Nesting Hex Insert Wrench - One Ring Head for Many Bolt and Nut Sizes

The problem

Hex bolts and nuts come in many sizes, so a worker needs either a row of combination wrenches or a socket set with a ratchet. Open-end wrenches grip only two flats and can slip and round the corners of a tight nut. Sockets grip all six flats but each size is a separate heavy part. According to the patent, the aim is one wrench that loosens and tightens hex bolts and nuts of several sizes without slipping and rounding them.

The solution

1. The handle (5) ends in a ring with flat faces on both sides.
2. A toothed sleeve (1) sits in the ring, held by a lower press ring (8) and an upper press ring (4) screwed to the two faces. The sleeve’s inside is a regular hexagon; its outside carries rectangular teeth all the way round.
3. Inside the sleeve sits a hex insert group (2): several thin hexagonal tubes nested one inside the next. The outside of the largest matches the sleeve’s hex; the outside of each smaller tube matches the inside of the tube around it. Each tube’s inner hex fits one bolt or nut size.
4. A pawl (7), mounted on a pin (6), presses against the insert group to keep it in place.
5. A shift fork (3) on the handle near the ring engages the sleeve’s teeth so the handle turns the sleeve and the inserts.
6. Each insert has a round-hole cover on the side away from the pawl, and the handle’s far end is a stepped round grip with knurling.

Who it is for

• Hand-tool brands looking for a distinctive multi-size wrench for retail tool walls and gift sets.
• Bicycle, motorcycle and small-engine accessory sellers whose customers need a few metric sizes in one compact tool.
• Facility maintenance and utility suppliers equipping crews who want fewer tools on the belt.
• Promotional and roadside-kit companies building compact kits for cars, RVs and boats.

How it works

The main parts

Using it

1. Smallest size - with all inserts in place, the innermost hex fits the smallest bolt; place the head over it and turn.
2. Step up a size - release the pawl and push out the innermost insert; the next insert’s hex is now the working size.
3. Keep going - remove inserts one by one for larger sizes; the largest size is the sleeve’s own hex.
4. Store - put the inserts back inside each other; the whole set lives in the wrench head.

Applications

Bicycle and motorcycle tool rolls

Riders need a handful of nut sizes; one head with nested inserts replaces several wrenches in a saddle bag.

Car, RV and boat emergency kits

A compact, light tool covers the common nut sizes for battery terminals, clamps and brackets.

Furniture and equipment assembly

Assembly crews meet a few bolt sizes over and over; changing an insert is faster than swapping wrenches.

Facility and utility maintenance

Technicians who climb ladders or work in tight spaces carry one tool instead of a ring of wrenches.

Gift and novelty tool sets

The nesting-doll idea is easy to show in packaging and works as a gift item for DIY customers.

Where it is less suitable

• Very high torque - thin nested walls cannot match a heavy one-piece socket on seized truck or construction bolts.
• Deeply recessed nuts - the ring head works on accessible bolts; long studs need deep sockets.
• Professional fast work - a ratchet with a socket rail may be quicker when sizes change constantly.