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(11) | EP 1 431 998 A2 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Safety switch device |
(57) The present invention relates to a safety switch device comprising a housing and
a handle pivotally connected to the housing via a pivot. An electric switch is accommodated
within the housing. A safety press-button is slidably provided on the housing. A pressing
member is fixedly mounted on a slideable rod in the housing. An internal portion of
the handle presses against the slidable rod. The slidable rod lies in a guiding groove
on the interior of the housing. A clearance between the slidable rod in the guiding
groove and the edge of the guiding groove is sufficient to advantageously permit the
slidable rod to swing in the guiding groove when the safety button is not depressed.
Irrespective of whether the safety press-button is depressed or not, the handle can
always be rotated about the pivot so that the risk of damage by accidental operation
of the handle or safety press button is eliminated. |
a housing;
a slidable rod slidably positioned in a guiding groove in the interior of the housing, wherein a clearance in the guiding groove is sufficient to permit the slidable rod to move non-linearly;
an externally extending handle pivotally mounted on an internal pivot in the housing, wherein an internal part of the handle presses against an end portion of the slidable rod such that rotation of the handle on the internal pivot causes the slidable rod to move;
an electric switch accommodated within the housing;
a pressing member mounted on the slidable rod for activating the electric switch; and
a safety press-button slidably provided on the housing, wherein in a first working position the safety press-button presses against a lateral edge of the slidable rod such that the slidable rod is partially constrained to move linearly and in a second working position the safety press-button is spaced apart from the lateral edge of the slidable rod such that the slidable rod is free to move non-linearly.
(1) In the first working position (non-safety), the safety press-button is depressed and engages the lateral edge of the slidable rod. The handle may be rotated to press down the slidable rod and the safety press-button partially constrains the slidable rod to move linearly and carry the pressing member down to activate the electric switch.
(2) In the second working position (safety), the safety press-button is not depressed and is spaced apart from the lateral edge of the slidable rod. The handle may be rotated to press down the slidable rod and the clearance between the slidable rod and the wall of the guiding groove is enough to permit the slidable rod to swing. In this position, the slidable rod is unable to carry the pressing member to press against and activate the electric switch.
Thus it will be apparent that irrespective of whether the safety press-button is depressed or not, the handle can always be rotated about the pivot so that the risk of damage by accidental operation of the handle or safety press button is eliminated.a guiding groove clearance enough to permit the slidable rod to swing is provided between the slidable rod in the guiding groove and the side wall of the guiding groove, the safety press-button at least has two working positions, wherein in the first working position the safety press-button presses against the lateral edge portion of the slidable rod and in the second working position the safety press-button is spaced away from the lateral edge portion of the slidable rod.
Figure 1 illustrates a preferred embodiment of the safety switch device of the present invention in a first operating position
Figure 2 illustrates a preferred embodiment of the safety switch device of the present invention in a second operating position;
Figure 3 illustrates a preferred embodiment of the safety switch device of the present invention in a third operating position; and
Figure 4 illustrates in isolation the hosuing and safety press button of the first embodiment; and
Figure 5 illustrates in isolation the safety press button of the first embodiment.
(1) In the first operating position (see Figure 1), the safety press-button 3 (in its second working position) is not depressed and is spaced apart from the lateral edge of the slideable rod 12 to leave it free to move non-linearly. The handle is lifted upwardly by the operator such that clearances I and 11 between the slideable rod 12 and the walls of the guiding groove permit the slideable rod 12 to swing freely as illustrated. In this first operating position, the pressing member 8 fails to press down and activate the electric switch 10.
(2) In the second operating position (see Figure 2), the safety press-button 3 (in its first working position) is depressed and engages the lateral edge of the slideable rod 12 to constrain it to linear movement. The handle is lifted upwardly by the operator allowing the partially constrained slidable rod 12 to move linearly and carry the pressing member 8 to press down and activate the electric switch 10.
(3) In the third operating position (see Figure 3), the safety press-button 3 (in its second working position) is not depressed and is, spaced apart from the lateral edge of the slideable rod 12. The handle 13 is unmoved. In this third operating position, the pressing member 8 is spaced apart from (and therefore is unable to activate) the electric switch 10.
a housing [9];
a slidable rod [12] slidably positioned in a guiding groove in the interior of the housing [9], wherein a clearance [1,11] in the guiding groove is sufficient to permit the slidable rod [12] to move non-linearly;
an externally extending handle [13] pivotally mounted on an internal pivot [2] in the housing [9], wherein an internal part [6] of the handle [13] presses against an end portion of the slidable rod [12] such that rotation of the handle [13] on the internal pivot [2] causes the slidable rod [12] to move;
an electric switch [10] accommodated within the housing [9];
a pressing member [8] mounted on the slidable rod [12] for activating the electric switch [10]; and
a safety press-button [3] slidably provided on the housing [9], wherein in a first working position the safety press-button [3] presses against a lateral edge of the slidable rod [12] such that the slidable rod [12] is partially constrained to move linearly and in a second working position the safety press-button [3] is spaced apart from the lateral edge of the slidable rod [12] such that the slidable rod [12] is free to move non-linearly.
a housing [9];
a slidable rod [12] slidably lies in a guiding groove in the interior of the housing [9];
an externally extending handle [13] pivotally mounted on an internal pivot [2] in the housing [9], wherein an internal part [6] of the handle [13] presses against an end portion of the slidable rod [12] such that rotation of the handle [13] on the internal pivot [2] causes the slidable rod [12] to move;
an electric switch [10] accommodated within the housing [9];
a pressing member [8] mounted on the slidable rod [12] for activating the electric switch [10]; and
a safety press-button [3] slidably provided on the housing [9];
wherein in a first working position at least one side of the safety press-button [3] orientedly presses against a lateral edge of the slidable rod [12] such that the slidable rod [12] is partially constrained to move linearly and in a second working position a sufficient room [1,11] around said slidable rod [12] is provided such that the slidable rod [12] is free to move non-linearly.