JP4064497B2 - Sealing material injection gun - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to an improvement of an injection gun for injecting a sealing material into a joint portion such as a building material in order to achieve waterproofing and adhesion.
[0002]
[Prior art]
Although this type of conventional injection gun is not specifically shown, a base frame that supports a long guide rod so as to be able to move forward and backward, a handle that is provided on the base frame and applies forward force to the guide rod, A holding cylinder, which is detachably attached to the base frame and accommodates a sealing material therein, has a configuration in which a metal piston for extruding a sealing material having a plate shape is fixed to the front end portion of the guide rod.
[0003]
In actual use, until now, a cylindrical cartridge filled with a sealing material is accommodated in the holding cylinder, and the holding cylinder is attached to the base frame side. When the rod is advanced, the metal piston fixed to the front end of the guide rod interlocks and presses the bottom of the cartridge, so that the sealing material is pushed out from the front end opening side of the cartridge, and building materials, etc. It will be injected into the junction.
[0004]
[Problems to be solved by the invention]
Therefore, at least when a cartridge type sealing material is targeted, there is no inconvenience in use. However, this cartridge type sealing material inevitably increases the cost. In particular, when discarded after use, the empty cartridge itself becomes bulky, and at present, there is a tendency to provide a large number of sealing materials filled in easily deformable film packs.
However, if this film pack type sealing material is used as a target under a conventional injection gun, the following inconvenience is caused.
[0005]
In other words, the conventional injection gun is intended only for cartridge-type sealing materials, and a considerable clearance (at least the thickness of the cartridge body) is positively provided between the peripheral edge of the metal piston and the inner wall surface of the holding cylinder. As in the case of the cartridge, when the film pack is stored inside the holding cylinder and the rear end side of the film pack is pressed with a metal piston, the clearance is reduced in the pressing process. The rear end side of the film pack is gradually swallowed between the peripheral edge of the metal piston and the inner wall surface of the holding cylinder, and a large force is required for the handle operation, or the swollen state Depending on the situation, there is a possibility that the steering wheel cannot be operated after that, and it may become unusable.
[0006]
For this reason, in this field, the emergence of an injection gun optimal for a film pack type sealing material that is inexpensive and easy to dispose of is particularly desired.
[0007]
[Means for Solving the Problems]
The present invention has been developed to meet such a demand. The invention according to claim 1 is a base frame that supports the guide rod so as to be able to advance and retract, and a forward force applied to the guide rod provided on the base frame. A sealing material having a handle to be attached and a holding cylinder that is detachably attached to the base frame and stores a film pack filled with a sealing material therein, and a piston for sealing material extrusion is fixed to the front end portion of the guide rod In this injection gun, the piston is integrally formed of an elastic material rich in oil resistance, heat resistance, and wear resistance, and the front half facing the sealing material of the piston has an annular notch having a substantially V-shaped cross section. A thin annular flange wall is provided on the outer side with a void in between, a frustoconical raised wall is provided on the inner side, and a caulking metal fitting for the film pack is stored in the center of the front surface of the raised wall. The storage chamber is formed, and, to form a cyclic longitudinal groove to encourage bending the base portion of the annular flange wall of the annular flange wall, adopting the configuration of adhering thin annular flange wall to the inner wall surface of the holding tube did.
[0009]
Therefore, according to the first aspect of the present invention, the piston is formed of an elastic material rich in oil resistance, heat resistance and wear resistance. The piston itself can be prevented from easily degrading, and when the sealing material is pressed, the reaction force can be used to bring the front peripheral edge of the piston into close contact with the inner wall surface of the holding cylinder. In contrast, the rear end side of the film pack filled with the sealing material can be effectively prevented from being caught between the piston and the holding cylinder. In addition to this, since the thin annular flange wall is provided outside the front half of the piston, the deflection is obtained and the front peripheral edge of the annular flange wall is securely adhered to the inner wall surface of the holding cylinder. In addition, the rear end side of the film pack can be uniformly pressed in cooperation with the frustoconical raised wall provided inside the front half of the piston.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, if the present invention is described in detail based on a preferred embodiment illustrated, the injection gun according to the embodiment is mainly developed for a film pack type sealing material, Basically, as shown in FIG. 1, a base frame 1 that supports a long guide rod 9 so as to be able to move forward and backward, and handles 5, 6 that are provided on the base frame 1 and apply forward force to the guide rod 9. And a holding cylinder 11 that is detachably attached to the base frame 1 and accommodates a sealing material therein, and a piston 16 for sealing material extrusion is fixed to the front end portion 9a of the guide rod 9. .
