CA1045367A - Electric clipper - Google Patents

Abstract

ABSTRACT OF DISCLOSURE
Disclosed herein is a hair clipper including a housing, a motor located in the housing and having a rotatable shaft including a first portion and an end portion projecting from the first portion in eccentric relation to the rotary axis of the first portion, a drive member mounted in co-axial, surrounding relation to the end portion for relative rotation therebetween, and means retaining the drive member on the end portion.

Description

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TITLE
,~ ELECTRIC CLIPPER
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; NVENTOR
RICHARD L. URBUSH
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RELATED AEtPLICATION
This application is a division of application Serial No. 250,533, filed April 20, 1976.

BACKGROUND OF THE INVENTION
The invention relates generally to hair clippers `
t 10 and to electrically operated hair clippers.
The invention also relates to arrangements for electrically insulating an electrically operated hair clipper.
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.:, The invention also relates to arrangements for ~,,! reciprocating the movable blade o~ a hair clipper blade set in response to rotary movement of the output sha~t of ~'lZ an electric motor.
The invention also relates to spring arrangements ; `
, . . . . .for releasably and selectively retaining a blade set holding . tongue or pivot arm in an operating position and in a second ,', 20 position affording connection and disconnection of the blade ~;, set relative to the tongue or pivot arm.
' The invention also relates to arrangements ~or preventing relative movement between the stationary blade o~ a blade set and a blade set mounting tongue or pivot arm.
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SU~DMARY OF THE INVENTION
The invention provides a hair clipper including a `
housing, a motor located in the housing and having a rotatable ':
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53~7 . .
shaft including a first portion and an end portion projecting from the first portion in eccentric relation to the rotary axis of the first portion, a drive member mounted in co-axial, surrounding relation to the end ~ 5 portion for relative rotation therebetween, and means - retaining the drive member on the end portion.
In one embodiment in accordance with the invention, the means securing the nose element on the end portion includes a tapered nose element having a base engaging i 10 th e drive member, and means securing th ~ nose element . .:
on t he end portion.
- In one embodiment in accordance with the invention, the ,~ means securing the nose element on the end portion includes a threaded projecting stud on one of the nose element and the end portion, and a threaded recess receiving the threaded stud on the other of the end portiGn and the recess.
~;! In one embodiment in accordance with the invention, the nose element is fabricated of plastic material.
In one embodiment in accordance with the invention, ` 20 the nose element is secured on the end portion for common 'l rotation of the nose element and the end portion.
In one embodiment in accordance with the invention, the hair clipper also includes an annular bearing between ~,i ' and engaging the end portion and the drive member to afford `~, 25 relative rotation therebetween.
~ In one embodiment in accordance with the invention, ;~ the invention provides a hair clipper comprising an outer ~ housing of electrically insulating material, a motor ; located in the housing and including a field structure, , .. ` .

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. an armature structure inc].uding a shaft having a first portion and an end portion projecting from the first portion in eccentric relation to the axis .. of the first portion, bearing assemblies spaced . 5 axially of the armature structure and engaging the . armature structure and the field structure for rotatably supporting the armature structure for . rotation relative to the field structure, each of the bearing assemblies including a bearing and a :
bearing sleeve fabricated of electrically insulating material and located to isolate the bearing from one ~
,s of the armature structure and the field structure, .
one of the bearing asse~..blies being engaged with the ,. .
. first portion of the shaft, means connecting the ~:~
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~ 15 field structure and the outer housing, a drive member . . .
~, located in co-axial, surroundi.ng relation to the .
'.~ end portion of the shaft, an annular bearing between .r ~ .
tl and engaging the end portion and the drive member '~ to afford relative rotation therebetween, and means ^, 20 retaining the drive member on the end portion in co-axial, surrounding relation to the end portion -~ including a tapered nose element having a base engaging ..
the drive member, and means securing the nose element .
on the end portion. . ' .';. ~ ,.

