JP3027876U - Connection structure of saw blade and handle - Google Patents

Abstract

(57) [Abstract] [Problem] To easily and quickly attach and detach a saw blade and a handle. A cut 5 is formed at a tip 2 of a handle E. A pair of holding pieces 7, 7 are formed by the cuts 5, a bolt rod 8 is inserted from the side thereof, and the nut 3 is screwed.
A notch 10 is formed at the base end 6 of the saw blade 1, and the notch 10
And lock the bolt rod 8.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a structure for connecting a saw blade and a handle.

[0002]

[Prior art]

 Conventionally, a structure in which a saw blade is detachably (replaceable) connected to a saw handle has a through hole at the base of the saw blade, and a cut for inserting the saw blade is provided at the tip of the handle. A hole was formed from the side, the base of the saw blade was inserted into the cut of this handle, and a bolt was inserted through the hole and the through hole in a skewered shape and tightened with a nut.

[0003]

[Problems to be solved by the device]

 However, when the handle of the saw is grasped by hand and a branch is cut by applying a large force, a bending moment acts on the connecting portion between the saw blade and the handle together with a large tensile force. The conventional connecting structure described above has a problem in that the tensile force and the bending moment cause rattling in a short period of time, and the saw blade "wobbles" with respect to the handle. Also, it was difficult to quickly attach and detach the saw blade.

[0004]

[Means for Solving the Problems]

 Therefore, in the connection structure according to the present invention, a small gap size cut is formed at the tip of the handle, and a pair of left and right elastically deformable holding piece portions are formed at the tip, and the pair of left and right holding piece portions are skewed. A bolt rod that is inserted in a circular shape, and a nut that is screwed to the threaded portion of the bolt rod is attached.Furthermore, a notch that opens upward is formed at the base end of the saw blade, and the base end is formed. The slits are inserted into the gaps between the holding pieces, and the bolt rods are locked in the notches of the saw blades so that the saw blades cannot be pulled out from the handle.

Further, a horizontal rod is provided so as to cross the cut of the handle to the left and right, and the saw blade is formed by notching a lower corner portion at the most proximal end thereof to form a hitting recess of the horizontal rod, and the saw blade is moved forward. Insert the base end of the saw blade into the cut of the handle in a tilted posture, and insert the saw blade 1 at the insertion depth where the contact recess of the saw blade contacts the side rod of the handle. Swing the tip upwards to lock the notch of the saw blade to the bolt rod, and then tighten the nut and the bolt rod so that the pair of left and right holding pieces approach each other. It is configured to be elastically deformed and to hold the upper end of the saw blade.

Further, the shape of the cut is such that the front end is open forward, upward and downward of the handle, and the middle to the proximal end is closed upward and downward by the upper wall portion and the lower wall portion, and is forward. Only the shape is open, and the forward extension position of the upper wall is more forward than the forward extension position of the lower wall, and the base end of the saw blade is tilted forward and downward. It is easy to insert in the break.

[0007]

[Embodiment of device]

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

In FIG. 8, reference numeral 1 denotes a (strip plate-shaped) saw blade, which is detachably attached (replaced) to the tip 2 of the handle E and is used for cutting an object such as a tree branch. Indicates the saw used.

To attach the saw blade 1, in the state shown in FIG. 2 of the same drawing and FIG. 9 (which is drawn as a separate figure), a saw 5 is formed on the cut 5 formed in the tip 2 of the handle E. Insert the base end 6 of the blade 1 and then rock the saw blade 1 upward (in the direction of arrow M) as shown in the solid line in FIG. 8 and in FIG. After that, if the tip 2 of the handle E is tightened with the nut 3, it can be fixed straight.

On the contrary, loosen the nut 3 and swing it from the solid line in FIG. 8 (FIG. 9) to the two-dot chain line in FIG. 8 (FIG. 10) to move the saw blade 1 from the handle E. Can be extracted.

A more specific description will be given with reference to the drawings. 1 to 7 show a handle E, and in the state diagrams showing the assembly of the handle E and FIGS. 8 to 10, the cut 5 at the tip 2 of the handle E is the same as or slightly larger than the thickness of the saw blade 1. With this small gap size, a pair of left and right elastically deformable holding pieces 7, 7 are formed at the tip 2 by the cut 5.

Reference numeral 8 is a bolt rod that inserts the pair of right and left holding pieces 7, 7 in a skewered shape. The nut 3 is screwed onto the threaded portion, and the bolt rod 8 and the nut 3 hold the bolt. The pieces 7, 7 are tightened so that they can be elastically deformed in the direction in which the cut 5 is reduced.

By the way, a wing nut is shown as the nut 3, so that the nut 3 can be easily screwed back and forth. And, it is the bent thin plate material 9 that forms the inner surface of the cut 5, and serves to reinforce.

A V-shaped notch 10 that opens upward is formed at the base end 6 of the saw blade 1, and the base end 6 is inserted into the cut 5 between the holding pieces 7, 7 as shown in FIG. , When it is rocked in the direction of arrow M (upward), the bolt rod 8 is locked in the notch portion 10 (when the nut 3 is tightened here), the saw blade 1 is pulled from the handle E as shown in FIG. It is fixed (connected) so that it does not come off.

As is clear from the figure, the bolt rod 8 is arranged at a position above the tip of the handle E. Reference numeral 11 denotes a horizontal rod which is provided so as to bridge the holding pieces 7 and 7 so as to cross the cut 5, and is located slightly rearward of the bolt rod 8 and at an intermediate position in the vertical direction of the handle E. In the saw blade 1, the lower corner of the most proximal end thereof is cut out to form a contact recess 12 for the horizontal rod 11.

