JPH0627343Y2 - Spring balancer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spring balancer used for suspending working equipment or tools.

(Prior Art) A spring balancer lifts work equipment or tools, stops the lifted equipment or tool at any position during the stroke, and raises and lowers freely and smoothly by applying a slight force. A fishing tool that can be used (Production term dictionary, published by Toyota Motor Corporation, 1985 edition,
(P189-190), the stop position is adjusted by the spring force according to the weight of the equipment and tool to be suspended.

FIG. 6 shows a conventional spring balancer. A rotating member c around which a wire b is wound is rotatably held in a casing a, and the rotating member c is moved in the unwinding direction of the wire b by a spring (not shown). Bombing has been activated.

To use the tool d attached to the tip of the wire b, the tool d may be pulled to unwind the wire b and stop at an arbitrary position.

When the tool d has been used, the tool d can be released,
The rotating member c is rotated in the wire rewinding direction by the elastic urging force of the spring, and the wire b is rapidly rewound,
The tool d returns to the original position.

(Problems to be Solved by the Invention) In the conventional example as described above, the rewinding of the wire b is rapid as described above, so that the ascending speed of the tool d is high, and therefore the tool d collides with another tool. Which caused damage to and damage to the tool.

Further, depending on how the tool d is released, since the tool d shakes considerably, there is a risk of hitting the worker's head, face, body, etc., leading to a decrease in workability.

The present invention was made to solve the above problems,
The purpose of the present invention is to obtain a spring balancer having a slow wire rewinding speed.

(Means for Solving Problems) According to the present invention, a roller rotatably supported by each of a pair of support shafts attached to a mounting plate integrated with a spring balancer body and holding the wire, and the support shaft And a one-way clutch which is provided on at least one side and regulates rotation of a corresponding roller in a wire rewinding direction, and one supporting shaft on the side on which the one-way clutch is provided is rotatably attached to the attachment plate, In addition, the one support shaft is configured to be braked by a braking mechanism that is provided on the mounting plate and includes a pressing member that presses the one support shaft.

(Operation) When the tool is used, when the tool is pulled, the wire is unwound from the rotating member, and together with this, the pair of rollers holding the wire freely rotate in the wire unwinding direction.

When the tool reaches an appropriate position, the wire unwinding is stopped, and the tool is used in this state.

In order to return the tool to its original position after using it, it is sufficient to release the tool, which causes the rotating member to be rotated in the wire rewinding direction by the elastic urging force of the spring. Is rewound.

On the other hand, since at least one of the pair of rollers that holds the wire is restricted from rotating in the wire rewinding direction by the one-way clutch, the rewinding force of the wire passes through the roller whose rotation is restricted. Is transmitted to a freely rotatable spindle. As a result, the rotatable support shaft tries to rotate in the wire rewinding direction, but since the rotatable support shaft is braked by the braking mechanism, it cannot rotate freely, that is, one of the rollers is thus rotated. Since the rotation is restricted and the rotatable support shaft is braked, the wire rewinding is braked, and therefore the wire rewinding does not occur rapidly.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a spring balancer according to the present invention, in which a spring balancer body 1 has a casing 2, and a rotatable member (not shown) around which a wire 3 is wound. And a spring (not shown) for elastically urging the rotating member in the wire rewinding direction.

A mounting plate 6 for mounting the braking device 5 is fixed to the casing 2 of the spring balancer body 1 by screws 7, as shown in FIG.

3 and 4 show the details of the braking device 5,
As shown in FIG. 2, the braking device 5 is located in the vicinity of the wire entrance / exit of the casing 2 and has a pair of rollers 8 and 9 for sandwiching the wire 3.

Here, the one roller 8 will be described.

One roller 8 is made of a hollow cylindrical member, and annular protrusions 10a and 10b are formed at both ends of its outer surface. The annular protrusions 10a and 10b are for preventing the wire 3 from coming off the roller 8.

