SwitchHook (V4.2 - updated 5/15/2020)

"download all" button may not work. If not, please download .stl files individually

V4.2 published. SwitchHookV-4-2-X files are the latest ones. Older files are marked as outdated or omitted (if unchanged)... V4.0, V4.1, V4.2 bodies, hooks, and center-peg systems are compatible both/all ways. see changelog for details

This is a hook tool to assist in opening doors without touching handles.

It's designed to be able to open heavy doors. Durable, long-lasting, and oversized, so you can really throw your weight behind that pull!

It has manual, inertial flip-open action, unlocked with a push-button.
When closed, the hook is mostly enclosed to minimize chance of transferring contamination such as COVID-19.
Has optional touch-screen compatible tip.
Requires NO hardware. Requires no support.
Optionally may use #10 machine screw- see assembly instructions.

Community-made-mods (such as as different center-pins and hooks) can be found in Remixes/Derivatives and in comments.

(An Updated version of my SwitchHook V3.1 , and previously Inspired by Coolioiglesias' Savegrabber , though it uses no part of its design)

Benchtop Testing

A stand-in test using UV-dye petroleum-jelly was kindly done by Do It Yourself Home Automation (Diy-ha.com). See youtube link for channel).

While we can't easily visualize viral/bacterial particles directly (or run swab culture tests), this is the next best thing. It least provides some insight on how contaminants are transferred from door -> hook -> enclosed within the handle body.

Updates section: News goes here.

6/04/2020- Added link to video of Do-It-Yourself-Home-Automation's test using UV dye Jelly

5/15/2020 - v4.2 published. New changes include a re-designed center peg system. It is stronger and easier to assemble without breaking. Also includes a touch-screen compatible hook (some assembly required). v4.2 body, non-touchscreen hooks are unchanged from v4.1. As such, I have chosen not to create an "outdated"-labeled file for v4.1 body and hooks, and just re-label as v4.2.

4/19/2020 - v4.1 is published!! New changes include all promised in v4.1 and v4.2... Namely, a keyring version, bringing back the v3.1 hook, and rounder version that can be printed with support. Time to begin working on V5.0, which will feature significant changes in size!

4/16/2020 - some problems with "download all files" not working. Have re-uploaded all files with new filenames. Hopefully fixed in a bit... If not, we'll have to download each file individually for now, and we'll make a whole new listing for future v 4.1

Features

Measures 106mm x 55mm x 23mm (4.2" x 2.2" x 0.9") when closed.

The hook accommodates:

• Round handles up to 33mm in diameter
• Keypads with keys as small as ~6mm
• Lever handles, in general.
• Those push-flap and push-bars things on doors, using the V-groove on the tip.
• Hook is NOT designed for round doorknobs.
• Optional touch-screen compatibility

Press the button to unlock the hook, which can be flipped open with a flick of the wrist. Do the same to close. Button locks the hook in the open or closed position when released.

Has non-slip texturing to help pull open heavy doors.

Does not require hardware; center peg is press-fit with some very light hammering. Alternatively, a [3/8" diameter 7/8" length] or [M10 x 25mm] screw can be used.
Center peg is removable.

Has loop for carabiner up to 11mm diameter.
Keyring versions work for keyrings up to:
[Diameter: 60mm], [(outer diameter-inner diamter): 4mm], [ring-height: 8mm].

What files to print:

QuickStart: Don't feel like reading? Just print the following:
1x SwithcHookV4-2-body-Keyring_NoSupport,
1x SwitchHookV4-2-J-Hook (not touchscreen compatible)
2x SwitchHookV4-2-Center-Peg-Half
1x SwitchHookV4-2-Center-Peg-Pin
Remember to print with 3+ outlines; the more the better on the hook.

For those wishing customization:
1)Do you want to use a carabiner?:

• Carabiner version - Allows a carabiner to be attached.
• [recommended] Keyring version - also great to be used without a keyring, since it has a round base that fits the hand quite well.

2)Choose "no-support" or "use-support" versions

• [recommended] "No-support" version recommended. Honestly, there's not much difference and no-support prints better.
• "Use-support" versions have more rounded edges where it contact print bed. However, they print a lot messier and you may need to remove support from unintended places.

3) get the body file with name of... ,

• SwitchHook-V4-2-body-XXXX-YYYY
• XXXX being "carabiner" or "keyring".
• YYYY for "NoSupport" or "UseSupport".

4) choose a hook: C-shaped or J-shaped.

• [recommended] The J-shaped one can accomodate (partially) larger things.
• The C-shaped one prevents a door handle from sliding towards and touching top of enclosure.

5) want it touch-screen compatible?

• The touch-screen compatible version has weird-looking channels that might affect strength in a minor way (could be stronger, or weaker, depending on material/printer, but not by a huge amount)

6) Get the hook file relating to whatever you want.

• SwitchHook-V4-2- ? -Hook...
• where ? is C or J, depending on style you want.
• where ? has "-Touchscreen" if it has the touchscreen option.

7) Also Print TWO of SwitchHookV4-2-Center-Peg-Half and one of the V4-2-Center-Peg-Pin

Future options/Roadmap:

If enough people enjoy this design (comment), I will continue refining to next version...
Click "Watch" to receive updates! (probably)

V4.1: Version with that nice, rounded corner end of V3.1, but with a tiny key-ring loop instead. done!
V4.2: Swivel base of the hook, but without the hook... so everyone can make their own custom hooks. done!
Version with nicer, rounded edges, but requires support. done and basically wasn't all that much difference!
V5.0: Overhaul and miniaturization to approx half width, but same size hook.

