SPECIFICATION
[0001] Commutator-switches such as those subject of the same applicants' European Patent
application number 90500081.6 of 3rd August 1990, that is primarily characterised
in that the common or lead-in terminal can be positioned in two of the three possible
places by merely changing the mounting position of some of its mobile parts, risks
performing unsuitably if for some reason the force of adherence of contacts exceeds
the expected system force of detachment, above all bearing in mind that, because of
the functional advantages this entails, the tendency is for the same to be placed
at the lowest possible value.
[0002] The present invention is aimed at providing the commutator-switch with a detachment
system for the lower contact (which corresponds to the cam level of smaller radius),
such being in the subject case most sensitive to the problem posed.
[0003] In this sense, systems are known to rely upon additional driving elements or the
existence of a relative linear displacement, at a right angle to the primary movement
between a driving lever tappet and a driving projection located upon a swivel-mounted
conductor element, all designed for a single mounting position of the switch.
[0004] The device subject of the invention is convenient in that being applicable to either
of the two possible commutator mounting positions it does not require an increased
force or the incorporation of additional parts, as well as performing reliably.
[0005] It comprises a projection disposed laterally upon the swivel-mounted conductor strap
against which, in the event of contacts adherence, one of both tappets provided on
the driving lever shall impinge, depending upon the mounting position in which either
tappet is active. The tappets are each located on either side of the driving levers
and spaces are provided between the sides of the swivel-mounted parts and the adjacent
insulating dividers to pass by when so required.
[0006] In the event of adherence of the lower contact, one of the the two tappets drives
the strap projection releasing the same. However, upon displacement of the commutator
to the higher position (cam level of wider radius) the tappet located outermost on
the lever passes by the side of the swivel-mounted strap when its side projection
lies beyond reach of the tappet due to the relative linear displacement, at a right
angle to the main displacement, that exists between the same, whereas when the other
tappet must act, a relative movement in the same direction as the main displacement
follows between the projection and the tappet away from each other.
[0007] Figure 1.- Is the commutator with the common point upon the right-hand terminal,
when at rest.
[0008] Figure 2.- Is the same in the higher working position.
[0009] Figure 3.- Is the commutator with the common point located between the left-hand
terminal and at the lower working position or at rest.
[0010] Figure 4.- Is the latter version in the higher position.
[0011] Figures 5 and 6.- Are plan and elevation details of the driving lever with its tappets.
[0012] Figure 7.- Shows the swivel-mounted conductor strap, the insulating dividers and
the spaces available for the tappets.
[0013] To describe a potential embodiment of the system, driving of the commutator comes
about upon angular displacement of the lever (1) about its axis (2), its driving portion
(3) moving the arm (4) on the auxiliary lever (5) as described in detail in the primary
patent. Normally, both the auxiliary lever (5) and the swivel-mounted conductor strap
(6) move simultaneously saving in the event that the contact heads (7) and (8) have
a stronger adherence force than the separation force conveyed to the strap (6) by
the spring (9) and the mediation of the auxiliary lever (5), in which event a tappet
(10) on the driving lever (1), see figures 1, 5 and 6, drives a projection (11), figures
1 and 7, laterally disposed on the strap (6).
[0014] When the commutator moves to its higher working position, figure 2, the position
of the spin axes (2) of the driving lever and (12) of the strap (6) causes the tappet
(10) to travel as regards the projection (11) towards the spin axis (2) sufficiently
for the projection (11) to lie outside the path of the tappet (10).
[0015] In the case of figure 3, the tappet (13), figures 3, 5 and 6, actually impinges upon
the projection (11) located on the hidden face of the strap (6), if the contacts (7)
and (14) remain adhered. In this layout of the commutator, when it moves to its higher
position, figure 4, the projection (11) moves faster than the tappet (13) and therefore
the same move away from one another sufficiently to take up both the safety strokes
and the constructive divergences.
[0016] In both layouts, shown in figures 3, 4, 5 and 6, lateral spaces (15) and (16) are
provided, figure 7, to allow the tappets (10) and (13) to pass freely by the sides
of the strap (6), which the dimensions of the auxiliary lever (5) also allows.
1.- A driving gear commutator-switch with two possible mounting positions of its internal
elements, as in primary patent number 8904099, characterised in having a driving lever
(1) with two tappets (10) and (13), one on either side thereof and at different distances
from its spin axis (2), and a conductor strap (6) with at least a side projection
(11) and likewise side spaces (15) and (16) for the free passage of the tappets (11)
and (13).
2.- A driving gear commutator-switch, as in the above claim, characterised in that the
spin axis (2) of the lever (1) and the pivoting points (12) and (17) of the strap
(6) and the tappets (10) and (13) and the projection (11) are laid out such that when
the commutator-switch moves from one working position to the other, the tappets move
as reagrds the projection approximately at a right angle to the primary movement in
the case of the layout when the tappet (10) furthest from the spin axis (2) of the
driving lever acts and in its same direction when the other tappet (13) must act.
3.- A driving gear commutator-switch, as in the above claims, characterised in that the
driving lever and the other elements making up the switch are the same for both mounting
positions.
