DE2309783A1 - SPEED CONTROL DEVICE FOR A PORTABLE ELECTRIC TOOL - Google Patents

Description

Patent attorneys Dipl.-Ing. R Veickmainh,

Dipl.-Ing. H. Weickmann, Dipl.-Phys. Dr. K. Fincke Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, THE "***" POST BOX 860 820

MÖHLSTRASSE 22, NUMBER 48 39 21/22

(983921/22)

SEIL (BEDERLAND) H.V., Konijenberg 60, Box 267, Br «da,

Mi «derland

uesohwindigkelteControl device for «in portable · β

electrical factory

The invention relates to devices for controlling the speed portable electrical tools such as drills and saws. In particular, see the invention on solo speed control devices that are in the? Or » an accessory device in the housing of the long-term portable Tools can be mounted and the speed of the factory ■ otor control or vary so that you can switch the motor on and off.

Ctesohwindlgkelts tax payments of the type mentioned Bind For example, see U.S. Patents 3,209,228, 3,260,827, 3,594,523, 26,781, and 3,543,120. All of these Patented devices controls a single control element, the pusher aa Werkseug, the Ein-Aue contacts and auoh the movable element of the rheostat · Ib Oebrauoh der Werkseuge old such well-known speed declarations is the operator, i.e. the Drüoker, depressed, among other things, do the circle wherever you go the engine of the associated plant is included And it runs at its slowest speed When the pusher is pressed, the OrOSe of the rheostat is set changed so that the speed of the factory sugBO-gate SUBlBBt. If the DrUoker was this vekmaat

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digkeitasteueinrichtungen Great depressed come Lift-off switch contacts for great speed ins Game, whereby the tool motor is operated independently of a power supply line TOa control circuit at great speed will·

When using solo speed control devices with a single control element, the tool motor can only be operated in accordance with a given sequence which is as follows: First switch on the motor; second, increasing the motor speed τοη the lowest speed to the highest speed achievable by the control circuit; thirdly, operation at full speed independent of the speed control circuit. The mentioned sequence can be reached by pressing the handle τοη its τοίΐ extended position into the fully depressed position. When the trigger is released _} the opposite sequence of the punctures of the tool motor takes place

When using certain portable electrical tools, e.g. sawing, it is desirable to use the speed control function to make independent τοη the actuation of the Mn-Off contacts and the auxiliary air contacts for full Speed · For example, it can be desirable to produce a certain value of the variable resistor in order to achieve a to have selected operating speed, and then select turn the motor on and off so that the motor either runs at that particular speed or even nioht. In addition, it can be beneficial in the use of similar tools on certain occasions if one τοη the chosen one Speed can switch to operation at great speed practically immediately without one gradually increases the speed of the motor ¥ <m the selected speed to the speed determined by the steering circuit attainable Höohatgeeoh ^ lndigkeit increase got to.

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It is already known «in speed control devices of the general type under consideration here, a control to provide for the rheostat that is separate from the on-off switch; this is based on the Australian Patent specification 242 179 of October 25, 1962 is referred to. The circuit and switch arrangement according to this patent specification has a number of deficiencies. One such Naohteil is that the rheostat and the on-off switch as completely separate Components are provided, thereby creating a complicated and costly installation of this circuit and the Components results. Another disadvantage is that the control of the rheostat and the handle in this Australian patent are arranged at a distance from each other, so that the type of operation of the tool is severely restricted.

The invention relates to a speed control device of unitary construction which is easy and convenient to move into the housing of a portable electric tool can be mounted and the specially attached controls has to independent control of the speed control function and keeping it on-off and operating at full speed

The object of the invention is to provide a new and improved speed control device with independent controls for speed control and for holding on and off to accomplish. The two operating elements should be arranged side by side in such a way that they can be used by the user of the tool can be conveniently and easily operated manually «

To achieve this object, the invention provides a tool housing attached control element for the speed control before, the one with the movable element of a control resistor stands and it is coupled for common movement, as well as a second control element next to this control element

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sum on-off, that is independent of the first control element let and that with the moving contact of on-off contacts engaged in a speed control circuit is, so that the input-Aue-B "operating element also this Contacts operated »in order to be independent of the speed control relay a rolling speed of the Werkaeugmotor vor-Busehen. Purely the two independent operating elements can separate Rastmlttel be provided.