As shown by the chain double-dashed line in FIG. 8 and in FIG. 9, the base end 6 is inserted into the cut 5 of the handle E 1 while the saw blade 1 is tilted forward and the contact concave portion of the saw blade 1 is inserted. Abut 12 on the horizontal rod 11. In this contact depth, the tip of the saw blade 1 is swung upward as indicated by the arrow M, and as shown by the solid line in FIG. 8 and FIG. To the bolt rod 8. Further, the nut 3 and the bolt rod 8 are tightened and elastically deformed in a direction in which the pair of right and left holding pieces 7, 7 are brought close to each other, and the base end 6 of the saw blade 1 is held and connected.

Further, as is clear from FIG. 7, the shape of the cut 5 is open forward, upward and downward of the handle E at the tip side, and the upper wall portion 13 and the lower wall portion 14 at the intermediate or base end side. Has a shape in which the upper and lower sides are closed and only opens to the front, and the forward extending position of the upper wall 13 is forward of the forward extending position of the lower wall 14, and the saw blade is 1 has a structure in which the base end 6 can be easily inserted into the cut 5 in a posture of tilting forward and downward (see the chain double-dashed line in FIG. 8 and FIG. 9).

When the saw is used in the connection completed state shown in FIG. 10, the saw blade 1 exerts a large pulling force indicated by an arrow F and a moment indicated by an arrow N on the handle E. At this time, the bolt rod 8 and the notch 10 are locked to withstand the pulling force F sufficiently, and at the same time, the bolt rod 8 and the horizontal rod 11 provide the couple force applied to the base end 6 of the saw blade 1. Withstands the above-mentioned moment N sufficiently.

[0019]

[Effect of device]

 (According to claim 1) By the engagement of the notch 10 and the bolt rod 8, the saw blade 1 can withstand an external force (see arrow F in FIG. 10) trying to pull out from the handle E. . Moreover, if the nut 3 is loosened slightly and the saw blade 1 is swung, the saw blade 1 can be quickly removed (without removing the nut 3) and replaced.

(According to the second aspect) A large moment (see arrow N in FIG. 10) acting on the saw blade 1 at the time of cutting an object can be sufficiently endured. Further, since the most proximal end of the saw blade 1 is surely hit when the saw blade 1 is attached, the work of attaching the saw blade 1 becomes smoother. Further (according to claim 3), the work of attaching and detaching the saw blade 1 becomes easy and reliable.

[Brief description of drawings]

FIG. 1 is a left side view of a handle.

FIG. 2 is a front view of a handle.

FIG. 3 is a right side view of the handle.

FIG. 4 is a plan view of a handle.

FIG. 5 is a bottom view of the handle.

FIG. 6 is a rear view of the handle.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is an explanatory view for connecting and attaching a saw blade and a handle.

FIG. 9 is an explanatory view showing a state in which the saw blade and the handle are being connected.

FIG. 10 is a diagram showing a state in which the saw blade and the handle are completely connected.

[Explanation of symbols]

 E Handle 1 Saw blade 2 Tip 3 Nut 5 Cut 6 Base end 7 Holding piece 8 Bolt rod 10 Notch 11 Side rod 12 Recess 13 Upper wall 14 Lower wall

Claims (3)

[Scope of utility model registration request] 1. A cut 5 having a small gap size is formed on a tip 2 of a handle E, and a pair of left and right elastically-deformable holding pieces 7, 7 are formed on the tip 2, and a pair of left and right holding pieces 7 are formed. , 7 are inserted in a skewered manner, and a nut 3 to be screwed to the threaded portion of the bolt rod 8 is attached, and the saw blade 1
The base end 6 is formed with a notch 10 which opens upward, and the base end 6 is inserted into the cut 5 between the holding piece parts 7, 7 so that the notch 10 of the saw blade 1 is provided with the bolt rod. A structure for connecting a saw blade and a handle, characterized in that the saw blade 1 is structured so as not to be pulled out from the handle E. 2. A horizontal rod 11 is provided so as to cross the cut 5 of the handle E to the left and right, and the saw blade 1 is formed with a notch 12 at the lowermost base end thereof to form a recess 12 for hitting the horizontal rod 11. , The saw blade 1 is tilted forward and the base end 6 of the saw blade 1 is inserted into the cut 5 of the handle E, and the contact recess 12 of the saw blade 1 is abutted against the horizontal rod 11 of the handle E. With the insertion depth in contact, the tip of the saw blade 1 is swung upward, the notch 10 of the saw blade 1 is locked to the bolt rod 8, and the nut 3 and The saw according to claim 1, wherein the bolt rod 8 is tightened to elastically deform the pair of left and right holding pieces 7, 7 so as to hold the base end 6 of the saw blade 1. Connection structure of blade and handle. 3. The shape of the cut 5 is open to the front, the upper side, and the lower side of the handle E on the front end side, and the upper wall portion on the intermediate or proximal end side.
13 and the lower wall portion 14 is closed at the upper and lower sides and has a shape that opens only forward, and the forward extending position of the upper wall portion 13 is forward of the forward extending position of the lower wall portion 14. 3. The saw blade-handle connection structure according to claim 2, wherein the saw blade 1 is configured to be easily inserted into the cut 5 while the saw blade 1 is tilted forward and downward.