Know issues/areas of improvement for next version.

• Side edge (bottom printing face) edge is relatively un-rounded , mostly due to need for printing without support and need for a solid adhesion area.
• tolerances could be a little tighter to prevent some hook wiggle... But it might increase friction and prevent free swing-open for people with less dimensionally-accurate printers. Perhaps I could publish a tight-tolerance version...
• Not technically a switchblade, as name would imply... that would require it to be powered by a spring. This is closer to a flip-open folding knife in design.

Changelog

4.1 -> 4.2 (5/15/2020)

• added touchscreen compatible hook version
• added v4.2 center peg system.
• renamed v4.1 files as outdated.
• copied all v4.1 files as v4.2, except for the old center peg system.
• added instructions for touchscreen hook assembly, v4.2 center peg assembly, and updated print orientation, relabeled old figures, changed some description text.
• changed print instructions, removed references to old v4.1 center peg system.
• Body and non-touchscreen hooks are unchanged from v4.1 to v4.2

4.0->4.1 (4/19/2020)

• increased rounding on edges on all versions
• created keyring version, and no-support versions of both versions.
• added a block to prevent a too-far-seated pin wedge from getting stuck inside groove of the center pin hole of enclosure.
• brought back the v3.1 hook.
• created hook base for anyone to edit, with boundaries outlined.
• added pad to the printed "pillar" of the printed next to the button, for no-support versions, that constitutes the top-right of the face of enclosure on button side.. Should help with adhesion. can be cut off easily enough.
• added a few clauses to the legal terms.

3.1 -> 4.0 (4/15/2020)

• Locking Mechanism durability is vastly (300%?) improved. Also added sloped surfaces for softer transitions between locked and unlocked states.
• Now prints without support!
• Bottom claw of hook removed, allows for slightly larger things to be hooked, though not completely "in" the hook.
• Button's cantilever is now internal, hidden behind front panel. Extra cool, I think.
• Completely re-designed central pin.
• Added carabiner loop hole.
• Reduced gap between walls and hook, given new central pin design.

Let me know if there are any mistakes in design. This is a work in progress which I thought is better to be "out there" than perfect

PRINT SETTINGS

Print with 30%+ infill, recommended PETG

3+ outlines for the hook. More hook outlines is better- maybe even 5 or 6.

The weakest link is the shaft of the hook, which limits how much force one can pull with. Breakage occurs with the inside wall of hook failing under tension... Therefore, it will probably be as strong as the number of walls (e.g. 6 walls are twice as strong as 3 walls, and thrice as strong as 2 walls). Worth using more plastic on that one component.

Print with support in following orientations:
Hook: with the edge that surrounds the pivot point on print bed.
Enclosure: With the opening facing up, side of button down. This ensures the button lever will bend properly.
Central pin: Print with flat face down.
Pin-Wedges: Print with triangle-marked face down.
See picture on correct orientation.

POST PRINTING

tldr version: Go see the assembly picture.

1- Place hook into enclosure: Hook goes with spine facing out, hook-point facing inwards.
2- Examine the central pin hole. Note that it is a D in profile, with a notch in also cut out of the flat part of the D. We will be orienting by drawing references to the letter.
3- Insert one side of the center peg half, noting the flat side of the peg goes toward the flat side of the D. Repeat with other center peg half.
4- Center peg pin. One side is pointy.
5- Insert pointy side into gap/hole between the two peg halves.
6- Hammer them down until flush with surface.
7- if removal is needed, punch out center pin using a thin tool. Once a bit of the pin is out, remove using pliers, or stick a flat-head screwdriver in the middle "gap" and pry out.

4 (hardware alternative) - Insert in a #10 x 3/4" machine screw (or two #10 x 3/8 or 1/4 on either end) into hole and screw in. Two shorter (3/8 or less) wood screws of between #12 and #8 might work in a pinch. untested.

LICENSING AND RIGHTS

This design is available freely under Creative Commons Attribution-NonCommercial-ShareAlike license.

This license lets anyone remix, adapt, and build upon this work non-commercially, as long as they credit me and license their new creations under the identical terms.

I further stipulate the following terms:
(a) non-commercial use of this design is defined as <$7,500 USD yearly revenue originating from sale or use of this design. Should commercial use be of interest, please contact me. I will further support and enhance this design, and a small royalty-based licensing arrangement can be negotiated.
(b) credit must be provided for all previous designers involved in a remix or adaptation. For example, a remix of a remix must credit both the original designer and the first remix designer.
(c) should there be interest in commercial use (as defined in (a)), and in the case of multiple designers (for example, a remix wishes to pursue commercial use), each designer involved has the right to refuse the use the design for commercial use. Each designer must be contacted with a bonafied attempt to notify them of intent to commercially use the design no later than 30 days after passing the $7,5000 USD revenue mark. After which the notification has been sent, each designer has 60 days to exercise their right for refusal of commercial use. Alternatively, a designer may be relinquish this right in other written agreements. Any profits (given costs are calculated at fair market price) originating from revenues beyond $7,500 USD must be donated to the Electronic Frontier Foundation in the event of any designer's refusal of commercial use.
(d) Any individual or entity that appears to have revenues >$2500 USD utilizing this design or any derivative agrees to provide, upon request of any previous designer, information regarding revenue received and volume of sales/services in relation to the sales or use of this design within 30 days of such a request. A designer may request this twice every 60 days.