JPH04152070A - Marking device for torque wrench - Google Patents

Abstract

PURPOSE:To surely perform marking with a simple structure, by sticking the ink quantity optimum for the size of a bolt with its spraying to the head of the bolt, as the means which marks that a bolt fastening work is completed at a specified torque with the use of a torque wrench. CONSTITUTION:At the fastening time of a bolt W, the fastening torque is detected by a detection means, at the time when reaching the fastening torque specified on the bolt W in advance. The ink having become mist like in a constant quantity is sticked with its spraying to a bolt head Wa from an injection nozzle mechanism 11 provided in a socket 10, with the ink fed in a constant quantity from a cartridge type ink pot P and a compressed gas being mixed, by controlling the valve with its opening and closing of the hose connected to a compressed gas feeding source with the movement of this detection means. Thus, the optimum identification mark can be marked surely and yet in succession with good efficiency, on each head Wa of a lot of bolts W in various sizes having reached the specified torque.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a marking method for a torque wrench and an apparatus thereof, and more specifically, the tightening of a bolt is sometimes performed, and the pre-specified tightening of the bolt is determined by the torque. This invention relates to a marking device for a torque wrench that automatically sprays ink onto the head of a bolt to indicate that the bolt has reached a specified torque.

[Conventional technology]

Conventionally, in order to prevent unforeseen accidents caused by forgetting to tighten bolts or loosening them, the heads of bolts that have been tightened to the specified torque are colored with ink, etc., to distinguish between bolts that have reached the specified torque and other bolts. We aim to improve safety by identifying

By the way, various torque wrenches with markings have been proposed as means for coloring the heads of bolts that have reached the specified torque as described above.
Publication No. 2-130182 and JP-A-62-130182
The torque wrench with markings disclosed in the publication uses a stamp method that uses a small air cylinder. A sponge pad containing ink is installed at the tip of the cylinder, and the sponge pad applies ink to the bolt head when the specified torque has been reached. It is attached and colored.

[Problems to be Solved by the Invention] However, the above-mentioned torque wrench with markings using a sponge pad is a method in which a sponge pad containing ink is brought into contact with each bolt head and colored. Therefore, the coloring tends to vary and become unclear due to the force of pressing, etc., and there are problems such as the sponge pad being damaged and having to be replaced in a short period of time, or falling off, and furthermore, it requires a considerable amount of compressed gas. Moreover, there was a problem in that it took too much time to operate, making it impossible to work efficiently.

[Purpose of the invention]

This invention was devised by focusing on such conventional problems, and as a means of indicating that bolt tightening work has been completed with a specified torque using a torque wrench, the size of the bolt is marked on the head of the bolt. By spraying and adhering the optimum amount of ink to the surface, it is possible to perform marking reliably with a simple structure, and work can be performed continuously without the need to replace parts. By adopting an ink pot, it is possible to attach markings to the heads of a large number of bolts at the same time, and also to provide a marking device for a torque wrench that can perform work efficiently in a short time. This is the purpose.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a detection means on the arm portion of the torque wrench to detect when the specified tightening torque of the bolt is reached, and a detection means on the tip of the arm portion of the torque wrench. A socket that is perpendicular to the longitudinal direction of the bolt wrench and that fits into the head of the bolt is provided at the tip thereof, and an injection nozzle mechanism that sprays ink onto the bolt head is provided inside this socket, and the injection nozzle mechanism is placed on the rear end side of the injection nozzle mechanism. A holder is connected to the cartridge-type ink pot via an adapter, the holder comprising a pot storage chamber that accommodates a cartridge-type ink pot and an ink storage chamber that slidably accommodates a piston valve. Equipped with a communication hole for guiding ink from the ink to the ink storage chamber,
The piston valve housed in the ink storage chamber is always biased in the valve closing direction via a spring, and the inner wall of the ink storage chamber is moved up and down from the ink storage chamber to the chamber on the injection nozzle mechanism side. A supply hose connected to a compressed gas supply source is connected to the chamber on the side of the injection nozzle mechanism defined by the piston valve, and a supply hose is provided in the middle of this supply hose. The switching valve is controlled to open and close according to the command from the detection means when the tightening torque specified by the bolt is reached, and the piston valve is actuated by the compressed gas pressure, and ink is transferred from the ink storage chamber to the chamber on the side of the injection nozzle mechanism. The gist of this invention is to allow a certain amount of ink to flow out and be deposited on the top of the bottle by spraying a certain amount of ink using a jet nozzle mechanism using the compressed gas pressure.

