JPH11257467A - Pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pull-out of a rope to the outside of a pulley due to release oscillation of a moving frame, in a static pulley type pulley wherein a part of a frame is opened and closed by the moving frame and the arbitrary middle of the rope is hooked at a pulley wheel. SOLUTION: A frame comprises a fixed frame 7 to support a pulley wheel 2; and a moving frame 8 opening and closing a release part 19 for hooking a rope. The moving frame 8 is rotated in a reciprocating manner around a spindle 3, a hook part 23 is arranged at one end of a main surface wall 21, and a fastening wall 24 is arranged on the other end side. The fastening wall 24 is supported by an end wall 11, and securely fastened by a screw 27 screwed in the end wall 11 of the fixed frame 7 such that release and oscillation are impossible to make. With a state that the release part 19 is closed by the main surface wall 21 of the moving frame 8, the hook part 23 is engaged with a hooking protrusion 20 on the fixed frame 7 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley of a static pulley type in which a frame supporting a pulley wheel is formed in a closed loop. The pulley is attached to a tent frame, a windsock pole, or the like, and can be used to transfer or guide a rope, a wire, or the like.

[0002]

2. Description of the Related Art In this type of pulley, there is a pulley in which a part of a frame is opened and closed so that an arbitrary halfway portion of a rope can be hooked on a pulley wheel (groove) (unknown document).
As shown in FIG. 6, this pulley forms a frame with a fixed frame 40 and a movable frame 41, and the movable frame 41 is rotatably supported on the fixed frame 40 by a support shaft 42. The opening 43 opened between the upper and lower side walls can be opened and closed by the movable frame 41. The movable frame 41 is provided with a hook portion 44 having a hook groove. The hook portion 44 is hooked on a screw 46 provided on a lower side wall 45, and then the screw 46 is screwed to open the movable frame 41. Can be fixed so as not to swing. Reference numeral 47 denotes a pulley wheel, and 48 denotes a rope.

[0003]

According to the pulley of the closed frame type provided with the movable frame 41, the rope 48 is already used.
Can be easily hooked on the pulley wheel 47 through the opening 43 even when the rope is stretched. Further, by fixing the movable frame 41 with the screw 46, it is possible to close the opening 43 and prevent the rope 48 from falling off the pulley. However, since the hook portion 44 is merely pressed and fixed with the screw 46, the movable frame 41 easily opens and swings when the screw 46 is loosened due to external vibration or the like, and the rope 48 is pulled out of the pulley. There is a risk of falling off.

SUMMARY OF THE INVENTION It is an object of the present invention to easily hook any intermediate portion of a rope on a pulley wheel, even though the frame is configured as a closed loop, and to prevent the rope from falling off the pulley in use. An object of the present invention is to provide a pulley that can be reliably prevented. Another object of the present invention is to prevent the movable frame from opening and swinging around the support shaft even when external vibrations, impacts, etc. constantly act on the pulley, so that the rope does not fall out of the pulley. Is to surely prevent

[0005]

The pulley according to the present invention comprises:
As shown in FIGS. 1 to 3, a closed loop frame 1
, A pulley wheel 2 is rotatably supported by a support shaft 3 supported on both sides of the frame 1. The frame 1 includes a fixed frame 7 that supports the support shaft 3 and a movable frame 8 that is disposed on one outer surface of the fixed frame 7 and that opens and closes a rope hooking opening 19 provided on the fixed frame 7. Have. The movable frame 8 is bent substantially orthogonally to the main surface wall 21 rotatably supported by the support shaft 3, a hook portion 23 provided at one end of the main surface wall 21, and the other end of the main surface wall 21. Fastening wall 2
4 is provided. On the lower side wall 16 facing the opening 19 of the fixed frame 7, there is provided a hooking projection 20 which is engaged with and disengaged from the hook 23. A screw 27 for fixing the fastening wall 24 is screwed into the end wall 11 of the fixed frame 7 facing the rope guide circumferential groove of the pulley wheel 2. When the surface wall of the main surface wall 21 on the hook portion 23 side closes the open portion 19, the hook portion 2
3 engages with the latching projection 20, the fastening wall 24 is received by the end wall 11, and the fastening wall 24 can be fastened and fixed non-rotatably by the screw 27.

