Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Reexamination Certificate
2001-04-02
2001-11-20
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With means to move or guide member into driving position
Including supply magazine for constantly urged members
C227S127000
Reexamination Certificate
active
06318618
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a pneumatic nail driving device, more particularly to a barrel unit with a removable cover plate for a pneumatic nail driving device.
2. Description of the Related Art
In a known pneumatic nail driving device, a nail feeding unit aligns a nail from a nail cartridge with a nail impelling unit so as to discharge the nail via a barrel unit. Jamming of the pneumatic nail driving device usually occurs, thereby preventing the discharge of the nail through the barrel unit. In order to resume proper operation of the pneumatic nail driving device, a cover plate of the barrel unit is removed to remedy the cause of jamming. Thus, it is important for the barrel unit to have a structure which facilitates installation and removal of the cover plate.
Referring to
FIGS. 1 and 2
, a conventional barrel unit is shown to be installed on a front end of a pneumatic nail driving device
1
and includes an elongated base plate
2
which extends forwardly from the housing of the pneumatic nail driving device
1
. The base plate
2
has a top face formed with a longitudinal discharge groove and a pair of upwardly extending hooking lugs
201
which are disposed respectively on opposite sides of the discharge groove and which are located at a front portion of the base plate
2
, and a pair of upwardly extending first pivot ears
202
which are disposed respectively on opposite sides of the discharge groove and which are located at a rear portion of the base plate
2
. An elongated cover plate
3
is superimposed on the base plate
2
, and has a pivot end
300
pivoted to the first pivot ears
202
of the baseplate
2
, and a pair of upwardly extending second pivot ears
301
between the pivot end
300
and the hooking lugs
201
. A latch includes an operating lever
311
formed with a pair of third pivot ears
311
″ mounted pivotally on the second pivot ears
301
of the cover plate
30
, and a U-shaped clasper
312
secured to the operating lever
311
.
After the clasper
312
has been disposed around the hooking lugs
201
, the operating lever
311
is turned rearwardly so as to pull the clasper
312
to engage tightly the hooking lugs
201
and so as to press the cover plate
3
against the base plate
2
. When it is desired to remove the cover plate
3
, the operating lever
311
is turned forwardly to permit removal of the clasper
312
from the hooking lugs
201
and to permit lifting of the cover plate
3
from the base plate
2
.
If the pneumatic nail driving device
1
is used to drive several nails in rapid succession, the shock experienced by the cover plate
3
during the nail driving operation may loosen the operating lever
311
in the arrow directions (X,Y), as best shown in
FIG. 2
, thereby resulting in untimely removal of the cover plate
3
from the base plate
2
.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a barrel unit for a pneumatic nail driving device which can overcome the aforementioned drawback that is generally associated with the conventional pneumatic nail driving device.
Accordingly, a barrel unit of the present invention is adapted to be installed on a front end of a pneumatic nail driving device, and includes an elongated base plate, an elongated cover plate, and a latch unit. The base plate has a top face formed with a longitudinal nail discharge groove, a pair of upwardly extending hooking lugs which are disposed respectively on the opposite sides of the discharge groove and which are located at a front portion of the base plate, and a pair of upwardly extending first pivot ears which are disposed respectively on opposite sides of the discharge groove and which are located at a rear portion of the base plate. The cover plate is superimposed on the top face of the base plate to cover the discharge groove, and has a pivot end pivoted to the first pivot ears of the base plate, a pair of upwardly extending second pivot ears between the pivot end and the hooking lugs, a pair of abutment tabs which project sidewise and respectively from the second pivot ears, and a pair of shoulders which are disposed behind the hooking lugs. The latch unit includes an operating lever formed with a pair of third pivot ears mounted pivotally on the second pivot ears of the cover plate in such a manner that the third pivot ears of the operating lever slidably and respectively contact the abutment tabs, and a U-shaped clasper connected pivotally to the operating lever, and detachably engaging the hooking lugs.
After the clasper has been disposed the clasper around the hooking lugs, the operating lever is turned rearwardly about the second pivot ears so as to result in tight engagement between the clasper and the hooking lugs and subsequently causes tight engagement between the third pivot ears of the operating lever and the abutment tabs, and tight engagement between the shoulders and the hooking lugs, thereby tightening the cover plate on the base plate. Under such a condition, the cover plate is prevented from loosening from the base plate even under the presence of vibrating shocks experienced by the cover plate during the nail driving operation.
REFERENCES:
patent: 4436236 (1984-03-01), Jobe
patent: 4467952 (1984-08-01), Morrell, Jr.
patent: 4549681 (1985-10-01), Yamamoto et al.
patent: 4641772 (1987-02-01), Skuthan
patent: 4688710 (1987-08-01), Massari, Jr. et al.
patent: 5642849 (1997-07-01), Chen
patent: 6056182 (2000-05-01), Chen
patent: 6076722 (2000-06-01), Huang
Apach Industrial Co., Ltd.
Brinks Hofer Gilson & Lione
Smith Scott A.
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