[Operation of the Invention] The present invention is configured as described above, and the bolt is sometimes tightened, and when the pre-specified tightening torque for the bolt is reached, this tightening torque is detected by a detection means, By controlling the opening and closing of the valve of the hose connected to the compressed gas supply source by the movement of this detection means, a fixed amount of ink and compressed gas supplied from the cartridge type ink pot are mixed, and the injection nozzle installed in the socket is mixed. By spraying a certain amount of atomized ink from the mechanism onto the bolt heads and depositing them, it is possible to reliably place the optimal identification marks on the heads of many bolts of various sizes that have reached the specified torque. Furthermore, marking can be performed continuously and efficiently.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a torque wrench 1 showing a first embodiment of the present invention.
A sectional view of the marking device 2 attached to the torque wrench 1 is shown. A knurled grip 4 is integrally attached to the rear end of the arm portion 3 of the torque wrench 1, and the torque wrench 1 is attached to the tip side. The marking device 2 is attached in a direction perpendicular to the longitudinal direction of the marking device.

As shown in FIGS. 2 and 3, the arm portion 3 of the torque wrench 1 is provided with a detection means 6 (microswitch) for detecting when the specified tightening torque of the bolt W is reached; A toggle mechanism 7 composed of a leaf spring or the like that operates in conjunction with the detection means 6, and a valve 8 that operates when a predetermined torque is reached due to the movement of the detection means 6 are provided.
This valve 8 is connected to a compressed gas supply source (not shown) via a supply hose.

Note that the compressed gas is, for example, compressed air.

Freon gas or the like is used.

Next, as shown in FIGS. 1 and 4 to 10, the marking device 2 sprays atomized ink into a socket 10 having a recess 9 that fits into the head Wa of the bolt W. An injection nozzle mechanism 11 is provided to spray the bolt head Wa with the
On the rear end side of this injection nozzle 11, there is a pot storage chamber 13 that accommodates a cartridge-type ink pot P for storing ink, which is a colored paint, via an adapter 12 as shown in FIGS. A holder 16 is integrally provided which defines an ink storage chamber 15 that slidably accommodates a piston valve 14 as shown in FIGS. 7 and 8.

The pot storage chamber 13 has a threaded portion 17 on the holder 16.
A cover member 18 is attached which is detachably attached via the cartridge type ink pot P, and the cartridge-type ink pot P is attached by being inserted into the adapter 12 in an upside-down state.

As shown in FIGS. 9 and 10, the adapter 12 has a protruding blade 19 formed at its upper end to open the mouth of the cartridge-type ink pot P, and has a flow channel in its center that allows the ink to flow out. A hole 20 is formed therein, and the holder 16 is screwed into the upper end of a hollow cylindrical holder 16 in a watertight manner via a threaded portion 21 formed on the outer peripheral surface.

Further, the piston valve 14 accommodated in the ink storage chamber 15 is attached to a spring 22 as shown in FIGS. 7 and 8.
The upper chamber 15a of the ink chamber 15 defined by the piston valve 14 is always energized in the valve-closing direction (downward in FIG. 1) through the piston valve 14. A passage 23 is formed that communicates with the chamber 15b of the ejection nozzle mechanism 11, and the ink flowing into the upper chamber 15a of the ink storage chamber 15 is injected by communicating or blocking the passage 23 by raising and lowering the piston valve 14. It is configured to lead to the chamber 15b of the 11 nozzle mechanisms.

