JPS6327569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a riveting device for use in securing two or more sheets of material together, and more particularly to a new type of pot rivet fastener.

Conventional pot rivet assemblies are well known in the art. A typical potprivet assembly is
It consists of two main parts, the driving pin and the rivet housing. Drive pins are primarily solid cylindrical rods made of hardened material such as steel. The housing is essentially a hollow cylindrical tube open at both ends with a peripheral flange at its upper end. The inside of the housing is a hollow cylindrical cavity that emerges through the ends of the housing and has a diameter slightly smaller than the diameter of the top of the driving pin and tapers in decreasing size towards the bottom of the housing. The bottom of the housing is longitudinally cut in three or four places (equally spaced 120° or 90° apart), and these slits are cut along the housing over a portion of its length. It extends upward and is stopped before reaching the upper flange. The length of the housing that is left uncut is determined by the thickness of the materials being joined.

In a combined pot rivet device, the drive pin is mounted to the housing from the top such that part of its length is exposed above the flange of the housing. The drive pin is held in place by a friction fit as it is slightly larger than the upper cavity of the housing and extends as deep into the housing chamber as the interior of the sloped housing will allow without deforming the rivet housing. . Note that the total length of the driving pin is longer than the total length of the housing.

Typical potprivate fasteners are used in the following manner. First, the materials to be bonded, which are typically thin metal substrates, are superimposed on each other. A hole is then drilled through the substrate or sheet to which the rivet is attached, the diameter of the hole being just large enough to fit within the rivet housing.
The rivet is then manually inserted into the hole bottom first so that it is secured, and the top flange prevents the rivet from being driven completely through the substrate. The rivet is properly positioned when the bottom of the top flange is flush against the substrate above. The length of the rivet housing is selected in relation to the materials to be joined such that a portion of the housing emerges from the other side of the substrate into which the housing fits.

The rivets are then secured in the manner described below.
The blow is applied to the rivet head by an operator striking a driving pin that projects above the flange of the housing. The pin is thus driven further downward into the sloped internal cavity of the housing, and the force of the blow mushrooms the slitted part of the housing on the other side of the base plate, thereby causing the rivet,
The sheets to be joined are thus firmly fixed in place. In the normal case, the upper surface of the driving pin will coincide with the upper flange when the riveting is completed, and the lower part of the pin will protrude slightly from the bottom of the split housing. The operating blow that initiates this sequence of actions is applied by an operator using a simple hand hammer, pneumatic tool, or similar device.

Although effective, this conventional type of rivet fastener encounters several problems in use. First, the riveting holes must be drilled into the workpiece in an operation separate from the riveting itself.
The rivet must then be inserted into this hole by hand. Next, the operator must actually secure the rivet in place. Obviously, these three
The step-by-step riveting method is time consuming. Moreover, in most cases, especially when the workpiece is composed of thin metal sheets, this method of riveting tends to distort the sheets and requires heavy supports.

Some objects of the present invention are to solve the above-mentioned problems with pot-private fasteners.
One such objective is to integrate the conventional three-step riveting process into one simple operation performed by an operator using a simple hammer, pneumatic tool, or similar equipment. . The second purpose is
Eliminating the need for additional time and equipment to drill rivet holes. A third purpose is to reduce or completely eliminate distortions in the workpiece that occur during normal riveting operations.

Another important purpose is to make the potprivet assembly 3
It is an object of the present invention to provide a pot rivet assembly which is constructed from separate, separately formed elements, which is easy to assemble and manufacture, and which provides a secure and firm grip on a workpiece. Yet another object of the invention is to provide a plurality of pot rivet assemblies in the form of strips that can be used with automatic percussion tools to speed up riveting operations.

These and other objects of the present invention are:
BRIEF DESCRIPTION OF THE DRAWINGS It will become clearer from the following description, which refers to the accompanying drawings, in which like numerals indicate like parts.

