Abstract:
A hearing aid includes a housing and a battery drawer at an end of the housing which is pivotable relative to the housing and includes a protruding portion which, when abutted against a surface, will cause the battery drawer to pivot to an open position so that electric power to the amplifier in the housing is disconnected.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a hearing aid comprising a housing, an amplifier within the housing and a battery as a power supply to the amplifier, the battery being placed in a battery drawer, which is mounted pivotally, where means are provided for disconnecting the power supply to the amplifier when the battery drawer is pivoted. 
     The handling of such hearing aids is cumbersome for many hearing aid users especially those suffering from rheumatism and arthritis. The lack of ability to handle the power disconnecting mechanism may lead to a situation where the hearing aid is turned on although this is not used, e.g. during the night. This of course leads to increased and unnecessary battery consumption. 
     The objective of the present invention is to provide a hearing aid of the above-mentioned type, which allows more users to handle the connecting and disconnecting mechanism of a hearing aid. 
     SUMMARY OF THE INVENTION 
     The objective of the invention is achieved by means of a hearing aid of the above mentioned type, which comprises battery drawer comprises a protruding part which when the housing is pressed towards a surface and the protruding part is in contact with the surface may force the battery drawer to pivot and to connect or disconnect, respectively, the power supply to the amplifier. 
     As the user now do not need to manipulate the mechanism itself but only need to hold the housing which has a significantly larger volume it is possible for a larger part of the users to handle the on/off mechanism of the hearing aid. This leads to a reduction of battery consumption and hence to a better economy in use of the hearing aid. 
     In a preferred embodiment the hearing aid according to the invention comprises comprising a battery drawer locking element which allows the pivoting to disconnect the power supply. 
     The invention will be described more detailed in the following with reference to the drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a hearing aid according to the invention; 
     FIG. 2 is an exploded perspective view of the hearing aid shown in FIG. 1; 
     FIG. 3 is a front view of the housing; 
     FIG. 4 is a side view of a locking element; 
     FIG. 5 is a side view of the battery drawer; 
     FIG. 6 is a view showing the battery drawer in an partly open position, where the power supply has been disconnected; 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1 depicts a hearing aid according to the invention which comprises a generally crescent-shaped housing divided into a first shell part  1  and a second shell part  2 . At the upper end (first end) of the housing a hook  3  is mounted in an adapter part. An acoustic inlet opening  10  appears as well as a volume control  20 , an activating button  23  and a battery drawer  27 . An aperture  38  for accessing a battery terminal appears. The protruding part  56  for opening the battery drawer and breaking the power supply appears clearly. 
     FIG. 2 shows an exploded view of the hearing aid of FIG.  1 . The hook  3  comprises a circumferential recess  4  at the coupling end. It appears that the hook is mounted in an adapter part  5 , which is mounted in an aperture in the first shell part  1  and his held in place by means of two flexible legs  6 , 7  having their outer ends barbs cooperating with internal shoulders around the aperture  8  in the first shell part. The opposite end of the adapter  5  comprises four flexible wall parts separated by incisions and having internal barbs adapted to cooperate with the recess  4  in the hook  3 . 
     The first shell part comprises an acoustic inlet channel which at the outer end is branched into two opposed acoustic inlet openings (one acoustic inlet opening  10  is shown in FIG. 1) located at the sides of the first shell part. A thin protruding wall  12  surrounds each inlet opening. A the inner end the channel faces a cavity  13 , for holding a microphone suspension  14  which holds the microphone  15 . Beneath the cavity  13  for holding the microphone suspension and the microphone the above-mentioned aperture  8  for the hook adapted is situated. A receiver  17  is adapted to be placed in a receiver suspension  16 , which is inserted into the aperture and into the adapter. The outer end of the suspension forms a seal against the hook  3  when this is mounted in the hook adapter. 
     In the first shell part holding means are provided for receiving and holding a circuitry board  18  which on its side holds an amplifier  19 , a volume control  20 , a telecoil (not visible), programming terminals  21  and a switch  22  adapted to be activated by the activating button  23 . These holding means comprise holding slots  33 ,  34  (see FIG. 6) for the end areas of the board at one side edge of this. This means that the board is fixed in transversal as well as longitudinal translation and may be inserted and removed in a direction parallel to the board plane. Between the slots apertures  49  for the programming terminals on the circuitry board are provided for allowing access to these from the outer surface of the housing. At the end of the first shell part of a locking recess  50  is provided. A recess  29  is provided for receiving a terminal wall  30  being provided with terminals  31 ,  32  for contacting the battery and further terminal  36 ,  37  for external access through apertures  38 ,  39 . 
     The second shell part comprise apertures  24  for receiving and surrounding the protruding walls  12  around the acoustic inlets  10 ,  11  on the first shell part. At the opposite end of the second shell part a locking arm  25  (second end of housing having a barb  26  is provided, this locking arm providing a generally flat exposed surface. This locking arm  25  and the barb  26  together with the apertures  24  at the opposite end of the second shell part and the protruding wall  12  and the locking recess  50  on the first shell part forms the releasable locking means of the two shell parts. In the second shell part the battery drawer is mounted to be pivotable around a shaft  28  relative to opening  2   a ′ which has a portion in the side wall  2   a  of the housing and a portion in the second housing end  25 . The two shell parts may be dismantled using a tool which comprises two arms adapted to be inserted between the first and the second shell part in the area where these are mutually connected at the acoustic inlets. Upon insertion the second shell part will be expanded to a state where this may be lifted away from the protruding wall parts and hereby may be released from the first shell part. 
     From FIG. 3 the housing appears in a position where the locking element  51  is clearly visible. The locking element comprises a blind hole for insertion of an object for sliding the locking element sideways. 
     From FIG. 4 the locking element appear separately. The locking element comprises two legs  52 , 53 , where one of these  52  has a barb  54 for interlocking the locking element with the housing in a slidable manner. 
     From FIG. 5 the battery  27  drawer appears. The battery drawer comprises a first portion  27   a  and a second portion  27   b  which defines a generally flat outer surface portion  56   a  and a projecting portion  56   b  as well as a tap  55  protruding in a direction perpendicular to the axis of rotation of the battery drawer. Furthermore the protruding part  56   b,  when the hearing aid is moved towards a surface, abuts the surface, which will force the battery drawer into an open position and hence break the power supply. 
     From FIG. 6 the battery drawer appears in a position where this has been pivoted and a tap or flap on this is introduced between the battery and at least one of the contact elements in the hearing aid housing. It appears that the protruding part in this position is almost aligned with the bottom part of the hearing aid housing. 
     Starting from the position of the battery drawer in FIG. 6 the battery drawer can easily be pivoted into a closed position where the power supply is reestablished. Simply forcing the protruding part against a surface does this. Again the movement is appropriate for person having reduced ability of using their hands and fingers.