The support shaft 11 is inserted into the through hole 8a of the roller 8. The support shaft 11 includes first and second small diameter portions 11a and 11b located at both ends thereof, a large diameter portion 11c located in the central portion, and first and second small diameter portions 11a and 11b and a large diameter portion 11c. The first small diameter portion 11a is inserted in the roller 8 and is formed of intermediate diameter portions 11d and 11e located between and. A space is formed between the inner surface of the through hole 8a and the first small-diameter portion 11a, the ball bearing 12 is press-fitted into one end of the large-diameter portion 11c side of this space, and the other end is a wire. A one-way clutch 13 for pressing the roller 8 in the rewinding direction is press-fitted. The end surface of the ball bearing 12 abuts on the intermediate diameter portion 11d, and the tip of the first small diameter portion 11a is attached to the socket bolt 1 via the washer 14.
5 is screwed. The washer 14 contacts the end surface of the roller 8 to prevent the roller 8 from coming off the support shaft 11.

A flange 11f is arranged outside the second small diameter portion 11b of the support shaft 11, and the flange 11f has an annular hole surrounding the second small diameter portion 11b.
A pair of ball bearings 16 and 17 are press-fitted into the annular hole 15 so that the ring bearing 15 is formed. Plural bolt holes are formed on the outer side of the annular hole 15, and the bolts 18 are screwed into these bolt holes to fix the flange 11f to the mounting plate 6.

18a is a bolt screwed to the tip of the second small-diameter portion 11b via a washer 18b, and the washer 18b is a ball bearing 1
The ball bearing 17 is prevented from coming off by pressing against the end surface of 7.

A bracket 19 is fixed to one end of the mounting plate 6, and a through hole 20 is formed in the bracket 19. A bolt 21 is screwed into one end of the through hole 20, and a steel ball 22 as a pressing member is fitted into the other end of the through hole 20 so as to be rotatable and movable in the axial direction of the through hole 20. A coil spring 23 is arranged between the bolt 21 and the steel ball 22 to elastically urge the steel ball 22 toward the spindle 11. The steel ball 22 constantly contacts the large-diameter portion 11c to brake the support shaft 11 as described later. This braking force can be adjusted by the tightening condition of the bolt 21. The end of the through hole 20 on the spindle 11 side is slightly reduced in diameter so that the steel ball 22 does not come out of the through hole 20. Reference numeral 24 is a recess formed at the tip of the bolt 21 for fitting the end of the coil spring 23. A nut 25 is screwed into the bolt 21 to prevent the bolt 21 from rotating.

Next, the other roller 9 will be described.

The roller 9 is also made of a hollow cylindrical member, and the support shaft 27 is inserted into the through hole 26. The support shaft 27 includes a small diameter portion 27a located at one end, a large diameter portion 27b located at the center, an intermediate diameter portion 27c located between the small diameter portion 27a and the large diameter portion 27b,
The small diameter portion 27a is inserted into the roller 9 with the insertion portion 27d located at the other end. A gap is formed between the inner surface of the through hole 26 and the small diameter portion 27a, ball bearings 28 and 29 are press-fitted at both ends of this gap, and one end surface of the ball bearing 28 abuts the intermediate diameter portion 27c. There is.

A bolt 31 is screwed to the tip of the small diameter portion 27a via a washer 30, and the washer 30 presses the other ball bearing 29 to prevent the ball bearing 29 from coming off. .

The insertion portion 27d of the support shaft 27 is inserted into the elongated hole 32 of the mounting plate 6. The long axis of the long hole 32 is larger than the diameter of the insertion portion 27d, and therefore, the insertion portion 27d can move slightly within the long hole 32. A bolt 33 is screwed to the insertion portion 27d via the washer 34.

A bracket 35 is fixed to the other end of the mounting plate 6, a bolt hole is formed in the bracket 35, and an adjusting bolt 36 is screwed into the bolt hole. On the other hand, the large diameter portion 27 of the support shaft 27
A recess 37 is formed at a position facing the adjustment bolt 36 in b, and one end of a coil spring 38 is inserted into the recess 37. At the other end of this coil spring 38,
A convex portion 39 protruding from the tip surface of the adjusting bolt 36 is fitted. 40 is a nut screwed to the adjusting bolt 36. The urging force on the support shaft 27 can be adjusted by the tightening condition of the bolt 36.

