CN108400031B - Reset key of limit switch - Google Patents
Reset key of limit switch Download PDFInfo
- Publication number
- CN108400031B CN108400031B CN201710065757.2A CN201710065757A CN108400031B CN 108400031 B CN108400031 B CN 108400031B CN 201710065757 A CN201710065757 A CN 201710065757A CN 108400031 B CN108400031 B CN 108400031B
- Authority
- CN
- China
- Prior art keywords
- reset
- plunger
- assembly
- shaft
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
Landscapes
- Push-Button Switches (AREA)
Abstract
Embodiments are generally directed to a limit switch, comprising: a switch housing; a contact block assembly configured to be mounted inside the switch housing, the contact block assembly including a contact plunger and a switch circuit; a head assembly including a lever, the head assembly configured to attach to a switch housing; a reset plunger configured to be mounted inside the housing, the reset plunger configured to interact with the head assembly and the contact plunger; and a reset assembly comprising a reset button and a reset shaft, wherein the reset assembly is disposed inside the head assembly, and wherein the reset shaft is configured to interact with the reset plunger.
Description
Technical Field
The present application relates to limit switches and methods for operating the same.
Background
Limit switches may be used for several applications where physical movement of one or more objects is measured. The limit switch may comprise a portion designed to come into contact with an object in order to detect movement via physical contact. Further, the limit switch may include an indicator for a particular detection, such as an alarm or warning when a certain movement is detected. Limit switches may be used in control systems, compliance detection systems, safety interlock systems, counting objects passing through points, and for determining the presence or absence of an object, the passage, the location, and the end point of travel.
Disclosure of Invention
In an embodiment, the limit switch may include: a switch housing; a contact block assembly configured to be mounted inside the switch housing, the contact block assembly including a contact plunger and a switch circuit; a head assembly including a lever, the head assembly configured to attach to a switch housing; a reset plunger configured to be mounted inside the housing and configured to interact with the head assembly and the contact plunger; and a reset assembly including a reset button and a reset shaft, wherein the reset assembly is disposed inside the head assembly, and wherein the reset shaft is configured to interact with the reset plunger, wherein the shaft inside the head assembly moves the reset plunger downward against the bias when the lever is rotated relative to the switch housing, wherein the reset shaft moves into an opening in the reset plunger due to the bias on the reset shaft when the reset plunger is moved downward a predetermined amount, wherein the contact plunger also moves downward against the bias when the reset plunger is moved downward, and wherein the contact plunger is configured to control the switch circuit based on the position of the contact plunger inside the contact block assembly.
In an embodiment, a method for operating a limit switch may include: assembling a reset plunger into a shell of the limit switch and between a head assembly of the limit switch and a contact block assembly of the limit switch, wherein the reset plunger interacts with a contact plunger of the contact block assembly; assembling a reset assembly inside the head assembly, wherein the reset assembly interacts with the reset plunger; rotating a shaft of a head assembly to measure physical movement of the object through physical contact between the shaft and the object; the reset plunger moves downward against the bias due to rotation of the shaft; the contact plunger moves downwardly against the bias due to the downward movement of the reset plunger; controlling a switching circuit based on movement of a contact plunger; locking the reset plunger in place via interaction between the reset assembly and the reset plunger when the reset plunger is moved downward a predetermined amount; actuating the reset plunger to move upward by moving the reset assembly away from the reset plunger; moving the reset plunger upward based on the bias; moving the contact plunger upward based on the bias voltage; and controlling the switching circuit based on the movement of the contact plunger.
In an embodiment, the limit switch may include: a head assembly including a shaft; a housing configured to attach to a head assembly; a contact block assembly configured to be mounted inside the housing, the contact block assembly including a contact plunger and a switching circuit; a reset assembly comprising a reset button, a reset shaft, and a reset spring, wherein the reset assembly is disposed inside the head assembly via a recessed opening in the head assembly; and a reset plunger configured to contact the shaft and the contact plunger, wherein when measured by the limit switch, the shaft rotates relative to the switch housing, causing the reset plunger to move downward against the bias, wherein when the reset plunger is moved downward by a predetermined amount, the reset shaft moves into the opening in the reset plunger due to the bias on the reset shaft, wherein when the reset plunger is moved downward the contact plunger also moves downward against the bias, wherein the contact plunger is configured to control the switching circuit based on the position of the contact plunger within the contact block assembly, and wherein when a user pushes the reset button, the reset shaft is removed from the opening in the reset plunger, thereby releasing the reset plunger and the contact plunger due to the bias to move upward.