That is, the end of the side wall 12 and the end of the upper side wall 10 sandwiching the pulley wheel 2 on either side has one of the front half and the rear half connected by the end wall 11, and the other corner has the fastening wall 24. The escape portion 14 along the opening / closing locus is cut out. A groove 25 is formed in the fastening wall 24 to engage with the screw 27.

The fixed frame 7 comprises a first frame 7A including an upper wall 10, an end wall 11 and a side wall 12, and a second frame 7B having a lower wall 16. The first frame 7A and the second frame 7B are joined and fixed by welding on the side facing the end wall 11 with the pulley wheel 2 therebetween, and a ring for the mounting bracket 4 is fixed to the weld joint. 5 is provided in a penetrating shape.

[0008]

[Operation] The movable frame 8 reciprocates around the support shaft 3,
An opening 19 for hooking a rope provided on the fixed frame 7 is opened and closed. When the opening 19 is closed by the main surface wall 21,
The hook portion 23 is engaged with the hooking projection 20 provided on the lower side wall 16. Further, the fastening wall 24 is received by the end wall 11 and fixed by screws 27 screwed into the end wall 11. In this manner, when the movable frame 8 is engaged and fixed at two positions on both ends of the main surface wall 21, it is more reliable that the movable frame 8 tries to rotate to the side where the opening 19 is opened as compared with the conventional pulley. Can be prevented. The fastening wall 24 is provided so as to be bent substantially orthogonally from one edge of the main surface wall 21,
The support shaft 3 is fastened and fixed to the end wall 11 by screws 27 along an axis substantially perpendicular to the center axis of the support shaft 3. Therefore, screw 27
When the screw is operated, the fastening wall 24 is elastically deformed in a direction in which it comes into close contact with the end wall 11 and repels the tightening force of the screw 27. Therefore, even when a permanent external vibration acts on the pulley, the screw 27 is prevented from loosening.

When the movable frame 8 is closed from the open rotation position, the fastening wall 24 of the movable frame 8 crosses the corners of the side wall 12 and the upper side wall 10 of the fixed frame 7. In this case, in order to prevent the fastening wall 24 from contacting and interfering with the fixed frame 7, a relief portion 14 is provided at a corner. The reason for providing the groove 25 in the fastening wall 24 is that the screw 27 is screwed into the end wall 11,
This is for engaging the groove 25 with the screw 27 by rotating and displacing the fastening wall 24.

A fixed frame 7 is formed by a first frame 7A and a second frame 7B, and a mounting bracket 4 is attached to a welded joint between the two frames 7A and 7B.
When the connecting hole 17 for hooking the ring 5 is provided, the pulley structure is simplified as compared with the case where a hooking part for the ring 5 is provided separately from the fixing frame 7.

[0011]

1 to 4 show an embodiment of a pulley according to the present invention. In FIG. 2, the pulley includes a closed-loop frame 1, a pulley wheel 2 disposed in the frame 1, a support shaft 3 that supports the pulley wheel 2, and the like. The pulley wheel 2 is formed in the shape of a door roller, and has a circumferential groove having a semicircular cross section on the circumferential surface. Reference numeral 4 denotes a mounting bracket mounted on the tent frame, and a pulley is supported by a D-shaped ring 5 provided on the mounting bracket 4.