Wolter, "Einselhelton and the provisions of the invention result" loh an exemplary embodiment from the following description on the basis of the accompanying awards · Ee seigern

Pig.1 a Seitenaneioht the inventive Gesohwindigkeltssteuereinriohtung;

Pig · 2 a side row of the speed control device from the aur Pig «1 opposite side;

Figure 3 is a view along the line 3-3 of Pig.1; Pig.4 «ineicht from below near the line 4-4 of the Pig · 2; Pig.5 «in« Final view near line 5-5 of Pig »1; Pig 6 "in" end view near the line 6-6 of Pig.1;

Pig.7 shows a vertical section of the speed shown in Pig.1 It is worth the cost of the unexpanded Divide, primarily the rheostat and the control for this illustrates;

Pig β a vertical sonicity through the speed

control unit of the Pig.1 with pulled apart Share, with primarily the on-off and lift-off contacts and whose operating element are shown;

fig · 9 «in a sectional view close to the line 9-9 of the pig · 7;

Pig. 10 a section close to the line 10-10 of Pig. 7; Pig.11 a section view along the line 11-11 of Pig.7;

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Pig. 12 and 13 isometric parts of the service team for the on-flood and secondary bottom contacts j

Figure 14 and 15 isometric Aneiohten dee Bedienungeelementes door, the movable member dee Regelwideretandee;

Pig · 16 is an isometric representation of the movable element des Regelwideretandee;

Pig · 17 is an iso-equivalent of the moving contact, which is functionally assigned to the fixed contacts in order to form in-flood contacts and secondary base contacts;

Pig. 18 an electrical circuit diagram of the speed control device according to the invention in connection with an electric in-line motor or universal motor.

The speed control unit according to the invention has a housing 10, which consists of an upper housing part 11 and a lower housing part 12. The upper housing part 11 has an approximately inverted U-shape, viewed from the front and the rear, with a deodorant wall 14, an end wall at one end (the upper housing part is open at its other end) and rare walls 16, 17t Planeche 18 or 19 that are stepped downwards on the outside have

The lower housing part 12 has approximately the shape of a parallel opipedon, which is open at the top and has end walls 20, 21, side walls 22, 23 and a bottom 24. The floor is roreugs white with animal openings 24a for the reception of the Paohmann well-known push-in soles. The lower housing part 12 is in the space between the splashes 18, 19 dee upper housing parts 11 added. For this purpose are the rare walls 22, 23 of the lower housing part 12 provided with a vase 26, which is in a hole 27 in the respective Plansoh 18 bsw 19 is included

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The lower housing part 12 has a chamber 27 in which the various components of a Gresohwindigkeltsateuersohaltung are housed. As a precaution, the chamber 27 contains a ceramic Sohaltplatte τοη of the type »as in U.S. Patent No. 3,543,120 mentioned. An aolohe Sohaltplatte 28 carries on its one side two printed, aligned resistance strips 29, 30 (FIG. 10). As a 18 shows, on one side of the holding plate 28 there is also a controllable semiconductor, for example a silicon rectifier 32, printed on, the gate of which with a suitable trigger device, for example a diode 33 »is connected. The same side of the holding plate according to PS above carries a capacitor 34 and a fixed resistor 35, and these two components are connected to a common connection which is grounded with the diode 33 /.

A solicitor 37 (Fig. 16) of a rule resisted it shows "iiie Stützleiβte 38 with an upwardly bent end 39, the a sliding contact 40 carries. The sliding contact has four downward facing sole finger 41 on both sides slide along the upper edge of the record 28. Two of the Grinding «? 41 »that are in the same plane the resistance astrip 29 bsw. 30, uss such a rheostat to form

What more details of the ceramic circuit board with the various electronic elements of the speed control circuit See US Pat. No. 5,543,120. Such a circuit preferably has no feedback, as described in US Pat. No. 3,209,228.

