Pitch guide jig for screw gun

Abstract

To provide a pitch guide jig for a machine screw driver which can be effortlessly attached to machine screw driver bodies of varied shapes and enables its tip to match with a construction reference line even if an orientation of a ruler member is changed to a vertical direction or a lateral direction.SOLUTION: A pitch guide jig 2 includes: an inner cylinder member 3 which is fitted on an area near a tip of a nose part 12 having a machine screw ejection port 11 and fixed; an outer cylinder member 4 which is fitted on the inner cylinder member 3 and held so as to be rotatable 90 degrees around an axis core of the inner cylinder member 3; and a ruler member 5 which is held in a manner that the ruler member 5 can be switched in a vertical orientation or a lateral orientation by rotation of the outer cylinder member 4. The inner cylinder member 3 is fixed so that its axis core matches with an axis core of the ejection port 11. A tip of the ruler member 5 is attached with a guide stick 51 which respectively indicates positions immediately above and immediately lateral to the axis core of the ejection port 11 when the ruler member 5 is held in the vertical orientation and the lateral orientation.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The invention disclosed in this application relates to a pitch guide jig attached to a hand-held screw driver or the like.

Background Art

[0002] At the interior construction site of a building or the like, when screwing a facing material made of gypsum board, plywood, etc. to a base material made of wood, lightweight steel frame, etc., a hand-held screw driver continuously driven by compressed air is often used. In such screw driving work, in order to obtain a predetermined fixing strength, it is required to align the pitch (driving interval) of the screws to be within a specified dimension. Therefore, pitch guide jigs that can be attached to a screw driver have been proposed in, for example, Patent Documents 1 to 4 and the like.

[0003] That kind of pitch guide jig generally comprises a detachable attachment member near the main body barrel of the screw driver, a carrying member extending from the attachment member toward the screw ejection port side, and a telescopic scale member extending in a direction perpendicular to the operating axis of the screw ejection port near the tip of the carrying member. And by driving the next screw while aligning the tip of the scale member, the length of which has been adjusted in advance to match a specified pitch, with the head of the previously driven screw, the pitch of the screws can be aligned. The scale member can be attached either vertically or horizontally with respect to the holding posture of the screw driver in accordance with the direction of the construction reference line (base line) for driving the screws.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] The conventional pitch guide jigs disclosed in the aforementioned patent documents have the inconvenience that they cannot be attached to screw guns with different mounting parts (for example, products from other companies or redesigned models) because the mounting part on the screw gun body and the method of fixing it to that mounting part are predetermined.

[0006] Furthermore, although the ruler member is designed to be oriented either vertically or horizontally, the movable part that enables this change is not located on the axis of the screw injection port. Therefore, for example, when oriented vertically, the tip of the ruler member can be aligned with the construction reference line, but when oriented horizontally, the tip of the ruler member will no longer be aligned with the construction reference line.

[0007] The invention disclosed in this application has been made in view of the circumstances described above, and aims to provide a pitch guide jig for a screw gun that can be attached without difficulty even if the shape of the screw gun body differs slightly, and that allows the tip of the guide member to be aligned with the construction reference line regardless of whether the ruler member is oriented vertically or horizontally.

[0008] In the specification and claims of this application, handheld tools that are driven by compressed air or electric power and that continuously eject screws, nails, staples, and other fasteners by trigger operation are conveniently referred to collectively as "screw guns." [Means for solving the problem]

[0009] To achieve the aforementioned objective, the pitch guide jig for a screw gun according to the invention disclosed herein comprises: an inner cylinder member fitted externally to the vicinity of the tip of a nose portion having a screw ejection port and fixed to the nose portion; an outer cylinder member fitted externally to the inner cylinder member and held so as to be rotatable around the axis of the inner cylinder member on the outside of the inner cylinder member; and a ruler member attached to the outer cylinder member and held in a predetermined position by the rotation of the outer cylinder member. The inner cylinder member is fixed so as to align its axis with the axis of the ejection port, thereby configuring the tip of the ruler member to indicate a predetermined position on a concentric circle centered on the axis of the ejection port, regardless of the position of the ruler member.

