JP2002096272A - Adapter for torque wrench tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter for a torque wrench tester which is compact, and capable of improving the manufacturing economy and easily and reliably fitting and locking torque wrench square drive shafts of various kinds of sizes to a measurement input shaft of a predetermined size disposed on the torque wrench tester. SOLUTION: This adapter comprises a lower supporting plate, an upper supporting plate which is parallel to the lower supporting plate and located separately above the lower supporting plate, and has a square hole in a center part thereof, a plurality of connection pins which are disposed parallel to each other at equal intervals in the peripheral direction of the lower and upper supporting plates to separately hold the lower and upper supporting plates, and a plurality of pieces which are pivotably supported with each connection pin as a supporting shaft and have an erection surface for holding the square hole in a cooperative manner with each other and a back surface forming isosceles sides of 45 deg. across the erection surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque input shaft provided on a torque wrench tester, in which a square drive shaft of a torque wrench whose set torque is to be measured is fitted and locked, and the torque of the torque wrench is reduced. An adapter used to transmit the torque to the torque wrench tester, especially the adapter has a small configuration and enhances manufacturing economy, and furthermore, for a fixed size measurement input shaft provided in the torque wrench tester, The present invention relates to a torque wrench tester adapter capable of easily and surely fitting and locking torque wrench angle drive shafts of various sizes.

[0002]

2. Description of the Related Art For example, in order to measure (verify) torque characteristics (torque value) of a torque wrench with a ratchet, for example, as shown in FIG. 11, a square hole axis perpendicular to a horizontal plane of a torque wrench tester 1 is used. Measurement input shaft 2 having
A square drive shaft 4 of a torque wrench 3 with a ratchet to be measured is fitted therein, and a handle 5 of the torque wrench 3 with a ratchet is measured by a handle support 7 engaged with a loading lever 6. The horizontal position of the torque wrench 3 with the ratchet to be held is held, and the position is regulated such that the axis of the torque wrench tester measurement input shaft 2 and the axis of the angular drive shaft of the torque wrench 3 with the ratchet 3 coincide. In this state, the handle 8 is driven (rotated) to apply a rotational load to the handle 5 of the torque wrench 3 with a ratchet.
This is for detecting the torque value or detecting the accuracy of the display scale at the time of operation of the toggle link provided inside.

However, since the shape and size (inner diameter) of the square-shaped measurement input shaft 2 provided in the torque wrench tester 1 are constant, the inner diameter of the measurement input shaft 2 of the torque wrench tester 1 is constant. The shape and size of the square drive shaft 4 of the torque wrench with a ratchet that matches (matches) the shape and size of the square drive shaft 4 are determined. It was impossible to check the torque of the torque wrench with a ratchet.

Therefore, conventionally, in order to perform a torque check of torque wrenches with ratchets of various sizes, it is necessary to prepare a plurality of types of torque wrench testers 1 each having a measurement input shaft 2 adapted to each square drive shaft. As a result, there was a problem in terms of equipment economy.

Conventionally, a torque wrench tester 1 is provided on a torque wrench tester 1 as shown in FIG. 12, for example, in order to make it possible to check the torque of various torque wrenches with a ratchet using a single type of torque wrench tester. A square shaft 9A fitted into the square hole 2A of the measurement input shaft 2 and a head 9B integral with the square drive shaft of a torque wrench with a predetermined ratchet to be torque-measured are fitted and locked to the head 9B. An adapter 9 having a stop hole 9C is prepared.
If the outer diameter of the square drive shaft of the torque wrench with the ratchet to be subjected to torque measurement by using this adapter 9 is smaller than the inner diameter of the measurement input shaft 2 provided in the torque wrench tester, use the adapter 9 described above. In some cases, the square drive shaft of the torque wrench with a ratchet can be engaged with the measurement input shaft 2 of the torque wrench tester.

[0006]

However, when such an adapter 9 is formed, if the dimensional difference between the inner diameter of the fitting engagement hole 9C and the outer diameter of the square shaft 9A is large, the adapter 9 is not provided. Since the fitting engagement hole 9C can be formed inside the axis of the square shaft 9A, it is not necessary to provide the head 9B.
The inner diameter of the fitting engagement hole 9C is set to be, for example, 2 times smaller than the outer diameter of the square shaft 9A.
If an attempt is made to form a fitting and locking hole 9C having a size that does not differ by about mm, the thickness between the inner diameter of the fitting and locking hole 9C and the outer diameter of the square shaft 9A becomes 1 mm, and the thinner adapter is used. And the strength of the adapter is insufficient.