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` ~ 367 Ot~lcr ~ea~ur~s and aclval1~a~rcs of the eml~odilllcnts of the inven~ion ~ill becomc known by rcL~renc~ to the following drawin~s, general description, and claims.
T}IE D1~WINGS
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Fig. 1 is a side elevational view, partially broken away and in section, of a hair clipper embodying various of the features of the invention.
~ Fig. 2 is an enlarged front view of the hair clipper I shown in Fig. 1 with the blade set removed.
- Fig. 3 is a top plan view of the blade set incorporated in the hair clippe~ shown in Fig. l.
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Fig. 4 is a top plan view showing the drive arrange-; ment ~or the blade set incorporated in the hair clipper shown , in Fig. lo . j 15 Fig. 5 is a fragmentary ~ide elevational view, partia11y broken away and in section, of the drive arrangement for the ¦ blade set incorporated in the hair clipper shown in Fig. l.

¦ Fig. 6 is a sectional view taken along line 6--6 3 of Fig. S.
Fig. 7 is a sectional view taken along line 7--7 of Fig. 5.

Fig. 8 is a cross sectional view taken along line 8--8 ;
of Fig. 9.

Fig. 9 is a side elevational view of a blade member . 25 incorporated in the blade set included in the hair clipper shown in Fig. 1.
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! _4_ ; ;! ~ogs~67 ¦ Be~orc e~plaining ~he embodiments of the invention in `: detail, it is to be understood that the invention is not limited in its application to the details of cons~ruction and the arrange-. ments of the components set forth in the following description or illustrated in the dra~ings. The invention is capable of . other embodiments and of being practiced and carried out in . various ways. Also, it is to be understood that the phrase- ¦
. ology and terminology employed herein is for the purpose of .
....
: description and should not be regarded as limiting.
10 GENERAL DESCRIPTION :.
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Shown in the drawings is an electrical ha~r clipper 11 which embodies various of the features of the invention ~;¦ and which includes a housing 13 which is constructed of : :
electrically insulating material~ such as plastic. ~ny .
i 15 suitable design can be employed and, in the illustrated :
construction, the housing comprises t~o sections or parts 17 ~ and 19 which are connected together by a plurality of screws :1 21.
I Located in the housing 13 is an electrical motor -.l 20 21 which can be of various designs but which; pre~erably, I
~ . is an alternating current permanent magnet motor. Thus, ~., the motor 21 includes a field structure 23 which includes , .l one or more permanent magnets but which is without electrical connection to a source of power. The field :........................................................................ I " .
25 struc~ure 23 is secured to and retained in the housing j .
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. 13 to provide a housing assembly 24 .

