JPH05332380A - Spring connecting structure - Google Patents

Abstract

PURPOSE:To provide a spring connecting structure without dislocating a coil spring, in spite of using coil spring having no hook part in the end part, by forming a stopper part, which can engage a wire end of the coil spring against spring tension, by narrowing widths of end part sides opposed to each other of both brackets. CONSTITUTION:In assembly of both brackets 55, 60 and a coil spring 52, after externally fitting both ends of the coil spring 52 in a screw-in state to recessed parts 56, 61 formed in both the brackets 55, 60, wire ends 52a in the both ends of the coil spring 52 are engaged with upper/lower positioned stopper parts 59, 64 against spring tension. The wire ends 52a can be engaged with the lower/ upper positioned stopper parts 59, 64 by spreading a clearance between wire parts externally fitted to the recessed parts 56, 61, and restoration spring tension tending to move in a biting state in a direction of narrowing width can be applied to act, in the lower/upper positioned stopper parts 59, 64. Accordingly, engagement can be firmly performed without dislocating the coil spring, and a structure can be easily applied even to a location of high frequent extension and contraction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring coupling used for a trolley or the like having a lifting / lowering load receiving portion capable of holding articles such as parts at a constant height at all times and performing an unloading operation in a comfortable posture. It is about structure.

[0002]

2. Description of the Related Art Conventionally, as this type of bogie, for example, an automatic vertical working bogie disclosed in Japanese Utility Model Publication No. 54-16427 is provided. In this conventional type, a pillar is erected from the rear part of the vehicle body, and a mounting table is provided which is guided up and down to move up and down, and a plurality of springs are provided between the hanger plate interlocking with the mounting table and the vehicle body. It is arranged. Then, when an article is placed on the mounting table, the hanger plate rises against the contracting force of the spring group, so that the mounting table descends according to the load.

However, in the above-mentioned conventional type, the spring is expensive because it has the hook portions at both ends, and the existence of the hook portions requires securing a space for disposing the hook portions vertically. As a result, the pillar side becomes bulky and the overall size becomes large.

As a structure for connecting a spring having no hook portion to a bracket, for example, Japanese Patent Publication No. 31895/1978.
There is provided a method of mounting the spring found in the publication. In this conventional configuration, a screw portion is formed on the shaft portion of the mounting member, and the end portion of the cylindrical coil spring is screwed into the screw portion for connection.

[0005]

However, according to the conventional type in which the end portion of the coil spring is screwed into the above-mentioned screw portion, there is a risk that the coil spring may come off the screw portion due to repeated expansion and contraction of the coil spring. there were.

An object of the present invention is to provide a spring connecting structure in which the coil spring does not come off even though it uses a coil spring having no hook portion at its end.

[0007]

In order to achieve the above object, a spring connecting structure according to the present invention is a spring connecting structure in which a tension type coil spring is interposed between a fixed side bracket and a movable side bracket. A recess is formed in the bracket for externally fitting the end of the coil spring into a screwed shape, and the wire end of the coil spring is engaged with the position outside the recess of both brackets against the spring force. The stopper is formed by narrowing the widths of the opposite ends of both brackets.

[0008]

According to the structure of the present invention, both the brackets and the coil springs are assembled by screwing both ends of the coil springs into the recesses formed in the brackets, and then wire ends of both ends of the coil springs. This can be done by engaging the lower locking portion and the upper locking portion against the force. At this time, the line ends are
Since the gap between the line part externally fitted to the recess is widened and engaged with the lower locking part or the upper locking part, the lower locking part or the upper locking part bites in the narrow direction. The restoring spring force that tries to move in a circular shape acts.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 6 to 8, reference numeral 1 denotes a base, which is formed in an H shape by a pair of left and right side frames 1A and a transition frame 1B that connects intermediate portions near the rear ends of these side frames 1A. 1 recessed part before and after
It has C and 1D. The front wheels 3 are attached to the lower surfaces of the front portions of both side frames 1A via fixed brackets 2, and the rear wheels 5 are attached to the lower surfaces of the rear portions via turning brackets 4. Then, the reinforcing member 6 is provided in the both side frames 1A.
, And resin corner members 7 are attached to the front and rear ends of the both side frames 1A.

