Brampton forks for HRD Vincent

of Oliver Street Works, and Rocky Lane, Birmingham,
Brampton Brothers were manufacturers of cycle chain and cycle fittings.
1874 The brass foundry business was inherited by Arthur Brampton and his two brothers.
1886 Experimented with self-lubricating bicycle chains.
1897 Established as a public company. Directors are: Ebenezer Parkes, Charles Henry Brampton, Frederick William Brampton and George Illiston. Also mentions Walter Brampton and Arthur Brampton. Employed 1,000 people. The company made chains and fittings for cycles and spring forks for motor cycles, but were also involved in other products, including chains and parts for early automobiles. The company was registered on 11 May, to take over the business of cycle chain manufacturers of the firm of the same name. 
1898 A branch chain works was opened in Calais.
1899 Patented the integral bush/inner plate chain upon which so many cycle chains have been based.
1900 Petition to wind the company up.
1904 The Brampton Chain Company of Cookley began to manufacture wheels for heavy commercial vehicles on the Ironworks site.
1913 This laid the foundation of the successful Steel Stampings when road transport developed
1915 The Calais works became the subsidiary Brampton Brothers (Calais) Ltd., which in turn developed into the Societe Anonyme des Etablissements Brampton in 1921.
The Calais works manufactured shell parts during the First World War and later produced light and heavy driving chains. New Birmingham works were erected, at Witton, after the war.
1920 September. Exhibited at the Machine Tool and Engineering Exhibition at Olympia with power transmission chains.
1925 The company was purchased by the Coventry Chain Co
2006 Cookley was called Titan Steel Wheels
please see - Graces Guide




E128 - Mills Pin 3/16" x 1"
F55 - Balance Beam
F56 - Balance beam bush
F85/1 - Headlamp bracket top
F86/1 - Headlamp bracket bottom 8"
F86/2 - Headlamp bracket bottom 7"

FF27 - damper anchor plate
FF37 - friction disc
FT124 - Head race cone
FT127 - Steering Damper stop
FT179 - Speedometer bracket 3"
FT179/1 - Speedometer bracket 5"
FT188 - Fork damper knob
FT200 - Fork link bottom RH
FT206 - Fork link bottom LH
FT207AS - Steering column assembly
FT208AS - Fork girder with bushes
FT210AS - Head clip w/bushes , clips, cone, bolt
FT213R - Top link RH
FT213L - Top link LH
FT215 - Head clip sleeve
FT216 - Fork spring screw
FT217 - Head clip bolt
FT218 - Fork spindle top
FT219 - Fork spindle bottom
FT220R - Friction plate RH
FT220L - Friction plate LH
FT221R - Friction disc RH
FT221L - Friction disc LH
FT222 - Thrust washer
FT223 - Fork damper knob screw
FT224 - Fork damper knob washer
FT225 - Steering damper knob
FT226 - Fork spindle bush bottom
FT227 - Handle bar cap screw
FT228 - Fork spindle bush top
FT229 - Top race cone shroud
FT230AS - Front fork spring complete 160lbs
FT230/1AS - Front fork spring complete 180lbs
FT231 - Front fork spring nut
FT232 - Steering damper nut assembly
FT233 - Damper spring blade
FT234 - plated washer 1/2"x .887"
FT235 - unplated washer 1/2"
FT236 - plated washer 7/16"x .762"
FT237 - Mudguard lug
FT238 - Steering  column nut
FT239 - Steering damper rubber block
FT240 - Steering damper rod
FT241 - Steering damper lock nut

91 - 1/4" BSF plain nut
92 - 1/4" BSF plain steel washer
142 - 5/16" BSF plain nut
143 - 5/16" BSF plain steel washer
147 - 5/16" single coil spring washer
321 - 1/4" steel ball
457 - 5/16" x 1" BSF hex bolt
477 - 5/16" x 3/4" x 1/16" plain washer
500 - 3/8" CEI plain nut
505 - 5/16" x 1/2" BSF hex set screw
520 - 5/16" x 1" BSF bolt
524 - 5/16" x 1/2" CEI hex set screw
796 - 7/16" BSF chamfered washer
833 - 7/16" BSW chrome
834 - 7/16" CEI plain nuts RH
835 - 7/16" CEI plain nuts LH
836 - 1/2" CEI plain nuts RH
837 - 1/2" CEI plain nuts LH
838 - 1/8" x 3/8" BSW cheese head bolt





The top washer FT236 is .7620" in diameter. The lower link washer FT234 is .8865" in diameter. They are both approximately .06" thick. The bike is an original B that has never been restored. The thickness was difficult to measure. The bike in not in a position where I can fiddle with it, so I had to do it with a depth gauge.  DavidD

Comments from 2013 Brampton fitting -
How do you remove Brampton forks from Series A/B Vincent?
Remove the front wheel, mudguard & stays, headlamp and speedo.
Remove the locknuts (834/835) from the spindles, unwind the top spindles a couple of turns each alternately until you can remove the top links.
Remove nut (833) from top of fork spring, lower fork blades and remove spring.
Then unscrew the bottom spindles until the links (FT200/206) can be removed and lift away the fork blades (FT208AS).
Remove damper knob and shaft (FT225), pull out bottom spindle (FT219), the steering damper can be removed from below.
Remove handlebar clamps and handlebars.
Loosen cotter pin nut (only on series A), loosen headclip (FT215/217), unscrew large nut (FT238) on headstem and remove top casting (FT210S).
Drop bottom casting (FT207S) with headstem to complete removal. Careful with loose ball bearings (321).
When you turn the square end of the spindles with a suitable spanner, because the ends have opposite threads, the links move away from each other !! The correct adjustment is when you can just rotate the knurled brass washers, with no side-play.  original Oilite bushes require oil, some refurbished forks are fitted with phosphur bronze bushes and grease nipples. As in my post on the VOC forum, when you have removed the top links and the nut at he top of the spring, you can lower the forks until the top of the spring is free, then untwist it to remove. When re-assembling the links, just start the right-hand threaded ones 1/2 turn, the introduce the left-handed ones at the other end. Turn each spindle just 1 or 2 turns at a time, and the links will wind in towards each other !!   Cheers, Brian

