EP3192615A1 - Insulated tool and/or measuring device - Google Patents

Abstract

The invention relates to an electrically insulated tool and / or measuring device with a housing (16) which has a handle (18). The housing (16) and the handle (18) of the electrically isolated tool and / or measuring device are surrounded by an electrical insulation (14). The electrically isolated tool and / or measuring device has a change system (12) for receiving plug-in modules or plug-in modules (30).

Description

Technical area

1. a) einem Gehäuse mit einem Griff und
2. b) einer elektrischen Isolierung, welche das Gehäuse und den Griff umgibt und
3. c) einem Wechselsystem zur Aufnahme von Einsteck- oder Aufsteckmodulen.

The invention relates to an electrically insulated tool and / or measuring device

1. a) a housing with a handle and
2. b) an electrical insulation surrounding the housing and the handle and
3. c) a change system for receiving plug-in modules or plug-in modules.

description

Pliers, screwdrivers, testers and the like are used in numerous electrically sensitive applications. Such tools or measuring devices are used, for example, in electrical devices, electrical machines or in the construction or repair of electrical lines. For insulation against electrical voltages, the tools have an insulating layer. The insulation layer is often made of ceramic or plastic, depending on the application. The insulating layer naturally has a poor electrical conductivity in each case. For measuring devices, such as voltmeters, an insulation layer is provided on the parts that come into contact with the user.

In many applications, the parts are immersed for isolation in a plastic bath with liquid plastic. After a curing phase, the plastic nestles around the part, as far as it was previously immersed in the plastic bath.

State of the art

From the DE 783 64 83 U1 is a tool known as socket wrenches or screwdrivers. The tool consists of a shaft and a transversely extending handle. The handle and most of the shaft are covered by an electrically insulating housing. The insulating housing of the tool consists of at least two parts, which are connected to each other by means of welding or the like.

In the DE 790 03 812 U1 is a tool, such as socket wrench or screwdriver with torque limiting described. The tool has a shaft and a handle. An electrically insulating housing envelops the handle and most of the shaft. The insulating housing of the tool consists of at least two parts welded together.

The DE 1 991 993 U1 discloses a torque wrench for mounting electrical clamps. The torque wrench is surrounded by a housing made of insulating material. From the housing protrudes a polygon, which is intended for tightening Allen screws with a certain torque. On the housing, a handle made of glass fiber reinforced resin with screws is also attached.

The known tools or measuring devices, such as torque wrenches, have the disadvantage that users can receive a shock when changing the plug-in or plug-in modules. Although the housing of the currently used devices have an insulation, which, however, does not affect all components of the tool or Measuring device extends. Here is a significant potential for the user to accidentally get an electric shock.

Disclosure of the invention

The object of the invention is therefore to avoid the disadvantages of the prior and to provide a tool or measuring device in which the user receives no electric shock when changing the input or plug-in module.

• d) das Wechselsystem eine elektrische Isolierung aufweist.

According to the invention the object is achieved in that in an electrically insulated tool and / or measuring device of the type mentioned

• d) the exchange system has an electrical insulation.

In the known tools or measuring devices, which have a removable system for replacing plug-in or plug-in modules, the housing or the handle is insulated against electrical voltages at best. Incorrect operation and accidental touching of the changer system often resulted in electrical shocks to the user. Especially in the high voltage range, where such tools or measuring devices are also used, this can be life-threatening for the user. The invention is based on the recognition that not only the handle or the housing must be electrically insulated, but also the exchange system of the tool or measuring device must have an insulation. The change system must be designed in such a way that the replacement works perfectly without loss of insulation.

In an advantageous embodiment of the electrical insulated tool and / or measuring device according to the invention, the plug-in modules or plug-on modules have electrical insulation. Since an isolated change system alone is often not sufficient to the tool or meter sufficiently well against electrical voltages isolate, has proven to be advantageous if the respective plug-in or plug-in module according to an insulation has, The isolation of the plug-in or plug-in modules prevents an additional source of danger to come into contact with the electrical voltage.

