Vintage Saw question When was the first Chain Brake Used?

[pdqdl]

Nope. In fact, it's beginning to look like the internet lied to me. I'm having a hard time confirming that factoid.
My suspicions ran high when I found that was the first year Husqy made any chainsaws, and it was a model 90.

Try this: "A major breakthrough came in 1973, when Husqvarna, concerned about safety issues, created the automatic chain break. Safety standards were effectively established by Husqvarna’s revolutionary design."
https://www.husqvarna.com/au/learn-and-discover/history-of-the-chainsaw-celebrating-60-years/

 

[Bill G]

Nope. In fact, it's beginning to look like the internet lied to me. I'm having a hard time confirming that factoid.
My suspicions ran high when I found that was the first year Husqy made any chainsaws, and it was a model 90.

You see sometimes it pays to sloooooooow down, read, re-read, reflect and then post.

 

[pdqdl]

More research:


It seems that while Husqvarna might have a claim of some sort about the first chain brake, it is clear that the 1971 Jonsered model 50 did indeed have a chain brake. It also had an ignition switch that killed the engine when closed. Although I have read that it does have a clutch-brake of some sort, I have no doubt that it was somehow different enough from Husqvarna's design that still allows them to claim the first "automatic" chain brake.

https://www.acresinternet.com/cscc....068db2897db3c3ee88256b69007a1c23?OpenDocument

 

[pdqdl]

And... We have an even earlier model chain brake:

Solo 611AV (without the twin engine). 1967

Too bad this guy never operated the chain brake.


https://www.acresinternet.com/cscc....db5d4763fe7ed50c88256b5e00159090?OpenDocument

 

[Cantdog]

More research:
View attachment 1119994

It seems that while Husqvarna might have a claim of some sort about the first chain brake, it is clear that the 1971 Jonsered model 50 did indeed have a chain brake. It also had an ignition switch that killed the engine when closed. Although I have read that it does have a clutch-brake of some sort, I have no doubt that it was somehow different enough from Husqvarna's design that still allows them to claim the first "automatic" chain brake.

https://www.acresinternet.com/cscc....068db2897db3c3ee88256b69007a1c23?OpenDocument
View attachment 1119995View attachment 1119996

Yep entirely different I'm guessing......the Husky type looks to be more in line with the current "band" brakes we are now used to. The Jonsereds type was as you described with the engine cutout switch but had a one inch shoe that also pushed directly down onto the clutch drum when engaged. Was not a great design in use. A lot of the kill switches were eliminated in short order. I can't quote the exact date these were first available. They were all the same for the 49SP on up through the 66/70E and did not come installed on these saws but were a dealer only option you had to pay extra for and have the dealer install it on your new saw for you.