Introducing the second generation Ravitz Violin Shoulder Rest
This shoulder rest is now for sale via ebay.
These are sold ONLY on eBay - any listing other than this link is not mine.
The price is $60, which includes first class mail to the US and global shipping via ebay's global shipping program.
This shoulder rest is for your left shoulder (the usual right handed violin). I will make a reversed copy, for right shoulder players, on request.
If you have any questions, contact me -
Cary Ravitz, 859-263-5087, ravitz_at_ravitz.us (replace _at_ with @).
The second generation Ravitz Violin Shoulder Rest is a complete rethinking of the original, with most of the same
advantages, but in a simpler, lighter, less expensive, and smaller configuration.
Adjustment features -
The attachment to the violin minimizes interference with sound and is quick and secure.
- Malleable aluminum shoulder plate, 8.5 inches for a curved plated or 9.5 inches for a hooked plate.
- Both feet can be adjusted for height and angle along and across the shoulder plate.
- The height can be adjusted very low and very high.
- Adjustment is done via locking double hinges with a 2mm hex wrench (included).
- The violin plate grip surface is 1mm of latex tube at 45 degrees above and 60 degrees below the middle of the plate edge radius. Silicone tubes are available on request, but they are not as good at preventing sliding around the violin plate.
- The violin plate grips do not touch the violin ribs or the bottom of the plate.
- The violin plate grips pull apart and are held against the violin plate by a torsion bar spring, giving a consistent force.
If you are looking for a very high shoulder rest - I believe it is much
better to have a high chin rest and a low shoulder rest than the
reverse. When you have a high chin rest and low shoulder rest the violin
sits lower making bowing easier and it makes the violin more stable. With a high shoulder rest
any force on the shoulder plate is magnified on the plate grips by the
long lever arm, making it inherently less stable. These chin rests might
be helpful - Kreddle, SAS, Wittner Augsburg, and Messiah style. And some
people just add cork blocks under their chin rest.
This shoulder rest can be set very high on the chest/lower side to allow
for a relatively level violin,
but height on the shoulder/upper side is limited to prevent instability.
What is New
Compared to the First Generation
- Lighter - about 95 grams down to about 90 grams (depends on the shoulder plate).
- All settings are via adjustments only - no swapping of brackets and bolts is needed.
- The base is gone and the shoulder plate connects the violin plate grips.
- The ball joints have been replaced with double hinges, making it easier to adjust the foot angle and the plate tilt independently.
- The feet fold and the shoulder plate splits in half to allow the rest to easily fit into violin cases - a separate case is no longer included.
- The spring is replaced by a short torsion bar.
- The bolt in the knob that allows the shoulder plate to be split is now glued so that it won't slip after repeated usage.
- A small shelf was added beside the leg height bolt to ensure that the bolt cannot contact the violin.
- A number of parts have been strengthened - I have never had a part fail in normal usage, but there have been a couple of parts
break when a bolt is over-tightened or the shoulder rest is dropped onto a hard floor. These and similar parts have been strengthened.
- The lower half of the short shoulder plate is now the same as the lower half of the long shoulder plate - only the top piece is different. This
is so that you can switch types easily.
- The plate grip has a larger gap to the violin in between the gripping areas. This is to accomodate smaller violins.
- The width of the plate grip was reduced slightly to make it easier to fit in violin case pockets.
- Various parts have been modified to speed assembly - these do not affect function.
Installing the shoulder rest on the violin
This shoulder rest is attached to the violin similarly to many
others, but it does not install like these rests because of the spring loaded violin plate grips.
To install the shoulder rest on the violin, unfold both sides, put one of the violin
plate grips on the violin, pull out on the other grip, position it, and
release it. Make sure that the violin plate is fully seated on both sides of each plate grip.
The shoulder plate
The shoulder plate is malleable aluminum with 3 mm foam. It may
bent repeatedly to form to your shoulder or chest.
The foot assemblies
The foot assemblies connect the shoulder plate to the violin plate.
