Locking mechanism for folding chassis of electric cutting machine

Abstract

A locking mechanism for a folding chassis of an electric cutting machine. The chassis (1) comprises: a main arm (10), a support seat (11), an oblique arm (12) and an end arm (13), wherein the end arm (13) is provided with wheels (14), and the support seat (11), the oblique arm (12) and the end arm (13) can all be folded relative to the main arm (10) between a folded position and an unfolded position of the chassis. The locking mechanism (2) is mounted on the oblique arm (12) and comprises: a manually rotatable locking clip (21) which rotates between a working position for locking the chassis (1) and a non-working position for unlocking the chassis (1), and is connected to a locking rod (112, 113) in the working position; a manually movable trigger (22) for keeping the locking clip (21) in the working position or the free position; and an elastic element which tends to move the locking clip (21) and the trigger (22) to a position for unlocking the chassis (1).

Description

Technical Field

[0001] The invention is suitable for use in an industry that specializes in manufacturing folding chassis for electric cutting machines. Background Art

[0002] Currently, known electric cutters have a folding chassis to facilitate their transportation and use in different working areas.

[0003] The folding chassis generally has a main support arm that supports the cutter and folding legs by means of a frame. The chassis includes the folding legs and can lock the folding legs in a folded position and an unfolded position.

[0004] The locking function is achieved by a set screw, which must be tightened or loosened each time the chassis is folded or unfolded. This locking method has several disadvantages, including: the risk of losing the set screw; the need to use a tool to achieve proper tightening of the set screw; and the time required to tighten or loosen the set screw each time the electric cutting machine support chassis is folded or unfolded.

[0005] Therefore, it is necessary to develop a locking mechanism that can overcome the above-mentioned shortcomings. Summary of the invention

[0006] The locking mechanism of the present invention has technical features that can solve the above-mentioned disadvantages. The operation of the locking mechanism is quick and simple. The chassis can be locked in either the folded or unfolded position by manually moving a single part, and the chassis can be unlocked by manually activating another part.

[0007] According to the present invention, the locking mechanism is suitable for a folding chassis of an electric cutting machine, the folding chassis comprising a main arm, a support base and an oblique arm, the support base and the oblique arm are foldable relative to the main arm, and the support base and the oblique arm are interconnected through an end arm, the end arm is provided with wheels, and during the folding and unfolding process of the chassis, the end arm is folded together with the support base and the oblique arm.

[0008] The locking mechanism is mounted on an oblique arm of the chassis and comprises:

[0009] - a locking clip mounted on the oblique arm and rotatable between: an operative position for locking the chassis in the folded position or the unfolded position, and an inoperative position for unlocking the chassis; the locking clip comprising: a rear recess for accommodating a first locking rod of the chassis when the chassis is in the unfolded position, the first locking rod being fixed to the end arm; and a front recess for accommodating a second locking rod of the chassis when the chassis is in the folded position, the second locking rod being fixed to the upper region of the support seat;

[0010] - a trigger movable between: a position holding the locking clip in the operative position to lock the chassis, and a free position enabling the locking clip to be moved towards the inoperative position;

[0011] - an elastic element tending to move said locking clip towards said inoperative position and said trigger towards said free position in order to unlock said chassis.

[0012] According to the present invention, the trigger includes an attachment facing the locking clip, and when the locking clip is in the working position locked to the chassis, the attachment acts on a stopper of the locking clip to keep the locking clip in the working position; when the trigger is manually moved to the free position, the locking clip returns to the non-working position under the action of the elastic element.

[0013] In order to lock the chassis in the folded position or the unfolded position, it is only necessary to face the rear groove towards the first locking rod, or the front groove towards the second locking rod, and manually push the locking clip toward the working position to overcome the resistance of the elastic element until the rear groove or the front groove is connected to the corresponding locking rod.

[0014] This operation automatically moves the displaceable trigger to the position that holds the locking clip in the working position, through the action of the elastic element.

[0015] In order to unlock the chassis in either the folded or unfolded position, the trigger is manually moved toward the free position to overcome the resistance of the elastic element, so that the locking clip automatically returns to the inoperative position through the action of the elastic element.

[0016] The locking mechanism described significantly simplifies operation, its operation being completely manual and very intuitive, achieving the stated objectives.

[0017] The features of the present invention will be more easily understood based on the exemplary embodiments shown in the following figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] As a supplement to the description provided herein, and in order to help make the features of the invention more easily understood, this specification is accompanied by a set of drawings which represent the following by way of illustration and not limitation:

[0019] Figure 1 A perspective view of a folding chassis of an electric cutting machine in an unfolded position, the folding chassis being provided with a locking mechanism.

[0020] Figure 2 It is a front view of the chassis secured in the deployed position by the locking mechanism.

[0021] Figure 3 for Figure 2 An enlarged detail of the embodiment of the invention in which the locking mechanism can be seen in the working position.

