Electricity: circuit makers and breakers – Switch activation inhibitor – Combined with connector coupling
Reexamination Certificate
2004-04-28
2004-12-28
Lee, Kyung S. (Department: 2832)
Electricity: circuit makers and breakers
Switch activation inhibitor
Combined with connector coupling
C200S293000, C439S131000
Reexamination Certificate
active
06835903
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a design of an automatic locking and releasing structure for a push-pull plug, particularly relates to a structural design for one where the conductive blades of the plug may be automatically locked in place and released to recover while adjusting the conductive blades to retract or extend.
BACKGROUND OF THE INVENTION
It is found that the structural assembly of the conventional universal adaptor is provided with a plurality of sets of conductive blades of different configurations on the plug body, such that each set of conductive blades are embedded in the plug in a retracting or wrenching manner. Accordingly, the user may select one set of conductive blades in accordance with the power outlet specification at a desired country in using plug, while the remaining sets of conductive blades are concealed in the plug body. As such, the plug may be adapted to various power outlet specifications by adjusting the position of each set of the conductive blades.
The retracting structure of the conductive blades for the aforementioned universal adaptor (as shown in
FIGS. 1 and 2
) includes: conductive blades
10
provided on a slider
20
; urging tabs
201
affixed to two sidewalls of the slider
20
, such that the urging tabs
201
are able to act on push-buttons
30
provided on the outside of the slider
20
(as shown in FIG.
3
), the push-buttons
30
being releasably engaged in slots
40
formed on the plug and restrained in place by a stop pieces
401
formed at the inside of the slots
40
. When a user intends to adjust the state of the conductive blades
10
, he needs to press the push-buttons
30
to disengage the push-buttons
30
from a state that is stopped and retrained by the stop pieces
401
, to consequently cause displacement of the slider
20
driven by the push-buttons
30
, such that when the conductive blades
10
are adjusted to the desired position, the user would release the force applying against the push-buttons
30
such that the push-buttons
30
are able to assume a state that urges against the stop pieces
401
under the influence of the urging tabs
201
(as shown in FIG.
4
).
However, when the user does not understand the proper procedure for adjusting the conductive blades
10
, he would intuitively and directly push and slide the push-buttons
30
to perform the adjusting operation. The intuitive operation would damage the stopping structure between each of the push-buttons
30
and stop pieces
401
as time passes to a least extent that would result in poor positioning of the conductive blades
10
, or a severe extent that would result in complete malfunctions of the conductive blades
10
.
In view of the shortcomings of the prior art, the inventor of this invention made improvements and invented an automatic locking and releasing structure for push-pull plug that is designed in consideration of the human factors and operational habits of the ordinary users, where the locking or releasing operations may be accomplished automatically while performing the adjusting operation by retracting/extending the conductive blades without damaging the structure.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide an automatic locking and releasing structure for a push-pull plug, where the conductive blades of the plug may be automatically locked in place and released to recover upon retracting or extending push-buttons.
To achieve this objective, this invention includes an upper case, a bottom case, a slider and push-buttons. The bottom case is suspended therein with two symmetrically arranged slide tracks that are each provided at the inside thereof with a wedge piece. The opposing sides of the slider are each formed with a resilient retaining arm, and the slider is movably provided between the two slide tracks. The free ends of the resilient retaining arms are movably attached to the push-buttons provided at the outside of the slide tracks. As such, when one manipulates the push-buttons to move along slide slots formed in the upper case and bottom case, the slider may be retracted or extended at the same time thereby subjecting the resilient retaining arms to assume a locking or releasing state with respect to the wedge pieces.
It is a further objective of this invention to provide an automatic locking and releasing structure for a push-pull plug, wherein the wedge pieces are each formed of an inclined configuration along the inside of the respective slide tracks such that when the slide tracks are driven by the slider to move upwards, the resilient retaining arms provided on opposing sides thereof are able to enter stopping faces formed on tops of the wedges piece along the inclined faces of the wedge pieces, subjecting the slider to be locked in place.
It is another objective of this invention to provide an automatic locking and releasing structure for push-pull plug, where the push-buttons are each formed on opposing sides of an urging plate thereof with inclined guide slots of an inclined configuration in such a manner that the inclined guide slots are correspondingly attached to opposing sides of the free ends of the resilient retaining arms, and capable of pushing the slider to move upwards. However, when the push-buttons slide downwards, the inclined guide slots are able to push the resilient retaining arms inwards to disengage from the stopping faces of the wedge pieces thereby releasing the slider.
REFERENCES:
patent: 5220152 (1993-06-01), Doran
patent: 5507162 (1996-04-01), Chhatwal
patent: 5516305 (1996-05-01), Haluska
patent: 5847540 (1998-12-01), Burns et al.
patent: 6042400 (2000-03-01), Queffelec et al.
patent: 6062880 (2000-05-01), Skuza
Liang Cho-Liang
Liu Ke-Chih
Pan Jeng-Je
Ahoku Electronic Company
Lee Kyung S.
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