JPS6237643Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tightening device suitable for tightening nuts and the like.

2. Description of the Related Art As a device for tightening bolts and nuts that connect various flanges and metal fittings, it is generally known that a socket that fits into a bolt head or nut is attached to the tip of an electric motor's rotating shaft. The above device is capable of tightening bolts and nuts simply by aligning the axis of the motor with the axis of the bolt, fitting the head of the bolt or nut into the socket, and turning on the motor.

However, when using the above-mentioned device to bolt flanges or metal fittings installed on the ceiling or floor of a tunnel or passageway with a low ceiling (such as a tunnel with a ceiling high enough for a person to bend down to pass through). The problem is that it is necessary to move the equipment away from the ceiling or floor by the length of the motor shaft, but if you support the equipment while working in this state, your working posture becomes extremely cramped and the work becomes complicated. It was hot.

Therefore, in Utility Application No. 56-55119, the present applicant previously proposed a method in which a rotary shaft equipped with a socket for fitting a nut etc. was attached to a support plate so as to be rotatable and with both ends of the rotary shaft facing the side surface of the support plate. By devising a tightening device such as a nut in which the support plate is provided with a drive mechanism for rotating the rotating shaft, labor-saving work for bolting in the narrow tunnels and passages has been achieved.

However, when the above-mentioned bolt tightening work requires the tightening of many types of bolts and nuts of different sizes and shapes, when the above-mentioned device is used, the bolts and nuts are tightened.
Depending on the size and shape of the nut, it is necessary to replace the above-mentioned device with sockets of different sizes and shapes, which reduces the workability of bolting.

This idea was made to solve this problem, and allows bolts and nuts of various sizes and shapes to be rotated by simply changing the sockets for bolting flanges and metal fittings in tunnels with low ceilings and passageways. The object is to provide a tightening device that can be tightened.

This invention will be explained below with reference to the drawings.

Figures 1 and 2 show an embodiment of this invention, and the reference numeral 1 in the figures indicates a rotating cylindrical body having an engaging hole 1a with square openings of the same size on both sides. It is the axis. Teeth 1b are provided around the center of the outer circumference of the rotating shaft 1, and the rotating shaft 1 has the following teeth:
One end of the spanner arm 3 formed by integrating a pair of arm members 3a and 3b with a rivet 3c is attached to the tooth 1b.
It is rotatably attached around the axis of the rotating shaft 1 with... sandwiched between them. Furthermore, this rotating shaft 1 is connected to a pair of support plates 4 that are arranged on both sides of the spanner arm 3 (on both sides of the rotating box 1 in the axial direction), that is, arranged so that the spanner arm 3 is located in the middle as shown. . I support it. Further, a swinging arm 6 having a claw 6a that engages with the teeth 1b to regulate the rotational direction of the rotating shaft 1 is attached to the spanner arm 3 so as to be swingable by a pin 7. The rear end 6c of 6 is
A well-known device that is engaged with the tip of a stopper 10 that is inserted into a hole 8 formed in the axial direction of the spanner arm 3 via a spring 9 so as to be freely retractable, thereby regulating the direction of rotation of the rotating shaft 1. A ratchet mechanism is formed.

On the other hand, between the support plates 4 and 5, a pair of hydraulic cylinders 1, which also serve as handles, are located at mutually opposing positions in a direction perpendicular to the spanner arm 3 and on both sides of the spanner arm 3 in the rotating direction.
1 and 12 are respectively attached by fasteners 13..., and these hydraulic cylinders 11,
The tips of each of the twelve rods 11a, 12a are connected via a bearing member 14 in a state where they face each other. The bearing member 14 is fitted between the free ends of the pair of arm members 3a and 3b forming the spanner arm 3, and connects square holes 15, 15 for connection formed in these free ends to the bearing member 14. It is connected to the spanner arm 3 by a pivot 16 inserted through the hole 14a. In other words, the drive mechanism is composed mainly of the ratchet mechanism and the hydraulic cylinders 11 and 12.

The above-mentioned hydraulic cylinders 11 and 12 are each connected to a control device (both not shown) such as a power unit via a flexible oil pipe.
An on/off switch 18 provided on a handle 17 attached to the support plates 4, 5 is electrically connected to this control device. By operating this switch 18, an on/off signal is output to the control device, and based on this output, pressure oil is sent to drive the hydraulic cylinders 11 and 12.

On the other hand, four through holes 1f having the same diameter are formed at 90° intervals in each of the peripheral walls 1d and 1e near the openings on both sides of the rotating shaft 1. In the opening of the engagement hole 1a on the bearing 4a side, there is a cap-shaped socket 20 formed on one side with an opening hole 20a into which a nut or the like is fitted, and on the other side (bottom outer surface side) of the socket 20. The prismatic protrusion 20b formed in the above is fitted into one opening of the engagement hole 1a, and the mounting pin 21 is inserted into the attachment hole 20c formed at the base of the protrusion 20b and the pair of insertion holes 1f, 1f. is installed by inserting it. In addition, the bearing 4a has
The receiving cylinder 22 is fitted with a bolt-shaped fixing member 23 screwed into a screw hole at the end of its outer peripheral wall in contact with the outer periphery of the bearing 4a, and the outer peripheral wall covers the socket 20. Furthermore, a reaction force receiver 22a is provided protruding from the outer peripheral wall of the receiver tube 22. 2 is a second socket in which an opening hole 24a smaller than the opening hole 20a of the first socket 20 is formed, and this second socket 24 is approximately the same as the first socket 20. It has a shape that allows it to be attached to the rotating shaft 1 in the same manner as the first socket 20 using the convex portion 24b and attachment hole 20c.

