Tool driving or impacting – Impacting devices – With means for rotating tool
Reexamination Certificate
2003-06-19
2004-01-13
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
With means for rotating tool
C173S132000, C173S164000, C173S217000, C279S019400
Reexamination Certificate
active
06675910
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to an improved structure of hand tool, and especially to a hand tool suitable for fast changing a grinding member during operation.
2. Description of the Prior Art
The inventor of the present invention had provided an “Improved Structure of Multi-functional Hand Tool” which was granted with a patent of utility model in Taiwan with a patent publish number of 447,362 and granted with a patent of invention in U.S.A. with a patent number of U.S. Pat. No. 6,202,760B1; the main structure of the hand tool, as shown in
FIGS. 1 and 2
, comprises a chuck
60
, a positioning sleeve
14
, a pushing axle-rod
50
, a pushing member
40
, a pipe
70
and an outer sleeve
80
.
With the above members, the chuck
60
and the pushing axle-rod
50
are extended into the positioning sleeve
14
respectively from two ends of a central axle hole of the latter, a bolt on the front end of the pushing axle-rod
50
is screw connected with an inner thread of the chuck
60
, a spring slipping over the pushing axle-rod
50
is exactly pressed against between an annular protrusion and a stop ring of the positioning sleeve
14
; a rear bolt on the rear end of the pushing axle-rod
50
is screw connected with a driving rod, and an outer annular member for the positioning sleeve
14
is slipped in two sliding bearings
142
, then the positioning sleeve
14
is placed together with pushing axle-rod
50
and the chuck
60
into the pipe
70
to render the positioning sleeve
14
able to rotate on the sliding bearings
142
, a front inner thread of the pipe
70
is connected with an outer thread of a front collar, so that the chuck
60
is extended out of the front end of the front collar.
The pipe
70
has a rear inner thread on the rear end thereof locked into the pushing member
40
, so that a cylindrical rod on the front end of the pushing member
40
abuts against the rear area of the annular protrusion of the pushing axle-rod
50
; while a hole on a thread portion of the outer annular member of the pushing member
40
is exactly located at the position where a position-limiting annular groove of the pipe
70
is. The rear end of the pipe
70
is slipped in the outer sleeve
80
, and an inner screw hole of the outer sleeve
80
is aligned with the position-limiting annular groove of the pipe
70
, then a positioning bolt is locked into the inner screw hole to extend through the position-limiting annular groove and the hole on the pushing member
40
to complete the hand tool.
From the above disclosed structure of the “Improved Structure of Multi-functional Hand Tool”, it has the pushing member
40
moved mainly by rotating of the outer sleeve
80
, so that the pushing member
40
and the outer sleeve
80
are moved synchronically; and by using the pushing member
40
to push the pushing axle-rod
50
, while the pushing axle-rod
50
is connected by locking with the chuck
60
, when the pushing axle-rod
50
is pushed by the pushing member
40
, it moves the chuck
60
and pushes the chuck
60
toward the outside of the pipe
70
to make the chuck
60
become a loosened state, and now a grinding member
90
can be changed.
However, such a structure must have the grinding member
90
changed under the state that the hand tool is stopped. By virtue that the pushing axle-rod
50
is linked up with the driving rod, when the pushing axle-rod
50
is pushed by the pushing member
40
, the pushing axle-rod
50
will generate an axial pulling force against the driving rod, this tends to damage the axle.
SUMMARY OF THE INVENTION
Therefore, the inventor of the present invention provides the improved structure of hand tool based on his professional experience of years in studying, designing and manufacturing same kind of products and after hard study, developing, as well as repeated experiments and tests, in order to make the hand tool get the object of changing a grinding member fast, and to avoid the axle from damage, the structure for changing of it is perfect.
The present invention mainly comprises a first pipe, a second pipe, a rotating sleeve, a pushing member, a pushing axle-rod and a chuck, it is characterized in that: the first pipe is provided thereon with a position-limiting slot and a plurality of positioning holes, the positioning holes are provided for extending therethrough of two position-limiting elements; the first pipe is provided thereon with an elastic piece for abutting against the position-limiting elements; the rotating sleeve is slipped over the first pipe, and is provided thereon in opposition to the position-limiting slot with a hole for extending of a pivotally-connecting element therein to connect and lock the pushing member, the hole has on the inner wall thereof a positioning groove to engage the position-limiting elements and to make an effect of positioning with the elastic piece; the pushing member is slipped over the pushing axle-rod, the pushing axle-rod has a bearing slipping thereover; and one end of the pushing axle-rod is brought to rotate by a driving element, the other end is pivotally connected with the chuck, and assembling of the hand tool thus is completed.
The object of the present invention is to have the pushing member moved mainly by rotating of the rotating sleeve, so that the pushing axle-rod is endued with an axial pushing force to make the chuck to push toward the outside of the first pipe to make the chuck become a loosened state; by virtue that the pushing axle-rod has a bearing thereon, when the pushing axle-rod is driven by the driving element, the pushing axle-rod can keep on operating to avoid being blocked, thereby the hand tool able to fast change the grinding member during operation can be provided.
Another object of the present invention is resided in that: the driving element is provided in the second pipe, and the driving element is connected with an electric power-line by insertion connecting through a connecting device to allow a user to change the driving element by himself.
REFERENCES:
patent: 3802518 (1974-04-01), Albert
patent: 4091880 (1978-05-01), Troutner et al.
patent: 4400995 (1983-08-01), Palm
patent: 5360073 (1994-11-01), Akazawa
patent: 5765652 (1998-06-01), Mathis et al.
patent: 6202760 (2001-03-01), Lin
patent: 6273200 (2001-08-01), Smith et al.
patent: 6311787 (2001-11-01), Berry et al.
Bacon & Thomas PLLC
Smith Scott A.
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