[0010] Furthermore, in the pitch guide jig for a screw gun with this basic configuration, an additional configuration can be adopted in which a plurality of fixing screws that move forward and backward toward the axis are screwed into the circumferential part of the inner cylinder member, and the inner cylinder member is fixed so that its axis aligns with the axis of the nozzle by fastening the fixing screws and clamping the vicinity of the tip of the nose portion from multiple directions, and the outer cylinder member has a plurality of guide grooves formed therein in which the fixing screws that protrude to the outside of the inner cylinder member are introduced when the outer cylinder member is fitted onto the inner cylinder member.

[0011] Furthermore, in the first specific embodiment, both the inner cylinder member and the outer cylinder member are cylindrical in shape, the fixing screws are screwed into three locations on the circumference of the inner cylinder member, and the inner cylinder member is fixed by the three fixing screws clamping the vicinity of the tip of the nose portion from three sides, and the outer cylinder member has three guide grooves formed in it that define the stopping position when the inner cylinder member is rotated around its axis by introducing each of the fixing screws.

[0012] Furthermore, in a second specific embodiment, both the inner cylinder member and the outer cylinder member may be cylindrical in shape with a square, regular octagon, or other quadruple-symmetrical cross-section, with the fixing screws screwed into four locations on the circumference of the inner cylinder member, and the inner cylinder member being fixed by the four fixing screws clamping the vicinity of the tip of the nose portion from all four sides, and the outer cylinder member having four guide grooves formed therein for introducing each of the fixing screws.

[0013] Furthermore, in each of the above-described configurations, an additional configuration can be adopted in which a guide stick is attached to the tip of the ruler member, which indicates the position directly above and directly to the side of the axis of the nozzle, respectively, when the ruler member is held in a vertical and horizontal position. [Effects of the Invention]

[0014] As described above, the pitch guide jig for the screw gun has a double structure consisting of an inner cylinder member and an outer cylinder member. First, the inner cylinder member is fixed near the tip of the nose section, and its axis is aligned with the axis of the nozzle. Then, the outer cylinder member is fitted onto the inner cylinder member, so that the outer cylinder member is held in a position where it can rotate around the axis of the nozzle. Therefore, while the inner cylinder member remains fixed to the screw gun body, the ruler member attached to the outer cylinder member can be easily switched to a vertical, horizontal, or any other arbitrary orientation simply by rotating the outer cylinder member around the inner cylinder member. Since the tip of the ruler member or the tip of the guide stick attached to its tip rotates on a concentric circle around the axis of the nozzle, regardless of the orientation of the ruler member, the tip of the ruler member or the tip of the guide stick can be correctly aligned at a constant pitch on the construction reference line in any orientation without needing to readjust the length or position of the ruler member.

[0015] Furthermore, if a configuration is adopted in which the inner cylinder member is fixed to the nose section by multiple fixing screws that move back and forth toward its axial center, this pitch guide jig can be attached to screw guns with various nose section shapes. [Brief explanation of the drawing]

[0016] [Figure 1] It is a side view showing the configuration of a screw driving machine and a pitch guide jig according to an embodiment of the invention disclosed in the present application. [Figure 2] It is an explanatory view showing the shape of the guide groove formed in the outer cylinder member of the pitch guide jig of FIG. 1 and the rotation state of the outer cylinder member as viewed from the tip side of the screw driving machine. [Figure 3] It is an explanatory view showing another shape of the guide groove formed in the outer cylinder member of the pitch guide jig of FIG. 1 and the rotation state of the outer cylinder member as viewed from the tip side of the screw driving machine. [Figure 4] It is an image view showing the usage state of the pitch guide jig of FIG. 1. [Figure 5] It is an explanatory view showing the shape of the inner cylinder member and the outer cylinder member of the pitch guide jig according to another embodiment of the invention disclosed in the present application and the rotation state of the outer cylinder member as viewed from the tip side of the screw driving machine.

MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, embodiments of the invention disclosed in the present application will be described with reference to the drawings.

