1、May 2013 Translation by DIN-Sprachendienst.English price group 16No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25
2、.140.10!%$ 13 mmH dimension from the outside edge of the base plate on the blade side, to the near surface of the thickest specified blade of a not inclined base plate; H 25 mmFigure 2 Guide plate dimensionsReciprocating saws shall be equipped with a shoe or backing plate, which supports the recipro
3、cating saw against the work while a cut is being made.DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 104.2.6 Run-down timeCircular saws shall have a run-down time after the stop command has been given of not more than 5 s.4.2.7 Guards4.2.7.1 Circular sawsMeans shall be provided for affixing th
4、e safety guard(s) firmly to the saw.Circular saws shall be provided with a guard above and below the guide plate to prevent unintentional contact of hands with the inserted saw blade. The guard shall be designed to keep the saw blade cutting edge substantially covered at all times, except that porti
5、on of the edge necessary to permit the blade to enter the work. It shall not be possible to remove the guard without the aid of a service tool.123456Key1 auxiliary handle2 guide plate3 movable lower guard4 guard-retracting handle5 fixed guard6 dust shootFigure 3 Circular saw with a movable lower gua
6、rdDIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 11A saw with a movable lower guard, as illustrated in Figure 3, may include a guard-retracting handle. Such a handle shall be designed so that whenever manipulating the handle, the operators fingers need not be in the area where teeth are expose
7、d. The portion of the handle intended to be grasped shall be remote from the teeth or shall be separated from the teeth by a suitable guard, baffle or the like. The guard shall not be liable to jam in any position during normal operation.The guard shall:a) except for panel saws and trim saws:1) have
8、 a distance, a (see Figure 4), from the upper guard to the base plate of less than 38 mm, with the blade set for a cut of maximum depth, and with the plane of the blade 90 from the plane of the base;2) have a blade exposure angle (see Figure 1) of less than 25;a a Distance from the upper guard to th
9、e base plate.Figure 4 Distance from the upper guard to the base plateNOTE The guards of panel saws and trim saws are illustrated in Figure 5.1Key1 stationary guardFigure 5 Panel saw safety guardb) provide protection whenever the saw is at any other setting (i.e. depth and angle of cut) that its adju
10、sting means permits;c) cover the blade teeth at least to the roots of the blade teeth; this requirement shall apply to resharpened as well as to new blades;d) provide protection such that a test probe (see Figure 6) of diameter 13 mm and length 50 mm, cannot touch the blade teeth whenever advanced t
11、oward the blade from the front of the saw, perpendicular to the blade, DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 12parallel to the table and above the table. The saw is to be set for a 90 cut whenever the probe is applied. The probe is to be first centred on the blade and then offset 13 m
12、m to the right and 13 mm to the left of the centre of the blade (see Figures 6 and 7);Dimensions in millimetres5013Figure 6 Test probeaaaa111Key1 test probeaTest probe off-set.Figure 7 Test probe advancement toward the saw bladee) protect the operator from the teeth at the front and above the base;A
13、n opening provided for the ejection of dust in the fixed guard of a circular saw shall conform to at least one of the following. The opening shall be located beyond the outer circumference of the blade, including the teeth. A probe of 13 mm in diameter shall not contact the blade whenever inserted t
14、hrough the opening.DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 13The lower guard shall:a) automatically retract to the closed position whenever the saw is not in use, regardless of the position of the saw or the setting (depth and angle of cut).b) Whenever released from its fully open posit
15、ion, the retractable guard shall move to its fully closed position in a time no greater than 0,3 s. The fully open position is determined with the saw in a normal cutting mode. Verification shall be carried out according to 5.4;c) have no provision for being locked in the opening position;d) be desi
16、gned such that the saw blade can be removed without removing the safety guard from the saw;e) prevent the fitting of a saw blade with a diameter larger than that recommended by the manufacturer of the circular saw.4.2.7.2 Oscillating sawsOscillating saws do not require a guard.4.2.7.3 Reciprocating
17、sawsReciprocating saws do not require a guard for the part of the saw blade which performs the sawing and is situated below the guide plate. The part of the saw blade which is situated above the guide plate shall be protected by a guard or the design shall be such that the risk of contact with the t
18、eeth of the blade and with moving parts of the mechanism is prevented.4.2.8 Power tool constructionThe circular, oscillating or reciprocating saw shall be so designed and constructed as to prevent the loosening or loss of components during expected use, including rough handling and occasional droppi
19、ng, which can compromise its safety functions. Verification shall be carried out in accordance with 5.6.4.2.9 Riving knifeCircular saws intended for cutting wood shall be provided with a riving knife. The riving knife shall not be thicker than the width of the cutting groove nor thinner than the saw
