JPH03589Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field The invention relates to a rope tensioner, and is used for example in building construction, power transmission line construction, civil engineering, bridge construction, shipbuilding work, roof work of general house construction, painting work, etc. It is used as a tensioner for the main rope, which is stretched horizontally to ensure safety.

Conventional technology Conventionally, this type of rope tensioner was developed using the
Structures shown in Japanese Utility Model Application Publication No. 45713, Japanese Utility Model Application Publication No. 55-112144, and Japanese Utility Model Application Publication No. 59-14648 are known.

Problems to be Solved by the Invention Conventional rope tensioners have the drawbacks of not only increasing the number of man-hours required to connect both side plates, but also increasing weight and cost. In addition, both side plates are made of flat plates, which has the disadvantage of increasing the contact friction surface of the pulley.In addition, the plates must be thick to provide the necessary strength, which increases weight and costs. There was a drawback. Furthermore, the lock release lever is disposed on the check lever side, which does not provide a large leverage ratio and must be constructed from a strong member, which has the disadvantage of being expensive.

Means for Solving the Problems The present invention was proposed in view of the above-mentioned drawbacks of the conventional rope tensioner. A pulley is rotatably supported through the pulley, and the distal end is pivotally mounted between both side plates at a position where it can circumscribe the pulley, and a locking pawl in the form of uneven teeth is provided on the circumferential surface of the distal end to the pulley. a check lever whose rear end can be locked to one fixed member of the rope tensioning point; and a check lever installed between both side plates at a position approximately symmetrical to the pivotal position of the check lever with respect to the pulley. The rope guide member has a lock release lever attached to a part of both side plates for releasing the lock of the rope by the non-return lever, and one end is capable of being locked to the other fixed member at the rope tensioning point. , the other end is a free end, and the rope is stretched around the outer circumferential surface of the pulley in a substantially U-shape through a gap between a check lever and a rope guide member, with both side plates attached. The pulley shaft in the center, the pivot of the check lever at one end, and the rope guide member at the other end are connected only by three shaft rods, and there is a shaft in the center of both side plates that corresponds approximately to the outer diameter of the pulley. An embossed part in the shape of an arcuate groove is formed to protrude inwardly and in contact with the lock release lever, and the lock release lever is connected to both side plates at the attachment position of the rope guide member.

Function: It is only necessary to connect both side plates at three points: the center and both ends. In particular, the central part is used for mounting a pulley, and both ends are also used for pivotally mounting a check lever and a rope guide member, respectively, thereby reducing the number of man-hours required for connection.

In addition, the embossed portion reduces the contact friction surface of the pulley, reduces axial inclination of the pulley, and improves the strength of both side plates.

Further, since the distance between the fulcrum and the point of force of the lock release lever is at both ends in the longitudinal direction of both side plates, and the lever ratio is maximized, the lock can be released with a small operating force.

Embodiment Fig. 1 is a side view of the device of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is an exploded perspective view. In these figures, 1 and 1 are a pair of side plates, and 2 is a Pulley, 3 is the shaft of the pulley, 4 is the check lever, 5 is the pivot of the check lever, 6 is the rope guide member, 7 is the lock release lever, 8 is the rope, 9 and 10 are the fixing members, 11 and 12 are the engagement members. It is a stop member. Both side plates 1, 1
have the same shape and are generally in the shape of a diamond-shaped plate, and three holes 1a, 1b, and 1c are formed approximately symmetrically from the center on the longer diagonal of the long and short diagonals, as shown in FIG. However, arc-shaped embossed portions 1d and 1e are symmetrically formed around the center hole 1b.

The above-mentioned side plates 1, 1 are formed by, for example, sheet metal press molding, and are punched out from a sheet metal material into a substantially rhombic outline shape, and the three holes 1 are formed at the same time or in the next step.
a, 1b, 1c and embossed portions 1d, 1e.

The pulley 2 has a substantially semicircular annular groove 2a on its outer periphery.
It has a shaft hole 2b in the center, and the pulley shaft 3 is inserted by aligning the center shaft hole 2b with the center holes 1b, 1b of both side plates 1, 1, and the both ends of the pulley shaft 3 are inserted into the both sides plates 1, 1. It is fixed by nuts 13 and 14 on the outer surface of the.

