HAIR CLIPPER WITH IMPROVED BLADE DRIVING MEANS

• US 3,812,389 A
• Filed: 11/10/1972
• Issued: 05/21/1974
• Est. Priority Date: 11/10/1972
• Status: Expired due to Term

• Current Assignee: Leonard E. Bowerman
• Original Assignee: Leonard E. Bowerman
• Inventors: Bowerman, Leonard E.
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Hickey, Robert J.
• Application Number:
  US05/305,276
• Time in Patent Office: 557 Days
• Field of Search: 310/29,50,47,42,43,75R,36-38 30/210
• US Class Current: 310/29
• CPC Class Codes: B26B 19/282 Motors without a rotating central drive shaft, e.g. linear motors
• CPC Class Codes: H02K 33/04 wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation

Abstract

A hair clipper having a vibratory motor with an armature that is pivotally supported by an upright bearing is disclosed. A pair of torsion springs encircle the vertical axis of the bearing. One end of each spring is inserted into apertures in the armature and the other end of each spring bears against the housing of the clipper to bias the armature to a central position. The blade drive pin is integrally molded into the armature and a plastic ball and socket drive member is carried by the pin. The drive member is spring biased against a plastic drive shoe, which is removably secured to the upper cutting blade of the clipper. The drive shoe and the housing of the clipper have mating guiding surfaces.

Claims

1. A hair clipper comprising a two-piece elongated housing, a blade set comprising a first member and a second member, means to secure said second member to said housing, an electrical motor in said housing, blade drive means for driving said first member relative to said second member comprising force transmitting means coupled to said motor constructed to transmit a biasing force along the elongated dimension of said housing, a drive shoe positioned in abutting engagement with said drive means and secured to said first member so as to press said first and second members together in response to said biasing force, said drive shoe having a first guide surface formed thereon, said housing having a second guide surface formed thereon, said first and second guide surfaces being biased into engagement during operation of said device to maintain said first and second members in aligned cutting relationship.

2. A drive shoe and cutter blade construction for a hair clipper having a comb blade comprising a metal cutter blade having cutting teeth and openings therein and a drive shoe formed of a resilient material having segments which are removably secured in respective ones of said openings in said blade by the natural resiliency of said material, said drive shoe further having a plurality of driving surfaces located remote from said resilient segments for receiving driving and biasing forces thereon for driving said cutter blade and for biasing said cutter blade against said comb blade.

3. The drive shoe and cutter blade combination of claim 2 wherein the blade has two elongated slot openings therein and the drive shoe has two spread apart elongated segments which can be moved toward each other by a squeezing force so as to pass through the elongated slot openings of the blade and said segments are secured in said slot openings of said blade when the squeezing force on said segments is released.

4. A hair clipper comprising an elongated housing, an electric motor in said housing having a stationary field means and a vibrating armature, a blade set comprising a first member and a second member, means to secure said second member to said housing, said armature being located in said housing intermediate said field means and said blade set, a drive pin secured to said armature and projecting along the elongated dimension of said housing toward said blade set, a drive bearing having a hollow bearing section which is positioned over said drive pin and a spherical end section on the outer end of said drive bearing, resilient compressible spring means surrounding said bearing section and biasing said spherical end section toward said blade set, blade drive and biasing means comprising a spherical recess for receiving said spherical end section, said blade drive and biasing means being in engagement with said first member of said blade set so as to bias said first and second members together and so as to drive said first member in vibratory motion relative to said second member and said spherical recess having a hole therein to prevent air compression in said recess.

5. A hair clipper comprising an elongated housing, an electric motor in said housing having a stationary field means and a vibrating armature, a blade set comprising a first member and a second member, means to secure said second member to said housing, said armature being located in said housing intermediate said field means and said blade set, a drive pin secured to said armature and projectinG along the elongated dimension of said housing toward said blade set, a drive bearing having a hollow bearing section which is positioned over said drive pin and a spherical end section on the outer end of said drive bearing, resilient compressible spring means surrounding said bearing section and biasing said spherical end section toward said blade set, blade drive and biasing means comprising a spherical recess for receiving said shperical end section, said blade drive and biasing means being in engagement with said first member of said blade set so as to bias said first and second members together and so as to drive said first member in vibratory motion relative to said second member, said blade drive and biasing means comprising a drive socket having said recess therein and a separate drive shoe which is secured to said first member, said drive socket having one or more first surfaces, and said drive shoe having one or more second surfaces which are in engagement with respective ones of said first surfaces so as to transmit the forces applied to said recess by said spherical end section from said drive socket to said first member of said blade set via said drive shoe.

6. A hair clipper as set forth in claim 5 wherein said drive shoe is removably secured to said first member.

7. A hair clipper as set forth in claim 5 wherein said spherical recess has a hole therein to prevent air compression in said recess.

8. A hair clipper as set forth in claim 5 wherein said drive shoe has a first guide surface that extends from the first member of said blade set in substantially a normal direction, said housing has a second guide surface substantially parallel to said first guide surface and said first and second guide surfaces are in engagement during operation of the clipper.

9. A hair clipper as set forth in claim 5 wherein the said drive socket has a first generally trapezoidal cross-section with said first surfaces forming the sides of said first cross-section and said drive shoe is formed with a channel having a second generally trapezoidal cross-section with said second surfaces forming the sides of said second cross-section.