In FIG. 3, the frame 1 comprises a fixed frame 7 and a movable frame 8. The fixed frame 7 includes a first frame 7A and a second frame 7B. The first frame 7A has a rectangular upper wall 10, an end wall 11 connected to the upper end thereof, a side wall 12 connected to the end wall 11, and a joint wall bent continuously in an inverted L-shape at the lower end of the side wall 12. 13 are formed integrally with each other by a press-formed product made of a stainless steel sheet, and the upper side wall 10 and the side wall 12 facing left and right support the support shaft 3 laid therebetween in a bilateral manner. The support shaft 3 is fixed by caulking on the outer surface side of the side wall 12. The end wall 11 connects the upper side wall 10 and the side wall 12 in the front half of the upper end of both side walls.
The corner on the rear half side of 0.12 is rounded as an escape portion 14 in order to avoid contact interference with a fastening wall 24 described later.

In FIG. 3, the second frame 7B is made of a press-formed product made of a stainless steel plate in which an inverted L-shaped joining wall 15 and a lower side wall 16 are integrally formed, and the joining wall 15 is joined to the first frame 7A. The surface is joined to the joining wall 13 by spot welding to form the fixed frame 7 integrally with the first frame 7A. The ring 5 is hooked and connected to a connection hole 17 provided in both the joining walls 13 and 15. Lower wall 16 of second frame 7B
Is located at a small distance from the upper wall 10 of the first frame 7A (the opening 1
The rope R can be hooked on the pulley wheel 2 from this open portion 19. At the front and rear centers of the upper edge of the lower side wall 16 facing the opening 19, a latching projection 20 for latching and engaging a hook 23 described later is formed to bulge.

The movable frame 8 has a main surface wall 21 rotatably supported by the support shaft 3, and a hook portion having a groove 22 for engaging with the engaging projection 20 at a lower end of the main surface wall 21. 23, and a fastening wall 24 is provided continuously with the front half of the upper end edge of the main surface wall 21.
Is formed by pressing a stainless steel plate which is bent orthogonally. A U-shaped groove 25 is formed at the center of the front edge of the fastening wall 24. In the lower corner of the front end of the hook portion 23, an operation piece 26 for finger hooking is formed by being bent in a direction opposite to the fastening wall 24.

The movable frame 8 has an opening 1 at a lower portion of the main surface wall 21.
1 is closed (see FIG. 1).
(A solid line state) and a rope detachable state in which the main surface wall 21 rotates clockwise around the support shaft 3 to open the opening 19 (an imaginary line state in FIG. 1). In the steady state, the groove 22 of the hook 23 is engaged with the engaging projection 20. The fastening wall 24 is vertically opposed to the end wall 11 with a slight gap therebetween, and the groove 25 is engaged with the screw shaft of a screw (screw) 27 screwed into the end wall 11 by being guided from the rear side. (See FIG. 4). Therefore, when the fastening wall 24 is fastened and fixed to the end wall 11 by screwing the screw 27, the movable frame 8 is fixedly held so as not to rotate and cannot be opened. At this time, the fastening wall 24 is slightly elastically deformed toward the end wall 11 and repels the tightening force of the screw 27, so that the screw 27 receives the same loosening preventing action as that using a spring washer.

When the screw 27 is completely screwed in, the screw shaft end is located near the orbital groove of the pulley wheel 2 as shown in FIG.
Divide the gap between the right and left. Therefore, it is possible to prevent the rope R from being accidentally inserted into the inner surface of the end wall 11. Since the front and rear side surfaces of the frame 1 are respectively opened, the rope R can be prevented from contacting and interfering with the frame 1 even when the rope R is reversed and guided by the pulley wheel 2.

FIG. 5 shows another embodiment of the present invention in which a part of the above pulley is modified. In this case, an engagement shaft portion 29 having a diameter larger than that of the screw shaft portion is provided below the neck of the screw 27. Correspondingly, the groove 25 is formed in the shape of a keyhole that expands inward in a plan view, and a receiving hole 30 that receives the engaging shaft portion 29 is provided on the deep end side of the groove 25. Further, a small vertical gap is provided between the fastening wall 24 and the end wall 11. In a state where the screw 27 is completely screwed, the engagement shaft 29 is engaged with the receiving hole 30 and the movable frame 8 is
To prevent the open rotation. According to this embodiment, the screw 27
Even if is loosened, the movable frame 8 can be kept in a steady state as long as the engagement shaft portion 29 does not come out of the receiving hole 30. Other components are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted.

