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McKISSICKSHEAVES

McKissick® Sheaves

W i t h P r o d u c t W a r n i n g s a n d A p p l i c a t i o n I n f o r m a t i o n

Copyright © 2016 The Crosby Group LLC All Rights Reserved278

Remember: “When buying Crosby, you’re buying more than product, you’re buying Quality.”

Remember: “When buying Crosby, you’re buying more than product, you’re buying Quality.”

HISTORY & EXPERIENCE The ability to match the sheave design and manufacturing process to meet the application requirements requires experience. It also requires the ability to creatively use this experience and manufacturing resources to provide the best solution.

DELIVERY & ACCESSIBILITY M any energy and lifting sheave applications require short delivery times and delivery to locations around the world.

es onse ti es re ire e i le an a t rin reso r es Access around the world requires not only logistics experience and capabilities, but also requires manufacturing resources strategically located around the world.

FLEXIBILITY OF DESIGN M atching the best solution to the application requires the ability to fabricate sheaves by a number of processes:1) Heavy Duty – R oll forged sheaves are hot forged with no

splitting stresses at base for sheaves up to 78” .2) Heavy Duty – Closed die forged sheaves with machined

Wireline groove for sheaves up to 16 ” .3 ) E xtreme Duty – R oll forged sheaves with welded dome

reinforcement employ the latest welding technology with no shape cross brace stress concentration areas.

4 ) Heavy Duty fabricated sheaves – With welded rings and reinforced webs utilizing the latest welding technology.

5) The ability to provide sheave grooves with 3 0 , 3 5 and 4 5 e ree rofiles as ell as other s e ial rofiles

6 ) The ability to provide bearings to match application: Plain bore, bronze bushed, roller bearings, tapered roller bearings and full complement bearings.

7) Heat treatment of Wireline groove to provide wear resistance.

SPECIFICATIONS M any energy and lifting sheaves must meet standards. These standards include API, ABS, DIN, DNV and ASM E . De an in s e ifi ations or shea es se in e an in applications also include strength, fatigue, impact and non- destructive testing.

TECHNICAL SUPPORT & TRAINING The selection, use, inspection and maintenance of sheaves requires technical support. This technical support includes engineering services, training support and the ability to meet the various industry requirements around the world.

M cK issick has provided sheaves to energy and lifting industries since the early 190 0 ’s. Since M cK issick became part of Crosby in the mid 190 0 ’s there has been a continuous history of product and process development. Crosby invented the roll forged sheave in 1978 and continues to be a leader today in sheave design and manufacturing process.

Crosby-M cK issick stocks key raw materials and has an e tensi e an o toolin an s fi ient an a t rin capacity to support short deliveries. Crosby has M cK issick block and sheave centers that serve their local markets in Tulsa, Oklahoma (U SA); Putte, Belgium; Singapore; and Hangzhou, China.

M cK issick offers roll forged sheaves that provide an upset etal o itho t reatin a stress one at the s littin

point. The dome-reinforced sheave design provides for a continuous weld in a circular pattern. M cK issick produces shea es in an e ree rofiles an an

ro i e s e ial rofiles as re ire tensi e e erien e underwater and in harsh and demanding environments gives M cK issick the needed experience in selecting sheaves for all applications. From material selection to hardening of the groove, M cK issick sheaves provide the needed wireline life.

Ask: How do they support short deliveries?

Ask: What is their experience providing worldwide delivery?

Ask: What resources do they have in key areas of the world?

Ask: Do they understand and have experience in meeting the industry standards such as API, ABS, DIN, DNV and ASME?Ask: Do they have a history of gaining required approvals? Ask: Are they licensed to manufacture sheaves to API 8C?

Ask: What technical support do they provide? Ask: Where is this support provided from? Ask: What training is available to support the selection, use, inspection and maintenance of sheaves?

Ask: What is their history and experience?Ask: What processes do they have available to draw upon?Ask: What technical experience do they have available to provide technical solutions to technical demands?

