JPH088803Y2 - Folding saw, flip-up rotation type, with easy replacement of saw blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a folding saw, that is, a base of a saw blade is pivotally supported with respect to a saw handle so that the saw blade can be mounted on the saw handle when not in use. This type of saw is stored in the prepared vertical groove, which is convenient for carrying and is also useful in terms of safety. For this type of saw, it is devised to improve the operability including the replacement of the saw blade and its attachment / detachment method. It proposes a flip-up foldable folding saw that is easy to attach and detach the saw blade.

(Prior Art) Japanese Patent Application No. 61-1803 discloses a latching device for latching the unfolded state of a saw blade with respect to a folding saw. It is difficult to handle with one hand because it is necessary to rotate the saw blade around the support part with respect to the handle after removing the. This is inconvenient when used for work on an unstable scaffold, such as unloading pruning.

Although it is not a foldable type, there is also a pruning saw in which a replaceable blade type saw blade is inserted into a grip handle that is bent so that it fits comfortably in the palm, and fixed with screws. When the leather case is used by suspending it from the waist belt, there is a hindrance that even if the saw blade can be pulled out by one-handed operation, the leather case is caught on the branch and hinders work at high places.

(Problems to be solved by the device) One hand has already been blocked by an unstable scaffold, which is often encountered in pruning for lowering branches of tall trees and assembling temporary frames for concrete work. Folding saw that can be easily unfolded from the handle of the saw blade with one hand, even if it is in such a posture, and especially a replacement blade designed to easily attach and detach a cut saw blade It is the purpose of this invention to propose a folding fold saw.

(Means for Solving the Problem) The present invention is a saw holder that is composed of a pair of saw replacement blades having a round hole at the tail end and two mating shell halves that can sandwich the saw blade, and a saw holder that can be combined with a stalk. In a folding saw equipped with a shaft support that holds a saw replacement blade at one end of a saw holder so as to be rotatable around the center of a round hole at the tail end of the saw holder, the shaft support is one of two mating shell halves. A bushing that is fixed to the inside of the holder so that it cannot rotate, and an outer end of the spiral spring whose inner end is locked to the outer circumference of the bushing are enclosed to surround the spiral spring and can be rotated around the bushing. The restraining ring is mainly composed of a spring case, an operating shaft that fits in the shaft hole of the bushing and is rotatable, and a retaining ring of a saw blade that can slide in the axial direction by screw engagement with the operating shaft. , A non-circular indentation formed on the outside of the other half of the two mating shells. A holding shaft neck that can fit under the neck of the mating detent head through the mounting hole that opens at the bottom of the non-circular recess and that matches the tail end round hole of the saw blade, and a step shaft neck with a smaller diameter than this The saw blade has a slit that opens a round hole at its tail end toward the edge of the tail end around it with a minimum inner width corresponding to the outer diameter of the step shaft neck, and this slit. The spring case has a notch that makes a pair at the edge of the tail end by sandwiching it and the spring case has a saw blade on the upper surface facing the other half of the two mating shells across the saw blade. The holder has a protrusion that locks the blade, and the holder engages with each of the pair of cuts at the expanded and retracted positions of the saw blade to lock the saw blade, and the spring-loaded tumbler knob and the cut by the tumbler knob. Tightening a spiral spring that urges the saw blade from the retracted position toward the deployed position under engagement with one of the And having a stopper for engaging the spring case to ensure, easy attachment and detachment of the saw band blades, a splash up revolvable folding saw.

Now, as shown in FIG. 1, it is easy to attach and detach the saw blade according to the present invention.
A flip-up rotary folding saw is shown in a projected view of a side surface (a), an upper surface (b) and a lower surface (c) in a deployed position, in which 1 is a saw blade and 2 is a saw blade 1 at a base end thereof. Saw holder for sandwiching 3 with tie handle, 4 with front edge of holder 2 saw replacement blade 1
A shaft support tool for rotatably holding the tail end of the saw holder 2 will be described later in detail. Here, the saw holder 2 is a sheet metal forming process in the illustrated example. , 2b, and 5 is a tumbler knob provided on the back of the saw holder 2, and 6 is a spring pin for turning the tumbler knob 5.

FIG. 2 is a perspective view of the disassembled parts of the folding saw showing the unfolded position of the saw blade in FIG. 1. First, in FIG. A bushing fixed non-rotatably by locking the circular hole 2f and the detent 7c, 8 is a spring case rotatable around the bushing 7, 9 is a spiral spring, and 10 is a case bottom cover.

The bushing 7 has a body 7a, a flange 7b, a detent 7c and a screw leg 7d, and a chordwise cut provided on the outer periphery of the body.
The inner end 9a of the spiral spring 9 is locked to 7e.