As shown in FIGS. 7 and 8, the upper end of the piston valve 14 is connected to the adapter 12 by a spring 22.
A concave portion 14a for holding the holder 16 is formed, and a convex portion 14 that engages with a concave portion 16a formed in the holder 16 is formed on the lower end side.
As shown in FIG. 8, this convex portion 14b is formed with a substantially triangular communication hole 24 whose opening area is variable when the piston valve 14 moves up and down.

By forming the opening area of the flow hole 24 into a substantially triangular shape, as shown in FIGS. 11 and 12, the amount of ink flowing out from the lift height H of the piston valve 14 is proportional to Depending on the size of the ink, the optimum amount of ink can be ejected and adhered.

A connection portion 25 of a supply hose (not shown) connected to the compressed gas supply source is formed on the side wall of the chamber 15b of the injection nozzle mechanism 11 that is partitioned by the piston valve 14, and a switching section provided in the middle of this supply hose is formed. valve 8,
The specified tightening of the bolt is controlled to open and close by a command from the detection means 6 when the torque is reached, and the piston valve 14 is actuated by the pressure of the compressed gas G, and the ink storage chamber 15 is tightened.
The ink flows out from the chamber 15a of the injection nozzle mechanism side to the chamber 15b of the injection nozzle mechanism side, and the compressed gas pressure causes the ink to flow out from the chamber 15a of the injection nozzle mechanism 1.
A certain amount of ink is applied to the bottle head W by the nozzle 11a of No. 1.
It is configured to be applied by spraying it onto a.

Next, the marking method of the present invention will be explained.

First, as shown in FIG. 1, the recess 9 formed in the socket 10 of the torque wrench 1 is fitted into the head Wa of the pole W to be tightened to a specified torque. Then, when tightening the revolver) W with the torque wrench 1, the bolt W
When the tightening torque reaches the specified torque, the detection means 6 moves the torque by a distance in conjunction with the movement of the toggle mechanism 7 inside the arm part 3, as shown in FIG. When this is detected, the valve 8 is actuated to open the passage between the air supply source and the connecting hose.

When the valve 8 is activated, the compressed gas passes through the supply hose to the ink storage chamber 150 of the marking device 2.
The gas pressure causes the piston valve 14 to move toward the adapter 12 against the elastic force of the spring 22.

Then, the passage 23, which had been closed by the piston valve 14, is opened, and the upper chamber 15a of the ink storage chamber 15 and the chamber 15b of the 11 ejection nozzle mechanisms are communicated with each other, and the ink flows from the cartridge-type ink pot P into the upper chamber 15a. The ink that has been stored in the chamber 15b is guided to the chamber 15b. The ink that has flowed into the upper chamber 15a is compressed by compressed gas from the air supply source.
The spray is ejected from the nozzle lla of the injection nozzle mechanism 11 through the communication hole 24 of the piston valve 14, and is injected onto the head Wa of the bolt W to mark it.

Furthermore, when the ink that has flowed into the upper chamber 15a passes through the flow hole 24 of the piston valve 14 as described above, the amount of ink is adjusted in proportion to the lift height H of the piston valve 14 as described above. A constant amount of ink is always injected onto the head Wa of the bolt W to form a marking, regardless of the size of the head Wa of the bolt W.

In addition, since the amount of ink can be measured continuously as long as it is stored in the cartridge-type Ink Bond P, work efficiency is good, and when the ink runs out, the cartridge-type Ink Bond P can be replaced or replaced. Alternatively, it is also possible to replenish ink into the cartridge-type ink pot P using a refill ink pot.

By repeating the above operations, it is possible to automatically and reliably continuously mark the head Wa of the bolt W that has reached the specified torque with ink.

Further, FIG. 13 shows a second embodiment of the present invention, and in this embodiment, the marking device 2 is attached to the top of the socket 10, whereas the marking device 2 is attached to the upper part of the socket 10 in the first embodiment. The nozzle 32 of the injection nozzle mechanism 31 attached to the upper part of the socket 10 and the ink outlet 3 of the marking device 2
3 are connected via a hose 34.