Both feet slide along the shoulder plate as needed - loosen the bolt on the side of the foot, slide the foot, and retighten.
The tightness of this bolt lets you make the leg hinges harder or easier to move.
On both feet, the first hinge folds toward the middle for storage and a bolt slides in a slot across the shoulder plate
that when tightened limits
the unfolding of the foot to set the height.
This height adjustment has five steps, minimum (0 degree) and maximum (45 degree) are set with the bolt moved to the ends of the slot.
The three middle height steps can be seen with the leg unfolded and the bolt should be centered on the appropriate step.
On the lower foot, at the free end of the hinged leg, the vertical bolt angle is set by two bolts that tighten a bracket. These need to be securely tightened.
On the upper (spring loaded) foot, the vertical bolt angle is set only by the foot location on the shoulder plate.
At the free end of the hinged leg, there is a slotted force control bracket, held by a bolt. After the vertical bolt
angle is set, the force control bracket is rotated until
the arrow is roughly centered between the stops. To increase the spring force, rotate the arrow away from the shoulder plate. The
arrow also acts to stop the rotation of the the bracket, so it should always be set to allow both up and down motion.
On both feet, the third hinge adjusts the shoulder plate tilt, i.e. the vertical bolt angle as seen from the end.
It is tightened with one bolt. Make sure that the two
plate grips are parallel when sighted from the end. This ensures that the violin plate sits securely in the plate grips.
The plate connector
The plate connector mates the two halves of the shoulder plate, tightened by thumbwheel.
The violin plate grips
The violin plate grips are adjusted to fine tune the shoulder plate height at each end.
The spin stop is linked to the plate grip and moves with it up and down the bolt.
At the appropriate plate grip height,
a thumbwheel is locked against the spin stop - this stops vertical movement and limits swiveling of the plate grip.
The plate grip moves .5 mm
vertically for each full turn.
How to set up the shoulder rest.
The basic steps to set up the shoulder rest
- Assemble the two halves of the shoulder plate into one piece -
insert the lower plate half into the connector assembly
and tighten the thumbwheel.
- The spring loaded foot should aways be the upper foot (shoulder side).
Check these adjustments before stressing the mounted shoulder rest.
- Bend the shoulder plate to fit your chest.
- Adjust the hinged legs to set the approximate height.
- Slide the foot assemblies to the approximate position on the shoulder plate.
- Adjust the lower end vertical bolt tilt to be vertical, sighted from the side of the shoulder rest.
- Adjust the tilt of the two vertical bolts, sighted from the end of the should rest, so that you get the desired tilt and the two bolts are parallel.
- Fit the shoulder rest on the violin and slide the foot assemblies so that the vertical bolts are parallel, sighted from the side of the shoulder rest.
- Adjust the spring force bracket so that the stop is approximately in the middle of its range.
- Adjust the height of the plate grips on the vertical bolts.
- Start over to fine tune everything - this is important because later adjustments can shift earlier adjustments.
- The plate grips should be parallel when sighted from the end of the shoulder rest to ensure that the violin plate fully sits
in all four plate grips vees.
- The vertical bolts should be perpendicular to the violin plate edges so that the plate grips do not touch the violin rib or bottom of the plate.
- The spring force stop should be at least halfway up the range to ensure sufficient force. If you make this too high, you will limit the opening of the plate grip, needed to install the shoulder rest.
- All bolts should be snug.
- The fixed end vertical bolt bracket has two bolts. These should be tight. This joint takes a lot of stress if you clamp your chin/shoulder and if it releases the should rest will collapse.
- The end tilt adjustments should be tight.
This shoulder rest is an original design by Cary Ravitz.
New violin shoulder rest concepts
- The feet slide along the shoulder plate for adjustment of violin position up and down the chest.
- The violin plate grips are formed by latex tube stretched over horizontal extrusions for precise geometry.
- The force of the plate grip on the violin plate is controlled by a torsion bar spring for consistent force.
