JP2515066Y2 - Plate punching tool - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] This invention is applied to various floor slabs such as deck plates and keystone plates.
According to the hole punching tool for plates used to open a mounting hole for suspending a suspension member such as an electric equipment member, the hole punching tool for plates described in Japanese Utility Model Publication No. 4-14598 previously proposed. Regarding the improvement of.

[0002]

2. Description of the Related Art Conventionally, at the construction site of a building, various mounting holes for inserts and other mounting members for suspending hanging members such as suspension bolts and suspension bolts for supporting electric equipment, disaster prevention members, air conditioning members, etc. As a means for opening plates such as floor slabs of
There is a drilling tool for plates described in Japanese Patent No. 598.

In this tool, a grip is mounted on the upper part and a hammer is slidably fitted on a shaft having a striking body mounted on the lower part thereof so that the hammer can be slid between the grip and the striking body. The punch is detachably attached to the.

[0004]

However, according to the conventional tool, the strength problem remains in the connecting structure of the shaft and the punch. That is, as shown in FIG. 5, the conventional means for connecting the punch 20 to the shaft 40 is the insertion hole 3 for inserting the punch along the axial direction of the connecting bolt 30.
1 is opened to provide a connecting bolt 30 in a tubular shape, and the connecting bolt is screwed to the lower end of the shaft 40 with the punch 20 attached to the tubular connecting bolt 30. Therefore, since the impact force transmitted from the shaft 40 to the punch 20 is transmitted through the tubular connecting bolt 30, when the connecting bolt 30 is formed, a slight deviation or deviation in the thickness of the tubular shape causes the punch 20. It has been found that the connecting bolt 30 itself may be damaged by the impact force transmitted to.

Therefore, the present invention has been devised to solve the above-mentioned problems, and it is capable of withstanding the impact force transmitted from the shaft of the punching tool for plates to the punch and is extremely durable. The purpose is to provide tools.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a shaft provided with a grip on the upper part and a striking member on the lower part, and slidably movable between the grip and the striking member. Is a hole-drilling tool in which a hammer is externally fitted and a punch is detachably attached to the lower end of the impact receiving body, and a female screw-shaped attaching recess is formed in the lower portion of the impact receiving end. A screw-shaped rail is projected on the outer peripheral surface of the punch head.
Then, the fixing nut is screwed onto the male screw-shaped rail, and the cushioning material whose forceful fit is fitted to the punch from the tip of the punch is brought into contact with and held by the male screw-shaped rail. Further, a relaxation preventing means composed of a pair of washers is inserted between the male screw-shaped rail and the impact receiving body, and an impact cushioning member made of an elastic material is arranged on the upper portion of the impact receiving body to solve the problem. Use it as a means.

[0007]

In other words, according to this invention, the punch is directly connected to the mounting recess at the lower end of the impact receiving body. The striking force of the hammer sliding on the shaft between the grip and the striking body is directly transmitted from the striking body to the punch. The cushioning material that is force-fitted to the punch absorbs an impact when the punch penetrates the plate. Also, the loosening prevention means consisting of a pair of washers prevents the punch from loosening, and the shock absorbing member made of an elastic material arranged on the upper part of the impact receiving body prevents damage of both when hitting the hammer and the impact receiving body. To prevent.

[0008]

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

A reference numeral 1 shown in the drawings is a shaft, and a grip 2 which is gripped by an operator's finger in order to maintain the device of the invention upright is provided on the upper portion of the shaft 1.
At the lower part, hitting bodies 10 for mounting punches 5 for punching holes in plates P such as deck plates and various floor slabs called keystone plates are mounted respectively, and the shaft 1 itself has improved robustness, It is sometimes made into a hollow pipe shape in order to reduce the weight when it is carried.

The grip 2 is sized so that it can be gripped with fingers, is made of an elastic material such as rubber, and has a corrugated concavo-convex shape in order to facilitate gripping operation and prevent slippage during gripping.
It is forcibly fitted onto the shaft 1. Since a hammer 3 may be hit by the grip 2 as described later, a lower portion thereof is projected in a flange shape having a diameter larger than that of the shaft 1 to receive the hammer 3.

A striking body 8 attached to the lower end of the shaft 1.
Is integrally connected to the solid rod-shaped shaft 1 as shown in the drawing, and has a female screw-shaped mounting recess 9 formed in the lower portion thereof.
Punch 6 with the cone-shaped tip part inside
Is inserted and held.

Then, a male screw-shaped rail 7 which is screwed into the mounting recess 9 is provided on the outer peripheral surface of the head of the punch 6. This male screw-shaped rail 7 is provided integrally with the head of the punch 6. A fixing nut 14 is screwed to the male screw rail 7. In addition, the cushioning material 12, which is forcibly fitted to the punch 6 from the tip of the punch 6, is brought into contact with and held by the male screw-shaped rail 7. Further, a loosening prevention means 10 composed of a pair of washers 11 is inserted between the fixed nut 14 and the impact receiving body 8. An impact cushioning member 13 made of an elastic material is provided on the upper portion of the impact receiving body 8. The pair of washers 11 are provided with wedges 11A on the inner side surfaces that are in contact with each other and radial ribs 11B on the outer side surfaces.