20、 blade body. For more detailed specifications, see IEC 60745-2-5.4.2.10 Blade mounting device Reciprocating sawsThe blade mounting device shall be capable of holding the blade securely during operation and shall have the blade-holding mechanism so constructed as to minimize the likelihood of pinch p
21、oints during intended use of the tool.4.3 Thermal safetySurface temperatures of parts of the circular, oscillating or reciprocating saw, which are held during use or that can be inadvertently touched, shall follow the provisions of ISO 13732-1 and ISO 13732-3.Pneumatic tools shall be so designed to
22、minimize the cooling effects of exhaust air on the handles and other gripping zones.4.4 Noise reductionThe circular, oscillating or reciprocating saw shall be designed and constructed so that the emission of noise is reduced to the lowest level, taking account of technical progress and the availabil
23、ity of means of reducing noise, in particular at source. Principles for designing circular, oscillating and reciprocating saws with reduced noise emission are contained in ISO/TR 11688-1 and ISO/TR 11688-2.DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 14The noise emission from using circular,
24、 oscillating and reciprocating saws has three main sources: the circular, oscillating or reciprocating saw itself; the inserted tool; the workpiece.NOTE Generally the noise emitted due to the characteristics of the workpiece cannot be controlled directly by the manufacturer of the circular, oscillat
25、ing or reciprocating saw.Typical sources of noise emitted by the circular, oscillating or reciprocating saw itself area) the motor and drive mechanism,b) the exhaust air or gases, andc) vibration or impact-induced noise.Where the exhaust air or gases are the major contributor to the noise, means to
26、reduce the noise, for example a silencer or equivalent means, shall be included in the design.Alternatively, where practicable, the exhaust air or gases can be piped away from the operator in a hose.Vibration-induced noise can often be reduced by vibration isolation and damping.This list is not exha
27、ustive; where alternative technical measures for noise reduction, with greater efficiency, are available, they should be used by the manufacturer.4.5 VibrationThe circular, oscillating or reciprocating saw shall be designed and constructed so that the vibration is reduced to the lowest level at the
28、handles and at any other parts of the tool in contact with the operators hands, taking account of technical progress and the availability of means of reducing vibration, in particular at source. Principles for designing circular, oscillating and reciprocating saws with reduced vibration emission are
29、 contained in CR 1030-1.Typical sources of vibration emitted by a circular, oscillating and reciprocating saws are unbalance of rotating parts, poorly designed motors and gears, and resonances in the structure of the machine, particularly the handles and their mounts.The following design features ha
30、ve been found to be effective and should be considered by manufacturers whenever designing circular, oscillating and reciprocating saws:a) autobalancers;b) increasing inertia;c) isolated casing or handles.This list is not exhaustive; where alternative technical measures for vibration reduction, with
31、 greater efficiency, are available, they should be used by the manufacturer.DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 154.6 Materials and substances processed, used or exhausted4.6.1 Exhaust air or gasCircular, oscillating and reciprocating saws driven with compressed air or gas shall be
32、designed in such a way that exhaust air or gases are directed so as not to cause a hazard to the operator and so that any other effects, such as blowing the dust and reflected air or gas from the workpiece on to the operator, are minimized.4.6.2 Dust and fumesSo far as is reasonably practicable, the
33、 circular, oscillating or reciprocating saw shall be designed to facilitate the collection and removal or suppression of airborne dust particles and fumes generated by the work process. The user instructions shall include sufficient information to enable adequate control of the risks from dust and f
34、umes.4.6.3 LubricantsWhere specifying lubricants, the manufacturer shall take environmental and occupational health aspects into account.4.7 Ergonomics4.7.1 Design of the handleGripping areas of the circular, oscillating and reciprocating saws shall be designed to provide convenient, effective means
35、 for the operator to exercise full control over the circular, oscillating or reciprocating saw.Handles and other parts used for gripping the circular, oscillating or reciprocating saw shall be designed to ensure that the operator is able to grip the circular, oscillating or reciprocating saw correct
36、ly and to perform the expected work. Handles shall suit the functional anatomy of the hand and the dimensions of the hands of the operator population.NOTE Further guidance on ergonomic design principles can be found in EN 614-1.Circular, oscillating and reciprocating saws having a mass greater than
37、2 kg (including the inserted tool) shall be capable of being supported by two hands while being lifted or operated.The grip shall be such that normal feed force and reaction torque can be transmitted in an ergonomic way from the hand of the operator to the circular, oscillating or reciprocating saw.