From the transition frame 1B to both side frames 1
A column member 10 is erected from the upper surface over A. The strut member 10 includes a pair of left and right posts 11 that are erected from both side frames 1A, a lower beam 12 that connects between lower ends of these posts 11, an upper beam 13 that connects between upper ends thereof, and both posts.
11 and a back panel 14 disposed between the rear surfaces of both beams 12 and 13
And a front panel placed between the front faces of both beams 12 and 13.
15 and an upper resin cover 16 disposed between the upper ends of both posts 11 and the upper surface of the upper beam 13. The transition frame 1B and the lower beam 12 are detachably connected by a plurality of fixtures (bolts or the like) 19, and further between the side edge of the front panel 15 and the inner side surfaces of both posts 11,
Vertical slits 17 are formed respectively.

Both posts 11 are aluminum rails, and guide grooves 18 are formed over the entire length on opposite inner surface sides thereof. Then, at the upper part of the pillar member 10, a handle 21 is provided on the rear surface side.
Is provided. The handle 21 is composed of a pair of left and right brackets 22 fixed to the rear surface side of both posts 11 and extending rearward, and a pipe body 23 in the left-right direction mounted between the free ends of the brackets 22.

As shown in FIG. 3 to FIG.
A carriage 30 that can be raised and lowered is provided inside. The carriage 30 includes a pair of left and right side frames 31, a lower frame 32 that connects the lower ends of the side frames 31 to each other, an upper guide roller 34 attached to the upper outer surfaces of the both side frames 31 via roller pins 33, and the like.
It is composed of a lower guide roller 36 attached to the outer surface of the lower portion of each side frame 31 via roller pins 35 and the like, and a connecting member 37 connected continuously from the lower portion of each side frame 31 to the front. Both guide rollers 34, 36 are made of resin and are fitted in the guide groove 18 of the post 11 and guided up and down. Further, the connecting member 37 projects through the slit 17 to the outside of the front surface of the column member 10, and can be lifted and lowered on the front surface side.

A table 40 is arranged in front of the column member 10, and the table 40 is fixed between a pair of left and right connecting members 37 via a connecting tool 41. The table 40 is composed of a U-shaped reinforcing member 42 in a plan view and a resin plate 43 having a rectangular shape in a plan view and arranged so as to cover the reinforcing member 42. It is fixed to the connecting member 37 through. The resin plate 43 has reinforcing rib portions integrally formed in a lattice pattern on the lower surface side thereof, and further has stopper portions upward from the rear end.
43a is integrally formed.

As shown in FIGS. 1 to 5, the column member 10
Between the carriage 30 and the carriage 30, an upward movement imparting device 50 for urging the carriage 30 upward is provided. Ie carriage 30
A plurality of (7 in the embodiment) cylindrical coil springs that pull in the vertical direction are arranged in the frame in the horizontal direction. Here, the pair of coil springs is a stationary coil spring 51 having a pair of hooks 51a at both ends, and the remaining five coil springs 52 for switching having no hooks at both ends.

The lower ends of the pair of stationary coil springs 51 are connected by hooking a hook portion 51a on a lower nut 53 of a bolt-nut type whose vertical position can be adjusted.
Reference numeral 53 is connected to the lower frame 32 of the carriage 30. The upper end is connected by hooking a hook portion 51a on an upper connecting member 54 formed of a bolt nut whose vertical position is adjustable, and the upper connecting member 54 is connected to the upper beam 13 of the column member 10. Here, the operating nut of the upper connecting member 54 is exposed above the upper beam 13.

A lower bracket (an example of a movable side bracket) 55 is connected to the lower end of the remaining coil spring 52 for switching. The lower bracket 55 has an elongated plate shape, and a pair of side surfaces is formed with a recess 56 for externally fitting the lower portion of the coil spring 52 into a screwed shape. The lower bracket 55 is connected to the lower frame 32 of the carriage 30 by means of a bolt 57 and a nut 58 which are vertically provided integrally. Further, at a position outside (lower side) of the recess 56 of the lower bracket 55, a lower engaging portion 59 is formed which can engage the wire end 52a of the coil spring 52 against the spring force. Here, the lower engaging portion 59 is formed in an inverted V shape with the lower surface opened, and the upper end side is narrowed.

An upper bracket (an example of a fixed side bracket) 60 is connected to the upper end of the switching coil spring 52. The upper bracket 60 has an umbrella-shaped plate shape, and a recess 61 for fitting the upper part of the coil spring 52 onto the upper part of the coil spring 52 is formed in the lower part of the pair of side surfaces. A through hole-like locked portion 62 is formed in the upper part of the center, and by bulging from the middle of both side surfaces to the upper part, it is larger than the front-back width of the side frame 31 and has a horizontal shape. The mounting portion 63 is formed. As a result, the placed portion 63 and the engaged portion 62, which is an upper layer of the placed portion 63, are formed on the upper end of the coil spring 52. Further, at a position outside (above) the recess 61 of the upper bracket 60, an upper locking portion 64 is formed which can engage the wire end 52a of the coil spring 52 against the spring force. Here, the upper locking portion 64 is formed as a V-shaped through hole that is long in the vertical direction and has a narrower width on the lower end side.

