JP3699546B2 - Down swing cage with needle removal mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swing-down cage that suspends and supports a swing-down mechanism for checking the verticality of a construction part with respect to a horizontal plane and aligning a ground mark in a construction work, and in particular, a needle removal mechanism for a fixing stop needle For things with
[0002]
[Prior art]
As one type of swing-down cage, there is a case in which a stop needle is provided in a case so as to protrude and retract, and can be fixed to a wooden pillar of a building by the insertion of the stop needle. This type of downward swing retainer is configured to pull out the stop needle from a wooden pillar or the like by pulling the rear part of the needle handle protruding from the back surface of the case after the completion of the vertical swinging operation by the downward swing. However, in order to firmly fix the swing-down cage, it is necessary to pierce the stop needle sufficiently. Therefore, when pulling out, the needle handle must be pulled with a considerable force. Therefore, in practice, the operator does not take such a method, and often pulls it out by a more comfortable method, that is, by squeezing the case from side to side. It was necessary to exchange.
[0003]
Therefore, in recent years, a swing-down cage has been developed that has a needle pulling mechanism for easily pulling out the stop needle without pulling the needle handle with force or twisting the case. An example is disclosed in Japanese Patent Application Laid-Open No. 7-190781. This swing-down cage is provided with a swingable handle at the bottom of the case, and the stop needle inserted into the wood or the like is pulled out by the lever action of the handle with the shaft in the case as a fulcrum. Is.
[0004]
[Problems to be solved by the invention]
However, since the swing swing cage described in the above publication gives the lever action of the handle with the shaft in the case as a fulcrum, the handle has a shape that protrudes long from the bottom of the case. There is a problem that the overall size becomes large, a large space is required for storage in a tool box or the like, and it is inconvenient to carry.
[0005]
The present invention has been made under the circumstances as described above, and the technical problem thereof is that in the downward swing cage that is fixed to a counterpart wood or the like with a stop needle, the stop needle is easily provided. In addition, the size of the entire swing-down cage is prevented from being increased by the mechanism for the extraction.
[0006]
[Means for Solving the Problems]
The technical problem described above can be effectively solved by the present invention.
That is, the downward swing retainer equipped with the needle pulling mechanism according to the present invention is housed in a case containing a reel for winding the downward swing yarn so as to be movable in a direction substantially perpendicular to the mounting surface, and the needle body at the tip is the aforementioned In the downward swing holder having a stop needle protruding from the mounting surface and having a rear needle handle protruding from the back surface of the case, the case is accommodated in the case so as to be movable in a direction substantially parallel to the stop needle. A rack plate whose head projects from the back surface, a first gear portion meshing in a moving direction with a rack-like tooth portion formed on the needle handle, and a rack-like tooth portion formed on the rack plate And a link member formed with a second gear portion that meshes in the moving direction. The link member is rotatably provided around an axis that is unevenly distributed on the first gear portion side. Here, the “rear surface” refers to a surface facing away from the mounting surface.
[0007]
In the present invention, when the swinging cage is fixed to a wooden column or the like, the stop needle is fixed to the wooden of the building by pressing the head of the needle handle protruding from the back of the case with a hand or hitting it with a mallet or the like. Insert it into a pillar. At this time, the link member is rotated by the forward movement of the stop needle in the insertion direction, the rack plate is moved backward through the link member, and the rear end portion protrudes from the back surface of the case.
[0008]
When pulling out the stop needle once inserted, the rear end of the rack plate protruding from the back of the case is pushed toward the case. Then, as the rack plate moves, the link member rotates in a direction opposite to that when the stop needle is inserted, and the stop needle is moved backward via the link member and pulled out from the wooden column or the like. In addition, since the rotation axis of the link member is unevenly distributed on the first gear part side, the force of the force having the first gear part as an action point, the second gear part as a power point, and the rotation axis as a fulcrum. By the moment, the stop needle can be easily pulled out by lightly pushing the rack plate.
[0009]
In the present invention, more preferably, the rack plate is urged toward the inside of the case by the urging means via the link member. In this way, the rack plate is held in the case when not in use.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view of the internal structure showing a preferred embodiment of a downward swing cage equipped with a needle pulling mechanism according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II ′ in FIG. Reference numeral 10 denotes a case in which a screw (not shown) screwed into each of a plurality of screw holes 11 is combined symmetrically in a direction perpendicular to the illustrated surface, that is, in FIG. 1, the inside is exposed by removing one case. This shows the state that has been caused.
[0011]
Reference numeral 20 is housed in the case 10 and is rotated around a shaft 21 formed on the case 10 to take up the lowering yarn 1. The reference numeral 20 is provided in a space between the reel 20 and the shaft 21. A spiral spring that lowers the reel 20 in the winding direction of the swing yarn 1. The swung yarn 1 meanders from the outer periphery of the reel 20 so as to contact some of the plurality of yarn hooking pins 12 (12 _{1 to} 12 ₈ ) arranged in the case 10, and It is led out to the outside of the case 10 through the yarn outlet 13a of the attached lid member 13, and the weight body 2 (see the use state in FIG. 4) is connected to the end portion thereof.