The potprivet assembly shown in FIGS. 1 to 7 is
It consists of three main parts: a pin 1, a rivet housing 3, and a punching pin 5. As shown in FIG. 1, the driving pin has an integral different circular upper flange 7 of diameter A, and an integral cylindrical shaft 9 of diameter B extends from the flange 7. As shown in FIG. The shaft 9 is stepped so as to form a diameter C and a bottom 11. Preferably, the seam between the top and bottom 11 of the shaft 9 is 13
It has a slope as shown. Preferably, but not necessarily, the bottom part 11 of the shaft
is rounded at its lower end as shown. Diameter A is larger than diameter B by a significant amount; preferably diameter B is about 0.0254 to 0.127 mm (0.001 mm).
(0.005 inch) greater than diameter C by 0.005 inch). The driving pin is made of a very strong and hard material, for example steel, and is of unitary construction.

FIG. 2 shows a preferred embodiment of the rivet housing. The housing is essentially a hollow cylindrical tube 15 with an enlarged peripheral upper flange 17 and open at both ends. The entire housing is of unitary construction and is preferably made of resin, but may also be made of aluminum, steel or other suitable materials. The tube 15 has a central bore consisting of a relatively large cylindrical upper part 19, a relatively short cylindrical lower part 21, and a relatively short truncated conical part 23, with the upper part 19 being smaller than the lower part 21. also has a large diameter. The housing is cut longitudinally at four points at the bottom to form four fingers 37. The slits 25 are mutually
spaced equally at 90°. Of course, a different number of slits may be provided, for example three slits spaced 120° apart. The slit extends upwardly along the housing for a portion of the length of the housing. The length of the uncut housing and the length of the housing itself are determined by the thickness of the substrates to be bonded. In a preferred embodiment, the flange 17 of the housing has approximately the same diameter as the flange 7 of the drive pin, and moreover, the top 19 of the central hole of the housing 3 is slightly wider than the bottom or bottom 11 of the drive pin. It is small (0.0254-0.0762 mm) and the overall length of the housing is somewhat shorter than the overall length of the drive pin shaft.

As shown in FIG. 4, the drilling pin 5 has a conical head 27 and a cylindrical shaft 29 projects from the center of the flat bottom of the head. The shaft 29 has a diameter slightly larger (0.0508 to 0.1016 mm) than the bottom or lower portion 21 of the central hole of the housing 3. The pin 5 is made of a very hard and durable material, for example hardened steel, and is of unitary construction. The conical head 27 of the drilling pin has a diameter at its bottom slightly larger (0.127 to 0.254 mm) than the outside diameter of the tube 15 but smaller than the diameter of the flange 17 of the housing.

What are driving pins, housings, and drilling pins?
It is assembled in the manner shown in FIG. The cylindrical shaft 29 of the drilling pin is inserted into the lower part 21 of the hole in the bottom of the housing until the bottom of the conical head 27 coincides with the flat bottom end surface 31 of the housing. It should be noted that the diameter of the shaft 29 is actually slightly larger than the diameter of the lower portion 21 of the hole in the housing, so as to form a simple friction fit to hold the drilling pin in place.
9 is sufficiently long to extend to the top 19 of the hole.

Next, the lower part 11 of the driving pin is attached to the hole portion 19
is inserted into the upper part of the housing through the Preferably, the driving pin is inserted deep enough so that the upper part of the shaft 29 of the drilling pin contacts its bottom end, so that a portion of the lower part 11 is above the housing in the manner shown in FIG. still be exposed to.
Note that the lower part 11 of the shaft of the driving pin is connected to the upper part 19 of the hole.
A friction fit is formed to hold these parts in place.

This new potprivate fastener is used and operates in the following manner. First, the materials to be joined, shown as two thin metal sheets 33, are placed against each other. Next, the rivet assembly with the piercing pin head 27 first is attached to the seat 33.
The operator applies a blow to the upper part of the flange 7 of the driving pin. This blow may be applied in the usual manner by an air gun or similar device.

