JPS6319764Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of plumb bob, and in particular, in plumb bob, which automatically retracts the hanging string into the casing when the heavy weight load is released, heavy weights of different weights can be attached with one touch. The purpose is to provide a plumb bob that can be used selectively.

Conventionally, many types of automatic rewind-type plumb bob locks have been used in which the unfed hanging cord is locked at the unwinding part, but if the locking device comes off during use, the heavy hanging cord will be quickly caught up, resulting in a very dangerous situation. This is dangerous, and some structures have been devised in which the hanging cord is housed inside the container when the heavy weight is removed. However, this type of device maintains stability by balancing the load of the spiral spring that drives the take-up drum, the weight of the weight, and the frictional resistance of the feeding section, so it has the disadvantage that it becomes unusable if the weight of the weight is changed. It was hot.

The present invention was developed in view of the above problem, and has a structure in which the resistance friction force of the feeding part is varied through a plurality of pins, and the vertical positional relationship of the pins can be adjusted by rotating the pins from outside the container. The structure is such that it can be varied depending on.

Hereinafter, one embodiment of the plumb bobbin of the present invention will be described with reference to the drawings. Figure 1 is a front view with one side of the casing removed. A winding drum 4 having a bobbin winding tube 4a fixed to the outer end of the spiral spring 3 through a spiral spring 3 having an inner end fixed is rotatably pivoted to the fixed shaft 2, and is used for winding. A hanging cord 5 whose inner end is connected to a part of the drum 4 is wound in the direction in which the spiral spring 3 tightens, and the outer end is connected to the outlet of the container casing 1 via the hanging cord feeding resistance adjustment mechanism section 6. 7, and an inverted cone-shaped heavy weight 8 is connected to the end thereof. The suspension string unwinding resistance adjustment mechanism section 6 includes a first fixing pin 9 located near the outlet of the winding drum 4 and a second fixing pin 10 located near the outlet of the winding drum 4.
It also consists of two movable pins 13 and 14, which are located between both the fixed pins and spanned between the shaft member 12 of the rotation adjuster 11, which is pivoted to the side plate 1a of the housing. One end of the shaft member 12 has a cylindrical shape,
It is rotatable with respect to the shaft hole of the side plate 1a, and the other end has a small engaging protrusion 1 projecting in the outer circumferential direction.
5, 15... are equally distributed, and the small protrusions 15 are located on the side plate 1a.
When the shaft member 12 is fitted into the engagement recesses 16, 16, . Engagement protrusion 15
is removed from the engagement recess 16 and becomes free to rotate, and by rotating this, the positions of the movable pins 13 and 14 can be changed, and an index 18 is engraved on the end surface of the shaft member 12. and indicates the selected position of the load scale 18a marked on the side plate 1a.

Reference numeral 19 in the figure is a wooden attachment mechanism, in which the rear end of a sliding shaft 21 with a prick pin 20 fixed to its tip protrudes from one end of the cabinet 1, and is always elastically biased rearward by a coil spring 22. When the sliding shaft is pressed, the prick pin 20 protrudes from the prick pin hole 23 provided in the mounting surface 1b. Furthermore, mounting surface 1b
is provided with a notch 24 for attaching a thin part such as an aluminum sash and a permanent magnet 25 for attaching a magnetic body part, and a guide pin 26 is provided upright at the end of the attachment surface 1b at the bottom of the housing 1, and the outlet 7 It can be passed through when the hanging cord 5 let out from the holder is led out along the mounting surface 1b.

The plumb bob having the above structure is used by adjusting the suspension string feeding resistance adjustment mechanism 6 according to the weight of the weight 8 used, and by rotating the rotation adjuster 11, As shown in FIG. 5, the positional relationship between the first fixed pin 9, the second fixed pin 10, and the two movable pins 13 and 14 changes, and as shown in FIG. From the position where the frictional resistance force is minimum, where it has no relation to the movable pins 13, 14, the amount of friction area is changed by changing the winding angle of the fixed pins 9, 10 and the movable pins 13, 14 as shown in FIGS. 4 and 5. The frictional resistance varies depending on the difference in position. Therefore, by determining in advance the hanging load of the heavy weight 8 that is appropriate for each position, the rotation adjuster 11 can be set to the adjustment position of the suspension string feeding resistance adjustment mechanism 6 that matches the load of the heavy weight 8. The winding drum 4 can be selected by simply pulling the heavy weight 8.
The suspension string 5 that is let out against the spiral spring 3 is caused by the load of the weight 8 and the frictional resistance between the four pins of the suspension cord pay-out resistance adjustment mechanism 6 and the suspension cord 5.
It balances the elastic force of the ball and stabilizes it in the extended position.

After use, in order to wind the hanging cord 5 into the container casing 1, the load is released by lifting the weight 8, and the frictional resistance of the hanging cord unwinding resistance adjustment mechanism 6 disappears, causing the spiral spring 3 to return to its elastic state. It is wound up on the winding drum 4.

The above example is an example of a plumb bob, but in order to increase the winding amount, multiple gears are combined to increase the winding amount of the hanging cord, and the number of rotations of the end of the spiral spring is controlled. It can also be configured to amplify and transmit data to the drum.

As mentioned above, the plumb bob of the present invention can change the position of the resistance pin of the suspension string payout resistance adjustment mechanism from outside the casing, and this variation changes the route of the suspension cord and changes the frictional resistance. Therefore, the adjustment operation is easy and the heavy weight can be easily changed, and the practical effects of the present invention are extremely large.

[Brief explanation of drawings]

The drawings show an embodiment of the plumb bobbin of the present invention, and Figure 1 is a front view with one side of the casing removed;
FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIGS. 3 to 5 are explanatory diagrams showing the action of the hanging cord drawing-out resistance adjusting mechanism. 1... Instrument housing, 2... Fixed shaft, 3... Spiral spring, 4... Winding drum, 5... Suspension string, 6...
Suspension cord feeding resistance adjustment mechanism section, 7... Outlet port, 8
... Heavy weight, 9, 10 ... Fixed pin, 11 ... Rotation adjuster, 12 ... Shaft member, 13, 14 ... Movable pin, 15 ... Engagement small projection, 16 ... Engagement recess, 1
7...Coil spring, 18...Indicator.

Claims (1)

[Scope of utility model registration request] The inner end of the hanging cord is connected to a winding drum pivotally installed inside the container, and the hanging cord is wound up, and the hanging cord is automatically wound up by elastically biasing a spiral spring in the winding direction. In the unwinding mechanism of the hanging cord, a pivot is provided between the unwinding part of the winding drum and a fixing pin fixed near the outlet of the casing so that it can be fixed at an appropriate rotational position relative to the casing. Two movable pins are erected on the rotation adjuster, and the hanging cord is slidably contacted with the two movable pins and the two fixed pins, and the weight connected to the end of the hanging cord is constructed. 1. A plumb bob comprising a suspension string feeding resistance adjustment mechanism that has a frictional resistance force commensurate with the load against different weights.