JPH0113580Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a method for filling gaps in walls and adhering members such as tiles during interior construction work of buildings by inhaling and discharging viscous caulking agent in a water gun style. The present invention relates to improvements to caulking guns used for.

For this type of caulking gun, it is essential to maintain airtightness and liquidtightness between the piston head and the cylinder wall.
Various improvements have been made to the structure. However, it is extremely difficult to maintain complete liquid tightness between the piston and cylinder wall over a long period of time, and it is unavoidable that caulking agent leaks to the rod side during use. For this reason, in conventional caulking guns, the leaking caulk adheres to the rod, and as the rod moves, it reaches the drive mechanism that provides driving force to the rod, where it adheres and hardens, allowing the rod to move smoothly and This could significantly impede power transmission to the equipment and even cause damage to the equipment.

The present invention improves the above-mentioned drawbacks by providing a scraping mechanism in the rod penetration part of the rear wall of the cylinder that separates the cylinder chamber and the drive mechanism, thereby preventing the caulking agent from entering the drive mechanism. The purpose of the present invention is to obtain an inexpensive caulking gun that can be used for long periods of time without maintenance such as cleaning. A caulking gun comprising a piston head located at the rear of the cylinder, and a rod having one end connected to the piston head and a portion of which extends through the rear wall of the cylinder and is connected to the drive part. A caulk scraping member is attached to the rod penetrating portion of the wall, the tip of which projects into the cylinder and is formed at an acute angle and comes into contact with the surface of the rod.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a cutaway side view of the main parts of the caulking gun of the present invention, in which 1 is the cylinder, 2 is the piston rod,
3 is a piston head coupled to the tip of the piston rod 2; 4 is a nozzle removably attached to the tip of the cylinder 1; 5 is the piston rod 2.
and a piston head 3, the caulking agent is drawn into the cylinder 1 from the outside by the backward movement of the piston, 6 is a drive mechanism part provided adjacent to the rear end of the cylinder, and 7 is a part of the drive mechanism part. (The structure of the drive mechanism section is not directly related to the gist of the present invention, so it will be omitted). The rear part of the piston rod 2 is connected to the rear wall 1a of the cylinder 1.
The caulking gun is connected to the drive mechanism section 6 through the caulking gun, and its rear end projects toward the rear of the caulking gun. Reference numeral 8 denotes a caulking agent scraping member, which has a cylindrical shape with a rod through hole 9 as shown in FIG. A flange 10 is formed therein for attachment and fixation to the rear wall 1a of the cylinder.

FIG. 3 shows another embodiment in which the scraping member 8 is formed integrally with the rear wall 1a of the cylinder, which is the same as that shown in FIG. 1 except that the rear portion is molded integrally with the rear wall of the cylinder. It has the same configuration as the original.

The present invention has the above-mentioned configuration,
Even if the caulking agent enters the rear of the piston head 3 during use and adheres to and hardens on the piston rod 2, when the rod moves backward, it will be removed from the sharply angled tip of the scraping member 8 provided on the cylinder rear wall 1a. It will not get ripped off and get into the drive mechanism, allowing smooth operation at all times.

As explained above, in the caulking gun of the present invention, the caulking material adhering to the surface of the rod is peeled off every time the rod moves backward, so the operation is performed smoothly, and the work of cleaning the adhering and hardened caulking agent is frequently performed. It has extremely great practical value, as it eliminates the need for additional work, greatly improves work efficiency, and allows production at low cost.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing one embodiment of the caulking gun of the present invention, Fig. 2 is a perspective view showing an example of a scraping member used in the caulking gun, and Fig. 3 is an embodiment of the caulking gun of the present invention. FIG. 3 is a sectional view of a main part showing an example. 1...Cylinder, 2...Piston rod, 3...
... Piston head, 4 ... Nozzle, 6 ... Drive mechanism section, 8 ... Scraping member.

Claims (1)

[Scope of utility model registration request] a cylinder having a rear wall having a nozzle at its tip and a rod penetration at its rear end, a piston head disposed within the cylinder, one end of which is coupled to the piston head and a portion of which covers the rear wall of the cylinder; In a caulking gun equipped with a rod that penetrates and is connected to a drive part, the caulking gun has a tip that protrudes into the cylinder and is formed at an acute angle and contacts the surface of the rod at the rod penetration part of the rear wall of the cylinder. A caulking gun characterized by being equipped with a member for scraping off the agent.