[0018] Figs. 1 to 4 show an embodiment of a screw-driving machine 1 and a pitch guide jig 2 attached to the screw-driving machine 1. The example screw-driving machine 1 is composed of a nose part 12 having a screw ejection port 11 at its tip, a magazine 13 that continuously supplies screws to the nose part 12, a housing 14 that houses a driving mechanism of a driver bit (not shown), a grip part 15 formed below the housing, etc. At the tip of the nose part 12, a contact top 16 pressed against the construction surface and a contact arm 17 that retreats together with the contact top 16 by a predetermined stroke by the pressing are attached. When the trigger 18 is operated with the contact top 16 pressed against the construction surface, the built-in driver bit is propelled by the driving force of compressed air and drives the screw supplied into the ejection port 11 toward the workpiece. However, since the invention disclosed in the present application does not limit the detailed shape and driving mechanism of the screw-driving machine 1 itself, as long as there is a neck-shaped portion (contact arm 17 in the exemplary form) having an appropriate thickness and length in the vicinity of the tip of the nose part 12, the attachment of the pitch guide jig described later is possible.

[0019] In addition, when explaining the relative positional relationship of parts / members and the direction of operation hereinafter, as shown in Fig. 4, with the grip part 15 of the screw-driving machine 1 held vertically and the axis of the ejection port 11 facing horizontally, when driving a screw into a vertical construction surface, the up-down direction (height direction of the construction surface), the front-back direction (direction of advancing and retreating toward the construction surface), and the left-right direction (lateral width direction of the construction surface) are specified based on this posture.

[0020] The pitch guide jig 2 is configured by combining an inner cylinder member 3 fixed in the vicinity of the tip of the nose part 12 of the screw-driving machine 1, an outer cylinder member 4 externally inserted into the inner cylinder member 3, and a scale member 5 attached to the outer cylinder member 4.

[0021] The inner cylinder member 3 in the exemplary configuration has a short cylindrical shape with an inner diameter slightly larger than the maximum outer diameter of the contact top 16 provided at the tip of the nose portion 12. Fixing screws 31 that move forward and backward toward the axis of the inner cylinder member 3 are screwed at three locations on the circumference of the inner cylinder member 3. Wing nuts are used for the fixing screws 31 in the exemplary configuration. As shown in Figure 2(a), the fixing screws 31 are arranged so that their central angles around the axis of the inner cylinder member 3 are spaced 120 degrees apart.

[0022] The outer cylinder member 4 in the example configuration has a short cylindrical shape, with an inner diameter slightly larger than the outer diameter of the inner cylinder member 3. Guide grooves 41 are formed at three locations on the circumference of the outer cylinder member 4 for introducing the shaft portion of the fixing screw 31 screwed into the inner cylinder member 3. As shown in light ink in Figures 2(a), (b), and (c), each guide groove 41 has a shape that is approximately T-shaped in side view, consisting of an introduction portion 42 extending parallel to the axis of the outer cylinder member 4 and opening at the rear end of the outer cylinder member 4, and a rotating portion 43 extending from the front end of the introduction portion 42 in the circumferential direction of the outer cylinder member 4. The length of the rotating portion 43 is set so that the central angle around the axis of the outer cylinder member 4 is 90 degrees + α (the diameter of the fixing screw 31).

[0023] A bracket 6 for holding a ruler member 5 is attached to the circumferential surface of the outer cylinder member 4. In the exemplary configuration, the bracket 6 is attached to a position where the central angle around the axis of the outer cylinder member 4 is 45 degrees with respect to the introduction portion 42 of one guide groove 41. The bracket 6 is equipped with a substantially cylindrical ruler member holding portion 61, and the ruler member 5 inserted through this ruler member holding portion 61 slides in the tangential direction (radial orthogonal direction) of the outer cylinder member 4 in a plane perpendicular to the axis of the outer cylinder member 4. The ruler member 5 is temporarily fixed in place by tightening the set screw 62 attached to the outside of the ruler member holding portion 61 after adjusting the length of the ruler member 5 to the desired screw pitch.

