EP1502708A1 - Torque wrench - Google Patents

Abstract

The display (5) for the set torque force comprises a digit wheel counter (47). The counter comprises at least two digit wheels connected via a gearing and is connected to the wrench handle (3) via a rotary spindle tube.

Description

The invention relates to a torque wrench.

Torque wrenches are used in a wide range of applications in practice used wherever screws with a defined torque and must be tightened to a specified bias. The wished Torque is adjusted by turning a compression spring in which the with a threaded spindle connected handle relative to the housing of the torque wrench is turned. The housing is usually characterized by a in Diameter circular lever tube formed at the front end of a Tool head, such as a gun, and at the rear end of the Handle carries.

To the respectively set torque when using the torque wrench To secure against misalignment, the handle is in the Use position set on the lever tube. The set torque is readable on an advertisement. Mostly the ad is currently usual torque wrenches designed as a scale or vernier. These Embodiments have basically proven, but is the setting or reading the torque in a way cumbersome because initially a coarse adjustment and then a fine adjustment of the desired Torque must be made, with the two added together Need to become. This is not always advantageous in practice.

There are also torque wrenches with an electronic display of the Torque. However, these are both what the structural design as also the electronics and their energy supply, consuming.

The invention is based on the prior art, the task, a torque wrench with an improved display of the set To create torque.

The solution to this problem consists according to the invention in a torque wrench according to the features of protection claim 1.

The essence of the invention is the measure that the display is a Zahlenrollenzählwerk includes. In this way, a mechanical-digital display created.

It is a precise adjustment of the desired torque possible, where the set value can be simply read off as digital digits. The number plate counter works reliably and accurately. A separate power supply for the ad is not required. The numeric counter is on one set certain basic or starting value, for example, 20 Nm. From Starting from this position, the adjustment can go to higher values and back respectively.

Advantageous embodiments and developments of the basic The idea of the invention is the subject of the dependent claims 2 to 9.

The number-roll counter has at least two number-scrolls, which have a number Gear are linked. In practice, predominantly three digit roles to Application, over which the one, ten and hundreds values of the torque are displayed. For smaller torque ranges can also have tenths, ones and tens on corresponding digit rolls are displayed. The number wheels are over a gear with two gears so linked that with a full rotation of the one-digit role, the tens digit roll each by an equal angle step and a full Turn of the tens digit scroll also the hundred-digit scroll be moved an equal angle step. The respective angle step equals one tenth of a full turn.

The numeric counter is about a rotatable spindle tube with the handle connected so that the rotary motion of the handle on the numeric roller counter is transmitted. In practice, a number role is expediently the one-digit roller and the spindle tube via a sleeve connected. The sleeve has at least one longitudinal slot in which an am Spindle tube provided driver slidably engages. The number plate counter and the associated gearbox are in a robust housing Protected with viewing window arranged, which surrounds the lever tube. in this connection the spindle tube is axially displaceable relative to the housing.

The number wheels of the Zählrollenzählwerks are preferably on the Lever tube stored. This measure ensures a reliable and error-prone operation of the numerical counter.

In an alternative embodiment of a torque wrench with fixed handle, the Zählrollenzählwerk also has a rotatable Spindle with the spindle for adjusting the compression spring of the torque wrench be connected.

Finally, the viewing window can be used to display the set values be equipped with an alternating field, via which a change in the torque units is possible.

Figur 1

einen erfindungsgemäßen Drehmomentschlüssel in einer Draufsicht;

Figur 2

den Drehmomentschlüssel in einem Längsschnitt und

Figur 3

vergrößert den hinteren handgriffseitigen Bereich des Drehmomentschlüssels in einem Vertikalschnitt und einer gegenüber der Figur 2 um 90° gedrehten Darstellung.

The invention is described below with reference to an embodiment shown in the figures. Show it:

FIG. 1

a torque wrench according to the invention in a plan view;

FIG. 2

the torque wrench in a longitudinal section and

FIG. 3

increases the rear handle side region of the torque wrench in a vertical section and a relation to the figure 2 rotated by 90 ° representation.

The torque wrench 1 has a lever tube 2 with a handle 3 as well a tool head 4 and a display 5 for a set torque on. The tool head 4 is in the illustrated embodiment as Umschaltknarre 6 executed with a square pin 7. Basically you can but different tool heads are used, for example Ring, jaw or allen mounting tools.

From the tool head 4, a connecting shaft 8 extends into the front longitudinal section 9 of the lever tube 2, which in this area above and flattened on the underside. Two embedded in the connection shaft 8 Balls 10 form a guide for the connecting shaft 8 in the longitudinal section 9th

The connecting shaft 8 is flattened by a pin 11 at the end 12 of the Length section 9 pivotally mounted in the lever tube 2 and is supported by its end 13 on a so-called tilting cube 14 from.