38、The strength of a removable handle and the nature of fixing it shall be appropriate to the intended principal use.4.7.2 Suspension deviceProvision should be made, where appropriate, to enable the attachment to the circular, oscillating or reciprocating saw of a suspension device in order to reduce,
39、where practicable, the physical strain placed on the operator by the weight of the circular, oscillating or reciprocating saw. The fitting of a suspension device shall not introduce an additional hazard.4.8 Controls4.8.1 Start-and-stop deviceCircular, oscillating and reciprocating saws shall be equi
40、pped with a single control device to start or stop them. It shall be adapted to the handle, or to the part of the circular, oscillating or reciprocating saw being gripped, so that it can be held comfortably in the run position, and so that the operator can activate it without releasing the grip on t
41、he handles.DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 16Start-and-stop devices shall be so designed that the inserted tool ceases to be powered when the start-and-stop device is released. Without manual effort and whenever completely released, the device shall move to the stop position, i.
42、e. shall be of the hold-to-run type.Start-and-stop devices shall be in the stop position or immediately move to the stop position whenever the circular, oscillating or reciprocating saw is connected to the energy supply.It shall not be possible to lock the start-and-stop device in the running positi
43、on.4.8.2 Unintentional startThe start-and-stop device shall be so designed, positioned or guarded that the risk of unintentional start is minimized. Verification shall be carried out according to 5.5.Circular and reciprocating saws shall have lock-off start-and-stop devices.4.8.3 Actuating forcesFor
44、 circular, oscillating and reciprocating saws, which are intended to start frequently or are intended to be used for precision work, the actuating force shall be small.For circular, oscillating and reciprocating saws, which are normally used in operations of long duration, the force to keep the star
45、t device in the run position shall be small.NOTE For further information on trigger forces for control devices, see EN 894-3.5 Verification5.1 General conditions for testsTests according to this part of ISO 11148 are type tests.5.2 NoiseThe noise emission values shall be measured and declared in acc
46、ordance with ISO 15744.Compliance with 4.4 may be verified through the comparison of the noise-emission values with those for other machines of the same family, or with machines of similar size and performance characteristics.5.3 VibrationFor reciprocating, oscillating and small circular saws, the v
47、ibration total value shall be measured and reported in accordance with ISO 28927-8. For circular saws intended for cutting wood, the vibration total value shall be measured and reported in accordance with ISO 20643.The vibration emission value, and its uncertainty, shall be declared in accordance wi
48、th EN 12096.NOTE Useful information about operating conditions during vibration tests on circular saws intended for cutting wood can be found in IEC 60745-2-5.Compliance with 4.5 may be verified through the comparison of the vibration-emission values with those for other machines of the same family,
49、 or machines of similar size and performance characteristics.DIN EN ISO 11148-12:2013-05 EN ISO 11148-12:2012 (E) 175.4 Circular saw retractable lower guardCompliance with 4.2.7.1 f) shall be verified by subjecting a single sample to each of the following tests. Closure time shall be measured without restoration of the guard in case of bending.a) Saw 25 cuts 2,4 m (8 ft.) long of 13 mm (1/2 inch) thick fir plywood, which has been stored indoors for 72 h prior to being sawed. Then, condition the saw for 24 h in air at a relative humidity of 90+50%, and a tempera