In the space between the WSx, 16 and 17 of the upper housing part 11, an elongated holding rod 43 is accommodated to and fro. The holding rod 43 has a side wall 44 which rests against the inside of the housing wall 17. The other side of the receiving rod 43 is held by a

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Wall 45 is formed, which has a hat 46 running in the longitudinal direction the purpose of which will be explained later. The shift rod 43 has a downwardly projecting flange 48 which, together with the housing wall 17, has a pocket 49 «for receiving the soleplate 37 of the rheostat forms. In addition, the switching rod 43 has a bar 50 and an ear 51, which “wipe” each other leave a gap 52 in which the upstanding end 39 of the Stüteleiete 38 is received. To this In this way, a sliding movement of the wiper 37 occurs when the shift rod 43 is moved. "

The bar 50 has a series of teeth 54 which form a straight toothed rack. The teeth 54 are in mesh with teeth 55 arranged on a circle, which form a ritcel on one end of a shaft 56 (9ig.11) · The shaft is rotatably mounted in a section of the wall 17 of the upper housing part 11. The shaft 56 carries a sleeve 57 on which a steering wheel 58 sits · By the engagement of the Riteeis 55 with the rack 54 is the rotation of the steering wheel 58 in a straight line displacement of the shift rod 43 iß by the Rotation direction of the steering wheel 58 converted specific direction.

The steering wheel 58 has an annular arrangement τοη notches 60, which one after the other τοη a Rastror jump 61 (Pig.1), which is formed on a detent spring 62 is. The latter is conveniently on the outside of the upper housing part 11 is supported next to the side wall 17. This locking construction releasably holds the steering wheel 58 in each selected position

The steering wheel 58 is preferably with a curved depression 64 is provided, in which a socket pin 65 is received. The Ansohlagstift 65, which is in a suitable manner on the flange 19 of the upper housing part is held, has such a position that it alternates at the two ends of the recess 64 but

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Attachment comes and so as a stop eur limitation of the rotary movement of the steering wheel 58 serves to avoid jamming and / or damage in the event of the operator further exerts a rotational force on the steering wheel 58 after the switching rod 43 the limit of their range of motion has achieved that by the location of the teeth at the extreme end the rack 54 is intended "

You speed control device according to the invention preferably has fixed and movable contacts of the type described in US Pat. No. 3,594,523. These Contacts form an on-off switch and also a bypass switch to keep the tool motor independent of the Velocity control circuit directly from the power supply line To be able to operate bit at full speed · GE ■ äS of the aforesaid patent, a horizontal dielectric plate 67 carries a contact strip 68, a first Contact button 69 and a second contact button 70. A movable contact 72 with an upward protrusion alters the fixed contacts 68, 69 and 70 together and forms the on-off holder and the bypass switch; on which way this switches with the speed control attitude are connected, can be seen from Fig. 18 «

An actuating element designated as a whole by 74 has a rod 75 and a protruding finger-operated portion 76. The rod 75 of the actuator 1st between the switching rod 43 and the wall 16 of the upper housing part 11 movably supported. To the holding rod 43 and the actuating element 74 versohieblloh against each other To make, the latter is provided with a longitudinally running rib 77, which is versohleblioh in the groove 46 of the holding rod 43 is added · The deodorant wall 14 of the upper housing part 11 has a base seat 14a in the 4-way operating part 76 of the actuating element 74 is added «

The actuating element 74 has an integrally formed spring arm 78,

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on which an upstanding latching lug 79 is formed, which can snap into one of the openings 80, 81 or 82 (Pig · 3). When the latching lug 79 is received in the opening 80, the actuating element 74 is in the "off"position; When the locking lug 79 is in the opening 81, the actuating element 74 is in its "on ¹¹ position. If the actuating element 74 is moved until the locking lug 79 engages in the opening 82, the" full speed "or bridging position is established ·

