Renfroe DWS Manuale utente

WARNING:

Before putting tool in service,

take to your immediate

supervisor.

Application, Operation and Maintenance Manual

Model DWS

OM 211-DWS

RENFROE

This Operator’s Manual covers the Application, Operation and

Maintenance of this RENFROE product. Operator’s Manuals for

other current RENFROE products are available upon request. Di-

rect Requests to J.C. Renfroe & Sons, Inc., Jacksonville, Florida

32201.

Operators

Manual

J.C. RENFROE & SONS,

INCORPORATED

of Jacksonville, Florida, has

been an international leader in

the manufacture and marketing

of Lifting Clamps for over fifty

years. RENFROE products are

manufactured in Jacksonville,

Florida. A worldwide network

of stocking distributors pro-

vides a readily available source

of supply and service.

J.C. RENFROE & SONS, IN-

CORPORATED

Jacksonville, Florida 32201

Telephone: 904/356-4181

Toll Free: 1-800-874-8454

Fax: 904/354-7865

www.jcrenfroe.com

THIS PUBLICATION SUPERSEDES ALL PREVIOUSLY

PUBLISHED AND/OR DISTRIBUTED INFORMATION

BY MANUFACTURER AND/OR ITS DISTRIBUTORS

WITH RESPECT TO APPLICABLE RENFROE

PRODUCTS AND SUBJECT MATTER DESCRIBED OR

CONTAINED HEREIN.

NOTICE OF EXCLUSION OF WARRANTY

RENFROE HAS HEREIN SET FORTH IN

CONSPICUOUS LANGUAGE AN EXCLUSION OF

ANY WARRANTY EITHER EXPRESSED OR

IMPLIED, WHICH IS NOT SPECIFICALLY AND

PARTICULARLY CONTAINED HEREIN. PLEASE

REFER TO THAT STATEMENT FOR

REPRESENTATIONS AND WARRANTIES OF

PRODUCTS MANUFACTURED BY J.C. RENFROE &

SONS, INC.

WARNING:

Prior to selection, operation and/or maintenance of

RENFROE products, read and understand the information

provided in this manual.

The understanding and use of the Definitions are im-

portant in determining the limitations and proper application

of RENFROE products.

Failure to review and utilize recommended applica-

tions, operation and maintenance instructions may result in

serious injury to operator and others.

OPERATING AIDS

(DO’S AND DON’TS)

1. DO read and understand the Operators Manual before using the clamp

2. DO Consult Operator’s Manual or RENFROE when in doubt.

3. DON’T Lift over workmen DON’T lift over Safety Areas or personnel.

4. Do attend a factory training class for establishing proper use of Renfroe

Products.

5. DO Lock clamp closed before lifting load. DON’T lift with lock in open or

“Lock Open” position.

6. DON’T Use a connection that may release the clamp.

7. DON’T attach clamp directly to crane hook. DO use a flexible connection

between crane and clamp shackle. DON’T use heavy flexible connection.

8. DO use correct clamp for job. DON’T use large capacity clamps to lift light

loads.

9. DO Use an adequate number of clamps to balance load. DON’T lift loads

that are not balanced.

10. DO Use clamps within their rated capacity. DON’T overload clamps

11. DO Inspect clamp before each lift, follow inspection and maintenance in-

structions outlined in this manual and use RENFROE replacement parts to

assure proper operation of the clamp

12. DON’T Use clamp that has been overloaded. DO refer to pre-lift inspection

in Operators Manual

13. DON’T Side load with a straight shackle clamp. DON’T lift from side with

vertical clamp

14. DON’T Misuse. DON’T lift plate from bottom of plate stack.

15. DON’T Rush. DON’T lift more than one plate at a time with a vertical clamp.

16. DON’T Improvise. Always use correct clamp for job. DON’T lift plate hori-

zontally with a vertical lift only clamp.

17. DON’T Alter clamp. DON’T grind, weld or modify the clamp in any manner.

DEFINITIONS

VERTICAL LIFT: The lifting of a sin-

gle plate or member in which the lifting

force exerted by the rigging is directly

above and in line with the lifting shackle

as shown in the illustration below.

