CN201286503Y

CN201286503Y - Step-ladder locking mechanism

Info

Publication number: CN201286503Y
Application number: CNU2008201462563U
Authority: CN
Inventors: 冷鹭浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-06
Filing date: 2008-11-06
Publication date: 2009-08-12
Anticipated expiration: 2018-11-06

Abstract

The utility model discloses an interlock mechanism for a step stool. The step stool comprises a front leg tube, a back leg tube, a top pedal and the interlock mechanism, wherein, a rotational connection structure is formed between the front leg tube and the back tube; the front part of the top pedal is rotationally connected with the front leg tube; a cross rod is fixedly arranged on the back leg tube; and the interlock mechanism which is arranged on the top pedal and connected with the cross rod in an assembly and disassembly manner comprises two engaging lugs, a rotating shaft, a lock catch and a torsion spring, wherein, the two engaging lugs are arranged on the top pedal and protrudes the bottom surface of the top pedal; the left two engaging lugs and the right two engaging lugs are in parallel arrayed at intervals; the rotating shaft can rotationally penetrate the two engaging lugs; the lock catch is fixedly connected with the rotating shaft and provided with a hook joint rabbet which can hook the cross rod from external to internal; and the torsion spring is sleeved on the rotating shaft, the two ends of the torsion spring hold upwards the pedal and the lock catch respectively, and the torsion spring generates a torque which can drive the rotating shaft to rotate. The interlock mechanism which adopts the structure that the hook joint rabbet hooks the cross rod has the advantage that a user can realize the function of the releasing of the lock joint and the function of the rotating of the top pedal. simultaneously only by holding and lifting upwards the lock.

Description

A kind of step stool latching device

Technical field

The utility model relates to a kind of step stool latching device.

Background technology

The Chinese patent data have been announced the utility model of invention and created name for " the snap close structure of step stool " on April 18th, 2007, and its notification number is CN2889017Y.A kind of snap close of step stool structure comprises the hanger bulk that is journaled on first flap and can rotates around this pivot point, wherein: be provided with on the hanger bulk and hold the conduit that the protruding bolt that installs on second flap enters; One spring is packed on the hanger bulk; One locking hook becomes to relatively rotate attitude pivot dress by the pivot piece installing with hanger bulk; One end of described locking hook is connected with the free end of spring on being packed in hanger bulk; This locking hitcher has the hook notch of the protruding bolt that can embrace on second flap.The pine oil process of this snap close comprises: 1, rotate the locking hook earlier, make the locking hook away from protruding bolt; 2, follow the rotational hook body, make hanger bulk away from protruding bolt; 3, relatively rotate first flap and second flap then, drive front leg tube and back leg pipe and fold.By foregoing description as can be known: this pine oil process comprises a plurality of steps, and the pine oil complexity is used inconvenience.

The utility model content

The utility model provides a kind of step stool latching device, and it has overcome the existing pine oil complexity of step stool latching device of background technology, awkward deficiency.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of step stool latching device, this step stool comprises front leg tube, back leg pipe, top pedal and latching device, constitute rotation connection structure between this front leg tube and the back leg pipe, this pedal front portion, top front leg tube that is rotationally connected, be installed with a cross bar on this back leg pipe, this latching device is located at the top pedal and can installs and removes and connects cross bar, and this latching device comprises:

Two engaging lugs, they are located at the top pedal and protrude out the bottom surface of top pedal, and this two engaging lug is between left and right every side by side;

One turning cylinder, it can rotate and pass two engaging lugs;

One snap close, its affixed turning cylinder and have one can be from outer clasp joint notch toward interior clasp joint cross bar; And

One torsion spring, its socket turning cylinder and two ends are contact pedal and snap close respectively, and generation has the moment of torsion that can drive the turning cylinder rotation.

In the preferred embodiment of the present utility model, this top pedal comprises that one can abut against carriage and on the cross bar and is installed in panel on the carriage; This engaging lug is located at panel and protrudes out the bottom surface of panel, and this carriage surrounds turning cylinder, torsion spring and snap close.

In the preferred embodiment of the present utility model, the bottom surface of this panel convexes with a limited block that can limit snap close maximum rotation angle, and this limited block is between two engaging lugs; Distance between this snap close upper end and the turning cylinder axis is greater than the distance between limited block end and the turning cylinder axis.