[0024] A guide stick 51 and a guide pin 52 are attached to the tip of the ruler member 5. The guide stick 51 extends in a direction perpendicular to the length direction of the ruler member 5 within a plane perpendicular to the axis of the outer cylinder member 4. The length of this extension matches the distance between the axis of the outer cylinder member 4 and the ruler member 5. Therefore, when the parallel lines of the ruler member 5 are superimposed on the tip of the guide stick 51, those parallel lines will pass through the axis of the outer cylinder member 4. The ruler member 5 has a scale 53 that indicates the distance between the axis of the outer cylinder member 4 and the guide stick 51, based on these parallel lines. The main body of the ruler member 5 and the guide stick 51 may be integrated in a roughly L-shape.

[0025] The guide pin 52 protrudes forward (towards the construction surface) from the tip of the guide stick 51, parallel to the axis of the outer cylinder member 4. Its tip is held slightly behind the tip of the nose portion 12 (in the example configuration, slightly behind the tip of the contact arm 17). Note that if the tip of the guide stick 51 is close to the construction surface, for example, by holding the ruler member 5 closer to the tip of the outer cylinder member 4, the guide pin 52 may be omitted.

[0026] When using this pitch guide jig 2, first insert the inner cylinder member 3 from the tip side of the screw gun 1 to a position that surrounds the outside of the contact arm 17, and fasten the three fixing screws 31 to fix the inner cylinder member 3 so that its axis roughly coincides with the axis of the nozzle 11. At this time, it is desirable to keep one of the fixing screws 31 upright relative to the body of the screw gun 1.

[0027] Once the inner cylinder member 3 is fixed to the screw gun 1, the outer cylinder member 4 is inserted onto the inner cylinder member 3 from the tip side of the screw gun 1, and the fixing screws 31 protruding from the outside of the inner cylinder member 3 are introduced into the guide grooves 41 of the outer cylinder member 4. At this time, as shown in Figure 2(a), the guide member 5 is tilted at a 45-degree angle with respect to the vertical and horizontal directions of the screw gun 1.

[0028] After inserting the outer cylinder member 4 and the fixing screw 31 abuts against the back of the introduction portion 42 of the guide groove 41, the outer cylinder member 4 is rotated around the axis of the inner cylinder member 3 so that the fixing screw 31 follows the rotating portion 43 of the guide groove 41. In the example configuration, when the screw gun 1 is rotated 45 degrees counterclockwise when viewed from the front end, the ruler member 5 becomes vertical as shown in Figure 2(b), and the tip of the guide stick 51 and the guide pin 52 indicate a position directly above the axis of the nozzle 11. Conversely, when the outer cylinder member 4 is rotated 45 degrees clockwise from the state shown in Figure 2(a), the ruler member 5 becomes horizontal as shown in Figure 2(c), and the tip of the guide stick 51 and the guide pin 52 indicate a position directly to the side of the axis of the nozzle 11. It is preferable to form engaging protrusions 44 or fitting parts at both ends of the guide groove 41, to which the fixing screws 31 are temporarily fastened, so that the outer cylinder member 4 is properly held in positions rotated by 45 degrees. Then, by adjusting the fixing screws 62 of the bracket 6 to set the ruler member 5 to the predetermined length, the preparation for screw driving work is complete.

[0029] Figure 3 shows a modified example of the guide groove 41 formed in the outer cylinder member 4. In the exemplary form, as shown by the light ink in the figure, the guide groove 41 has a shape that is approximately L-shaped in side view, consisting of an introduction portion 42 that extends parallel to the axis of the outer cylinder member 4 and opens to the rear end face of the outer cylinder member 4, and a rotating portion 43 that extends from near the front end of the introduction portion 42 in the circumferential direction of the outer cylinder member 4. In this form as well, the length of the rotating portion 43 is set so that the central angle around the axis of the outer cylinder member 4 is 90 degrees + α (the diameter of the fixing screw 31).

