Opening deadbolt/stepper motor

[Sravan]

Hey guys,
I'm trying to setup a motor on the inside of my door to open a deadbolt
by turning the lever on the inside part of the door, as one would turn
by hand when opening the door normaly. How would i setup a motor to
open the door? ie. turn the rotational motion of motor into linear to
open/close deadbolt?

[BruceR]

It's easier to use and electric strike.

From:Sravan
sravanmx@gmail.com

> Hey guys,
> I'm trying to setup a motor on the inside of my door to open a
> deadbolt by turning the lever on the inside part of the door, as one
> would turn by hand when opening the door normaly. How would i setup
> a motor to open the door? ie. turn the rotational motion of motor
> into linear to open/close deadbolt?

[B Fuhrmann]

"Sravan" wrote ...
> I'm trying to setup a motor on the inside of my door to open a deadbolt
> by turning the lever on the inside part of the door, as one would turn
> by hand when opening the door normaly. How would i setup a motor to
> open the door? ie. turn the rotational motion of motor into linear to
> open/close deadbolt?

There are all sorts of ways to move a deadbolt but you probably do not want
to move it directly, unless you don't want the knob or key to work.

Normally, the knob moves the deadbolt directly and the key moves the knob.
The key is loosely connected so that the knob can turn without the key
turning but they key, when turned far enough, will turn the knob and then be
turned back to the loose position when you take the key out..

The easiest method that I can come up with based on a stepper in the door
would be an external tab attached to the knob shaft and a ring with a
matching notch that can turn the knob when turned far enough and let the
knob turn freely when it is centered.
Your stepper turns the ring (with a belt, chain, or gears) to move the knob
and belt, then returns to the neutral position.
You will need some sort of sensor to indicate when the knob is in the open
and/or closed position. You can count steps on a stepper to determine
position but they can loose their "knowledge" of position if something jams
against them so that they don't move one step per pulse.
You will need some sort of logic to handle things if the bolt does not move
(or get a stronger motor) right away due to friction or a jam. Otherwise
your motor could be left running for a long time trying to move a bolt that
doesn't want to move.

Most commercial units do not try to move the bolt. Much easier to put a
solenoid on the strike. By working on the other end of the system, you
avoid the extra mechanisms that are needed to allow the key and knob to work
in addition to the automation.

[Robert L. Bass]

> Sravan wrote ...
>> I'm trying to setup a motor on the inside
>> of my door to open a deadbolt
>
> Most commercial units do not try to move
> the bolt. Much easier to put a solenoid on
> the strike...

This is true. It is easier to install a solenoid operated strike than a
motorized deadbolt. However, deadbolts usually offer greater security.
There are motorized deadbolts on the market so unless the gentleman wants to
do this for the sake of the exercise, it will be easier to just buy one.
Following are examples from several major lock makers. Some require
external power, which is connected to the door via a replacement hinge.
Others are battery operated.

http://www.abloy.com.au/verve/_resources/8154_Motor_lock%7B78163%7D.pdf
http://www.locknetics.com/pdf/400%20Series%20Cabinet%20Locks.pdf

The Locknetics models are moderately pricey. I carry Locknetics so I'm
somewhat biased in their favor. I don't know if Abloy is good or otherwise,
but I assume they're on a par. There are several other manufacturers making
motorized deadbolts as well.

--

Regards,
Robert L Bass

=============================>
Bass Home Electronics
2291 Pine View Circle
Sarasota · Florida · 34231
877-722-8900 Sales & Tech Support
http://www.bassburglaralarms.com
=============================>

[SQLit]

"Sravan" <sravanmx@gmail.com> wrote in message
news:1105781212.437122.193070@f14g2000cwb.googlegr oups.com...
> Hey guys,
> I'm trying to setup a motor on the inside of my door to open a deadbolt
> by turning the lever on the inside part of the door, as one would turn
> by hand when opening the door normaly. How would i setup a motor to
> open the door? ie. turn the rotational motion of motor into linear to
> open/close deadbolt?

49.99 from heartland item # C1-80381 or ****82 page 31 of last catalog I
got

[B Fuhrmann]

> "Sravan" wrote ...

> 49.99 from heartland item # C1-80381 or ****82 page 31 of last catalog I

You have to tell us how to find "heartland"

[Anthony Fremont]

"B Fuhrmann" <b-fuhrmann-usenet@mplsfridayDELETEskate.com> wrote in
message news:10uilg98nu6k292@corp.supernews.com...
> > "Sravan" wrote ...
>
> > 49.99 from heartland item # C1-80381 or ****82 page 31 of last
catalog I
>
> You have to tell us how to find "heartland"

Try here:
http://www.heartlandamerica.com/item/default.asp?SKU=80381#