Ask: How do they achieve the performance required with a split or cast sheave?Ask: How do they resolve the welding stresses induced when you fabricate the sheave?Ask: What sheave groove profile do they provide on a regular basis? Ask: Do they have technical expertise to recommend proper sheave bearings?Ask: How do they provide for proper Wireline groove life?

THE COMPETITION

THE COMPETITION

THE COMPETITION

THE COMPETITION

THE COMPETITION

Crosby M cK issick has achieved API Q 1, and TS290 0 1 Status, and is licensed to manufacture sheaves to API 8C. Sheaves are frequently provided to API, DNV and ABS requirements.

Crosby has technical and operational support available from each of our M cK issick Block and Sheave Centers around the world. Crosby provides extensive training though our one day Block and Sheave Clinics and our t o a ea i t e inars n str s e ifi trainin is also provided.

The Market Leader: Yesterday Today and Tomorrow

"There is No Equal"

McKISSICK® Wireline GROOVE PROFILES

McKISSICK® STANDARD BEARINGS


McKissick Sheaves

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Copyright © 2016 The Crosby Group LLC Todos los Dereches Reservados

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30˚ 35˚45˚ 30˚ 35˚

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McKissick® Roll-Forged Heavy Duty Sheaves are made by upsetting and forming the groove and flange walls in multiple steps, eliminating the need to split and weaken the groove. This exclusive forging process adds extra strength to the critical groove section.

McKissick Domed Reinforced Extreme Duty Roll Forged Sheaves are welded in a circular pattern thus eliminating the higher stresses created by welding ribs or other forms of stiffeners.

McKissick Heavy Duty Sheaves are available with machined groove rings or machine forged rings utilized for the rim or hub.

McKissick Heavy Duty Closed-Die Forged Sheaves offer the performance of closed-die forging with the precision machining capabilities of CNC machinery.

McKissick Normal Duty Malleable Cast Sheaves provide economical solutions for normal service applications.

McKissick Sheaves come in a variety of sizes to suit your specific applications. Crosby offers many sheaves as standard and these are shown in the pages that follow. For applications that require unique specifications, Crosby can make minor modifications to many of the sheaves listed at a reasonable charge. We can also custom design and manufacture sheaves to your exact requirements. McKissick roll forged sheaves can be furnished balanced or with lightening holes at a reasonable charge on request.

Crosby’s Hardening Technique is a science. It provides a precise maximum hardness for wear-resistance across the wire rope contact area. The McKissick sheave groove is flame hardened to a minimum 35 Rockwell C for a 140° contact area with the wire rope (upon special request the McKissick sheave groove can be flame hardened to a minimum 50 Rockwell C for a 150° contact area with the wire rope). The solid steel plate provides the ideal surface for flame hardening and a closer tolerance fit to the wire rope to reduce fatigue and wear.

The McKissick Hub is stepped to eliminate stress failure in the weld, common in traditional hub designs. The hub is pressed into place with complete metal-to-metal contact. This helps ensure an accurate alignment to the hub’s axis so there is no wobble or lopping of the rotating sheave. The precision aligned hub / sheave wheel combination adds to the bearing life and keeps the sheave on the job longer.

Custom sheaves are available. See page 287 for ordering details.


API STYLE30 degrees

EUROPEAN STYLE45 degrees

AISE STYLE35 degrees

McKISSICK® STANDARD BEARINGS

(W) Roller Bearing with Thrust Washers

(C) Full Complement Cylindrical Roller Bearing

(T) Tapered Roller Bearing

(R) Roller Bearings(B) Bronze Bushing


VALUE ADDED

The Elements of a Superior Sheave.