10. A hair clipper as set forth in claim 5 wherein said drive shoe has a first guide surface that extends from the first member of the blade set in substantially a normal direction, said housing has a second guide surface substantially parallel to said first guide surface and said first and second guide surfaces are in engagement during operation of the clipper.

11. A motorized device comprising a two-piece housing having a first housing member and a second housing member, an electric motor in said housing having a stationary field means and a vibratory armature, said first housing having a first boss and said second housing having a second boss spaced apart from said first boss, a compressible, expandable bushing positioned intermediate said first and second bosses, means to secure said first and second housing members together and to compress said expandable bushing between said first and second bosses thereby expanding the dimensions of said bushing in at least one direction, said field means having a surface at a first end thereof which is in contact with an outer surface of said expandable means when said expandable means is expanded by compression, first abutment means on said field means located near a second end of said field means, second abutment means on said housing located adjacent said second end of said field means with said field means being movable in said housing in response to the force exhibited on said first end of said field means by said expandable means so as to move said first abutment means into engagement with said second abutment means thereby locating said field means properly in said housing.

12. A motorized device as set forth in claim 11 wherein a pair of runners are provided on opposite sides of said housing so that said field means is slideable back and forth on said runners and a pair of resilient paDs are positioned intermediate said field means and said runners.

13. A motorized device as set forth in claim 12 wherein said resilient pads extend over a portion of said first end of said field means and said housing has third abutment means located such that said resilient pads are positioned intermediate said third abutment means and said first end of said field means.

14. A hair clipper comprising a two-piece housing having a first housing member and a second housing member, an electric motor in said housing, having a stationary field means and a vibratory armature, said first housing having a first boss and said second housing having a second boss spaced apart from said first boss, a compressible, expandable means positioned intermediate said first and second bosses, means to secure said first and second housing members together and to compress said expandable means between said first and second bosses thereby expanding the dimensions of said expandable means in at least one direction, said field means having a surface at a first end thereof which is in contact with an outer surface of said expandable means when said expandable means is expanded by compression, first abutment means on said field means located near a second end of said field means, second abutment means on said housing located adjacent said second end of said field means with said field means being movable in said housing in response to the force exhibited on said first end of said field means by said expandable means so as to move said first abutment means into engagement with said second abutment means so as to locate said field properly in said housing.

15. A hair clipper as set forth in claim 14 wherein a pair of runners are provided on opposite sides of said housing so that said field means is slideable back and forth on said runners and a pair of resilient pads are positioned intermediate said field means and said runners.

16. A hair clipper as set forth in claim 15 wherein said resilient pads extend over a portion of said first end of said field means and said housing has third abutment means located such that said resilient pads are positioned intermediate said third abutment means and said first end of said field means.

17. A hand-held hair clipper comprising a thin, elongated two-piece housing with a rear end and a front end and having a first housing member and a second housing member, an electric motor in said housing having a stationary field means having a rear end and a front end and a vibratory armature positioned adjacent said front end of said field means, said first housing having a first boss near said rear end, said second housing member having a second boss near said rear end, a compressible expandable means positioned intermediate said first and second bosses, means to secure said first and second housing members together and to compress said expandable means between said first and second bosses thereby expanding the dimensions of said expandable means in at least one direction, said field means having a first surface at the rear end thereof which is in contact with an outer second surface of said expandable means when said expandable means is expanded by compression, first abutment means located adjacent the front end of said field means, second abutment means on said housing located adjacent said front end of said field means with said field means being movable toward the front end of said housing in response to the force exhibited on said first surface at said rear end of said field means via said second surface of said expandable means so as to move said first abutment means into engagement within said second abutment means thereby locating said field properly in said housing, a bearing pin around which said armature oscillates, a pair of torsion springs located on opposite sides of said armature for returning said armature to a central position, said bearing pin being secured to said housing and projecting along the thin dimension of said housing, said torsion springs being coiled around the axis of said bearing pin, one end of each of said torsion springs being secured to said armature and the other end of each of said torsion springs being in engagement with said housing, a blade set comprising a first blade member and a second blade member, said armature being located in said housing intermediate said field means and said blade set, means to secure said second blade member to said front end of said housing, a drive pin secured to said armature and projecting along the elongated dimension of said housing toward said blade set, a drive bearing having a hollow bearing section which is positioned over said drive pin and a spherical end section on the outer end of said drive bearing, resilient, compressible spring means surrounding said bearing section and biasing said spherical end section toward said blade set, blade drive and biasing comprising a spherical recess for recieving said spherical end section, said blade drive and biasing means being in engagement with said first blade member so as to bias said first and second members together and so as to drive said first blade member in vibratory motion relative to said second blade member.

18. A hair clipper as set forth in claim 17 wherein said blade drive and biasing means comprises a drive socket having said recess the rein and a separate drive shoe which is secured to said first member, said drive socket having one or more first surfaces, and said drive shoe having one or more second surfaces which are in engagement with respective ones of said first surfaces so as to transmit the forces applied to said recess by said spherical end section from said drive socket to said first member of said blade set via said drive shoe.

19. A hair clipper as set forth in claim 18 wherein said drive shoe is removably secured to said first blade member.

20. A hair clipper as set forth in claim 19 wherein said drive shoe has a first guide surface formed thereon, said housing has a second guide surface formed thereon and said first and second guide surfaces are in engagement during operation of said device.

21. A hair clipper as set forth in claim 20 wherein said spherical recess has a hole therein to prevent air compression in said recess.