JP5165481B2 - Jigsaw - Google Patents

Description

  The present invention relates to a jigsaw having a configuration in which a guard frame is disposed in front of a blade.

A related jigsaw is described in Patent Document 1.
The jigsaw of Patent Document 1 converts the rotation of the motor into a vertical reciprocating motion by a reciprocating mechanism and transmits it to the rod 101. As shown in FIGS. In this configuration, the attached blade 103 is moved up and down.
The rod 101 is configured such that a connecting portion with the reciprocating mechanism portion (not shown) is accommodated in the housing 102, and the lower portion of the rod 101 protrudes downward from the through hole portion 102 h of the housing 102. Yes.
Generally, as shown in FIG. 8B, a bearing 105 of a rod 101 is fixed to the back side (upper side) of the through hole 102h of the housing 102, and the outer side (lower side) of the bearing 105 is fixed. A ring-shaped sealing material 106 is disposed on the surface. Further, a washer 107 for preventing the sealing material 106 from coming off is fixed to the lower side of the sealing material 106 by press-fitting.
A guard frame 108 is fixed to the lower side of the front portion of the housing 102, and the guard frame 108 can prevent an object from inadvertently contacting the blade 103.

JP 2003-191203 A

  However, in the above-described jigsaw, since the seal member 106 is prevented from coming off by the washer 107 press-fitted into the through hole 102h of the housing 102, it is difficult to replace the seal member 106 alone.

  The present invention has been made to solve the above problems, and the problem to be solved by the present invention is that the sealing material stored in the through hole portion of the jigsaw housing can be easily replaced alone. It is to be.

The above-described problems are solved by the inventions of the claims.
In the first aspect of the present invention, a through hole formed in the lower surface of the housing has a bearing fixed on the back side and a ring-shaped sealing material disposed on the outer side, and a rod is axially disposed between the bearing and the sealing material. A blade is attached to the tip of the rod that is inserted in a reciprocable state and protrudes downward from the through-hole portion of the housing, and a guard frame supported by the housing is disposed in front of the blade. And a pair of left and right flanges formed on the lower surface of the housing with the through-hole portion interposed therebetween, and extending along the lower surface of the housing. The left and right proximal ends of the guard frame configured to be fitted to the flange, and the left and right proximal ends of the guard frame are fitted to the left and right flanges. A presser plate that is inserted between a base end portion and a lower surface of the housing and holds the sealing material housed in the through-hole portion from below and prevents the sealing material from coming off. .

  According to the present invention, the sealing material can be removed from the through-hole portion of the housing by pulling out the holding plate inserted between the left and right base end portions of the guard frame and the lower surface of the housing. Further, after the seal material is replaced, a new seal material can be prevented from coming off again by inserting the presser plate between the base end portion of the guard frame and the lower surface of the housing. As described above, since the sealing material can be removed or the sealing material can be prevented from being detached by inserting and removing the presser plate, the sealing material can be easily replaced by itself.

According to the invention of claim 2, the guard frame is configured to be able to widen the distance between the left and right base ends or to narrow the distance between the left and right base ends. The left and right base end portions are fitted to the left and right flanges of the housing by widening the gap between the bottom surfaces of the housing, and the presser plate includes the left and right base portions of the guard frame. A holding claw for holding the end portion in a widened state is provided.
For this reason, by inserting a holding plate between the left and right base ends of the guard frame and the lower surface of the housing, the holding base of the holding plate holds the left and right base ends of the guard frame and the left and right flanges of the housing. Can be held in a fitted state. Thereby, it is not necessary to fix the left and right base end portions of the guard frame to the housing with screws or the like, and the number of parts can be reduced.

According to a third aspect of the present invention, the guard frame is made of an elastic material, and is biased in a direction in which the left and right base ends are extended to a position where it can be fitted to the left and right flanges of the housing. And
For this reason, since the base end part of a guard frame can be fitted to the collar part of a housing using elastic force, attachment of a guard frame becomes easy. In addition, by fitting the gap between the base end portions of the guard frame against the elastic force, the fitting between the left and right base end portions of the guard frame and the left and right flange portions of the housing can be released.