In the tool head 4 facing away from the end 15 of the lever tube 2 is a tensionable compression spring 16 incorporated in the form of a helical compression spring. The Compression spring 16 is supported with its end facing the tool head 4 via a pressure piece 17 against the tilting cube 14. The tilting cube 14 is located in Recordings 18 and 19 at the end 13 of the connecting shaft 8 and in Pressure piece 17 and connects them in a row force fit rotatably to the Reaching a certain torque. Will that be about the spring tension the compression spring 16 set torque exceeded, the rotates Tool head 4 opposite the tilting cube 14 and the torque wrench 1 trips. This is also an unspecified optical signal generator 20 addressed, so that the triggering of the torque wrench. 1 is shown.

The other end of the compression spring 16 is slidable on one in the lever tube 2 arranged cup-shaped sleeve 21. The jacket of the sleeve 21 is in sliding contact with the inner surface of the lever tube 2.

In the sleeve 21 summarizes an end-side print head 22 of a threaded spindle 23rd Here, the threaded spindle 23 is supported in a spindle nut 24, which in the End 15 of the lever tube 2 is fixed by means of pins 25.

At the profiled end 26 of the threaded spindle 23, this is in a driving body 27 held and a nut 28 with the driving body 27th rotatably locked. The driving body 27 has radially projecting driver 27 ', which protrude in axially extending grooves 3a, 3b of the handle 3, so that the Carrier body 27 rotatably connected to the handle 3 is connected. On the threaded spindle 23 is a spindle nut 29 displaced, which via a pin 30 with a spindle tube 31 is connected.

The handle 3 serves both as an ergonomically designed handle for Force application as well as torque adjustment. Here is the respective Triggering torque adjusted by adjusting the compression spring 16 by the Handle 3 is rotated relative to the lever tube 2 of the torque wrench 1.

The position shown in Figures 1 to 3 shows the position of use of the Torque wrench 1. This means the handle 3 can be in this position not be turned. Consequently, no torque adjustment can be performed become.

In the free end 32 of the handle 3, a locking piece 33 is rotatable incorporated. This points at its lying in the handle 3 end 35th Pin 36 on. On a crown-shaped shoulder 37 of the locking piece 33rd a compression spring 38 is supported, which on its other side on the driving body 27 is present. The pins 36 prevent in the locking position of the locking piece 33, the displacement of the handle 3 in the direction of arrow P, since they are located above the filled stop area of the driving body 27. By turning the locking piece 33 on the recessed grip 33 'to to a stop, which is formed by pins 34, reach the pins 36th via the recesses 39 of the driving body 27th

For torque adjustment by actuation of the threaded spindle 23 of the Handle 3 in the direction of arrow P against the force of the compression spring 38 forward emotional. Here, the pins 36 in the recesses 39 of the driving body 27 pushed. At the same time, the forward movement of the Handle 3 a arranged at the inner end 40 of the handle 3 locking sleeve 41 moved forward. The locking sleeve 41 is in the handle 3 by a End cap 42 secured in position. It can also be seen that in the spindle tube 31 two balls 43 are mounted, with their inner circumference in a groove 44 in the Engage lever tube 2. The locking sleeve 41 has a clamping portion 45 and an enlarged in comparison inside diameter freewheel section 46th on. In the position of use of the torque wrench 1, the balls 43 through the clamping portion 45 of the locking sleeve 41 against the lever tube. 2 clamped, so that a rotation of the handle 3 relative to the lever tube. 2 not possible. In the unlocking movement according to the arrow P is the Locking sleeve 41 moves forward as mentioned. This will get the balls 43 in the freewheel section 46, so that a rotational movement of the handle. 3 and thus a torque adjustment by adjusting the voltage of Compression spring 16 via the threaded spindle 23 is possible.

By turning the handle 3 clockwise, the spindle 23 is rotated and the compression spring 16 stretched. In this way, a higher triggering torque adjusted as a result of the increase in the frictional connection. simultaneously is rotated about the spindle nut 29 and the spindle tube 31.

About the spindle tube 31 is the handle 3 with a Zahlenrollenzählwerk 47th connected to the display 5. The number-roll counter 47 includes three digit scrolls 48, 49, 50, which are mounted on the lever tube 2 and a transmission 51st are linked. The number wheel 48 shows the one-values of the three-digit Display 5 on. On the number role 49 are the tens and on the Number wheel 50 are the hundreds of set torque values read.

The number-roll counter 47 is arranged in a robust housing 52, which surrounds the lever tube 2 and a viewing window 53 for reading the Having triggering torque. As can be seen from the figure 1, is at the embodiment shown here, the triggering torque to 158th Nm set.

