U.S. patent number 3,747,594 [Application Number 05/200,374] was granted by the patent office on 1973-07-24 for portable electric appliance.
This patent grant is currently assigned to A. F. Dormeyer Manufacturing Co.. Invention is credited to Walter F. Bishop.
United States Patent |
3,747,594 |
Bishop |
July 24, 1973 |
PORTABLE ELECTRIC APPLIANCE
Abstract
The appliance includes a hand-held motor unit with a motor
output end for receiving a plurality of interchangeable working
tool heads wherein the motor transmits power to the heads for
operating same. An eccentric is provided on the output shaft of the
motor for engagement with a yoke on a work tool head to convert
rotary motion of the motor to reciprocating or oscillating motion.
A releasable clip engages with socket means on the heads for
attaching and retaining the head in place on the motor unit.
Inventors: |
Bishop; Walter F.
(Bloomingdale, IL) |
Assignee: |
A. F. Dormeyer Manufacturing
Co. (Chicago, IL)
|
Family
ID: |
22741450 |
Appl.
No.: |
05/200,374 |
Filed: |
November 19, 1971 |
Current U.S.
Class: |
601/93; 30/228;
30/43.9 |
Current CPC
Class: |
A61H
7/005 (20130101); B26B 19/48 (20130101) |
Current International
Class: |
B26B
19/48 (20060101); B26B 19/38 (20060101); A61H
7/00 (20060101); A61h 007/00 () |
Field of
Search: |
;128/48,49,32,51,52
;30/247,43.92,43.9 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Trapp; Lawrence W.
Claims
I claim:
1. A portable electric appliance comprising a power unit adapted to
receive interchangeable heads and a detachable head, said power
unit including a motor mounted in a casing rotationally driving an
eccentric, orientation means extending from the casing in the form
of guide pins for orienting the head relative the unit, and
releasable coupling means carried by the casing in the form of
spring clips for detachably securing the head to the power unit,
said detachable head including a housing, said housing including
guide holes for receiving said pins and sockets coacting with said
clips, a work tool mounted on the housing for movement relative the
housing, yoke means within the housing connected to the work tool
and coacting with the eccentric to transmit power to the work
tool.
2. A portable electric appliance as defined in claim 1, wherein the
work tool of said detachable head includes a massaging member
attached to a pivotable shaft carried by the housing, and said yoke
means being mounted on the shaft, whereby oscillating motion is
applied to the shaft.
3. A portable electric appliance as defined in claim 2, wherein
dampening means is provided in the housing between the housing and
yoke to dampen movement of the yoke and shaft and thereby reduce
noise.
4. A portable electric appliance as defined in claim 3, wherein
said dampening means includes a resilient pad.
Description
This invention relates in general to a power driven hand-held
appliance and, more particularly, to an appliance including a power
unit capable of having a plurality of work tool heads that may be
interchangeably attached.
Because of the increasing costs of labor and manufacturing
materials, it becomes more necessary to develop an appliance that
will accomplish more than one function and be less costly than a
plurality of individual appliances. It therefore can be appreciated
that economy is enjoyed where a single power unit can be utilized
for interchangeably operating a plurality of work tools. It has
been known to provide electrical appliances having a power unit
with capabilities of selectively attaching thereto a number of
different work tool heads, but such appliances have required
complex and costly mechanisms for attaching the heads to the power
unit.
The present invention solves some of the problems of heretofore
developed multi-purpose appliances in providing a simple and
inexpensive appliance capable of satisfying a number of functions.
More specifically, the appliance of the invention includes a single
power unit having a plurality of interchangeable, detachable and
selectively usable heads, each of which provide different
functions. While the appliance of the invention includes a power
unit with interchangeable heads that will provide hair-clipping,
body-massaging and material-cutting operations, it should be
appreciated that other interchangeable heads providing any suitable
function could be employed. A rotary motor is provided in the power
unit which coacts with yokes in the work tool heads, where the
yokes are connected to movable parts to which it is desired to
impart reciprocating or oscillating motion. Thus, the drive
coupling between the work tools and the motor converts rotary
motion to reciprocating or oscillating motion. A releasable clip
and guide means on the power unit coacts with guide means and clip
socket means on the work tool heads to enable easy interchanging of
work tool heads.
It is, therefore, an object of the present invention to provide a
new and improved portable electric appliance having a plurality of
work tool heads capable of being driven individually by the power
unit and being easily interchanged when desired.
A further object of this invention is in the provision of a new and
improved simple and low-cost coupling means for detachably coupling
interchangeable work tool heads to a single power unit.
