Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Axially fixed to tool
Reexamination Certificate
2001-03-05
2002-09-10
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Axially fixed to tool
C408S24100G, C409S206000
Reexamination Certificate
active
06447221
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to the structure of a drilling machine convenient for changing its drill bit, and for fast adjustment of the desired depth of drilling, and especially to the structure suiting a drilling machine or the like.
Conventional drilling machines generally are provided with clamping portions for changing drill bits, and the desired depths of drilling are all decided following the feeling of operators, if the holes drilled are too shallow, many times of repeated drilling are required; and either case that the holes drilled are too deep or the workpieces are pierced is not desired.
In order to get rid of the defects in drilling, another structure of drilling machine has been disclosed, such as the “REMOVABLE DEPTH GUIDE FOR ROTARY CUTTING TOOL” of the U.S. Pat. No. 5,829,931 (as shown in FIG.
7
); the drilling machine
10
of such structure has a clamping portion
18
for the bit with an axle collar
22
over it. The axle collar
22
has an extended arm
22
a
extending outwardly therefrom and provided with a screw hole. An abutment seat
24
with a similar shape as that of the axle collar
22
is stacked with an extended arm
24
a
thereof on the extended arm
22
a
of the axle collar
22
. The extended arm
24
a
is provided thereon with an elongate slot, a screw
28
is extended through the elongate slot and the screw hole respectively of the extended arm
24
a
and the extended arm
22
a
; by screwing off or on of the screw
28
, the height of the abutment seat
24
can be adjusted to get the object of having a suitable drilling depth. However, in practice, the drilling machine has the following defects:
1. The axle collar is fixedly provided on the clamping portion of the drilling machine, it is inconvenient in changing the bit.
2. The axle collar is fixed to the abutment seat by means of a screw, screwing off or on of the screw is easy, however, it can not get the object of fast adjustment, and thereby is not desired.
SUMMARY OF THE INVENTION
In view of the defects of the conventional drilling machines, the inventor of the present invention studied and developed the present invention based on his professional knowledge and practical experience of years in designing and marketing of the related products, in order to provide convenience in use for the consumers, and this is the motive of the present invention.
The primary object of the present invention is to provide a structure of drilling machine, by providing a control rod on an adjusting and fixing seat, a desired height of the adjusting and fixing seat can be fast acquired.
The secondary object of the present invention is to provide a structure of drilling machine having an adjusting and fixing seat which can be fast assembled and detached.
To get the stated objects, the present invention is provided with a main machine of the drilling machine, the main machine is provided on one end thereof with a control switch. By pressing the control switch to position the clamping portion for a bit, the bit can be changed conveniently, and the adjusting and fixing seat can be fast connected to the periphery of the clamping portion. The adjusting and fixing seat includes a fixing seat and an adjusting rack to be stacked with each other by means of the vertical walls respectively provided on the peripheries of the two, and a latching bolt and a control piece are pivotally connected to the vertical walls. By pressing the control piece, the adjusting rack can be fast adjusted for its desired height, so that the bit can be used to drill a hole of a desired depth.
The present invention will be apparent in its particular structure and characteristics after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings.
REFERENCES:
patent: 2382639 (1945-08-01), Kennard
patent: 4674927 (1987-06-01), Khurana
patent: 5829931 (1998-11-01), Doumani
patent: 566231 (1944-12-01), None
Dennison, Schultz & Dougherty
Howell Daniel W.
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