[0012]
Specifically, the base frame 1, which is the main body of the gun, has through holes in the front and rear walls 2a and 2b, and the long guide rod 9 is moved forward and backward in the front and rear through holes. The feed lever 3 having the insertion hole 3a of the guide rod 9 is provided in the air space between the front and rear walls 2a and 2b, and the lock having the insertion hole 4a of the guide rod 9 is also provided outside the rear wall 2b. A lever 4 is provided, and each of the levers 3 and 4 is fitted on the guide rod 9 at that position, while a fixed handle 5 integrally extended to the lower side and a movable pivotally supported on the lower side. The handle 6 is disposed opposite to the handle 6. Both the feed lever 3 and the lock lever 4 are individually repelled in the backward direction of the guide rod 9 by the spring pressure of the coil springs 7 and 8.
[0013]
Therefore, when the feed lever 3 is advanced while being tilted against the spring pressure of the coil spring 7 by the opening / closing operation of the movable handle 6 with respect to the fixed handle 5, the hole edge of the insertion hole 3 a is formed on the outer peripheral surface of the guide rod 9. At the same time as the guide rod 9 is moved forward by pressure contact, the hole edge of the insertion hole 4 a on the lock lever 4 side is pressed against the outer peripheral surface of the guide rod 9 by the spring pressure of the coil spring 8, and the guide rod 9 is returned backward. On the contrary, when the lock lever 4 is pressed against the rear wall 2b side of the base frame 1 against the spring pressure of the coil spring 8, and the pressure contact of the hole edge of the insertion hole 4a with respect to the guide rod 9 is released, The guide rod 9 is allowed to retract.
[0014]
In addition, the holding cylinder 11 for storing the sealing material therein is formed with a base part 12 fitted to the cylindrical bracket 10 provided on the front wall 2a of the base frame 1 on the rear end side, and on the front end side. The cap 13 is formed so as to be fitted to the cylindrical cap 15 provided in the injection nozzle 14.
Therefore, if the cylindrical cap 15 is fitted to the front end cap portion 13 of the holding cylinder 11 and the rear end cap portion 12 is fitted to the cylindrical bracket 10, the holding cylinder 11 to which the injection nozzle 14 is connected becomes the base frame 1. At the same time, the guide rod 9 is freely moved forward and backward within the holding cylinder 11.
[0015]
And in this embodiment, on the premise of such a configuration, the piston 16 fixed to the front end portion 9a of the guide rod 9 is made of an elastic material rich in oil resistance, heat resistance and wear resistance, for example, By molding with synthetic rubber such as nitrile rubber, natural rubber, soft synthetic resin, etc. and utilizing the elasticity of the piston 16 itself, unnecessary clearance is generated between the inner wall surface of the holding cylinder 11. It is definitely something to prevent.
[0016]
Specifically, the piston 16 made of the elastic material is formed into a disk shape in which the insertion hole 17 of the guide rod 9 is opened at the center as shown in FIGS. An annular notch void 18 having a substantially V-shaped cross section is formed from the front side toward the inside of the front half facing the sealing material, and a relatively thin wall is formed outside the annular notch void 18. An annular front flange wall 19 is provided, a right frustoconical raised wall 20 is provided inside the annular notch cavity 18, and a caulking metal fitting storage chamber 21 communicating with the insertion hole 17 at the center of the raised wall 20; The nut storage chamber 22 is formed continuously in a stepped shape, and an annular vertical groove 23 is formed at the base of the annular front flange wall 19 to facilitate bending of the flange wall 19.
[0017]
Further, for the rear half portion that does not face the sealing material, an annular notch cavity portion 24 having a substantially U-shaped cross section is formed from the rear surface side toward the inside, and the outer side of the annular notch cavity portion 24 is formed. An annular rear flange wall 25 thicker than the front flange wall 19 is provided, and a right truncated cone side wall 26 defining the insertion hole 17 is provided inside the annular notch cavity 24. .
[0018]
Under the present embodiment, the end outer diameter L1 of the annular front flange wall 19 and the annular rear flange wall 25 is set to be slightly larger than the inner diameter L2 of the holding cylinder 11, and the front and rear flanges are set. The outer diameter of the portion connecting the walls 19 and 25 is set so as to be slightly smaller than the inner diameter L2 of the holding cylinder 11 by positively imparting a concave shape, but the present invention is limited to this. Instead, the outer end diameter L1 of the annular front flange wall 19 and the rear flange wall 25 can be set to be equal to or slightly smaller than the inner diameter L2 of the holding cylinder 11.
[0019]
When the piston 16 is fixed to the guide rod 9, a mounting metal plate 29 having a cross-sectional Ω shape is formed on the front end portion 9 a on which the thread surface of the guide rod 9 is formed via a nut 27 and a spring washer 28. While the nut 30 is housed in the housing chamber 22 formed in the front half, and then the mounting metal plate 29 is closely faced in the annular cutout cavity 24 in the rear half, If the piston 16 itself is rotated and the nut 30 in the storage chamber 22 and the front end portion 9a of the guide rod 9 are screwed together and tightened, the piston 16 is thereby dropped to the front end portion 9a of the guide rod 9. It will be securely fixed. In this case, since the storage chamber 22 of the nut 30 has a hexagonal shape, there is no fear that the nut 30 in the storage chamber 22 rotates together.
