- #1
josalsam001
- 3
- 0
Hi,
I am a 24/7 carer for my wife who has Huntingtons disease. This has caused her to loose the ability to hold a cup.
I want to devise a swinging arm with a cup attatched to one end. It will be operated electricaly with a small LEGO motor that has been geared to give plenty of torque.
Imagine a gantry crane in miniture, the base of the crane will be a bearing block that is fixed under a small table, the crane tower is a 10" piece of 12mm silver steel rod that goes through a cut out in the table and is fixed in the bearing block with grub screws. Fixed at the top of the "tower" is the crane jib, it is a piece of metal tubing that is very strong and appx 2ft in length. At the end of the "jib" a cup holder will hold a cup .
The idea is when my wife wants a drink the jib will swing from a position away from her to a position where the cup will stop just in front of her mouth so she can drink through a straw.
Fixed to the end of the "tower" under the bearing block I have mounted a small lego motor that runs on a 9v battery pack. It has plenty of torque and turns the "crane" without a problem.
I used a combination of micro switches and relays with a push to make switch to control the motor.
The circuit is very similar to that used in an electricly operated curtain "drapes". system.
When the switch is pushed the motor is activated and swings the arm to the drinking position, it stops at this position by hitting a limit switch. The limit switch is a bog standard (com, no,nc) There is another limit switch that operates a latching relay to reverse polarity to the motor. When the switch is pushed again the arm will swing away until it activates another limit switch in the "park position".
This works fine, BUT!,
My wife cannot hold the switch down for very long so the arm moves in jerks.
Could some one come up with a circuit diagram that will require her to push the button switch only momentarily to start the motor, and not to keep it pushed as is the case at present.
In effect she will touch the push button, this will start the arm swinging to the drink position and stop. When she has finished drinking she touches the push button again and the arm will swing away to park position and stop ready to be used again, and so on.
I am not an electical engineer, but I am ok with basic circuits, relays, micro switches and the like. I am sure to someone who know what they are doing this will be a simple circuit, unfortunately my little grey cell is worn out so please bear this in mind![Smile :smile: :smile:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
If anyone could help I will be very grateful. I will send my email through private message if wanted.
josalsam001
I am a 24/7 carer for my wife who has Huntingtons disease. This has caused her to loose the ability to hold a cup.
I want to devise a swinging arm with a cup attatched to one end. It will be operated electricaly with a small LEGO motor that has been geared to give plenty of torque.
Imagine a gantry crane in miniture, the base of the crane will be a bearing block that is fixed under a small table, the crane tower is a 10" piece of 12mm silver steel rod that goes through a cut out in the table and is fixed in the bearing block with grub screws. Fixed at the top of the "tower" is the crane jib, it is a piece of metal tubing that is very strong and appx 2ft in length. At the end of the "jib" a cup holder will hold a cup .
The idea is when my wife wants a drink the jib will swing from a position away from her to a position where the cup will stop just in front of her mouth so she can drink through a straw.
Fixed to the end of the "tower" under the bearing block I have mounted a small lego motor that runs on a 9v battery pack. It has plenty of torque and turns the "crane" without a problem.
I used a combination of micro switches and relays with a push to make switch to control the motor.
The circuit is very similar to that used in an electricly operated curtain "drapes". system.
When the switch is pushed the motor is activated and swings the arm to the drinking position, it stops at this position by hitting a limit switch. The limit switch is a bog standard (com, no,nc) There is another limit switch that operates a latching relay to reverse polarity to the motor. When the switch is pushed again the arm will swing away until it activates another limit switch in the "park position".
This works fine, BUT!,
My wife cannot hold the switch down for very long so the arm moves in jerks.
Could some one come up with a circuit diagram that will require her to push the button switch only momentarily to start the motor, and not to keep it pushed as is the case at present.
In effect she will touch the push button, this will start the arm swinging to the drink position and stop. When she has finished drinking she touches the push button again and the arm will swing away to park position and stop ready to be used again, and so on.
I am not an electical engineer, but I am ok with basic circuits, relays, micro switches and the like. I am sure to someone who know what they are doing this will be a simple circuit, unfortunately my little grey cell is worn out so please bear this in mind
If anyone could help I will be very grateful. I will send my email through private message if wanted.
josalsam001