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~1 by r~ason of eng~gement with a pair of upstanding bos.ses 25 .. ;l which respectively threadably receive two of the screws 21 and , i ¦ by reason of an additional screw connec~ions 27 between the ;:i field structure 23 and dne of the housing sections 17 and 19.
.~ S RotabLy m~unted within the field structure 23 is , : an armature structure 31 including a shaft 33 having two axially spaced portions 34 and 35, a winding 36 carried by ~:
the shaft 33 between the portions 34 and 35, and a split ~ comuta~or ring 37 which is also carried by the shaf~ 33 be- .
.. 10 tween the portions 34 and 35 and electrically connected to the winding 36. .
. Means are provided for rotatably mounting the armature . structure 31 within the field structure 23 while, at the same time, electrically isolating and resiliently mounting the arma- ¦
ture structure 31 from the field structure 23. While various arrangements can be employed, in the illustrated construction, such means comprises two axially spaced bearing assemblies 41 ~ which extend between the field structure 23 and the armature ¦ shaft portions 34 and 35 and which respectively include a .¦ 20 bearing 43 and a bearing sleeve 45.
¦ ~he bearing sleeves 45 are constructed of electrically Il insulating material and, while the bearing sleeves 45 ~an be .1 located between the bearings 43 and either of the armature shaft 33 and the field structure 23, it is preferred to locate the bearing sleeves 45 between the bearings 43 and the field :.!
.:l structure 23 and to have the bearings 43 operatively engaged i .
~ with the armature shaft portions 34 and 35. Pre~erably, the .,, j . , ; -6-1 ", !
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~ i367 - bearing sl~v~s 45 ~aLe o rubl~er or rul~e~r-like ma~erial : to permit compression during assembly, thus accommodating : more liberal manufacturing tolerances.
~: In addition, the field structure 23 is fabricated : 5 to support a pair of brush assemblies 5L which are diametrically, .~ oppositely located,wlich are operatively engaged with the . split iromutator ring 37, and which are elec~rically connected . to a pair of suitable electrical leads 53 which enter into 1!
the housing 13. It is noted that these electrical connec~ions ~; 10 are spaced from the ~ield structure 23 and cons~itute the only ,, : connections of the.motor 21 to a source of current.
.: More particularly, the field structure 23 includes : two diametrically opposite bores 55 which respectively receive .
brush sleeves 57 of insulating material, such as plastic. The ,,~ , brush sleeves 57 are retained in the bores 55 of the field ;'.~ structure 23 by suitable means, such as set screws 59 and .
.. contain carbon brushes 61 and metalic brush holders 63 ,.,, . ,.
. which are electrically connected to the electrical lea~s 53 , In the illustrated construction, the brush sLeeves 57 :
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extend outward through registering apertures 65 in the housing 13 ; ~ ~:
. and are closed by caps or closures 67 which are respectively ........... received in the brush sleeves 57 and which additionally serve `!' to urge respective brush springs 69 against the brushes 61. .:.
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. ~ Located at one end of the housing 13 is a blade set 71 . 25 which includes a ~ixed blade or shear plate 73 fixed relative to ~il the housing 13 and field structure 23 and a movable blade, plate .¦ or comb 75 reciprocable on and relative to the fixed plate 73.
~3 In this last regard, the blade set 71 preferably includes ~ 7 ''I' .-. .