The above-mentioned pulley shaft 3 also serves as a spacer for the side plates 1, 1, and the axial length of the large diameter portion 3a at the center is slightly larger than the axial dimension of the pulley 2.
Small diameter screw parts 3b, 3b are formed on both sides of the large diameter part 3a, and the center hole 1b of both side plates 1, 1 is
The diameter is smaller than the large diameter portion 3a and slightly larger than the small diameter threaded portions 3b, 3b.

The embossed portions 1d and 1e of the side plates 1 and 1 are formed to approximately correspond to the outer diameter of the pulley 2, and
The protruding portions are provided so as to face each other inwardly, so that the pulley 2 contacts the side plates 1, 1 only at its outer peripheral portions, that is, the embossed portions 1d, 1e, and The contact friction area to 1 is reduced.

The check lever 4 is pivotally mounted between the side plates 1 and 1 via a pivot 5 at a position where the tip thereof circumscribes the pulley 2.
The circumferential surface of the pulley 2 has a locking pawl 4a in the form of uneven teeth.

The non-return lever 4 has a plurality of claw plate pieces 4a' between the tips of two side plates 4b, 4b, and roll pins 4c, 4c.
Connecting pin 4 that is fixed at the rear end and also serves as a spacer between the rear ends
d is fixed, and shaft holes 4e, 4e are provided in the middle of the two side plates 4b, 4b. These side plates 4b and 4b and the claw plate pieces 4a' are formed by sheet metal press molding.

The check lever 4 may be made of other than a sheet metal press molded product.

The locking pawl 4a of the check lever 4 has a plurality of concave and convex tooth surfaces formed in the longitudinal direction of the rope 8, and the tooth shape is a symmetrical chevron or sawtooth shape, and a convex circular arc with respect to the longitudinal direction of the rope 8. They are arranged on a trajectory, and in the cross-sectional direction of the rope 8 are formed in a concave arc shape along the outer circumferential arc of the rope 8 .

As shown in FIG. 3, the pivot shaft 5 of the check lever 4 has a large diameter portion 5a at the center and small diameter threaded portions 5b, 5b on both sides.
The diameter of the small diameter threaded portions 5b, 5b is slightly smaller than that of the holes 1a, 1a, and a spacer is provided to hold the side plates 1, 1 at a predetermined interval with the large diameter portion 5a. Also serves as.

The shaft hole 4e of the check lever 4 is connected to the large diameter portion 5 of the pivot shaft 5.
The large diameter portion 5a of this pivot 5 has a diameter slightly larger than that of a.
is passed through the shaft hole 4e to swingably support the check lever 4, and a washer 1 is provided between the side plates 1 and 1.
5 and 16, and the locking claw 4a is inserted into the pulley 2.
The position is maintained in alignment with the annular groove 2a. Note that both ends of the pivot 5 are connected to both side plates 1, 1.
Nuts 17 and 18 are screwed together on the outer surfaces of the two sides, and both side plates 1 and 1 are tightened by these nuts 17 and 18.

As shown in FIG. 3, the rope guide member 6 has a large diameter portion 6a in the center, and small diameter threaded portions 6b on both sides.
6b, the large diameter portion 6a has a larger diameter than the holes 1c, 1c in the side plates 1, 1, and the small diameter threaded portions 6b,
6b has a slightly smaller diameter than the holes 1c and 1c,
The large diameter portion 6a also serves as a spacer to hold the side plates 1, 1 at a predetermined distance, and the small diameter screw portions 6b, 6b at both ends are tightened with nuts 19, 20 on the outer surfaces of the side plates 1, 1.

Although an annular concave arc surface 6c serving as a rope guide is formed at the center of the large diameter portion 6a of the rope guide member 6, a rotatable roller may be inserted over the large diameter portion 6a.

The lock release lever 7 is attached to one side plate using the rope guide member 6 and one nut 19.

The rope 8 can be a 12φm/m nylon rope [JISL2704 compliant product] currently specified by the Ministry of Labor's safety belt structure standards, etc., and can be of any length. A locking member 12 is attached to the fixing member 10 of.

As the locking member 12, a releasable locking member such as a carabiner or a safety hook can be used.

