JPS5855532Y2 - lighting stand arm - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a lighting stand arm.

As a conventional lighting stand arm, a pair of arm members each having a U-shaped or substantially U-shaped cross section are installed opposite each other so that their concave portions face each other, and the upper and lower ends of both arm members are provided with the arm members. Various types of devices have been proposed in which a pivot member is disposed to pivot the arm in a parallelogram shape, and a weight-supporting spring is suspended between both arm members.

In this type of conventional lighting stand arm, when the lower side of the parallelogram is fixed, even if the inclination angle of both arm members is changed, the inclination angle of the upper side of the parallelogram does not change, and the upper pivot member corresponding to this upper side does not change. The second arm or lamp, which is further connected to the second arm, has the advantage that the angle does not change even if the inclination angle of both arm members is changed.

In addition, in this type of conventional lighting stand arm, when the inclination angle is changed so that both arm members are sequentially tilted from the vertical state to the water/submerged state, the weight that is applied to the upper ends of both arm members in the direction of tilting the arm members is reduced. However, this increase in weight is canceled out by the increase in the tension of the spring, as the spring is pulled more as both arm members are pushed down.
It is known that both arm members have the advantage of being able to be held at any desired angle of inclination.

However, in the above spring, it is difficult to manufacture a spring in which the above-mentioned change in weight as the inclination angle changes and the above-mentioned change in tensile force as the inclination angle changes completely match. In the range where the arm member is tilted up to a certain angle, the tensile force of the spring is superior, and when the arm member is tilted beyond a certain angle from the vertical direction, the tensile force of the spring becomes smaller than the weight mentioned above, and it is not always possible to tilt the arm member at a desired angle. It is also known that it has the disadvantage that there are cases where it cannot be maintained.

Therefore, the present invention has developed a lighting stand arm that can handle the above-mentioned weight changes that cannot be handled by the spring alone and can be held securely at any tilt angle by applying an adjustable frictional force between both arm members. It was developed.

Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

In the figure, 20 is a first arm, and this first arm 20
consists of a pair of arm members 20 a and 20 b each having a substantially U-shaped or U-shaped cross section, and are disposed oppositely so that their concave portions face each other.

In addition, in this embodiment, both arm members 20a, 2
The cross-sectional shape of 0b has a structure as shown most clearly in FIGS. 2 and 4, in which a groove 24 having a wide portion 24a on the back side is provided in both side walls of a U-shaped cross section. There is.

This groove 24 is for mounting a connecting plate 70 shown in FIG. 4, and the connecting plate 70 has a wide base 71 on one side inserted into the wide portion 24a of the arm member 20a on one side. The other side is inserted into and out of the groove 24 of the other side arm member 20b, and a wiring 60 is provided inside the connecting plate 70.
．． It has 60 retaining grooves 72,72.

As in the prior art, pivot support members 10.50 for pivotally supporting the arm members 20a, 20b in a parallelogram shape are disposed at both upper and lower ends of the arm members 20a, 20b.

Of these two pivot members, the lower pivot member 10 has a structure as shown most clearly in FIG.
The stand 10 has a hole 19 into which the rod 10b installed upright is loosely fitted, and the rod 10b is loosely fitted into the hole 19.
A base 12 is arranged on a to be rotatable around the rod 10 b, and plates 13 and 13 are fixed to both sides of the base 12.
It has

And, on the inside upper part of this board 13.13, there is an arm member 2.
Notches 15 for inserting both lower end sides of 0a and 20b
is provided, and when fixing this board 13.13 to the base 12, the pin 11.11.11.11 is attached to the arm member 20.
The lower pin holes 21.21.21.21 of a and 20b are inserted into the pin holes 16, 16, 16.16 of the iron plate 13.13, and both arm members 20a and 20b are inserted into the pin holes 11.
11, 11. It is configured to be rotatable around 11 as an axis.

Note that both arm members 20 a and 20 having the shapes described above
Since b is suitable for extrusion molding, the bottle holes 2 at the upper and lower ends of b are suitable for extrusion molding.
1 is the extruded arm member 2.
It is economical to manufacture by connecting the end members 23 having both side parts provided with separate bottle holes 21 at the ends of 0 a and 20 b.

In addition, 17 in Fig. 2 is a fixing screw of the panel 13.
4 and is screwed into the screw hole 18 of the base 12.

On the other hand, the upper pivot member 50 of both arm members 20 a , 20 b has the same mechanism as the lower pivot member 10 for pivotally supporting both arm members 20 a , 20 b. , a base 52 corresponding to the aforementioned base 12 is rotatably connected to plates 53 and 54 corresponding to the aforementioned plates 13 and 13.

That is, in the upper side pivot member 50, as most clearly shown in FIG.
．． One panel 53 of 54 has screw tubes 56 b and 56 b inserted into the hollow portion 52 a erected, and the other panel 5
4 has screws 57, 5 in this screw tube 56b, 56b.
7, and the base plate 52 is rotatably held between the plates 53 and 54.

Further, a screw tube 56a is installed in the center of the board 53, and above the screw tube 56a is arranged a spring disk 55 whose peripheral part is placed on the base 52, and this spring disk 55 has an adjustment screw. The pressing force against the base plate 52 can be adjusted by screwing the screw foot 59 back and forth into the screw cylinder 56a.

Furthermore, a coil spring 58 is hung between the iron plate 53 and the base 52 so that the weight of the second arm 80 and the lamp 90 can be supported by the coil spring 58.