[0020]
Therefore, when injecting a sealing material into a joint portion such as a building material using the injection gun having such a configuration, as shown in FIG. 4, a film pack 31 in which both end portions 31a are sealed by welding as shown in FIG. Although not specifically shown, the front end side of the film pack 31 is opened to an appropriate size, and the film pack 31 is held in a state where the opening is located on the injection nozzle 14 side. If the rear end cap 12 of the holding cylinder 11 is fitted to the cylindrical bracket 10 of the base frame 1 in this state, it can be used immediately.
[0021]
When the movable handle 6 is opened / closed with respect to the fixed handle 5 while gripping the handles 5 and 6, the above-mentioned pressure contact action of the feed lever 3 is obtained, and the guide rod 9 moves forward intermittently. In conjunction with this, the piston 16 also advances in the holding cylinder 11 and, as shown in FIG. 5, the film pack 31 in the holding cylinder 11 is operated by the action of the annular front flange wall 19 and the raised wall 20 having a right circular truncated cone shape. Since the rear end side is uniformly pressed, the sealing material filled in the film pack 31 is pushed out from the front end opening through the injection nozzle 14 to join the building material (not shown). Injected into. In this case, the shape of the right truncated cone of the raised wall 20 greatly affects the pressing of the film pack 31.
[0022]
However, in such a pressing process, the annular front flange wall 19 of the piston 16 moves forward in an elastic contact with the inner wall surface of the holding cylinder 11 by utilizing the difference in diameter from the holding cylinder 11. Unlike the conventional case, the rear end side of the film pack 31 is squeezed between the piston 16 and the holding cylinder 11 to operate the handles 5 and 6. It can be effectively prevented that a large force is required, or that the steering wheel 5 or 6 cannot be operated afterward depending on the squeezed state, and it becomes unusable.
[0023]
In addition, under the present embodiment, the annular front flange wall 19 of the piston 16 is set to be slightly larger than the inner diameter L2 of the holding cylinder 11, so that the contact state with the inner wall surface of the holding cylinder 11 can be achieved. Needless to say, in the process of moving forward, in addition to the raised wall 20 in the shape of a right truncated cone, the rear end side of the film pack 31 is also pressed at the front peripheral edge of the annular front flange wall 19. Even with this reaction force, expansion of the annular front flange wall 19 is effectively promoted, and the close contact state of the front peripheral edge becomes more reliable.
For this reason, even if the annular front flange wall 19 of the piston 16 is equal to or slightly smaller than the inner diameter L2 of the holding cylinder 11, the annular front flange wall 19 can be obtained only by using the above reaction force reasonably. Can be expanded with the help of the annular longitudinal groove 23, so that the close contact state of the front peripheral edge can be ensured.
[0024]
However, when the piston 16 is in close contact with the inner wall surface of the holding cylinder 11, the close contact portions are only the front peripheral end edge of the annular front flange wall 19 and the rear peripheral end edge of the annular rear flange wall 25. Since no sliding resistance is generated, the operation of the handles 5 and 6 is never troublesome. Further, the close contact at only two locations of the front peripheral end edge of the annular front flange wall 19 and the rear peripheral end edge of the annular rear flange wall 25 regulates the backlash and inclination of the piston 16 itself that moves forward. Since the correct forward posture can be maintained, it is possible to effectively prevent the rear end side of the film pack 31 from being accidentally swallowed between the piston 16 and the holding cylinder 11 from this point.
[0025]
Further, when the sealing material filled in the film pack 31 is sequentially pushed out by the piston 16, the film pack 31 itself is gradually reduced in size accordingly, but all the sealing material is pushed out. Then, as shown in FIG. 6, the film pack 31 is automatically compressed and recovered in the cylindrical cap 15, and thereafter, the cap 15 is removed from the front end cap 13 of the holding cylinder 11. If removed, the compressed film pack 31 can be easily disposed of without bulking the hands or fingers. When the piston 16 is retracted to be in a standby state, as described above, the lock lever 4 is pressed against the rear wall 2b side of the base frame 1 against the spring pressure of the coil spring 8, while guiding the guide. When the pressure contact of the hole edge of the insertion hole 4a with respect to the rod 9 is released and the bent rear end portion 9b of the guide rod 9 is pulled, the guide rod 9 retreats together with the piston 16, so that the sealing material again Injection is possible.