I ~S367 suital)le mealls for ~ iding ~ ecipLocation of the movable g bl~de 75 r~lative to ~lle fixed bla~le 73. The mov~ble bla~le 75 ¦ includes a generally fLat blade member or plate 17~ which includes ~orwardly and rearwardly co-planar Lower surfaces 177 which bear 5 against the fixed blade 73, an upper surLace 179, a forward .
edge 183 with a series of teeth 185 coopcrating with tee~h on the ~orward edge of the fixed blade 73 3 and a rearward ~dge or . surface 187 which preferably extends ;n generally perpendicular . relation to the lower and upper surfaces 177 and 179. Located ,: . . , .
. 10 centrally of the blade member 179 is a recess 189 which extends from the upper surface 179, which can either be blind or extend .¦ completely through the blade member L75, and which includes two 1 laterally or transversely spaced edges or walls 191 extending in : generaLly perpendicular relation to the forward and rearward ~ L5 edges 183 and 185.
: The movable blade 75 includes means for engaging the . armature shaft 33 for reciprocating the movable blade 75 in r~s~ns~
to rotation of the armature shaft 33 while, at the same time, ; electrically insulating the movable blade 75 from the armature . 20 shaft 33.
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In this last regard, the movable blade 75 has ~ixedly extending therefrom an element which is driven by tlle arma~ure i. shaft 33 and which is in the form of a yoke member 81 which is . preferably constructed of electrically insulating material, . 25 such as plastic, and which includes a main portion which, in part,is located in the recess 191, and is generally of U-shape including first and second laterally spaced arms or walls 83 ~hich extend ,:~ . ,.' ~LQ453 E;~
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::~; upwardly from the edges 191 of the recess, together with a connecting web or wall 197 which extends between the lower edges of the walls 83 ~,~` and is located in the recess l91o The arms or walls 83 respectively .;~ include rearwardly and upwardly extending edge por~ions or ma.rgins , having arcuately laterally outwardly flaring terminal portions 85 .
., extending toward the armature shaft 33 The yoke member 81 also includes first and second flange portions 201 which respectively extend in laterally outward co-planar ! relation from the first and secGnd walls 83 in overlying ~ngagement with the upper surface 179 of the blade member 1750 : The movable blade 75 also includes a brace member 211 . ~ :
which is preferably constructed of metal, such as spring steel, ;:
and which includes first and second laterally spaced parallel .. wall portions 213 located in laterally outwardly overlying relation . to the walls 83 of the yoke member 81. Preferably, the wall portions - 213 of the brace member 211 are co-extensive with the walls 83 of ;
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the yoke member 81 above the flange portions 2010 In addition, the . .
~ brace member 211 includes a bridge portion 215 which unites the ,:
-~ wall portions 213 iand which extends laterally therebetween from the forward edges of the wall portions 213 and above the lower edges of ,.. .
the wall portions 213 and forwardly of the forward edges of the walls 83 of the yoke member 81. `~
` The brace member 211 further includes flange portions 217 -~ which respectively Gxtend laterally outwardly and in co-planar .
;, relation from the lower edges of the wall portions 213 and in over-lying engagement with the flange portions 201 of the yoke membçr 81. .
In addition, the brace member 211 includes laterally spaced tabs 219 -:' which extend respectively from the rearward edges of the flange por-tions 217 in generally perpendicular relation thereto and in overlying engagement with the rearward surfaces 187 of the blade member 1750 . :
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. In addition9 the movable blade 75 preferably includes a ~ reinforcing member 221 which is fabrica~ed of metal, such as spring ;: steel. The reinforcing member 221 includes an elongated portion 223 ~" which overlies the spaced tabs 219 of the brace member 211, ~ogether with a pair of laterally spaced flange portions 225 which extend from the upper edge of the elongated portion 223 in generally per-pendicular relation thereto and in overlying engagement with the flange portions 217 of the brace member 211.
Means are provided for fixedly securing together the ::
blade member 175, ~he yoke member 81, the brace member 211, and the reinforcing member 221. While various arrangements can be employed, in the illustrated construction, such means comprises a pair of rivets 231 which extend through the flange portions 225 of the reinforcing member 221, through the flange portions 201 of the yoke member 81 , and through the body of the blade member 1750 Extending between the arms or walls 83 for engagement , therebetween is an annular drive shaft member 91 which is driven by the armature shaft 33, which is preferably of metallic construction, ; such as stainless steel, and which has an outer surface in engagement with and between the arms 83. The drive member 91 also includes :
an inner surface in engagement with a bearing 93 which, in turn, is ; engagad on a portion 95 of the armature shaft extending in eccentric ~- relation to the adjacent armature shaft portion 34 supported by one of the bearing assemblies 41. Preferably the bearing 93 is a ball , bearing.
;, :, .i The annular drive member 91 is retained on the shaft ~;~
;` portion 95 by a nose element or member 97 which is preferably constructed of electrically insulating material, such as plastic, and which is generally conical in shape so as to ' 3Q guide entrance of the nose member between the yoke arms 83 -; and which has a base with a diameter approximately equal to .
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.~. the outer diameter of the drive member 91 so as to restrain f axial out~ard movement of the driv~ member ~l into engagement between the arms 83.
Suitable means are provided for re~aining ~he nose . $ member 97 on the end o~ the eccentric arma~ure shaft portion 95.
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. While various arrangements could be employed, in the illustrated ~ ~-j construction, such means comprises a threaded s tud on one o~ :
.¦ the nose member 97 and the eccentric armature shaft portion 95 . -and a ~hreaded recess receiving the stud on the other of the ~ ~ :
. L0 nose member 97 and the shaft portion 95. Specifically, in : the illustrated construction, the eccentric shaft portion 95 ~ includes a threaded projection 99 and the nose me~ber 97 includes :~1 a threaded recess 101 receiving the threaded projection 99.
The connection of the blade set 71 and particularly the ~ 15 fixed blade 73, to the housing 13 and field strueture 23 permits ¦ releasable attachment of the blade set 71 on the hair clipper 11.
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~ In this regard, the blade set at~achment means comprises a i! bracke~ 111 which is fixed on the stationery blade.or shear plate 73 and which includes a raised central portion 113 defining between the bracket 111 and the shear plate 73, a groove or slo~ 115 adapted to receive a tongue or pivot arm 117 carried on a mounting plate 119 fixed to one or both of the housing 13 and field structure 23 by suitable means, such as a .,,; .
î pair of screws i21. Further in this last regard, the tongue .~
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~i~ 25 or pivot arm 117 is carried by the mounting plate ll9 about a ....
!"'. hin~e pin 123 ~or movement betwecn a first position ~fording ~ . .
insertion and with~ra~al o~ ~hc tongue 117 rela~ive ~o the ~ . , .
groovc or slo~ 115 and ~n opc~tin~ position in whicll thc ~l~dc , ~
.. :