New reproduced Brampton spring from reproduced Brampton fork set is rated April 2013 on a digital tester.
starting length -
coil bound length -
Compress
distance
digital
reading
Kg/mm to
rate lbs/inch
notes
0
0
0

10mm
26.0
146 lbs/in

20mm
62.0
177 lbs/in

30mm
99.0
188 lbs/in

40mm
135
194 lbs/in
appears avg of about 194 lbs/in
50mm
172
200 lbs/in

60mm
205
194 lbs/in



When I installed the new Bramptons on a B Rapide April 2013, I developed the following steps -
I assembled all ball bearings 321, races FT128, head clip FT210S, steering column FT207S, and steering damper pieces,  no handlebars.
I put the girder assembly FT208AS and bottom links on first (no wheel to allow minimum weight).
Masking tape was put on FT207S at the ends to avoid the girder from chafing paint.
I had assembled the spring FT230AS with the top bolt FT216 just peeking out of special nut FT231, because minimum length was important.
i put a rag around the UFM steering head to avoid the new spring from rubbing the UFM
Then i screwed the spring bottom to the girder.
Then forced the spring and spring bolt/nut into upper mount of FT210S
i was unsure if i would be able to tighten this special nut FT231 and draw the bolt up into the mount.
it took some small metal tools inserted into the spring to act as a jam to keep the bolt from turning, but once it started it seemed to go easy.
then installed complete front wheel.
then lowered the bike on to the front wheel, compressing the spring a little,  allowing to tilt the Brampton, allowing me to assemble the top links.
Since the Vincent was on a "clamp front wheel work stand" with no wheel stop in place, I was able to roll the front wheel and clamp in the position needed.
I was worried about stripping threads, poor thread starts, bad threads, even spacing, messing up the square stud ends.
took my time, easy on the threads.
Both link sets, I started the right link on first about one thread, then started the left LH links.
I did all four studs with a small 5/16 open end. The hand feel using the small open end seemed important to judge how the threads were doing.
Once i completed this task, the mystery of Brampton assembly was not a mystery anymore, i feel i could disassemble and assemble like a pro now.
Cheers
Craig


Comparison of Series A Bramptons to Series B Bramptons
From an article in MPH Dec 80 by Alan Edwards and miscellaneous inputs from enthusiasts over time
Series A Bramptons
Series B Bramptons 1946-1950
Not Bushed.  Has grease nipples Bushed (presumably oilite).  No grease nipples.
Girder is shorter by 7/16 inch Girder (FT208AS) is longer by 7/16 inch.
No pin to anchor front wheel spindle nut.
Has pin (E128) to anchor front wheel spindle nut.
On bottom rear of girder, lug is tapped 5/16 inch CEI for front stand bolts.  The lugs are dimpled but not drilled (The Meteor may be an exception?). 
Two spindly lugs on front of LH front tube to carry air-pump.
No such lugs.
There is a grease nipple for the bottom front spindle behind the mudguard/balance-beam lug. No such nipple.
On the top of the girder are 2 holes tapped 5/16 CEI for grease nipples. Same tapped holes but used for the 3 inch or 5 inch speedo bracket.
Head Stem is 3/8 inch shorter. Head stem is 3/8 inch longer. 
Grease nipple to lube bottom rear spindle.
No such nipple.
Head clip has adjustable handlebar mounting lugs for 1 inch bars. Head Clip (FT210S) has fixed lugs and takes 7/8 inch bars.
A single nipple on the bracket/clip on top LH side. No such nipple.
Bottom RH Link has a 3/8 CEI hole to accept damper screw. FT200 is tapped 7/16 CEI. 
Damper screw on side has 2 threads:  3/8 and 5/16 CEI; the smaller having a couple of flats for the butterfly damper knob locked by a 5/16 CEI nut.
FT233 is 7/16 and 3/8 CEI & has a small blind hole drilled in the thread to accept the end of a grub-screw to lock the cast alloy damper knob (FT188).
Steering Damper Knob (top) is black ebonite and locked to the rod with a screwed ring similar to FT421 on the B. The same alloy casting as above is used for the steering damper knob.
Top Links vary on both only as regards the stampings (HRD or Vincent-HRD). -
Steel knurled washers. Brass (or oilite) (FT222) knurled washers.
Flat upper headlamp brackets carrying speedo and clock as required.  4-9/16 inches between centres.  8 inch headlamp.
Tubular upper headamp brackets for 8 inch headlamp.
Lower headlamp brackets are strip steel. Lower headlamp brackets are tubular but same shape/centres as A ones.
Wheel spindle has a hex head and plain nut. Tommy bar spindle and plain nut locked by the E128 pin in fork girder. 


compiled by Peter Barker 2007