A worker strike results in the following sequence of events. The driving pin 1 is pushed downward into the housing, thereby forcing the piercing pin into the seat 33. When the first blow is of suitable force, the piercing pin passes completely through the sheets 33, thereby forming a rivet hole 35 in each sheet. During this time, the driving pin 1 continues to be inserted into the housing, and the upper part of the shaft 9 of the pin 1 meets the upper end of the housing 3, thereby inserting the housing into the newly created matching rivet hole 35. Conical head 2 of the drilling pin forming the rivet hole
The flange 17 of the housing, which has a diameter larger than 7, is stopped at the upper sheet or substrate.
The length of the rivet housing 3 is such that the bottom end of the housing projects below the lower substrate 33 when the flange 17 engages the upper substrate. The drive pin continues to engage downwardly under the force of the first impact, thereby expanding the housing 3 such that the upper part of the shaft 9 grips the surrounding surface of the base plate 33 forming the hole 35. Finally, the tip of the driving pin 1 is
The fingers 37 of the housing are pressed so as to meet the scent aperture 23 of the housing and, with the aid of the slit 25 of the housing, spread out in the manner shown in FIGS. 6 and 7, so that the bottom end of the housing is The upper flange 17 is tightened to the lower board to firmly fix the rivet in place, the upper flange 17 is tightened to the upper board by the flange 7, and the bottom end of the shaft 9 of the drive pin 1 is connected to the housing on the other side of the board. protrude from Obviously, the number of parts 37 forming the essential part of the rivet housing is determined by the number of slits 25;
Modifications may be made without departing from the invention. During operation of this device, the drilling pin does not separate from the housing until the hollow housing begins to penetrate the workpiece. It should be noted that the outer diameter of the conical head of the drilling pin is larger than the outer diameter of the hollow housing, so that the hole formed in the workpiece with the drilling pin is larger than the housing. This ensures that there are no obstructions to the housing passing through the workpiece, so that the housing is not buckled or otherwise damaged as a result of interference by the workpiece.

There are many benefits to be gained by using the present invention in place of conventional potprivate bets. Firstly,
There is no need to pre-drill rivet holes. Drilling and fixing are done in one quick operation. On top of that,
The rivets do not need to be inserted into the rivet holes by hand because the rivets are installed as part of a three-step riveting procedure. Additional gripping force is provided by the inflated housing 15. Furthermore, when the invention is used in conjunction with a quick-acting tool such as a pneumatic percussion device, the perforation of thin substrates is done so quickly that the rivet can be used without any support to the substrate. No significant distortion occurs on the substrate even when the substrate is exposed. If supports are used in conjunction with quick-acting tools, distortion of the substrate metal is completely eliminated.

Furthermore, a plurality of these rivets can be combined into a strip as shown in FIG. These strips can be fed into a suitable pneumatic tool as they are driven, thus reducing labor costs and operator fatigue due to the fast operating speed and semi-automatic operation.

The rivet strip of FIG. 8 is made in the following manner. The upper disk flange of the driving pin is
They may be arranged in a straight line, aligned with each other in the tangential direction, and may or may not be fixed to each other. These are
In FIG. 9 it is shown in an unfixed manner. The rivet housing is similarly aligned and its upper flange is aligned as shown in FIG.
Connect to each other in the tangential direction. These flange 1
7 are attached to each other at their mutual cutting lines so as to fix the rivets in a strip. This attachment may be accomplished by casting several housings as an integral strip, or the housings may be formed separately from each other and their flanges bonded together as a subsequent operation. In either case, the area formed by each flange 17 relative to its adjacent flange is made sufficiently weak that it can be separated by the shearing action produced by the hammer.

This strip of pot rivets shown in FIG. 8 can be used in conjunction with the magazine shown at 38 in FIG. The magazine 38 is attached to the opposing side wall 3
It has 8A and 38B. Each side wall is provided with two grooves 39,40. The grooves 39 are opposite each other adjacent to the top of the magazine, while the grooves 40 are
Adjacent to the bottom and facing each other. The dimensions of the magazine are such that a strip of rivets or even a single rivet can be inserted into the internal chamber 41 of the magazine from a direction perpendicular to this cross-sectional view. The upper flange 7 of the drive pin fits into the upper set of grooves 39, and the flange 17 of the rivet housing
It fits into the bottom set of grooves so that it is completely constrained in two dimensions in the plane of the figure. The strip of pot rivets is therefore vertically movable along the chamber 41 and guided by the groove walls of the magazine, so that each rivet can be delivered from the magazine to the position where it will be driven into the workpiece. . It is contemplated that a magazine containing a strip of rivets may be used in conjunction with a pneumatic tool of the type shown in US Pat. No. 3,954,176.