McKissick® Cold Formed Split Steel

Smooth Radius Edge - Better fit, less wear on rope �

Thicker Fleet Section - Better support, stronger sheave groove �

Deep Penetrating Weld at Hub - Longer life �

Flame Hardened Groove - Higher Rockwell C rating 35Rc 14Rc

Roll Forging Process - Provides superior grain flow �

Roll-Forged Sheave

Every McKissick® Roll-Forged sheave starts as a single piece of AISI C-1035 carbon steel plate. Utilizing a “time proven” proprietary roll forging process that adds extra strength to the critical groove section, the sheave is formed from a precision flame cut blank. The hub is then pressed into place with complete metal-to-metal contact and secured with a deep penetrating weld to ensure proper fit and longer life. Before the McKissick® name is added, each sheave is thoroughly inspected to meet applicable industry and Crosby® quality standards.

McKissick® Roll-Forged sheaves contain the following critical standard features required to meet your demanding applications.

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There is no sheave like a McKissick® Roll-Forged Sheave

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Thicker web on sheave provides required stiffness to support a stronger sheave that contains thicker flange sections

- The thinner web on cold formed split steel sheaves, inherent to the process, does not support thicker flange sections

- The sharp, pointed cutter used in forming the groove during the cold formed split steel process may produce a concealed crack in the bottom of the groove

Size for size, McKissick® Roll-Forged sheaves have a thicker section under the tread of the Wireline groove - providing more substantial support of the Wireline

- Cold formed split steel sheaves are limited to a thinner section thickness under the groove, reducing sheave life in heavy service conditions

- Thinner sections produce a sharp corner under the tread, resulting in potential stress risers

Smooth radius at the rim provides superior transition from outside diameter to groove - eliminating sharp corners that can damage rope

- Cold formed split steel sheaves may contain a sharp transition radius at rim of sheave

DO NOT BE FOOLED

The Elements of a Superior Sheave.

Roll-Forged Sheave

There is no sheave like a McKissick® Roll-Forged Sheave E-mail: [email protected] • (918) 834-4611, Fax: (918) 832-0940

www.thecrosbygroup.com

Crosby® and McKissick® Roll-Forged Sheaves

Reliability You Can Depend On

Cold Formed Split Steel Sheave

Minimum 35Rc for higher hardness in the bottom of the groove - results in less wear to the sheave, thus extending life of Wireline

- Unless requested at time of order, cold formed split steel sheaves have a much lower hardness rating (approx. 14Rc)

- The standard material used in cold formed split steel process may not allow higher hardness in groove

Heavier flange sections - provide a much stronger wire rope groove and maintain proper consistent groove angles, ensuring long term Wireline performance

- Cold formed split steel sheaves tend to have flange sections that are thinner as well as variations in thickness on the same sheave, resulting in less than desired performance during critical applications

- Cold formed split steel sheaves are limited to a maximum flange thickness of 50% of web section

Additional Important Features of McKissick® Roll-Forged Sheaves

The grain flow associated with the McKissick® Roll-Forged sheave process results in excellent performance properties.

Each sheave is permanently marked with “McKissick®”, sheave outside diameter, Wireline size and Product Identification Code (PIC) that provides complete material traceability.

Precision alignment of hub with blank, then finished with a deep penetrating weld - ensuring proper fit, longer life and confidence during the most extreme of applications

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...into thinking all sheaves produce the same results.

Copyright © 2016 The Crosby Group LLC All Rights Reserved

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NOTE: Custom Sheaves are Available.See Page 287 for Ordering Details.

McKissick® Roll-Forged™ Sheaves

Stepped Hub Design Proves BetterThe M cK issick hub is stepped to eliminate stress failure in the weld, common in traditional hub designs. The hub is pressed into place with complete metal-to-metal contact. This helps ensure an accurate alignment to the hub’s axis so there is no wobble or lopping of the rotating sheave. The precision aligned hub/ sheave wheel combination adds to the bearing life and keeps the sheave on the j ob longer.