VERTICAL TURN/LIFT: A vertical

turn/lift clamp is a vertical lifting clamp

specifically intended to turn a single

plate or member thru a ninety degree

(90°) arc and back to vertical thru the

same ninety degree (90°) arc or from

horizontal to vertical to horizontal thru a

one hundred and eighty degree (180°)

arc. Refer to Application Section of

specific Turn/Lift clamps for further

detail. During the turning operation the

edge of the plate opposite the edge to

which the clamp is attached should al-

ways be in contact with a supporting

surface such as a factory floor and the

load on the clamp not exceed one half

rated capacity of clamp—refer to illus-

trations shown below.

HORIZONTAL LIFT: Clamps (used

in pairs or multiples) are attached to the

side edges of a plate or bundle of plates

positioned horizontally to the floor

level. The rigging attached to clamps is

generally multi-legged slings with the

connecting point of the slings being

approximately centered between the

distance separating the clamps. Refer

to illustrations shown below. WARN-

ING: The capacity of all horizontal

clamps is based on a sling angle of

sixty degrees (60°). See illustration

below. Sling angles less than sixty

degrees (60°) increase the load ex-

erted on the clamps, Never exceed

the rated capacity of a single clamp.

STEEL PLATES: Unless otherwise

specified, lifting clamps are manufac-

tured to handle hot-rolled steel plates

whose Brinell Hardness does not ex-

ceed 300. WARNING: Do not lift

plates with coatings or mill scale that

prevent the gripping surfaces of the

clamp from making positive contact

with the base metal.

For applications not covered by the

above information, secure written rec-

ommendations from RENFROE.

FINISHED AND POLISHED

PLATES: Steel plates in this category

have other than hot-rolled surfaces such

as stainless steel, etc., are generally

handled using non-marring clamps in-

corporating smooth gripping surfaces.

WARNING: For applications using

clamps with serrated gripping sur-

faces on finished or polished plates,

secure written recommendations

from RENFROE.

STRUCTURAL MEMBERS—

FABRICATED SECTIONS: Unless

otherwise specified, clamps described

as capable of handling structural mem-

bers and fabricated sections are limited

to hot-rolled steel whose Brinell Hard-

ness does not exceed 300. WARN-

ING: For applications not covered

by the above information, secure

written recommendations from

RENFROE.

RATED CAPACITY: The rated capac-

ity of a RENFROE product is based on

the product being in “new or as new”

condition and represents the maximum

load the product is to be subjected to

when utilized in the manner described

in this manual. Wear, misuse, abuse

and other factors relating to usage may

reduce the rated capacity. Shock load-

ing and the factors listed must be taken

into consideration when selecting a

RENFROE product for a given applica-

tion.

PLATE THICKNESS: The minimum

and maximum plate thickness a clamp

specified for handling plates is capable

of lifting. WARNING: Never use a

clamp for lifting a plate where the

plate thickness is less than or greater

than the minimum and maximum

stenciled on the clamp.

JAW OPENING: The minimum and

maximum thickness of a member of

clamp specified as having a JAW

OPENING is capable of handling.

WARNING: Never use a clamp on a

member whose thickness is less than

or greater than the range of jaw

opening stenciled on the clamp.

OPERATING TEMPERATURES:

Unless specified under the Application

Section of the individual model, the

approved operating temperature of

RENFROE clamps is from zero degrees

Fahrenheit (-18 Celsius) to a maximum

of 200 degrees Fahrenheit (+93 degrees

Celsius). The minimum and maximum

temperatures apply to both ambient and

the material being handled by the

clamp. WARNING: Secure written

authorization from RENFROE be-

fore using clamps in temperatures

other than shown.

“HOT LIFTS”: The Model R and S

clamps are available in modifications

that are capable of making lifts where

the temperatures of the member being

lifted exceeds 200 degrees Fahrenheit

(+93 degrees Celsius). Depending on

conditions a lift may exceed 1000 de-

grees Fahrenheit (538 degrees Celsius).

The exact application and temperatures

of the plates to be handled are critical in

selecting the proper model. WARN-

ING: Secure written instructions

from RENFROE for all hot lift appli-

cations.

LOCKING CLAMPS: Locking clamps

are divided into the categories listed

below. With the exception of the

“Locking Wedge” and “Locking

Screw” type the purpose of the locks

are to facilitate the attaching and re-

moving of the clamp from the member

being handled.

