JPS6154549B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the nose of a screw driving machine.

Conventional screw driving machines have large noses with complicated structures, and are therefore unsuitable for work that requires a small and convenient screw driving machine. For this reason, a nose has been developed that is composed of a mounting portion, a nose block, and a pair of chucks and can be attached to any screw driving machine. This nose is hollow at the rear of the nose block, and a mounting portion is slidably supported therein. In addition, the side surface of the tip of the chuck has a V-groove and an opening behind it, so loading a screw can be done simply by placing the screw shaft in the V-groove, placing the head in the opening, and pushing in with your fingers. There is. Therefore, by using this nose, a compact screw driving machine can be obtained, which facilitates work in narrow spaces and outdoors.

However, the structure of the nose block is rather complicated because it requires a chuck to be attached to the front part and a hollow part to receive the attachment part to the rear part.

The present invention aims to further simplify the above-described nose structure.

In order to achieve such an objective, according to the present invention,
a mounting part that can be removably mounted on the tip of a screw driver body having a bit and its driving part;
It consists of a nose block supported by the mounting part, and a pair of chucks that abut each other at the tips of the nose block to hold the screw, and open when the screw is pushed in with a bit. is hollow and a nose block is supported to slide inside the hollow, and a V-groove extending along the axis of the wobbler is formed on the side surface of the tips of the pair of chucks that are in contact with each other. Behind the V-groove is provided a screw driver nose which is provided with an opening leading to the screw guide hole. That is, in the present invention, the mounting portion is hollow and the nose block is configured to slide therein, thereby simplifying the structure of the nose block. According to an embodiment of the present invention, a spring is provided between the nose block and the mounting portion to cause the nose block to protrude forward under normal conditions. A pad may be provided at the tip of the nose block or chuck to ensure positioning of the nose. Further, it is preferable to form the tip of the nose into a tapered shape, which further reduces the size and improves work efficiency in narrow spaces. The invention further provides a nose with an adjustable stop between the nose block and the mounting part, so that the screwing depth can be adjusted.

Embodiments of the present invention will be described below with reference to the drawings. One nose according to the invention is shown in Figures 1-6. The nose is roughly divided into a hollow cylindrical attachment part 1 that can be removably attached to the screw driving machine body (not shown for convenience of explanation) having a bit drive part.
A nose block 2 is connected to the mounting part 1 and slides in the axial direction within the hollow part of the mounting part, and a nose block 2 is mounted on the nose block and is biased by a spring so that its tip abuts, and has a screw inside. and a pair of screw holding chucks 3 which hold the screws and open when driving the screws.

The mounting part 1 has a fixing lock screw 4 at its end so that it can be connected and fixed to the nose mounting part of the screw driving machine body, so that the entire nose can be removably mounted on the screw driving machine. Preferably, this attachment part is configured to be compatible with the screwdriver to which it is attached.
A guide slot 5 extending in the axial direction is formed in the side surface of the mounting portion 1. As shown in FIG.

The nose block 2 has a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the mounting portion 1 at its rear end, and a guide pin 6 that moves within a guide slot 5 of the mounting portion 1 is provided at the rear end. As a result, the nose block 2 guides its sliding movement within the mounting portion 1, limits the length of its movement, and further prevents the nose block 2 from rotating. A rod 7 (Fig. 4) is attached to the inside of the mounting part 1 facing the nose block 2. A hole 8 is provided in the nose block 2 opposite to this rod 7, and a spring is installed around the rod 7. 9 is provided. Unless a force is applied to the nose block 2 from the outside, the pin 6 is urged to stop at the position where it abuts the front end of the guide slot 5, as shown most clearly in FIG.

As shown in FIG. 1, the front part of the nose block is tapered in the thickness direction, and the chuck 3 is attached to this part. A bit guide 11 having a bit guide hole 10 for guiding a bit (not shown) extending from a screw driver is formed in the nose block, and the bit can slide in the axial direction while maintaining its rotation. It's becoming like that. A pair of chucks 3 are pivotally supported on both sides of the guide 11 by pins 12. A spring 13 is provided at the rear of the chuck 3 between it and the side of the guide 11, so that the tips of the chuck 3 are brought into contact with each other. The pair of chucks are grooved on their contact surfaces so that a hole 14 extending continuously to the bit guide hole 10 is formed. Pads 15 projecting forward are attached to both side edges of the tip of the nose block 2, thereby facilitating the positioning of the nose of the screw driver.

The holes 14 formed in the mutually abutting chucks are narrowed in diameter near their tips by tapered holes 16, and the holes 17 at the tips are made small in diameter so as to hold the shank of the screw. The head of the screw pushed out by the bit through the tapered hole 16 opens the tip of the chuck 3, and the screw is driven out of the hole. As shown in FIGS. 3 and 5, the mutually abutting side surfaces of the tip of the chuck 3 are inclined so as to form a V-groove 18. An opening 19 is formed at the rear of the V-groove 18 through which the head of a screw communicating with the hole 14 can pass. This opening is made slightly smaller than the diameter of the hole 14 to prevent the loaded screw head from popping out. Furthermore, above the V-groove, a U-groove 20 is formed which is continuous with the V-groove and tapers. This U-groove has a narrow width with the V-groove 18 as the bottom surface, and protects fingers from getting caught in the chuck when pushing in the screw.

