DE2411449A1 - Multipurpose adjustable torque spanner - has torque sensing spring and illuminated display for correct torque - Google Patents

Abstract

This spanner can be used optionally as a torque spanner and the other end can be used as standard spanner. The spanner has in a seat a spring which is able to accommodate deflection equal to half the difference between across flats and across corners. This deflection is reached when the nut or bolt is tightened to required torque and the deflected spring closes and electric circuit powered by battry. The light bulb provided produces light beam which is passed through the gap created on deflecting the spring. The light indicates the required torque.

Description

Patent Description Multipurpose Tool The invention relates to a Tool with which fasteners with screw thread such as hexagon nuts and hexagon screws- fasten and loosen the special feature of the invention consists in using the tool both as an Ior: nalsohraubensohltissel and can be used as a torque wrench. Because of this, the tool was made given the designation "multipurpose tool".

The tool can be designed so that it is on a Side as a torque wrench and on the opposite side as a normal wrench can be used (see e.g. sheet 2, figure 4). There is also an embodiment of the tool possible with the different sizes of hexagon nuts or hexagon screws can be sucked in or loosened on only one side (see sheet 1, fig. 2). If the tool is used as a torque wrench, e.g.

the hexagon nut up to the handle 8. On the other hand, it will same tool used on the same side as a normal wrench, so the hexagon nut is only grasped with the tips of the mouth opening and the nut tightened or loosened. It is particularly important to note that everyone is different designed or otherwise constructed, adjustable screw Patent description Multipurpose tool sheet 2 wrench used or designed as a torque wrench can be. The spring part 2 '' 'can also be in the movable part 9 as in FIG the fixed handle part 8 is installed. Several exemplary embodiments show how that both the shape of the normal wrench and the shape of the torque wrench together with the spring part 2 '' 'can be designed differently.

The following basic principle applies to the torque wrench: 1.) It is assumed that a hexagon nut or hexagon screw complies with the regulations should be tightened. That means that the nut or screw is just as tight may be tightened, so that on the one hand the screw thread is not too tight is damaged and on the other hand no self-loosening of the nut or the screw done by strong vibration.

2.) To achieve this purpose, reference is made to the fact, that e.g. the external dimensions of a hexagon nut vary depending on the size of the same are and a well-known "s-dimension" = width across flats and an equally well-known one have "e-dimension".

The difference between "s-measure" and "e-measure" is denoted by "x" (see sheet 1, Fig.1 and Fig.3). at Patent description multipurpose tool Sheet 3 rotation of the nut by the wrench takes alternately once the "e dimension" and the other time the "s dimension" the same career path.

The spring part 2 '' 'is basically designed so painfully that it has a Continuous suspension of the order of magnitude "x" withstands, does not break and is self-retaining can be pushed into the handle 1 or 8 without any loose fastening parts can (see Fig.1-6). The strength of the suspension of part 2 '' 'depends on how the preload of the screw connection should be strong. If the spring part 2 is without Lines indicated, this means that the screw connection has a normal preload Has. The more lines there are above the 2, the stronger the suspension or preload must be for the screw connection. Otherwise, the shape of the spring part 2 ″ can be fundamentally different (see sheet 1 and 2, fig. 1-6). Make the shapes shown in the pictures only represent exemplary embodiments. Further differently designed embodiments are included if they serve the same purpose.

In sheet 1, fig.1, top picture, it is shown how the spring part 2 '' 'is pressed or tensioned by the dimension @ as soon as the desired preload for the screw connection is reached.

When the spring part 2 '' 'is tensioned, it presses on the sliding attached part) (see sheet 1, Fig.1, upper illustration) around the wet x on the Dry cell battery part 4. The dry cell battery part 4 is supported by a spiral spring (part 5) with the light bulb Patent Description Multipurpose Tool Sheet 4 (part 6, Fig.1), lower picture, connected.

By pressing part 3 on part 4, the spiral spring becomes part 5 compressed by the dimension x and pressed against part 6 (see Fig.1, top picture). By touching part 4 with part 6, the light beam is created on the pear Part 6 and thereby automatically and externally visibly indicates that the screw connection has been tightened with the required preload in accordance with regulations.

In sheet 1, fig., It was pictured how the spring part 2 "' When the hexagon nut is turned, it is pushed through by the dimension x s and this creates a gleam of light or a beam of light arises on the tool. Part 7 of Fig.1 represents a cling film so that it becomes visible how the contact between the spring is made.

part 2 '' 'is made for parts 4, 5 and 6. Becomes explicit notes that the tool can also have another construction in which For example, only the light @ xhein can be seen from the outside if the mother is in compliance with regulations is attracted.

In the figures 2.6 different embodiments are shown, where no light construction is provided.

Here is only indicated by pressing the spring part 2 '' ', that the nut or screw is properly tightened when the spring part 2 '' 'is pushed through by the dimension x. Overtightening the nut or the Screw is Patent description multi-purpose tool sheet 5 impossible, because if the nut is tightened further, the spring part 2 '' 'will iniaer again be tensioned and would be relaxed. In addition, by clicking the spring part 2 '' 'is audibly indicated, that the nut or screw is properly tightened. Too easy Tightening the nut is also impossible, since the bottom part 2 '' 'only then turns the dimension x yields when the resistance is correspondingly great when tightening.

Claims (1)

Patent description (Additional application) Multipurpose tool The patent description is the same as for the main registration from 10/9/73. The file number of the main application is P 23 50 579.5 and G 73 36 382.3. Claim: multi-purpose tool according to patent application from 10/9/73, Äktenzeichen P 23 50 579.5 and G 73 36 382.3, characterized in that any shaped wrench (see Figure 7) or wrench head (see Figure 8) has a partially open round hole into which a self-retaining Spring part 2iII protrudes.