In the case of tools or measuring instruments, it may happen that the insulation must be removed in order, for example, to carry out a calibration. Insulations made by immersing the housing or handle in a liquid plastic which eventually hardens must be removed by cutting. It is therefore associated with considerable effort to reach the interior of the housing. After removal of the insulation, this must be applied again with considerable effort. It has therefore been shown in an advantageous embodiment of the electrically insulated tool and / or measuring device according to the invention that the electrical insulation consists of two half-shells, which are composed. These shells can be easily disassembled, so as to make an adjustment or calibration, for example. Preferably, in a particular variant of the invention, the half shells are assembled with spring and groove. The connection of spring and groove can be welded together either for example with ultrasound or suitable heat sources.

A particularly advantageous embodiment of the electrically isolated tool and / or measuring device according to the invention is achieved in that the tool and / or measuring device is designed as a torque wrench or torque screwdriver. Even in the high voltage range, tighten screw connections with a defined torque in order not to destroy the threads. For this purpose, torque wrenches or torque screwdrivers are the appropriate means. In order to minimize the risk of an electric shock for the user to minimize the torque wrench or torque screwdriver according to the invention if possible completely isolated. This includes especially the exchange system for the plug-in or plug-on modules.

A preferred variant of the electrically isolated tool and / or measuring device according to the invention therefore additionally consists in that the changing system for receiving plug-in modules or plug-on modules has an electrically insulated mechanism for releasing the plug-in modules or plug-on modules. In this way, the plug-in or plug-in module can be easily solved by the exchange system. For example, a locking mechanism may be provided which is released by an actuating button or operating lever, so that the plug-in or plug-on module can be released.

Sharp edges and wear due to frequent use may damage the tool or meter insulation. This can put a user in the greatest danger of receiving an electric shock. An advantageous embodiment of the electrically isolated tool and / or measuring device according to the invention consists in the fact that the electrical insulation has a glass fiber reinforcement. This stabilizes the insulation. This stabilization can be incorporated, for example, as a fabric in the insulation. Glass fibers are considerably harder than plastic, which often produces insulation.

As an alternative to the glass fiber reinforcement can be used according to the invention for electrical insulation Polyphthalamide. Polyphthalamide materials are characterized by high cut resistance. Polyphthalamides are also known, for example, under the trade names Amodel, Grivory, Ultramid T, Akromid T, VESTAMID HTplus and Zytel HTN.

A preferred embodiment of the electrically isolated tool and / or measuring device according to the invention also results from the fact that an electrically isolated switching is provided for a right and left suit. As a result, in the case of a ratchet tool or a torque wrench, for example, with one device two directions of rotation can be determined. By simply switching the direction of rotation can be determined for a suit.

A preferred embodiment of the electrically insulated tool and / or measuring device results from the fact that the components of the exchange system consist of non-conductive material or provided coated with an insulation. This measure serves to increase the degree of isolation of the exchange system. This is to ensure that there are no electric flashovers on the change system.

Further embodiments and advantages will become apparent from the subject of the dependent claims and the drawings with the accompanying descriptions. An embodiment is explained below with reference to the accompanying drawings. The invention should not be limited solely to these listed embodiments. They are only intended to illustrate the invention. The invention is intended to refer to all objects which now and in the future the skilled person would take as obvious for the realization of the invention.

Short description of the drawing

Fig. 1

shows in a schematic diagram of an embodiment of an insulated torque wrench according to the invention, which has a changing system with electrical insulation.

Fig. 2

shows in a schematic diagram according to the isolated torque wrench Fig. 1 with the changer system removed.

Fig. 3

shows in a section a change system with electrical insulation.

Fig. 4

shows in a section the merger of a two-part insulation for a torque wrench according to the invention.

Fig. 5

shows in a section the welded combination of a two-part insulation for a torque wrench according to the invention.

Fig. 6

shows the front side of the two-part insulation of the receiving side for the change system of a torque wrench according to the invention.

Fig. 7

shows a perspective view of a two-part insulation for a torque wrench according to the invention.

Fig. 8

shows in a detail of a perspective view of the merger of a two-part insulation for a torque wrench according to the invention.

