JP4764544B2 - Torque wrench tester adapter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the angular drive shaft of a torque wrench for which a set torque is to be measured is fitted and locked to a measurement insertion shaft provided in the torque wrench tester, and the torque of the torque wrench is transmitted to the torque wrench tester. An adapter to be used, in particular, a compact configuration of the adapter, improving manufacturing economy, and further, a torque wrench angle drive of various sizes with respect to a measurement input shaft of a certain size provided in a torque wrench tester. The present invention relates to an adapter for a torque wrench tester that makes it possible to easily and reliably engage and lock a shaft.
[0002]
[Prior art]
For example, in order to measure (certify) the torque characteristics (torque value) of a torque wrench with a ratchet, for example, as shown in FIG. 11, the torque wrench tester 1 has a square hole axis perpendicular to the horizontal plane. An angular drive shaft 4 of a torque wrench 3 with a ratchet to be measured is fitted in the measurement input shaft 2, and a handle portion 5 of the torque wrench 3 with a ratchet is engaged with a loading lever 6. 7, the horizontal position of the torque wrench 3 with a ratchet to be measured is held, and the position of the torque wrench tester measurement input shaft 2 and the angular drive shaft of the torque wrench 3 with a ratchet coincide with each other. To do. In this state, the handle 8 is driven (rotated) to apply a rotational load to the handle portion 5 of the torque wrench 3 with a ratchet, and the toggle link incorporated in the torque wrench 3 with a ratchet at this time is operated. Is used to detect the accuracy of the torque value test or display scale.
[0003]
However, since the shape and size (inner diameter) of the square-hole-shaped measurement input shaft 2 provided in the torque wrench tester 1 are constant, the torque wrench tester 1 conforms to the inner diameter of the measurement input shaft 2 ( The shape and size of the square drive shaft 4 of the torque wrench with a ratchet to be matched is determined by itself. For this reason, one type of torque wrench tester 1 has multiple types of ratchet with different sizes of the square drive shaft. It was impossible to check the torque of the torque wrench.
[0004]
Therefore, conventionally, in order to perform a torque check of a ratchet torque wrench of various sizes, it is necessary to prepare in advance a plurality of types of torque wrench testers 1 having measurement input shafts 2 adapted to the respective angular drive shafts. For this reason, there was a problem in terms of equipment economy.
[0005]
Conventionally, in order to make it possible to check the torque of a torque wrench with various ratchets by using one type of torque wrench tester, for example, as shown in FIG. 12, the measurement input provided in the torque wrench tester 1 is used. A fitting locking hole 9C in which a corner drive shaft of a torque wrench with a predetermined ratchet to be subjected to torque measurement is fitted and locked to a head 9B integrated with the angular shaft 9A fitted in the square hole 2A of the shaft 2. The adapter 9 is formed, and by using this adapter 9, the outer diameter of the angular drive shaft of the torque wrench with the ratchet to be measured for torque is the inner diameter of the measurement input shaft 2 provided in the torque wrench tester. If it is smaller, the angular drive shaft of the torque wrench with ratchet is connected to the measurement input shaft 2 of the torque wrench tester by using the adapter 9. It is that to be able to.
[0006]
[Problems to be solved by the invention]
However, when such an adapter 9 is formed, when the dimensional difference between the inner diameter of the fitting locking hole 9C and the outer diameter of the square shaft 9A is large, the fitting locking hole 9C is Since it is possible to form the head 9B inside the shaft center of 9A, there is no need to provide the head portion 9B. However, the inner diameter of the fitting locking hole 9C is different from the outer diameter of the square shaft 9A by about 2 mm, for example. If a fitting locking hole 9C having a size that is not large is formed, the thickness between the inner diameter of the fitting locking hole 9C and the outer diameter of the square shaft 9A becomes 1 mm, resulting in a thin adapter. As a result, insufficient strength occurs.
[0007]
Therefore, in such a case, the head portion 9B is formed integrally with the square shaft 9A, and the fitting locking hole 9C is formed on the inner axis of the head portion 9B. The height H1 of the head 9B for forming the head 9B must be ensured. For this reason, the size of the adapter 9 becomes large, causing inconvenience in handling, and the height of the head 9B is rough. When the adapter 9 has a large H1, when the adapter 9 is interposed between the measurement input shaft 2 of the torque wrench tester 1 and the angular drive shaft of the torque wrench with a ratchet, as described above, the adapter 9 has a ratchet. An extra position adjustment operation is required to position the torque wrench 3 so that the stem 5 axis of the torque wrench 3 is parallel to the loading lever 6. If the position adjustment operation is neglected, highly accurate torque measurement becomes impossible. Etc. Jill.
