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

Latest topics

» My first Crossbow Tell me what you think!
by Crossbowmen Yesterday at 3:06 pm

» G/Day from Queensland Australia
by Andy. Thu Nov 08, 2018 3:15 am

» Here I go, overthinking again
by stuckinthemud1 Wed Nov 07, 2018 10:15 am

» What string material is safe for Alchem Steel prods
by c sitas Sat Nov 03, 2018 10:13 am

» what's the best glue
by kenh Thu Nov 01, 2018 1:51 pm

» Finished Crossbow - Thanks to all - here some pic and if anyone wants info let me know happy to help .
by Gnome Mon Oct 29, 2018 6:08 pm

» Advice needed re test rig?
by stuckinthemud1 Wed Oct 24, 2018 1:55 am

» yew and sinew prod help needed
by stuckinthemud1 Sat Oct 06, 2018 4:40 pm

» Ball shooting Crossbows worth the bother
by Seventeen76 Wed Oct 03, 2018 10:59 pm

» Crusader crossbow
by stuckinthemud1 Fri Sep 28, 2018 1:54 pm

» Plans and materials for my first build
by chilihook Mon Sep 24, 2018 11:53 am

» carving on early crossbows
by stuckinthemud1 Sun Sep 23, 2018 10:32 am

» invisible joints in bone spine-inlay
by Geezer Wed Sep 19, 2018 12:43 pm

» My 2nd crossbow project - german crossbow with cranequin
by MePilot1 Mon Sep 17, 2018 6:44 am

» Getting the best accuracy from a crossbow
by dutchbow Fri Sep 14, 2018 1:45 am

» Pictures of crossbow I have been build
by chaz Thu Sep 13, 2018 2:02 pm

» Sharp bend in the tickler
by Geezer Tue Sep 11, 2018 3:11 pm

» Bolt weight to prod poundage
by Geezer Mon Sep 03, 2018 7:10 pm

» Commecial slingshot crossbow
by chaz Wed Aug 29, 2018 1:20 pm

» The Arbalist Guild - Around the World
by chrisgo Tue Aug 28, 2018 10:18 am

» making my first crossbow string
by stuckinthemud1 Sun Aug 26, 2018 2:04 pm

» Looking for some help Identifying this crossbow
by Geezer Sat Aug 25, 2018 11:15 am

» Knot to secure nut twine?
by c sitas Fri Aug 24, 2018 8:28 am

» bolt rest advice
by stuckinthemud1 Mon Aug 20, 2018 4:23 pm

» what depth to Install a Prod and angle
by globalmark Fri Aug 17, 2018 11:19 am


    Pump action crossbow (powerful)

    Share

    Ivanhoe
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 2
    Join date : 2018-07-09

    Pump action crossbow (powerful)

    Post by Ivanhoe on Mon Jul 09, 2018 5:15 am

    I would love to know if a pump action crossbow exists that has reasonable power, most designs iv seen are weak due to the pump action system, but i was wondering if anyone has managed to make a powerful one maybe using cogs/gears to torque up the power.  

    thanks for having a look at my post please don't hesitate to respond.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1065
    Join date : 2010-01-12
    Age : 70
    Location : Austin, Texas, USA

    Re: Pump action crossbow (powerful)

    Post by Geezer on Mon Jul 09, 2018 7:29 am

    Years ago, I knew a guy named Floyd Stevens (Stephens?) who live in a suburb of Austin Texas.  He built a magazine fed repeating crossbow that was spanned with a pull strap.  He made both a pistol and a carbine, and the carbine showed up in low-budget action movie filmed in the Philippines.  The stock would accomodate a number of different weight prods, from a minimum of @ 75 lb, thru approx 150.  Needless to say, the light prod was used in the movie.  I know Floyd actually patented his mechanism... so it's available for perusal from the US Patent Office. It's my impression Floyd eventually sold the patent to a commercial manufacturer.  I haven heard from Floyd for 20 years, and have no idea how to get in touch, still an online search for Floyd Stephens or Floyd Stevens crossbow might bring something up.  Geezer
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1065
    Join date : 2010-01-12
    Age : 70
    Location : Austin, Texas, USA

    Re: Pump action crossbow (powerful)

    Post by Geezer on Mon Jul 09, 2018 7:37 am

    I just checked online: Floyd Stephens patented his crossbow system in 1987.  I have some photos of his pistol-model repeater somewhere on my computer.  I'll try to find them again.  If so, I'll post a notice. Geezer.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1065
    Join date : 2010-01-12
    Age : 70
    Location : Austin, Texas, USA

    Re: Pump action crossbow (powerful)

    Post by Geezer on Mon Jul 09, 2018 8:01 am

    Okay, for what it's worth, I have located my photos of Floyd Stephens' repeating crossbow pistol, with 5 shot internal magazine.  There's not a lot of detail in these photos, but if you can find the Patent Office sketches, the photos may be of some use.  Those who want the pics, drop me an e mail at : iolo@crossbows.net   I'll send you the files.  Geezer.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1065
    Join date : 2010-01-12
    Age : 70
    Location : Austin, Texas, USA

    Re: Pump action crossbow (powerful)

    Post by Geezer on Mon Jul 09, 2018 9:14 am

    Hello, Ivanhoe: Pics on the way.

    Andy.
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 82
    Join date : 2014-09-05

    Re: Pump action crossbow (powerful)

    Post by Andy. on Mon Jul 09, 2018 4:18 pm

    I could imagine a crossbow with a pump mechanism similar to the Daisy Mod 25 bb gun may work if a build is on the cards. 

    A clever "elbow" lever connected to the pump slide would reduce cocking effort.

    PierreC
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 33
    Join date : 2013-07-26

    Re: Pump action crossbow (powerful)

    Post by PierreC on Wed Jul 11, 2018 8:36 am

    I think you'll find the relevant patent drawings here: https://patents.google.com/patent/US4662345A/en
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1065
    Join date : 2010-01-12
    Age : 70
    Location : Austin, Texas, USA

    Re: Pump action crossbow (powerful)

    Post by Geezer on Wed Jul 11, 2018 9:34 am

    Yes, that's Floyd Stephens' repeater.  Actually I saw two examples, the pistol and a longer, stocked model.  Both were crafted almost entirely of aluminum, and his work was very clean.  Except for a few oddly placed screws, you might have thought they were production models.  As I said earlier, at least one of these bows was used in an action/adventure movie filmed in the Philippines, about the same time as the patent was issued.  Floyd had replaced the spanning-handle with a soft fabric strap, so the actor could span the bow with his teeth (yeah, really) Needles to say, for the film, they used a light, 75 lb. prod.  His stronger, carbine model was fitted with a 125 or 150 lb. Barnett prod... I don't recall which.  Anyhow, the machine was quite workable.  The only drawback I saw was the very short darts... those would certainly disappear into a target and have to be dug out.  Anybody else who needs photos, drop me an e mail.  Geezer.    iolo@crossbows.net

    Ivanhoe
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 2
    Join date : 2018-07-09

    Re: Pump action crossbow (powerful)

    Post by Ivanhoe on Fri Jul 13, 2018 7:50 am

    @Geezer, thanks for the images man its a work of art and for some reason i never considered a pulley system, in my head i always saw a gear / series of cogs system to ease up the load on the wielder. Some tweaking could actually turn this design into a pump action.

    @PierreC, thanks for the patent link ! Will help in the project if i ever get it off the ground.

    Sponsored content

    Re: Pump action crossbow (powerful)

    Post by Sponsored content


      Current date/time is Thu Nov 15, 2018 5:46 am