Preferred embodiment

In Fig. 1 an embodiment of an isolated torque wrench 10 according to the invention is shown in a schematic diagram, which has a change system 12 with electrical insulation 14. The insulation is a poorly conductive plastic, which is crossed for reinforcement and cut resistance with a glass fiber fabric. Instead of the glass fiber reinforcement, polyphthalamides can also be used for the insulation.

The torque wrench 10 has a housing 16 on which a grip part 18, a lever 20 and a receiving end 22 are formed. The receiving end 22 is tapered and provided with a latching mechanism 24. The change system 12 has a receiving sleeve 26. The tapered receiving end 22 is inserted into the receiving sleeve 26 and releasably engaged in the latching mechanism 24 a. The change system 12 and the torque wrench 10 are thus firmly connected.

The change system 12 further includes a slip-on mechanism 28 for a slip-on module 30. The change system 12 is designed as a ratchet 32 in the present embodiment. Alternatively, the change system 12 can alternatively be designed, for example, as an open-end or open-end wrench. On the front side of the ratchet 32, a drive square 36 is provided, on which, for example, a Aufsteckmodul 30 trained Aufsteckschlüssel 34 or a drive part is pushed with a corresponding inner square. The drive square 36 is formed as an external square. To anchor the socket wrench 34 locks a latching mechanism 66 (see Fig. 3 ) of the drive square 36 in the inner square of the socket key 34 a. The latching mechanism 66 is released with an actuating button 38. By pressing the operating knob 38, the latching mechanism 66 releases, so that the Aufsteckschlüssel 34 can be removed.

The ratchet 32 is configured to lock in one direction of rotation. With a shift lever 40, which is provided in the present embodiment of the exchange system, the direction of rotation of the ratchet can be changed.

Subsequently, a display 42 is provided in the housing 16 on the grip part 18. The display 42 indicates the respective torque which is applied to the torque wrench 10. The display is protected by an insulating disk 43 which is incorporated in the insulation 14. In the present embodiment is an analog representation. In other variants, a digital representation may also be provided.

The applied torque is transmitted from the ratchet 32 via a lever system with a flexure in the housing 16. About the flexure each current torque is detected. At a certain target torque of the torque wrench 10 triggers in the case of a triggering torque wrench 10, ie it signals the user when a set torque has been reached. The housing 16 of the torque wrench 10 is completely surrounded by the insulation 14. The insulation 14 consists of two insulating half-shells 44, 46, as it is for example in Fig. 2 is shown. The change system 12 also has an insulation 48. Also, the actuator button 38 and the lever 40 for the ratchet 32 are made of a non-conductive material. The insulation 48 also extends to the drive square 36. To prevent electrical shock, the Aufsteckschlüssel 34 is either made of a non-conductive material itself or has a corresponding insulation 48. The insulation 48 of the exchange system 12 also consists of two half-shells 50, 52nd

At the end of the handle portion 18, a thumbwheel 54 is provided. With the setting wheel 54, the target torques at which the torque wrench 10 is to trigger, can be adjusted. The adjusting wheel 54 is provided detachably. As a result, the torque wrench 10 can be readjusted if necessary.

Fig. 2 shows in a schematic diagram of the insulated torque wrench 10 according to Fig. 1 in which the changing system 12 is removed. As far as these two figures correspond, the same reference numerals are used. In this presentation of Fig. 2 In particular, the tapered receiving end 22 and the latching mechanism 24 will be visible. The insulating shells 44, 46 of the torque wrench 10 are each at their contact points via a spring and groove connection, as well as in the FIGS. 4 to 7 recognizable, interconnected. The two insulating half-shells 44, 46 completely surround the housing 16 so that a user does not receive an electric shock. The tapered receiving end 22 includes a stop 56 to which the changing system 12 can be performed with its receiving sleeve 26.

