TWM573372U - Step ladder platform with retractable rear foot-wheel device - Google Patents

Abstract

A step ladder platform with retractable rear foot-wheel device which is disposed at inner sides of two opposite lower frames of the platform next to rear ends thereof respectively; the rear foot-wheel device comprises an outer square pipe, an inner square pipe, a knob bolt and a rear foot-wheel; a lateral side of the outer square pipe is attached to the inner side of the respective lower frame next to the rear end thereof in a slanting way; an opposite lateral side of the outer square pipe to the preceding lateral side is disposed a reinforced block at an end thereof with a threaded hole therein; the knob bolt engages with the threaded hole; an end of the inner square pipe slides into the outer square pipe and another end thereof extends outward a supporting elongated plate is attached to a lateral side of the inner square pipe with a rivet; a threaded hole is disposed at the lateral side of inner square pipe next to the rivet corresponding to the threaded hole at the outer square pipe; the rear foot-wheel is joined to the elongated plate with a pivot; when the inner square pipe slides outward from the outer square pipe till the rear foot-wheel touching the ground, the step ladder platform can be moved with the rear foot-wheel device; when the inner square pipe is pushed back, the rear foot-wheel device is in a state of being hidden and not in use.

Description

Stepped step with retractable rear caster

The present invention relates to a stepped stepper having a retractable rear caster device, and more particularly to a device that can be extended and retracted by a rear caster disposed under the stepped foot of the stepped step.

The stepped stepper is one of the commonly used climbing tools for users because of its large pedal area, which is convenient for the user to climb and stand up stably and safely. However, since the general stepped step is large in size, it is not easy to move it by a single person, and thus the mobility is poor. At present, there is a stepped treadmill on the market with casters fixed under the four corners for easy movement; but the user stands on the four-legged stepped treadmill, which is easy to shake and causes the center of gravity to be unstable or even fall. Danger. There is also a stepped step on the two rear feet, a pair of casters extending backwards are fixed, and the casters are used to move the step; but because of the distance between the casters and the steps extending backward, the steps are close to the wall or Working places such as machines and machines cause restrictions on the work of users.

The main purpose of the creation of the "stepped stepper with retractable rear caster device" is to improve the lack of the above-mentioned conventional stepped treadmill and to provide the user with the stepping table and the foot end must be as close as possible to the working position, the rear caster can be inside Shrinking will not cause obstacles to work; when the step is moved, the rear caster device can be extended to facilitate easy pulling by the user.

In order to achieve the above object, the present invention "a stepped step provided with a retractable rear caster device" has two chassis opposite to each other and a rear caster device respectively fixed to the inner rear end of the two chassis; wherein the rear caster The device comprises an outer square tube having a side surface that is veneered and fixed obliquely to the rear end of the inner side of each of the chassis, one other side opposite the side and one fixed to the other side a reinforcing block having a screw hole at one end thereof, the screw hole penetrating the other side; a knob bolt is screwed into the screw hole; an inner tube has one end extending into the outer tube so that the inner tube can slide therein The other end extends a support long plate along one side thereof, and the support long plate is fixed to the side by a pull pin, and the side edge is provided with a screw hole corresponding to the screw hole of the outer tube near the pull pin. A rear caster is rotatably fixed to the support long plate by a pivot; when the rear caster device is to be used to move the step, the knob bolt is first loosened, and the inner tube is slid out from the outer tube until the rear caster Touch the ground, then tighten the knob bolt to the side of the inner tube When the rear caster device is not used to move the step, first loosen the knob bolt and push the other end of the inner tube to the outer square tube until the screw hole of the inner tube is aligned with the screw hole of the outer tube, and then turn the knob bolt The screw hole of the inner square tube is such that the rear caster does not contact the ground and is hidden at the back foot of the step.

1‧‧‧ rear caster device

11‧‧‧External management

111‧‧‧ reinforcing block

1111‧‧‧ screw hole

12‧‧‧ inner tube

121‧‧‧Support long board

1211‧‧‧Axis hole

122‧‧‧ Pull pins

123‧‧‧ screw hole

13‧‧‧ rear casters

131‧‧·round hole

14‧‧‧Bolt-shaped pivot

141‧‧‧ nuts

15‧‧‧ knob bolt

2‧‧‧step ladder

21‧‧‧ Chassis

Figure 1 is a perspective view showing the creation of a "stepped stepper with a retractable rear caster device".

Fig. 2 is an exploded perspective view showing the rear caster device on the left side of the creation "stepped step provided with a retractable rear caster device" shown in Fig. 1.

Fig. 3 is a perspective enlarged view showing the rear caster device of the right side in the "stepped step with a retractable rear caster device" shown in Fig. 1, in which the step only partially shows the right rear leg portion of the step.

Fig. 4 is a perspective enlarged view showing the rear caster device of the right side in the "stepped step with a retractable rear caster device" shown in Fig. 1 in which the right rear leg portion is partially displayed.

Fig. 5 is a side elevational view showing the "stepped stepping platform provided with the retractable rear caster device" shown in Fig. 1 by the rear caster device being pulled by the user.