Full Range of Standard Sheave SizesM cK issick R oll-Forged sheaves are available in a full range of sizes from 12 inches to 78 inches, and bearing styles and prices that best fit o r a li ation Cros also an a t res custom M cK issick sheaves and can make minor

o ifi ations to stan ar shea es as nee e or special applications.

Flame Hardened GrooveCrosby’s hardening technique is a science. It provides a precise maximum hardness for wear-resistance across the wire rope contact area. The M cK issick sheave groove is a e har ene to a ini o ell C for a 14 0 ° contact area with the wire rope (upon special request the M cK issick sheave roo e an e a e har ene to a ini

50 R ockwell C for a 150 ° contact area with the wire rope). The solid steel plate provides the i eal s r a e or a e har enin an a loser toleran e fit to the ire ro e to re e ati e and wear.

Closed Die Upset and Roll Forged – Not Split

U psetting and roll forging forms the groove an an e alls in lti le ste s eli inatin the need to split and weaken the groove. This exclusive forging process adds extra strength to the critical groove section. Y ou can count on a M cK issick sheave to give maximum life performance, because it’s forged to distribute the wire rope forces evenly over an accurately formed load surface. Plus, uniformity of the roll forged groove adds longer wire rope life.

Solid Steel – No Casting E very M cK issick sheave starts as a single piece o soli ar on steel late t s a e t ro closely checked stock, so there’s no inherent

e ri a as o fin in ast shea es There’s better balance and better distribution of forces with a M cK issick R oll-Forged sheave too. Casting can result in groove wall variations – either too thick or too thin – causing uneven stresses and early failure.

Bearing Selection to Match Your Job Requirement

The M cK issick R oll-Forged sheave is available in the ollo in onfi rations

• Plain bore• Bronze bushed• R oller bearing• Tapered roller bearing• Lubrication thru hub• K ey ways• Set screws• Full Complement Bearing

Sheaves are available to API 8C.

HEAVY DUTY SHEAVES FROM 12” THROUGH 78”

Full penetration weld is standard on 40” and larger sheaves.

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McKissick® Domed Reinforced Roll-Forged Sheaves

McKissick® Fabricated Sheaves

DOMED SHEAVES 24” AND LARGER

HEAVY DUTY SHEAVES AVAILABLE THROUGH 116" IN OUTSIDE DIAMETER

Eliminates High Stress Weld Intersections

M cK issick® Domed R oll-Forged sheaves are welded in a circular pattern thus eliminating the higher stresses created by welding ribs or other forms of stiffeners.

Large Range of Sheave Sizes Available

M cK issick Domed reinforced R oll-Forged sheaves are available in sizes 24 inches and lar er an earin st les that est fit o r extreme duty applications.

Roll Forged Sheave and Latest in Welding Technology

M cK issick Domed R oll-Forged sheaves have the strength, fatigue properties and rigidity needed for those “ extreme duty sheaves” with high working stress and side loading.

U .S. Patents D6 21, 24 0

The Best Solution forLarge Sheave Sizes

M cK issick fabricated sheaves are available with machined groove rings or machined forged rings utilized for the rim or hub.

Large Range ofSheave Sizes Available

M cK issick fabricated sheaves are available in multiple sizes, and bearing styles that best fit o r hea t a li ations

For Larger Sheave SizesM cK issick fabricated sheaves are an excellent solution when the required sheave size is too large to be manufactured by the roll forged sheave process.



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McKissick® Ductile Iron Sheaves

HEAVY DUTY SHEAVES FROM 4" THROUGH 12"

NORMAL SERVICE DUTY SHEAVES FROM 3" THROUGH 16"

Closed Die ForgingM cK issick closed die forged sheaves offer the performance of closed die forging with the precision machining capabilities of CNC machinery.

Select Range of Sheave Sizes Available

M cK issick closed die forged sheaves are available in sizes from 4 inches to 12 inches, an earin st les that est fit o r hea duty applications.

Machined Ductile IronM cK issick ductile iron sheaves are manufactured with material that meets ASTM A-53 6 .

