NARROW AERIAL AND DIE-MOUNT CAMS
Narrow aerial and die-mount cams, each having a cam adapter, a driver and a slide sandwiched between the cam adapter and driver. The narrow aerial cam slide has an elongate primary portion that has a T-shaped cross-section and has a primary bearing surface, and the cam adapter has a rectangular recess. An elongate keeper plate having a longitudinal slot is secured to each side of the cam adapter adjacent the rectangular recess to slidably retain the primary portion of the slide within the longitudinal slots and the rectangular recess. The primary bearing surface and a pair of intermediate bearing surfaces formed in the slide below the primary portion slidably support the keeper plates and thus the cam adapter. The driver slidably supports the slide. The narrow die-mount cam is basically an inverted version of the aerial cam.
Latest Anchor Lamina America, Inc. Patents:
1. Field of the Invention
The invention relates generally to aerial and die-mount cams and more particularly to improvements in cams configured to provide an increased load-bearing capacity and to facilitate the fabrication of long-lived, narrow cams having components that do not require custom fitting.
2. Background Art
Aerial and die-mount cams are often used to operate tools for such manufacturing processes as punching, trimming, stamping and bending workpieces. These devices include elements that convert downward and upward forces provided by a press into laterally directed component forces that advance and retract a tool in lateral directions to effect the mentioned processes.
Since some manufacturing processes require the application of considerable forces, an important feature of cams is their load-bearing capacity. Cams in present use typically have a maximum load-bearing capacity of some 1.5 tons. Previous attempts to increase load-bearing capacity have included broadening bearing surfaces, but these have increased the width of the cams. Since cam size is a limiting factor that prohibits the use of certain cams in certain presses and for certain applications, it is thus another important feature in cam design and application.
A few of the attempts to increase load-bearing capacity of cams have included the introduction of laterally inclined bearing surfaces. These changes provided an advantage of increasing the stability of the cams as well as somewhat increasing their load-bearing capacities, but they were not directed toward reducing the lateral sizes of cams.
The wearing of parts that are in slidable contact with other parts is always a concern in mechanisms such as aerial and die-mount cams. Having to remove cams from their presses to replace worn parts can be a costly and time-consuming activity.
The structural integrity of joined parts is another important area of concern. Fasteners such as bolts that hold parts together are more likely to loosen or fail if they are placed under stress during press operation.
Many aerial and die-mount cams have configurations that are unique to their use in specific presses and for specific purposes. Their design and construction result in additional expenses.
SUMMARY OF THE INVENTIONAn object of the present invention is to provide improved aerial and die-mount cams that have a more efficient load distribution. The improved load distribution enables the cams to be narrower and to bear an increased load.
In carrying out the foregoing object, the aerial and die-mount cams each include a driver, a slide and a cam adapter arranged in vertically stacked relation. The cams have slidably arranged bearing surfaces between the driver, slide and cam adapter supporting the same for relative sliding movement upon closing and opening of platens of a press between which the cam may be arranged.
Each of the slidably arranged bearing surfaces cooperatively extend continuously across the distance between opposite sides of the driver, slide and cam adapter. The loading on the cam is therefore distributed across the entire width of the cam.
At least a portion of the bearing surfaces spacedly overlap each other, and the bearing surfaces extending between opposite sides of the cam thereby cumulatively exceed the distance between the opposite sides. This facilitates the fabrication of cams that not only have greater load-bearing capacities but also cams that are narrower and whose slides have increased angular stability.
The driver has a driver bearing surface, and the slide has a primary portion and a secondary portion. The primary portion has a T-shaped cross-section and an elongate primary bearing surface, and the secondary portion has a secondary bearing surface in slidable contact with the driver bearing surface. The slide further has a pair of parallel and laterally spaced intermediate bearing surfaces located intermediate the primary bearing surface and the secondary bearing surface. The driver bearing surface is softer than the secondary bearing surface and is formed of self-lubricating material.