As can be understood from the above structure, that is, the one roller 8 is rotatable in one direction with respect to the support shaft 11, and the support shaft 11 is rotatable while being braked by the steel ball 22.

The other roller 9 is rotatable with respect to the support shaft 27,
The support shaft 27 is non-rotatable. However, the support shaft 27 is elastically biased by the coil spring 38 toward the support shaft 11 which is rotatable.

Next, the operation of the spring balancer having the above configuration will be described. When the tool 4 is used, as shown in FIG. 5, the tool 4 may be pulled in the direction of the arrow A, whereby the rotating member (not shown) rotates in the direction of the arrow B, and the wire 3 moves. Be withdrawn.

One of the pair of rollers 8 and 9 for sandwiching the wire 3 is rotatable in the wire unwinding direction, and the other roller 9 is rotatable in any direction. The unwinding can be done smoothly.

In this way, when the tool 4 reaches the predetermined position, the tool 4
Is stopped and tool 4 is used.

When the tool 4 has been used and is to be returned to its original position, the tool 4 may be released, and by doing so, the rotating member is moved in the wire rewinding direction by the elastic urging force of a spring (not shown). The wire 3 is unwound by the one-way clutch 13 because the wire 3 is unwound by the one-way clutch 13. Is transmitted to the spindle 11 via
Since 11 is braked by the steel ball 22, it rotates at a relatively slow speed.

On the other hand, the other roller 9 freely rotates even when the wire is rewound, but since the support shaft 11 is elastically urged by the coil spring 38, the other roller 9 passes through the wire 3 and is It is pressed by the roller 8, and therefore the rotation speed of the other roller 9 is not so high.

Therefore, the rewinding speed of the wire 3 is also relatively low, that is, the wire 3 is rewound in a braked state.

(Effect of the Invention) As described above, according to the present invention, when the wire is rewound,
Since the wire is braked, the speed at which the tools return to their original positions is slowed, which reduces the possibility of collision between the tools. Further, even if a collision occurs, the tool is prevented from being damaged or broken.

Further, since the returning speed of the tool is slow, the sway is suppressed as much as possible, thus reducing the risk of the tool colliding with the human body and improving the workability.

Further, since the tool does not hit the spring balancer main body strongly, abrasion of rubber or the like provided at the contact portion of the tool is prevented.

[Brief description of drawings]

 FIG. 1 is a perspective view of a spring balancer according to the present invention, FIG. 2 is a cross-sectional view of a mounting portion of a mounting plate, FIG. 3 is a front view showing an essential portion of the present invention, and FIG. 4 is an IV of FIG. FIG. 5 is a sectional view taken along line IV, FIG. 5 is an explanatory view of the operation of the present invention, and FIG. 6 is a front view of a conventional spring balancer. 1 ... Spring balancer body 3 ... Wire 4 ... Tool 8,9 ... Roller 11,27 ... Spindle 13 ... One-way clutch 22 ... Steel ball (pressing member)

Claims (1)

[Scope of utility model registration request] 1. A spring balancer body having a rotating member around which a tool hanging wire is wound, a spring for elastically urging the rotating member in a wire rewinding direction, and a mounting plate integrated with the spring balancer body. Roller rotatably supported by each of a pair of support shafts attached to the pair of rollers and holding the wire, and a one-way clutch that is provided on at least one of the pair of support shafts and restricts rotation of a corresponding roller in the wire rewinding direction. And one supporting shaft on the side provided with the one-way clutch is rotatably mounted on the mounting plate, and the one supporting shaft is mounted on the mounting plate and is pushed onto the one supporting shaft. A spring balancer characterized by being braked by a braking mechanism provided with a pressing member.