CN2502575Y

CN2502575Y - Self-locking device for step of step-stool

Info

Publication number: CN2502575Y
Application number: CN 01262254
Authority: CN
Inventors: 冷鹭浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-10-18
Filing date: 2001-10-18
Publication date: 2002-07-31
Anticipated expiration: 2011-10-18

Abstract

The utility model discloses a self-locking device of a footrest board of a step stool, comprising a tongue article, a button, a spring and a connection plate. The footrest board is riveted with the connection plate to form a rotary hinge through rivets; the tongue article is fixed at the back of the footrest board; the spring is sleeved a pin shaft where a rotary point of the footrest board is located and the pin shaft is also sleeved with the tongue article and hangs the spring on the tongue plate which is provided with a pad pressing and locked through screws on the tongue plate; the connection plane between the connection plate and the tongue plate is smooth in one direction. When the step stool is opened, the connection plate rotates around the rivets; when the connection plate rotates to a location 20 degrees with the level, the part of the tongue plate, which stretches out the footrest board starts to slide along a projected slope of the connection plate and the tongue plate automatically rotate clockwise and the spring is pressed; when the connection plate rotates to the level, the tongue plate flicks out automatically and is locked with the connection plate. When the step stool being folded, the button is first pressed and the tongue plate is released so as to fold the step stool.

Description

A kind of self-locking device of step stool pedal

Technical field: the utility model relates to a kind of self-locking device of step stool.

Technical background: ladder is the instrument that is used to ascend a height, traditional ladder structure is very simple, by two support bars, and horizontal treadle is formed, need be against on a certain bracing frame and use, improved step stool is the stool structure of multilayer, uses stable, safety, as folding step stool then is that step stool is designed to foldable mechanism, existing folding characteristics can be turned up when not using, and take up space less, has best effect performance, but step stool is for ascend operation after all, and safety is most important aloft, therefore, prevent to fold step stool and turn up when the people climbs, meeting accident is the safety-critical of this product.

Summary of the invention: self-locking device of the present utility model comprises tongue piece, button, spring, brace, pedal is riveted into a rotatable hinge by rivet and brace, tongue piece is fixed on the pedal back, spring housing is on the bearing pin at pedal point of rotation place, on bearing pin, overlap upper tongue again, and spring is hung on the tongue piece, press pad on the tongue piece, by the screw locking, it is level and smooth that the contact-making surface of brace and tongue piece has on the direction.

When step stool in opening procedure, brace rotates around rivet, when brace turns to when becoming the 20 degree left and right sides with level, the part that tongue piece stretches out pedal begins to slide along the inclined-plane of brace projection, tongue piece clockwise rotates automatically, spring is compressed; When brace turned to horizontal level, tongue piece ejected automatically, blocked brace.When folding step stool, at first press the button, tongue piece is thrown off, and step stool can fold.

The utility model has increased by a self-locking device, with the brace location, has avoided hinge to be rotated further, the step stool unsure state.

Description of drawings: Fig. 1 a.b is the opening of the utility model step stool, folded state diagram; Fig. 2 is the utility model self-locking device schematic diagram; Fig. 3 is the utility model self-locking device work schematic diagram; Fig. 4 a.b.c is the brace three-view diagram; Fig. 5 a.b is for the tongue piece master looks, upward view.

The specific embodiment: the utility model tongue piece as shown in Figure 5, tongue piece 5 has two work retaining points 5.2,5.3, retaining point 5.2 can offset with spring 4, retaining point 5.3 and button 3 offset, tongue piece front end 5.4 stretches out pedal, and tongue piece 5 is enclosed within on the bearing pin by centre bore 5.1, and is fixed by nut.

Brace is as shown in Figure 4: brace 2 has two fixing holes 2.1, can be respectively by rivet to pedal 6 and back leg 1, a smooth ramp 2.2 is arranged on the brace side, it smoothly touches mutually with tongue piece in a direction, and tongue piece is compressed into.

Foreleg 7 back legs 1 are folded up state shown in Fig. 1 b.

Claims

1, a kind of self-locking device of step stool pedal, it is characterized in that it comprises tongue piece, button, spring, brace, pedal is riveted into a rotatable hinge by rivet and brace, tongue piece is fixed on the pedal back, and spring housing overlaps upper tongue again on bearing pin on the bearing pin at pedal point of rotation place, and spring is hung on the tongue piece, press pad on the tongue piece, by the screw locking, it is level and smooth that the contact-making surface of brace and tongue piece has on the direction.