Chocks (Not Chalks) as in Wheel Chocks

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MagicMtnDan

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This thread's all about chocks - what they are and how they're used, etc.

WheelChocks.jpg


The End





just kidding!
 
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MagicMtnDan

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All About Chocks

You know those little wedges you can use to keep your car's tire from rolling? They're called wheel chocks, and they could save your life. Wheel chocks are definitely one of those precautionary measures that never capture the limelight; you only realize you need them when they're not there and your car rolls away.

Wheel chocks may seem like pretty boring stuff, but they actually represent a major foundation of physical science. They're technically wedges or ramps, which are both different names for the inclined plane. There are all sorts of things an inclined plane can be used for (such as a bike ramp or an axe), but for our purposes, we'll look at how an inclined plane serves as a wheel chock.

Basically, all a wheel chock does is prevent a wheel from doing what it does best -- rolling. The physical phenomenon of friction (created by the constant exertion of gravity on everything on the planet), keeps the bottom of any wheel pressed firmly against the ground. What a wheel chock does is provide a ramp that the wheel must go up if it wants to continue revolving.

Thanks to our friend gravity, a wheel on an inclined plane will always try to roll to the bottom of that plane (say a gentle hill along your street). A wheel chock provides an opposite angle the sought by a wheel by countering the slope of your street. Voila! Your car's tires can rest easy knowing they've done all they need to do -- find equilibrium.

Wheel chocks also provide a challenge to a wheel. If there's anything a wheel naturally doesn't want to do, it's go uphill. A wheel chock presents this uphill challenge, and it doesn't matter if the hill presented is two inches or two yards, it's going to serve as a barrier and keep your wheel in place.

Choosing Wheel Chocks

Wheel chocks are a relatively cheap investment in your safety and the safety of others. Anyone who's shopped for chocks knows there are a variety of options available on the market. So which one's best for you? (The one that works :D )

Wheel chocks are manufactured in different shapes and out of different materials. All, however, are inclined planes; if used correctly, each should perform the job. Since all chocks provide a hill for a wheel to climb if it wants to roll, it doesn't matter if it's two inches or two yards high. That lack of difference pertains only to a perfect wheel, though, and tires aren't perfect wheels. They can change their shape. Tires aren't rigid, so a tire can bend around a small enough chock and continue on its roll downhill. In the case of selecting a wheel chock for tires, the bigger the better. Many chock manufacturers also specify what tire height their chocks are designed to accommodate.

Both metal and synthetic materials are often used for wheel chocks. Aluminum chocks are often designed with teeth on the bottom, which bite into the surface below and provide stability. Synthetic or rubber wheel chocks provide stability through the friction created between the non-slip material and the ground. Just about every manufactured wheel chock also has some kind of tread on its face to produce friction between the tire and the chock. Additionally, some chocks are designed with a curve that hugs the shape of the tire. Others are simple pyramids or may have a lip at the bottom to wedge firmly between the tight spaces where the rubber of the tire leaves the road.

All of these wheel chocks should do the job, but there are other requirements you'll want to take into consideration when selecting chocks for your vehicle. Because weight and gravity combine to force a wheel downhill, be sure you've got a wheel chock that can stand up to the weight of your vehicle. Most chock manufacturers specify what weight their chocks can accommodate, so be sure to check how much your vehicle can handle before purchasing.

The type of vehicle and tire you plan on chocking also make a difference in the chock you choose. Heavy, off-road tires used on large equipment like earthmovers and grading equipment require a different chock than your family sedan. Check the package to find out what kind of vehicle the chocks you're purchasing were designed to accommodate.

Installing Wheel Chocks

Whether you're changing your oil, broken down on the side of the road or some nefarious villain has cut your brake line and you managed to come to a halt before crashing headlong into an overpass embankment, wheel chocks can really come in handy. As we've learned, they provide an uphill impediment to your car's tires, and wheels don't travel naturally uphill. What's more, a wheel chock uses friction to keep your car from sliding. So they're an all-around good investment to keep in your trunk. But exactly what's the best way to install wheel chocks?

Depending on the incline of the street where your vehicle is parked, wheel chocks should be installed on the side of the wheel that faces the downward slope. If you can't figure out which way your street is sloping, or if it seems flat, it's recommended that you chock both sides of the wheel. Always use pairs of chocks in tandem along the rear tires. If you place a chock behind the rear left tire, for example, you'll want to place another chock behind the rear right tire as well. For best results, chocks should be installed on the rear wheels, as recommended by the Occupational Safety and Hazard Administration (OSHA).

wheel-chocks-3.jpg

Always place wheel chocks against the direction of the grade

When you need wheel chocks can be a matter of fate, such as when you're stranded on the side of the road. In these cases, you won't have much choice about the conditions of where your car is parked, like the gradient of the road. But if you're carrying out maintenance on your car (a situation that always calls for chocks) and you have a choice of where to park it, there're some factors you should consider.

