Geometrical instruments – Scriber
Reexamination Certificate
2003-09-04
2004-10-12
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Scriber
C409S130000, CD18S057000
Reexamination Certificate
active
06802128
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an engraving dial formed of an upper dial plate and a lower dial plate for use in an inside ring engraving machine and, more particularly to such an engraving dial, which has the top and bottom sides of each dial plate respectively engraved with a respective set of signs for engraving selection.
2. Description of the Related Art
A ring is a circular band of precious metal, worn as an ornament. For memorial purpose, people may have the inside ring engraved with letters, numbers, symbols, etc., (hereinafter called signs).
A machine for engraving signs on the inside ring of a ring is called “inside ring engraving machine”. An inside ring engraving machine is used with an engraving dial to achieve the engraving. The invention pertains to an engraving dial for inside ring engraving machine.
FIGS. 1 and 2
show an engraving dial constructed according to the prior art. According to this design, the engraving dial, referenced by
70
, comprises a lower dial plate
71
, a hub
72
locked to the lower dial plate
71
at the top, and an upper dial plate
73
rotatably mounted on the hub
72
and supported on the top side of the lower dial plate
71
. The dial plates
71
and
73
have engraved signs
74
or
75
at the top. The lower dial plate
71
has V-notches
76
equiangularly spaced around the periphery.
When engraving words, for example, “My” on the inside ring and assuming that the initial “M” is at the lower dial plate
71
and the last letter “y” is at the upper dial plate
73
, thus the engraving operation is as follows:
At first, as shown in
FIG. 3
, the engraving dial
70
is installed in the base
61
of the inside ring engraving machine
6
, and then the engraving dial
70
is rotated to let the stopper
62
engage the V-notch
76
corresponding to the sign “M”, holding the lower dial plate
73
in the engraving position. Thereafter, fasten up the tightening knob
63
to lock the engraving dial
70
to the base
61
of the inside ring engraving machine
6
. Thus the user can operate the inside ring engraving machine to move the tracing stylus shaft
64
on the letter “M”, causing the diamond engraving cutter (not shown) to engrave the inside ring of the loaded ring.
When engraving the letter “y”, as shown in
FIG. 4
, rotate the upper dial plate
73
, for enabling the steel balls
79
of the locators
78
to be respectively forced by the respective compression springs
80
into the recessed round holes
81
at the lower dial plate
71
(See FIG.
2
). Upon engagement of the steel balls
79
into the recessed round holes
81
of the lower dial plate
71
, a positioning click sound is produced, and the upper dial plate
73
is locked to the lower dial plate
71
. At this time, the signs
75
at the upper dial plate
71
and the signs
74
at the lower dial plate
71
are respectively aligned. Thereafter, fasten up the hold down bolt
82
to lock the upper dial plate
73
to the lower dial plate
71
, and then rotate the engraving dial
70
to let the stopper
62
engage the V-notch corresponding to the sign “y” at the upper dial plate
73
, and then fasten up the tightening knob
63
to lock the engraving dial
70
to the base
61
of the inside ring engraving machine
6
. Thus, the user can then engrave the sign “y” on the inside ring of the loaded ring.
This design of engraving dial provides only one combination of signs, for example, the combination of full cap signs at the lower dial plate and minuscule signs at the upper dial plate. Further, because one dial plate provides only one form of signs, the user may have to prepare additional dial plates of different forms of signs for selection.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view.
It is the main object of the present invention to provide an engraving dial, which has the top and bottom sides of each dial plate respectively engraved with a respective set of signs, providing four combinations for engraving selection.
To achieve this and other objects of the present invention, the engraving dial comprises a bottom holder plate, the bottom holder plate comprising an upper part, a lower part, the lower part of the bottom holder plate having an outer greater than the upper part of the bottom holder plate, a center through hole through the lower part and upper part of the bottom holder plate, and a plurality of screw holes extended through the lower part of the bottom holder plate and equiangularly spaced around the center through hole of the bottom holder plate; a lower dial plate, the lower dial plate comprising a center through hole adapted to accommodate the lower part of the bottom holder plate, a plurality of peripheral notches equiangularly spaced around the periphery thereof, two sets of signs respectively engraved on top and bottom sides thereof at imaginary radial lines between the center through hole of the lower dial plate and the peripheral notches, a plurality of recessed round holes symmetrically formed at the top and bottom sides and equiangularly spaced around the center through hole of the lower dial plate at an imaginary circle concentric to the center through hole of the lower dial plate; an upper dial plate, the upper dial plate comprising a center through hole, a peripheral opening, two sets of signs respectively engraved on top and bottom sides thereof corresponding to the signs at the lower dial plate; a top holder plate, the top holder plate comprising an upper part, a lower part fitted into the center through hole of the upper dial plate, the lower part of the top holder plate having a diameter smaller than the upper part of the top holder plate, a center through hole adapted to accommodate the upper part of the bottom holder plate, and a plurality of countersunk holes respectively fastened to the screw holes of the bottom holder plate by screws; and at least one locator, the at least one locator each comprising a retaining member respectively fastened to and vertically extended through the top holder plate, the retaining member having a bottom mounting hole, a compression spring mounted in the bottom mounting hole of the retaining member, and a steel ball supported on the compression spring at a bottom side and forced by the compression spring to selectively engage the recessed round holes of the lower dial plate.
REFERENCES:
patent: 2883918 (1959-04-01), Mosteller
patent: 3295211 (1967-01-01), Nisenson
patent: 3608429 (1971-09-01), Berlant
patent: 3736841 (1973-06-01), Usami
patent: 3755904 (1973-09-01), Kestler
Lang Bonnie Hau Yung
Yang His-Shan
Fulton Christopher W.
Pro-Techtor Inter-National Services
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