The shaft 1 has a grip 2 and a striking body 8.
Hammer 3 is fitted on the outside so that it can slide freely between
The hammer 3 itself is formed in a substantially cylindrical shape having a sliding hole to be fitted onto the shaft 1, and the impact load applied to the impact receiver 8 when the hammer 3 is dropped from the upper portion of the shaft 1 is applied to the impact receiver 8. The punch 6 acts as an opening force for the plates P through the. Hammer 3
The weight of itself, the length of the shaft 1 corresponding to the falling distance of the hammer 3 so as to obtain a predetermined impact load, etc. are appropriately set depending on the diameter of the mounting hole to be punched in the plates P, the thickness of the plates P, etc. Is. Reference numeral 4 in the drawing is a lock screw, which is inserted into the hammer 3 itself from the outside of the hammer 3 and screwed in such a manner that the hammer 3 can advance and retreat, and the tip of the lock screw is fixed to the outer surface of the shaft 1 to fix the hammer 3 itself, and the , Prevents unnecessary movement of the hammer 3 during transportation to improve worker safety. Further, 5 is a handle, which is provided on the outer surface of the hammer 3 in a loop shape along the falling direction thereof, and with this, waiting for the hammer 3 to move upward,
It can be used as a handle when carrying.

A shock absorbing member 13 made of an elastic material is provided on the upper part of the impact receiving body 8. The shock absorbing member 13 is made of, for example, urethane rubber having excellent abrasion resistance, and the hammer 3 is It is arranged by forming a donut shape having a diameter that does not directly strike the impact receiving body 8 and forcibly fitting it into the shaft 1 above the impact receiving body 8.

Next, referring to FIGS. 3 and 4, its use will be described. At the opening position of various plates P such as floor slabs installed according to a predetermined design, the impact receiving body 8 is used. By putting the tip of the punch 6 attached to the device, the whole device of this invention is put upright and properly held by the grip 2.
Then, the hammer 3 is lifted above the shaft 1 and dropped by its own weight. Then, the self-weight of the hammer 3 and its impact load are applied to the impact receiving body 8, and this is transmitted to the punch 6, so that a mounting hole of a predetermined size can be formed in the plates P by punching. In order to remove the punch 6 from the plates P after forming the perforation, the tool as a whole may be forcibly lifted. At that time, if necessary, the hammer 3 may move upward with respect to the grip 2 a proper number of times. Then, the punch 6 may be released from the punch 6.

[0016]

The present invention achieves the original purpose by being configured as described above.

In other words, the impact force transmitted from the shaft to the punch of the devised drilling tool is endured, and as a result, the impact force transmitted from the shaft to the punch of the conventional tool is prevented from damaging the cylindrical connecting bolt. . Therefore, the drilling tool of the present invention has excellent durability even after repeated use.

Further, the shaft and the punch can be reliably attached and detached without being affected by the impact force transmitted from the shaft to the punch and the plates punched by the punch.

As described above, according to the present invention, it is possible to endure the impact force transmitted from the shaft of the hole punching tool for plates to the punch, is extremely durable, and is practically useful in that the shaft and the punch can be securely attached and detached. Has various effects.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part showing the present invention.

FIG. 2 is a cross-sectional view of an essential part showing a punch portion of the present invention.

FIG. 3 is a sectional view of an essential part showing a striking body part of the present invention.

FIG. 4 is a side view showing a usage state of the present invention.

FIG. 5 is a sectional view of an essential part showing a conventional punch part.

[Explanation of symbols]

 P Plates 1 Shaft 2 Grip 3 Hammer 4 Lock screw 5 Handle 6 Punch 7 Male screw rail 8 Strike receiver 9 Mounting recess 10 Loosening prevention means 11 Washer 11A Wedge 11B Rib 12 Cushioning material 13 Shock absorbing member 14 Fixing nut 20 Punch 30 connecting bolt 31 insertion hole 40 shaft

Claims (1)

(57) [Scope of utility model registration request] 1. A hammer having slidable movement between the grip and the striking body is externally fitted to a shaft having a gripping portion on the upper side and a striking body is mounted on the lower side, and a punch is attached to and detached from the lower end of the striking body. It is a freely drilling tool, and a female screw-shaped mounting recess is formed in the lower part of the impact receiving body, and a male screw-shaped rail screwed into this mounting recess is projected on the outer peripheral surface of the head of the punch . Hole
It is an opening tool, and the fixing nut is screwed to the male threaded rail.
And the tip of the punch is forcibly fitted into the punch.
Cushioning material is held by abutting against the male threaded rail,
Relaxation prevention consisting of a pair of washers between the rail and the impact receiving body
Stopper is inserted, and impact made of elastic material on the top of the impact receiver.
A drilling tool for plates, which is provided with a cushioning member .