http://www.fundinguniverse.com/company-histories/kelsey-hayes-group-of-companies-history/
They acquired Utica Forge in 1956, and Herbrand in 1961. Though I don't have any K-H marked Cam-Loc tools (I have seen them), their acquisition of Utica would have relieved them of the need to manufacture them.
They then acquired Bonney Tool in 1964, which is also the same time that Loc-Rite was patented (also by Alfred Kavalar). (Whether this newer patent obsoleted the older Cam-Loc is unknown, but CL wrenches were still manufactured under the Bonney and Utica brands until Bonney was closed in 1994.) This would explain the existence of K-H, Utica, and Bonney Loc-Rite wrenches. Kelsey-Hayes sold their tool divisions to Triangle Tools in 1967.
But I have a guess. Because Kelsey-Hayes already was making Cam-Loc design tools, they would recognize the significance of Loc-Rite's forged design - and jump right on it! (The patent does state them as the manufacturer.) Then - when they sold the tool divisions to Triangle a few years later - their own production would cease. The 1967 Bonney catalog doesn't list Loc-Rite on any tools - not even flare wrenches. In fact, I don't know when Triangle started producing Loc-Rite tools (though I vaguely recollect a claim from a 1970 Bonney catalog that Loc-Rite was "new" then).
I'm thinking Traingle had some growing pains getting the tooling and production of Loc-Rite tools up and running for several years. (During this time they'd sell NOS K-H and Utica marked tools). I'm quite certain manufacturing the dies and pull broaches - in quantity - took serious time. Receiving a patent is one thing - putting it into production is another. However, once under way I believe Loc-Rite was exclusive to Bonney (and later, Bonney-made contract tools).
A slight tangent here.
If my assumption is true - that Loc-Rite (and possibly Cam-Loc) tools were still being sold by Triangle after the acquired Kelsey-Hayes because the tooling already exisisted - then that would also help explain certain other tools I have or have seen. For instance, take my black oxide aerospace wrenches marked Utica Loc-Rite. Since we know from their history that K-H was involved with aircraft from WW2 - and were heavily into jet engines in the 60's - it's only natural to assume they'd apply their newly-patented wrenching system to aircraft tools. The Loc-Rite broaching would have been perfect for high-torque, high-stress fasteners - in fact, it's AS954 specification rated (i.e. aerospace approved). So special wrenches were made specifically for plane engines - under their subsidiary Utica. The stylized branding of the black oxide wrenches is the same as other K-H tools I have, showing the connection. What's really surprising is these very same tools continued to be made all the way up until Bonney closed in 1994! My 1986 Bonney catalog shows these aerospace wrenches clearly marked Utica and Loc-Rite in the same stylized font.
I'm thinking that after its acquisition, Triangle kept the aerospace section tooling rolling to fill orders for the tools even though they were branded Utica. K-H had established its reputation and company contacts, so Triangle just kept the lines going, as demand was probably strong. Later on, however, this changed. The aerospace and flare wrenches in Loc-Rite were never done in metric - they were SAE only. Back in the 60's and 70's that was no biggie - AFAIK military and most domestic commercial jet engines were U.S.A. made. Unlike now where you're very likely to find foreign engines in many places. As metric fasteners became more prevalent - and more tool manufacturers started making aerospace-spec'd tools - the demand for SAE Utica tools dropped. Since Triangle had just kept the old tooling and never re-branded or modernized it, a drop in demand just meant production was rolled back.
Sad, because - if Triangle Tools had retooled and made these aerospace wrenches in metric - they would have made a killing! Though it's aerospace sales may have sagged, its automotive division would have skyrocketed. The influx of foreign cars, and modern ever-increasingly cramped engine compartments, would have car mechanics screaming to buy the tools. Snap-On calls them "high performance" wrenches - long, thin profile, zero offset, thick shank, with enhanced broaching that can reach tight nuts and bolts on cars. Basically they're just renamed aerospace wrenches!