The V-groove 18 and (U-groove 20) opening 19 allow the screw to be placed with its head above the opening 19 and its shaft along the V-groove 18, and by pushing this screw with your thumb, the chuck 3 opens and the screw is removed. It is loaded into the holes 14, 16, 17 while maintaining its orientation. It is preferable that the hole 17 is slightly smaller than the diameter of the screw shaft, but even if it is larger than the shaft diameter, some looseness is allowed.

A stopper 21 is provided at the rear of the nose block 2.
is attached so that its rod 22 extends toward the end face of the attachment portion 1 (FIG. 4). The protruding length of the rod 22 of the stopper 21 is adjusted by a screw 23 at the opposite end, and the screwing depth of the screw is adjusted.

Another nose according to the invention, shown in Figures 7-10, is much the same as that shown in Figures 1-6, but a pad 15' is attached to the tip of the chuck and its tip is rounded. In addition, the tip of the nose block 2' is tapered not only in the thickness direction but also in the width direction, especially on the side surface of the chuck where the V groove 18 and the opening 19 are provided. The difference is that 2' is cut so as not to cover it, and that there is no U-groove 25 accompanying this. Other points are the same as in FIGS. 1 to 6.

According to the present invention, it is possible to provide a nose that is easy to load screws without protruding parts such as screw loading chute, but also eliminates the need for complicated machining of the nose block, and furthermore, the tip of the nose is formed to be thin. This increases work efficiency in narrow spaces.

[Brief explanation of the drawing]

FIG. 1 is a side view of one nose according to the invention;
Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
4 is a sectional view taken along line B-B in FIG. 3, FIG. 5 is a front view of the nose in FIG. 1, and FIG.
The figure is a sectional view taken along the line C-C of FIG. 3, FIG. 7 is a side view of another nose according to the present invention, and FIG. 8 is a sectional view of FIG.
9 is a plan view of the nose of FIG. 7, and FIG. 10 is a sectional view taken along line B'-B' of FIG. 9. 1... Mounting part, 2, 2'... Nose block,
3...chuck, 5...guide slot, 6...
Pin, 9... Spring, 11... Bit guide, 12
...Pivot pin, 13...Spring, 14, 16, 17
...hole, 15,15'...pad, 18...V
Groove, 19...opening, 20...stopper.

Claims (1)

[Scope of Claims] 1. A mounting part that can be removably mounted on the tip of a screw driving machine body having a bit and its driving part, a nose block supported by the mounting part,
It consists of a pair of chucks that abut each other at the tip of the nose block to hold the screw, and are opened when the screw is pushed in with a bit.The mounting portion is hollow and the nose block is held inside the hollow. It is supported so as to slide, and a V groove extending along the axis of the wobble is formed on the side surface of the tips of the pair of chucks that are in contact with each other, and the rear side of this V groove communicates with the screw guide hole. The nose of a screwdriver with an opening. 2. The nose according to claim 1, wherein a spring is provided between the nose block and the mounting portion to urge the nose block to protrude forward. 3. The nose according to claim 2, wherein the tip of the nose block is provided with a pad that projects forward from the tip of the chuck. 4. The nose according to claim 3, wherein the tip of the nose block is tapered in its thickness direction. 5. The nose according to claim 2, wherein the tip of the chuck is provided with a pad that projects forward. 6. The nose according to claim 5, wherein the tip of the nose block is tapered together with the chuck in the width direction and thickness direction. 7. A mounting part that can be removably mounted on the tip of a screw driving machine body having a bit and its driving part, and a nose block supported by this mounting part;
It consists of a pair of chucks that abut each other at the tip of the nose block to hold the screw, and are opened when the screw is pushed in with a bit.The mounting portion is hollow and the nose block is held inside the hollow. It is supported so as to slide, and a V groove extending along the axis of the wobble is formed on the side surface of the tips of the pair of chucks that are in contact with each other, and the rear side of this V groove communicates with the screw guide hole. A screwdriver nose that is provided with an opening and a stopper between the nose block and the mounting part. 8. The nose according to claim 7, wherein the stopper is attached to a nose block so that its length can be adjusted from the outside of the block. 9. The nose according to claim 8, wherein the tip of the nose block is provided with a pad that projects forward from the tip of the chuck. 10. The nose according to claim 9, wherein the tip of the nose block is tapered in its thickness direction. 11. The nose according to claim 8, wherein the tip of the chuck is provided with a pad that projects forward. 12. The nose according to claim 11, wherein the tip of the nose block is tapered together with the chuck in the width direction and thickness direction.