FR2535084A1 - Control pedal with oscillating cap - Google Patents

Abstract

The invention relates to a control pedal permitting its use without a predetermined position of the foot. It is constituted by a base 1 receiving the manoeuvring means, especially the shaft 3 and the element 7 to be controlled, the shaft 3 is surmounted by the oscillating cap 2 especially in the form of a spherical sector transmitting, via the manoeuvring means 4, 5, 6 and 15 the force to be applied to the element 7 to be controlled. The control pedal according to the invention is particularly intended for hydraulic, pneumatic, electric, electronic, optoelectronic opening or closing.

Description

 The present invention relates to a method and an apparatus for monitoring the moisture content of the environment at a given point.

 The invention relates more particularly although not exclusively to the control of an industrial drying operation in which parameters are controlled by reference to the measured moisture content of the exhaust gas.

 At a time when the comoustiole is expensive, it is enormously very desirable to ensure that the parameters are controlled in a precise manner so that the operation can be carried out with the maximum output, but it is a fact recognized by the experience that hygrometers and other moisture-sensitive devices tend to get out of control over time due to atmospheric contamination.

 Attempts have hitherto been made to improve moisture-sensitive devices so as to suppress or lessen their tendency to out of balance, but these attempts have not been completely successful, and an alternative approach has been sought.

The subject of the invention is a method for controlling a process or uste operation by means of a control signal as a function of the humidity content of the environment in the vicinity of a device sensitive to humidity capable of producing an output signal as a function of said moisture content and of the state of the device, this process being characterized in that a control signal is produced in response to said output signal according to a predetermined relationship, and the relationship is varied in accordance in the state of the device
sensitive to humidity.

The invention also relates to an apparatus,
comprising a device sensitive to humidity, for com
signal a process or operation by signal
depending on the humidity content of the variable position support according to the position of the force on the cover.

 The invention having been explained in its general form, other characteristics, aims and advantages thereof will emerge from the following description with reference to the accompanying drawings, which by way of non-limiting example, a mode of achievement; in these drawings which form an integral part of the present description.

 - Figure 1 is the sectional view along a diametrical plane of the control pedal.

 - Figure 2 is a view of the cam mounted on its axis out of service without the action on the cover, Figure 2a with action on the cover.

 - Figure 3 is a view of the cam my tbe on its axis, in service without the action on the cover, Figure 3a with action on the cover.

 - Figures 4 and 5 illustrate other non-exhaustive embodiments in section along a diametrical plane ds the control pedal.

 The control pedal, according to the invention which is shown by way of example in the figures, essentially comprises the following parts which can be seen in FIG. 1: a base (1) an axis (3) mounted on the base ( 1) a double cam (4) sliding on the axis (3) a spring (5) for resetting out of service, a ball joint (6) mounted in the cover (2) the double cam (4) acting on the element to order (7).

 The base (1) that can be seen in Figure 1 is preferably cylindrical substantially in the shape of a washer, has in its center the means for fixing the axis (3) which can be a threaded insert (8) , around its center four times two fins (9) highlighted in FIG. 1, intended to prevent rotation of the cover (2), four zones (yin) for fixing the element to be controlled (7), which can be inclined plane so as to have a double cam angle (4) allowing an improvement in the coefficient of friction between the contact of the element to be controlled (7) and the lower conical trunk part of the double cam (4) , moreover three of the zones (10) are arranged to receive standard control elements (7): pneumatic valve for gas or vacuum, hydraulic valve for liquids, switch for electricity, sound and others, the fourth zone (10 ) can receive a special arrangement. The underside has clearances to accommodate non-slip pads (11). Entrances (12) around the perimeter will allow possible fixing by means of hexagon head screws.

 The cover (2) -is préfsnciellerent a sph8rique sector, having in its center a cylindrical entry (13) intended to receive a ball joint (6). The cylindrical inlet (13) can receive a retaining means for the ball joint (6) in the form of a ring (14) thus allowing the cover (2) to be joined together; around the inlet (13) a cylindrical flange (15) with a slightly convex surface having the function of transmitting on the double cam (4) the force applied to any part of the cover (2), a fin (16) highlighted in Figure 1, the housing is in one of the groups of soft fins (9) of the base (1) intended to prevent rotation of the cover (2) around the axis (3). The external part (20) of the cover (2) can advantageously be striated in order to avoid sliding of the foot, on the periphery a clearance (17) allows the passage of the input and output members connected to the element (7) to be controlled, the part hood informator (2) generally having the shape of a ring, delimited by the spherical sector, can advantageously be fitted by a bearing (18) intended to receive a seal (19) for sealing against dust.

 The axis (3) which is shown by way of example in FIGS. 1, 2, 3, 4 and 5 essentially comprises: a threaded part (21) allowing attachment to the center of the base (1) of the control pedal , the filmed part can advantageously be terminated by a hexagonal flange (22) allowing the blocking of said axis (3) on the base (1) the diameter of the axis with free fatty adjustment allows the sliding without play of the double cam (4) the part of the axis used to receive the ball joint (6) can be threaded or adjustable (23) depending on the type of ball joint (6) used.

 The double cam (4) has in its center a cylindrical hole intended for the passage of the axis (3) and two conical trunk parts. Said double cam (4) may be in two parts. Figures 2 and 2a highlight a double cam (4) mounted for normally closed control element (7); whereas FIGS. 3 and 3 bis show a double cam (4) mounted for the same element to be controlled (7) normally open, with or without action on the cover (2); on the flat face below or in the recess, depending on the mounting used, a compression spring (5) is used to move the double cam (4) away from the element to be controlled (7) when the force ceases to be applied on the cover (2) the cover assembly (2) ball joint (6) double cam (4) is returned to its original position in the rest state. Of course, the invention is not limited to the terms of the preceding description but includes all of its variants.

Scope
Pedal intended for starting and / or stopping machines or devices requiring a foot control.

Non-limiting examples:
- Electric or pneumatic screwdriver
- Dentist's cutter
- electric sewing machine
- Pneumatic clamp.

Claims (4)

 i) - Control pedal comprising a cover (2) oscillating around a ball joint (6) mounted on a vertical axis (3), the said axis (3) being fixed in the base (1) of the pedal by means of '' a threaded insert (8), a force applied at any point of the cover (2) generates an oscillating movement of said cover, which movement is transmitted via the flange (15) to a double cam (4) which directs the movement and acts on the element to be controlled (7).  2) - Control pedal according to claim 1 characterized in that the cover (2) oscillating has a symmetry of rotation around the axis (3), a fin (16) of said cover (2) housed freely between two fins (9) integral with the base (1) circular, avoids a rotational movement of said cover (2) around the axis (3) more said cover (2) has a clearance allowing the passags of orqanes of input and output of the element to be controlled (7).  3) - Control pedal according to the resale cation 1 is characterized in that the double cam (4) free on the axis (3) is made up of two parts, the lower part being able to be reversed thus allowing the reversal of the function of the control element (7) a spring (5) now there is no control the double ball joint assembly (6) cover (2) in the high position.  4) - Control pedal according to any one of claims characterized in that the cover (2) the base (1) the cam (4) double and the ball joint (6) can be produced by injection molding operation.