In the preferred embodiment of the present utility model, offer on this panel two between left and right every side by side, run through through hole up and down; Other is equipped with affixed two engaging lugs of an intermediate plate, the supreme bottom surface of down passing through hole and protruding out panel of this engaging lug, and this intermediate plate abuts against the end face of panel.

In the preferred embodiment of the present utility model, this snap close has a matrix, convexes with two on this matrix between left and right every side by side lug, and this lug top convexes with a lug that can be abutted against limited block, the affixed turning cylinder of this two lug.

In the preferred embodiment of the present utility model, be formed with an abutment face between this two lug; One end of this torsion spring is resisted against the bottom surface of panel, and the other end is resisted against abutment face.

In the preferred embodiment of the present utility model, this snap close has a matrix, is provided with the handshake part under this matrix, and side within the matrix is stretched out in this handshake part, cooperates between this handshake part and the matrix to form the clasp joint notch.

In the preferred embodiment of the present utility model, this surface, handshake part is provided with hand and grabs groove.

The technical program is compared with background technology: this latching device adopts the clasp joint notch clasp joint cross bar of snap close, therefore the user if hand grab snap close and upwards mention the function that can realize pine oil interlocking function simultaneously and rotate top pedal, folding step stool, easy to use fast.Owing to be provided with torsion spring, therefore can realize the automatic locking connection function, the security performance height.Because latching device mainly is positioned at the panel below, does not therefore take up space, and can not destroy the associative perception of top pedal, appearance looks elegant.Because the two ends of torsion spring are resisted against abutment face and panel respectively, therefore can guarantee that snap close is subjected to clockwise moment of torsion, guarantee that snap close is firm, the security performance height.Because the surface, handshake part is provided with hand and grabs groove, so hold during pine oil comfortablely, be convenient to firmly.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 has illustrated one of the schematic perspective view of the step stool of a preferred embodiment.

Fig. 2 illustrated a preferred embodiment step stool schematic perspective view two.

Fig. 3 has illustrated the perspective exploded view of the latching device of a preferred embodiment.

Fig. 4 has illustrated the generalized section of snap close first step of the latching device of a preferred embodiment.

Fig. 5 has illustrated the generalized section of snap close second step of the latching device of a preferred embodiment.

Fig. 6 has illustrated the generalized section of snap close third step of the latching device of a preferred embodiment.

Fig. 7 has illustrated the generalized section of snap close the 4th step of the latching device of a preferred embodiment.

The latching device that Fig. 8 has illustrated a preferred embodiment is in the generalized section of snap close state.

The specific embodiment

Please refer to Fig. 1 and Fig. 2, this step stool comprises that two front leg tubes 100, a U-shaped pipe 200, two back leg pipes 300, a top pedal 400, are installed in a bottom pedal 500 and a latching device 600 between two front leg tubes 100.

These U-shaped pipe 200 ends are fixedly connected on front leg tube 100 tops by pin joint seat 110, and these back leg pipe 300 tops are rotatably connected on pin joint seat 110, so constitute between front leg tube 100 and the back leg pipe 300 and be rotationally connected.Be set with a cross bar 310 between this two back legs pipe 300.

Please refer to Fig. 1, Fig. 2 and Fig. 3, this top pedal 400 forms (or by the moulding of moulding integrated through injection molding) by ironware or thin aluminum sheet integrated punching, and it comprises that a rectangle carriage 410 and is installed in the panel 420 on the carriage 410.These carriage 410 front portions are rotatably connected between two front leg tubes 100, other is equipped with a pin-jointing piece 510, and its front end is rotatably connected among the carriage 410, and the rear end is rotatably connected on back leg pipe 300, this syndeton is a prior art, is not further described at this in order to save space.Offer on this panel 420 two between left and right every side by side, run through through hole 421 up and down, the bottom surface convexes with a limited block 422 that is positioned between two through holes 421 (two engaging lugs 610).

This latching device 600 is located at top pedal 400 and can installs and removes and connects cross bar 310, and it comprises two engaging lugs 610, an intermediate plate 620, a turning cylinder 630, a snap close 640 and a torsion spring 650.

These intermediate plate 620 affixed two engaging lugs 610, and make two engaging lugs 610 between left and right every side by side.These engaging lug 610 supreme bottom surfaces of down passing through hole 421 and protruding out panel 420.This intermediate plate 620 abuts against the end face of panel 420, and makes: constitute fixedly connected between this intermediate plate 620, two engaging lugs 610 and the panel 420.

This turning cylinder 630 can rotate and pass two engaging lugs 610.

