US3747594A - Portable electric appliance - Google Patents

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.

Description

United States Patent 11 1 1111 3,747,594

Bishop 4 1451 July 24,1973

[ PORTABLE ELECTRIC APPLIANCE 3,075,519 H1963 [75] Inventor: Walter F. Bishop, Bloomingdale, Ill. 2572777 10/ I951 [73] Assignee: A. F. Dormeyer Manufacturing Co., Primary Examiner-Lawrence W. Trapp Chicago, Ill. Attorney-Lloyd L. Zickert [22] Filed: Nov. 19, 1971 [21] Appl. No.: 200,374

[57] ABSTRACT The appliance includes a hand-held motor unit with a motor output end for receiving a plurality of inter- 52 11.5. C1. 128/49, 30/439 changeable working tool eads wherein themotor 51 1m. (:1 A6lh 7/00 transmits p r t he heads for Operating same. An [58] Field of Search 128/48, 49, 32, 51, eccentric is provided on the Output shaft of the motor 3 52; 30 247 4392 439 for engagement with a yoke on a work tool head to convert rotary motion of the motor to reciprocating or os- 5 References Ci cillating motion. A releasable clip engages with socket UNITED STATES PATENTS means on the heads for attaching and retaining the 1 h 2,253,195 8/1941 Oster 30/4392 head p ace t 6 motor 3,631,596 l/l972Glaus 4 Claims, 13 Drawing; Figures Patented July 24, 1973 1. WWW

Patented July 24, 1973 3 Sheets-Sheet 2 FIGJ FIGJO Patented Jul 24, 1973 3 Sheets-Sheet FIG."

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PIC-5J3 PORTABLE ELECTRIC APPLIANCE 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 econ omy is enjoyed where a single power unit can be uti lized 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 powerunit.

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. l7, the appliance of the invention includes generally apower unit 15 and adetachable 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 thesame 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 detachablehair 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 thepower 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.

Thepower unit 15 includes a casing preferably molded of a suitable plastic material having abase 17 and acover 18 coacting to define a chamber within which amotor 19 is mounted having anoutput shaft 20. Apinion drive gear 21 is carried on themotor shaft 20 and in meshing engagement with a larger pinion drivengear 22, which is in turn mounted on aneccentric shaft 23. A metal sleeve bearing 24 press fit in a hole formed in thesupport flange 25 bearingly supports theeccentric shaft 23. The support flange is integrally molded with the casing base. An eccentricdrive cam member 26 is mounted on theeccentric shaft 23 whereby rotation of the shaft causes the drive member to move eccentrically relative to the shaft.

Terminal pins 30 connected to themotor 19 throughconductors 31 enable a removable plug-in cord assembly to be used for connecting the motor to a source of electrical energy. Aslide 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 thepower unit 15 wherein a pair ofspring clips 40 are secured to thesupport flange 25 byguide pin studs 41. Thespring clips 40 are formed on the opposite ends of abase plate 42 which is secured flush against thesupport flange 25 in a properly oriented relationship with respect to theeccentric drive cam 26. The stud portion of each guide pin stud extends through thebase plate 42 and through thesupport flange 25 to a seated position defined by a shoulder 43, thereby leaving theguide pin portion 44 protruding from thebase plate 42. The inner ends of the guide pin studs are deformed to lock the studs in place wherein the studs thereby take the fonn of a rivet to fasten thespring clips 40 in place on thesupport flange 25 of the casing. As seen particularly in FIG. 7, the housing 50 of theclipper head 16 is formed with ajunction face 51 that meets with thepower output unit 15 and in which is provided spring clip sockets orholes 52 formed with notches or shoulders 53 (FIG. 8) which coact with the spring clips to lock thehead 16 onto the power unit as seen in FIG. 8. Thespring clip holes 52 are of sufficient size to permit expansion of thespring clips 40 as they are forced into the holes and wherein the spring clips come together to lock on theshoulders 53 when they have seated as shown in FIG. 8. Detachment of thehead 16 from thepower unit 15 is easily accomplished by separating the head from the power unit which causes spreading of thespring clips 40 so that they ride over theshoulders 53 as the clips are retracted from theholes 52.