The actuating element 74 has a cavity 84 (FIG. 8) which has a depression 85. The cavity 84 loosely accommodates the movable contact 72, the protrusion 73 standing near the top lying in the recess 85 below. The cavity 84 also has a further recess 86, which contains the upper part of a small helical spring 87 under · the end of this spring rests against the movable contact 72 and presses it down into engagement with the fixed contacts ·

When the actuating element 74 is pushed back and forth, the movable contact 72 is displaced. The actuating element 74 is shown in Figure 8 in its ⁿ from ^N position, the movable contact 72 only being in connection with the fixed contact 68. When the actuating element 74 is moved to its "on" position near the right as shown in Fig. 8, the movable contact 72 is brought into a bridging position with the contact strip 68 and the contact button 69. As more precisely in the aforementioned US Pat. No. 3,594,523 described, the movable contact 72 is pivoted or locked into engagement with the fixed contact 69 so that the risk of arcing and / or pitting of the contacts is reduced for high speed, the movable contact 72 creates a bridge between the contact strip 68 and the contact button 70}

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in this position the movable contact 72 has no contact with the contact button 69

As can best be seen from ilg.11, the steering wheel 58 is in the vicinity of the upright operating part 76 of the actuating element 74, so that the user of the tool provided with the speed control according to the invention can regulate the speed and also the input and output with a single pinger The steering wheel 58 or the adjacent part of the housing of the speed control device 10 or the adjacent part of the housing of the associated tool is preferably provided with an indicator which indicates the direction in which the steering wheel 58 must be turned to increase the speed dea tool motor or reduce. Preferably, there is also a display on the operating part 76 of the actuating element 74 which indicates the "off", "on ¹¹ " and "full speed" positions.

Due to the independent function as »a steering wheel 58, the the (»» so speed assertion exerts, and the actuating element it 74 that both the on-off and the operation controls at full speed, the user of the tool with the speed control according to the invention has • Extensive freedom of operation for the tool * If that Actuating element 74 is moved into the "on" position, the tool motor is switched on and runs at the speed given by the position of the switching platform 43 which in turn is controlled by the steering wheel 58 · The. separate locking means for the control * & £ 58 and the actuating element 74 serve to hold these two elements in their chosen position. If the actuation element & e% 74 is in the "on" position,% ann the steering wheel 58 in each direction can be rotated, among other things, increase or decrease the speed as desired. If the user has the

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Tool at any point in time the roll speed wants to have, the actuator 74 is pushed to the position for roll speed, as described above, whereby the Gesohwindigkeltssteuerschaltung is bridged and the tool motor is operated at roller speed directly from the power supply line at maximum speed it is not necessary to move the steering wheel 58 and the speed rorher rorhandenen to increase slowly

When the tool is no longer required to operate at roller speed, the actuating element 74 can be in the "on" position be fed back, whereby the motor is re-energized to run at the speed selected by the steering wheel 58 rorher. When the tool motor is switched off is to be operated, only the actuating element 74 is actuated, whereby an instantaneous shutdown is possible. Said the steering wheel 58 is not required to switch off the tool motor, the speed control remains in the condition to continue working with the previously chosen Gesohwindigkelt, when the actuating element 74 is returned to the "on" position. The speed control circuit according to the invention gives the possibility of repeatedly using the associated tool with a selected by the control wheel 58 Let speed work

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Claims (1)