Therefore, in such a case, the head 9B is
A is formed integrally therewith, and a fitting locking hole 9C is formed on the inner axis of the head 9B.
The height H1 of the head 9B for forming the C must be ensured, which not only increases the size of the adapter 9 and causes inconvenience in handling, but also the height of the head 9B. For an adapter with a large coarse H1, the adapter 9
Is used between the measurement input shaft 2 of the torque wrench tester 1 and the square drive shaft of the torque wrench with a ratchet, as described above, the shaft of the handle 5 of the torque wrench 3 with the ratchet is If the position adjustment is neglected, a high-precision torque measurement becomes impossible if the position adjustment is not performed.

The present invention has been made in view of such a conventional problem. A square drive of various torque wrenches having different thicknesses of a square drive shaft for a square hole of a model input shaft of a torque wrench tester. An adapter capable of fitting and locking a shaft. Further, the adapter does not have a configuration capable of suppressing an increase in size, improving handling efficiency of the adapter, and improving easiness and economy of manufacture. ,
Another object of the present invention is to provide an adapter for a torque wrench tester that has sufficient strength as an adapter and has excellent durability.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a torque wrench tester having a square hole formed in a measurement input shaft and a corner of a torque wrench to be torque-measured. An adapter interposed between the drive shaft and the drive shaft, the adapter being a lower support plate corresponding to a bottom surface in a measurement input shaft of the torque wrench tester, and a lower support plate parallel to the lower support plate. An upper support plate spaced above the side support plate and having a square hole formed in the center thereof; and the lower support plate and the upper support plate arranged in parallel with each other at equal circumferential positions of the lower support plate. A plurality of connecting pins for separating and maintaining the side support plate and the upper support plate, an upright surface which is pivotally supported by the respective connecting pins and cooperates with each other to hold a square hole, and sandwiches the upright surface; Multiple with 45 degree isosceles back It is characterized in that a torque wrench tester adapter constituted by the frame.

Therefore, according to the adapter of the present invention, it is possible to constitute a small-sized adapter capable of suppressing the amount of protrusion of the torque wrench tester from the upper end surface of the measurement input shaft, and furthermore, to provide a torque tester. Since the measured load at the time is mainly changed by the surface pressure received by each piece, even if the adapter is small, it has sufficient torque transmission strength. In addition, the adapter having the above configuration has a simplified configuration and good assembling workability.
It can be formed by precision casting (lost wax).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings.

FIGS. 1 to 3 show a completed adapter, and FIGS. 4 to 10 show components of the adapter.

In FIGS. 4 to 10, reference numeral 11 denotes an upper support plate, and a square hole 12 through which a square drive shaft (not shown) of a torque wrench can be inserted is provided in the center of the upper support plate 11. Are formed, and four shaft caulking holes 13 are further formed corresponding to the intermediate position of each side of the square hole 12.

Reference numeral 14 denotes a lower support plate. 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 2 shown in FIG. It is formed in a square parallel to the bottom surface, and a shaft crimping hole 15 similar to the shaft crimping hole 13 provided in the upper support plate 11 is formed in each corner of the square.

The dimension R 'between the drilling position of each shaft tightening hole 15 drilled in the lower support plate 14 and the center point P' of the lower support plate 14 is defined in the upper support plate 11. Each shaft caulking hole 1
3 and the dimension R between the center point P of the upper support plate 11 thereof. Further, a raised portion 17 for forming a step edge 16 is integrally formed at the center of the upper surface of the lower support plate 11.

Numeral 18 denotes four connecting pins for keeping the upper supporting plate 11 and the lower supporting plate 14 vertically separated from each other, and upper and lower ends of the connecting pins 18 are connected to the upper and lower ends. A small-diameter step portion 19 is formed so as to be press-fitted into shaft tightening holes 13 and 15 formed in the support plate 11 and the lower support plate 14.

20 is an upper support plate 11 and a lower support plate 14
8 and 9, each piece 20 has a vertical upright surface 21 and a vertical upright surface 21 as shown in FIGS. A shaft insertion hole 22 through which the connection pin 18 passes is parallel to the surface 21.
And a pair of back surfaces 2 inclined at 45 degrees with respect to the upright surface 21
4 is formed in an isosceles triangular prism shape.
A corner formed by the upright surface 21 and the upper surface A of each of the pieces 20 is formed in a corner radius B for facilitating insertion work of a square drive shaft or another adapter.
A chamfer E for facilitating the work of inserting the adapter into the measurement input shaft or another adapter is formed at a corner where the lower surface C and the rear surface D of the zero exist.

The components used to construct the adapter have been described above, and these components are formed by precision casting (lost wax). Next, the assembling of the adapter by these constituent members will be described. First, each connecting pin 18 is passed through and held in the shaft insertion hole 22 of each of the four pieces 20, and the lower ends of the connecting pins 18 are connected to the lower side. Each shaft caulking hole 15 formed in the support plate 14
And the upper ends of the connection pins 18 are fitted into the respective shaft tightening holes 13 formed in the upper support plate 11, and the lower ends of the connection pins 18 are connected to the lower support plate 14.
Also, the upper end of the connecting pin 18 is crimped to the upper support plate 11 so that the adapter 23 as shown in FIGS.
Is configured.

