Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

Latest topics

» Beware of Alchem
by Archer46176 Today at 3:33 pm

» How to measure and cut leather for prod
by Celtic Archer Yesterday at 5:56 pm

» Crossbow with built in lever?
by John Edgerton Thu Aug 17, 2017 12:38 pm

» Of Bows and Torsion Engines
by JacobL Mon Aug 14, 2017 12:03 pm

» Early Lever and pin Crossbow
by topfmine Mon Aug 14, 2017 8:56 am

» Crusader crossbow
by topfmine Mon Aug 14, 2017 8:53 am

» First Efforts
by rickraedeke Tue Aug 08, 2017 5:25 am

» aluminum prod
by Phil Abrahams Fri Aug 04, 2017 8:38 am

» First whitetail buck taken with medieval crossbow
by Phil Abrahams Fri Aug 04, 2017 3:38 am

» Airsoft Crossbow
by JacobL Wed Aug 02, 2017 9:11 pm

» Questions about steel prod specs
by JacobL Mon Jul 31, 2017 8:25 pm

» Faking a medieval composite crossbow prod.
by JacobL Mon Jul 31, 2017 8:13 pm

» Airsoft Bow
by JacobL Sun Jul 30, 2017 1:56 pm

» Hello All!
by JacobL Sun Jul 30, 2017 12:54 pm

» Padre Island Bow
by Geezer Wed Jul 26, 2017 12:14 pm

» Blocked pictures by Photobucket
by Crossbowmen Mon Jul 24, 2017 1:33 pm

» Geezer website?
by Geezer Fri Jul 21, 2017 3:01 pm

» Could I get advise on order of operations?
by Bs1110101 Wed Jul 19, 2017 4:02 am

» Renaissance Sporting crossbow
by chaz Mon Jul 10, 2017 12:22 am

» Welcome! Welcome! Welcome!
by Agniznag Sat Jul 08, 2017 12:26 pm

» The Arbalist Guild - Around the World
by Agniznag Sat Jul 08, 2017 11:56 am

» opinions please
by Geezer Thu Jul 06, 2017 10:19 pm

» Hello all!
by Tarzan65 Thu Jul 06, 2017 10:54 am

» Yet another one
by Daniel Levesque Sun Jul 02, 2017 9:37 am

» Renaissance peep sight
by kenh Fri Jun 30, 2017 4:48 am


    top trigger question

    Share

    Frode
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 51
    Join date : 2011-03-17
    Location : Indianapolis, IN

    top trigger question

    Post by Frode on Wed Mar 30, 2011 8:26 pm

    Hello all,
    My first post, after an introduction, pardon any terminology gaffs.
    I've seen (in the flesh) a crossbow with a short trigger mounted on the top side of the tiller, but can't seem to find any info anywhere. It appears to be a simple lever, push the pad down and the opposite end pushes the string up off its ledge(?).
    Something like this, pardon the bad sketch.

    Is there any historical basis for this? Any drawbacks? It seems fundamentally simple, but...

    Thanks,
    Frode
    avatar
    Basilisk120
    Moderator
    Moderator

    Posts : 548
    Join date : 2010-03-01
    Age : 38
    Location : Arizona

    Re: top trigger question

    Post by Basilisk120 on Wed Mar 30, 2011 10:52 pm

    I know there are historical examples of that kind of lock. I want to say that they are more common on early oriental crossbows.

    The issues arise when dealing stronger bows. As the draw weight goes up it take more and more force to push the bow string up over the ridge. So to get more leverage the lever is going to get so long that it becomes unwieldy or the lever simply is not strong enough and bends instead of lifting the string. So for a simple light weight crossbow. Say a target or small game bow it would be fine.

    I think it would be neat to see a bow with that sort of mechanism.



    Something Something Dark Side
    avatar
    Gunnarr
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 7
    Join date : 2011-03-22
    Location : Tampa, FL

    Re: top trigger question

    Post by Gunnarr on Thu Mar 31, 2011 7:15 am

    That is the type of release on the crossbow I tried out last week. It was built by a gentleman in our local SCA group and had a lever on top you pressed down with your thumb. The lever pivoted upwards (very close to the notch) pushing the string up until it cleared the notch and sent the bolt down range. It was very tough to push down with my thumb, and almost too tough for my wife to do. His crossbow was approximately 60 pounds weight with a 10 inch draw. Your sketch is pretty close except the pivot point is much closer to the end where the string will be, say 3/4 or 7/8 of the way down the length of the lever. He got the design from someone else online, I'm not sure where.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 945
    Join date : 2010-01-12
    Age : 69
    Location : Austin, Texas, USA

    Re: top trigger question

    Post by Geezer on Thu Mar 31, 2011 11:47 am

    The top-trigger (sometimes called teeter-totter trigger) is very common on SCA combat bows. It works pretty well for lightweight bows if you plan for sufficient leverage from a stiff trigger. The only downside I see for mounting the lever on top would come from having the release in the middle of your sight picture. Of course if you're shooting big fudgy SCA combat bolts, that's no real problem. You have to elevate a bit to hit your target anyhow. The well-known 'Skane' crossbow (from Josef Alm's "Survey of European Crossbows) uses a bottom-mounted lever that can be made much longer, without interfering with sighting.
    The only printed source I have seen which shows a teeter-totter trigger is one of the the Osprey Men at Arms series. These books are usually fairly well researched, but certainly not infallible. Otherwise, All the documentable notch releases I know of (both asian and European) put the trigger or lever on the bottom. So the teeter-totter is simple... I have no doubt somebody in antiquity tried it, but the Skane bow is quite well documented, and is a proven performer. I recommend you try it instead. Geezer
    avatar
    juancheco
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 77
    Join date : 2011-03-21
    Age : 43
    Location : Buenos Aires - Argentina

    Re: top trigger question

    Post by juancheco on Thu Mar 31, 2011 7:07 pm

    I can´t resist to google it....
    Looks like the beginning of the crossbows, as simple as possible..






    Frode
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 51
    Join date : 2011-03-17
    Location : Indianapolis, IN

    Re: top trigger question

    Post by Frode on Fri Apr 01, 2011 3:59 pm

    Thanks everyone! Sorry for the delay checking back in (life). I think the bow I saw was probably a light target bow that could be modified for SCA combat bolts. Aluminum prod, too, I remember that.
    I've been asked to put together a target cross bow tiller with a simple trigger mechanism. The requester has had issues in the past with roller nut triggers (binding, wearing, etc.) and hoped to perhaps avoid that in future. Requester will be providing a prod, so I don't know quite how I'll be proceeding yet. It'll probably be in the 60 pound range.
    I'm of two minds, certainly something like the skane bow, or the teeter totter trigger look easier to make, on the other hand setting up to do a proper roller nut would be time well spent. I guess I'll know more when I learn what the weight and reaw of the prod are going to be.
    Thanks again!
    Frode

    Sponsored content

    Re: top trigger question

    Post by Sponsored content


      Current date/time is Mon Aug 21, 2017 9:22 pm