IEC TR 62112:2001

Safety of hand-held motor-operated electric tools - Particular requirements for drills - Test procedure concerning dynamic forces at sudden stalling

This technical report deals with test specifications for the dynamic behaviour of drills and impact drills after sudden stalling of the rotating drillbit.

General Information

• Status: Withdrawn
• Publication Date: 15-Oct-2001
• Withdrawal Date: 14-Sep-2005
• ICS: 25.080.40 - Drilling machines
• ICS: 25.140.20 - Electric tools
• Technical Committee: TC 116 - Safety of motor-operated electric tools
• Current Stage: WPUB - Publication withdrawn
• Completion Date: 15-Sep-2005

Standards Content (Sample)

TECHNICAL IEC
REPORT
TR 62112
First edition
2001-10
Safety of hand-held motor-operated electric tools –
Particular requirements for drills –
Test procedure concerning dynamic forces
at sudden stalling
Sécurité des outils électroportatifs à moteur –
Règles particulières pour les perceuses –
Procédure d'essai des forces dynamiques
lors d'un calage soudain
Reference number
IEC/TR 62112:2001(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

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TECHNICAL IEC
REPORT
TR 62112
First edition
2001-10
Safety of hand-held motor-operated electric tools –
Particular requirements for drills –
Test procedure concerning dynamic forces
at sudden stalling
Sécurité des outils électroportatifs à moteur –
Règles particulières pour les perceuses –
Procédure d'essai des forces dynamiques
lors d'un calage soudain
 IEC 2001  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
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International Electrotechnical Commission
For price, see current catalogue

– 2 – TR 62112  IEC:2001(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
SAFETY OF HAND-HELD MOTOR-OPERATED ELECTRIC TOOLS –

PARTICULAR REQUIREMENTS FOR DRILLS –

TEST PROCEDURE CONCERNING DYNAMIC FORCES

AT SUDDEN STALLING
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this technical report may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62112, which is a technical report, has been prepared by subcommittee 61F: Safety of
hand-held motor-operated electric tools, of IEC technical committee 61: Safety of household
and similar electrical appliances.

The text of this technical report is based on the following documents:
Enquiry draft Report on voting
61F/282/CDV 61F/342/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
This document, which is purely informative, is not to be regarded as an International
Standard.
TR 62112  IEC:2001(E) – 3 –
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or

• amended.
– 4 – TR 62112  IEC:2001(E)
INTRODUCTION
In IEC 60745-2-1, Safety of hand-held motor-operated electric tools – Part 2: Particular

requirements for drills, the allowed degree of static stalling torque of a clutch at the locked

driven spindle is given in clause 18.101 for different shaped tools. Because of a lack of

knowledge about dynamic behaviour at sudden stalling, it was not possible there to define any

limits or a test procedure.
A working group was therefore instituted to determine requirements and test specifications

concerning dynamic forces in clutches, and a round-robin-test was initiated.

The work proceeded in three steps:
1. design of a test rig and installation of measuring devices: the influence of an operator on
the torque at the handles was evaluated;
2. measurement of maximum torque that can be held at the handles at sudden stalling;
3. design of a loading device that simulates the hand-arm-system and of a test rig.
This technical report defines test procedures and limits for dynamic forces interfering in a
sudden stalling. It presents a type-test concerning normal and correct use. It does not exclude
the possibility that incorrect operation may lead to injuries when clutches are designed
according to this proposal.
TR 62112  IEC:2001(E) – 5 –
SAFETY OF HAND-HELD MOTOR-OPERATED ELECTRIC TOOLS –

PARTICULAR REQUIREMENTS FOR DRILLS –

TEST PROCEDURE CONCERNING DYNAMIC FORCES

AT SUDDEN STALLING
1 Scope
This technical report deals with test specifications for the dynamic behaviour of drills and
impact drills after sudden stalling of the rotating drillbit.
2 Definitions
2.1
stalling
sudden stoppage of the drillbit
2.2
stalling device
device (e.g. brake) which would cause the drillbit to stop suddenly
3 Test rig
The machine is positioned vertically down in a test rig, rotatable around its drill-spindle (see
figures 1 and 2). The lower bearing is designed as a stalling device for the "drill". The stalling
device (e.g. a brake) has to jam the drillbit within an
...