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Dismounting heavy duty truck tires at a commercial tire shop.

Explication of exemplar movie follows this paragraph. is a Quicktime(R) video with text track, entirely suitable for use as a learning adjunct in the tire trade. The title of the movie is How to Dismount a Heary Duty Truck Tire.

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From our application to the United States Office of Patents and Trademarks:

The video track depicts a solid performer skilled in the art of dismounting

heavy duty truck tires, in this case an 11.00x22 tubeless truck-tractor

driver-axle tire mounted on a one-piece aluminum wheel, dismounting a tire

from its wheel preparatory to replacing the tire with a new tire. The

performer handles one tool, known as a beadbreaker, to separate the tire from

the wheel. He performs this task in approximately 25 seconds.


How to Dismount a Heavy Duty Truck Tire is one movie depicting one task, in a

series of movies that together depict the job of replacing eight worn tires

on the two driver axles of a three axle truck-tractor. The job begins with

the task of raising the truck axles above the ground with jacks and proceeds

through the tasks of removing the wheels; rolling the wheel + tire assemblies

to a disassembly area; deflating the tires; removing and discarding the stem

and valve; dismounting the tire from the wheel; remounting a new tire on the

wheel; installation of new valve stem and valve; airing up; installing the

assemblies back on the vehicle; lowering the jacks; and stowing the used

truck tire carcasses.


The audio track is the ambient sound only, encompassing all the mechanical

sounds and background (atmospheric) sound that accompanies the performance of

the task.


The text track is in nine paragraphs, as follows:


How To Dismount a Heavy Duty Truck Tire;


Place the longhandled beadbreaker/dismounter and give it a smashing kick to

seat the tines between the tire and the wheel;


Grab the beadbreaker and give it a swift jerk upwards, followed by a long

steady pull;


Here's the tricky part: Step into the wheel with one foot, and with the

other foot administer a swift kick to the tire, near the wheel, to circulate

the lubricant;


Brace one foot against the tire, and administer a steady pull on the

beadbreaker to pry the tire over the wheel and toward you;


Note the very swift kick with a light touch that you have to do at this

point. Replay this part of the movie to get this just right;


Break the tire loose from the wheel on the "other" side, then pull and pry

the tire over the wheel;


Bring the beadbreaker straight down hard to free it from the tire + wheel.

Straight down! Don't lean back or you'll go flying;


The following are the applicants' annotations of the text track:


How to ...

the Title of the Video, similar to the titling of any moving picture.


Place the ...

the first step in the dismounting procedure; the text track introduces proper

nomenclature for denotation ("tines", "tire", "wheel" as opposed to "rim" for

example") and annotates the action with vivid expressions to connote, in this

context, forceful (as opposed to delicate) action, for example "smashing"



Grab the ...

a description of the action with vivid terms like "swift jerk" and "steady

pull" annotates the movements or "moves" that the solid performer is making,

during the actual movie frames where the action is being performed


Here's the tricky part ...

the trainee is introduced to meta-information in the text track: The video

track is clearly showing the performer's kick downwards that circulates the

lubricant, but the naive viewer of the movie will not understand this

critical physical step without hinting in the text track.


Brace one foot ...


Note the very swift kick ...

The swift kick goes by in just a few frames; it is easy to miss. The text

track advises the trainee to replay these frames ("... this part of the movie

..."); this hint self-references the playback mode that differentiates

viewing QuickTime(R) movies with text tracks from ordinary television or

streaming media.


Break the ...


Bring the ...

the advice in the text track to bring the tool straight down, "don't lean

back or you'll go flying" is in a vernacular conversational mode of speech

highlighting critical safety information. The video track depicts a

potentially hazardous task, which if performed in the manner of our solid

performer is free of serious injury; the text track has information which can

prevent on the job injury.

this is an attribution and credit that is timecoded to appear at the end of

the movie. By saving the movie file with its last frame showing, the text is displayed when the movie file is being downloaded. The text recalls synecdochically the trainee's familiarity with

Quicktime(R) videos with text tracks, to learn the means methods and

mannerisms for performing a task.


The job of removing and replacing all eight worn truck-tractor driver-axle

tires is comprised of the twelve tasks listed above:

1. Raising the truck axles above the ground with jacks

2. Removing the wheels

3. Rolling the wheel + tire assemblies to a disassembly area

4. Deflating the tires

5. Removing and discarding the stem and valve

6. Dismounting the tire from the wheel

7. Remounting a new tire on the wheel

8. Installation of new valve stem and valve

9. Airing up

10. Installing the assemblies back on the vehicle

11. Lowering the jacks

12. Stowing the used truck tire carcasses.


How to Dismount a Heavy Duty Truck Tire is task 6 in the list above.


How to Dismount a Heavy Duty Truck Tire is exemplary of all 12 task movies

that comprise the job of removing and replacing the truck tires. It is worth

noting that task 9. Airing Up requires OSHA-mandated specialized equipment,

namely a tire cage. Any tire that is being inflated in the shop has to be in

the OSHA-specified cage to prevent serious injury or death to personnel.