Note that the configuration of the marking device 2 is the same as that of the first embodiment, so the same reference numerals are given and the explanation will be omitted.

In the case of this second embodiment, when marking is performed by tightening the bolt W with a predetermined torque in a narrow space, etc., the marking device 2 does not get in the way and the work can be carried out easily.

〔Effect of the invention〕

This invention sprays and adheres an amount of ink optimal for the size of the bolt onto the head of the bolt as a means of indicating that bolt tightening work has been completed to a specified torque using a torque wrench as described above. This makes it possible to perform marking reliably with a simple structure, and allows continuous work without the need to replace parts. Also, by adopting a cartridge-type ink pot, marking can be done reliably with a simple structure. In addition to being able to attach ink to the heads of many bolts, it is extremely convenient to replace ink pots and refill ink, and the work can be done efficiently in a short time. 2 and 3 are cross-sectional views of a marking device attached to a torque wrench showing a first embodiment of the present invention.
The figure is a plan view of the detection means provided on the arm of the torque wrench and an explanatory diagram showing the operating state, FIG. 4 is a sectional view of a holder equipped with an injection nozzle mechanism, and FIG. 5 is a plan view of FIG. Fig. 6 is a plan view taken along the line VI-VI in Fig. 4, Fig. 7 is a cross-sectional view of the piston valve, Fig. 8 is an enlarged side view taken from the ■-■ arrow in Fig. 7, and Fig. 9 is a cross-section of the adapter. Figure 10 is a front view of the adapter, Figure 11 is the piston valve's circulation hole,
Fig. 12 is an explanatory diagram showing the relationship between the ink flow rate and the lift height of the piston valve in Fig. 11, and Fig. 13 is an explanatory diagram showing the relationship between the ink flow rate and the lift height of the piston valve in Fig. 11. FIG. 3 is a cross-sectional view of the marking device.

1...torque wrench, 2...marking device, 3.
... Arm portion, 6... Detection means, 8... Switching valve, 10... Socket, 11... Injection nozzle mechanism, 12... Adapter 13... Pot storage chamber, 1
4... Piston valve, 15... Ink storage chamber, 1
5a... Upper chamber, 15b... Chamber, 16... Holder 20... Distribution hole, 22... Spring, 23...
・Passway, W...Bolt, Wa...Head.

Agent: Patent Attorney Nobuo Kogawa -

Claims (1)

[Claims] The arm of the torque wrench is provided with a detection means that detects when the tightening torque specified for the bolt is reached, and the arm of the torque wrench is provided with a detection means that is perpendicular to the longitudinal direction of the torque wrench and has a bolt at the tip. A socket that fits with the head of the bolt is provided, an injection nozzle mechanism for spraying ink onto the bolt head is provided inside the socket, and a cartridge type ink pot is housed at the rear end of the injection nozzle mechanism via an adapter. A holder is connected to the holder, which is formed by partitioning a pot accommodating chamber for accommodating a cartridge type ink pot, and an ink accommodating chamber for slidably accommodating a piston valve. The piston valve housed in the ink storage chamber is normally biased in the valve closing direction via a spring, and an ejecting nozzle mechanism is formed on the inner wall surface of the ink storage chamber from the ink storage chamber by the vertical movement of the piston valve. A supply hose connected to a compressed gas supply source is connected to the injection nozzle mechanism side chamber defined by the piston valve, which forms a passage for supplying or blocking ink to the side chamber. When the tightening torque specified for the bolt is reached, the switching valve provided on the bolt is controlled to open and close based on the command from the detection means, and the piston valve is actuated by the compressed gas pressure, so that the ink is transferred from the ink storage chamber to the chamber on the side of the injection nozzle mechanism. 1. A marking device for a torque wrench, characterized in that the marking device for a torque wrench is configured to cause ink to flow out and, using the compressed gas pressure, a jet nozzle mechanism sprays a certain amount of ink onto the head of the bottle.