Select Range ofSheave Sizes Available

M cK issick ductile iron sheaves are available in sizes from 3 inches to 16 inches, and

earin st les that est fit o r nor al service duty applications.

For Smaller Sheaves in Heavy Duty Application

M cK issick closed die forged sheaves are available in sizes from 4 inches to 12 inches. An extremely effective solution for heavy duty applications where high loads are applied.Any of the bearings we offer with the roll forged sheaves are available.

McKissick® Closed Die Forged Sheaves

For Smaller Sheaves in Heavy Duty Application

M cK issick closed die forged sheaves are available in sizes from 4 inches to 12 inches. An extremely effective solution for heavy duty applications where high loads are applied.Any of the bearings we offer with the roll forged sheaves are available.

For Smaller Sheavesin Normal Duty Applications

M cK issick ductile iron sheaves are an acceptable solution for light or normal duty applications where sheaves are protected by sheave guards and minimal side loads are applied.Standard roller bearings and bronze bushings are typically appropriate for use in these applications.



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API STYLE30 degrees

30˚ 35˚45˚

EUROPEAN STYLE45 degrees

30˚ 35˚45˚

AISE STYLE35 degrees

30˚ 35˚45˚

McKissick® Sheaves Available to API Standards

he shea e rofile is a er i ortant feature of all sheaves. M cK issick manufactures standard sheaves for general use in hoisting wire rope guide applications to minimal API

e ifi ations he rofile in l es a roo e an le o his roo e rofile

is used in mobile cranes, drilling rigs, working units, tubing blocks, traveling blocks, crown blocks and many other general hoisting applications.

D li tin a lian es efines roo e rofiles or ire ro e shea es

Nominal tread depth is 1.5 times wire rope diameter.

M cK issick manufactures sheaves to meet the s e ifi ations o tan ar er

hea es st eet s e ifie riteria established by the Association of Iron and Steel E ngineers for special use in electric overhead traveling cranes for steel mill ser i e he rofile in l es a roo e an le o

Di ensional etails are also i erent ro the P rofile his roo e rofile is se in overhead traveling cranes, mobile cranes, portal cranes, power shovels and other equipment using wire rope.

Contact Crosby for additional available groove angles.

• M cK issick® ro ts has een li ense the eri an Petrole nstit te to an a t re oll or e hea es n er P s e ifi ations C In addition, M cK issick® Pro ts is P ertifie

• M cK issick® Products also produces sheaves to the requirements of API 2C.• API sheaves must meet the criteria established by the American Petroleum Institute for drilling and production hoisting equipment . i al oilfiel a li ations in l e ea a l r in or o er an ell er i in nits in lo s ra elin lo s Cro n lo s

and Offshore Cranes.

API 8C Requires• Databook• M aterial certs and traceability• D/ d ratio per API R P9B• M PI• U T of full penetration weld• 3 0 ° groove angle. G roove depth a minimum

1.3 3 d and maximum 1.75 d, where d= nominal rope diameter.

• M anufactured by an API-8C licensed facility e ifi roo e ra i s

• Can be furnished to API 8C PSL1 or PSL2

API 2C Requires• M aterial certs and traceability• D/ d ratio 18/ 1 or greater, based on pitch diameter• At least 3 0 ° groove angle e ifi roo e ra i s

McKissick® Sheaves Groove Profile Available


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ROLLER BEARINGS Bronze Bushings with “ Figure 8”

oil grooves are made from S.A.E . 6 6 0 ron e or ol finishe sha ts

Bronze Bushing Slow line speed, moderate load and moderate use• M aximum Bearing Pressure (BP): 4 50 0 PSI• M aximum V elocity at Bearing (BV ): 120 0 FPM• M aximum Pressure V elocity Factor (PV ): 550 0 0

Formula for BP = Line Pull x Angle Factor (See Page 3 83 ) Shaft Size x Hub Width (See example)

Roller Bearings are designed to operate on shafts carborized to 6 0 R ockwell C and grounded to + / - .0 0 0 5 of shaft size.

