Impact screwdriver having a shaft locking device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Jun 5, 2012
Grant Date -
May 27, 2010
app pub date -
Nov 24, 2009
filing date -
Nov 25, 2008
priority date (Note) -
Expired
status (Latency Note)
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Importance

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Abstract
The present invention provides both an impact switching function and a shaft locking function for use in an impact screwdriver. The impact screwdriver includes a housing, a motor located in the housing, a motor drive shaft driven by the motor, a hammer which can move axially and rotate around the motor drive shaft, a hammer anvil, an impact switching device and a shaft locking apparatus. The shaft locking apparatus has a mating member coupled with the hammer anvil, an engagement ring fixed to the housing and a middle member located between the mating member and the engagement ring. The shaft locking apparatus has a locked position, where the mating member is secured to the hammer anvil and also secured to the engagement ring and the housing.
First Claim
all claims..Other Claims data not available
Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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CHERVON LIMITED | FLAT C 21/F STAGE 1 TUNG CHUN INDUSTRIAL BUILDING 9-11 CHEUNG WING RD KWAI CHUNG NT |
International Classification(s)

- 2009 Application Filing Year
- B25B Class
- 548 Applications Filed
- 363 Patents Issued To-Date
- 66.25 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Zhu, Yongbing | Nanjing, CN | 7 | 20 |
# of filed Patents : 7 Total Citations : 20 |
Cited Art Landscape
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Patent Citation Ranking
- 6 Citation Count
- B25B Class
- 5.98 % this patent is cited more than
- 13 Age
Forward Cite Landscape
- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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