Magnetic impact device and method for magnetically...

Details Magnetic impact device and method for magnetically... Magnetic impact device and method for magnetically...

2002-08-05

2004-02-24

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Processes

C173S114000, C173S117000

Reexamination Certificate

active

06695070

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic impact device, a power tool having the magnetic impact device and a magnetic impact generator. The present invention further relates to a method for magnetically generating impact motion.
2. Discussion of the Background
Portable power tools used for drilling, fastening and the like are expected to be relatively small and light, yet provide high power to perform the functions. Referring to
FIG. 1
, the tool is typically driven by an electric motor
110
. The rotational motion of the motor
110
is transmitted to a chuck
160
which holds a tool bit
115
by means of an intermediate mechanism
120
. The motor
110
is generally small due to restrictions imposed on overall size and weight of the portable power tools. Limited power of the small motor might not be enough to drive the intended load. A hammer type of mechanism
120
is introduced to respond to the need to generate high output torque from a small drive.
Referring to
FIG. 2
, the hammer type of mechanism
120
is rotated by the motor
110
. The hammer type of mechanism
120
includes hammers (
120
a
and
120
b
). The hammer type of mechanism
120
stores the rotational energy of the motor
110
over a large angle of rotation, for example, half turn (180°). Then the hammers (
120
a
and
120
b
) hit the chuck
160
to create an impact torque over a small angle (for example 10°) of rotation of the chuck
160
. In this portable power tool, noise is made when the hammers (
120
a
and
120
b
) hit the chucks
160
.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, a magnetic impact device includes at least one chuck, at least one hammer and a driving unit. The at least one hammer is relatively movable with respect to the at least one chuck. One of the at least one hammer and the at least one chuck has at least one magnet. Another of the at least one hammer and the at least one chuck has at least one magnet or magnetic material. The driving unit is configured to move the at least one hammer relatively to the at least one chuck to magnetically generate impact motion of the at least one chuck.
According to another aspect of the present invention, a power tool includes a magnetic impact device. The magnetic impact device includes at least one chuck, at least one hammer and a driving unit. The at least one hammer is relatively movable with respect to the at least one chuck. One of the at least one hammer and the at least one chuck has at least one magnet. Another of the at least one hammer and the at least one chuck has at least one magnet or magnetic material. The driving unit is configured to move the at least one hammer relatively to the at least one chuck to magnetically generate impact motion of the at least one chuck.
According to further aspect of the present invention, a power tool magnetic impact generator includes at least one chuck and at least one hammer. One of the at least one hammer and the at least one chuck has at least one magnet. Another of the at least one hammer and the at least one chuck has at least one magnet or magnetic material. The at least one hammer is configured to be moved relatively to the at least one chuck to magnetically generate impact motion of the at least one chuck.
According to further aspect of the present invention, a method for magnetically generating impact motion includes providing at least one chuck and providing at least one hammer. One of the at least one hammer and the at least one chuck is provided with at least one magnet. Another of the at least one hammer and at least one chuck is provided with at least one magnet or magnetic material. The at least one hammer is moved relatively to the at least one chuck to magnetically generate impact motion of the at least one chuck.


REFERENCES:
patent: 519662 (1894-05-01), Carpenter
patent: 2635854 (1953-04-01), Richards et al.
patent: 2861778 (1958-11-01), Spurlin
patent: 2949909 (1960-08-01), Macchioni et al.
patent: 3811313 (1974-05-01), Schut
patent: 4468594 (1984-08-01), Jacquemet
patent: 5497555 (1996-03-01), Averbukh

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