Title of Invention

PUSH-BUTTON PROVIDING TACTILE AND AUDIBLE SIGNALS

Abstract A pulse push-button comprising a tubular pusher having a wall that is housed coaxially in a tubular body to act on electrical contacts, guided in translation in the body and acted upon by a return spring, characterized in that the wall of the pusher is fitted with a cam that operates in conjunction with the active section of a hairpin- shaped spring, said spring being embedded in the body and storing energy from being flexed by the cam, the edge of the cam has at least one reversing point, said edge being entirely tracked without catching by the active section of the spring during an actuation cycle of the pusher, and the outer surface of the wall is fitted with a step associated with a reversing point.
Full Text

PUSH-BUTTON PROVIDING TACTILE AND AUDIBLE SIGNALS
The present invention relates to a pulse pushbutton comprising a tubular pusher housed coaxially in a cylindrical body and acting on electrical contacts-being guided in translation in the body ana acted upon by a return spring.
This type of push-button, also known as a single-push button, is well known. The on the pusher, which descends and commutes the electrical contacts; when the user's finger releases the pressure on the pusher, the pusher rises under the influence of the return spring and the contacts return to their initial state and the pusher regains its initial position.
The absence in known slaved pulse push-buttons of simple auditory and tactile signals indicating that the contacts have been correctly activated is disadvantageous. Moreover, quick--release push-buttons are known in the art that provide rapid commutat ion, for example by overrunning the dead center of springs. Commuting in this type of quick-release push-button is accompanied by an audible and tactile signal, but this naturally requires the presence. of a quick-release mechanism.

In known catching push-buttons, also known as push-push or double-push buttons, a cam with a catching zone that may, for example, be heart-shaped, is used in combination with a hairpin-shaped spring so that at the end of the downward movement of the pusher, the hairpin-shaped spring catches the catching zone of the cam and prevents the pusher from rising. The next time the pusher is activated the hairpin‚ÄĘshaped spring is freed from the catching zone during the downward movement of the pusher and the pusher i s al lowed to rise freely. However, this type of mechanism is dedicated to a specific catching mechanism of the type of button under consideration.
The aim of the invention is to use simple means to provide the user of a single-action slaved push-button with auditory and tactile feedback, i.e. without, quick-release , said feedback indicating the correct operation of the push-button.
According to the invention, the push-button has a wall fitted with a cam that operates in conjunction with the active section, for example the tip, of a hairpin-shaped spring, said spring being embedded m the body and storing energy from being flexed by L.M-cam. The edge of the cam has at least one reversing point; the entire edge of the cam is tracked without catching by the active section of the spring followi.j This combination of a Loop-effect cam and a step is a simple way of providing the desired auditory and tactile sensations.

The end of the spring is preferably an elbow whose radial tip is capable of striking the bottom of the step when the elbow moves past the step.
The following description is of a non-1 imitative embodiment of the invention and refers to the attached figures.
Figure 1 shows a cross-section of a push-button according to the invention.
Figure 2 is an enlarged view of detail A of figure 1.
Figure 3 is a view along B of a detail of figure 2 .
Figure 4 is a perspective view of the cam of the push-button.
Figures 5A to 5E show the various stages of movement of the cam relative to the spring during an actuation cycle of the push-button.
Figure 6 shows a variant embodiment of the cam, The pulse push-button shown in figure 1 comprises a tubular . body 10 that is generally cylindrical in shape and whose axis is shown as X. The push-button is fitted with a head 11 that is flared in relation to the barrel 12. Body 10 contains, coaxially disposed, a pusher 2 0 that is generally cylindrical in shape and composed of an upper section 20a that is flared to fit into head 11 and a lower section 20b constructed as part of section 20a, and movable within barrel 12. The pusher moves inside -body 10 so that it moves in translation along X when pressure is exerted on its upper section 20a, acting against the effort exerted by coaxial helicoidal return spring 21 while being prevented from rotating around X. The pusher is stopped in the upper position in the body by stop means (not shown). The term "cylindrical" should be understood to include prismatic or similar shapes.

The rotation of the pusher is retained and guided by means of suitable shaping such as that indicat-ed by 13 and 2 2. The pusher 2 0 is fastened to the body by a leaktight seal. 14 and comprises an inner chamber 2 3 that may be used to house an indicator lamp.
The cylindrical perimeter of pusher 20 is composed of a wall 24 whose outer surface 25 bears a cam 30 that operates in conjunction with the active section 16, preferably the radially-elbowed tip towards axis X, of a spring 15 shaped like a hairpin or simi1ar . Tip 16a located towards axis X of terminal section 16 presses against surface 2 5. The other terminal sect: ion 17 of spring 15 is embedded in housing 18 of the lower end of body 10.
It should be noted that spring 15 runs in a direction XI parallel to X the length of the wall of the cylinder of barrel 12, preferably in a groove or slot 19 cut in the wall. As will be seen below, spring 15 is acted upon by the cam such that the resulting flexion causes storage of energy that provides the desired tactile and auditory effect together with a percussive effect due to the release of the tip of the spring striking suitably-shaped surface 25.
Cam 3 0 is more or less in the shape of a parallelogram, having two sides 32, 34 chat are roughly parallel to axis X of the body and L/i/o other oblique sides 31, 33. Oblique side 33, located towards the head 11 of the push-button, is a continuous flat or convex surface and oblique side 31 of the cam, located on the other side from the head, may also have a continuous surface (see figures 5A-5E) or a discontinuous surface that offers tactile resistance (see figure 6). The cam has a reversing point 35 (an acute angle of the parallelogram) at the juncture of sides 32, 33 and another reversing point 36 at the juncture of sides 34, 31.