For example, a strip of rivets constructed as used in a magazine feed striker of the type shown in the aforementioned U.S. Pat. No. 3,954,176 may be combined in the manner shown in FIGS. 12 and 13. This different embodiment shows that the rivet assembly of FIGS. 1-10 is slightly modified by forming the drive pin 1A with an upper flange 7A which is smaller than the flange 7 and therefore smaller than the flange 17 of the housing. It requires that. As shown in Figures 1 to 10,
The upper flanges 17 of the rivet housing may or may not intersect with each other, depending on how the rivets are connected to each other. Rivets are attached to each other at the point of mutual cutting, but
This attachment may be accomplished by casting the several housings as one integral strip, as shown in Figure 8, or by forming the housings separately from each other and then gluing their flanges together as a subsequent operation. This will be implemented by However, preferably the resin strip 42 is
It is formed to surround the upper flange 7A in the manner shown in the figure and connects the flange. This strip is
It consists of a series of circular caps 43 having an outer diameter approximately equal to the outer diameter of the flange 17 of the housing and connected to each other in a strip-like manner by truncated lines. Each cap 43
The ring has a slightly smaller inner diameter (0.0762 to 0.1524 mm) than the upper flange 7A of the driving pin, and has just enough elasticity to allow the ring to expand and form a dense shape when pressed against the flange 7A. The caps are constructed from friction fit materials such that the caps cooperate to retain the drive pin and thus the rivet assembly in place as an integral strip of rivet. The strips 42 are weakened at the points where the caps 43 are joined to each other, for example by providing razor slits 44;
When the ring and/or the corresponding flange 7A are struck with a hammer, shearing of the cap 43 is made possible with the hammer of a pneumatic striking device as shown in US Pat. No. 3,954,176.

Although the rivet assembly shown in FIGS. 12 and 13 is not necessarily required, a recess 45 in the upper surface of the housing having the same size and shape as the upper flange 7A is used.
, so that when the driving pin is pressed downward during a driving operation, its flange 7A rests against the upper surface of the housing.

Finally, the preferred embodiment illustrated and described herein:
It is provided by way of example only and should not be construed as limiting the scope of the invention, but it is understood that various changes may be made to the illustrations without departing from essential characteristics of the invention. This is because it can be implemented in Examples. Therefore, for example, changing the number of slits 25 in the rivet housing, changing the number of pins 5
The installation of a groove in the distribution head 27 of the pin or one or more components of the rivet assembly from circular to polygonal in shape with three, four or more sides so as to improve the drilling action of the pin. The cross-sectional shape may be changed. It is also conceivable to provide a razor slit, such as slit 44, at the point where the flanges 17 are joined together, so that the shearing action of a hammer of a pneumatic tool such as that shown in U.S. Pat. Subsequent separation of the rivet assembly is facilitated. Additionally, the materials from which the rivet components are made may vary. Preferably, the driving pin and the piercing pin are made of metal, and the housing is made of resin. However, all three elements of the rivet may be made of the same material of the same type of material, for example all metal or plastic. Furthermore, as an example, pins 1 and 5
may be made of steel, and the housing 3 may be made of aluminum. Also, the strip 42
may be made of a soft metal, such as aluminum, and pin 1A may be made of steel. Preferably, the strip 42 is made of polyethylene;
Housing 3 is made of polypropylene.

In any case, the material chosen for the driving pin and the drilling pin must have sufficient hardness for the above-mentioned function, while the housing must have sufficient hardness to expand and secure itself to the workpiece. It must have good tensile strength, elasticity, and bending strength.

These and other changes in type are readily apparent to those skilled in the art.