In the adapter 23 thus configured, a square hole surrounded by the upright surfaces 21 of the four pieces 20 and a corner back surface 24 of the pieces 20 are held by a prism formed in cooperation. The prism surface (rear surface) 24 can be fitted and held in the shaft hole 2A of the measurement input shaft 2 provided in the torque wrench tester.

Then, when a square drive shaft of a torque wrench for which torque is to be measured is inserted into the square hole of the adapter 23, the torque wrench square drive shaft is connected to the adapter 2
3 A shaft hole 2A of the measurement input shaft of the torque wrench tester through
It can be connected in the inner to the rotating direction.

Of course, since the shaft diameter (outer diameter) of the torque wrench angle drive shaft and the inner diameter of the measurement input shaft hole of the torque wrench tester are various, adapters 23 of various sizes which can be adapted to the shaft diameter and inner diameter are used. When the 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 is large, it is necessary to prepare in advance. By using a plurality of adapters 23 in combination, that is, by combining a small adapter fitted and held in the square hole of the large adapter, the shaft diameter of the torque wrench drive shaft to be measured is small. However, the torque can be easily measured with the same torque wrench tester.

In the adapter 23 having the above structure,
Each piece 20 constituting the adapter is connected to each connecting pin 18.
As a result, as shown in FIG. 3, it is pivotally supported about the connecting pin 18 as an axis.
As shown in FIG. 3, a large rotation of each piece is restricted by a step edge 16 formed on the lower support plate 14. For this reason, when measuring the torque of the torque wrench using the adapter 23, the upright surface 21 of each piece 20 is measured.
And the angular drive shaft of the torque wrench is in surface contact, so that the pressure reception can be dispersed in the surface direction. Therefore, even if the adapter component is a relatively inexpensive precision casting (lost wax), an adapter with excellent durability can be obtained.

[0023]

As described above, according to the torque wrench tester adapter of the first aspect of the present invention, when this adapter is used by fitting it to the measuring shaft provided on the torque wrench tester, The adapter portion protruding from the surface (upper surface) of the measurement shaft can be set within the thickness of the upper support plate, so that a small-sized adapter configuration can be realized.

Further, the adapter of the present invention interposed between the measuring shaft of the torque wrench tester and the angular drive shaft of the torque wrench can receive the pressure between the measuring shaft and the angular drive shaft and receive the form by a surface. As a result, since the pressure receiving stress is dispersed in the plane direction, concentrated stress is less likely to be applied, so that even a small-sized adapter is excellent in durability.

Furthermore, it is possible to manufacture a precision casting which is relatively inexpensive for the components of the adapter, and to simplify the configuration, thereby providing an adapter which is excellent in productivity and economy. Become.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an adapter according to the present invention.

FIG. 2 is a sectional view taken along the line II in FIG.

FIG. 3 is a sectional view taken along a roll line in FIG. 2;

FIG. 4 is a plan view of an upper support plate as an adapter component of the present invention.

FIG. 5 is a sectional view of an upper support plate which is a component of the adapter 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 a component of the adapter of the present invention.

FIG. 9 is a longitudinal sectional view of a piece which is a component of the adapter of the present invention.

FIG. 10 is a side view of a connecting pin which is an adapter component of the present invention.

FIG. 11 is an explanatory diagram when a torque of a torque wrench is measured by a torque wrench tester.

FIG. 12 is an explanatory diagram showing a configuration of a conventional adapter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Upper support plate 12 Square hole 13 Shaft caulking hole 14 Lower support plate 15 Shaft caulking hole 16 Step edge 17 Crest portion 18 Connecting pin 19 Small diameter stepped 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)

[Claims] 1. An adapter interposed between a square hole formed in a measurement input shaft of a torque wrench tester and a square drive shaft of a torque wrench to be subjected to torque measurement, wherein the adapter is a torque wrench. A lower support plate corresponding to the bottom surface in the measurement input shaft of the tester, and a square hole is formed in the center of the lower support plate in parallel with the lower support plate and spaced above the lower support plate. An upper support plate, and a plurality of connection pins that are arranged in parallel with each other at equal circumferential positions of the lower support plate and the upper support plate to maintain the lower support plate and the upper support plate apart from each other, It is composed of a plurality of pieces which are supported by the respective connection pins as support shafts and cooperate with each other to hold a square hole, and a back surface which is an isosceles of 45 degrees across the upright surface. Adapter for torque wrench tester .