“LOCK CLOSED” - an overcenter

spring loaded mechanism in which the

spring exerts a force on the gripping

cam when the lock handle is moved to

the “Lock Closed” position. When the

handle is moved to unlocked position

the force exerted by the spring is re-

laxed and the gripping cam may be

retracted by pushing the lifting shackle

into body of clamp. Refer to the Opera-

tion Section of specific models of

“Lock Closed” clamps for additional

details. Typical “Lock Closed” clamps

are Models DG, FR and M.

“LOCK OPEN ONLY” - normally used

on “Hot Lift” clamps and consists of a

manually operated “Lock Stop Pin” that

is inserted when gripping cam of clamp

is retracted and removed when clamp is

positioned on the plate. Tag line may

be used to permit operator to remove

pin from a greater distance from clamp.

Refer to the Operation Section of spe-

cific model of “Lock Open Only”

clamps for additional details. Typical

“Lock Open Only” clamp is the Model

RO.

“LOCK OPEN-LOCK CLOSED” - an

over-center spring loaded mechanism in

which the spring exerts a force on the

gripping cam when the lock handle is

moved to the “Lock Closed” position.

When the handle is moved to the “Lock

Open” the gripping cam is maintained

in the retracted position for ease in in-

stalling the clamp on a plate or mem-

ber. The Model FRD contains individ-

ual “Lock Open” and “Lock Closed”

mechanisms that must be operated

separately. Refer to the Operation Sec-

tion of specific models of the “Lock

Open-Lock Closed” clamps for addi-

tional details. Typical “Lock Open-

Lock Closed” clamps are Models FRD,

R, S, SD, SEA, SX, TL, TLA and the J-

Series.

“LOCKING WEDGE” - is a fluted

steel wedge that is driven in place with

hammer. The body of the wedge is

positioned in a slot in the clamp body

with the fluted edges contacting the

member to which the clamp is being

attached. Refer to Operation Section

of specific models of the “Locking

Wedge” clamps for additional details.

Typical “Locking Wedge” clamps are

Model A1, B1, B2 and PB.

”LOCKING SCREW” - “Lock Screw”

clamps depend on manually adjusting a

screw to hold the gripping surface in

place for lifting and removing the

clamp from member being lifted. Refer

to Operation Section of a specific

model of “Locking Screw” clamps for

additional details. Typical “Locking

Screw” clamps are Models AC, ACP,

NM, PC, SCP and SCPA.

NON-LOCKING: “Non-Locking”

clamps have no mechanisms to aid in

attaching or removing clamp from

member being lifted. It is necessary to

have position of clamp maintained on

the member being lifted until a properly

applied force is exerted to the lifting

shackle. Refer to Operation Section of

specific models of the “Non-Locking”

clamps for additional details. Typical

“Non-Locking” clamps are Model AST,

ASTL, BD, HR, HDR and WHSR.

WARNING: A pointing out and no-

tice of danger. The purpose of a

“WARNING” is to apprise the operator

and all other affected persons of the

existence of danger of which he should

be but may not be aware and to enable

the operator to protect himself and oth-

ers where applicable against such dan-

ger. An attempt is made herein to warn

against reasonable and reasonably fore-

seeable danger in the proper use and

possible reasonable misuse of

RENFROE products described in this

manual.

DESIGNATED PERSON — A person

selected by the employer or the employer’s

representative as being competent to per-

form those specific duties.

QUALIFIED PERSON — A person who,

by possession of a recognized degree in an

applicable field or certificate of profes-

sional standing, or who, by extensive

knowledge, training, and experience, has

successfully demonstrated the ability to

solve problems relating to the subject mat-

ter at hand.

MODEL DWS

HORIZONTAL LIFTING

LOCKING CLAMP

APPLICATION

The Model DWS is a horizontal lifting clamp intended to be used in

pairs, sets of pairs, or in a tripod arrangement for transporting plate

horizontally. Refer to Illustrations A, B and C. The Model DWS in-

corporates a “Lock Closed” feature which facilitates attaching the

clamp to the member being lifted and make it an ideal horizontal lock-

ing plate clamp. Refer to definition pages for explanation of “Lock

Closed” clamp.

For identification of component parts, refer to the exploded view of the

clamp located at the end of the Maintenance Section.

Indice

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