The spring case 8 includes a peripheral wall 8b having a notch 8a for locking the outer end 9b of the spiral spring 9, and a top wall that spreads by covering the peripheral wall 8b.
8c, and the top wall 8c is provided with a countersink recess 8d for accommodating the flange 7b of the bushing 7 and a central hole 8e concentric with the trunk 7a of the bushing 7 and in addition to the top wall 8c. A trapezoidal projection 8f protruding on a part of the upper surface and an angular projection 8g partially projecting from the outer circumference of the top wall are provided.

The body 7a of the bushing 7 is fitted into the center hole 8e of the spring case 8 and the inner end 9a of the spiral spring 9 is cut into the bushing 7e.
Similarly, the outer end 9b is fitted into the notch 8a of the spring case 8, and then the barrel bottom spring assembly 11 in which the peripheral wall 8b of the spring case 8 is covered with the case bottom lid 10 is fitted with a washer 12 and the case bottom lid 10 is inserted. Bushing 7 protruding from the bottom hole 10a of the
Fit the detent 7c (hexagonal body in the illustrated example) into the non-circular hole 2f (hexagonal hole in the illustrated example) of the two mating shell halves 2a,
The nut 7f is fixed to the outer surface of the two mating shell halves 2a via the spring washer 13.

At this time, the spiral spring 9 causes the angular protrusions of the spring case 8 to accumulate under the force of the spring force capable of maintaining the unfolded posture of the saw blade which will be stretched later.
8g is locked to a stopper 2g provided on the two mating shell halves 2a.

Next, the operating shaft 14 is inserted into the shaft hole 7g of the bushing 7, and the pressing ring 15 of the saw blade is screw-engaged on the flange side of the bushing 7 with the screw portion 14b having the operating rotary knob 14a formed at the opposite end.

Stop ring 15 by screwing setscrew 16 onto the screw end of operating shaft 14
To prevent it from slipping out.

The restraining ring 15 has a detent neck 15a that fits in the non-circular recess 2c formed on the other side 2b of the two mating shell halves, and the saw ring is changed below the detent neck 15a. Holding shaft neck 15b that can accommodate the round hole 1a prepared at the tail end of the blade 1
And a step shaft neck 15c having a smaller diameter than this, the holding shaft neck 15b passes through the mounting hole 2d opened at the bottom of the non-circular recess 2c, faces the flange 7b of the bushing 7, and is thus operated. By the rotation of the operating shaft 14 by the rotary knob 14a, the restraining ring 15 screw-engaged with the screw portion 14b thereof becomes movable along the axial direction of the operating shaft 14.

The saw blade 1 has a round hole 1a at its tail end facing the edge of the tail end around it, and a slit 1b that opens with a minimum inner width corresponding to the outer diameter of the step shaft neck 15c. The cutouts 1c and 1d, which are separated from the opening and sandwich this, and which make a pair at the edge of the tail end, are prepared by adding them to the round hole 1a.

Here, the saw blade 1 is inserted between the bushing 7 fixed to the two mating shell halves 2a and the spring case 8 combined with the bushing 7, and the two mating shell halves 2a. Since it is necessary to insert through the clearance between the butt edges of 2b, a step 2h is formed on the edge of the two two mating shell halves 2b in this example, so the saw blade 1 has its cutout 1b formed in the spring case. 8
While being engaged with the trapezoidal protrusion 8f on the upper surface of the spring, it is possible to rotate around the axis of the restraining ring 15 together with the spring case 8, and the biasing force of the spiral spring 9 in the retracted posture due to this rotation is exerted. It is urged by the tendency of development.

Therefore, the tumbler knob 5 which is used to hook the cut 1c of the saw blade 1 so as to maintain the stored attitude of the saw blade is pivotally supported on the saw holder 2 by the spring pin 6, where 5a is engaged with the cut 1c. Locking piece, 5b, 2i, 2j are pin holes, 2k, 21
Is a receiving hole of the tumbler knob 5, 5c is a spring receiving piece that uses the tumbler knob 5 as a spring device, 2m and 2n are locking notches of a leaf spring 17 having a trapezoidal holding portion by two-step bending, and 2p and 2q are saws. Spacer holding tongues of the holder 2, 2r, 2s, 2t and 2u are holding holes of the fixing screw 18, and 2w and 2x are unfolding tongues of the saw blade.

The joint handle 3 can be used as a saw handle by pressing the saw holder 2 united with a set screw 18 and fixing it with an appropriate adhesive, and here, 3a is a slit for accommodating and protecting the tooth tips when the saw blade is folded. Also, 3b is a hanging holding hole.