~53~7 :~ set 71 is located for engagement of the rotable annular . drive member 91 between the yoke arms 83. As indicated earlier, during movement of the tongue 117 from the first position to the operating position, the flared terminal portions 85 ~f the yoke arms 83 and the con~cal shape of the nose member 97 facilitate insertion of the drive member 91 between the yoke arms 83.
Means are provided for selectively and releasably retaining the pivot arm or tongue 117 in either of the first and operating positions. While various arrangements are possible, in the illustrated construction, the tongue or pivot arm 117 includes rearwardly of the hinge pin 123, an upwardly .~ extending ~lange 131 which is engaged by a downwardly convex end portion 133 of a biasing spring 135 which is fixed to the top of a raised central portion 137 of the mounting plate 119.
~. In operation, engagement of the curved portion 133 of the ~ spring 135 with the flange 131 serves to releasably retain the tongue or pivot arm 117 in either of the first or operating positions.
Means are provided on one or both of the ield struc-~rl ture 23 and housing 13 for augmenting the action of the biasing spring 135. In this regard, in the illustrated constnuction, the housing 13 is formed to expose the field structure 23 which, in turn, is provided with a recess 139 which receives a helical .
-.~ compression spring 141 which, at its outer end, bears against . the tope side of the downwardly convex portion 133 of the biasing spring 135 so as to increase the force applied by the biasing . ~ :
;: spring 135 to releasably hold the tongue or pivot arm 117 in .:
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3 ~ 7 either o~ i.ts two positions. Employment of the helical : .
spring 141 also serves to parti.ally relieve the loading on the biasing spring 135 and to thereby increase the life of :~
the biasing spring 135. If desired, as already indicated, the 5 helical spring 141 could be contained in a recess in the . housing 13.
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The mounting plate 119 also has fixed, on the upper ;: surface of the raised central portion 137, a spring retainer 143 which is adapted to grasp the central portion 113 of the :
, : .
. 10 bracket 111 on the stationary blade 73 to releasably prevent relative movement between the tongue or pivot arm 117 and : the stationary blade 73. In this regard, the spring :~ retainer 143 is fixed on the mounting plate by a rivet 145 : which also fixes the biasing spring 135.
l 15 In order to releasably grip the stationary blade bracket 111, the spring retainer 143 includes an outer lip 151 which is adaptPd, when the ~lade set 71 is received on the tongue 117, to grip the edge of the stationary blade bracket 111 remote from the hinge pin 123 so as to releasably clamp or grip the stationary blade bracket 111 against a shoulder 153 formed on the tongue 117 adjacent to the l hinge pin 123.
j In addition, the spring retainer 143 includes two laterally spaced wings 161 which are adapted to releasably grip t~ 25 or clamp therebetween the side edges 163 of the raised central ~ portion 113 of the stationary blade bracket 111 so as to prevent ,l lateral movement of the stationary blade 73 relative to the :~ tongue 117 while, at the same time, avoiding interference with , ease o~ insertion and withdrawal of the tongue 117 relative to :.
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53~7 thc groov~ 115. In this regard) it is no~cd that withdrawal and inse~tion o~ tlle tongue 117 relative to the groove 115 occurs when the tongue or pivot arm 117 is in the first .
.~ position and that the spring retainer 143 releasably grips the $ raised central portion 113 of the stationary blade bracket 111 ' incident to movement of the tongue 117 to the operating position~

.` Thus, when.the tongue 117 is in the operating position, . the stationary blade 73 is ~irmly but releasably held stationary .