The cam adapter has a rectangular recess having a rectangular recess bearing surface in slidable contact with the primary bearing surface of the slide. The recess bearing surface is softer than the elongate primary bearing surface of the elongate primary portion of the slide and is formed of self-lubricating material.
Each of a pair of elongate keeper plates, each having a longitudinal slot, are secured to one side of the cam adapter adjacent the rectangular recess to slidably retain the primary portion of the slide within the longitudinal slots and the rectangular recess. The elongate keeper plates have bearing surfaces that slidably contact the primary portion, including the primary bearing surface, of the slide and further have bearing surfaces that slidably contact the intermediate bearing surfaces of the slide. Surfaces of the first and second elongate keeper plates that contact surfaces, including the primary bearing surface, of the primary portion and that contact the intermediate bearing surfaces of the slide are softer than the primary portion and the intermediate bearing surfaces of the slide and are formed of self-lubricating material.
The keeper plates are attached to the cam adapter with fasteners such as bolts, and the assembled configuration reduces the likelihood of the bolts being loosened or damaged by minimizing the strength of forces applied to them during cam operation. The configuration of the keeper plates and the disposition of the bolts facilitates the removal and installation of the keeper plates without requiring cam removal from the press.
The rectangular recess of the cam adapter has a forward stop and a rear stop between which the primary portion of the slide is driven, and the slide also has a resilient member extending toward the forward stop. The resilient member is compressed against the forward stop as the primary portion of the slide is advanced, and the resilient member provides a slide-retracting force when the resilient member is allowed to decompress. The slide also has a shock absorber extending toward the rear stop of the rectangular recess to decelerate the slide as the slide nears a fully retracted position.
The driver has an elongate slot that extends along a portion of each side at the same angle to the horizontal as those of the driver bearing surface and the secondary bearing surface of the slide. A positive return member is secured to each side of the slide, and each positive return member has a projection that is slidably received by one of the elongate slots.
The driver bearing surface and the secondary bearing surface of the slide of the aerial cam each has an inverted V-shape that slidably conforms to the other. The driver bearing surface and the secondary bearing surface of the slide of the die-mount cam each has a V-shape that slidably conforms to the other.
The aerial and die-mount cams are basically inverted versions of each other. Efficiencies of assembly and installation and reduced expenses can be realized by using cam adapters, slides and drivers that have components that do not require custom fitting. The self-lubricating material on one of each pair of bearing and contacting surfaces extend the life of contacting surfaces that slide relative to one another.
BRIEF DESCRIPTION OF THE DRAWINGS
It should be noted that, when the term “cam” is used in this specification without particular reference to the type of cam, the term refers inclusively to aerial cams and die-mount cams. It should be further noted that
Also shown by
Except for having a driver 16′ with an uninclined driver bearing surface 46′ rather than an inclined driver bearing surface as with the driver 16 (
A V-block 44′, having an inverted-V-shaped driver bearing surface, generally indicated by the reference numeral 46′, is secured atop the driver 16′ by fasteners such as bolts 48′, and slidably supports the slide 14′. The driver bearing surface 46′ of the V-block 44′ upon which the slide 14′ is slidably supported is softer than the secondary bearing surface 19′ of the slide 14′ and is preferably formed of self-lubricating material. The driver bearing surface 46′ is uninclined to the horizontal, and the driver 16′ has a second elongate slot 52′ that is also uninclined to the horizontal. A second positive return member 56′ is secured within a second recess 60′ to the second side 38′ of the slide 14′ by a fastener such as a bolt 62′. At an end distal from the bolt 62′ securing the second positive return member 56′ to the slide 14′, the second positive return member 56′ has a generally rectangular second projection 66′ that slidably extends into the second elongate slot 52′.