Figure 3 shows in an enlarged section the change system 12 with electrical insulation 48. The change system 12 is designed as a ratchet 32. The ratchet 32 is formed by a gear 58 and a pawl 60. An actuating pin 62 extends from the shift lever 40 to the pawl 60. As a result, the pawl 60 can be actuated via the actuating pin 62 with the shift lever 40. Depending on the position of Pawl 60, the possible rotation and locking direction can be set. The pawl 60 is biased by a spring element 63.

The gear 58 is connected to the drive square 36. In the drive square 36, a substantially central and vertical bore 64 is provided. The latching mechanism 66 consists of a spring-loaded punch 68 with a pin 70 which projects into the vertical bore 64 of the drive square 36. In the drive square 36, a transverse bore 72 is provided through which a detent ball 74 protrudes only partially outward. The detent ball 74 locks the plug-in module 30 by cooperation with a transverse groove of the inner square of the plug-on module. The punch 68 is pressed to release the latching mechanism 66 against the spring force of a coil spring 76 with the non-conductive knob 38. In this case, the detent ball 74 can escape into a recess 78 of the pin 70 for releasing the plug-on module 30. The plug-on module 30 is pushed away with the pin 70 from the locked position and can be removed from the drive square 36.

In the receiving sleeve 26 designed as a projection connecting plug element 80 is provided. The connecting plug element 80 has a spring-loaded latching pin 82. The changeover system 12 is pushed for attachment to the housing of the torque wrench 10 with the receiving sleeve 26 via the tapered receiving end 22 to the stop 56. In this case, the connecting plug element 80 protrudes into a corresponding opposite opening 96 (see Fig. 6 ) of the housing 16 at the receiving end 22. The spring-loaded detent pin 82 engages in the opening 96 a. As a result, the change system 12 is fixed to the housing 16 of the torque wrench 10.

The change system 12 is completely surrounded by the insulation 48. Operating elements, such as the operating knob 38 or the lever 40, consist of a non-conductive material. The insulation 48 consists of the two half-shells 50, 52, which are joined together with the spring and groove connection. It is intended that the Aufsteckmodule 30 also have sufficient insulation against electrical voltages.

Fig. 4 shows in a section a small section of the union of the two-part insulation 14, 48 for the torque wrench 10. As far as this representation corresponds to the previous figures, the same reference numerals are used. The edge 84 of each half shell 44 and 50 has a groove 86, while the edge 88 of the respective other half shell 46 and 52 has a spring 90.

Fig. 5 shows in a section a small section of the welded combination of the two-part insulation 14, 48 for the torque wrench 10. If components of the previous figures are used, the corresponding reference numerals are also adopted. The spring 90 is pressed into the groove 86. With a welding agent 92, this compound 94 is held together. The connection 94 is electrically insulating, so that no electrical voltages can overturn. If necessary, the connection can also be welded with ultrasound. In pulsed ultrasonic welding, one or more thermoplastic materials are bonded together by internal friction in the joining zone. Ultrasonic welding is particularly suitable for thermoplastics.

Figure 6 shows the two-piece insulation 14 from an end face of the receiving end 22 for the torque wrench 10. As far as this representation corresponds to the previous figures, the same reference numerals are used. The tapered receiving end 22 of the insulated housing 16 terminates in the stop 56. The opening 96 is seated centrally on the end face of the receiving end 22. In this opening 96 serves to receive the male connector element 80. The receiving sleeve 26 of the exchange system 12 slides over for attaching the parts the receiving end 22.

Fig. 7 shows in a perspective view of the two-piece insulation 14 for the torque wrench 10. As far as this representation corresponds to the previous figures, the same reference numerals are used. The insulating half-shells 44, 46 each have at their edges 84, 88 grooves 86 and springs 90. By compressing the tongue and groove connection 86, 90, the half-shells 44,46 can be joined together. Between the half-shells 44, 46 can easily accommodate the housing 16 of the torque wrench 10. The tongue and groove joint 86, 90 is ultrasonically welded during manufacture.