[Brief explanation of drawings]

Fig. 1 is an elevational view of a driving pin which is a component of a pot rivet fastener constituting a preferred embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the housing of the same embodiment, and Fig. 3 is a bottom view of the same. , FIG. 4 is an elevational view of the drilling pin of the same embodiment, and FIG. 5 is a partially cross-sectional view of the punching pin located on the two plates before being struck by the operator's tool of the same embodiment. 6 is a partial cross-sectional elevational view of the same embodiment after it has been struck by a worker's tool, FIG. 7 is an elevational view of the same as the above, and FIG. 8 is a strip-shaped combination. 9 is a plan view taken along the line 9-9 of the same as above, FIG. 10 is a sectional view taken along the line 10-10 of FIG. 8, and FIG. FIG. 11 is a cross-sectional view of an embodiment of the invention installed in the chamber of a magazine for use in a percussion tool, and FIG. 12 is a third embodiment of the invention having a plurality of rivet fasteners assembled in a strip. FIG. 13 shows a plan view taken along the line 13--13 of the same. 1, 1A... Drive pin, 3... Rivet housing, 5... Drilling pin, 7, 7A... Drive pin flange, 9... Drive pin shaft, 11...
Bottom of shaft, 15... tube of housing, 17... flange of housing, 19, 21... top and bottom of hole in housing, 25... slit in housing, 27... conical head of drilling pin, 29... ...Axis of the drilling pin, 31...Bottom end surface of the housing, 33...
...Metal sheet, 35... Rivet hole, 42... Resin strip, 43... Circular cap, 45...
Recess in the top of the housing.

Claims (1)

[Scope of Claims] 1. In response to a single blow by an operator, a rivet hole is formed in a workpiece consisting of at least two members, a pot rivet is inserted into the rivet hole, and the pot rivet is inserted into a predetermined location. A potprivet assembly adapted to secure a potprivet, comprising: (a) a piercing pin that punches a hole through the workpiece when a force is applied; (b) a hollow housing having a top end and a bottom end; ) (i) transmitting a force to the drilling pin to punch a hole through the workpiece; (ii) mounting the housing in the hole; and (iii) securing the housing to the workpiece. and a driving pin for
each as a separately formed individual element, the piercing pin extending to and projecting from the bottom end of the housing, and the driving pin extending to and projecting from the top end of the housing. protruding, each of the drilling pin and the driving pin being separately attached to the housing, and when the driving pin is further driven into the housing in the direction of the drilling pin, the driving pin engages the drilling pin; The driving pin and the housing are arranged such that upon being propelled out of the housing, the driving pin is in a tight friction fit with the housing and expands the housing radially to tightly grip the workpiece. A potprivet assembly characterized by comprising: 2, wherein the housing has a central hole with an upper portion having a first predetermined diameter and a lower portion having a second predetermined diameter smaller than the first predetermined diameter; and a peripheral flange at the upper end of the shaft. the piercing pin has an axis having at least a portion thereof a diameter larger than the second predetermined diameter, an upper portion of the driving pin projects from the housing, and the peripheral flange is located outside the housing. The lower part of the driving pin is located at the upper part of the hole and is held by the housing, and the part of the shaft of the drilling pin is located at the lower part of the hole and is gripped by the housing. Claim 1 being held
Potprivet assembly as described in section. 3. The length of the driving pin is longer than the length of the housing, and when the driving pin is further driven into the housing, the driving pin releases the drilling pin from the housing. It is becoming increasingly popular to
A potprivate bet assembly according to claim 1. 4. A pot-private bet assembly according to claim 1, wherein at least one additional pot-private bet assembly of similar construction is attached to form a strip of potprivate bet assemblies. 5. A strip of potprivet assembly comprising: (a) a plurality of perforating pins that punch holes through the workpiece when a force is applied; and (b) each having a top end and a bottom end, the strips having continuous attached to each other in the form of strips,
a plurality of hollow housings; (c) (i) transmitting a force to the drilling pin for punching a hole through the workpiece; (ii) mounting the housing in the hole; and (iii) a plurality of drive pins for securing the drive pin to a workpiece, each of the drilling pin and the drive pin being separately formed as a different and separate element, and the housing being separate from the drilling pin and the drive pin. wherein the driving pin and the drilling pin extend to and project from the top and bottom ends of the housing, respectively;
The driving pin and the housing are arranged such that when the driving pin is driven further into the housing in the direction of the drilling pin, the driving pin urges the drilling pin to be released from the housing. A strip of pot rivet assembly characterized in that a drive pin is configured to have a tight friction fit with said housing and to cause said housing to expand radially to tightly grip each workpiece.