[0008]
The present invention has been made paying attention to such conventional problems, and the angular drive shafts of various torque wrenches with different thicknesses of angular drive shafts are fitted into the square holes of one type of torque wrench tester measurement input shaft. It is an adapter that can be locked together, and the adapter has a configuration that can suppress the increase in size, improve the handling workability of the adapter, improve the ease of manufacturing and the economy, and , and to provide superior adapter durability sufficiently to retain the strength as the adapter.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the configuration of the present invention is such that the outer peripheral portion is fitted in a square hole formed at the shaft end of the first shaft member of the torque wrench tester so as not to rotate around the shaft, and An adapter in which the angular axis of the second shaft member of the wrench is non-rotatably fitted to the inner peripheral portion in the direction around the axis, and the lower support plate that can be inserted into the angular hole, and the angular axis penetrates A plurality of upper support plates and a plurality of lower support plates that are spaced apart from the lower support plate and spaced apart from each other in the axial direction. A connecting pin to be installed and a plurality of columnar columnar members arranged with an interval in the direction of the axis between the upper and lower support plates, and the columnar member has an outer peripheral portion at a corner of the square hole. The inner peripheral portion is formed on a flat surface corresponding to the flat surface of the angular axis. To.
[0010]
Therefore, according to the adapter according to the claim 1, it is possible to configure a small-type adapter, furthermore the adapter has sufficient torque transmission strength even smaller.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
[0012]
1 to 3 show the completed adapter, and FIGS. 4 to 10 show each component of the adapter.
[0013]
4 to 10, reference numeral 11 denotes an upper support plate, and a square corner into which a corner drive shaft (second shaft member) (not shown) of a torque wrench can be inserted, for example, in the center of the upper support plate 11. Holes 12 are drilled, and four shaft clamping holes 13 are drilled corresponding to the intermediate positions of each side of the square hole 12.
[0014]
14 is a lower support plate, and the outer shape of the lower support plate 14 can be fitted into the square hole 2A of the torque wrench tester measurement input shaft (first shaft member) 2 shown in FIG. A square caulking hole 15 similar to the axial caulking hole 13 provided in the upper support plate 11 is formed in each square corner of the square hole 2A. Has been.
[0015]
The dimension R ′ between the drilling position of each shaft clamping hole 15 drilled in the lower support plate 14 and the center point P ′ of the lower support plate 14 is the same as each axis drilled in the upper support plate 11. It is set to be equal to the dimension R between the drilling position of the caulking hole 13 and the center point P of the upper support plate 11. Further, a swelled portion 17 for forming a step edge 16 is integrally formed at the center of the upper surface of the lower support plate 11.
[0016]
Reference numeral 18 denotes four connection pins for maintaining the upper support plate 11 and the lower support plate 14 vertically spaced from each other. The upper and lower ends of these connection pins 18 are connected to the upper support plate 11. A small-diameter step portion 19 is formed so as to be press-fitted into shaft caulking holes 13 and 15 formed in the lower support plate 14.
[0017]
20 is a piece pivotally supported on each of the four connecting pins 18 that vertically separate the upper support plate 11 and the lower support plate 14, and each piece 20 is shown in FIGS. As described above, the upright surface 21 in the vertical direction, the shaft insertion hole 22 through which the connecting pin 18 is penetrated in parallel to the upright surface 21, and the pair of back surfaces 24 inclined at 45 degrees with respect to the upright surface 21. And isosceles triangular prisms. Further, the corner formed by the upright surface 21 of each piece 20 and its upper surface A is formed into a corner radius B for facilitating the insertion work of the corner drive shaft or other adapter, and the lower surface C of the piece 20. And a back surface D thereof are formed in a chamfer E for facilitating insertion of the adapter into the measurement input shaft or other adapter.
[0018]
The above are the structural members used to configure the adapter, and these structural members are formed by precision casting (lost wax). Next, the assembly of the adapters using these components will be described. First, the connecting pins 18 are held through the shaft insertion holes 22 of the four pieces 20, and the lower ends of the connecting pins 18 are set to the lower side. The upper end of the connecting pin 18 is inserted into each shaft clamping hole 13 drilled in the upper support plate 11 while being fitted into each shaft clamping hole 15 drilled in the support plate 14. The lower end of the connecting pin 18 is caulked to the lower support plate 14 and the upper end of the connecting pin 18 is caulked to the upper support plate 11 to constitute an adapter 23 as shown in FIGS.
[0019]
In the adapter 23 thus configured, the square holes surrounded by the upright surfaces 21 of the four pieces 20 and the square back surfaces 24 of the pieces 20 are held by the prisms formed in cooperation, and the prismatic surfaces ( The back surface 24 can be fitted and held in the shaft hole 2A of the measurement input shaft 2 provided in the torque wrench tester.
[0020]
Then, if a square drive shaft of a torque wrench to be measured for torque is inserted into the square hole of the adapter 23, the torque wrench square drive shaft is connected to the shaft hole of the measurement input shaft of the torque wrench tester via the adapter 23. 2A can be coupled in the rotational direction.