The outer surface 2 5 of wall 24 comprises a ramp 26a that rises slightly to guide the tip 16a of elbow 16 of spring 15 along side 31 and a dished area or similar indentation 26b adjacent to ramp 26a tr c c provides a step 27 in the region of reversing point 35. Similarly, a ramp 28a that rises slightly to guide the tip 16a of elbow 16 along side 34 and an indentation 28b adjacent to ramp 28a that provides a step 29 in the region of reversing point 36.
The push-button described above operates as follows:
The initial position is £hown in t igur e 1 and 5A. In this position, the pusher 2 0 presses against part of the body while the upper surf a c e of e1bo w 1M 1s 1ocate d in the immediate region of lower side 31 at cam 3 0 ox-is applied to this side, the spring being at rent .
When a user actuates the push-button by pressing the upper section 20a with a finger, the pusher 20 descends, and with it cam 30 (figure 5B) so that side 31 of the cam pushes elbow 16 of spring 15 to the left. The spring is flexed and remains flexed while elbow 16 slides along side 3 2 of the cam as far as reversing point 35 (see figure 5C) . When it moves past step 27 associated with point 35, the end 16a ot elbow 16 releases the stored energy and strikes the bottom of indentation 2 6b. The user then hears a sound indicating that the required action has been carried out; at the same time the user's finger feels a reaction transmitted by the cam and the pusher. Chamber 23 inside the pusher amplifies the sound.
As it rises, the pusher causes the spring to flex towards the right (see figure 5D) following the sliding of side 33 of the cam against the elbow 16. Finally, tip 16a of elbow 16 travels up ramp 28a and, when the elbow passes beyond reversing point 3 6 and the associated indentation 29 (figure 5E) , it strikes

surface 2 5 in indentation 2 8b so that the user hears a sound and feels a tactile sensation as before. It will be clear that the measurements of the reversing points, ramps and indentations may be calculated, for example, so as to stress the first indication (indentation 27) , Similarly only a single indentation may be provided.
Figure 6 shows a variant in which a discontinuity 3 7 is provided in side 31 of cam 3 0 to provide tactile resistance at the beginning of the actuation cycle. The cams given as examples may, naturally, be differently shaped.



WE CLAIM:
1. A pulse push-button comprising a tubular pusher (20) having a wall (24) that is housed coaxially in a tubular body (10) to act on electrical contacts, guided in translation in the body and acted upon by a return spring, characterized in that the wall (24) of the pusher is fitted with a cam (30) that operates in conjunction with the active section (16) of a hairpin-shaped spring (15), said spring being embedded in the body and storing energy from being flexed by the cam, the edge of the cam (30) has at least one reversing point (35), said edge being entirely tracked without catching by the active section of the spring during an actuation cycle of the pusher, and the outer surface (25) of the wall (24) is fitted with a step (27) associated with a reversing point,
2. The push-button as claimed in claim 1 wherein the fact that the active section (16) of the spring is a terminal section in the shape of an elbow whose end (16a) is capable of striking the bottom of the step (27) when the elbow moves past the step.
3. The push-button as claimed in claim 1 wherein the fact that the edge of the cam (30) comprises two reversing points (35, 36) and the outer surface (25) of the wall (24) respectively two steps (27, 29) to cause sudden release of one end (16a) of the active section (16) of the spring at each reversing point.

4. The push-button as claimed in claim 1 wherein the fact that cam (30) is more
or less in the shape of a parallelogram, having two sides (32, 34) that are roughly
parallel to axis (X) of the body (10) and two other oblique sides (31, 33), oblique side
(33) being located towards the head (11) of the push-button and having an unbroken
flat or convex surface.
5. The push-button as claimed in claim 4 wherein the fact that oblique side (31)
of the cam (30), located on the opposite side from the head (11), is provided with a
discontinuity (37) designed to give tactile resistance.
6. The push-button as claimed in claim 1 wherein the fact that the spring (15)
runs in a direction parallel to the axis (X) of body (10) in a groove or slot (19) cut in
the body.


Documents:

720-mas-1998-abstract.pdf

720-mas-1998-claims duplicate.pdf

720-mas-1998-claims original.pdf

720-mas-1998-correspondence others.pdf

720-mas-1998-correspondence po.pdf

720-mas-1998-description complete duplicate.pdf

720-mas-1998-description complete original.pdf

720-mas-1998-drawings.pdf

720-mas-1998-form 1.pdf

720-mas-1998-form 26.pdf

720-mas-1998-form 3.pdf

720-mas-1998-other documents.pdf

abs-720-mas-1998.jpg


Patent Number 208304
Indian Patent Application Number 720/MAS/1998
PG Journal Number 35/2007
Publication Date 31-Aug-2007
Grant Date 20-Jul-2007
Date of Filing 03-Apr-1998
Name of Patentee SCHNEIDER ELETRIC SA
Applicant Address 40 AVENUE ANDRE-MORIZET, 92100 BOULOGNE-BILLANCOURT.
Inventors:
# Inventor's Name Inventor's Address
1 SCHNEIDER ELETRIC SA 40 AVENUE ANDRE-MORIZET, 92100 BOULOGNE-BILLANCOURT.
PCT International Classification Number H01H13/58
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 97 04315 1997-04-07 France