B.G. Spark Plugs wrench

[Noworries]

Anybody know anything about these? 0 or O is cast at the business end with is 1"

 

[Private Lugnutz]

Did you look up the patent yet? That might provide an answer or a clue.

 

[woody 73]

just a little rant for today not aimed at the op...

Not that I hate the show me posts I like them but... Some of you guys are showing unheard of names like the above wrench from Fred W. Blackmar and just moving on( like in the the screwdrivers posts, axe posts, hammers posts , wrench posts, etc.

Now if I could only get the OP to do a little homework and look for a little history of that wrench it would make for a great post. I have given you a start take it away op.

 

[Noworries]

I didnt do this as a show me post... I originally posted it on the general tool side and got no response, link to follow. And while the above wrench is certainly not familier to me and appears to be unfamiliar to you i figured someone had to know something...

https://www.garagejournal.com/forum/showthread.php?t=461741
Heres the link to my orgional post.. and incase clicking on that link is distasteful to some here is the original post:

Aircraft (?) Spark Plug Wrench
Found this behind a work bench between the studs in my garage. I am in a rural area and there is a hanger on my property and back in the 70s/80s a couple of the folks in the area had small planes here.. When I googled BG spark plug wrench I get a couple of "vintage" hits. The box end is 1". Anyone seen or know about these??
As i would truely like to know about this wrench i welcome any questions you may have.

 

[Provincial]

B. G. Spark plugs were a leading brand for early aircraft spark plugs, through WWII. BG relied on stacked discs (washers) of mica for insulation, instead of porcelain. Since aviation spark plugs were much more expensive their automotive counterparts, they were designed with the center electrode intended to be disassembled and serviceable. The unshielded versions had the mica exposed and machined to an elegant taper. They are very beautiful!

BG supplied wrenches for installing and removing the spark plugs, and also sets of wrenches for disassembling and assembling the component pieces.

 

[Noworries]

B. G. Spark plugs were a leading brand for early aircraft spark plugs, through WWII. BG relied on stacked discs (washers) of mica for insulation, instead of porcelain. Since aviation spark plugs were much more expensive their automotive counterparts, they were designed with the center electrode intended to be disassembled and serviceable. The unshielded versions had the mica exposed and machined to an elegant taper. They are very beautiful!

BG supplied wrenches for installing and removing the spark plugs, and also sets of wrenches for disassembling and assembling the component pieces.

So is it a fair assumption this is late 30's-earilish 40's vintage?

 

[Noworries]

Did you look up the patent yet? That might provide an answer or a clue.

I have no idea how to look up patent numbers.. do uou just google them??

 

[Provincial]

Here is an image of a WWII-era 4B2 spark plug. The earlier ones were more elegant!

https://i.ebayimg.com/images/g/A2kAAOSwRfRceAht/s-l300.jpg

Here is an image of a SU455, which is a WWII-era spark plug that is more like the prewar versions.

https://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/GaMAAOSwe7pely6G/$_62.JPG?set_id=8800005007

 

[Provincial]

Because of the size of the opening, your wrench would be mid-30's to the end of WWII. This was a smaller hex than the earlier versions.

 

[Private Lugnutz]

I have no idea how to look up patent numbers.. do uou just google them??

It might come up that way. I also provide instructions in the Sticky at the top of the forum. But here is the link to the USPTO page you need. Type the patent number in the box at the top and it will bring up the patent for that wrench (owned by the Blackmar brothers Woody alluded to).

 

[Provincial]

Internet has it all!

https://bgservice.com/history.html

 

[d42jeep]

Check this link for the patent info.
https://patents.google.com/patent/US1424069
-Don

 

[wrenchguy]

I have no idea how to look up patent numbers.. do uou just google them??

Noworries man, there are alot search challenged here. Me being the MOST!
There are experts that liberally chime in and help.
nice wrench.

 

[Noworries]

Check this link for the patent info.
https://patents.google.com/patent/US1424069
-Don

Excellent!!! Thank you. That the patent search returns with an "A" at the end of the number and no "A" is on the wtench have any significance? Also, it would seem based on the submitted patent application drawing the wrench isnt a spark plug at all but simply a 1" offset box end wtench.

 

[Oldtuleguy]

They are pretty

 

[Provincial]

It looks like the patent refers to the deep offset, and that the design allowed using both the top and bottom of the opening to access the fastener. The drawing shows how the offset allows reaching a fastener that is on the bottom of a flange, with the offset allowing access when a wrench with less offset is prevented from reaching that fastener due to obstructions near the flange.

The offset would be useful in reaching a recessed spark plug, hence the use by BG.

OTG, I've always liked the look of the mica insulators. BG had a sense of style that included the rest of the plug, especially the earlier ones. I could see them used to make a charm bracelet!

 

[MR.X]

Service tools box

 

[Provincial]

Service tools box

That is Soooooo cool!