[0021]
Of course, since the shaft diameter (outer diameter) of the torque wrench angle drive shaft and the inner diameter of the measurement input shaft shaft hole of the torque wrench tester are various, adapters 23 of various sizes that can be adapted to the shaft diameter and the inner diameter are prepared in advance. If there is a large dimensional difference between the inner diameter of the measurement input shaft shaft hole of the torque wrench tester and the shaft diameter of the torque wrench angle drive shaft to be measured, a plurality of adapters of the same configuration with different sizes 23 in combination, that is, by combining a small adapter fitted and held in the square hole of a large adapter, the shaft diameter of the torque wrench drive shaft to be measured is small. However, torque measurement can be easily performed with the same torque wrench tester.
[0022]
Further, in the adapter 23 having the above-described configuration, each piece 20 constituting the adapter is supported by each connecting pin 18 so as to be slightly rotatable about the connecting pin 18 as shown in FIG. (At the lower end of each piece, as shown in FIGS. 2 and 3, significant rotation of each piece is restricted by a step edge 16 formed on the lower support plate 14). At the time of torque measurement of the torque wrench using the adapter 23, the upright surface 21 of each piece 20 and the angular drive shaft of the torque wrench are in surface contact, so that pressure can be received or distributed in the surface direction. Therefore, even if the adapter component is precision casting (lost wax), which is relatively inexpensive, an adapter having excellent durability can be obtained.
[0023]
【The invention's effect】
As described above, according to the present invention, when this adapter is fitted to the measurement shaft provided in the torque wrench tester, the adapter portion protruding from the surface (upper surface) of the measurement shaft is supported on the upper side. Since it can be within the thickness dimension of a board, it can be set as a small adapter structure.
[0024]
In addition, when the adapter of the present invention is interposed between the measurement shaft of the torque wrench tester and the angular drive shaft of the torque wrench, the pressure receiving and configuration between the measurement shaft and the angular drive shaft are received by the surface. Since the pressure-receiving stress is dispersed in the surface direction, concentrated stress is not easily applied. Therefore, even a small adapter is excellent in durability.
[0025]
Furthermore, it is possible to produce a precision casting that is comparatively inexpensive as a component of the adapter, and because the configuration is simplified, it is possible to provide an adapter that is excellent in productivity and economy.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of an adapter according to the present invention.
2 is a cross-sectional view taken along the line II in FIG.
FIG. 3 is a cross-sectional view taken along the line in FIG.
FIG. 4 is a plan view of an upper support plate which is an adapter component of the present invention.
FIG. 5 is a cross-sectional view of an upper support plate that is an adapter component of the present invention.
FIG. 6 is a plan view of a lower support plate which is an adapter component of the present invention.
FIG. 7 is a cross-sectional view of a lower support plate that is an adapter component of the present invention.
FIG. 8 is a plan view of a piece that is an adapter component of the present invention.
FIG. 9 is a longitudinal sectional view of a piece that is an adapter component of the present invention.
FIG. 10 is a side view of a connecting pin that is an adapter component of the present invention.
FIG. 11 is an explanatory diagram when measuring torque of a torque wrench using a torque wrench tester.
FIG. 12 is an explanatory diagram showing a configuration of a conventional adapter.
[Explanation of symbols]
11 Upper support plate 12 Square hole 13 Shaft clamping hole 14 Lower support plate 15 Shaft clamping hole 16 Step edge 17 Swelling portion 18 Connecting pin 19 Small diameter step portion 20 Piece 21 Standing surface 22 Shaft insertion hole 23 Adapter 24 Back surface 5 Handle 5
6 Loading lever 7 Handle support 8 Handle 9 Adapter 1 Torque wrench tester 2 Measurement input shaft 3 Torque wrench 4 Drive shaft 5 Handle 6 Loading lever 7 Handle support 8 Handle 9 Adapter

Claims (1)

The outer periphery of the torque wrench tester is fitted in the square hole formed at the shaft end of the first shaft member so as not to rotate around the shaft , and the second shaft member of the torque wrench has the inner shaft at the inner shaft. An adapter that is non-rotatably fitted in the direction around the axis,
A lower support plate that can be inserted into the square hole;
An upper support plate formed with a hole through which the angular axis passes, and disposed opposite to the lower support plate;
A connecting pin that maintains a plurality of the upper support plate and the lower support plate that are arranged with a spacing in the direction around the axis; and
A plurality of columnar columnar members disposed between the upper and lower support plates with an interval in the direction around the axis;
Have
The columnar member has an outer peripheral portion formed on a mountain-shaped slope portion engaging with a corner portion of the square hole, and an inner peripheral portion formed on a flat surface corresponding to the flat surface of the angular axis . Adapter for wrench tester .

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