JPH044938Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application: The present invention relates to an improvement of an earthquake-resistant latch for a hand cart.

B. Conventional technology: As shown in Fig. 6, the conventional seismic latch for hand carts engages the latch metal member, which is biased in the engagement direction by a coil spring, against the spring pressure by depressing the pedal. The structure was such that the lock could be released.

C. Problem to be solved by the invention: Therefore, when pulling out a hand cart that is locked in the tidy position, one must depress the pedal with one foot to disengage the latch hardware, and then continue to depress the pedal while pulling out the hand cart. In addition, the user could not take his or her foot off the pedal until the latch was completely released, resulting in an unstable working posture and reduced work efficiency. In particular, when the hand cart is pushed deep under a shelf and parked in order, the working posture becomes extremely poor.

Also, when pushing the hand cart into the tidying position, it was necessary to keep the pedal depressed with one foot in order to lock the latch hardware, creating exactly the same drawbacks as when pulling the cart out.

D. Structure of the invention or means for solving problems The structure of the main idea is explained with reference to the diagrams. 1 is a cart, 2 is a pedal, 3 is a rod, 4 is a latch,
5 is a locking angle.

The cart 1 is a light transport vehicle on which boxes, baskets, etc. are fixed on a trolley with four or three wheels, and is used to transport cargo, materials, etc. in factories, warehouses, etc. according to inputs.

The pedal 2 is an L-shaped metal fitting that is pivotally supported by a pedal shaft 6, and the other end of the metal fitting is pivotally supported by a rod 3.

The end of the rod rod 3 is pivotally supported by a pedal metal fitting, and the tip is pivotally supported by a latch metal fitting 4.

The latch fitting 4 consists of a fixed seat 7, a sliding fitting 8, a latch 9 and a tension spring 10.

As shown in FIG. 5, the fixing seat 7 is a plate-shaped body with a spring hook 11 protruding forward and a hanging side wall 12, and has a screw hole 13 for fixing it to the bottom of the cart.
have. A pivot shaft hole 14 is provided in the hanging side wall 12 .

The sliding fitting 8 has an abutment piece 15 that projects forward and a hanging side wall 16 that hangs down laterally.
A sliding groove 18 that is long in the front-rear direction is provided at the base of the rotary shaft hole 17 for passing the rotation shaft hole 17 therethrough. In addition, the hanging side wall 1
The rear edge of 6 forms a cam slope 19 that slopes forward.

The latch 9 has a U-shaped cross section, has latch claws 21 curved upwardly at the front ends of both side walls 20, has a spring retaining shaft hole 23 at the upper part of the rear edge 22 of the side walls 20, and has a spring retaining shaft hole 23 at the lower edge 24 of the side walls 20. The rod shaft hole 25 is inserted into the side wall 2.
A rotation shaft hole 26 is bored approximately at the upper center of each shaft.

The fixed seat 7, sliding fitting 8 and latch 9 are as follows:
Stack the fixed seat 7, sliding fitting 8, and latch 9 in this order from above, and insert one rotating shaft through the rotating shaft hole 26 of the latch 9, the rotating shaft hole 14 of the fixed seat 7, and the sliding groove 18 of the sliding fitting 8. They are aligned by a moving shaft 17. Therefore, the fixed seat 7 and the latch 9 are rotatable about the rotation shaft 17, and the sliding fitting 8 slides along the sliding groove 18 in its length direction while being supported by the rotation shaft. It is possible.

Furthermore, when the latch fitting 4 is assembled in this way, the spring retaining shaft hole 23 and the rotating shaft hole 26 are arranged so that the spring retaining shaft hole 23 is located further away from the rotating shaft hole 26 with the spring hook 11 as the base point. Since the mutual positions of the spring catch claw 11 and the spring catch shaft 2 are determined,
When the tension spring 10 is installed between the latch 9 and
makes a toggle motion around the rotating shaft 17, and the spring stop shaft 27 moves along the cam slope 19 at the rear end of the sliding fitting 8 while being in elastic contact with the slope.

A rod shaft 28 is fitted into the rod shaft hole 25, and the rod rod 3 and the latch 9 are axially aligned.

The locking angle 5 is fixed at a position where the abutting piece 15 of the sliding metal fitting 8 hits the locking angle 5 when the cart 1 is pushed to a predetermined position, and the hanging end of the locking angle 5 is latched. It is shaped to engage with the claw 21.

In the example of the conventional cart shown in FIG. 6, a coil spring 29 is used due to the structure of the locking device.

E. Functions: The seismic latch of the hand cart of this invention has the structure as shown in the drawings and the above explanation, so it has the following functions.

When you push down the pedal 2 of the hand cart with your foot, the rod rod 3 is pulled to the left, so the rod shaft 28
moves to the left, the latch 9 rotates to the right about the rotation axis 17, and the latch pawl 21 moves to the locking angle 5.
move away from When the latch 9 rotates further and the center of the spring stop shaft 27 passes through the neutral line 30 of the toggle, it rotates further due to the force of the spring 10 until the left shoulder of the latch 9 hits the fixed seat 7. Continue. At this time, the latch 9 will not return to its original direction unless there is an external force that causes the latch 9 to rotate in the opposite direction. Therefore, the pedal 2 remains depressed and the latch pawl 21 remains open.