Drawings
For a more complete understanding of this disclosure, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference numerals represent like parts.
Fig. 1 shows an exploded view of a limit switch according to an embodiment of the present disclosure.
Fig. 2 shows a side view of a portion of a limit switch according to an embodiment of the present disclosure.
Fig. 3 illustrates a front view of a portion of a limit switch according to an embodiment of the present disclosure.
Fig. 4A-4B illustrate cross-sectional views of a portion of a limit switch according to embodiments of the present disclosure.
Fig. 5 illustrates an exploded view of a reset assembly for use with a limit switch according to an embodiment of the present disclosure.
Detailed Description
It should be understood at the outset that although illustrative embodiments of one or more embodiments are illustrated below, the disclosed systems and methods may be implemented using any number of techniques, whether currently known or in existence. The present disclosure should in no way be limited to the illustrative embodiments, drawings, and techniques illustrated below, but may be modified within the scope of the appended claims along with their full scope of equivalents.
The following brief definitions of terms shall apply throughout the present application.
The term "comprising" means including but not limited to, and should be interpreted in the manner as commonly used in the context of this patent.
The phrases "in one embodiment," "according to one embodiment," and the like generally indicate that a particular feature, structure, or characteristic described in connection with the phrase may be included in at least one embodiment of the invention, and may be included in more than one embodiment of the invention (importantly, such phrases do not necessarily refer to the same embodiment).
If this specification describes something as "exemplary" or "an example," it should be understood that it refers to a non-exclusive example.
The terms "about" or "approximately" and the like, when used in reference to a number, may indicate that the particular number, or alternatively a range proximate to the particular number, as understood by those skilled in the art; and is
If it is stated in this specification that a component or feature "may", "can", "should", "will", "preferably", "may", "typically", "optionally", "for example", "often" or "may" (or other such words) include or have a characteristic, that particular component or feature need not include or have that characteristic. Such components or features may optionally be included in some embodiments, or may be excluded.
Embodiments of the present disclosure include systems and methods for providing a reset assembly for use with a limit switch, where the reset assembly includes a simplified structure.
Typical limit switches with reset functionality include a separate reset assembly component attached to the limit switch housing. This attachment forms an interface between the housing and the reset assembly that must be sealed to prevent foreign particles from entering the housing and damaging the device. The separate reset assembly components may include multiple components that are assembled prior to attaching the reset assembly to the housing.
Embodiments of the present disclosure may include a reset assembly configured to be directly attached to a limit switch housing. In addition, the number of parts required for the reset assembly may be reduced. The reset assembly may interact with a reset plunger inside the housing, wherein movement of the reset plunger may control the switching circuitry of the limit switch. Further, the position and orientation of the reset assembly may be maintained by attachment to the housing, allowing easy access by a user to control the reset assembly.
Referring now to fig. 1, an exploded view of a limit switch 100 is shown. The limit switch 100 may include: a housing 102, a lid assembly 104, a contact block assembly 106, a reset assembly 108, and a head assembly 110. The cover assembly 104 may be attached to the housing 102 via screws 105, and may enclose the contact block assembly 106 inside the housing. In some embodiments, the lid assembly 104 may include a user interface 103, such as a screen, a display, and/or buttons.
In the embodiment shown in fig. 1, the reset assembly 108 may include: a reset button 112, a reset shaft 116, and a sealing ring 118. The reset assembly 108 may be mounted into the opening 120 of the head assembly 110. In some embodiments, the limit switch 100 may include a reset plunger 122 located inside the housing 102 and in contact with at least a portion of the head assembly 110. The reset plunger 122 may include one or more cutaways 124 configured to interact with the reset shaft 116 of the reset assembly 108. In addition, the reset plunger 122 may interact with a plunger spring 126 to provide a bias on the reset plunger 122.