[0030] The bracket 6 that holds the ruler member 5 is mounted in a position that overlaps with the introduction portion 42 of one guide groove 41 when viewed from the front end of the screw gun 1. When the outer cylinder member 4 is inserted onto the inner cylinder member 3 by introducing the fixing screw 31 into this guide groove 41, the ruler member 5 is held horizontally as shown in Figure 3(a), with the fixing screw 31 temporarily fastened to the fitting portion 45 formed at the back of the introduction portion 42. The outer cylinder member 4 is moved slightly toward the front end of the screw gun 1 by temporarily removing the fixing screw 31 from the fitting portion 45, and the outer cylinder member 4 is rotated 90 degrees counterclockwise when viewed from the front end of the screw gun 1, so that the fixing screw 31 is aligned with the rotating portion 43 of the guide groove 41, and the ruler member 5 is held vertically as shown in Figure 3(b). A fitting portion 45 is also formed at the abutment portion of the rotating portion 43.

[0031] Figure 4 shows an image of how the pitch guide jig 2 is used. When driving screws along a vertical construction reference line, the ruler member 5 is oriented vertically, and the tip of the guide pin 52 is aligned with the head of the previously driven screw, while the next screw is driven downwards. When driving screws along a horizontal construction reference line, the ruler member 5 is oriented horizontally, and the tip of the guide pin 52 is aligned with the head of the previously driven screw, while the next screw is driven to the right (or left). Thus, whether the ruler member 5 is oriented vertically or horizontally, the screw driving work can be performed accurately while aligning the guide pin 52 with the construction reference line. When the contact top 16 of the screw gun 1 is pressed against the construction surface to drive in a screw, the ruler member 5 retracts towards the main body of the screw gun 1 together with the contact arm 17, so there is no interference between the guide pin 52 and the construction surface.

[0032] Figure 5 shows another embodiment of the pitch guide jig 2. Similar to the embodiment described above, the illustrated pitch guide jig 2 is constructed by combining an inner cylinder member 3 that is externally fitted and fixed to the contact arm 17 of the screw driving machine 1, an outer cylinder member 4 that is externally fitted to the inner cylinder member 3, and a ruler member 5 that is attached to the outer cylinder member 4.

[0033] However, in this embodiment, both the inner cylinder member 3 and the outer cylinder member 4 have a square cross-sectional shape. Fixing screws 31 are screwed into four locations around the circumference of the inner cylinder member 3, and by clamping the vicinity of the tip of the nose portion 12 from all four sides in a vertical and horizontal manner with these fixing screws 31, the inner cylinder member 3 is fixed so that its axis aligns with the axis of the nozzle 11.

[0034] On the other hand, the outer cylinder member 4 has four guide grooves 41 formed therein for introducing the fixing screws 31 that protrude to the outside of the inner cylinder member 3. These guide grooves 41 are formed by an introduction portion 42 that extends parallel to the axis of the outer cylinder member 4 and opens at the rear end of the outer cylinder member 4, and a fitting portion 45 formed at the back of the introduction portion 42.

[0035] A bracket 6 is attached to one side of the outer cylinder member 4 in such a manner that it does not interfere with the fixing screw 31. The ruler member 5 is attached to this bracket 6 and is held to extend and retract along a straight line passing through the axis of the outer cylinder member 4 in a plane perpendicular to the axis of the outer cylinder member 4. Therefore, in this ruler member 5, the tip of the ruler member 5 also serves as the guide stick in the above embodiment, and a guide pin 52 protrudes forward from its tip.

[0036] When using this pitch guide jig 2, first insert the inner cylinder member 3 onto the nose portion 12 from the tip side of the screw gun 1 and hold it in a position that surrounds the outside of the contact arm 17, then fasten the four fixing screws 31 to fix the inner cylinder member 3 so that its axis roughly coincides with the axis of the nozzle 11. At this time, it is desirable to arrange the four fixing screws 31 in a cross shape, both vertically and horizontally, when viewed from the tip side of the screw gun 1.