Referring to FIG. 1 and FIG. 2, the "stepped stepping table with a retractable rear caster device" is basically a stepped step 2 as shown in FIG. 1, and the two sides of the bottom are opposite base frames 21, 21; each of the chassis 21 is located near the inner side of the rear end thereof, and a retractable rear caster device 1 is fixed. The retractable rear caster device 1, as shown in FIG. 2, basically comprises an outer square tube 11, an inner square tube 12 and a rear caster 13; the outer tube 11 has a first side and a first side An opposite second side, the first side surface is veneered and fixed obliquely to the vicinity of the rear side of the inner side of the corresponding chassis 21, and one end of the second side is provided with a reinforcing block 111; A screw hole 1111 is disposed in the reinforcing block 111 and extends through the second side, so that a knob bolt 15 can be screwed into the screw hole 1111; as shown in FIG. 1, the outer tube 11 is a conventional chassis 21 The rear end is fixed in a downwardly inclined state; the inner tube 12 has the same length as the outer tube 11, and the outer peripheral dimension of the cross section is the same as the inner diameter of the outer tube 11 section. Therefore, the inner tube 12 is One end extends into the outer tube 11, and the other end is slidable in the inner hole of the outer tube 11 in the case of the outer tube 11. The inner tube 12 is fixed at the outer end of the outer tube 11 with a support long plate extending outward. 121, for connecting the rear caster 13, wherein the support long plate 121 is fastened to the inner surface of one side of the inner square tube 12 and the support long plate 121 is fixed by a pull pin 122 to The inner tube 12; the support long plate 121 is provided near the outer end thereof with a shaft hole 1211 for extending a bolt-shaped pivot 14 through the shaft hole 1211 and the rear caster 13 wheel center hole 131 by a nut 141 Screwing the pivot 14 so that the rear caster 13 can rotate The screw hole 123 corresponding to the screw hole 1111 of the outer tube 11 is also disposed adjacent to the pull pin 122 of the inner tube 12 for screwing the knob bolt 112 into the screw hole 123.

Referring to Figures 3 and 4 and in conjunction with the illustrations of Figures 1 and 2, the operation of the rear caster device 1 of the present invention will be further described below. 3, in the case where the inner tube 12 is held in the outer tube 11 at one end thereof, the outer tube 11 is slid out so that the rear caster 13 contacts the ground; the inner tube 12 slides out from the outer tube 11 In order to keep the inner tube 12 in a state of being slid out, without shrinking, the knob bolt 15 is rotated in the direction of rotation until the surface of one side of the inner tube 12 is abutted, and the weight of the rear caster 13 itself is also helpful. The inner tube 12 is kept in a slip-out state. Figure 4 shows that the inner square tube 12 has been retracted into the outer tube 11, so that the rear caster 13 does not land and is hidden at the back foot of the step; when the step 2 foot must be close to a working place such as a wall or a machine table At the time, the rear caster 13 is hidden behind the step 2 and does not cause obstruction.

Finally, as is apparent from the schematic diagram of Fig. 5, when the rear caster device 1 of the present invention is used to move the step 2, the step 2 can be easily pulled as long as the user lifts the front of the step 2.

The above embodiment of the "stepped stepping platform with a retractable rear caster device" is explained in detail, and the intention is to make it possible for the person familiar with the technology to realize the above-mentioned purpose, and not to limit the creation, the equivalent element Replacement, change, etc., should still belong to the scope of this creation. Furthermore, the creation of the "stepped stepper with a retractable rear caster device" is in line with the industrial use, novelty and progressiveness of the patent law, and proposes a new type of patent application in accordance with the law. Granting a patent, it is really sensible.

Claims (1)

A stepped stepper having a retractable rear caster device, having two chassis opposite to each other and a rear caster device respectively fixed to the inner rear end of the two chassis; wherein the rear caster device comprises: an outer square tube Having a first side surface veneer and inclined to be fixed to the vicinity of the rear end of the inner side of each chassis, a second side opposite to the first side and an end fixed to the second side and having a reinforcing hole of the screw hole, the screw hole penetrating through the second side; a knob bolt is screwed into the screw hole; an inner square tube is slidable in the outer tube, and has a first end, a second end and a side edge, The first end is outside the outer tube and the second end is outside the outer tube, the second end extends a support long plate along the side, and the support long plate is fixed to the side by a pull pin, the side A screw hole corresponding to the outer tube is disposed adjacent to the pull stud; a rear caster is rotatably fixed to the support long plate by a pivot; when the rear caster device is to be used to move the step, the knob is first released Bolt, let the inner tube slide out from the outer tube until the rear caster touches the ground, then turn the knob Tighten the bolt and clamp the side of the inner tube; when the rear caster device is not used to move the step, first loosen the knob bolt and push the second end of the inner tube to the outer tube until the inner tube is screwed. Align with the screw hole of the outer tube, and then screw the knob bolt into the screw hole of the inner tube, so that the rear caster does not touch the ground and is hidden at the back foot of the step.