[0012]
Of the thread hook pins 12 _{1 to} 12 ₈ , two thread hook pins 12 ₄ and 12 ₅ are provided on the adjustment knob 14, and the adjustment knob 14 can be rotated within a predetermined angle range with respect to the case 10. It is provided in the state. That is, by rotating the adjusting knob 14 from the outside of the case 10 by an arbitrary angle, the thread hook pins 12 ₄ and 12 ₅ are also rotated, and the lowering thread 1 between the thread hook pins 12 _{3 to} 12 _{6 is} rotated. Since the meandering angle changes, the frictional resistance with respect to the lowering yarn 1 can be increased or decreased thereby, and the hanging length of the lowering yarn 1 can be adjusted.
[0013]
A permanent magnet 30 for fixing the case 10 (down swing cage) to a steel pillar in a building is attached to the front mounting surface 10a of the case 10. A stop needle 40 for fixing the (lower swing cage) to a wooden part such as a wooden pillar in the building is accommodated so as to be movable in a direction substantially perpendicular to the mounting surface 10a of the case 10.
[0014]
As shown in the perspective view of FIG. 3, the stop needle 40 includes a needle main body 41 that can project from a small hole 10 b formed in the upper part of the attachment surface 10 a and a needle handle 42 at the rear part. A compression coil spring 43 is disposed in front of the needle handle 42 (on the left side in FIG. 1), and the stop needle 40 normally has the needle main body 41 in the small hole by the urging force of the compression coil spring 43 in the extending direction. The head portion 42 a at the rear end of the needle handle 42 protrudes from the back surface 10 c of the case 10 to the outside while immersing into the case 10 from 10 b. An engaging protrusion 42b is formed on the upper surface of the tip of the needle handle 42 of the stop needle 40, and a rack-like tooth portion 42c and a plurality of engaging recesses 42d are formed on the lower surface of the needle handle 42. The engaging protrusion 42b abuts with a stopper 15a on the lower surface of the slider 15 rotatably attached to the upper end surface 10d of the case 10 when the stop needle 40 is in the retracted position shown in FIG. The stopper needle 40 is prevented from falling off from the inside.
[0015]
A rack plate 50 is accommodated in the lower part of the case 10 so as to be movable in a direction substantially parallel to the stop needle 40, and a head 51 at the rear end projects from an opening formed in the lower part of the back surface 10 c of the case 10. It is supposed to be sunk. A rack-like tooth portion 52 is formed on the upper surface near the tip of the rack plate 50.
[0016]
In the case 10, a link member 60 formed with a first gear portion 61 that meshes with the rack-like tooth portion 42 c of the stop needle 40 and a second gear portion 62 that meshes with the rack-like tooth portion 52 of the rack plate 50. Is disposed between the retaining needle 40 and the rack plate 50. The link member 60 is rotatably attached to the case 10 via a pin shaft 63 at a portion near the first gear portion 61, and the timepiece shown in FIGS. 1 and 4 by a tension coil spring 65 as an urging means. Pulled and biased in the surrounding direction. Both the first gear portion 61 and the second gear portion 62 are formed along a circumference around the pin shaft 63. The link member 60 is provided with an arc-shaped long hole 64 for avoiding interference with the shaft 21 or the like supporting the reel 20.
[0017]
On the outer peripheral side of the pin shaft 63 on the inner side surface of the case 10, a circumferential bearing portion 16 centering on the axial center of the pin shaft 63 is formed. An annular step surface 66 formed in a step shape in a circumferential shape around the shaft hole is fitted on the outer peripheral side of the shaft hole so as to be slidably rotatable. That is, the link member 60 is rotatably supported around the pin shaft 63 by the bearing portion 16.
[0018]
A lock member 17 is slidably provided below the protruding position of the needle handle 42 on the back surface 10 c of the case 10. An upper end portion 17 a of the lock member 17 is engaged with the lower surface of the needle handle 42. The stop needle 40 can be fixed by being inserted into and engaged with the recess 42d.
[0019]
In the downward swing cage having the above-described configuration, the rack plate 50 for a needle pulling operation, which will be described later, is usually provided in the case when the stop needle 40 is in the retracted position and the needle body 41 is immersed in the case 10. It is in the state accommodated in 10. Since the stop needle 40 is urged in the backward direction by the compression coil spring 43, the needle body 41 does not accidentally jump out of the case 10, but the engagement recess 42d between the lock member 17 and the needle handle 42 is provided. It is safer if the stop needle 40 is locked in the retracted position by the engagement with. Further, in this state, the link member 60 in which the first gear portion 61 is not substantially meshed with the rack-like tooth portion 42c of the needle handle 42 is urged in the clockwise direction in FIG. Therefore, the rack plate 50 is also held in the storage position shown in FIG. 1 through the meshing portion between the second gear portion 62 and the rack-like tooth portion 52.
