Picture of Improve Hinges on Plastic Toolboxes
Molded plastic toolcases and toolboxes are handy, but their snap together hinges sometimes come unhinged. I have one such toolbox that would unhinge each time I opened the lid. See the second photo. Getting the hinge parts back together usually requires two hands and is an annoyance. This Instructable shows my solution to the problem.

Step 1: Drill holes in the case

Picture of Drill holes in the case
Drill a small diameter hole above and below each hinge nearest to the outside edge of the toolcase or toolbox. Some plastic toolboxes have more than two hinges, but if this modification is made to those hinges nearest to the hinges farthest left and farthest right, that will be sufficient.

On many toolboxes and toolcases there is room between the hinge and part of the box to pass a wire. This makes for a tighter reinforcement of the hinge and means only one hole must be drilled. See step 7.

  • Needlenose pliers and wire cutter
  • Drill and small bit
  • Thin steel wire about 22 gauge

Hi Phil, I've used cable ties to reinforce/replace hinges - their flat profile makes them very useful for this application.

Phil B (author)  Pat Pending1 year ago
Thank you for the idea.
rimar20002 years ago
Good repairing work, Phil.

Some days ago I discovered that PET strips are ideal to stitch plastic pieces. You must cut them at appropriate width to pass trough the holes. When finished and anchored the stitch, the heat air gun completes it, shrinking the PET.
You have indeed sparked my curiosity and interest. I am like Phil. I don't know what "PET strips" but here is what I found by Googling it: http://www.alibaba.com/product-gs/1114368074/packaging_soft_flexibility_pet_strips.html?s=p
Thanks for the reply. I can use that idea.
No, graydog111, I refer to strips cut from a PET soda bottle using a scissor. I cut them about 2 or 3 mm width. These you saw are too wide to serve for that work.
Thank you rimar2000
Phil B (author)  rimar20002 years ago
Thank you, Osvaldo. I confess that I do not know what PET is.
PET stands for PolyEthylene Terephthalate, Phil, it is the main plastic used in soda pop bottles. It is thermo srinkable, so you can do many interesting and useful things wiht it.
Osvaldo, do you know if you can use soda bottles for heat shrinking, or does the bottle manufacturing process make that useless? (I guess I could just heat one up and try...)
Yes, soda bottles work very well for heat shrinking, specially the thin part.
Phil B (author)  rimar20002 years ago
Thank you for adding to my storehouse of information. You have a very interesting concept.
graydog1111 year ago
Phil, I buy cases like that (and old briefcases) at swap meets to store things in. I have nail guns in 2, auto air conditioning tools in 1,electrical tools in 1. tire repairs in1, etc, When I need to change or patch a tire, I just grab the "TIRE" case since it has everything I need.
IzNoGuD2 years ago
zip ties are more durable
Phil B (author)  IzNoGuD2 years ago
Recht herzlichen Dank! Meine Meinung, Kabelbinder sind ein bisschen zu dick und unbiegsam. Aber, Sie dürfen sie probieren. Melde mal später an, bitte.
IzNoGuD Phil B2 years ago
Funktioniert beides, ich habe gute Erfahrungen damit gemacht, besonders als kompletter Ersatz für Schaniere. Zum BeIspiel bei Kunststoffeimern und Deckeln (kann man kein Scharnier anschrauben) oder bei Holzkisten aus weichem Holz da wirkt Draht bzw. verdrillter Draht beinahe wie ein Sägedraht. Ich habe einmal ein bewegliches Hängeschild für einen Geburtstag aus einzelnen Brettern die mit Kabelbindern zusammengehalten wurden gemacht. (das Schild wurde danach recycled) liebe Grüße.
Phil B (author)  IzNoGuD2 years ago
Ja, die Kabelbindern sind oftmals eine gute Lösung des Problems.
IzNoGuD Phil B2 years ago
Melde mal später an, bitte. <-- das habe ich nicht verstanden.
Phil B (author)  IzNoGuD2 years ago
Wenn man eine Nachricht über was gibt, glaube ich das Wort anmelden ist oftmals benutzt. So hörte ich in Deutschland, "Herr Schmidt hat angemeldet er kommt nicht."
IzNoGuD IzNoGuD2 years ago
einfach haltbarer
Bill WW2 years ago
I broke the hinge on our ice chest cooler last week. Will try your method, thank you.

Or maybe I'll use PolyEthylene Terephthalate, thanks to Osvaldo. Glad you asked him what the heck is PET. He has mentioned PET before but I did not ask.
yopauly2 years ago
I have used wire for way longer than zipties existed. I use aircraft stainless aircraft safety wire and a twisting tool. The tool was purchase 40 years ago and have used it thousands of times.
iceng2 years ago
Nice one Phil.
Some plastics people are trying to fill up our refuse piles with poor designs.

BTW I personally know a local single box injection plant doing the the non-separable
hinge. The interesting thing is; as soon as the mold releases the base and top,
it must be immediately while still hot, flexed several times to make the hinge work and
last for best lifetime !

Phil B (author)  iceng2 years ago
Thanks. The inseparable box you know must cost more if it requires that kind of attention.
iceng Phil B2 years ago
A continuous operation. the gloved worker blows the box out of the mold, picks it up and flexes it while turning to drop it in the out container.