Chucking device for dental handpiece

Assignee: Nakanishi Inc

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Filing: 1987-01-22

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Granted: —

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Expires: 2007-01-22

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Abstract

Abstract A chucking device for a dental handpiece (10) is provided for chucking a dental treatment chip (11) such as a dental bur. The chucking device includes a sleeve (14) for receiving the dental bur (11), a push-button (21) for acting on the dental bur (11) and a locking element (19) adapted to lock the dental bur (11) within the sleeve (14). The locking element (19) is formed as a spring plate received within a longitudinal slot (14b) in the sleeve (14) and has a projecting part (19a) adapted to be engaged with a mating recessed part (11 b) in the dental bur (11) for securing the dental bur (11) in the sleeve (14) to perform dental treatment operation. For exchanging the dental bur (11), the push-button (21) is simply pressed so that an abutment portion (21 a) of the push-button (21) acts on the projecting part (19a) of the spring plate (19) to disengage the projecting part (19a) from the recessed part (11b) of the dental bur (11) to disconnect the bur (11) from the sleeve (14).

Inventors

👤 Takasuke Nakanishi

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-10-30 07:39

CPC Classifications

A; A61; A61C; A61C1/00; A61C1/08; A61C1/14; A61C1/141

Claims Analysis

Total Claims: 7

Claim 1

Independent Claim 189 words

A chucking device for a dental handpiece (10) comprising: a detal treatment chip (11) for performing dental treatment operation; a sleeve (14) for receiving therein said dental treatment chip (11); a push-button (21) operable for disconnecting said dental treatment chip (11); and locking means (19) having a locking part (19a) for locking said dental treatment chip (11) within said sleeve (14) so as not to be detached from the sleeve (14), said locking means (19) being adapted to disconnect the chip (11) when the chip (11) is exchanged; said locking part (19a) engaging with an engaging part (llb) formed with said dental treatment chip (11) to lock and secure the dental treatment chip (11) within said sleeve (14) when the dental handpiece (10) is used, said push-button (21) being pressed upon exchanging the chip (11) to bring an abutment portion (21a) of the push-button (21) into abutment with said locking means (19) to thereby disengage the engaging part (llb) of the dental treatment chip (11) and the locking part (19a) of the locking means (19) from each other to disconnect said dental treatment chip (11) from said sleeve (14).

Claim 2

Dependent Claim 72 words

A chucking device for a dental handpiece (10) as claimed in claim 1, wherein said locking means (19) has a first cam surface (19e), said abutment portion (21a) of said push-button (21) abutting on said first cam surface (19e) to shift said locking means (19) so as to disengage said engaging part (llb) of said dental treatment chip (11) and the locking part (19a) of said locking means (19) from each other.

Claim 3

Dependent Claim 106 words

A chucking device for a dental handpiece (10) as claimed in claim 1, wherein said locking means (19) has a second cam surface (19c), a leading end part (llc) of the dental treatment chip (11) abutting on said second cam surface (19c) to shift said locking means (19) when the chip (11) is pushed and fitted into said sleeve (14), said locking part (19a) snapping into the engaging part (llb) of the dental treatment chip (11) to lock and secure said chip (11) within said sleeve (14) when said leading end part (llc) is introduced further beyond the locking part (19a) of said locking means (19).

Claim 4

Dependent Claim 29 words

A chucking device for a dental handpiece (10) as claimed in claim 1, wherein said locking means (19) is engaged in a slot (14b) formed in said sleeve (14).

Claim 5

Dependent Claim 53 words

A chucking device for a dental handpiece (10) as claimed in claim 1, wherein said locking means (19) comprises a spring plate, an end part (19b) of which is secured to said sleeve (14), said spring plate being pivoted about said end part (19b) when mounting or dismounting said dental treatment chip (11).

Claim 6

Dependent Claim 67 words

A chucking device for a dental handpiece (10) as claimed in claim 1, wherein said dental treatment chip (11) has a recessed abutment section (lla) adapted to be brought into abutment with a projecting abutment section (14a) formed with said sleeve (14) for securing said dental treatment chip (11) against rotation within said sleeve (14) and for sustaining a force acting on the dental treatment chip (11).

Claim 7

Dependent Claim 71 words

A chucking device for a dental handpiece (10) as claimed in claim 6, wherein said locking part (19a) of said locking means (19) and said engaging part (llb) of said dental treatment chip (11) are formed at a relative position in which the locking part (19a) and said engaging part (llb) are engageable with each other when said recessed abutment section (lla) abuts on said projecting abutment section ( 14 a).

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