A pair of front and rear mounting plates 65 are mounted between the upper ends of both side frames 31 of the carriage 30, and triangular mountings are mounted on the upper surfaces of the mounting plates 65 and at the pitch of the coil springs 52. The placement portion 66 is formed. And the front and rear mounting parts
The mounted portion 63 can be freely placed over the space 66.

When the carriage 30 reaches the upper limit,
Plural locking tools that can be engaged and disengaged separately from the locked portion 62
70 is provided on the pillar member 10. That is, an operation pin 71 in the front-rear direction is rotatably attached to the upper beam 12, and an operation portion 71a at one end thereof is exposed to the outside of the column member 10. The locking tool 70 has a hook shape, and by locking the base of the locking tool 70 onto the operation pin 71, the locking tool 70 can swing around the pin axis, and thus can be engaged with and disengaged from the locked portion 62. Becomes

On the outer surface of the base of the lock 70, the lock 70
When the hook is in the hanging posture,
On the upper surface when it is in the locked posture where it swings 90 degrees,
Recessed recesses 72 and 73 are formed respectively. The upper beam 13 is provided with a positioning spring body 75 for elastically performing two-positioning by swinging.

These positioning spring bodies 75 are formed by deforming a leaf spring, and have one end in the length direction in which the rectangular hole 20 formed in the upper beam 12 is inserted upward from below. A curved portion 75A is formed, and a barb 75B for preventing slipping out is formed in the curved portion 75A in a cut-out shape. Further, the other end side in the length direction is set to be separated from the lower surface of the upper beam 12, and a downward convex portion 75 is formed at the center part of the other end side.
C is formed, and the concave portions 72 and 73 can be engaged with the convex portion 75C.

A stopper 78 is provided on the lower surface of the tip of the table 40 so as to come into contact with the upper surface of the side frame 1A when the table 40 reaches the lower limit. Reference numeral 79 denotes a load to be handled, which is formed by stacking cases containing a large number of articles in a plurality of stages.

Next, the usage of the above embodiment will be described. The both brackets 55, 60 and the coil spring 52 are assembled by screwing both ends of the coil spring 52 into the recesses 56, 61 formed in the brackets 55, 60, and then wire ends 52a of both ends of the coil spring 52. Against the spring force, lower lock 59 and upper lock
This can be done by engaging 64. At this time, since the line end 52a is engaged with the lower engaging portion 59 and the upper engaging portion 64 by widening the gap between the line end 52a and the line portion externally fitted to the recesses 56 and 61, these lower engaging portions are engaged. At the portion 59 and the upper locking portion 64, a restoring spring force that tries to bite in the narrow direction acts, and thus the engagement is firmly performed by the restoring spring force.

1 to 8 show a state in which all the locking members 70 are in the working positions. In this state, load onto the table 40 79
The load is transmitted to the carriage 30 through the connecting member 37 and the like by placing, and the carriage 30 is lowered against the elastic force of the coil springs 51 and 52. At this time, all coil springs 51, 52 act, so the maximum load is applied.
Can handle 79. When the maximum load is exceeded or the maximum load is exceeded, the stopper attached to the lower surface of the tip of the table 40
78 contacts the upper surface of side frame 1A (see phantom line in FIG. 7)
However, the load is dispersed and supported through the stopper 78 and the connecting member 37.

The carriage supporting the load 79 as described above is
The operator moves forward by manually pushing the handle 21 to perform forward pushing, while pushing the hand while positioning the toes near the recessed portion 1D formed on the rear end side of the base 1.
Further, the worker moves backward by pulling and traveling via the handle 21 in a posture facing the traveling direction, and at that time, the pulling work can be performed while positioning the heel near the recessed portion 1D described above. Therefore, both pushing and pulling can be performed without the foot colliding with the base 1.

After the load 79 is carried to a predetermined place through the carriage, for example, the articles are processed while being taken out one by one, or assembled to other articles. At that time, the load by the load 79 is gradually reduced, and accordingly, the carriage 30 is gradually raised by the elastic force of the coil springs 51, 52. As a result, the upper surface of the load 79 (article take-out action surface)
Is kept constant or nearly constant. And table 40
When the upper load 79 is emptied, the table 40 is raised to the upper limit through the carriage 30.