Note that 55 a and 55 b in FIG. 8 are holes for passing the threaded feet of the adjusting screw 59 arranged on the spring disk 55 and the threaded cylinder 56 b.

As in the conventional case, a weight-supporting spring 33 is suspended between the arm members 20a and 20b.

In this embodiment, a hook portion 32 is provided in one side arm member 20 a, and a hook post 31 is provided in a row in the other side arm member 20 b, and the hook is hung between the hook portion 32 and the hook post 31. The spring 33 is omitted so that it is housed inside the arm member 20a on one side.

Further, in both arm members 20a and 20b, a friction table 43 having a U-shaped cross section and connected to the one arm member 20a with its concave portion facing parallel to the one arm member 20a side. , this friction table 43 is placed on the friction table 43.
A plate spring 44 placed so as to bridge the tops of the side walls 43a and 43b, and a presser piece 45 placed on the plate spring 44 and in contact with the central part of the plate spring 44 are housed. The holding piece 45 is inserted from the outside of the other arm member 20b into the hole 22 of the other arm member 20b, the elongated hole 43d arranged in the back 43e of the friction table 43, and the leaf spring 44.
The plate spring 44 is screwed into the threaded foot of the adjustment screw 49 passing through the hole 44a, and the pressing force with which the leaf spring 44 is pressed against the friction table 43 can be adjusted by screwing the adjustment screw 49 and the presser piece 45 back and forth. be.

The friction table 43 and the arm member 20a on one side are connected so that the distance between them can be changed. One end of the cylindrical portion 43C of the friction table 43 is loosely fitted into the
Although they are slidably connected using the shaft 41 as a guide, they may be connected via a link or the like, different from the illustrated example.

The reason why the holding piece 45 is arranged so as to be in contact with the central part of the leaf spring 44 is to effectively utilize the elasticity of the leaf spring 44, and when the leaf spring 44 is pressed as shown in FIG. The plate spring is curved as shown by the chain line and comes into line contact with the friction table 43 to maintain smooth frictional sliding.

Note that 80 is a second arm connected to the base 52, and a lamp 90 is connected to the tip thereof.

In this embodiment, the second arm 80 is composed of one rod, and as in the conventional case, the second arm 80 is also composed of a single rod.
The lighting stand arm of the present invention, which may be composed of two arm constituent members as in the case of 0, has the above-described structure. The force and the frictional force generated between the friction table 43 and the leaf spring 44 are added.

The frictional force between the arm members 20 a and 20 b provided in addition to the spring 33 can be coped with even if there is a change in weight that cannot be covered by the spring 33 alone. can be held accurately and reliably at any desired angle.

Further, in this case, since the frictional force between both arm members 20a and 2Ob is generated without using the pivot member 10.50, the structure of the pivot member 10.50 is simple, and especially the upper pivot member The material 50 can be used only to receive the weight of the second arm 80, and the reaction force against the weight of the first arm 20 and the second arm 80 can be divided and adjusted at various locations.

Furthermore, the above-mentioned arm constituent members 20a, 20 of the present invention
Since the frictional force between the arm members 20a and 20b is based on the pressing force of the leaf spring 44, accurate and fine adjustment can be made.
, 20b can be smoothly slid by friction when changing the inclination angle.

In particular, since the contact between the leaf spring 44 and the friction table 43 is made by line contact, a stable frictional force can always be obtained even after long-term use, which prevents wear.

This has practical effects such as no effect on frictional force due to deformation or the like.

[Brief explanation of drawings]

Figure 1 is a front view of a lighting stand using the proposed lighting stand arm, Figure 2 is an exploded perspective view of the lower pivot part, and Figure 3 is a front view of a lighting stand using the proposed lighting stand arm.
The figure is a vertical sectional view of the lower part of the arm, Figure 4 is a cross-sectional view of the arm, Figure 5 is a vertical sectional view of the upper part of the arm, Figure 6 is an exploded view of the main parts of the part shown in Figure 5, and Figure 7 is an open view. Partial sectional view, FIG. 8 is a sectional view of the upper pivot. 20a, 20b...arm member, 10.
50... Pivotal support member, 22... Hole, 33
...Spring, 43...Friction table, 4
3e... Back, 43 b... Side wall, 4
3d... Long hole, 44... Leaf spring, 44
a...hole, 45...presser piece.

Claims (1)

[Claims for Utility Model Registration] A pair of arm members 20 a and 20 b each having a substantially U-shaped or U-shaped cross section are disposed opposite each other so that their concave portions face each other, and both arm members 20 Pivot support members 10.50 for pivotally supporting the arm members 20a, 20b in a parallelogram shape are disposed at both upper and lower ends of a, 20b, and
In a lighting stand arm in which a weight-supporting spring 33 is suspended between both arm members 20a and 2Ob, there is a U-shaped cross section between the arm members 20a and 20b, with the concave portion on one side. This friction table 4 is mounted on a friction table 43 which faces the arm member 2Oa side in parallel and is connected to the arm member 20a on one side so that the opposing interval can be changed.
A plate spring 44 placed so as to bridge the tops of the side walls 43 a and 43 b of No. 3, and a presser piece 45 placed on the plate spring 44 and in contact with the center part of the plate spring 44 are housed, The holding piece 45 is inserted into the hole 22 of the other arm member 20b and the friction table 4 from the outside of the other arm member 20b.
The lighting stand arm is screwed into the threaded foot of an adjustment screw 49 which passes through a long hole 43d arranged in the back part 43e of No. 3 and the hole 44a of the leaf spring 44 so as to be able to move forward and backward.