10

Drehmomentschlüssel

12

Wechselsystem

14

Isolierung

16

Gehäuse

18

Griffteil

20

Hebel

22

Aufnahmeende

24

Rastmechanismus

26

Aufnahmehülse

28

Aufsteckmechanismus

30

Aufsteckmodule

32

Ratsche

34

Aufsteckschlüssel

36

Antriebsvierkant

38

Betätigungsknopf

40

Schalthebel

42

Anzeige

43

Isolierende Scheibe

44, 46

Isolierende Halbschalen des Drehmomentschlüssels

48

Isolierung des Wechselsystems

50, 52

Isolierende Halbschalen des Wechselsystems

54

Stellrad

56

Anschlag

58

Zahnrad

60

Sperrklinke

62

Betätigungszapfen

63

Federelement

64

vertikale Bohrung

66

Rastmechanismus

68

Stempel

70

Stift

72

Querbohrung

74

Rastkugel

76

Spiralfeder

78

Ausnehmung

80

Verbindungssteckelement

82

Raststift

84

Rand

86

Nut

88

Rand

90

Feder

92

Schweißmittel

94

Verbindung

96

Öffnung

Figure 8 shows in a section of a perspective view of the merger of the two-part insulation 14 and 48 for a torque wrench 10. If the representation with the previous figures matches, the same reference numerals are used. The tongue and groove joint 86, 90 are pushed together for assembly as shown. In this case, each insulating half-shell 44, 46 always on one side of the edge 84, the groove 86 and on the other side of the edge 88, the spring 90. The insulating half-shells 44, 46 of the torque wrench 10 and also the insulating shells 50, 52 of the exchange system can be put together so easily.

10

torque wrench

12

change system

14

insulation

16

casing

18

handle part

20

lever

22

receiving end

24

detent mechanism

26

receiving sleeve

28

Aufsteckmechanismus

30

plug-in modules

32

ratchet

34

socket wrenches

36

Square Drive

38

actuating button

40

gear lever

42

display

43

Insulating disc

44, 46

Insulating half shells of the torque wrench

48

Isolation of the exchange system

50, 52

Insulating half shells of the exchange system

54

thumbwheel

56

attack

58

gear

60

pawl

62

actuating pin

63

spring element

64

vertical bore

66

detent mechanism

68

stamp

70

pen

72

cross hole

74

detent ball

76

spiral spring

78

recess

80

Connection plug element

82

Plunger

84

edge

86

groove

88

edge

90

feather

92

welding means

94

connection

96

opening

Claims (10)

Electrically isolated tool and / or measuring device with a) a housing (16) with a handle (18), b) an electrical insulation (14) which surrounds the housing (16) and the handle (18) and c) a changing system (12) for receiving plug-in modules or plug-in modules (30),
characterized in that d) the change system (12) has an electrical insulation (48). Electrically insulated tool and / or measuring device according to claim 1, characterized in that the plug-in or plug-on modules (30) have an electrical insulation. Electrically insulated tool and / or measuring device according to one of claims 1 or 2, characterized in that the electrical insulation (14, 48) consists of two half shells (44, 46, 50, 52), which are composed. Electrically insulated tool and / or measuring device according to one of claims 1 to 3, characterized in that the half-shells (44, 46, 50, 52) with spring (90) and groove (86) are composed. Electrically insulated tool and / or measuring device according to one of claims 1 to 4, characterized in that the tool and / or measuring device is designed as a torque wrench (10) or torque screwdriver. Electrically insulated tool and / or measuring device according to one of claims 1 to 5, characterized in that the exchange system (12) for receiving plug-in modules or plug-in modules (30) has an electrically insulated mechanism (38, 66) for releasing the plug-in modules or plug-on modules (30). Electrically insulated tool and / or measuring device according to one of claims 1 to 6, characterized in that the electrical insulation (14, 48) has a glass fiber reinforcement. Electrically insulated tool and / or measuring device according to one of claims 1 to 6, characterized in that the electrical insulation (14, 48) contains polyphthalamide. Electrically insulated tool and / or measuring device according to one of claims 1 to 8, characterized by an electrically isolated switching (40) for a right and left suit. Electrically insulated tool and / or measuring device according to one of claims 1 to 9, characterized in that components of the exchange system (12) consist of non-conductive material or provided with an insulation (14, 48) coated.

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