Furthermore, the structure of the locking member 11 between the connecting pin 4d at the rear end of the check lever 4 and the other fixed member 9 can be the same as that of the locking member 12 described above.

The rope tensioner of the present invention has the above-mentioned configuration, and how to use it will be explained next.

First, the tip of the rope 8 pulled out from the rope guide member 6 side is locked to one of the fixed members 10 via the locking member 12, and the rear end of the check lever 4 is locked. The connecting pin 4d is locked to the other fixed member 9 via the locking member 11.
When the rope 8 pulled out from the locking claw 4a side of the check lever 4 is pulled, the rope 8 can be tensioned between both the fixing members 9 and 10.

The check lever 4 has a locking claw 4 on the outer peripheral surface of the rope 8.
The locking pawl 4a bites in to hold the rope 8 in tension, and the locking pawl 4a bites deeper to prevent the rope 8 from being fed out in the loosening direction.

Therefore, in order to loosen the rope 8, when the lock release lever 7 is pulled in the direction of arrow A, the pulley 2 moves the locking pawl 4 around the pivot shaft 5 of the check lever 4.
The rope 8 is rotated in a direction away from a, the locking pawl 4a is disengaged, and the rope 8 can be freely relaxed.

In the embodiment, the pulley 2 is made of a light alloy, for example, an aluminum alloy, but it can be made of other metals, hard synthetic resin, real material, etc. The pulley shaft 3, pivot shaft 5, and rope guide member 6 are also made of light alloy, other metals,
Alternatively, it may be made of other materials.

Effects of the invention According to the invention, first, both side plates are connected only by three shaft rods: the pulley shaft in the center, the pivot of the check lever at one end, and the rope guide member at the other end. , it is possible to reduce the number of man-hours for connecting both side plates, and it is not only possible to provide the device at low cost, but also to reduce the weight.

In addition, since an arcuate groove-shaped embossed part that substantially corresponds to the outer diameter of the pulley and comes in contact with it is formed in the center of each side plate to face the inner side and protrude, the contact friction surface of the pulley can be reduced, and The axial tilt of the pulley can be reduced, and the embossed part improves the strength of the central part of both side plates, which allows the plate thickness to be made thinner, which not only reduces weight but also improves press formability. , can be provided at low cost.

Furthermore, since the lock release lever is connected to the both side plates at the attachment position of the rope guide member, when the rope is released from the locked state, the entire side plates are rotated around the pivot of the check lever.
Since the distance between the fulcrum and the point of force is approximately equal to the total length in the longitudinal direction of both side plates and the lever ratio can be maximized, it can be released with a small force, so it can be constructed at low cost with a simple flat member.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of the use of the device of the present invention;
FIG. 2 is a plan view, and FIG. 3 is an exploded perspective view. DESCRIPTION OF SYMBOLS 1...Both sides plates, 2...Pulley, 3...Pulley shaft, 4...Return lever, 5...Pivot, 6...Rope guide member, 7...Lock release lever, 8...
Rope, 9, 10... Fixed member, 11, 12...
Locking member.

Claims (1)

[Claim for Utility Model Registration] A pair of side plates, a pulley rotatably supported via a shaft between the two side plates, and a pulley that can swing between the two side plates at a position where the tip can be circumscribed to the pulley. a non-return lever which is pivotably mounted, has a locking pawl in the shape of uneven teeth on the circumferential surface of the tip of the pulley, and whose rear end can be locked to one of the fixing members at the rope tensioning point; A rope guide member is installed between both side plates at a position substantially symmetrical to the pivot position of the check lever, and a lock is attached to a part of both side plates to release the lock of the rope by the check lever. One end of the release lever can be locked to the other fixed member at the rope tensioning point, and the other end is a free end. In a rope tensioner that consists of a rope stretched in a shape, both side plates are connected to three shafts: a central pulley shaft, a check lever pivot at one end, and a rope guide member at the other end. At the same time, in the center of both side plates, an embossed part in the shape of an arc groove that corresponds to the outside diameter of the pulley and comes in contact with it is formed to protrude inwardly, and the lock release lever can be attached to the rope guide member. A rope tensioner characterized by being connected to both side plates at certain points.