- Swappable shoulder plates with different shapes and lengths.
Other Design Features
- Malleable aluminum shoulder plate.
- The upper foot is mounted on a spring loaded hinged extension to control the force of the plate grip.
- Both feet are mounted on a hinged extension that lets you adjust height and folds for storage.
- Both violin plate grips are adjustable vertically by spinning on a bolt.
- Both violin plate grips have spin limiting bars that move out of the way to allow height adjustment of the grip.
- Each violin plate grip has a left and right grip that contacts the violin plate edge at 45 degrees above and 60 degrees below the middle and a bottom stop that is normally not in contact the violin plate.
- The shoulder plate splits in half for easy storage.
Design patent on the first generation US D792506.
Note these expired patents on two of the features of this shoulder rest.
US5419226, Kun folding feet.
DE2848610, BonMusica hooked shoulder plate.
The shoulder plate is .05 inch 3003-H14 aluminum, either 1.375 in (35 mm) x 8.5 in or 1.375 in x 9.5 in.
The bolts are either M3 button head or M2.5 cap head. Both use a 2mm hex wrench. All nuts are square, thin DIN 562.
All of the plastic parts are printed (using a Lulzbot Mini) with PLA+ (polylactic acid). This is a plant based
plastic that is biodegradable.
- 1 - shoulder plate joint
- 1 - shoulder plate joint left tightener
- 1 - shoulder plate joint right tightener
- 1 - shoulder plate joint knob
- 2 - shoulder plate clamp
- 2 - base (upper, lower)
- 1 - upper foot leg
- 1 - lower foot leg
- 1 - upper foot vertical bolt angle bracket
- 1 - upper foot force control bracket
- 1 - lower foot vertical bolt angle bracket
- 2 - tilt bracket (upper, lower)
- 2 - violin plate grip spin stop
- 2 - violin plate grip spin stop lock thumbwheel
- 2 - violin plate grip
- 1 - hex wrench handle top
- 1 - hex wrench handle bottom
- 2 - M3 square nut - violin plate grip spin stop
- 2 - M3 square nut - violin plate grip spin stop lock nut
- 2 - M2.5 x 7mm cap head bolt, square nut, washer - upper, lower hinged bracket height stop
- 1 - M2.5 x 7mm cap head bolt, square nut, washer - spring force bracket
- 2 - M2.5 x 15mm cap head bolt, square nut, washer - upper, lower third hinge
- 2 - M2.5 x 15mm cap head bolt, square nut - foot to shoulder plate tightener
- 2 - M2.5 x 22mm cap head bolt, square nut, washer - lower second hinge
- 1 - M2.5 x 15mm cap head bolt, square nut - shoulder plate joint right tightener
- 1 - M2.5 x 22mm cap head bolt, square nut - shoulder plate joint left tightener
- 2 - M2 x 35mm stainless steel dowel pin - upper, lower first hinge
- 1 - M2 x 30mm stainless steel dowel pin - upper middle hinge
- 1 - 2mmid, 2.5mmod x 13mm brass tube - upper middle hinge
- 1 - M3 x 35mm button head bolt, square nut - upper foot violin plate grip bolt
- 1 - M3 x 40mm button head bolt, square nut - lower foot violin plate grip bolt
- 1 - .8mm music wire torsion bar (25.5mm between arms) - upper foot spring
- 1 - 2mmid, 4mmod x 10mm silicone tube - violin plate protector
- 4 - 2mmid, 4mmod x 7mm silicone tube - violin plate grip bottom catch
- 8 - 4mmid, 6mmod x 10mm latex tube - violin plate grip
- 2 - M3 x 10mm x 4.8mmod brass threaded insert nut (cut) - violin plate grip internal nuts
- 2 - 2.5mm id soft screw cap - violin protector on plate grip bolt
- 1 - 2mm hex key - hex wrench
- 1 - M3 x 16mm button head bolt, square nut - hex wrench
Last modified 3:52 PM, 27 Oct 2018 - File size 16K - Count 5335