According to the invention of claim 4, the presser plate is formed with a through hole through which the rod is inserted.
That is, the presser plate is inserted between the left and right base ends of the guard frame and the lower surface of the housing, and the rod is inserted into the through hole of the presser plate, thereby preventing the presser plate from coming off.

  According to the present invention, the seal material housed in the through hole portion in the jigsaw housing can be easily replaced by itself.

(Embodiment 1)
Hereinafter, the jigsaw according to the first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is an overall longitudinal sectional view of the jigsaw according to the first embodiment, and FIG. 2 is a view taken in the direction of arrows II-II in FIG. 3 is an enlarged view of the rod, blade, and guard frame portions of FIG. 1, FIG. 4 is an enlarged view of the arrow IV in FIG. 2, FIG. 5 is an enlarged view of the arrow V in FIG. 3, and FIG. It is a VI-VI arrow line view. FIG. 7A is a perspective view of the presser plate, and FIG. 7B is a perspective view of the guard frame.
Here, front and rear, right and left, and top and bottom in the figure correspond to front and rear, left and right and top and bottom of the jigsaw.

<Outline of jigsaw 10>
As shown in FIG. 1, the jigsaw 10 is a yarn saw that is operated with one hand. The rotation of the motor 12 is converted into a vertical reciprocating motion by a reciprocating mechanism 14 and transmitted to a vertically oriented rod 16. The blade 18 (saw blade) attached to the lower end portion of the blade is moved up and down. The motor 12 is housed in a main body housing 10m, and a metal gear housing 10w is connected and fixed to the front end of the main body housing 10m. The gear housing 10w houses the reciprocating mechanism 14 and the central portion of the rod 16 and the like.

As shown in FIG. 3, the upper and lower portions of the rod 16 are supported by an upper bearing 21 and a lower bearing 22 so as to be vertically movable. The upper bearing 21 is press-fitted and fixed in the upper through hole 10u of the gear housing 10w, and the lower bearing 22 is press-fitted and fixed in the lower through-hole 10d of the gear housing 10w. Further, the lower through-hole portion 10d accommodates a seal member 23 that is a ring-shaped elastic body on the lower side of the lower bearing 22, and the seal member 23 seals between the gear housing 10w and the rod 16. It has been. Further, on the lower surface 10z of the gear housing 10w, as will be described later, there are a pressing plate 24 for preventing the sealing material 23 from coming off and a guard frame 25 for preventing objects from inadvertently contacting the blade 18. It is installed.
A holder 16x is fixed to the projecting end of the rod 16 projecting from the lower through hole 10d (the lower bearing 22, the seal material 23) of the gear housing 10w, and the blade 18 is attached to the holder 16x. ing.

A guide rail 14r that constitutes a part of the reciprocating mechanism 14 is fixed to the rod 16 by bolting on the rear side of the portion housed in the gear housing 10w. As shown in FIG. 3 and the like, the guide rail 14r is a rail having a U-shaped cross section, and is formed to extend in the direction perpendicular to the paper surface of FIG. And the front-end | tip part of the output shaft 14p is engage | inserted by the groove part of the said guide rail 14r so that a movement along the groove part is possible.
The output shaft 14p is configured to rotate around the central shaft 14c in response to the rotational force of the motor 12. That is, the output shaft 14p is configured to perform a circular motion around the central axis 14c on a virtual vertical plane perpendicular to the paper surface of FIG. The circular motion of the output shaft 14p is converted into a reciprocating motion in the vertical direction by being absorbed by the guide rail 14r in the horizontal direction (perpendicular to the paper surface) and transmitted to the rod 16.
Since the guide rail 14r is bolted to the rod 16 as described above, the guide rail 14r can be removed from the rod 16 by loosening the bolt (not shown). Then, the rod 16 from which the guide rail 14r has been removed can be pulled downward from the upper bearing 21, the lower bearing 22, the seal material 23, and the like of the gear housing 10w.

As shown in FIG. 1, the gear housing 10w is configured such that the rear side of the lower through-hole portion 10d projects downward, and the base 17 is pressed against the upper surface of the workpiece at the lower end position of the gear housing 10w. Is installed. Further, a back roller 19 that guides the blade 18 by pressing the blade 18 from the rear on the base 17 is mounted at a lower end position of the gear housing 10w in a rotatable state.
As shown in FIG. 1, a resin-made top housing 10f is connected and fixed to the upper portion of the main body housing 10m and the gear housing 10w, and a grip portion 10g to be held by the user is provided on the top housing. ing. A trigger-type switch lever 8 that is pulled by the user with a fingertip is provided at the tip of the grip portion 10g.