Claims Speed control device for a portable electrical tool or the like, characterized by a) «in the housing (10) which is mounted in the tool or the like is, to) a Vorrlohtungteil (28) in the housing, which a · speed sateuersohaltung old «in a rheostat (29, 30, 37-41) forms the speed of the associated motor depending on the resistance value of the variable resistor Is changeable, o) a sound hand-operated actuator (43) for controlling the speed, which is movable in the housing supported 1st and with the movable element (37) dee rheostat Is engaged in such a way that the latter moves duroh a movement of the actuating element will, d) Ein-lue-Schaltkontaktβ (68, 69) with a moving one Contact (72) built into the control circuit to open and close the latter and e) a second τοη hand-operated Ein-Aue actuating element (74), which is in the housing next to the speed actuator (43) and independently τοη the latter is movably supported and with the movable contact (72) is so engaged that the on-off contacts through the movement of the second actuating element (74) can be actuated 2 · Device according to claim 1, characterized duroh a) a first locking arrangement (79t 80, 81) which engages with the Xin-Atts actuation cleaent (74) in order to ^{lock the latter in an N} Kin "division and in an" Aus ^M position lttsbar z " b) a second latching arrangement (60, 61), which is the speed control actuating element (43) is assigned to hold the latter in each selected position 309837 / 041A 3. Device according to claim 1 or 2, characterized in that that a) the speed actuator (43) from one first elongated part consists of back and forth is held, and b) the on-off actuating element (74) from one «wide elongated part is made, which is held back and forth is, weave the first and the second elongated part are independent of each other 4 · Device according to claim 3, characterized in that a) the first elongated part (43) «ine row of teeth (54) which form a rack, b) a pin (55) attached to the housing, which is old the toothed rack · is singularly, and o) a τοη hand operated steering wheel (58) with the Ritsel is coupled such that rotation of the steering wheel results in rectilinear movement of the first elongate member (43) is implemented 5 # device according to claim 1 or one of the following claims, characterized in that a) a fixed contact (82) is mounted such that it τοη the movable contact (72) is detected when the on-off Betätlgungselement 74) speed is moved (to a position door Tolle, and b) further switch connections with the fixed contact (82) and the movable contact (72) are gate, through which the associated motor is operated independently τοη the speed control control when the Eln-Auo «message element Moved to roll speed position 1st. 6 «öesohwlndlgkeitseeuerungseinriohtung, which is in a portable olektrisehen Werkseug or the like. mountable 1st and don Controls the motor of this Verkseugos, and which has a housing 309837 / (KU has that a device part with a rule counter et and including speed control posture such that the speed of the motor in accordance with the change in resistance value of the reränderbar is reränderbar, wherein in the housing also fixed and movable contacts are included, which are in the control circuit to the latter Open or close, in particular according to one of the claims 1 to 51 marked duroh a) a first actuating element (43) which is movably held in the housing (10) and with the movable one Element (37) of the variable resistor is coupled in such a way that that the latter is moved upon movement of the first actuating element and b) a wide actuator (74) »that in the housing (10) is supported for independent movement with respect to the first actuating element and that with the movable one Contact (72) is so engaged that it actuates the latter, so that this the circuit accordingly the movement of the second actuating element opens or closes, whereby the associated motor is locked or unlocked without moving the first actuating element 7 «device according to claim 6, characterized duroh a) a first latching arrangement (60, 61) which is in engagement with the first actuating element (43) to move the latter into to hold detachably in each selected position, and b) a second latching arrangement (79, 80, 81) with the second actuating element (74) is engaged to the latter alternately at least in an "on" position and in to hold an "Auβ" position releasably. 8 · device naoh claim 6 or 7, characterized in that
a) the first actuating element consists of a first longitudinal 309637 / (UM Chen part (43) is held back and forth pushable 1st and has teeth (54) that form a rack form, b) A riddle (55) is held on the Oehauββ (10), which with the rack! ■ is engaged, o) a tone hand-operated steering wheel (58) as old as that Riddle (55)! ■ Engagement is that the rotation of the steering wheel is converted into a straight sliding movement of the first actuating element, d) the wide actuating element consists of an elongate part (74) which is supported for a to-and-fro sliding movement is, where the first and the second elongated part are independently of each other Tersohleblioh Device according to Claim 6 or one of the following claims, marked by a) a fixed contact (82) which is arranged such that it is detected by the movable contact (72) when the wide actuator (74) is moved to its full speed position, and b) further connections with the fixed contact and the moving contact of such a kind that the engine is independent of the public health control is actuated when the wide actuating element is in its position for full speed. 309837/04 U Blank page