proper
polarity for recharging said implement.
9. The combination of claim 8 wherein said contacts on said
retainer bar are positioned adjacent opposite sidewalls of said
socket means and are spaced apart by a midportion of said bar.
10. The combination of claim 1 wherein said slot in said hook means
includes a pair of sloped opposite walls terminating in a rounded
end, said contacts on said hook means including cam portions
projecting outwardly of one wall toward said opposite wall and
sloped to bias said carrier bar toward said rounded end.
11. A support carrier for holding and electrically charging a
battery powered portable implement, said implement including a
housing defining a socket means adjacent one end thereof, a
transverse retainer bar extending between opposite sides of said
socket, means including a pair of charging contacts spaced
longitudinally on said bar, said carrier comprising a fixed base
portion and an implement receiving portion, means interconnecting
said base and receiving portions comprising resilient biasing means
movably attaching said receiving portion to the base portion, said
receiving portion further including an upwardly opening slot for
receiving said retainer bar of said implement and means connecting
said charging contacts to a source of electric current.
12. The support carrier as claimed in claim 11 wherein said
upwardly opening slot is equipped with a pair of deflectable
contacts in said slot for supplying current to said charging
contacts on said implement and biasing said retainer bar against
wall surfaces of said slot to support said implement in hanging
position from said one end.
13. The support carrier as claimed in claim 11 wherein said
resilient biasing means is a coiled spring extending along a
longitudinal axis between said base and receiving portion having
its free ends fixed respectively to said base portion and receiving
portion permitting limiting angular deflection between said base
and receiving portion relative to said longitudinal axis.
14. The support carrier of claim 13 including mounting means for
securing one end of said biasing means to the receiving portion
permitting rotation between the receiving portion and the base.
15. The support carrier of claim 14 including stop means for
limiting rotation of said end coil relative to said base biasing
means.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a new and improved cordless,
rechargeable, battery-powered, portable implement such as a
cordless electric eraser which is used by secretaries, students,
teachers and is especially useful to draftsmen. In many portable
implements it is undesirable to have attached power cords connected
therewith because it interferes with the free and unencumbered use
of the implement. This is especially true with electric erasers in
order to easily accomplish an erasing job that may be remote from
where the implement is stored.
Accordingly, it is desirable and an object of the present invention
to provide a new and improved cordless, rechargeable,
battery-powered, electrical implement, more particularly, a
cordless electric eraser for general use in offices and schools and
hanger therefor that conveniently and safely stores the implement
when not in use.
It is desirable and an object of the present invention to provide
an arrangement whereby a cordless electric eraser or other
implement may be handily available for use when desired and, when
not in use, may be conveniently and safely stored and supported
while the battery is being recharged automatically.
In addition, it is desirable to provide a new and improved
cordless, portable, electric eraser which can be easily and
accurately manipulated by hand and, when not in use, supported in a
recharging carrier which insures that proper electrical charging
polarity is established while conveniently supporting the implement
in a hanging position in readiness for the next usage.
Another object of the invention is to provide a new and improved
recharging support carrier for a portable electric implement, which
carrier is easily adapted for universal mounting on a fixed object,
such as a desk, drafting table, or wall member and which provides a
hook having limited flexible movement for ease in hanging up or
unhooking the rechargeable implement.
BRIEF DESCRIPTION
Briefly, the new and improved, rechargeable, portable, electrical
implement of the present invention includes a carrier for
supporting the implement and for supplying electrical charging
current to the battery of the implement when in supported position
on the carrier. The carrier is adapted to be mounted in a
convenient location on a table, wall, or structural surface. The
cordless electric implement includes socket means adjacent one end
of the casing thereof having a transverse retainer pin or bar
extending between opposite sides of the socket and including a pair
of ringlike charging contacts spaced apart longitudinally on the
pin for supplying recharging current to the battery contained in
the housing of the implement.
The support carrier includes a hook means dimensioned as to be
received into the socket of the implement. The hook means is formed
with an upwardly opening slot for receiving the retaining pin when
the implement is hung up for recharging when not in use. A pair of
deflectable detent contacts are mounted in the slot of the hook
means for making electrical contact with and supplying current to
the ring contacts on the carrier pin and the deflectable contacts
bias the pin against the bottom portion of the hook slot to
swingably support the implement in a hanging position ready for
usage. The cooperating hook means and the socket means in the
implement housing are dimensioned to provide for only one
particular way of engagement therebetween, and this insures that
proper polarity is achieved for supplying charging current to the
battery of the implement from the contacts in the hook means.
FIGURE DESCRIPTION
FIG. 1 is a perspective view illustrating a support carrier for
automatic recharging of a battery powered electrical implement as
constructed in accordance with the features of the present
invention;
FIG. 2 is a side elevational view of the support carrier and the
portable electric eraser as it is hung up in place while being
recharged automatically;
FIG. 3 is an enlarged side elevational view of the support carrier
with portions broken away and fragmented;
FIG. 4 is a top plan view of the support carrier looking downwardly
in the direction of the arrows 4--4 of FIG. 2;
FIG. 5 is an outer and elevational view of the support carrier with
portions broken away looking in the direction of the arrows 5--5 of
FIG. 2;
FIG. 6 is a fragmentary lower elevational view of the outer end
portion of the support carrier looking in the direction of the
arrows 6--6 of FIG. 2; and
FIG. 7 is a schematic diagram of an electrical circuit for a
rechargeable cordless electric eraser of the present invention.