When assembled, the reduction assembly 108 may be at least partially located inside the head assembly 110. Limit switch 100 may not include a separate reset housing for reset assembly 108. The reset assembly 108 may be directly attached to the head assembly 110 of the limit switch 100. In some configurations, the reset button 112 may be a raised tab 113 or protrusion that may extend from the head assembly 110 and be easily accessible to a user for movement of the reset button 112.
The head assembly 110 may be attached to the housing 102 via screws 111. The head assembly 110 may include an adjustable rod 130 and an adjustment rod screw 132 configured to attach the adjustable rod 130 to the head assembly 110. The head assembly 110 may also include: a bushing 134, a roller 136 attached to the adjustment rod 130, and a shaft 138 attached to the adjustment rod via the adjustment rod screw 132. The shaft 138 may be configured to move inside the head assembly. The shaft 138 may be configured to contact the reset plunger 122.
The contact block assembly 106 may include a contact plunger 140 configured to interact with the reset plunger 122. The contact block assembly 106 may be secured within the housing and the contact plunger 140 may be in contact with a portion of the reset plunger 122. In some embodiments, the housing 102 and reset assembly 108 described above may be used with any number of head assemblies 110, with the head assembly 110 shown above being one example.
Fig. 2 shows a side view of the assembled limit switch 100 with the reset assembly 108 directly attached to the housing 102. A head assembly 110 and a lid assembly 104 are also attached to the housing 102.
Fig. 3 shows a front view of the assembled limit switch 100 with the reset assembly 108 directly attached to the housing 102. A head assembly 110 and a lid assembly 104 are also attached to the housing 102.
Fig. 4A-4B show cross-sectional views of the assembled limit switch 100 with the reset assembly 108 directly attached to the housing 102. The reset button 112 may be mounted into an opening 120 in the head assembly. The reduction assembly 108 may include a sealing ring 118 that may contact the interior of the opening 120, thereby sealing the opening 120. The sealing ring 118 of the reset assembly 108 may seal the internal components located inside the housing 102 from the external environment.
As described above, a typical limit switch may include a separate housing for reset assembly 108. When a separate reset assembly housing is used, there is an attachment interface between the housing, reset assembly housing, and head assembly. These interfaces may be sealed to prevent particles from the external environment from entering the housing.
In the embodiment shown in fig. 4A-4B, the attachment interface is reduced by incorporating the reduction assembly 108 directly into the head assembly 110. There is an attachment interface between the head assembly 110 and the housing 102. The attachment interface between the reset assembly 108 and the head assembly 110 has been reduced to a smaller opening 120, which opening 120 is sealed by the sealing ring 118 of the reset assembly 108. In addition, the sealing ring 118 may provide a more reliable seal than conventional attachment interfaces.
The reset shaft 116 may be biased toward the interior of the head assembly 110 by a reset spring 117. The reset button 112 may be attached to the head assembly 110 via one or more dowel pins (dowels) 121 configured to fit into openings 119 in the reset button 112. A return spring 117 may bias the top of the return button 112 outward away from the head assembly while a return shaft 116 may be attached to the bottom of the return button 112. Thus, the return spring 117 may bias the return shaft 116 inward toward the return plunger 122. The reset button 112 may be attached to the reset shaft 116 such that when a user pushes the raised tab 113 of the reset button 112, the reset shaft 116 moves away from the interior of the housing 102 against the bias from the reset spring 117.
As shown in fig. 4B, the reset shaft 116 of the reset assembly 108 may interact with a reset plunger 122 located inside the head assembly 110. The reset shaft 116 may be configured to move into one of the cutaways 124 of the reset plunger 122 when the cutaways 124 are aligned with the reset shaft 116. The reset plunger 122 may interact with the shaft 138 of the head assembly 110, and the contact plunger 140 of the contact block assembly 106.