[0037] Once the inner cylinder member 3 is fixed to the screw gun 1, the outer cylinder member 4 is inserted onto the inner cylinder member 3 with the ruler member 5 oriented vertically as shown in Figure 5(a), or horizontally as shown in Figure 5(b), and the fixing screws 31 that secure the inner cylinder member 3 are introduced into the guide grooves 41 of the outer cylinder member 4. Once the ruler member 5 is set to a predetermined length, the preparation for screw driving is complete. To switch between vertical and horizontal orientation, the outer cylinder member 4 is temporarily removed from the inner cylinder member 3, rotated 90 degrees, and then reinserted onto the inner cylinder member 3. In this way, the same ease of operation as in the previously described embodiment can be obtained. Note that the cross-sectional shapes of the inner cylinder member 3 and outer cylinder member 4 in this embodiment can also be replaced with rounded squares, regular octagons, or other four-fold symmetrical shapes (shapes that have rotational symmetry and overlap themselves when rotated 90 degrees around an axis).

[0038] As described above, the pitch guide jig 2 of the invention disclosed herein has a double structure consisting of an inner cylinder member 3 and an outer cylinder member 4. First, the inner cylinder member 3 is fixed near the tip of the nose portion 12 of the screw gun 1. The inner cylinder member 3 is fixed to the nose portion 12 using a plurality of fixing screws 31 that move back and forth toward its axis, so that even if the shape of the nose portion 12 varies, its axis can be aligned with the axis of the nozzle 11. Furthermore, since the outer cylinder member 4 is rotatably fitted onto the inner cylinder member 3, the pivot point of the outer cylinder member 4 also coincides with the axis of the nozzle 11. By adopting this configuration, the ruler member 5 attached to the outer cylinder member 4 can be easily switched to a vertical, horizontal, or any other arbitrary orientation simply by rotating the outer cylinder member 4 around the inner cylinder member 3 while the inner cylinder member 3 remains fixed to the screw gun 1 body. Since the tip of the guide member 5 rotates on a concentric circle centered on the axis of the nozzle 11, regardless of the orientation of the guide member 5, the tip of the guide member 5 or the tip of the guide stick 51 attached to its tip can be correctly aligned at a constant pitch on any construction reference line without needing to readjust the length or position of the guide member 5.

[0039] Thus, even when driving screws in the vertical, horizontal, or any other direction, screws can be driven accurately along the construction reference line while maintaining the correct screw pitch. If the screw driving work is not performed in a straight line and is not continuous, the guide member 5 may get in the way, but in that case, the outer cylinder member 4 can be removed from the inner cylinder member 3. If the guide member 5 is needed again, the outer cylinder member 4 can be reattached to the inner cylinder member 3, and it can be used immediately without any troublesome adjustments.

[0040] Furthermore, this pitch guide jig 2 can be attached near the nozzle of various handheld tools that continuously eject screws, nails, staples, and other fastener components using compressed air or electric power, not just the screw gun 1 as exemplified.

[0041] Furthermore, the technical scope of the invention disclosed in this application should not be interpreted restrictively based on the exemplary embodiments, but rather conceptually based on the claims. When implementing the invention disclosed in this application, it is possible to appropriately modify the shape, structure, material, quantity, joining form, relative positional relationship, etc., of components not specifically specified in the claims, within a range that substantially equals or better than the exemplary embodiments in terms of effects and benefits. [Industrial applicability]

[0042] The invention disclosed herein can be widely used in construction and other work sites where a handheld tool that is continuously driven by trigger operation is used. [Explanation of Symbols]

[0043] 1. Screw gun 11 Injection port 12 Nose section 13 Magazines 14 Housing 15. Grip section 16 Contact Top 17 Contact Arm 18 Trigger 2. Pitch guide jig 3. Inner cylinder member 31 Fixing screws 4. Outer cylinder member 41 Guide groove 42 Introduction 43 Rotating part 44 Engagement protrusion 45 Fitting part 5 Ruler components 51 Guide Stick 52 Guide pins 53 divisions 6 brackets 61 Ruler member holding part 62 Set screws