First, look at the type of ground on which you're parked. A smooth surface like pavement or concrete will provide the most friction for the bottom of the chock to grip. Loose terrain like dirt or gravel can allow the chock (and your car) to slip and skid. Dry ground is also important; ice or rain-soaked pavement can also reduce the friction your wheel chock needs to do its job.

Second, try to find a place away from the wind or protected by windbreaks like trees or structures. A strong wind can roll a car, and you don't want that. The ideal place to park your car when using wheel chocks is on a flat, dry, smooth strip of pavement away from wind gusts.

When you're using wheel chocks, be sure to park your car and engage your emergency brake before installing the chocks. Place the chocks against the tire and make sure they're snug and in the center of the tire, never to one side or the other. Follow a similar procedure if you're using wheel chocks on a trailer you're storing (which is always recommended). Keep the trailer attached to the vehicle that's towing it. Place the vehicle in park and engage the emergency brake. Install wheel chocks on both sides of both wheels of the trailer securely. Now you can detach the trailer from your vehicle.

Taking just a moment of effort to install wheel chocks can prevent an accident that could harm or even kill you or others. And with most wheel chocks priced in the $10 to $30 range, how can you afford not to have a pair? (Every man needs a pair! :D )

Source: How Stuff Works (you didn't think I wrote all this blather about wheel chocks did you?)
 
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MagicMtnDan

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OK, let's talk about what could happen if you don't chock your wheels!

WARNING: Graphic pictures follow. Do not observe if you're squeamish! You have been warned!

Not using wheel chocks can lead to serious injuries even death. Save a tree eat a beaver oops - save a life use wheel chocks!

roadkill.jpg


One year someone didn't chock their wheels and as a result, Easter had to be cancelled! Don't be the one to cause something like that (think of all the children looking forward to the chocolates).

EasterBunnyRoadKill4406.jpg

OK, seriously now. Not using wheel chocks CAN result in bad things happening. Maybe not as bad as when you let your 13-year old daughter whom you just grounded for staying out all night with her 33-year old boyfriend sit in your truck while you're working on it. But almost as bad.

run_over_cropped.jpg

Well, maybe it's to be expected. After all you own a Dodge :D

C'mon! We're talking about wheel chocks here - it's not rocket surgery!
 
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MagicMtnDan

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You may not be old enough to remember these chocks but do not use them under your tires. They will not stop a vehicle from rolling!

chocks.jpg


Take it from the Beaver Builders...

chocks.jpg
 
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MagicMtnDan

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Originally posted by yours truly in the Hi-Lift Jack thread:

I got your wheel chocks right here. Well, they gottem:

ORTT-WheelChock.jpg

$99 each (so it says).

Tucson, AZ, July, 2009 -- Off Road Trail Tools announces the release of their exclusive
Wheel Chocks designed with the latest technology and safety as the first priority. The new line is available now at www.offroadtrailtools.com

“Since gravity isn’t always our friend, we’ve incorporated hours of engineering, design and testing to ensure our wheel chocks provide the best grip, whether on an incline, decline, pavement or dirt,” says owner, Tat Marcy. “These aren’t your typical wheel chocks.”

These original ORTT Wheel Chocks are designed with unique tooling to produce friction to grip dirt and other surfaces. Additional holding strength can be obtained by using simple tent stakes. Tested using Finite Element Analysis (FEA), 3D Deflection, strain and stress analysis, Off Road Trail Tools’ wheel chocks give you the ultimate safety features not found on any other wheel chock.

Extensively tested, the ORTT Wheel Chocks can be unfolded and laid out horizontally to double as a traction device in a sticky situation. Light-weight yet strong material allows the wheel chocks to be used while winching. Equipped with stainless steel hardware, these non-rusting, non-sparking chocks are the only choice when it comes to your safety, the safety of others and your vehicle. Designed to be compatible with today’s off-road tire sizes, the ORTT Wheel Chocks are collapsible for easy transport.

The ORTT Wheel Chocks (part #5008) are currently available at offroadtrailtools.com for $99.95.

Off Road Trail Tools is a leader in the design and manufacture of innovative tool ideas for prevention and repair for a wide-range of off-road applications. Off Road Trail Tools is committed to delivering vehicle dependent expedition reliability.