The device configured as described above can be used to tighten bolts and nuts on flanges and metal fittings installed on ceilings and floors in narrow tunnels and passageways (tunnels with ceilings high enough for people to bend down to pass through). To turn the bolt, first fit the opening hole 20a of the socket 20 at one end of the support frames 4, 5 into the nut (or the head of the bolt) and turn on the switch 18.
When the switch 18 is turned on, the control device alternately sends pressure oil to the hydraulic cylinders 11 and 12 via the oil pipe, which causes the rods 11a and 12a to
move back and forth in conjunction. When the rods 11a and 12a reciprocate, the spanner arm 3 reciprocates around the rotating shaft 1, and as a result of this rotation, the rotating shaft 1 is intermittently rotated around its axis by the swinging arm 6. As a result, the socket 20 is turned with a nut, and the flanges and fittings are bolted.

On the other hand, when turning the nut in the opposite direction to the above,
First, rotate the fixing member 23 to loosen it, and then
Remove the receiving tube 22 from the
is pulled out from the insertion hole 1f and the attachment hole 20c, and the socket 20 is removed from the opening of the engagement hole 1a on the bearing 4a side. Then, the convex portion 20b of the socket 20
into the opening of the engagement hole 1a on the bearing 5a side,
The mounting pin 21 is inserted into the insertion hole 1f and the mounting hole 20c, and the receiving cylinder 22 is fitted into the bearing 5a, and the receiving cylinder 22 is fixed to the bearing 5a by the fixing member 23. Then, in the same manner as above, switch 18 is turned on to rotate socket 20 and turn the nut. At this time, since the socket 20 rotates in the opposite direction to the above, the nut can be turned in the opposite direction. In addition, as mentioned above, connect socket 2 to the nut, etc.
0, the axis of the bolt and the support plates 4, 5 are orthogonal, so the support plates 4, 5 can be supported in a comfortable posture even during tightening work in tunnels etc. where the work space in the direction of the bolt axis is narrow. can.

By the way, during nut tightening work, a considerable reaction force acts on the support plates 4 and 5 due to the frictional force generated in the nut. By bringing the reaction force into contact with the reaction force receiver 22a, the reaction force can be received by the reaction force receiver 22a.

Incidentally, in order to rotate a bolt head or nut having a size smaller than the opening hole 20a of the socket 20, the second socket 24 may be attached to the rotating shaft 1 and the same operation as above may be performed. In addition to the sockets listed above, we have prepared a wide variety of sockets with opening holes (not shown) of various shapes and sizes, so that you can choose the shape or size of the bolt head or nut you are using. Replace and use as appropriate. This allows bolts and nuts of various shapes or sizes to be rotated simply by changing the socket.

Further, the rotating box can be rotated by forming the claw 6a at the tip of the swinging arm 6 into a bifurcated shape and having one tip of the tip locked with the tooth 1b and the other case of locking the tip of the other tip with the tooth 1b. It is also possible to configure so that the rotation direction of 1 changes.

As explained above, in this invention, a rotating shaft equipped with a socket that fits into a nut, etc. is rotatably attached to one end of a support plate, and one end of a spanner arm is rotatable around the rotating shaft. A nut or the like is attached freely to the support plate, and the support plate is provided with a drive mechanism consisting of a hydraulic cylinder that is provided at the other end of the spanner arm in a direction perpendicular thereto, and that rotates the rotation shaft. In the tightening device, the rotary shaft is attached to the support plate with both ends disposed on both sides of the support plate, and the socket is selectively detachably attached to both ends of the rotary shaft, so that the socket can be replaced. Since the rotary shaft can be connected to the heads of nuts and bolts of various sizes, it is possible to tighten bolts and nuts of various shapes and sizes. Therefore, it is possible to easily and quickly turn and tighten various bolts and nuts of different sizes and shapes in a narrow tunnel or the like where the working space in the bolt axial direction is small by simply and quickly changing the socket. Furthermore, the drive mechanism uses a hydraulic cylinder to reciprocate the spanner arm around the rotation axis, that is, it combines the principles of a hydraulic cylinder and a lever, so the device can simply be held. It is possible to generate a large tightening torque with only a single bolt, and it can also handle bolts with a large tightening torque value.
The device can be made smaller and lighter, and its operability can be improved. Furthermore, since the hydraulic cylinder can be used as a handle, the device can be reliably held and subjected to reaction force, and tightening work can be performed reliably even in a narrow place with a small work space.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of an embodiment of the device of this invention, and FIG. 2 is a sectional view of the main part of the same embodiment. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 1a... Engagement hole, 4, 5... Support plate, 1d, 1e... Peripheral wall, 20... First
Socket, 20a... Opening hole, 24... Second socket, 24a... Opening hole, 24b... Convex portion.

Claims (1)

[Scope of utility model registration request] A rotating shaft 1 equipped with a socket 20 that fits into a nut or the like is rotatably attached to one end of the support plates 4 and 5, and one end of a spanner arm 3 is rotatably mounted around the rotating shaft 1. A drive mechanism is attached to the support plates 4 and 5 in a direction perpendicular to the other end of the spanner arm 3, and includes hydraulic cylinders 11 and 12 for rotationally driving the rotation shaft 1. The rotating shaft 1 is attached to the supporting plates 4, 5 with both ends disposed on both sides of the supporting plates 4, 5, and the socket 20 is attached to the rotating shaft 1. A tightening device for a nut, etc., characterized in that it is configured to be selectively attachable and detachable at both ends.