FIG. 1 is a side elevational view of the power unit according to
the invention and illustrating in phantom the hair clipper head in
attached position;
FIG. 2 is a top plan view of the power unit and illustrating the
hair clipper attachment in attached position;
FIG. 3 is a side elevational view of the power unit with the cover
removed;
FIG. 4 is a top plan view of the power unit as shown in FIG. 3;
FIG. 5 is an end elevational view of the power unit as shown in
FIG. 4 looking at the drive or output end;
FIG. 6 is a fragmentary enlarged detailed view illustrating the
eccentric shaft mounting arrangement;
FIG. 7 is a back view of the hair clipper attachment head showing
the end that couples to the power unit;
FIG. 8 is a detailed sectional view taken substantially along line
8--8 of FIG. 1 showing only the interaction between the spring
clips on the power unit and clip sockets on the hair clipper
attachment;
FIG. 9 is a side elevational view of the massager head with some
parts broken away to show underlying parts;
FIG. 10 is a back view of the massager head showing the end that
couples to the power unit;
FIG. 11 is a side elevational view of the scissors head attachment
showing some parts in section for purposes of clarity;
FIG. 12 is an end view of the scissors head looking at the scissors
blades and with the guard blade attachment removed; and
FIG. 13 is a back view of the scissors head showing the end
coupling to the power unit.
Referring now to the drawings and in particular to FIGS. 1-7, the
appliance of the invention includes generally a power unit 15 and a
detachable head 16 which is illustrated in FIGS. 1-7 as a hair
clipper head. The head is detachable so that a head having a
different work tool may be interchanged and powered by the same
power unit 15, such as the detachable head shown in FIG. 9 which
performs a massage function, and the detachable head shown in FIG.
11 in the form of a scissors for cutting materials. Thus, it is a
simple matter to interchange heads and perform various functions
with a single power unit thereby providing an appliance for
performing plural operations at a lesser cost than a plurality of
individual appliances.
The detachable hair clipper head 16 is merely illustrated in
phantom, but it will be understood that it includes fixed and
movable blades of the usual configuration where the movable blade
is powered by the power unit 15. It should be recognized that
detachable heads performing functions other than those disclosed
could be used and are contemplated within the scope of the
invention. For example, the massage head could serve to receive a
polishing tool for polishing leather goods, automobiles, or the
like. It should be further recognized that the appliance of the
invention provides a plurality of motor driven work tools wherein
rotary motion generated by the power unit is converted to
reciprocating or oscillating motion in the detachable head.
The power unit 15 includes a casing preferably molded of a suitable
plastic material having a base 17 and a cover 18 coacting to define
a chamber within which a motor 19 is mounted having an output shaft
20. A pinion drive gear 21 is carried on the motor shaft 20 and in
meshing engagement with a larger pinion driven gear 22, which is in
turn mounted on an eccentric shaft 23. A metal sleeve bearing 24
press fit in a hole formed in the support flange 25 bearingly
supports the eccentric shaft 23. The support flange is integrally
molded with the casing base. An eccentric drive cam member 26 is
mounted on the eccentric shaft 23 whereby rotation of the shaft
causes the drive member to move eccentrically relative to the
shaft.
Terminal pins 30 connected to the motor 19 through conductors 31
enable a removable plug-in cord assembly to be used for connecting
the motor to a source of electrical energy. A slide switch 32
mounted on the side of the casing may be manipulated by the hand to
turn the motor on and off.
The interchangeable attachments are detachably mounted on the power
unit 15 wherein a pair of spring clips 40 are secured to the
support flange 25 by guide pin studs 41. The spring clips 40 are
formed on the opposite ends of a base plate 42 which is secured
flush against the support flange 25 in a properly oriented
relationship with respect to the eccentric drive cam 26. The stud
portion of each guide pin stud extends through the base plate 42
and through the support flange 25 to a seated position defined by a
shoulder 43, thereby leaving the guide pin portion 44 protruding
from the base plate 42. The inner ends of the guide pin studs are
deformed to lock the studs in place wherein the studs thereby take
the form of a rivet to fasten the spring clips 40 in place on the
support flange 25 of the casing. As seen particularly in FIG. 7,
the housing 50 of the clipper head 16 is formed with a junction
face 51 that meets with the power output unit 15 and in which is
provided spring clip sockets or holes 52 formed with notches or
shoulders 53 (FIG. 8) which coact with the spring clips to lock the
head 16 onto the power unit as seen in FIG. 8. The spring clip
holes 52 are of sufficient size to permit expansion of the spring
clips 40 as they are forced into the holes and wherein the spring
clips come together to lock on the shoulders 53 when they have
seated as shown in FIG. 8. Detachment of the head 16 from the power
unit 15 is easily accomplished by separating the head from the
power unit which causes spreading of the spring clips 40 so that
they ride over the shoulders 53 as the clips are retracted from the
holes 52.
