JPS6233478Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wire tensioner used for tensioning electric wires and the like.

As shown in Fig. 4, the conventional wire tensioner has a handle a.
A main body frame b is provided with a winding cylinder c that is linked to the handle a and a sling end fixing device d, while a movable pulley f is provided on the movable frame e, and one end is attached to the sling end fixing device d. It is constructed by suspending a tether g, the other end of which is fixed to the winding drum c, around a movable pulley f, and then wrapping it around the winding drum c. For example, as shown in FIG. 4, this wire tensioner has a hook h attached to a main body frame
are used by hooking covered wires such as electric wires k to hooks j attached to a moving frame e. According to this wire tensioner, by operating the handle a, the tension wire g can be wound around the winding drum c, the movable frame e can be pulled toward the main body frame b, and the covered wire k can be stretched. . At this time, if the force that pulls the stretched wire k is F, then a stress of 1/2 F will act on each of the two tension wire portions g1 and g2 of the strut g.

Therefore, when the force F that pulls the covered wire k increases, the stress acting on the strut g increases in proportion to this, and in order to withstand this, it is necessary to increase the tensile strength of the strut g. , the diameter of the tread g must be increased.

Incidentally, in recent years, there has been an increase in demand for wire tensioners that can take a large tensile force F, and in order to cope with this demand, if a wire g with a large tensile strength is used, the weight of the wire g increases and the winding body c The dimensions of the wire tensioner and the movable pulley f also increase, which increases the weight of the entire device, which causes the problem that it becomes inconvenient to operate and handle the wire tensioner, which is mainly used for work at high places. Another problem is that the manufacturing cost increases at a much higher rate than the rate of increase of the tensile force F. Furthermore, when the tensile force F increases, there is also the problem that the operation of the handle a becomes difficult.

The present invention aims to solve the problems of the above-mentioned conventional example all at once.
A winding cylinder 3 that interlocks with the handle 1 is provided, and a fixed pulley 4 is provided, while a movable frame 6 equipped with a movable pulley 5 is provided with a sling end fixing device 7. The tension strip 9 with the tip 8 fixed thereto is suspended around the fixed pulley 4 and the movable pulley 5 in this order, and then wrapped around the winding drum 3, and the rear end 10 is fixed on the winding drum 3. The present invention is characterized in that a wire tensioning device is configured.

In the illustrated example, a ratchet mechanism consisting of a switching claw 13 and a ratchet wheel 14 is disposed at the base of the handle 1, and when the switching claw 13 is set in the winding direction, the reciprocating rotation of the handle 1 is controlled. Only the rotation in one direction is transmitted to the winding drum 3, so that the tension strip 9 can be wound onto the winding drum 3, and the handle 1 is configured to rotate freely in the other direction. Also, a brake wheel 1 is installed between the handle 1 and the winding drum 3.
1 and a claw 12 are arranged to ensure safety. Since these mechanisms belong to well-known techniques, detailed explanations will be omitted. In this embodiment, no speed reduction device is interposed between the handle 1 and the winding drum 3.

It is preferable to use a wire rope as the tether 9, but the present invention is not limited thereto. The distal end 8 of this tread 9 is formed into a ring shape and is fixed to a tread end fixture 7 made of a shaft attached to the movable frame 6. The rear end 10 of the thread 9 is introduced into the winding drum 3 through a hole 15, where it is tied into a loop and fixed to the winding drum 3. This drag 9 is
As shown in FIG. 3, a fixed pulley 4 rotatably supported on a shaft 16 fixed to the main body frame 2 and a movable pulley 5 rotatably supported on a shaft 17 fixed to the movable frame 6 are suspended in this order. It is wound around the winding cylinder 3.

A hook 1 is attached to the main body frame 2 via a connector 18.
9, and hooks 21 are attached to the moving frame 6 via connectors 20, respectively. In addition, 22 is the main body frame 2
This is a position regulating plate for the tread 9 attached to the.

Next, the operation of the present invention will be explained. If the device of the present invention is used, for example, as shown in FIG. Then, by operating the handle 1, a tension line 9 is applied to the winding drum 3.
By winding up the movable frame 6 and drawing it toward the main body frame 2, the covering line k can be stretched.

At this time, if the force that pulls the stretched line k is F, then three tension strips 9 are stretched in a substantially parallel state between the main body frame 2 and the movable frame 6, and the tensile force F is The parts 9a, 9b, 9c of the strut 9 are dispersed.
A stress of 1/3F will act on each of them.

Therefore, while the conventional tread 9 requires a tensile strength of 1/2F, the tread 9 of the present invention only needs a tensile strength of 1/3F, so a thinner tread 9 is used. can do. Therefore, the cross-sectional area and weight can be reduced to 2/3 of the conventional tension strip 9, and in connection with this, the winding drum 3, movable pulley 5, main body frame 2, movable frame 6, etc. can be made smaller and lighter. can.

Moreover, the force required to operate the handle 1 is reduced to 2/3 compared to the conventional one, and the handle 1 can be operated easily.

Since the present invention has the above configuration, the following effects can be achieved.

The cross-sectional area and weight of the tread can be reduced to 2/3 of the conventional one, and other related parts can also be made smaller, making the entire device lighter and smaller, making it convenient for handling and work at heights. It is.

Since the cross-sectional area of the strut can be reduced, costs can be reduced.

The handle can be operated easily. Further, as shown in the above embodiments, it is easy to configure a structure in which a speed reduction device is not interposed between the handle and the winding cylinder, and the structure can often be simplified from this point of view.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view taken along the line -- in FIG. 1, and FIG. 4 is a principle diagram of a conventional example. DESCRIPTION OF SYMBOLS 1... Handle, 2... Main body frame, 3... Winding cylinder, 4... Fixed pulley, 5... Moving pulley, 6... Moving frame, 7... Trap end fixing device, 8... Tip, 9... traction, 10... rear end.

Claims (1)

[Scope of utility model registration request] A main body frame equipped with a handle is provided with a winding cylinder that interlocks with the handle and a fixed pulley is provided, while a movable frame equipped with a movable pulley is provided with a sling end fixing device, and the sling end fixing device is provided with a sling end fixing device. The tread with the tip fixed,
A wire tensioning device characterized in that, after the fixed pulley and the movable pulley are suspended in this order, the wire is wound around the winding drum, and the rear end is fixed to the winding drum.