<About guard frame 25>
The guard frame 25 is configured by bending a single steel wire having a predetermined elasticity as shown in FIG. As shown in FIGS. 3 and 5, the guard frame 25 includes a U-shaped vertical frame portion 26 arranged in a vertical direction, and left and right horizontal frames folded at right angles on the left and right upper ends of the vertical frame portion 26. The side surfaces of the frames 27 and 28 are formed in an inverted L shape. As shown in FIG. 7B, the left and right horizontal frame portions 27, 28 are symmetrical in plan, and are composed of inclined portions 27a, 28a, parallel portions 27h, 28h, and end portions 27c, 28c. Has been. The inclined portions 27a and 28a of the left and right horizontal frame portions 27 and 28 are inclined so as to expand left and right with respect to the upper end of the U-shaped vertical frame portion 26. In addition, the parallel portions 27 h and 28 h of the left and right horizontal frame portions 27 and 28 are held in parallel at intervals wider than the interval of the vertical frame portions 26. Further, the end portions 27c and 28c of the left and right horizontal frame portions 27 and 28 are bent outward at right angles to the parallel portions 27h and 28h. The parallel portions 27h and 28h of the left and right lateral frame portions 27 and 28 are fitted to a pair of left and right flanges 11 formed on the lower surface 10z of the gear housing 10w as shown in FIGS. It is configured.

<About the buttocks 11>
The pair of left and right flanges 11 are members for attaching the guard frame 25 and a presser plate 24 to be described later to the gear housing 10w, and are formed on the lower surface 10z of the gear housing 10w as shown in FIG. The left and right collar portions 11 are rail-like members that are symmetrical in the shape of a substantially L-shaped cross section, and are formed to extend in the front-rear direction across the lower through-hole portion 10d (see FIG. 6). ). As shown in FIG. 4, the left and right flange portions 11 are frames that support the left and right lateral frame portions 27 and 28 (parallel portions 27 h and 28 h) of the guard frame 25 from the lower side and the outer side in the width direction. The shelf portion 11t is formed to extend in the front-rear direction. For this reason, the space | interval of the horizontal frame parts 27 and 28 of the guard frame 25 is extended along the lower surface 10z of the gear housing 10w inside the left and right collar parts 11, and the left and right horizontal frame parts 27 and 28 are made into right and left collar parts. The frame 11 can be hung on the frame shelf 11t.
Further, on the frame shelf portion 11t of the flange portion 11, a step portion 11d that supports an end edge of the presser plate 24 described later from the lower side and the outer side in the width direction is formed to extend in the front-rear direction. Here, the height position of the upper surface of the step portion 11d is set to be equal to the height positions of the horizontal frame portions 27 and 28 of the guard frame 25 placed on the frame shelf portion 11t.
That is, the horizontal frame portions 27 and 28 of the guard frame 25 correspond to the base end portion of the present invention.

<About the presser plate 24>
The holding plate 24 prevents the sealing material 23 housed in the lower through-hole portion 10d of the gear housing 10w from coming off, and fits the left and right horizontal frame portions 27 and 28 of the guard frame 25 and the left and right flange portions 11 to each other. It is a member for holding in a combined state.
As shown in FIG. 7 (A), the presser plate 24 is a substantially rectangular flat plate formed so that the front center protrudes slightly forward, and a through hole 24h through which the rod 16 is inserted is located at the center front side position. Is formed. And it is comprised so that the sealing material 23 can be pressed from the downward direction in the peripheral part of the said through-hole 24h, as shown in FIG.
As shown in FIG. 4, the left and right width dimensions of the presser plate 24 are set to be equal to the distance W from the left end to the right end of the step portion 11 d in the left and right flange portions 11. Further, the thickness dimension of the pressing plate 24 is set equal to the distance D from the upper surface of the step portion 11d of the flange portion 11 to the peripheral edge of the lower through-hole portion 10d on the lower surface 10z of the gear housing 10w.
Further, on both sides of the rear end portion of the presser plate 24, as shown in FIG. 7A, they are placed on the step portions 11 d of the left and right flange portions 11 and the left and right horizontal frame portions 27 and 28 of the guard frame 25. A rectangular plate portion 24x is formed. And the holding nail | claw 24r formed so that it might protrude below was formed in the width direction inner side of the left-right rectangular board part 24x. In the left and right holding claws 24r, as shown in FIGS. 3 and 5, etc., the presser plate 24 is placed on the step portions 11d of the left and right flange portions 11 and the left and right horizontal frame portions 27 and 28 of the guard frame 25. In this state, the guard frame 25 is disposed on the inner side in the width direction of the lateral frame portions 27 and 28. As a result, the left and right horizontal frame portions 27 and 28 of the guard frame 25 cannot be moved inward in the width direction by the action of the left and right holding claws 24r, and are held in a fitted state with the left and right collar portions 11.