The spindle tube 31 is axially displaceable relative to the housing 52, wherein the Spindle tube 31 is connected via a sleeve 54 with the number role 48. In the Sleeve 54 longitudinal slots 55 are provided, in which the spindle tube 31 located Driver 56 slidably intervene. When turning the handle 3 the spindle tube 31 is rotated and moved to the left in the image plane. in this connection pushes it into the sleeve 54. About the driver 56, the sleeve 54 and so that at the same time the number role 48 rotated. Slide in the longitudinal slots 55 the driver 56 of the spindle tube 31 forward.

The gear 51 has two gears 57, 58, which on a shaft 59 in Housing 52 are stored. The number wheels 48, 49, 50 are through the gears 57, 58 of the transmission 51 linked so that at a full turn the Number role 48, the number role 49 by an angular step, one tenth of the Turn corresponds to, that is rotated by a tens value. Corresponding at a full revolution of the number role 49, the number role 50 is one Angular step, which corresponds to one tenth of a turn, to display the next hundred-value turned. For this step sequence are to the Numbered rollers 48-50 recesses 60 adapted to the gear geometry and cams 61 are provided which cooperate with the gears 57, 58 and cause a corresponding adjustment of the Zählrollenzähler 47.

About the Zählrollenzählwerk 47 is a mechanical-digital display 5 of the Tripping torque possible. The adjustment and reading of the torque is easy and reliable.

In embodiments of torque wrenches 1, which has a viewing window 53 with Alternating field 53 ', the "Nm" display can change the torque units factory by changing the viewing window 53 in another Unit to be changed.

REFERENCE NUMBERS

1 -

torque wrench

2 -

lever pipe

3 -

handle

3a -

Groove in 3

3b -

Groove in 3

4 -

tool head

5 -

display

6 -

ratchet

7 -

Square pin

8th -

connecting shaft

9 -

longitudinal section

10 -

Bullet

11 -

spigot

12 -

End of v. 9

13 -

End of v. 8th

14 -

Kippwürfel

15 -

End of v. 2

16 -

compression spring

17 -

Pressure piece

18 -

admission

19 -

admission

20 -

signaler

21 -

shell

22 -

printhead

23 -

screw

24 -

spindle nut

25 -

pen

26 -

End of v. 23

27 -

entraining member

27'-

takeaway

28 -

mother

29 -

spindle nut

30 -

pen

31 -

spindle tube

32 -

End of v. 3

33 -

coupling

34 -

pen

35 -

Front side v. 38

36 -

coupling pin

37 -

shoulder

38 -

compression spring

40 -

The End

41 -

locking sleeve

42 -

end cap

43 -

Bullet

44 -

groove

45 -

clamping section

46 -

Freewheeling section

47 -

Ziffernrollenzählwerk

48 -

digits role

49 -

digits role

50 -

digits role

51 -

transmission

52 -

casing

53 -

window

53'-

alternating field

54 -

shell

55 -

longitudinal slot

56 -

takeaway

57 -

gear

58 -

gear

59 -

wave

60 -

recess

61 -

cam

P -

arrow

Claims (9)

A torque wrench comprising a lever tube (2) with handle (3), a tool head (4) and an adjusted torque indicator (5), characterized in that the indicator (5) comprises a numerical roller counter (47). Torque wrench according to claim 1, characterized in that the Zählrollenzählwerk (47) at least two number wheels (48, 49, 50), which are linked via a transmission (51). Torque wrench according to claim 1 or 2, characterized in that the Zahlenrollenzählwerk (47) via a rotatable spindle tube (31) with the handle (3) is connected. Torque wrench according to claim 3, characterized in that a number roller (48) and the spindle tube (31) via a sleeve (54) are connected. Torque wrench according to claim 4, characterized in that the sleeve (54) has at least one longitudinal slot (55), in which a spindle (31) provided on the driver (56) slidably engages. Torque wrench according to one of claims 1 to 5, characterized in that the Zahlenrollenzählwerk (47) in a housing (52) is arranged, which surrounds the lever tube (2), wherein the spindle tube (31) axially relative to the housing (52) is displaceable , Torque wrench according to one of claims 1 to 6, characterized in that the numbered rollers (48, 49, 50) of the Zählrollenzählwerks (47) are mounted on the lever tube (2). Torque wrench according to one of claims 1 to 7, characterized in that the Zahlenrollenzählwerk (47) via a rotatable spindle tube (31) is connected to the spindle. Torque wrench according to one of claims 1 to 8, characterized in that the viewing window (53) is equipped with an alternating field (53 ') for changing the torque units.

Images