[0022] Figure 4 This is a front detail view of the operation process of the locking mechanism entering the working position when the chassis is in the deployed position.

[0023] Figure 5 An enlarged detail view of the operation process of the locking mechanism entering the inoperative position to unlock the folding chassis.

[0024] Figure 6 It is a front view of the chassis secured in the folded position by the locking mechanism.

[0025] Figure 7 for Figure 6 An enlarged detail of the embodiment of the invention, in which the locking mechanism can be observed in the same working position.

[0026] Figure 8 Enlarged detail of the chassis before the locking mechanism secures it in the folded position.

[0027] Fig. 9 An enlarged detail view of the operation of the locking mechanism into the inoperative position to unlock the chassis. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, the folding chassis (1) of the electric cutting machine comprises: a main arm (10), the first end of which has an inclined extension (101) for grasping; a support base (11), which is fixed to the first end of the main arm (10) through a rotating shaft (111); an inclined arm (12), which is fixed to the second end of the main arm (10) through a corresponding rotating shaft (121); and an end arm (13), which is provided with wheels (14) and is installed in the middle area between the support base (11) and the inclined arm (12) through the respective rotating shafts (131, 132) of the support base (11) and the inclined arm (12).

[0029] Through the above structure, the chassis (1) can be moved to Figure 1 The end arm (13) is almost aligned with the oblique arm (12); the chassis (1) can also be extended to the position shown in FIG. Figure 7 The position shown is folded, wherein the end arm (13) is folded towards the free end of the support seat (11).

[0030] The locking mechanism (2) is used to fix the chassis (1) in a folded position and an unfolded position. The locking mechanism (2) is installed on the oblique arm (12), specifically located in an area close to the free end of the oblique arm (12), that is, located in an area close to the other end of the oblique arm (12) opposite to the end where the main arm (10) is hinged.

[0031] The locking mechanism (2) comprises a locking clamp (21), a trigger (22) and an elastic element (23); the locking clamp (21) and the trigger (22) are mounted on the oblique arm (12) via respective rotating shafts (211, 221); the elastic element (23) works by pressure, and its two ends are respectively fixed on the locking clamp (21) and the trigger (22).

[0032] The locking clamp (21) is used to interact with a first locking rod (133) fixed on the end arm (13) and a second locking rod (112) fixed on the upper area of ​​the support base (11) to lock the chassis (1) so that the chassis (1) is fixed in a position such as Figure 2 and Figure 3 in the extended position shown, or fixed in Figure 6 and Figure 7 Folded position shown.

[0033] The locking clip (21) can be moved relative to the rotating shaft (221). Figure 3 The working position shown is similar to Figure 4 The chassis (1) is shown unlocked for rotation between non-operating positions.

[0034] The locking clip (21) comprises a rear groove (212) and a front groove (213). The rear groove (212) is used to accommodate the first locking rod (133) when the chassis (1) is in the unfolded position. Figure 6 The front groove (213) is used to accommodate the second locking rod (112) when the chassis (1) is in the folded position, as shown Figure 7 shown.

[0035] like Figure 3 As shown, the rear groove (212) and the front groove (213) of the locking clip (21) are respectively arranged below and above the oblique arm (12), so that the elastic element (23) always tends to keep the locking clip (21) in a non-working position relative to the locking rod (112, 133).

[0036] The trigger (22) is capable of rotating relative to the rotation axis (221) between the following positions: a position in which the locking clip (21) is held in a working position for locking the chassis (1), and a position in which the locking clip (21) is held in a working position for locking the chassis (1). Figure 3 as shown; and a free position, as Figure 4 As shown, in this free position, the locking clip (21) can move to an unlocked non-operating position.

[0037] from Figure 3 and Figure 4It can be observed that the trigger (22) includes an accessory (222), which is used to abut against a stopper (214) of the locking clip (21) when the locking mechanism (2) is in the working position for locking the chassis (1), so as to prevent the elastic element (23) from moving the locking clip (21) to the non-working position and thereby unlocking the chassis (1).

[0038] from Figure 4 It can be seen that in order to lock the chassis (1) in the unfolded position, it is necessary to unfold the chassis (1) and then manually rotate the locking clip (21) in the "a" direction so that the rear groove (212) is engaged by the first locking rod (133) of the end arm (13) and reaches the position as shown in FIG. Figure 3 Working position shown.

[0039] When the locking clip (21) is manually rotated, the trigger (22) rotates in the same direction under the action of the elastic element (23), so that its attachment (222) abuts against the stopper (214) of the locking clip (21), thereby keeping the locking clip (21) in the working position and preventing the elastic element (23) from turning the locking clip (21) to the non-working position.

[0040] In the above Figure 4 In the embodiment, the locking clip (21) and the trigger (22) respectively include a pin (215) and a pin (223), and the pin (215) and the pin (223) are used to contact the inclined arm (12) in the non-working position of the locking mechanism (2) to form a structure to prevent rotation.