This snap close 640 has a matrix.Convex with two abutment faces 642 that are located at the inclination between two lugs 641 between left and right every lug 641 and side by side on this matrix, these lug 641 tops convex with a lug 643.These two lugs, 641 affixed turning cylinders 630 make snap close 640 can follow turning cylinder 630 and rotate.Distance between these lug 643 ends and turning cylinder 630 axis is greater than the distance between limited block 422 ends and turning cylinder 630 axis, therefore this limited block 422 can play restriction snap close 640 maximum rotation angles, it is excessive to prevent that snap close 640 from rotating, prevent that torsion spring 650 distortion are excessive, prevent that torsion spring 650 from damaging, reduction of service life.Be provided with handshake part 644 under this matrix, side within the matrix is stretched out in this handshake part 644, so cooperates formation clasp joint notch 645 between handshake part 644 and the matrix medial surface.These 644 surfaces, handshake part are provided with hand and grab groove.

These torsion spring 650 socket turning cylinders 630, and have two abutment end.This first abutment end is resisted against the bottom surface of panel 420, and second abutment end is resisted against the abutment face 642 of snap close 640, makes snap close 640 be subjected to clockwise moment of torsion.

Please refer to Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, they have illustrated snap close interlocking procedural order, and this snap close process comprises:

1, launch front leg tube 100 and back leg pipe 300, this top pedal 400 clockwise rotates, as shown in Figure 4 and Figure 5;

2, continue to launch front leg tube 100 and back leg pipe 300, perhaps, clockwise rotate top pedal 400, abut against cross bar 310 up to the inner of the handshake part 644 of this snap close 640, as shown in Figure 6 and Figure 7;

3, continue to launch front leg tube 100 and back leg pipe 300, perhaps, clockwise rotate top pedal 400; These clasp joint notch 645 the inners are abutted against, along with cross bar 310 to lower slider (overcoming torsion spring distortion elastic force); When sliding into a certain position, under the torsion spring torsional interaction, snap close clockwise rotates, and at this moment, this carriage 410 is supported on cross bar 310 to this clasp joint notch 645 toward interior clasp joint cross bar 310 from outer, and this latching device 600 is in the interlocking state, as shown in Figure 8.

The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented with this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.

Claims

1. step stool latching device, this step stool comprises front leg tube, back leg pipe, top pedal and latching device, constitute rotation connection structure between this front leg tube and the back leg pipe, this pedal front portion, top front leg tube that is rotationally connected, be installed with a cross bar on this back leg pipe, this latching device is located at the top pedal and can installs and removes and connects cross bar, and it is characterized in that: this latching device comprises:

One turning cylinder, it can rotate and pass two engaging lugs;

2. a kind of step stool latching device according to claim 1 is characterized in that: this top pedal comprises that one can abut against carriage and on the cross bar and is installed in panel on the carriage; This engaging lug is located at panel and protrudes out the bottom surface of panel, and this carriage surrounds turning cylinder, torsion spring and snap close.

3. a kind of step stool latching device according to claim 2 is characterized in that: the bottom surface of this panel convexes with a limited block that can limit snap close maximum rotation angle, and this limited block is between two engaging lugs; Distance between this snap close upper end and the turning cylinder axis is greater than the distance between limited block end and the turning cylinder axis.

4. a kind of step stool latching device according to claim 3 is characterized in that: offer on this panel two between left and right every side by side, run through through hole up and down; Other is equipped with affixed two engaging lugs of an intermediate plate, the supreme bottom surface of down passing through hole and protruding out panel of this engaging lug, and this intermediate plate abuts against the end face of panel.

5. a kind of step stool latching device according to claim 3, it is characterized in that: this snap close has a matrix, convex with two on this matrix between left and right every side by side lug, this lug top convexes with a lug that can be abutted against limited block, the affixed turning cylinder of this two lug.

6. a kind of step stool latching device according to claim 5 is characterized in that: be formed with an abutment face between this two lug; One end of this torsion spring is resisted against the bottom surface of panel, and the other end is resisted against abutment face.

7. a kind of step stool latching device according to claim 3, it is characterized in that: this snap close has a matrix, is provided with the handshake part under this matrix, and side within the matrix is stretched out in this handshake part, cooperates between this handshake part and the matrix to form the clasp joint notch.

8. a kind of step stool latching device according to claim 7 is characterized in that: this surface, handshake part is provided with hand and grabs groove.