As revealed by the exploded view of
The mutually inwardly facing inner bearing surfaces of the first and second elongate keeper plates, 30′ and 32′ respectively, have first and second longitudinal slots 68′ and 70′ that slidably receive the generally rectangular elongate primary portion 72′ of the slide 14′. The configuration of the primary portion 72′ and of the intermediate bearing surfaces 78′ and 80′ of the slide and their cooperation with the rectangular recess bearing surface of the cam adapter 12′ and with the bearing surfaces of the elongate keeper plates 30′ and 32′ contribute to the increased load-bearing capacity of the cam and to an increased lateral and angular stability of the slide 14′ of the cam. The slide 14′ has three bearing surfaces that receive downward forces from the cam adapter 12′ and the elongate keeper plates 30′ and 32′ when the cam adapter 12′ is forced downwardly by the upper platen 21 of the press (not shown). The top of the elongate primary portion 72′ forms an elongate primary bearing surface 82′; and lower bearing surfaces of the first and second elongate slots 74′ and 76′ extend laterally to form first and second central bearing surfaces, 78′ and 80′ respectively.
The elongate primary bearing surface 82′ receives downward forces directly from the cam adapter 12′ and indirectly from upper edges of the first and second longitudinal slots 68′ and 70′ of the first and second elongate keeper plates 30′ and 32′. The first and second central bearing surfaces 78′ and 80′ receive forces respectively from the first and second lower bearing surfaces 98′ and 100′ of the first and second elongate keeper plates 30′ and 32′. The rectangular recess bearing surface 93′ (shown by the broken away portion) of the rectangular recess 92′ is softer than the elongate primary bearing surface 82′ of the elongate primary portion 72′ of the slide 14′ and is preferably formed of self-lubricating material.
As represented by portions shown by
The bearing surfaces cooperatively extend continuously across the distance between opposite sides of the driver, slide and cam adapter, distributing loads across the entire width of the cam. Moreover, as shown best by
The portions of bearing surfaces overlapped represent bearing surfaces in excess of those necessary to cooperatively extend continuously across the distance between opposite sides of the driver, slide and cam adapter; and they do so without adding to the overall width of the cam. These features facilitate the fabrication of cams that are narrower and whose slides have increased angular stability. The configuration provides the cams of the present invention with a load-bearing capacity of some 4 tons.
The narrow aerial cam 10′ shown by
At an end distal from the bolt 62′ securing the second positive return member 56′ to the slide 14′, the second positive return member 56′ has a generally rectangular second projection 66′ that slidably extends into the second elongate slot 52′ of the driver 16′. A first generally rectangular projection (not shown but a mirror image of the second projection 66′) slidably extends from a first positive return member 54′ into a first elongate slot (not shown but a mirror image of the second elongate slot 52′) in the driver 16′.
When the slide 14′ is to be retracted, the cam adapter 12′ shown by
Likewise, with reference to
Also shown by
The slide 214 is configured to support a tool holder 204 that is capable of holding any of a number of well-known tools such as a representative punch 202 shown. The cam adapter 212, being on the bottom, slidably supports the slide 214, which in turn slidably supports the driver 216. The components and features of the opposite side of the narrow die-mount cam 210 shown by
As described for elements of the cams shown by previous figures, similar respective bearing surfaces that are not exposed by
The operation of the die-mount cam 210 is similar to that of the aerial cam 10. As the driver 216 is forced downwardly by the upper platen 21 of the press (not shown) and the slide 214 advances along the cam adapter 232, the tool 202 (
While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.
Claims
1. A narrow aerial or die-mount cam for use in confined spaces, comprising:
- a driver, a slide and a cam adapter arranged in vertically stacked relation;
- slidably arranged bearing surfaces disposed between the driver, slide, and cam adapter supporting the same for relative sliding movement upon closing and opening of platens of a press between which the cam may be arranged; and
- each of the slidably arranged bearing surfaces cooperatively extending continuously across the entire distance between opposite sides of the driver, slide and cam adapter, whereby the loading thereon is distributed at least across the entire width of the cam.