[0041] like Figure 5 As shown, to Figure 3 To unlock the chassis (1) in the deployed position shown, the trigger (22) is manually rotated in the "b" direction to overcome the traction of the elastic element (23), so that the attachment (222) is located below the stop (214) of the locking clip (21), and the locking clip (21) is rotated in the same direction so that the rear groove (212) is disengaged from the first locking rod (133).

[0042] Figure 6 The chassis (1) is shown locked in a folded position, with the locking mechanism (2) acting on a second locking rod (112) fixed to the upper end of the support seat (11).

[0043] exist Figure 7 In the embodiment, the locking mechanism (2) is in contact with Figure 3 The same working position is shown, only in this case the front groove (213) of the locking clip (21) is engaged by the second locking rod (112).

[0044] Furthermore, as in the previous case, the chassis (1) is locked in the folded position, such as Figure 8 As shown, it is only necessary to manually rotate the locking clip (21) in the direction "a" so that the front groove (213) surrounds the second locking rod (112) until it reaches Figure 7 The trigger (22) and its attachment (222) are also rotated in the same direction under the action of the elastic element (23), thereby keeping the locking clip (21) in the locked working position.

[0045] like Fig. 9 As shown, as in the above-mentioned case, to unlock the locking mechanism (2), it is only necessary to manually rotate the trigger (22) in the "b" direction, so that the attachment (222) is located below the stopper (214) of the locking clip (21), so that the locking clip (21) can be rotated toward the non-working position under the action of the elastic element (23), and the front groove (213) is disengaged from the second locking rod (112).

[0046] Having fully described the nature of the present invention, except for the preferred exemplary embodiments, it is hereby stated for related purposes that the materials, shapes, sizes and arrangements of the elements described may be modified as long as it does not mean changing the basic characteristics of the claimed invention.

Claims

1. A locking mechanism for a folding chassis of an electric cutting machine, the folding chassis (1) comprising a supporting main arm (10), a supporting seat (11) and an oblique arm (12), the supporting seat (11) and the oblique arm (12) being foldable relative to the main arm (10), the supporting seat (11) and the oblique arm (12) being interconnected via an end arm (13), the end arm (13) being provided with wheels (14), and during the folding and unfolding process of the chassis (1), the end arm (13) is folded together with the supporting seat (11) and the oblique arm (12); wherein: The locking mechanism comprises: - a locking clip (21) mounted on the oblique arm (12) and rotatable between the following positions: an operating position for locking the chassis (1) in a folded position or an unfolded position, and a non-operating position for unlocking the chassis (1); the locking clip (21) comprising: a rear groove (212) for connecting a first locking rod (133) of the chassis (1) when the chassis (1) is in the unfolded position, the first locking rod (133) being fixed to the end arm (13); Characterized in that the locking clip (21) further comprises: - a front groove (213) for connecting a second locking rod (112) of the chassis (1) when the chassis (1) is in the folded position, the second locking rod (112) being fixed to the upper area of ​​the support seat (11); And the locking mechanism also includes: - a trigger (22) movable between: a position holding the locking clip (21) in the operative position to lock the chassis (1), and a free position enabling the locking clip (21) to be moved towards the inoperative position; and - an elastic element tending to move the locking clip (21) towards the inoperative position and the trigger (22) towards the free position in order to unlock the chassis (1); The trigger (22) comprises an accessory (222), and when the locking clip (21) is in the working position of locking the chassis (1), the accessory (222) acts on a stopper (214) of the locking clip (21) to keep the locking clip (21) in the working position; when the trigger (22) is manually moved to the free position, the locking clip (21) returns to the non-working position under the action of the elastic element (23); The rear groove (212) and the front groove (213) of the locking clip (21) are respectively arranged below and above the oblique arm (12), so that the elastic element (23) always tends to keep the locking clip (21) in an unlocked non-working position relative to the first locking rod (133) and the second locking rod (112).

2. The locking mechanism according to claim 1, characterized in that: The locking clip (21) and the trigger (22) are respectively mounted on the oblique arm (12) via respective first rotating shafts (211) and second rotating shafts (221).

3. The locking mechanism according to claim 1 or 2, characterized in that: The elastic element (23) acts through a pulling force, and its two ends are respectively fixed on the locking clip (21) and the trigger (22).

4. The locking mechanism according to any one of claims 1 or 2, characterized in that: The locking clip (21) and the trigger (22) respectively comprise a first pin (215) and a second pin (223), wherein the first pin (215) and the second pin (223) are used to contact the oblique arm (12) in a non-working position of the locking mechanism to form a structure to prevent rotation.

5. The locking mechanism according to claim 4, characterized in that: The first end of the main arm (10) has an inclined extension (101) for grasping.

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