Off Road Trail Tools
7099 W Hutchs Pools Place
Tucson, AZ 85743
Phone. 520.579.2079
Fax. 520.579.2080
Web: www.offroadtrailtools.com
Email: [email protected]
 
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MagicMtnDan

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And here's another one but it's on the Chock-a-Grande size if you know what I mean:

AG083-3001.jpg


This new folding aluminum wheel chock requires only a 6"H x 101/2"W x 203/8"D area for storage. Can be stored under fire or rescue vehicles. The collapsible design allows the chock to lock in the open position simply by pulling out the back casting and pushing down. Just release the safety latch to close back to the folding position again. Convenient carrying handle makes transport and placement of chock a snap. Made of high tensile strength aluminum with rear opening, hand grip and a double row of rugged teeth to grip almost any surface. Meets applicable NFPA standards. Ship. wt. 20 lbs.

Link: www.edarley.com/finditem/15579
 

BigJ

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LOL yer killin me Dano.

On a more serious note (I know, total buzzkill) I just got off the phone with Tat of Off Road Trail Tools. They're the folks that make these: http://www.offroadtrailtools.com/shop/index.php?l=product_detail&p=462

detail_462_5008_56_1.jpg


I wanted his thoughts on how their chock would hold up to a 35" tire like ours. I was also curious how well these things gripped on dirt and on pavement. He was really friendly, and taught me more about chocks in 10 minutes than I've learned elsewhere combined. Bottom line was that their chocks were tested on a tire up to 39" in size and hold just fine, given common sense of the user! He wanted to make sure I understood that any chock will slip if not engaged with its footing surface well. In the case of their chock, they've specifically engineered teeth in the holes to provide for maximum bite off road. They also have feet that are designed to work on pavement, that spread and grab the pavement harder, the more weight you apply. And even so, he described a test a magazine ran where the only time they got the chocks to slip was on wet grass, facing downhill. When told of the slip, Tat asked the magazine if they'd used the anchor holes built into the back of the chocks foot, for just such situations? Silence greeted him on the other end of the phone... the magazine will be retesting that particular situation soon :p

I'm pretty much sold on a set of these. Yes, they're expensive (when compared to $10 WalMart jobbies). But after my experience with the Hi-Lift, and after talking with Tat about my various concerns and questions, I'm pretty sure these are in my future.
 
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MagicMtnDan

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And here's a previous post by our one and only Falcon:

Speaking of Harbor Freight:

[FONT=arial, sans-serif]2 Piece Steel Wheel Chocks[/FONT]

97429.gif

  • [FONT=arial, sans-serif][/FONT][FONT=arial, sans-serif]
  • Durable all steel construction
  • Nonslip surface for maximum friction
  • Lightweight[/FONT]
[FONT=arial, sans-serif]
[/FONT] [FONT=arial, sans-serif]Overall dimensions: 9" L x 8" W x 5" H; Face dimensions: 8" W x 8-3/4" H
Net weight: 4.22 lbs. (pair)
[/FONT]

[FONT=arial, sans-serif] [/FONT][FONT=arial, sans-serif]ITEM 97429-1VGA[/FONT]



[FONT=arial, sans-serif] [/FONT] [FONT=arial, sans-serif] [/FONT]
[FONT=arial, sans-serif]$9.99[/FONT]

[FONT=arial, sans-serif]Solid Rubber Wheel Chock[/FONT]

96479.gif

  • [FONT=arial, sans-serif][/FONT][FONT=arial, sans-serif]
  • All-weather construction for reliable performance in any climate
  • Nonslip surface provides superior traction
  • Oil resistant
  • Lightweight
  • Rubber traction pad[/FONT]
[FONT=arial, sans-serif]
[/FONT] [FONT=arial, sans-serif]Base size: 7-3/4" x 3-31/32"; Wheel contact: 7-1/2" L x 3-57/64" W; 45° slope angle; Chock height: 5-7/8"; Handle: 5-5/8" L x 1-5/16" W x 1" H
Weight: 4.7 lbs.
[/FONT]

[FONT=arial, sans-serif] [/FONT][FONT=arial, sans-serif]ITEM 96479-0VGA[/FONT]

[FONT=arial, sans-serif] [/FONT] [FONT=arial, sans-serif] $9.99 [/FONT]
[FONT=arial, sans-serif]$7.99


[/FONT]
They have a few more here, http://tinyurl.com/ykupwbw including a foldable one. I think a Raptor would mash those in a heartbeat though.

97130.gif

These are only for tires up to 26" but they give you the idea.



Falcon
[FONT=arial, sans-serif]
[/FONT]
 

fillmoreranger

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Ok... Most of us know that the stock jack is almost useless. I did notice there is (1) chock included in the Ford jack kit. I assume this chock was not made for our Raptor size tires either?

I sure learned a lot about the hi-lift jack and wheel chocks. Thanks to all who shared the info.
 

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