<Installation procedure of guard frame 25 and presser plate 24>
The guard frame 25 and the presser plate 24 are attached before the rod 16 is inserted into the upper bearing 21 and the lower bearing 22 of the gear housing 10w.
First, the distance between the left and right horizontal frame portions 27 and 28 in the guard frame 25 is narrowed against the elastic force and disposed between the left and right flange portions 11 formed on the lower surface 10z of the gear housing 10w. Next, the space between the left and right horizontal frame portions 27 and 28 is extended along the lower surface 10z of the gear housing 10w by elastic force, and the parallel portions 27h and 28h of the horizontal frame portions 27 and 28 are extended to the flange portion 11 of the gear housing 10w. To the frame shelf 11t (see FIG. 4). At this time, as shown in FIG. 6, the end portions 27 c and 28 c of the horizontal frame portions 27 and 28 are respectively hung on the rear ends of the left and right flange portions 11. In this state, the guard frame 25 is held in a fitted state with the left and right flanges 11 by its own elastic force.

  Next, the ring-shaped sealing material 23 is fitted into the lower through-hole portion 10d of the gear housing 10w. After the seal material 23 is mounted, the presser plate 24 is moved from the front to the rear between the step portions 11d of the left and right flange portions 11, the horizontal frame portions 27 and 28 of the guard frame 25, and the lower surface 10z of the gear housing 10w. Inserted. The presser plate 24 is inserted to a position where the through hole 24h of the presser plate 24 is concentric with the lower through hole portion 10d of the gear housing 10w. Thereby, the sealing material 23 is pressed from below by the peripheral edge portion of the through hole 24 h of the pressing plate 24. Further, the left and right holding claws 24 r of the presser plate 24 are arranged on the inner side in the width direction of the horizontal frame portions 27 and 28 of the guard frame 25, and the horizontal frame portions 27 and 28 of the guard frame 25 are fitted to the left and right flange portions 11. Kept in a state.

Next, as shown in FIG. 3 and the like, the rod 16 is inserted into the through hole 24h, the seal member 23, the lower bearing 22 and the upper bearing 21 of the presser plate 24 from below. In this state, the presser plate 24 does not come off from the left and right flanges 11, and the attachment of the guard frame 25 and the presser plate 24 is completed.
After the rod 16 is inserted, the guide rail 14r is fixed to the rear side surface of the rod 16 by bolting. When the gear housing 10w is closed, the output shaft 14p of the reciprocating mechanism 14 is fitted into the groove portion of the guide rail 14r.
When removing the guard frame 25 and the presser plate 24, the rod 16 is pulled out in the reverse procedure to that described above, and then the presser plate 24 and the guard frame 25 are removed in this order.

<Advantages of Jigsaw 10 according to this Embodiment>
According to the jigsaw 10 according to the present embodiment, by pulling out the holding plate 24 inserted between the left and right lateral frame portions 27 and 28 of the guard frame 25 and the lower surface 10z of the gear housing 10w, the lower side of the gear housing 10w. It becomes possible to remove the sealing material 23 from the through-hole portion 10d. Further, after the seal material 23 is replaced, a new seal material 23 is prevented from coming off again by inserting the holding plate 24 between the lateral frame portions 27 and 28 of the guard frame 25 and the lower surface 10z of the gear housing 10w. Can be achieved. As described above, since the sealing material 23 can be removed or the sealing material 23 can be prevented from being detached by inserting and removing the holding plate 24, the sealing material 23 can be easily replaced alone.