DESCRIPTION
Referring now, more particularly, to the drawings, therein is
illustrated a new and improved rechargeable portable electric
eraser for use by draftsmen, and the like. The portable electric
eraser includes an elongated hollow housing 10 (FIG. 2) formed in
two parts which are connected together and are preferably
manufactured of molded plastic material. As shown in FIGS. 2 and 4,
the housing parts or halves 12 are hollow in order to accommodate a
drive shaft 14 having an eraser chuck 16 on the outer end adapted
to hold an elongated, cylindrical, rubber eraser 18. The shaft 14
is driven through a pair of reduction gears 20 by a low voltage DC
powered electric motor 22. The motor is controlled through a
control switch 24 having a push button 26 (FIG. 7) which is
conveniently located for operator manipulation. The housing or
casing also holds a rechargeable nickel cadmium battery 28.
When not in use, the eraser is adapted to be hung up and supported
from one end of the housing 10 which is shaped to provide a
hook-receiving socket 30 formed in the upper portion of the housing
10. The socket 30 is formed by the longitudinal inner socket wall
32, a transverse bottom wall 34 which intersect one another to
provide an interior corner and by opposite housing sidewalls 36. A
transverse carrier pin 38 for supporting the eraser in hanging
position extends between the opposite sidewalls 36 of the
socket.
As shown in FIGS. 2 and 4, a pair of annular contact rings 40 and
42 are mounted on the carrier pin 38 adjacent opposite ends thereof
and the midportion on the carrier pin is formed of insulating
material to effect electrical insulation between the pair of
contact rings.
As best shown in FIG. 2 and the wiring diagram of the portable
electric eraser in FIG. 7, the contact rings are connected to
suitable circuitry within the eraser housing via contact members 44
and wires 45, 46, 47, 48 and 49, for providing charging current for
the battery and for delivering electrical power from the battery to
operate the motor 22 as controlled by the switch push button
26.
In accordance with the present invention, a carrier assembly 50
(FIG. 1) is provided for supporting the cordless electric eraser
when not in use and for automatically charging the battery 28 at
this time. The carrier assembly includes a pivotably mounted hook
member 52 which is connected to a fixed base 54 by an elongated,
helically coiled spring 56. The spring connection permits relative
pivotal movement between the base and hook members about the
longitudinal axis of generation of the helical spring as well as
limited flexible movement between the base and hook in both
directions about axes horizontally and vertically transverse to
said longitudinal axis of the spring.
As the portable electric eraser is hanging in place or moved into
or out of hanging position, this limited flexible movement of the
hook provides ease of action. The base 54 is adapted to be fixedly
and permanently attached to a drafting table 58 or other structures
by means of fasteners 60.
The current for recharging the battery 28 in the portable electric
eraser is supplied through a line cord 62 having a plug assembly 64
at the end thereof which is adapted to be inserted into a
conventional AC outlet. The plug assembly 64 contains a rectifier
and a voltage reducing circuit for converting the AC voltage from a
convenient outlet to low voltage DC current for recharging the
battery 28 of the portable electric eraser.
As best shown in FIG. 3, the hook member 52 includes an upwardly
opening carrier bar receiving slot 66 which is defined by an outer
finger portion 68 adjacent the outer end. The slot 66 includes
parallel sides 70 and 72 sloped with respect to the vertical, which
are spaced apart a distance slightly larger than the diameter of
the carrier bar 38 and the contact rings 40 and 42 thereon. The
lower end of the slot is defined by a closed rounded end or stop
surface 74 of substantially the same or slightly larger diameter
than the contact rings 40 and 42.
In accordance with the present invention, the carrier pin 38 is
biased toward the closed lower end 74 of the slot 66 while the
cordless electric eraser is hung on the hook 52 by a pair of
deflectable contact members 76 and 78 (FIG. 4). Free end portions
of the contacts 76 and 78 project outwardly from the rear side 70
of the slot 66 toward the adjacent or front side 72. The contacts
76 and 78 include outer end portions 76a and 78a (FIG. 5),
respectively, which are adapted to engage the respective contact
rings 40 and 42 and make electrical contact therewith for charging
the battery 28. In addition, the contacts bias the carrier pin
downwardly against the lower end surface 74 of the slot 66 in the
hook to prevent accidental dislodgment from the hook. As the
carrier pin 38 is moved into or out of the slot 66, the contacts,
and particularly the end portions 76a and 78a, thereof, are
deflected inwardly toward the inside rear wall surface 70 of the
slot and subsequently spring back outwardly toward the opposite
wall 72. The contacts 76 and 78 thus perform a dual function in
making electrical contact between the respective wires of the line
cord 62 and the contact rings 40 and 42 on the rechargeable
portable electric eraser and, in mechanically holding and retaining
the carrier pin 38 in a downwardly biased condition against the
lower end surface 74 of the slot 66 in the hook member 52.
