JPS622485Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of plumb bob.
It is an object of the present invention to provide a plumb bob that allows a hanging string winding part to be easily attached to a building member or the like.

Now, an example of the implementation of the present invention will be described with reference to the drawings.The plumb bob is provided with a locking mechanism 2 having a hooked end 4 at the tip from one end of the case body 1, and inside the case body 1. A winding mechanism 7 for winding up a hanging cord 6 connecting heavy weights 5 and a stop mechanism 8 for stopping the hanging cord 6 at a desired position are provided.
A fixed shaft 9 is provided approximately at the center of the case 1 and is fixedly installed or integrally formed between the side plates 1a, 1a, and a spring drum 10 and a thread winding drum 11 are independent from the fixed shaft 9. It is pivoted so that it can rotate. The spring drum 10 is elastically biased in one rotation direction by interposing a spiral spring 12 interposed between the cylindrical wall 10a and the fixed shaft 9.
One end of a hanging cord 6, which will be described later, is connected and fixed to one side of the drum portion 11a of the thread winding drum 11. Also 1
Reference numeral 3 denotes an idle gear rotatably mounted on a pivot shaft 14 installed between both side plates 1a, 1a at one corner of the case main body 1, and a small gear 13a of the idle gear 13 and an outer periphery of the spring drum 10 are connected to each other. While meshing the formed flat gear 10b, the large gear 13b
and a flat gear 11b formed on the outer periphery of the bobbin drum 11, and the spring drum 10 and the bobbin drum 11 are rotationally connected at a predetermined ratio via the idle gear 13. The hanging cord 6 wound around the drum portion 11a has its unwound end passed through the stop mechanism 8 and extends out of the case body 1 from the feeding hole 15.
A groove 1b formed on the lower surface of the case body 1 and a positioning pin 1 protruding from one groove side of the groove 1b.
After 6, heavyweight 5 will be suspended.

The locking mechanism 2 includes a sliding plate 3 having a hooked end 4 at its tip slidably inserted into a sliding hole 17 opened at one end of the upper end of the case body 1. is always elastically biased inward of the sliding hole 17 by a coil spring 19 interposed between the locking pin 18 installed between the cut-and-raised protrusion 3a and the side plates 1a, 1a of the case body 1. The stopper 2
The locking pawl 20a of No. 0 comes to engage in the direction of pulling out the sliding plate 3 (arrow A). The stopper 20 has a fulcrum position swingably pivoted to a stopper shaft 21 that is pivoted to the side plate 1a, and is fixed to the operating end of the stopper 20 or integrally formed with the recess 1c formed in the side plate. A leaf spring 23 that loosely fits the push button 22 and has one end fixed to the side plate 1a.
The locking pawl 20a is pressed and elastically biased in the direction of the locking protrusion 3b. Further, a central notch 4a is formed in the center of the hooked end 4 from the lower end, and the hooked end 4 is accommodated in the concave end 1d of the case body 1, and a finger hook projection protrudes into the concave end 1d. 4b is installed protrudingly.

Further, the stop mechanism 8 has one end attached to the arm shaft 24.
Two brake plates 26, 2 in the shape of leaf springs are fixed to the tip of an arm member 25 which is pivotally connected to the brake plate 26, 2.
7 is in sliding contact with a serrated gear 11c formed on the outer periphery of the thread winding drum 11 to regulate the rotation of the thread winding drum 11.
Two via pins 28 and 29 installed between a and 1a
The suspension string 6 between the arms is passed through a via pin 30 erected on the arm member 25, and sliding pressure in the direction of arrow B is obtained. In the figure, reference numeral 31 denotes a permanent magnet for magnetic attraction embedded in the end surface of the case body 1 on the side of the hooked end 4 of the locking mechanism 2.

The plumb bob having the above structure is used by pulling the heavy weight 5 and setting the hanging string 6 to the desired length. When the hanging string 6 is pulled, the bobbin drum 11 rotates and the hanging string 6 is paid out. However, at this time, the spring drum 10 rotates via the idle gear 13, and the spiral spring 12 is elastically biased, so that the sliding contact pressure of the brake plates 26, 27 of the stop mechanism 8 against the sawtooth gear 11c decreases. And, due to the elastic return of the spiral spring 12,
The thread winding drum 11 rotates in a direction to wind up the hanging cord 6 via the spring drum 10 and the idle gear 13, and the pulled out hanging cord 6 is housed in the case body 1. When attaching this plumb bob to a building member, if it is a magnetic material, it is attracted by a permanent magnet 31, but if it is a non-magnetic material, the locking mechanism 2 is used.

The sliding plate 3 is pulled out by hooking the tip of the finger on the finger hook protrusion 4b while pushing the push button 22, and after hooking the hook end 4 to the corner of the attachment part, the push button 22 is released to ensure secure attachment. That is, when the push button 22 is pushed in, the stopper 20 is tilted against the elasticity of the leaf spring 23, and the locking pawl 20a is disengaged from the locking protrusion 3b, so that the sliding plate 3 is freely moved against the elasticity of the coil spring 19. You will be able to pull it out. When the pressing force of the push button 22 is released when the pull-out length is determined, the locking pawl 20a engages with the locking protrusion 3b again due to the elastic return of the leaf spring 23, thereby locking the protrusion of the sliding plate 3. It is something. However, this engagement prevents sliding only in the protruding direction due to the inclined engagement between the locking pawl 20a and the locking protrusion 3b, so when the case body 1 is held and removed from the building member,
The sliding plate 3 automatically returns to its original position due to the elasticity of the coil spring 19, and the hook end 4 is also accommodated within the case body 1.

As explained above, the plumb bob of the present invention has a locking mechanism that is automatically housed in the case body, so it can be attached to and detached from building materials with a single touch, and it can be used by heavy-duty users. The length of the hanging cord can be freely adjusted, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

The drawings show one embodiment of the plumb bobbin of the present invention. Figure 1 is a perspective view, Figure 2 is a front view with one side of the case body removed, Figure 3 is a left side view of the same, and Figure 4. is a cross-sectional view taken along the line -- in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1... Case body, 2... Locking mechanism, 3... Sliding plate, 3b... Locking protrusion, 4... Hook end, 5... Heavy weight, 6... Hanging string, 7... Winding mechanism , 8... stop mechanism, 17... sliding hole, 19... coil spring, 20... stopper, 22... push button, 23...
...plate spring.

Claims (1)

[Scope of utility model registration request] A sliding hole is formed on one side of the body of the plumb bob case, which has a built-in drum for winding a thread that can be adjusted to the desired length by winding a hanging string with a heavy weight connected to the tip.
A sliding plate with a hooked end is inserted into the sliding hole and elastically biased in the accommodation direction via a coil spring, and a sawtooth locking protrusion formed on one side of the sliding plate and the case body A plumb bob characterized by being provided with a locking mechanism that selectively engages a locking pawl of a stopper pivotally mounted on the holder to restrict sliding in the projecting direction.