[0026]
The above description is for the film pack 31 in which both end portions 31a are sealed by welding. However, the film pack 31 in which both end portions 31a are sealed by caulking metal fittings 32 is used as in a so-called sausage pack. In the case of the object, as shown in FIG. 7, the film pack 31 is obtained by allowing the caulking metal fitting 32 on the rear end side to face the storage chamber 21 formed in the raised wall 20 in the front half of the piston 16. Since the rear end side of the film pack 31 can be pressed while centering in the holding cylinder 11, the pressing state and compression of the film pack 31 are particularly under the film pack 31 having the caulking metal fitting 32. The state becomes even better.
[0027]
If it is necessary to target a cartridge type sealing material, the cartridge type can be easily obtained by removing the injection nozzle 14 from the cap 15 and replacing the piston 16 with a small metal piston. It can also be used as a sealing material.
[0028]
In addition, in the above-described embodiment, the annular rear flange wall 25 that is in close contact with the inner wall surface of the holding cylinder 11 is also provided in the latter half of the piston 16. For example, as shown in FIG. 8, the annular rear flange wall 25 may be completely omitted, and an annular lateral groove 23a may be additionally formed on the concave outer peripheral portion, depending on the implementation. .
[0029]
In particular, in this case, the annular front flange wall 19 in the front half of the piston 16 is further obtained by obtaining a synergistic effect of the newly formed annular lateral groove 23a and the previously formed annular longitudinal groove 23. Since the front peripheral edge of the flange wall 19 can be reasonably expanded and brought into close contact with the inner wall surface of the holding cylinder 11, the intended purpose is achieved while simplifying the structure of the piston 16 itself. It becomes possible to do.
[0030]
【The invention's effect】
As described above, according to the present invention, by adopting the above-described configuration, under the first aspect, the piston is formed of an elastic material rich in oil resistance, heat resistance, and wear resistance. The piston itself can be prevented from easily deteriorating due to sliding in the holding cylinder, and when the sealing material is pressed, the reaction force is used to closely contact the front peripheral edge of the piston to the inner wall surface of the holding cylinder. Unlike the conventional case, the rear end side of the film pack filled with the sealing material is squeezed between the piston and the holding cylinder, and a large force is required for the handle operation. Alternatively, depending on the squeezed state, it is possible to effectively prevent the subsequent steering operation from being disabled and becoming unusable. In addition to this, since the thin annular flange wall is provided outside the front half of the piston, the deflection is obtained and the front peripheral edge of the annular flange wall is securely adhered to the inner wall surface of the holding cylinder. In addition, the rear end side of the film pack can be pressed evenly by cooperating with the frustoconical raised wall provided inside the front half of the piston. Guarantees the injection of sealant.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an injection gun according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part in an exploded manner showing a piston and related parts.
FIG. 3 is a sectional view of a piston.
FIG. 4 is a perspective view showing an example of a film pack type sealing material.
FIG. 5 is a cross-sectional view of a main part showing a state in which a film pack is pressed by a piston.
FIG. 6 is a cross-sectional view of a main part showing a state in which a film pack is compressed into a cylindrical cap by a piston.
FIG. 7 is a cross-sectional view of the main part showing a state in which a film pack sealed with caulking metal fittings is pressed by a piston.
FIG. 8 is a cross-sectional view showing another example of a piston.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base frame 5 Fixed handle 6 Movable handle 9 Guide rod 9a Front end part 9b of guide rod 10 Rear end part 10 of guide rod Cylindrical bracket 11 Holding cylinder 14 Injection nozzle 15 Cylindrical cap 16 Piston 17 made of elastic material Insertion hole 18 Annular notch 19 Annular front flange wall 20 Raised wall 21 Caulking fitting storage chamber 22 Nut storage chamber 23 Annular longitudinal groove 23a Annular lateral groove 24 Annular notch 25 Annular rear flange wall 26 Side wall 29 Mounting metal plate 30 Nut L1 Front and rear flange wall outer diameter L2 Holding cylinder inner diameter

Claims (1)

A base frame that supports the guide rod so as to be able to move forward and backward, a handle that is provided on the base frame and applies a forward force to the guide rod, and a film pack that is detachably attached to the base frame and is filled with a sealing material. In a sealing material injection gun equipped with a holding cylinder for storing, and a piston for sealing material extrusion fixed to the front end of the guide rod, the piston is integrated with an elastic material rich in oil resistance, heat resistance and wear resistance. while molding, the front half portion facing the sealing member of the piston, with intervening annular notch hollow portion exhibiting a substantially V-shaped section, the thin annular flange wall outside provided, frustoconical in the inner provided with a raised wall forms a housing chamber for accommodating the caulking fittings film pack on the front center of該隆Okoshikabe, and, the annular flange wall at the base portion of the annular flange wall To form a cyclic longitudinal groove to encourage deflection, injection gun of the sealing material characterized by adhering the thin annular flange wall to the inner wall surface of the holding tube.

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