JPS5834184B2 - Oshidashi Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Devices for the extrusion of viscous but extrudable materials (e.g., caulking guns) are generally designed to ensure that when the extrusion force is stopped, the material continues to flow out of the orifice or nozzle of the device. It has the disadvantage of being squeezed out.

This is due to the expansion forces created in the material being squeezed out in opposition to the compressive forces applied to the material.

The magnitude of such expansion forces depends on many factors, such as the size and shape of the orifice, the viscosity, compressibility and elasticity of the material,
It depends on how and how much compressive force is applied, temperature, friction issues, etc.

This compression-after-expansion phenomenon is common in most extrusion equipment, from industrial plastics extrusion machines to the common manual caulking guns used by domestic holes.

Although the excess material released by this phenomenon is often tolerable and can be ignored, it is always a nuisance.

In industrial production, the squeezed extrudates are difficult to clean or too expensive to dispose of, making them cumbersome and extremely expensive.

This is a particularly troublesome problem in industrial applications involving manually operated applicator guns.

It is to these problems that the present invention is specifically directed.

Manually operated caulking guns are disclosed, for example, in U.S. Pat. No. 198
No. 6166, No. 2420203, No. 2530359, 2
No. 561825, No. 2582156, No. 2602570, No. 2602571, No. 2732102, and No. 27866
No. 04 is extremely well known.

Such guns have a fixed pivot point, allowing forward movement of the piston, plunger, and shaft assembly, but once forward movement is complete, the shaft is held back to prevent reverse movement. No tilted return (anti K
ickback) It is characterized by having a hook, pawl, or plate.

It is known to move the shaft slightly in reverse to allow expansion of the caulking material and prevent backflow from the nozzle.

U.S. Pat. No. 2,815,151 describes a complex caulking gun mechanism designed to provide a desirable degree of reverse movement of the plunger.

The present invention - provides a means for immediately relieving the tendency of compressed extrudates, such as caulks, to expand under the influence of internally generated forces when external compressive forces are removed; It is something to do.

This is accomplished by preferentially expanding the material in the direction opposite to the direction of the compressive force, eliminating or at least mitigating the tendency of the material to continue being squeezed out of the extruder nozzle.

In a representative embodiment of such a concept, the plunger advancement means compatible with standard commercially available caulking guns of the advancing plunger or piston type further comprises adaptations essentially as follows. We are prepared.

That is, the plunger rod passes through a hole drilled in the hook that is slightly larger than the rod, and the hook is pivotally mounted on one end of the hook with an extension spring for tilting the hook forward from the vertical.

Furthermore, the hook is mounted for free movement on the rod.

That is, the pivot points are vertically movable rather than fixed.

This movement is also accomplished by applying a rearward compression spring to the hook which acts in opposition to said extension spring.

The combination of these springs determines the position of the hook on the rod, allowing the hook to move forward and backward relative to the rod and the gun body.

As the rod is advanced to compress and drain the material within the gun barrel, the rod frictionally moves the hook, advancing the hook longitudinally and compressing the rearward compression spring.

In response to this movement, the extension spring retracts, thereby keeping the hook tilted forward and allowing the rod to slide through the hole.

When the forward force of the rod stops, the trapped expansion force applied to the material tends to force the rod back.

However, since the barb is angled, it grips the rod tightly around its circumference, so that the rod moves the barb longitudinally rearward and re-stretches the extension spring to release the push rod.

The backward movement of the rod engaged with the hook continues until the residual expansion force of the material balances the tension force of the extension spring.

To restrict backward movement, a stop member, for example a projection attached to an extension spring, is brought into contact with the assembly frame.

As the rod quickly retracts, the compressed material present in the orifice will overcome the force or expand preferentially pushing the plunger rearward rather than dripping.

The present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a portion of a caulking gun according to the present invention.

A rod 1 with a plunger plate 2 joined at one end is mounted to slide in bearings 3 and 4 of a handle 5.

In use, the left end of the rod 1 enters a hollow cylinder containing caulking agent with a conventional nozzle at the end or extends into a caulking agent cartridge (not shown).

The plunger plate 2 either contacts a movable seal on the rear side of the cartridge or directly contacts the caulking material, designed to seal off the end of the cartridge.

For the purposes of the invention, there are no major constraints on the design of the plunger plate 2.

A bottom plate 8 is attached to the body of the handle 5 to which the cartridge is secured and/or secured depending on the particular type of gun to be mounted and supported.

Further, the trigger 6 is attached to the handle 5 by a pivot shaft 7.

The projection 9 at the upper end of the trigger 6 is designed to contact the clutch plates 10 and 11.

These plates also face the extrusion projections 23.

The front compression spring 12 contacts the bottom plate 8 and presses the clutch plates 10 and 11 against the rear projection 9.

A generally rectangular dog 13 is slidably attached to the rod 1 passing through a slightly larger hole 14 .

The rear compression spring 15 is mounted coaxially with respect to the rod 1 so as to face the handle 5 and the hook 13.

The upper end of the hook 13 is bent to catch and hold a clip 16 which passes through the groove 17 and connects to the extension spring 18.

The other end of the extension spring 18 is connected to a pin 19 attached to a hole 20 in the handle 5.

The clip 16 is preferably made of a simple hard wire.

The ends are bent and crossed to form the junction with the spring 18, and further widened to form the fingers 21.

These fingers contact the contact surface 22 and serve to limit the extension of the spring 18.