:;. relative to the field s~ruc~ure 23 and housing 13 as a result of ., .
10 the spring retainer 143 releasably cLamping the stationery ~ blade 73 to ~he tongue 117 and as a result o~ the action of - ~he springs 135 and 141 which firmly but releasably hold the tongue or pivot arm 117 in the operating position. In addition, when the tongue is in the first position, the tongue 117 ;
.i 15 can be easily inserted or withdrawn from the groo~e 115 on the stationary blade 73.
It is no~ed that the mo~or is double insulated ~rom the user as both the bearing sleeves 45 and the housing 13 ::J
~ ser~ve to electrically insulate the armature structure 31 ~rom ..
., 20 the hand of the user holding the hair clipper 11. In addi~ion, ; the drive from the armature structure 31 to the blade set 71 .. ..
is electrically insulated as the annular drive member 91 operatively engages the plastic yoke member 81. Still further, ~r`~ wear is reduced due to engagement of the metaLlic drive member 41 ~.~ 25 with the plas~ic yoke member 81 and because the annul~r drive ~:
!~,,.;', member 91 is ~reeLy rotat~ble on the ecccntric portion 95 o~
rl thc armature shaft 33.
Various o~ tlle ~eaturcs o~ the inv~ntion are s~t ~or~h -in tlle followin~ cl~ims. :-

Claims (26)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A hair clipper including a housing, a motor located in said housing and having a rotatable shaft including a first portion and an end portion projecting from said first portion in eccentric relation to the rotary axis of said first portion, a drive member located in co-axial, surrounding relation to said end portion, an annular bearing between and engaging said end portion and said drive member to afford relative rotation therebetween, and means retaining said drive member on said end portion in co-axial, surrounding relation to said end portion.

2. A hair clipper in accordance with Claim 1 wherein said drive member has an outer diameter and wherein said means retaining said drive member on said end portion in co-axial, surrounding relation comprises a tapered nose element having a base with a diameter approximately equal to said outer diameter of said drive member, and means securing said nose element on said end portion.

3. A hair clipper in accordance with Claim 2 wherein said nose element is secured on said end portion for common rotation of said nose element and said end portion.

4. A hair clipper in accordance with Claim 2 wherein said means securing said nose element on said end portion includes a threaded projecting stud on one of said nose element and said end portion, and a threaded recess receiving said threaded stud on the other of said end portion and said recess.

5. A hair clipper in accordance with Claim 2 wherein said nose element is fabricated of plastic material.

6. A hair clipper in accordance with Claim 1 wherein said bearing comprises a ball bearing.

7. A hair clipper including a housing, a motor located in said housing and having a rotatable shaft including a first portion and an end portion projecting from said first portion in eccentric relation to the rotary axis of said first portion, a drive member mounted in co-axial, surrounding relation to said end portion for relative rotation therebetween, and means retaining said drive member on said end portion including a tapered nose element having a base engaging said drive member, and means securing said nose element on said end portion.

8. A hair clipper in accordance with Claim 1 wherein said motor includes a field structure fixed to said housing, and further including a blade set connected to one of said housing and said field structure and including a first blade fixed relative to one of

Claim 8 (Cont'd) said housing and said field structure, a second blade movable relative to said first blade and including thereon a driven element formed of electrically insulating material and engaged by said drive member to cause reciprocating movement of said second blade relative to said first blade in response to rotation of said shaft.

9. A hair clipper in accordance with Claim 1 wherein said motor comprises a field structure fixed to said housing and including two diametrically opposed bores, respective brush sleeves formed of electrically insulating material located in said bores, and respective brush assemblies located in said brush sleeves.