When the limit switch 100 is assembled, there may be a compressive force between the reset plunger 122 and the contact plunger 140 generated by the contact block spring 142. Further, there may be a compressive force generated by the plunger spring 126 between the reset plunger 122 and the shaft 138. The rod 130 (shown above) of the head assembly 110 may be attached to the shaft 138. The shaft 138 may rotate when the adjustment lever 130 is rotated, moved, displaced, or otherwise squeezed as a result of measurements made with the limit switch 100, thereby pushing the reset plunger 122 downward against the bias of the plunger spring 126. Once the reset plunger 122 has moved downward a predetermined length, the reset shaft 116 may align with the notch 124 of the reset plunger 122 and move into the notch 124 due to the bias of the reset spring 117 on the reset button 112, thereby locking the reset plunger 122 against any other vertical movement. The predetermined length of downward movement of the reset plunger 122 may be determined based on the dimensions of the various elements of the limit switch 100, the measurements taken using the limit switch 100, and the application specifics of the limit switch 100. In some embodiments, the predetermined length of movement of the reset plunger 122 may be about 4 millimeters.
The reset plunger 122 may also push the contact plunger 140 downward against the bias of the spring 142 when the rod 130 is moved and the shaft 138 causes the reset plunger 122 to move downward. Movement of the contact plunger 140 may actuate a switch circuit 144 within the contact block assembly 106 from a Normally Open (NO) contact to a Normally Closed (NC) contact. In other words, moving the contact plunger 140 may control the switching circuit 144 to switch from the first position to the second position when the reset plunger 122 moves downward a predetermined amount. Actuation of the switch circuit 144 may initiate another action within the limit switch 100, such as activation of an alarm and/or warning, communication that the switch has been actuated, or another similar action. In some embodiments, movement of the reset plunger 122 may move the switch circuit 144 into contact with the other contact 145, thereby closing the circuit in the contact block assembly 106.
After the reset shaft 116 has been locked with the cutaways 124 of the reset plunger 122, the reset shaft 116 may be released from the cutaways 124 of the reset plunger 122 when the user pushes the reset button 112 via the raised tabs 113. In addition, the lever 130 (and/or other elements of the head assembly 110) may be released and/or returned to an initial position. When the user releases the lever 130 and releases the reset button 112 (and thus the reset shaft 116), the reset plunger 122 and the contact plunger 140 will return to their initial positions due to the bias from the contact block spring 142 and the reset spring plunger spring 126.
Fig. 5 illustrates an exploded view of the reset assembly 108 showing the reset button 112, the reset spring 117, the reset shaft 116, and the sealing ring 118. Further, the positioning pins 121 may be incorporated into the head assembly 110. In some embodiments, the seal ring 118 may be attached to a notch 516 in the reset shaft 116. In some embodiments, the return spring 117 may be pressed against the top 517 of the return button 112. In some embodiments, the reset shaft 116 may be attached to the bottom 512 of the reset button 112.
Embodiments may also include an exemplary assembly process for limit switch 100. A head assembly 110 may be attached to the housing 102, wherein the head assembly includes a shaft 138 extending at least partially from the head assembly 110. The reset shaft 116, seal ring 118, and reset spring 117 may be mounted in an opening 120 of the head assembly 110. The reset button 112 may be attached to a reset shaft 116. As shown in fig. 1-3, the rod 130 (optionally including the roller 136) may be attached to the shaft 138 via a screw 132. The head assembly 110 may or may not include a bushing. The reset button 112 (and all of the reset assembly 108) may be located adjacent to the attachment point between the shaft 138 and the rod 130 in the assembly 110. In some embodiments, most of the reset button 112 (except for the raised tab 113) may be recessed inside the opening 120 of the head assembly. This may prevent accidental movement of the reset assembly 108 by an external source while allowing the user access to the raised tabs 113.
In a first embodiment, the limit switch may comprise: a switch housing; a contact block assembly configured to be mounted inside the switch housing, the contact block assembly including a contact plunger and a switch circuit; a head assembly including a lever, the head assembly configured to attach to a switch housing; a reset plunger configured to be mounted inside the housing, the reset plunger configured to interact with the head assembly and the contact plunger; and a reset assembly including a reset button and a reset shaft, wherein the reset assembly is disposed inside the head assembly, and wherein the reset shaft is configured to interact with the reset plunger, wherein the shaft inside the head assembly moves the reset plunger downward against the bias when the lever is rotated relative to the switch housing, wherein the reset shaft moves into the opening in the reset plunger due to the bias on the reset shaft when the reset plunger is moved downward a predetermined amount, wherein the contact plunger also moves downward against the bias when the reset plunger is moved downward, and wherein the contact plunger is configured to control the switch circuit based on the position of the contact plunger inside the contact block assembly.
