FR2869253A3 - Torque wrench or other torque checking instrument, comprising color coded scales for imperial and metrical data - Google Patents

Abstract

The tool (10) is assembled of a housing (12), accommodating the measuring mechanism, a handle (14, 16), and an element (20) for joining the tool (10) to the workpiece to be checked. A scale (24, 26), which can be analogue or digital comprises a imperial and a metrical area (28, 30), both easy to differentiate by their own color code. The data can be presented simultaneously, facilitating the comparison, or individually in the chosen mode. The tool (10) can be designed in the shape of a wrench or as a screwdriver.

Description

1 DESCRIPTION

  A torque tool for measuring and / or applying a tightening torque, comprising an elongate housing having a handle at one end, and providing a measuring device for detecting the tightening torque and located in the housing, a connecting element transmitting the tightening torque of a workpiece to the measuring device and a display displaying the set tightening torque and each time applied.

  Torque wrenches and screwdrivers equipped with a measuring device and / or trigger torque are used to determine the tightening torques. Torque wrenches usually consist of an elongated lever arm with a handle, with measuring equipment on the lever arm. The lever arm is often made in a box so that the measuring equipment can be housed. In order to transmit the tightening torque generated by means of the torque wrench to a workpiece, there is provided at one end of the lever arm a connecting element biting on the workpiece to be measured. The torque wrenches are partly designed to display not only the tightening torque applied each time, but also to be triggered in case of defined tightening torques, c. to d. that the tightening torque is transmitted only up to a set quantity. Torque wrenches are disclosed for example in German Patent DE 3710401 A1.

  Display devices are known displaying the respective tightening torque and the tightening torque settings. For this purpose, a single unit of measurement is usually used. However, if a torque wrench of this species is to be sold in a country using other tightening torque units, the scale must be changed. Therefore, torque wrenches using two different measurement scales are known. However, in this case, the measurement scales can be easily confused, which leads to adjustment and read errors.

  Therefore, the object of the invention is to create a dynamometric tool that overcomes the drawbacks of the state of the art and facilitates a reading and, thus, an adjustment of the measurement scale.

  According to the invention, the problem is solved by the fact that, in the case of a dynamometric tool intended to measure and / or apply a tightening torque of the species named above, the display is made in such a way that to represent at least two different units of measure, each unit of measurement having its own color.

  In an advantageous modification, the dynamometric tool is made each time as a torque wrench or a screwdriver.

  The fact that the display is made in digital display in the case of the torque wrench according to the invention proves to be an advantageous modification of the invention. This makes it possible to adapt the display to each measurement unit chosen if the display is electronically controlled. The digital display is preferably in color so that each unit of measure can have its own color.

  In another modification of the invention, the display is made in analog display. This variant is particularly applicable in the case of mechanical torque wrenches having no electronic system. As a result, they are not sensitive to electronic disturbances. Thus, the torque wrenches of this species can also be used rather in a dangerous environment that does not allow any spark.

  A preferred embodiment of the torque wrench according to the invention also results from the fact that different units of measurement can be represented simultaneously on the display. This makes it possible to compare at any time the different units of measurement to each other.

  In a particular modification of the invention, several orders of magnitude of a single unit can be represented. This makes it possible to read and set different orders of magnitude on the same measuring instrument. This is particularly important for precise adjustment of a torque wrench. Each precise setting can be associated in color with a less precise setting, allowing a quick and safe reading and setting.

  Other advantages result from the drawing accompanied by the description.

  Fig. 1 shows in the form of a block diagram a torque wrench according to the invention provided with a display having two different measurement units.

  A dynamometric tool according to the invention made with a torque wrench is indicated by 10 in FIG. 1. The torque wrench 10 comprises a measuring device provided in an elongate housing 12 of the torque wrench 10. This is the reason why the measuring device is not visible. A handle 16 surrounds the elongated housing 12 at one end 14 of the torque wrench 10 and at the other end 18 is a connecting member 20. The connecting member 20 is usually made of a square on which a hollow tool is inserted to connect the workpiece to be measured. The tightening torque preset and measured each time by the measuring device is shown on the display 22. The display 22 is shown in the exemplary embodiment present in analog display. The display 22 comprises 22 different scale ranges 24 and 26, the scale ranges 24, 26 having different colors. The ladder ranges 24, 26 show two different scales 28, 30 for different units. Color constituting good contrasts is preferably used to facilitate reading.

Claims (7)

4 CLAIMS   A torque tool (10) for measuring and / or applying a tightening torque, comprising an elongate housing (12) having a handle (16) at one end (14) and providing a measuring device for detecting the tightening torque and located in the housing (12), a connecting element (20) transmitting the tightening torque of a workpiece to the measuring device and a display (22) showing the set tightening torque and each time applied, characterized in that the display (22) is designed to represent at least two different measurement units, each measuring unit having its own color.   2. Dynamometric tool (10) for measuring and / or applying a tightening torque according to claim 1, characterized in that the dynamometric tool is made of a torque wrench.   3. Dynamometric tool (10) for measuring and / or applying a tightening torque according to claim 1, characterized in that the dynamometric tool is made of a screwdriver.   4. Torque tool (10) for measuring and / or applying a tightening torque according to any one of claims 1 to 3, characterized in that the display (22) is made in digital display.   Dynamometer tool (10) for measuring and / or applying a tightening torque according to any of claims 1 to 4, characterized in that the display (22) is made in an analogue display.   Dynamometer tool (10) for measuring and / or applying a tightening torque according to one of Claims 1 to 5, characterized in that different units of measurement can be represented simultaneously on the display (22).   Torque tool (10) for measuring and / or applying a tightening torque according to any one of claims 1 to 6, characterized in that different orders of magnitude of a single unit can be represented.