10. A hair clipper in accordance with Claim 9 wherein said housing includes two diametrically opposed apertures and wherein said brush sleeves extend into said apertures to afford access to said brush assemblies from the exterior of said housing.

11. A hair clipper in accordance with Claim 9 wherein a pair of electrical wires are respectively connected to said brush assemblies interiorly of said housing and comprise the only electrical connection to said motor.

12. A hair clipper in accordance with Claim 1 and further including an annular bearing between and engaging said end portion of said drive member.

13. A hair clipper comprising an outer housing of electrically insulating material, a motor located in said housing and including a field structure, an armature structure including a shaft having a first portion and an end portion projecting from said first portion in eccentric relation to the axis of said first portion, bearing assemblies spaced axially of said armature structure and engaging said armature structure and said field structure for rotatably supporting said armature structure for rotation relative to said field structure, each of said bearing assemblies including a bearing and a bearing sleeve fabricated of electrically insulating material and located to isolate said bearing from one of said armature structure and said field structure, one of said bearing assemblies being engaged with said first portion of said shaft, means connecting said field structure and said outer housing, a drive member located in co-axial, surrounding relation to said end portion of said shaft, an annular bearing between and engaging said end portion and said drive member to afford relative rotation therebetween, and means retaining said drive member on said end portion in co-axial, surrounding relation to said end portion including a tapered nose element having a base engaging said drive member, and means securing said nose element on said end portion.

14. A hair clipper in accordance with Claim 13 wherein said field structure includes a permanent magnet.

15. A hair clipper in accordance with Claim 13 wherein said bearing sleeves are located between said bearings and said field structure.

16. A hair clipper in accordance with Claim 13 wherein said bearing sleeves are fabricated of resilient material.

17. A hair clipper in accordance with Claim 13 and further including a blade set connected to one of said housing and said field structure and including a first blade fixed relative to one of said housing and said field structure, a second blade movable relative to said first blade and including thereon a driven element formed of electrically insulating material and engaged by said drive member to cause reciprocating movement of said second blade relative to said first blade in response to rotation of said shaft.

18. A hair clipper in accordance with Claim 13 wherein said field structure includes two diametrically opposed bores, respective brush sleeves formed of electrically insulating material located in said bores, and respective brush assemblies located in said brush sleeves.

19. A hair clipper in accordance with Claim 18 wherein said housing includes two diametrically opposed apertures and wherein said brush sleeves extend into said apertures to afford access to said brush assemblies from the exterior of said housing.

20. A hair clipper in accordance with Claim 18 wherein a pair of electrical wires are respectively connected to said brush assemblies interiorly of said housing and comprise the only electrical connection to said motor.

21. A hair clipper in accordance with Claim 13 wherein said shaft includes a first portion engaged with one of said bearing assemblies and an end portion projecting from said first portion in eccentric relation to the rotary axis of said first portion, and further including a drive member located in co-axial, surrounding relation to said end portion, an annular bearing between and engaging said end portion and said drive member to afford relative rotation therebetween, and means retaining said drive member on said end portion in co-axial, surrounding relation to said end portion.

22. A hair clipper in accordance with Claim 13 wherein said nose element is secured on said end portion for common rotation of said nose element and said end portion.

23. A hair clipper in accordance with Claim 13 wherein said means securing said nose element on said end portion includes a threaded projecting stud on one of said nose element and said end portion, and a threaded recess receiving said threaded stud on the other of said end portion and said recess.

24. A hair clipper in accordance with Claim 13 wherein said nose element is of plastic material.

25. A hair clipper in accordance with Claim 13 wherein said bearing comprises a ball bearing.

26. A hair clipper including a housing, a motor located in said housing and having a rotatable shaft including a first portion and an end portion projecting from said first portion in eccentric relation to the rotary axis of said first portion, a drive member mounted in co-axial, surrounding relation to said end portion for relative rotation therebetween, and means retaining said drive member on said end portion.