Also, as the latch 9 rotates, the spring stopper shaft 2
7 pushes the cam slope 19 at the rear of the sliding metal fitting 8, so the sliding metal fitting 8 projects forward and the abutment piece 15 also projects forward. That is, the state shown in FIG. 2 is reached.

In this state, the cart can move freely.

Next, when storing the cart in the normal position, when the cart is pushed into the normal position, the abutting piece 15 of the sliding fitting 8 will abut against the locking angle 5 and be pushed to the left, so that the sliding The metal fitting 8 moves to the left. Then,
The cam slope 19 pushes down the spring stop shaft 27 against the force of the spring 10, so that the latch 9
Rotate to the left around 7. When the spring stop shaft 27 crosses the neutral line 30, the latch 9 automatically rotates due to the force of the tension spring 10, and the latch pawl 21 locks on the lock angle 5.

This state is as shown in Figure 1, with the latch 9
is securely locked to the locking angle 5, and the pedal 2 is raised upward. Further, unless the pedal 2 is pressed down, the latch pawl 21 and the locking angle 5 cannot be unlocked.

F. Example: The figure shows an example of implementing the present invention, but in order to obtain the same effect, the pedal shaft 6 may be erected vertically and the pedal 2 may be placed horizontally, or the side walls of the latch hardware 4 may be assembled inward. and the outside, or
The tension spring 10 may be provided at the outermost side wall. (None of these are shown.) Effect of the invention: When pulling out a locked hand cart,
When the pedal 2 is depressed with the tip of the foot, the latch rotates and the engagement between the latch pawl 21 and the locking angle 5 is released, and when the center of the spring retaining shaft 27 crosses the neutral line 30, the toggle action of the spring 10 causes the latch to rotate. Since the latch 9 is held wide open, the latch 9 and the pedal 2 will not return even if the hand cart is operated roughly.

In addition, the pedal 2 once depressed is automatically maintained in its position due to the toggle action of the spring 10, and the latch pawl 2
Since pedal 1 remains detached, there is no need to keep pressing pedal 2 with one foot to pull out the cart.
Work efficiency can be increased without the need for unreasonable working postures.

In addition, when pushing the cart to the tidying position,
As long as the cart is pushed in, the abutting piece 15 hits the locking angle 5 and the latch pawl 21 automatically engages with the locking angle 5, so there is no need to use your feet and the work is extremely easy. It has the characteristic of being simple and easy. In this case as well, the latch pawl 21 is connected to the spring 10.
Since the engaged state is reliably maintained by the toggle action, the pedal 2 will not become disengaged due to external force other than depressing it. Therefore, even if the cart is subjected to external force such as a foreign object hitting it or the cart being shaken by an earthquake, there is no fear that the latch will become disengaged.

[Brief explanation of the drawing]

Fig. 1 is a side view of the present invention, showing the latch in the engaged state, Fig. 2 shows the latch in the disengaged state, and Fig. 3 shows the latch fitting. FIG. 4 is an enlarged sectional view to explain the toggle action, FIG. 5 is an enlarged assembly view of the main parts to explain the latch fitting, and FIG. It is an explanatory diagram. In the figure, 2...pedal, 3...rod rod, 4...latch fitting, 5...locking angle, 7...fixing seat, 8...
...Sliding metal fitting, 9...Latch, 10...Tension spring,
15...Abutting piece, 17...Rotating shaft, 18...Sliding groove, 19...Cam slope, 21...Latch pawl, 27
. . . Spring stop shaft, 28 . . . Rod shaft, 30 . . . Neutral line.

Claims (1)

[Scope of Claim for Utility Model Registration] A cross section of an earthquake-resistant latch for a hand cart consisting of a pedal for unlocking the cart, a rod connected to the pedal, and a locking fitting operated by the tip of the rod. It is U-shaped, with latch claws protruding upward at the tips of both walls, a rotation shaft hole at the top of the side wall, a spring retaining shaft hole at the top of the rear edge of the side wall, and a rod shaft hole at the bottom edge of the side wall. , the latch metal fittings that have been drilled respectively, and the fixing metal fitting that has a spring hook protruding downward from the front end and a rotation shaft hole drilled in the hanging side wall. A sliding metal fitting with an abutment piece protruding from the tip and a sliding groove on the side wall is placed between the fixing metal fitting and the latch metal fitting, and the rotation shaft hole of the latch metal fitting and the sliding metal fitting are connected to each other. The rotation shaft is inserted into the sliding groove and the rotation shaft hole of the fixing metal fitting, so that the fixing metal fitting and the latch metal fitting can be rotated, and the sliding metal fitting is held so that it can be slid back and forth, and the spring is attached. Position the rotation shaft hole and the spring stop shaft hole so that the spring stop shaft is located further away from the rotation shaft using the claw as a reference point, and install the tension spring between the spring catch claw of the fixing bracket and the spring stop shaft. An earthquake-resistant latch for a hand cart, characterized in that the spring retaining shaft is in elastic contact with the cam slope at the rear end of the sliding metal fitting, and the latch metal fitting and the pedal are connected by a rod rod.