To further orient an interchangeable head with respect to the power
unit, a tongue 57 is integrally formed on the support flange 25 of
the power unit casing which coacts with a tongue opening 58 formed
in the housing 50 of the clipper head 16. While the tongue and
mating opening are formed to facilitate movement of the tongue into
the opening and to provide a coupling that inhibits relative
movement between the casing and the housing in any direction except
movement of the casing and housing toward and away from each other,
it can be appreciated that the tongue may be otherwise formed.
Further, the tongue provides a guiding movement and alignment of
the clipper head to the power unit in a similar fashion as the
guide pins 41 and pilot pin holes 59 which are formed in the
clipper housing 50.
The moveable blade 60 of the clipper head has attached thereto a
yoke 61 which coacts with the eccentric cam drive member 26 as a
coupling to effectively connect the motor of the power unit to the
movable clipper blade. The eccentric cam drive member 26 is sized
with respect to the yoke 61, such that it will reciprocate the
movable cutter blade 60 in the directions designated by the
double-ended arrow 62 during driving of the motor.
A massager head 70 (FIGS. 9 and 10) may be readily mounted on the
power unit 15 in place of the clipper head 16 so as to convert the
appliance into a massager for facial, scalp or muscle treatment.
The massager head 70 includes a housing 71 having mounted therein
and extending therefrom a shaft 72 which is pivotally mounted to
the housing by means of a pivot pin 73. Within the housing a yoke
74, positioned and suitably connected to the inner end of the shaft
72, is sized to coact with the eccentric 26 whereby driving of the
eccentric will cause oscillation of the yoke and shaft 72. The yoke
74 receives and coacts with the eccentric drive cam member 26 when
the massager head 70 is attached to the power unit 15, whereby
driving the power unit imparts an oscillating movement to the shaft
72 about the pivot pin 73. In order to dampen movement of the yoke
and shaft to reduce noise, a damper pad 75 of a suitable resilient
material, such as foam plastic, is mounted within the housing 71
and against which the yoke and shaft are driven when they are
oscillated relative the pivot pin 73. As particularly illustrated
in FIG. 10, spring clip sockets or holes 76 are provided in the
massager head housing 71 to receive the spring clips 40 of the
power unit for locking the massager head to the power unit in the
same manner that the clipper head 16 coacts with the power unit.
Similarly, pilot pin holes 77 and a tongue opening 78 are provided
in the massager head housing 71 to respectively receive the guide
pins 44 and the tongue 57 of the power unit casing, so that the
mounting of the massager head on the power unit is guidably
accomplished in order to correctly align the yoke 74 with the
eccentric cam drive member 26. A conventional rubber massaging cup
79 is shown mounted on the end of the massager drive shaft 72, but
it may be appreciated that any type of massaging tool may be used
and easily substituted for the cup 79. This interchangeable head
may be attached and detached in the same manner as the clipper
head.
Another form of interchangeable head is illustrated in FIGS. 11-13
in the form of a scissors head 85 which may be used to cut
materials such as cloth or paper. The scissors head includes a
housing 86, one end of which is attached to be mounted on the power
unit and the other end of which includes the working end. The
scissors includes a fixed blade 87 suitably secured to one end of
the housing and having pivotally mounted thereto a movable blade 88
on a pivot shaft 89 extending from the fixed blade. The movable
blade 88 includes a drive arm 90 extending within the housing and
having mounted on the end thereof a yoke 91. As in the other
interchangeable heads, the yoke 91 is sized to coact with the
eccentric drive cam member 26, wherein driving of the power unit
causes an oscillation of the movable blade 88 about the pivot shaft
89 and a coaction between the stationary and movable blades of the
scissors to effect a cutting action on any material entering the
cutting bite. A resilient damper pad 92, similar to pad 75, is
mounted within the housing 86 to dampen movement of the movable
blade arm 90 and to reduce noise in the same manner as already
described in connection with the massager head 70. When using the
scissors on material lying on a flat surface, in order to prevent
marring of the surface, a guard 93 of a suitable soft material such
as nylon or the like is mounted on hte fixed blade 87. As seen
particularly in FIG. 12, a coil spring 94 is provided on the pivot
shaft 89 in order to bias the movable blade 88 against the fixed
blade 87 so that the cutting edges are mounted in cutting
engagement during operation of the scissors.
Similarly, with respect to the clipper attachment 16 and the
massager attachment 70, the scissors attachment housing 86 is
provided with spring clip sockets or openings 95 coacting with the
spring clips 40 of the power unit, pilot pin holes 96 coacting with
the guide pins 44 of the power unit and a tongue opening 97
coacting with the tongue 56 of the power unit, in order to guide
attachment of the scissors head to the power unit and to assure
interaction between the yoke 91 and the eccentric cam drive member
26. Thus, the scissors head 85 may likewise be easily attached or
detached from the power unit 15 as desired.
It will be understood that modifications and variations may be
effected without departing from the scope of the novel concepts of
the present invention, but it is understood that this application
is to be limited only by the scope of the appended claims.
* * * * *