(Operation) The folding saw having the above-described structure can be easily carried in a safe folding posture of the saw blade, for example, when working at a high place, and at the time of use, the tumbler knob 5 is simply pushed to disengage the tip of the folding saw. The biasing force stored in the spiral spring 9 in the spring case 8 causes the saw blade to rebound and pivot, so that the saw blade occupies the deployed position. At this time, the tail end of the saw blade is held by the steadying tongue 2w, Since it is sandwiched between 2x and the locking piece 5a of the tumbler knob 5 re-engages the cut 1d at the tail end, it is possible to stably perform sawing work such as branch lowering and on-site cutting of a concrete temporary frame.

When you finish using it, you can easily guide it to the folded position by supporting the back of the saw blade and rotating the saw handle against the spiral spring 9, and at that location, the tumbler knob makes it easy to hook it in the initial state. Can be reproduced.

Next, when the saw blade is cut off, by turning the operation rotary knob 14a, the screw leg 14b of the operation shaft 14 moves the saw blade restraining ring 15 as shown in the sectional view of the main part of FIG. Push it upward in the figure, and when the step shaft neck 15b reaches the same level as the round hole 1a at the tail end of the saw blade, open the slit 1b facing this step shaft neck 15b.
The saw replacement blade 1 can be easily and easily replaced by pulling it out so as to pass through c, inserting the substitute saw replacement blade 1 in the reverse procedure, and rotating the operation rotary knob 14a in the reverse direction.

(Example) As a pruning saw for lowering branches of a tall tree, safe sawing at a high place can be performed by one hand operation.

In addition, on-site cutting of temporary concrete frames, especially on-site cutting where one hand is blocked, can be performed without any inconvenience.

(Effect of the invention) The flip-up rotary folding fold saw, which is easy to attach and detach the saw blade, can be used to easily turn a sharp blade into a different blade by simply turning the operation knob. In addition, it can be easily carried in a safe folding position, and even when using it, by simply holding down the tumbler knob, the saw blade can be flipped up and rotated to easily and securely take the deployed position. Therefore, the practical benefits are significant.

[Brief description of drawings]

 FIG. 1 is a front view, a top view and a bottom view, FIG. 2 is an exploded perspective view, and FIG. 1 ... Saw replacement blade, 2 ... Saw holder 2a, 2b ... Half of two mating shells 3 ... Joint, 4 ... Shaft support 5 ... Tumbler knob, 7 ... Bushing 8 ... Spring case, 9 ... Spiral spring 14 ... Operation Rotation knob, 15 ... Saw replacement blade restraining ring 15a ... Detent neck, 15b ... Holding shaft neck 15c ... Step shaft neck, 17 ... Leaf spring

Claims (1)

[Scope of utility model registration request] 1. A saw replacement blade 1 having a round hole 1a at its tail end, and a pair of two mating shell halves 2a, 2b capable of holding the saw blade,
In a folding saw provided with a saw holder (2) which can be combined with a joint handle (3), and a shaft support (4) for rotatably holding a saw replacement blade (1) at one end of the saw holder around a center of a circular hole (1a) at its tail end. The shaft support 4 has a bushing 7 fixed to one of the two mating shell halves 2a and fixed to the non-rotatable 2f, 7c inside the holder 2, and a spiral spring 9 having an inner end 9a locked to the outer circumference of the bushing 7. A spring case 8 that locks the outer end 9a of the bushing 8a to surround the spiral spring and is rotatable around the bushing 7, and an operation shaft 14 that is rotatable by being fitted in a shaft hole 7g of the bushing 7. It consists mainly of a saw blade restraining ring 15 that can slide in the axial direction by screw engagement with this operating shaft, and the restraining ring 15 is formed on the outside of the other 2b of the two mating shell halves. Under the neck of the detent head that fits in the circular recess 2e, pass through the mounting hole 2d that opens at the bottom of the non-circular recess. The saw blade 1 has a holding shaft neck 15b that can be fitted with the tail end round hole 1a of the saw blade, and a step shaft neck 15c having a smaller diameter than this, and the saw blade 1 has a round hole 1a at its tail end around it. A notch 1b that opens toward the edge of the tail end with a minimum inner width corresponding to the outside diameter of the stepped shaft neck, and a notch 1c, 1d that forms a pair with the edge of the tail end that is separated from this incision. In addition, the spring case 8 has a protrusion 8f for locking the slit 1b of the saw replacement blade on the upper surface 8c facing the other half 2b of the two mating shells with the saw replacement blade interposed therebetween. 2m, 2 incisions at the saw blade replacement and storage position
Springs 17 that engage each of the n pairs to hook the saw blade
Secure the winding tightness of the spiral spring 9 that biases the saw blade from the retracted position to the deployed position under the engagement between the tumbler knob 5 of the device and one of the cuts 1c and 1d formed by the tumbler knob. A flip-up folding fold saw that has a stopper 2g for hooking a spring case and is easy to attach and detach a saw blade.