The lower end of the hook 13 is bent to form a thumb rest 24, and when the thumb rests on the thumb rest and the spring 15 is pressed, the hook 13
becomes vertical, the engagement with the rod 1 is removed, and the rod 1 becomes free.

During operation, when the trigger 6 is strongly squeezed and an operating force is applied, the protrusion 9 pushes out the clutch plates 10 and 11 that are wedged into the rod 1.

By holding the trigger firmly, rod 1 moves forward,
The forward spring 12 is compressed and all caulking material is forced out by the clutch plates 10 and 11 in a manner known in the art.

When the rod 1 moves forward, the hook is hooked by the frictional force between the handle 1 and the hook 13, moving the hook somewhat forward, that is, toward the handle 5, and compressing the rear spring 15.

When rod 1 and hook 13 move forward, tension spring 1
8 is relaxed, thus keeping the hook 13 slightly stiff and allowing the rod 1 to slide through the hole 14.

If the rod moves backward, hold the rod 1 firmly.

When the rod 1 is sufficiently advanced, the tension spring 18
is sufficiently relaxed and the rear spring 15 is sufficiently compressed so that the hook 13 is in a substantially vertical position, the tight engagement with the rod is relaxed, and the push rod is released.

In this state, the hook 13 returns to the rear on the rod 1 by the rear swing 15, and once the compression of the spring 15 and the tension of the extension spring 18 are mutually balanced, the hook 13 is tilted and engaged with the rod 1. state.

The action described in this section can be repeated several times during the complete reciprocation of the rod 1.

When advancement of the rod ends by releasing the trigger 6 and releasing the actuating force, the trapped forces present in the compressed caulking material tend to expand the material.

In prior art caulking guns, the plunger plate or hook completely prevents backward movement of the plunger.

Therefore, the trapped forces in the caulking material "after-dribbe" the expanded material.
It was spent dripping out of the nozzle in the form of.

However, in the present invention, the hook 13 is not permanently fixed at a certain point, but can be released by "floating" the rod 1 forward or backward as described above.

When the caulking material is about to expand, the plunger plate 2, rod 1 and strongly engaged hook 13 all move rearward and the tensile force of the tension spring 18 balances the residual expansion force in the caulking material.

Extreme backward movement is prevented by engagement of the frame surface 22 of the handle 5 and the fingers 21.

As the plunger plate moves rearward, it relieves the expansion force of the caulking material and prevents but minimizes runoff.

The lower end 24 of the hook can be placed in a substantially vertical position by placing a finger on the surface, and the rod 1 can freely slide through the hole 14, allowing the plunger plate to be retracted as desired. I can do that.

It will be readily apparent to those skilled in the art that many modifications from the specific examples described above can be devised without departing from the scope and purpose of the invention.

For example, it is possible to provide the plunger with suitably designed inverted teeth.

The design of the assembly tension spring can be varied and the tension can be adjusted by combining the spring with threaded parts.

The important element is to design the device so that the hook moves freely on the plunger rod as described in the general method above.

The particular size of springs used will also depend on the overall design of the caulking gun and the physical properties of the caulking material, and will be best determined through routine experimentation.

The embodiments of the present invention are as follows.

(1) In an extrusion device that extrudes an extruded substance from a nozzle by the forward action of a plunger and an extrusion rod,
pressure relief means for releasing at least a portion of the expansion forces created in the extruded material by the compressive action of the advancing plunger to substantially stop the material from dripping out of the nozzle under the influence of the expansion forces; pressure relief means for moving the plunger and push rod a sufficient distance rearwardly;
The extrusion device also incorporates a pressure relief means in the extrusion rod, consisting of an inclined and loaded hook, which is activated when the plunger stops advancing.

(2) The device according to item (1) above, wherein the load applied to the hook is applied by a spring.

(3) The device according to item (1) above, wherein the bushing rod passes through the hole of the hook and the hook moves freely due to the opposing actions of an extension spring and a rear compression spring. (4) The rearward movement of the hook is caused by the extension spring. The device according to item (3) above, which is restricted by.

[Brief explanation of the drawing]

FIG. 1 is a partially cut away assembly view of a preferred embodiment of the invention, and FIG. 2 is a plan view of the extension spring structure. 1... Extrusion rod, 2... Plunger plate, 5... Handle, 6... Trigger,
7... Pivot shaft, 8... Bottom plate, 10, 1
1...Clutch plate, 12...Front compression spring, 13...Hook, 15...Rear compression spring, 16...Clip, 18・
...Extension spring, 19...Pin, 2
0...hole, 21...finger.

Claims (1)

[Scope of Claims] 1 (a) a cylindrical hollow body containing an extrudable substance; (b) a nozzle at one end of the hollow body through which the substance is extruded; (C) a nozzle through which the substance is compressed; a plunger plate and its extrusion rod provided to extrude it; (d) a plunger plate extrusion means that receives the actuation force and is attached to apply an actuation force to the extrusion rod and advance the plunger plate and the extrusion rod; ( e) pressure relief means for automatically retracting said extrusion rod a distance sufficient to release the expansion force generated in said material when said actuating force ceases, said pressure relief means being free to move forward and backward; 2. An extrusion device, characterized in that the extrusion device comprises a retractable hook mounted so as to be inclined by an extension spring to engage said extrusion rod and move rearwardly said sufficient distance. 2. The device of claim 1, wherein the push rod passes through a hole in the hook, and the hook is free to move under the opposing action of an extension spring and a rearward compression spring.