Coating implements with material supply – Projectable and retractable tool – Including retraction spring and projected-position retainer
Reexamination Certificate
2000-05-31
2001-09-18
Eloshway, Charles R. (Department: 3751)
Coating implements with material supply
Projectable and retractable tool
Including retraction spring and projected-position retainer
C401S112000, C015S436000
Reexamination Certificate
active
06290415
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic device, more particularly, to a telescopic device with a firm positioning effect which can be applied a scratch awl, a drilling bar, a screw, a ball-pen and the like for achieving a better positioning effect as well as ease of retraction.
FIG. 20
shows the structure of a conventional drill bar and
FIG. 21
shows a conventional scratch awl. Neither the drill bar nor the scratch awl is equipped with a telescopic design so that the pointed end thereof could easily injure the skin of the user when they are carried on the pocket of their clothes of the user.
FIG. 22
shows the cross-sectional view of a conventional ball-pen. By pressing a button rod (d), a sliding pin (d
1
) moves along a channel (b) and is positioned at a positioning slot (c) so that the pen point (f) extends from the pen tube (a), and the ball-pen is ready for use (see FIG.
23
).
FIG. 24
shows the cross-sectional view of another conventional ball-pen. When a button rod (d) is pressed, the position point (c
1
) of a pin (c
2
) moves to a position slot (a
1
) and the pen point (f) of the ball-pen is exposed for use (see FIG.
25
). These two types of conventional ball-pens have a common disadvantage that a firm positioning might not be achieved so that the pen point (f) could easily retract back to the inside of ball-pen during use. The structure of a third conventional ball-pen is shown in
FIGS. 26 and 27
and is equipped with the design of a ratchet device. During use of the ball-pen, however, a cam body (d
1
) which abuts against the positioning portion (b
2
) might move from it so that the pen point (f) draws back inside the pen tube (a).
FIGS. 28 and 29
show the cross-sectional view of a fourth conventional ball-pen. By pressing the rod (d), a pin (k) is urged to slidably move into a positioning slot (b
3
) disposed at the pen tube (a) of the ball-pen while the push rod (k
1
) pushes the pen point (f) so as to be exposed outside the body of the ball-pen for use. Such a design has the disadvantage that the pin (k) easily deforms and moves away from the positioning slot (b
3
) so that the pen point (f) retracts into the pen tube (a).
SUMMARY OF THE INVENTION
To overcome the drawbacks of the conventional ball-pens, an object of the present invention is to provide a telescopic device having a firm positioning effect which can achieve better positioning and ease of retraction.
To achieve the object mentioned above, the present invention provides a telescopic device with a firm positioning effect which comprise a hollow upper sleeve having at least one arcuate recess at the inner wall thereof, and having a through hole at the top portion thereof and internal threads at the lower end thereof, a hollow lower sleeve having external threads disposed at the upper end thereof to be threadedly connected to the internal threads of the hollow upper sleeve, and a hole formed on the lower end thereof, a guide mechanism disposed at the internal portion of the hollow upper sleeve and hollow lower sleeve, and including an intermediate body having a ring portion at top end thereof, a thin rod disposed on the ring portion and a thick rod disposed at the lower end of the intermediate body wherein the thin rod extends to protrude the outside of the top portion of the hollow upper sleeve while the lower end of the thick rod may protrude from the hole of the hollow lower sleeve; a spring positioned at the internal portion of the hollow lower sleeve and through which the thick rod is passed; a hollow cylinder providing for the passage of the thin rod; and a push rod disposed at the top portion of the hollow cylinder and having an elongated channel extending from the bottom thereof and through which the thin rod is inserted, whereby the hollow cylinder downwardly moves and slides into the recess portion by when the push rod is pressed so that the thick rod extends out of the hollow lower sleeve.
REFERENCES:
patent: 2865331 (1958-12-01), Marcotte
patent: 2930355 (1960-03-01), Bollerup
patent: 3458264 (1969-07-01), Ritter
patent: 1075981 (1960-02-01), None
Eloshway Charles R.
Pro-Techtor Inter-national Services
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