Roller Bearings without inner races are designed to operate on shafts carborized to 6 0 R ockwell C and grounded to + / - .0 0 0 5 of shaft size.

Cylindrical Roller Bearings with snap ring grooves are complete units with outer and inner rings, rib guided cylindrical rollers and sealing rings. They can support axial forces in both directions a well as radial forces. They have high dynamic and static load ratings.

Tapered Bearings are designed to operate on shafts machined to + / - .0 0 0 5 of shaft size. Applications should provide for tightening separator plates against bearing cones to adj ust and insure proper function of bearings.

STANDARD STRAIGHT ROLLER BEARINGS

Heavier loads, higher speeds, more frequent use, radial loads only.

For underwater sheave applications, special bronze bushings are avaiable. Consult the bearing manufacturer for applicable load.

Example: U sing a 14 in. sheave (917191) with a 4 6 0 0 lbs. line pull and an 80 degree angle between lines, determine maximum allowable line speed.

(PV Factor)

550 0 0 BV = = 19 FPM 2896 (BP)

(Shaft Size) (Hub Width)

(Line Pull) (Angle Factor)

BP = 4 6 0 0 lbs. x 1.53 1.50 x 1.6 2

= 2896 PSI

McKissick® Sheaves Bearings Application Information

FULL COMPLEMENT, DOUBLE ROW, ROLLER BEARING Heavy load, high speeds, continuous

operation, axial and radial loads.

TAPERED ROLLER BEARINGS

Heavy loads, high speeds, continuous operation, axial and radial loads.

(R) Roller Bearings (W) Roller Bearingwith Thrust Washers

(B) Bronze Bushing

(C) Full Complement Cylindrical

Roller Bearing(T) Tapered Roller

Bearing

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McKissick® Sheaves o e in a ariet o si es to s it o r s e ifi a li ations Cros o ers an shea es as stan ar an these are sho n in the pages that follow.

or a li ations that re ire ni e s e ifi ations Cros an a e inor o ifi ations to an o the shea es liste at a reasona le har e e an also custom design and manufacture sheaves to your exact requirements. Contact Crosby Sales to order M cK issick® sheaves and include the stock n er an antit or hel in fin in that stan ar shea e or or hel ith s e ial re ire ents or sto esi ne shea es rnish the ollo in important information:

In U SA: Crosby’s Special E ngineered Product G roup at 1-80 0 -777-1555, fax (918) 83 4 -50 3 5, specials@ thecrosbygroup.comIn Canada: Crosby Canada at (90 5) 4 51-926 1In E urope: N.V . Crosby E urope at 3 2 15 757125(26 ).

McKissick® Sheaves Selection Guide

DIMENSIONAL INFORMATION Nominal Outside Diameter:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ WireR ope Size:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ R im Width:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

+ Shaft Size:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ * Hub Width:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Nominal Tread Diameter (Optional):_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Nominal Hub Diameter (Optional): _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ * Hub width is measured over the cone of the Tapered Bearing Sheaves. + Shaft Size is Bore Size on Plain Bore Sheaves.

BEARING TYPE

q Bronze Bushing q + + R oller Bearing q Tapered R oller Bearing q Finish / Plain Bore

q Full Complement Cylindrical R oller Bearing q U nderwater q Other + + R equires hardened and ground shaft

MATERIAL TYPE

q Roll-Forged (Flame hardened 14” and larger) q Forged Steel q Domed

q Cast Steel q Fabricated q Other

APPLICATION INFORMATION Line Pull:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Fleet Angle:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Degree of Wrap:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Line Speed:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ E nvironment:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ G roove Angle: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

SPECIAL REQUIREMENTS Special Testing:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Finish:_______________________________________________ _ _ _ _ _ _ _ _ _ _ _ ___________________________________ ________________

Third Party Inspection / Approval:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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