To further orient an interchangeable head with respect to the power unit, atongue 57 is integrally formed on thesupport flange 25 of the power unit casing which coacts with a tongue opening 58 formed in the housing 50 of theclipper 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 theguide pins 41 andpilot pin holes 59 which are formed in the clipper housing 50.

Themoveable blade 60 of the clipper head has attached thereto ayoke 61 which coacts with the eccentriccam drive member 26 as a coupling to effectively connect the motor of the power unit to the movable clipper blade. The eccentriccam drive member 26 is sized with respect to theyoke 61, such that it will reciprocate themovable cutter blade 60 in the directions designated by the double-endedarrow 62 during driving of the motor.

A massager head 70 (FIGS. 9 and may be readily mounted on the power unit in place of theclipper head 16 so as to convert the appliance into a massager for facial, scalp or muscle treatment. Themassager head 70 includes ahousing 71 having mounted therein and extending therefrom ashaft 72 which is pivotally mounted to the housing by means of apivot pin 73. Within the housing ayoke 74, positioned and suitably connected to the inner end of theshaft 72, is sized to coact with the eccentric 26 whereby driving of the eccentric will cause oscillation of the yoke andshaft 72. Theyoke 74 receives and coacts with the eccentricdrive cam member 26 when themassager head 70 is attached to thepower unit 15, whereby driving the power unit imparts an oscillating movement to theshaft 72 about thepivot pin 73. In order to dampen movement of the yoke and shaft to reduce noise, adamper pad 75 of a suitable resilient material, such as foam plastic, is mounted within thehousing 71 and against which the yoke and shaft are driven when they are oscillated relative thepivot pin 73. As particularly illustrated in FIG. 10, spring clip sockets or holes 76 are provided in themassager 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 theclipper head 16 coacts with the power unit. Similarly, pilot pin holes 77 and atongue opening 78 are provided in themassager head housing 71 to respectively receive the guide pins 44 and thetongue 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 theyoke 74 with the eccentriccam drive member 26. A conventionalrubber massaging cup 79 is shown mounted on the end of themassager drive shaft 72, but it may be appreciated that any type of massaging tool may be used and easily substituted for thecup 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 which may be used to cut materials such as cloth or paper. The scissors head includes ahousing 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 fixedblade 87 suitably secured to one end of the housing and having pivotally mounted thereto amovable blade 88 on apivot shaft 89 extending from the fixed blade/Themovable blade 88 includes adrive arm 90 extending within the housing and having mounted on the end thereof ayoke 91. As in the other interchangeable heads, theyoke 91 is sized to coact with the eccentricdrive cam member 26, wherein driving of the power unit causes an oscillation of themovable blade 88 about thepivot 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. Aresilient damper pad 92, similar topad 75, is mounted within thehousing 86 to dampen movement of themovable blade arm 90 and to reduce noise in the same manner as already described in connection with themassager head 70. When using the scissors on material lying on a flat surface, in order to prevent marring of the surface, aguard 93 of a suitable soft material such as nylon or the like is mounted on hte fixedblade 87. As seen particularly in FIG. 12, acoil spring 94 is provided on thepivot shaft 89 in order to bias themovable blade 88 against the fixedblade 87 so that the cutting edges are mounted in cutting engagement during operation of the scissors.

Similarly, with respect to the clipper attachment l6 and themassager attachment 70, thescissors attachment housing 86 is provided with spring clip sockets oropenings 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 atongue 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 theyoke 91 and the eccentriccam drive member 26. Thus, thescissors head 85 may likewise be easily attached or detached from thepower 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.

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 easing 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 carriedby the housing, and said yoke means being mounted on the shaft, whereby oscillating motion is ap plied to the shaft.

3. A portable electric appliance: as defined inclaim 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.

Claims (4)

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.

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