Model A

Ford Garage

Throttle Control Assemblies

The image above is from the 2011 Restoration Guidelines & Judging Standards, and shows the variations and evolution of the Throttle Control Assembly as portrayed in the RGJS.

Concern about accuracy of the Judging Standards Style 2 illustration and various timing dates in the Judging Standards led to further research at the Benson Ford Research Center into the design progression of the Throttle Control Assemblies. That research is on-going and not yet complete.

The following content describes the actual progression of design changes of the major variations of the Throttle Control Assemblies and their optional constructions noted on the original drawings.

RGJS Style 1 ~ Forged steel, ribbed cross section, square design bracket.

A-9725 THROTTLE CONTROL ASSEMBLY - LHD
Released: 10/24/27
EI: 3988

A-9728 One-piece forged "EE" steel bracket (ribbed)
Forged steel bell-crank (cotter-pinned)
Forged steel accelerator pedal arm (pinned)
Forged steel throttle arm (pinned)
Cylindrical throttle arm return spring (small hooks)

RGJS Style 2 ~ Forged steel, ribbed cross section, curved design bracket.

A-9727 ACCELERATOR BRACKET ASSY - LHD
Released: 4/5/28
EI: 8096
No part yet found for photo.

May have never actually been produced.

None known to exist.

Part existed "on paper" for a short time from 4/5/28 until 5/8/28.

A-9728 One-piece forged "EE" steel bracket (ribbed cross section design as illustrated in RGJS)
Released: 4/5/28
EI: 8096

Forged steel bell-crank (cotter-pinned)
Forged steel accelerator pedal arm (pinned)
Forged steel throttle arm (pinned)
Cylindrical throttle arm return spring (large&small hook)

Style 2b ~ One-piece Forged Steel Bracket, elliptical cross section (not noted in RGJS) shown below.

A-9727 ACCELERATOR BRACKET ASSY - LHD
Released: tbd
EI: tbd

A-9728 One-piece forged "EE" steel bracket (elliptical cross section design added as optional construction)
Released: 5/8/1928
EI: 8521

Forged steel bell-crank (cotter-pinned)
Forged steel accelerator pedal arm (pinned)
Forged steel throttle arm (pinned)
Cylindrical throttle arm return spring (large&small hook)

Style 2c ~ Optional Construction ~ Two-piece electric butt-welded forged steel bracket (also not noted in RGJS) shown below.

A-9725 THROTTLE CONTROL ASSEMBLY - LHD
Released: 9/12/1928
EI: 10240

Same as Style 2b except:
A-9728 Two-piece electric butt-welded (between mounting bolt holes) forged "EE" steel bracket
Released: 9/12/1928
EI: 10240

RGJS Style 3 ~ Introduction of malleable iron bracket

A-9727 ACCELERATOR BRACKET ASSY - LHD
Released: 9/28/28
EI: 10415

A-9728 One-piece malleable iron bracket
Released: 9/28/1928
EI: 10415

Forged steel bell-crank (cotter-pinned)
Forged steel accelerator pedal arm (pinned)
Forged steel throttle arm (pinned)
Cylindrical throttle arm return spring
Swaged and upset shaft "thrust washer feature"

RGJS Style 4 ~ Elimination of forged steel accelerator pedal arm

A-9725 THROTTLE CONTROL ASSEMBLY - LHD
Released: 11/24/28
EI: 11144

A-9728 One-piece malleable iron bracket
Forged steel bell-crank (cotter-pinned)
Integral steel shaft and formed accelerator pedal arm
Forged steel throttle arm (pinned)
Cylindrical throttle arm return spring
Swaged and upset shaft "thrust washer feature"

RGJS Style 4 ~ Optional Construction to be shown below.


photo not yet taken

Identical except:
Pinched pedal and throttle shaft with separate thrust washer

RGJS Style 5 ~ Introduction of integral forged throttle arm

A-9725 THROTTLE CONTROL ASSEMBLY - LHD
Released: 6/13/29
EI: 13195

A-9728 One-piece malleable iron bracket
Forged steel bell-crank (cotter-pinned)
Steel shaft with integral formed accelerator pedal arm, and integral forged throttle arm
Tapered throttle arm return spring (large&small hook)
Swaged and upset shaft "thrust washer feature"

RGJS Style 5 ~ Optional Construction shown below.



Identical except:
Pinched pedal and throttle shaft with separate thrust washer

RGJS Style 6 ~ Introduction of stamped steel bell crank

A-9725 THROTTLE CONTROL ASSEMBLY - LHD
Released: 12/30/29
EI: 15078

A-9728 One-piece malleable iron bracket
Stamped steel bell-crank (cotter-pinned)
Steel shaft with integral formed accelerator pedal arm, and forged throttle arm
Tapered throttle arm return spring (large&small hook)
Swaged and upset shaft "thrust washer feature"

Note that the timing of this engineering release is December 1929, whereas the Judging Standards place it at September 1930

RGJS Style 6 ~ Optional Construction shown below.



Identical except:
Pinched pedal and throttle shaft with separate thrust washer

RGJS Style 7 ~ Introduction of riveted stamped steel bell crank

A-9725 THROTTLE CONTROL ASSEMBLY - LHD
Released: 9/8/30
EI: 17523

A-9728 One-piece malleable iron bracket
Stamped steel bell-crank (riveted)
Steel shaft with integral formed accelerator pedal arm, and forged throttle arm
Tapered throttle arm return spring (large&small hook)
Swaged and upset shaft "thrust washer feature"

RGJS Style 7 ~ Optional Construction



Identical except:
Pinched pedal and throttle shaft with separate thrust washer shown above and below.

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January 2013