Claims

1. An inner cylindrical member that is fitted onto the vicinity of the tip of the nose portion having a screw ejection port of a screw gun and fixed to the nose portion, An outer cylinder member is fitted onto the inner cylinder member and is held so as to be rotatable around the axis of the inner cylinder member, A ruler member with markings is attached to the circumferential surface of the outer cylindrical member so as to allow the length to the tip to be adjusted according to the desired screw pitch, It is equipped with, The inner cylinder member and the outer cylinder member are both cylindrical in shape. Fixing screws that move back and forth toward the axis of the inner cylinder member are screwed into three locations on the circumference of the inner cylinder member. By fastening the three fixing screws mentioned above and clamping the area near the tip of the nose portion from three sides, the inner cylinder member is fixed to the nose portion, Guide grooves are formed at three locations on the circumference of the outer cylinder member to introduce the shaft portion of the fixing screw that protrudes to the outside of the inner cylinder member. Each of the guide grooves is provided with an introduction portion that extends parallel to the axis of the outer cylinder member and opens at the rear end of the outer cylinder member, and a rotating portion that extends in the circumferential direction of the outer cylinder member, continuous with the introduction portion. By aligning the fixing screws introduced into each guide groove with the respective rotating parts, the outer cylinder member is rotated around the axis of the inner cylinder member, allowing the orientation of the ruler member to be switched between vertical and horizontal while keeping the tip of the ruler member on a concentric circle centered on the axis of the outer cylinder member. The ruler member is held via a bracket attached to the circumferential surface of the outer cylinder member, such that its length to the tip can be changed in the tangential direction of the circumferential surface of the outer cylinder member. A guide stick is attached to the tip of the ruler member, which extends in a direction perpendicular to the length direction of the ruler member within a plane perpendicular to the axis of the outer cylinder member. By adjusting the extension length of the guide stick to match the distance between the axis of the outer cylinder member and the ruler member, the tip of the guide stick is positioned on a parallel line of the ruler member passing through the axis of the outer cylinder member, and is configured to indicate the position directly above and directly to the side of the nozzle when the ruler member is held in a vertical and horizontal orientation, respectively. By aligning the tip of the guide stick with the head of a previously driven screw, it is possible to drive screws along any construction reference line at a constant screw pitch corresponding to the length of the ruler member. A pitch guide jig for a screw gun, characterized by the following features.

2. An inner cylinder member is fitted onto the tip of the nose portion of a screw gun, which has a screw ejection port, and is fixed to the nose portion. An outer cylinder member that is fitted onto the inner cylinder member, A ruler member with markings is attached to the circumferential surface of the outer cylindrical member so as to allow the length to the tip to be adjusted according to the desired screw pitch, It is equipped with, Both the inner and outer cylindrical members are cylindrical with a square, regular octagon, or other quadruple-symmetrical cross-section. Four fixing screws are screwed into the circumference of the inner cylinder member, which move back and forth toward the axis of the inner cylinder member. By fastening the four fixing screws mentioned above and clamping the area near the tip of the nose portion from all four sides, the inner cylinder member is fixed to the nose portion, Guide grooves are formed at four locations on the circumference of the outer cylinder member to introduce the shaft portion of the fixing screw that protrudes to the outside of the inner cylinder member. Each of the guide grooves is provided with an introduction portion that extends parallel to the axis of the outer cylindrical member and opens at the rear end of the outer cylindrical member. The outer cylinder member is fitted onto the inner cylinder member by introducing the fixing screws into the respective guide grooves, and by removing the outer cylinder member from the inner cylinder member, rotating it 90 degrees, and then fitting it onto the inner cylinder member again, the orientation of the ruler member can be switched between vertical and horizontal while keeping the tip of the ruler member on a concentric circle centered on the axis of the outer cylinder member. By aligning the tip of the ruler member with the head of a previously driven screw, it is possible to drive screws along any construction reference line at a constant screw pitch corresponding to the length of the ruler member. A pitch guide jig for a screw gun, characterized by the following features.

3. In the pitch guide jig for a screw gun described in claim 2, The ruler member is held via a bracket attached to the circumferential surface of the outer cylinder member so as to extend and retract along a straight line passing through the axis of the outer cylinder member in a plane perpendicular to the axis of the outer cylinder member. A pitch guide jig for a screw gun, characterized by the following features.

Images