In addition to the above, the hook portion 23 is joined to the inner surface of the lower wall 16 in a steady state, and the groove 22 is changed so as to engage with the engaging projection 20 bulging to the inner surface of the lower wall 16. it can. The mounting bracket 4 is not limited to the metal fittings described in the embodiment because different metal fittings are used depending on the application target of the pulley. The relief portion 14 can be formed in a chamfered shape.

[0019]

According to the present invention, the hook portion 23 is attached to the movable frame 8.
And the fastening wall 24, and the movable frame 8 is fixed to the fixed frame 7 at each of one end and the other end of the main surface wall 21 that sandwiches the support shaft 3.
Can be engaged and fixed. Therefore, compared with the conventional pulley, the movable frame 8 is more securely fixed and held,
The movable frame 8 can be prevented from swinging open, and the reliability of the pulley can be improved accordingly. The fastening wall 24 is provided so as to be substantially perpendicular to the main surface wall 21, and in a state where the fastening wall 24 is fastened and fixed to the end wall 11 with the screw 27, the fastening wall 24 is elastically deformed and repels the fastening force of the screw 27. Because we configured
Even when external vibrations or the like constantly act on the pulley, loosening of the screw 27 can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a pulley.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an exploded perspective view of a pulley.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is an exploded perspective view showing another embodiment of the pulley.

FIG. 6 is a side view of a conventional pulley.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 frame 2 pulley wheel 3 support shaft 5 ring 7 fixed frame 7A first frame 7B second frame 8 movable frame 10 upper side wall 11 end wall 12 side wall 14 relief portion 16 lower side wall 17 connecting hole 19 opening portion 20 opening projection DESCRIPTION OF SYMBOLS 21 Main surface wall 23 Hook part 24 Fastening wall 25 Groove 27 Screw

Claims (3)

[Claims] 1. A pulley, wherein a pulley wheel 2 disposed inside a closed-loop frame 1 is rotatably supported by a support shaft 3 supported on both sides of the frame 1. The frame 1 is a support shaft. 3 and a fixed frame 7
And a movable frame 8 that is disposed on one outer surface of the fixed frame 7 and opens and closes a rope hooking opening 19 provided on the fixed frame 7. The movable frame 8 is rotatably supported by the support shaft 3. Main wall 21
And a hook portion 23 provided at one end of the main surface wall 21, and a fastening wall 24 bent substantially orthogonally to the other end edge of the main surface wall 21. Hook 2
3, a screw 27 for fixing the fastening wall 24 is screwed into the end wall 11 of the fixed frame 7 facing the rope guiding circumferential groove of the pulley wheel 2. When the surface wall of the main surface wall 21 on the hook portion 23 side closes the opening 19, the hook portion 23 engages with the latching projection 20, and the fastening wall 24 is received by the end wall 11 and cannot be rotated by the screw 27. Pulley that can be fastened and fixed to 2. A side wall 1 sandwiching a pulley wheel 2 from side to side.
Either the front half or the rear half of the end of the upper wall 2 is connected to the end wall 11, and the other corner has a cutout 14 formed along the opening / closing locus of the fastening wall 24. The pulley according to claim 1, wherein a groove (25) for engaging with the screw (27) is formed in the fastening wall (24). 3. The fixed frame 7 includes a first frame 7A having an upper wall 10, an end wall 11 and a side wall 12, and a second frame 7B having a lower wall 16. 7A and the second frame 7B are connected to the pulley wheel 2
Are joined and fixed by welding on the side facing the end wall 11, and a ring 5 for the mounting bracket 4 is attached to the weld joint.
The pulley according to claim 2, wherein the connection hole (17) for hooking is provided in a penetrating manner.