As described above, when the carriage 30 is at the upper limit position, the placing portion 66 of the placing plate 65 abuts against the placed portion 63 from below, and the engaged portion 62 is slightly lifted to bring the engaging member 70 into contact. It is in a state of being loosely locked to and is supported by the mounting portion 63. At this time, the positioning spring body 75 is placed in the recess 72 of the locking tool 70.
Since the convex portion 75C of the is elastically engaged,
Does not swing unexpectedly.

When the load 79 to be handled is light and it is not necessary to use all the coil springs 51 and 52, the number of the load 79 to be used is reduced with the load 79 being empty. That is, the operation pin 71 corresponding to the coil spring 52 to be switched to non-use is rotated by setting a tool on the operation portion 71a.
As a result, the convex portion 75 of the positioning spring body 75 is resisted against the elastic force.
As C moves upward, the locking tool 70 comes off from the locked portion 62,
As a result, the locking tool 70 becomes horizontal as shown by the phantom line in FIG. At this time, another convex portion 75 of the positioning spring body 75 is provided in another concave portion 73.
Since C engages elastically, the horizontal posture of the locking tool 70 is maintained. In addition, the upper end of the coil spring 52 that has not worked is held orderly via the mounting plate 65 as described above. In this way, the number of acting coil springs 52 can be changed according to the maximum load of the load 79 for handling.

The raising and lowering of the carriage 30 described above is performed by using the guide groove.
The guide rollers 34, 36 are guided by the guide roller 18, and the guide rollers 34, 36 are guided on a fixed path. At this time, the upper guide roller 34 is guided to the front guide surface and the lower guide roller 36 is guided to the rear guide surface due to the eccentric load applied to the table 40. Note that, for example, the case that has become empty is removed or placed below the raised table 40 between the frames 1A on both sides.

In the above embodiment, the lower engaging portion 55 has an inverted V-shaped open shape, and the upper engaging portion 64 has a V-shaped penetrating shape, but these shapes can be arbitrarily determined. Further, in the above-mentioned embodiment, the spring connecting structure is adopted in the truck having the lifting / lowering load receiving portion, but this is not limited as long as it has a movable portion and is arranged between the movable portion and the fixed portion. It can also be applied to the device.

[0031]

According to the present invention having the above-described structure, both the brackets and the coil springs are assembled by screwing both ends of the coil springs into the recesses formed in the brackets, and then wire ends of both ends of the coil springs. Can be engaged with the lower locking portion or the upper locking portion against the spring force.
At this time, the line end can be engaged with the lower locking part or the upper locking part by widening the gap between the line end and the line part fitted to the recess, and therefore the lower locking part or the upper locking part has a narrow width. It is possible to exert a restoring spring force that tends to bite in the direction of.

As described above, according to the present invention, it is possible to use an inexpensive coil spring which does not have a hook portion at the end portion and does not cause a dead space, and the engagement can be performed firmly without the coil spring coming off. It can be easily adopted even in places where expansion and contraction occur frequently.

[Brief description of drawings]

FIG. 1 is a side view of a connecting portion of a switching coil spring according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of an upper connection portion of the switching coil spring.

FIG. 3 is a vertical sectional side view of the same motion imparting device section.

FIG. 4 is a partially cutaway front view of the same motion imparting device section.

FIG. 5 is an enlarged view of a main part in FIG.

FIG. 6 is a perspective view of the entire bogie.

FIG. 7 is a partially cutaway side view of the vehicle.

FIG. 8 is a cross-sectional plan view of the bogie.

[Explanation of symbols]

 1 Base Stand 3 Front Wheel 5 Rear Wheel 10 Strut Member 11 Post 21 Handle 30 Carriage 40 Table 50 Upward motion imparting device 51 Coil spring for stationary 52 Coil spring 52a for switching 52a Wire end 53 Lower connector 54 Upper connector 55 Lower Bracket (movable bracket) 56 Recessed portion 59 Lower locking portion 60 Upper bracket (fixed side bracket) 61 Recessed portion 64 Upper locking portion 70 Locking tool

Claims (1)

[Claims] 1. A spring coupling structure in which a tension type coil spring is interposed between a fixed side bracket and a movable side bracket, wherein both brackets are formed with a recess into which the end of the coil spring is externally screwed. Then, at a position outside the recessed portion of both brackets, a locking portion that can engage the wire end of the coil spring against the spring force is provided, and the opposite end sides of both brackets are narrowed. A spring connection structure characterized by being formed.