looking for linear actuator with return spring - Electronic Circuits Projects Diagrams Free

jimbo1212 · 27th February 2009, 10:21 PM

I am looking for linear actuator with a return spring the retracts the shaft when power is interupted. The shaft travel only needs to be 5 inches and the actuator can be AC or DC. 15lbs or less of thrust should work for my application.

I am aware of rotory actuators with a return spring but that won't work for my application.

Thanks,

Jim

Mike2545 · 27th February 2009, 11:27 PM

Have you thought about compressed air?

What about a solenoid?

jimbo1212 · 28th February 2009, 03:57 AM

I did not want to deal with air.

Mike2545 · 28th February 2009, 04:19 AM

Is the speed that pneumatic cylinders travel, or don't you want to run a compressor?

If it's a speed issue you can run air over oil to get the speed just right.

mneary · 28th February 2009, 08:23 AM

How fast? Is a lead screw permissible? I guess not, if a spring has to be able to return it on power interruption.

That's a pretty tall order for a solenoid or similar device. Can you consider a 75-lb pull (1" throw) solenoid with a 5:1 lever?

picbits · 28th February 2009, 10:23 AM

What country are you located in ?

KMoffett · 28th February 2009, 04:32 PM

With a DC motor driven linear actuator, you could have a backup battery...and a circuit to detect power failure, drive the actuator home, and shut down.

Ken

jimbo1212 · 2nd March 2009, 03:57 AM

I was hoping to avoid the pluming involved with using air plus having a supply of air. Electrical solenoids have been attempted previously by others with mixed results. The solenoids tended to burn-up over time when used with a level system due to either excessive resistance or jamming. My goal was to allow the spring to retract the shaft when power was interrupted.

Mike2545 · 2nd March 2009, 04:01 AM

Plumbing is not a real issue with these
John Guest 3/8" x 1/4" MPT Quick Connect Fitting - eBay (item 290026450742 end time Mar-23-09 07:52:12 PDT)
I guess the real problem would be the air thing, but probably the one I would choose.

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27th February 2009, 10:21 PM	#1
jimbo1212	looking for linear actuator with return spring I am looking for linear actuator with a return spring the retracts the shaft when power is interupted. The shaft travel only needs to be 5 inches and the actuator can be AC or DC. 15lbs or less of thrust should work for my application. I am aware of rotory actuators with a return spring but that won't work for my application. Thanks, Jim

27th February 2009, 11:27 PM	#2
Mike2545	Have you thought about compressed air? What about a solenoid? __________________ Mike2545

28th February 2009, 03:57 AM	#3
jimbo1212	I did not want to deal with air.

28th February 2009, 04:19 AM	#4
Mike2545	Is the speed that pneumatic cylinders travel, or don't you want to run a compressor? If it's a speed issue you can run air over oil to get the speed just right. __________________ Mike2545

28th February 2009, 08:23 AM	#5
mneary	How fast? Is a lead screw permissible? I guess not, if a spring has to be able to return it on power interruption. That's a pretty tall order for a solenoid or similar device. Can you consider a 75-lb pull (1" throw) solenoid with a 5:1 lever?

28th February 2009, 10:23 AM	#6
picbits	What country are you located in ?

28th February 2009, 04:32 PM	#7
KMoffett	With a DC motor driven linear actuator, you could have a backup battery...and a circuit to detect power failure, drive the actuator home, and shut down. Ken __________________ "To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931)

2nd March 2009, 03:57 AM	#8
jimbo1212	I was hoping to avoid the pluming involved with using air plus having a supply of air. Electrical solenoids have been attempted previously by others with mixed results. The solenoids tended to burn-up over time when used with a level system due to either excessive resistance or jamming. My goal was to allow the spring to retract the shaft when power was interrupted.

2nd March 2009, 04:01 AM	#9
Mike2545	Plumbing is not a real issue with these John Guest 3/8" x 1/4" MPT Quick Connect Fitting - eBay (item 290026450742 end time Mar-23-09 07:52:12 PDT) I guess the real problem would be the air thing, but probably the one I would choose. __________________ Mike2545