[0020]
In the vertical measurement operation by swinging down, when the mounting counterpart surface is made of a steel frame or the like, by the magnetic attraction force of the permanent magnet 30, and when it is made of wood, by the insertion of the stop needle 40, At a predetermined height. FIG. 4 shows a state in which the wooden pillar 3 is fixed by inserting a stop needle 40. That is, when the needle body 41 of the stop needle 40 is inserted into the wooden pillar 3 by pressing or striking the head portion 42a of the needle handle 42 protruding from the back surface 10c of the case 10, the rack-like tooth portion 42c of the needle handle 42 is obtained. Is displaced, and the link member 60 is rotated counterclockwise around the pin shaft 63 by the first gear portion 61 meshed with the first gear portion 61. The rack plate 50 meshing with the second gear portion 62 moves backward, and the head portion 51 projects from the back surface 10 c of the case 10. In the attached state, the vertical measurement work is performed by unwinding the downward swing yarn 1 with the weight body 2 attached thereto from the yarn outlet 13a to the lower side of the case 10 and drooping vertically.
[0021]
When removing the swing-down cage from the wooden pillar 3 after the measurement is completed, it is only necessary to push the head 51 of the rack plate 50 protruding from the back surface 10 c of the case 10 into the case 10. That is, when the head portion 51 of the rack plate 50 is pushed into the case 10, the link member 60 that meshes with the rack-like tooth portion 52 of the rack plate 50 in the second gear portion 62 is centered on the pin shaft 63. Since it rotates in the clockwise direction, a backward load acts on the handle 42 of the stop needle 40 via the meshing portion of the first gear portion 61 and the rack-like tooth portion 42c. The pull-out load F _{2 at} this time is a radius r _{1 of} the first gear portion 61 serving as an action point and a second force serving as a power point with the center of the bearing portion 16 corresponding to the rotational axis of the link member 60 as a fulcrum. The moment of force given in relation to the radius r ₂ of the gear part 62;
F ₁ · r ₂ = F ₂ · r ₁
Thus, the pushing load 40 is much larger than the pushing load F ₁ on the rack plate 50, so that the stop needle 40 can be easily pulled out with a small pushing force, whereby the swinging cage is removed from the wooden column 3.
[0022]
The present invention is not limited to the illustrated embodiment. For example, various shapes of the stop needle 40, the rack plate 50, the link member 60, and the like are conceivable, and as a means for urging the link member 60 in the clockwise direction in FIGS. Depending on the mounting position, for example, a compression coil spring or a torsion spring can be used.
[0023]
【The invention's effect】
According to the downward swing cage having the needle pulling mechanism according to the present invention, the following effects are realized.
(1) The swinging cage fixed by inserting the stop needle can be easily removed because the stop needle is pulled out simply by pushing the rack plate into the case with a light force.
(2) Normally, since the rack plate for pulling out the stop needle is housed in the case, the storage space for the swing-down cage in the tool box or the like does not become large and is easy to carry.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an internal structure showing a preferred embodiment of a downward swing cage equipped with a needle pulling mechanism according to the present invention.
FIG. 2 is a cross-sectional view showing the downward swing cage provided with the needle pulling mechanism of the above embodiment cut along the line II-II ′ of FIG.
FIGS. 3A and 3B show a stop needle in a downward swing cage equipped with a needle pulling mechanism according to the embodiment, together with a coil spring. FIG. 3A is a perspective view seen from obliquely above, and FIG. It is a perspective view.
FIG. 4 is an explanatory diagram of an internal structure showing a usage state of a swing-down cage provided with the needle pulling mechanism of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lowering thread 2 Weight body 10 Case 10a Mounting surface 10c Back surface 20 Reel 40 Stop needle 41 Needle main body 42 Needle handle 42c Rack-like tooth part 50 Rack plate 52 Rack-like tooth part 60 Link member 61 First gear part 62 Second Gear part 63 Pin shaft (shaft)
65 Tension coil spring (biasing means)

Claims (2)

A case (10) containing a reel (20) that winds down the pendulum thread (1) is accommodated movably in a direction substantially perpendicular to the mounting surface (10a). (10a) In the downward swing retainer having a stop needle (40) whose rear handle (42) protrudes from the back surface (10c) of the case (10).
A rack plate (50) accommodated in the case (10) so as to be movable in a direction substantially parallel to the retaining needle (40) and having a rear end head portion (51) projecting and retracting from the back surface (10c);
A first gear portion (61) meshed in the moving direction with a rack-like tooth portion (42c) formed on the needle handle (42) and a rack-like tooth portion (52) formed on the rack plate (50). And a link member (60) formed with a second gear portion (62) meshing in the moving direction thereof,
The link member (60) is a swing-down cage having a needle pulling mechanism, wherein the link member (60) is rotatably provided around a shaft (63) that is unevenly distributed on the first gear portion (61) side. In the description of claim 1,
The rack plate (50) is urged toward the inside of the case (10) through the link member (60) by the urging means (65). .

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