A second embodiment may include the limit switch of the first embodiment, wherein the reset button includes one or more openings configured to be secured with one or more locating pins extending from the head assembly.
A third embodiment may include the limit switch of the first or second embodiments, wherein the reset button is configured to rotate about a connection point between the reset button and the head assembly, and wherein pushing on a top portion of the reset button removes the reset shaft from the opening of the reset plunger.
A fourth embodiment may include the limit switch of any of the first to third embodiments, wherein the reset button comprises a raised tab configured to extend over an opening in the head assembly.
A fifth embodiment may include the limit switch of any of the first through fourth embodiments, wherein the reset assembly comprises a seal ring configured to seal with the head assembly.
A sixth embodiment can include the limit switch of any of the first through fifth embodiments, further comprising a cover assembly configured to attach to the switch housing and configured to enclose the contact block assembly within the interior of the switch housing.
A seventh embodiment may include the limit switch of the sixth embodiment, wherein the cover assembly includes a user interface.
An eighth embodiment may include the limit switch of any of the first through seventh embodiments, wherein the switching circuit comprises a normally open/normally closed circuit.
A ninth embodiment may include the limit switch of any of the first through eighth embodiments, further comprising a return spring configured to provide a bias on the return shaft toward the return plunger.
A tenth embodiment may include the limit switch of any of the first through ninth embodiments, further comprising a contact spring configured to provide a bias on the contact plunger toward the return plunger.
An eleventh embodiment can include the limit switch of any of the first through tenth embodiments, further comprising a plunger spring configured to provide a bias on the reset plunger toward the head assembly.
A twelfth embodiment may include the limit switch of any of the first through eleventh embodiments, wherein when the user pushes the reset button, the reset shaft is removed from the opening in the reset plunger, thereby allowing the reset plunger and the contact plunger to move upward due to the bias.
In a thirteenth embodiment, a method for operating a limit switch may comprise: assembling a reset plunger into a shell of the limit switch and between a head assembly of the limit switch and a contact block assembly of the limit switch, wherein the reset plunger interacts with a contact plunger of the contact block assembly; assembling a reset assembly inside the head assembly, wherein the reset assembly interacts with the reset plunger; rotating a shaft of a head assembly to measure physical motion of an object through physical contact between the shaft and the object; the reset plunger moves downwardly against the bias due to rotation of the shaft; the contact plunger moves downwardly against the bias due to the downward movement of the reset plunger; controlling a switching circuit based on movement of a contact plunger; locking the reset plunger in place via interaction between the reset assembly and the reset plunger when the reset plunger is moved downward a predetermined amount; actuating the reset plunger to move upward by moving the reset assembly away from the reset plunger; moving the reset plunger upward based on the bias; moving the contact plunger upward based on the bias voltage; and controlling the switching circuit based on the movement of the contact plunger.
A fourteenth embodiment may include the method of the thirteenth embodiment, wherein locking the reset plunger in place includes moving a reset shaft of the reset assembly into an opening in the reset plunger.
A fifteenth embodiment may include the method of the fourteenth embodiment, wherein moving the reset assembly away from the reset plunger comprises: pushing on the top of a reset button attached to a reset shaft attached to the bottom of the reset button rotates the reset button about a connection point between the reset button and a head assembly, and removing the reset shaft from an opening in a reset plunger.
A sixteenth embodiment can include the method of the fifteenth embodiment, further comprising biasing a top of the reset button away from the head assembly.
A seventeenth embodiment may include the method of any of the thirteenth through sixteenth embodiments, further comprising activating an alert based on the controlling of the switching circuit.