Further, by inserting the holding plate 24 between the left and right horizontal frame portions 27 and 28 of the guard frame 25 and the lower surface 10z of the gear housing 10w, the holding frame 24r of the holding plate 24 holds the left and right sides of the guard frame 25. The frame portions 27 and 28 and the left and right flange portions 11 of the gear housing 10w can be held in a fitted state. Thereby, it is not necessary to fix the left and right horizontal frame portions 27 and 28 of the guard frame 25 to the gear housing 10w with, for example, screws, and the number of parts can be reduced.
Further, the guard frame 25 is made of an elastic material, and is biased in a direction to expand the left and right horizontal frame portions 27 and 28 to a position where the guard frame 25 can be fitted to the left and right flange portions 11 of the gear housing 10w. For this reason, since the horizontal frame portions 27 and 28 of the guard frame 25 can be fitted to the flange portion 11 of the gear housing 10w by using elastic force, the attachment of the guard frame 25 is facilitated.
Further, since the presser plate 24 has a through hole 24h through which the rod 16 is inserted, the presser plate 24 can be prevented from coming off.

<Example of change>
Here, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in the jigsaw 10 according to the present embodiment, an example in which the horizontal frame portions 27 and 28 of the guard frame 25 are pressed from the inner side in the width direction by the holding claws 24r formed on the presser plate 24 has been shown, but instead of the holding claws 24r. A configuration in which rail-like protrusions are formed on the lower surface of the pressing plate 24 is also possible.
In the present embodiment, the holding claw 24r is formed on the presser plate 24. However, a configuration in which the holding claw 24r is formed on the left and right flange portions 11 side is also possible.

1 is an overall longitudinal sectional view of a jigsaw according to Embodiment 1 of the present invention. It is an II-II arrow line view of FIG. It is an enlarged view of the part of the rod in FIG. 1, a braid | blade, and a guard frame. FIG. 4 is an enlarged view taken along arrow IV in FIG. 2. FIG. 4 is an enlarged view taken along arrow V in FIG. 3. FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 4. It is a perspective view (A figure) of a holding plate, and a perspective view (B figure) of a guard frame. It is the side view (A figure) of the conventional jigsaw, and the expanded longitudinal cross-sectional view (B figure) of the bearing part of the said jigsaw.

Explanation of symbols

10w... Gear housing 10u... Upper through hole 10d... Lower through hole 10z. 16... Rod 18... Blade 22... Lower bearing 23... Sealing material 24 r... Holding claw 24. Through hole 25... Guard frame 27, 28 .. Horizontal frame part (base end part)

Claims (4)

A bearing is fixed to the inner side of the through hole formed in the lower surface of the housing, and a ring-shaped sealing material is arranged on the outer side. A rod can reciprocate in the axial direction between the bearing and the sealing material. It is a jigsaw that is configured to have a blade attached to the tip of the rod that is inserted and protrudes downward from the through-hole portion of the housing, and a guard frame supported by the housing is disposed in front of the blade. And
A pair of left and right collars formed on the lower surface of the housing with the through hole therebetween, and
Left and right base end portions of the guard frame, which are formed to extend along the lower surface of the housing, and can be fitted to the left and right flanges;
Inserted between the left and right base ends of the guard frame and the lower surface of the housing in a state where the left and right base ends of the guard frame are fitted to the left and right flanges, and stored in the through-hole portion. Holding the sealing material made from below, and a holding plate for preventing the sealing material from coming off;
The jigsaw characterized by having. The jigsaw according to claim 1,
The guard frame is configured to increase the distance between the left and right base ends, or to reduce the distance between the left and right base ends,
The left and right base end portions of the guard frame are widened along the lower surface of the housing to fit the left and right base end portions with the left and right flange portions of the housing.
The jig plate is provided with a holding claw for holding the presser plate in a state where the distance between the left and right base ends of the guard frame is widened. The jigsaw according to claim 2, wherein
The said guard frame is comprised with the elastic material, and is urged | biased in the direction which spreads the right and left base end part to the position which can be fitted with the right and left collar part of the said housing. A jigsaw according to any one of claims 1 to 3,
The jig plate is characterized in that a through hole through which the rod is inserted is formed in the presser plate.

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