Referring again to FIG. 3, one of the leads of the cord 62 is
connected to the contact 78 at the connection terminal 79.
Similarly, the other lead in the line cord 62 is connected to the
contact 76 as best shown in FIG. 5 at the connection terminal 77.
The contacts 76 and 78 are connected to provide for the correct
polarity to supply charging current to the respective contact rings
40 and 42 on the eraser. The respective contacts 76 and 78 are
mounted in the hook 52 so that the outer free end portions 76a and
78 a act against the edges of slots 80 (FIG. 3) formed in the hook
member and dimensioned to a width substantially equal to the width
of the contacts. As best shown in FIG. 3, the contacts are freely
deflectable by the carrier pin and rings 40 and 42 and are
preferably formed of resilient springlike metal having good
electrical conductance.
The underside of the hook member 52 is covered by a closure plate
84 (FIG. 3) which is held in place by a cap screw 86 which projects
upwardly into a threaded boss portion formed in the hollowed out
underside of the hook member, as best shown in FIG. 3. The hollowed
out portion accommodates the forward end of the helically coiled
spring 56, and the screw 86 projects upwardly through the forward
end loop 56a of the spring which is bent transversely to the other
coils in the body of the spring. The screw 86 thus prevents the
forward end of the spring from rotating relative to the hook member
52 and accomplishes the fixed connection between the spring 56 and
hook member 52.
The intermediate coils of the spring 56 provide a tubular enclosure
for enclosing and protecting the line cord 62 which extends
forwardly from a hollowed out underside of the fixed base 54 into
the hollowed out underside of the hook member 52. As shown in FIGS.
2, 3 and 4, there is provided a space between the adjacent facing
end surfaces of the base and hook member and this permits limited
lateral deflection of the hook member 52 in a cantilever fashion
relative to the base. The base is usually permanently attached to a
convenient support structure, such as the edge or bottom of a
drafting table, and the like, and the spring connection permits the
hook member 52 to deflect transversely in a vertical direction as
well as in a horizontal direction. This action facilitates the
hanging up of the eraser after usage and makes it easier to guide
the carrier pin 38 of the portable electric eraser into the slot 66
of the hook member 52. It should be noted that the stop walls 32
and 34 which define the inner socket corner in the eraser housing
10, prevent the improper engagement of the carrier pin within the
slot in a manner which might cause reverse polarity of the
charging. These walls are positioned to permit insertion of the
hook 52 into the socket 30 in only one way (shown in FIG. 2), and,
when inserted in this manner, correct polarity of current from the
charging line cord 62 through the spring contacts 76 and 78 to the
contact rings 40 and 42 on the electric eraser is insured.
As best shown in FIG. 3, the rearward end portion of the spring 56
extends into the base 54 through a horizontal bore 54a (FIG. 6) and
rearwardly thereof the underside of the base is hollowed out, as at
54b (best shown in FIGS. 3 and 6) in order to permit several of
rearward end coils of the spring to freely rotate within the base
structure. The rear end of the spring is deformed so that a tang
56b is bent to project forwardly toward the hook member 52. The
tang 56b is adapted to limit the extent of rotation of the rearward
end of the spring 56 about the longitudinal axis of the spring
relative to the base. The tang is engageable with a radially
inwardly directed, integrally formed stop member 54d (FIG. 3) and,
accordingly, the relative rotation between the spring 56 and the
base 54 is limited to one revolution, or slightly less, as
permitted by the relative position of the tang and stop.
In order to retain the rearward end portion of the coil spring 56
within the base 54 and prevent forward withdrawal of the spring, a
retaining insert of thin material as shown as 88, is inserted into
a downwardly opening, thin, transverse slot 54c, defined in the
underside of the base (FIG. 6). The retaining sheet 88 includes a
central aperture therein slightly larger than the outside diameter
of the coils of the spring 56, and the forward end tang 56b is
engageable against the retainer to prevent forward withdrawal of
the spring from the base.
It will be appreciated that the construction of the carrier
assembly just described provides a unique and particularly valuable
technique for storing the implement. The hook member is adapted for
limited movement sideways, and up and down relative to the base and
the implement itself is swingably mounted in the hook member 52. In
the circumstance that the mounted implement is suddenly jarred, the
nature of the mounting is such that it would absorb the sudden
movement through the combination of the swinging action of the
carrier pin 38 disposed in the slot 66 of the hook member 52 and
the pivotable movement of the member 52 relative to the base
54.
While there has been illustrated and described a single embodiment
of the present invention, it will be appreciated that numerous
changes and modifications will occur to those skilled in the art,
and it is intended in the appended claims to cover all those
changes and modifications which fall within the true spirit and
scope of the present invention.
* * * * *