2. The invention defined by claim 1, wherein at least a portion of the bearing surfaces spacedly overlap, the bearing surface extending between opposite sides of the cam thereby cumulatively exceeding the distance between the opposite sides.
3. The invention defined by claim 2, wherein the driver has a driver bearing surface.
4. The invention defined by claim 3, wherein the slide comprises a primary portion and a secondary portion, the primary portion having a T-shaped cross-section and an elongate primary bearing surface, the secondary portion having a secondary bearing surface in slidable contact with the driver bearing surface, the slide further having a pair of parallel and laterally spaced intermediate bearing surfaces located intermediate the primary bearing surface and the secondary bearing surface.
5. The invention defined by claim 4, wherein the driver bearing surface is softer than the secondary bearing surface and is formed of self-lubricating material.
6. The invention defined by claim 4, wherein the cam adapter has a rectangular recess having a rectangular recess bearing surface in slidable contact with the primary bearing surface of the slide.
7. The invention defined by claim 6, wherein the recess bearing surface is softer than the elongate primary bearing surface of the elongate primary portion of the slide and is formed of self-lubricating material.
8. The invention defined by claim 6, further including a pair of elongate keeper plates, each having a longitudinal slot and each being secured to one side of the cam adapter adjacent the rectangular recess to slidably retain the primary portion of the slide within the longitudinal slots and the rectangular recess, the elongate keeper plates having bearing surfaces that slidably contact the primary portion, including the primary bearing surface, of the slide and further having bearing surfaces that slidably contact the intermediate bearing surfaces of the slide.
9. The invention defined by claim 8, wherein surfaces of the first and second elongate keeper plates that contact surfaces, including the primary bearing surface, of the primary portion and that contact the intermediate bearing surfaces of the slide are softer than the primary portion and the intermediate bearing surfaces of the slide and are formed of self-lubricating material.
10. The invention defined by claim 8, wherein the rectangular recess of the cam adapter has a forward stop and a rear stop between which the primary portion of the slide is driven, and the slide further comprises a resilient member extending toward the forward stop, the resilient member being compressed against the forward stop as the primary portion of the slide is advanced, the resilient member providing a slide-retracting force when the resilient member is allowed to decompress.
11. The invention defined by claim 10, wherein the resilient member is a gas spring.
12. The invention defined by claim 10, the slide further comprising a shock absorber extending toward the rear stop of the rectangular recess to decelerate the slide as the slide nears a fully retracted position.
13. The invention defined by claim 10, wherein the driver has an elongate slot that extends along a portion of each side at the same angle to the horizontal as those of the driver bearing surface and the secondary bearing surface of the slide.
14. The invention defined by claim 13, further comprising a positive return member secured to each side of the slide, each positive return member having a projection, each elongate slot slidably receiving one of the projections.
15. The invention defined by claim 14, wherein the driver bearing surface and the secondary bearing surface of the slide of the aerial cam each has an inverted V-shape that slidably conforms to the other.
16. The invention defined by claim 15, wherein the inverted V-shaped bearing surface of the driver is formed of self-lubricating material.
17. The invention defined by claim 16, wherein the inverted V-shaped bearing surface of the driver is provided by a separate inverted V-block secured to the driver.
18. The invention defined by claim 14, wherein the driver bearing surface and the secondary bearing surface of the slide of the die-mount cam each has a V-shape that slidably conforms to the other.
19. The invention defined by claim 18, wherein the V-shaped bearing surface of the driver is formed of self-lubricating material.
20. The invention defined by claim 19, wherein the V-shaped bearing surface of the driver is provided by a separate V-block secured to the driver.
Type: Application
Filed: Jul 27, 2004
Publication Date: Feb 2, 2006
Applicant: Anchor Lamina America, Inc. (Farmington Hills, MI)
Inventor: Erich Fidziukiewicz (South Lyon, MI)
Application Number: 10/899,601
International Classification: B21J 9/18 (20060101);