JPS6357172B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple method for assembling a gas spring and an apparatus used for assembling the same.

Conventionally, gas springs were inserted into a cylinder held upright, with a piston and an oil lock piece connected to the piston attached, and a piston rod with an oil lock collar, gas seal, rod guide, etc. inserted, suspended. , After caulking the open end of the cylinder to the rod guide, turn the gas spring upside down with its bottom facing up, make an injection hole in the bottom, or inject oil for oil locking through the injection hole that has been drilled in advance. Then, after pressurized gas was injected, the injection hole was sealed with an appropriate means. However,
It was not an assembly device, but had separate cylinder holding devices, pressurized gas injection devices, crimping devices, etc. Therefore, since the assembly and production of gas springs is difficult and time-consuming, there has been a desire for a simplified assembly method and assembly device that can be easily produced.

As a result of repeated research to obtain a method and device for assembling a gas spring simply and easily, the inventor of the present invention achieved the objective by installing a pressurized gas injection device and a cylinder caulking mechanism side by side on one base. The present invention was made based on the discovery that the following can be achieved.

Next, one embodiment of the present invention will be described based on the accompanying drawings.

1 to 4 are cross-sectional views of essential parts showing the steps of an embodiment of the present invention. In particular, FIG. FIG. 2 is a sectional view of a main part showing an example.

A cylindrical cylinder 1 with a bottom, in which oil for oil locking is injected in advance, is held by, for example, a cylinder holder a, and a predetermined position of the cylinder 1 provided at the bottom of a base c, which is screwed to an upper frame b, is held by a cylinder holder a, for example. Insert and hold the piston rod 2 into the cylinder receiving part d, which is the receiving and holding part, and insert the piston rod 2 from above.
is connected to the piston 3 and the piston 3 at its tip, and the oil lock piece 4 is fitted and fixed therein, the oil lock collar 5 is fitted into the oil lock piece 4, and the lock guide 7 is connected to the gas seal 6.
A piston rod insertion part f having an inner diameter equal to the inner diameter of the cylinder 1 is attached to a pusher e, for example, and is provided directly above the cylinder receiving part d of the base c. During insertion, the space between the outer periphery of the cylinder 1 and the inner periphery of the insertion part f is kept airtight by a seal ring or the like. After that, before the piston 3 is inserted into the cylinder 1, a predetermined amount of pressurized gas is injected between the piston and the open end of the cylinder from the pressurized gas inlet g provided on one side of the base c. do. Next, the piston rod 2 with each part attached is further pushed into the piston rod insertion part f while resisting gas pressure using a pusher e which is hollow and has an outer diameter smaller than the inner diameter of the piston rod insertion part f, and is inserted into the open end of the cylinder 1. Align the end of the lock guide 7 and stop. Next, on the other side of the base c, the tip of the caulking claw is exactly aligned with the cylinder 1.
By activating the caulking mechanism h located at the caulking part of the cylinder 1, the open end of the cylinder 1 is pressed from the radial direction and caulked to the rod guide 7, and the gas spring is removed from the base c. End the group.

For example, in the crimping mechanism h, as shown in the figure, a plurality of crimping pawls (h-1) provided in the circumferential direction that are elastically stopped pressurized air from a cylinder (h-2) into the piston cam. (h-3) is pressed down, and the swiveling pawl (h-1), which is in contact with the piston cam (h-3) surface at an inclined plane and is stopped by a spring (h-4), is moved by the cam mechanism. A device that is used has a crimping effect by moving it forward.

Note that the crimping work can be performed so that the oil lock collar 5 can be crimped at the same time as the cylinder 1, or the oil lock collar 5 can be crimped while each part is inserted into the piston rod 2. It is also possible to caulk the cylinder 1 by aligning it with the position of the claw (h-1), insert it into a predetermined position, and then caulk the cylinder 1.

In this way, the present invention uses a base equipped with a pressurized gas inlet and a crimping mechanism, so that pressurized gas filling and crimping work can be performed almost simultaneously, making it extremely easy to assemble the gas spring. This is a simple device that can provide a gas spring that is easy to use and has increased strength because it does not require the opening and closing of gas and oil injection ports in the cylinder, and is highly effective.

[Brief explanation of the drawing]

1 to 4 are cross-sectional views of essential parts showing the steps of an embodiment of the present invention. In particular, FIG. FIG. 2 is a sectional view of a main part showing an example. 1...Cylinder, 2...Piston rod, 3
...Piston, 4...Oil lock piece, 5...
...Oil lock color, 7...Rod guide, c
... Base, d... Cylinder receiving part, f... Piston rod insertion part, g... Pressurized gas inlet, h...
...Caulking mechanism.

Claims (1)

[Scope of Claims] 1. A bottomed cylindrical cylinder of a gas spring injected with a predetermined amount of oil is inserted into a predetermined position of a base and held upright, and a piston at the tip and an oil lock connected to the piston are provided. Attach the oil lock piece, insert the oil lock collar into the state where it is fitted with the oil lock piece, and insert the piston rod with the lock guide in contact with the oil lock collar through the gas seal to the cylinder held on the base. The piston rod is suspended from directly above and airtightly inserted into the piston rod insertion part provided above the base, and the pressurized gas introduced into the base is provided between the piston and the open end of the cylinder before insertion into the cylinder. Pressurized gas is injected from the port, then the piston rod is further lowered and inserted into the cylinder until the end of the rod guide matches the open end of the cylinder, and then the crimping mechanism provided on the base is activated. The method for assembling a gas spring is characterized in that the open end of the cylinder is caulked to a rod guide, and then the gas spring thus assembled is taken out from the base. 2. A cylinder receiving part into which a cylinder can be inserted is provided at the bottom of the base, and a piston rod insertion part having an inner diameter equal to the inner diameter of the cylinder is provided directly above the cylinder receiving part, and the base is provided with an airtight seal in the insertion part. A pressurized gas inlet opening is provided between the lower end surface of the piston rod inserted into the cylinder and the upper end surface of the cylinder receiving part, and a crimping mechanism is provided for radially pressing and crimping the open end of the cylinder. A gas spring assembly device further comprising a pusher which is hollow and has an outer diameter equal to or less than the inner diameter of the piston rod insertion portion and is vertically movably attached directly above the piston rod insertion portion.