In an eighteenth embodiment, the limit switch may include: a head assembly including a shaft; a housing configured to attach to a head assembly; a contact block assembly configured to be mounted inside the housing, the contact block assembly including a contact plunger and a switching circuit; a reset assembly comprising a reset button, a reset shaft, and a reset spring, wherein the reset assembly is disposed inside the head assembly via a recessed opening in the head assembly; and a reset plunger configured to contact the shaft and the contact plunger, wherein when measured by the limit switch, the shaft rotates relative to the switch housing, thereby moving the reset plunger downward against the bias, wherein when the reset plunger is moved downward a predetermined amount, the reset shaft is moved into the opening in the reset plunger due to the bias on the reset shaft, wherein when the reset plunger is moved downward the contact plunger also moves downward against the bias, wherein the contact plunger is configured to control the switching circuit based on the position of the contact plunger within the contact block assembly, and wherein when a user pushes the reset button, the reset shaft is removed from the opening in the reset plunger, thereby releasing the reset plunger and the contact plunger to move upward due to the bias.
A nineteenth embodiment can include the limit switch of the eighteenth embodiment, wherein the contact block assembly is configured to activate the warning based on control of the switch circuit.
A twentieth embodiment may include the limit switch of the eighteenth or nineteenth embodiment, wherein the reset assembly includes a sealing ring configured to seal with the opening of the head assembly.
While various embodiments in accordance with the principles disclosed herein have been shown and described above, modifications thereof can be made by one skilled in the art without departing from the spirit and teachings of the disclosure. The embodiments described herein are merely representative and are not intended to be limiting. Many variations, combinations, and modifications are possible and are within the scope of the disclosure. It is also within the scope of the disclosure to combine, merge and/or omit features of various embodiments to form alternative embodiments. Accordingly, the scope of protection is not limited by the description set out above, but is only limited by the claims which follow, that scope including all equivalents of the subject matter of the claims. Each claim is incorporated into the specification as a further disclosure, and the claims are examples of the present invention. Moreover, any advantages and features described above may be associated with particular embodiments, but the application of such issued claims should not be limited to processes and structures accomplishing any or all of the above advantages or having any or all of the above features.
Further, some headings are used herein to be consistent with the recommendations under 37 c.f.r. 1.77 or to provide organizational cues in other respects. These headings should not limit or characterize the invention as set forth in any claims that may be entitled to such disclosure. Specifically and by way of example, although these headings may refer to "the technical field," the claims should not be limited by the language chosen under this heading to describe the so-called technical field. Furthermore, the description of technology in the "background" should not be construed as an admission that certain technology is prior art to any invention in this disclosure. The summary of the invention should not be considered a limiting characterization of the invention set forth in the issued claims. Furthermore, any reference in this disclosure to "the invention" in the singular should not be used to infer that there is only a single point of novelty in the present disclosure. Various inventions may be set forth with limitations in the various claims issued from this disclosure, such claims thus defining the invention and equivalents to the invention claimed thereby. In all cases, the scope of the claims should be considered in light of the advantages of the disclosure itself, but should not be limited by the headings set forth herein.
The use of broader terms (e.g., "including," "comprising," and "having") should be understood to provide support for narrower terms (e.g., "consisting of … …," "consisting essentially of … …," and "consisting essentially of … …"). The use of the terms "optionally," "may," "possible," etc. with respect to any element of an embodiment means that the element is not required, or alternatively the element is required, both alternatives being within the scope of the embodiment. In addition, references to examples are provided for illustrative purposes only and are not intended to be exclusive.
While several embodiments have been provided in the present disclosure, it should be understood that the disclosed systems and methods may be embodied in many other specific forms without departing from the spirit or scope of the present disclosure. The present examples are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein. For example, various elements or components may be combined or integrated in another system, or certain features may be omitted, or not implemented.
In addition, techniques, systems, subsystems, and methods described or illustrated in the various embodiments as discrete or separate may be combined or integrated with other systems, modules, techniques, or methods without departing from the scope of the present disclosure. Other items shown or discussed as directly coupled or communicating with each other may be indirectly coupled or communicating through some interface, device, or intermediate component, whether electrically, mechanically, or otherwise. Other examples of changes, substitutions, and alterations are ascertainable by one skilled in the art and could be made without departing from the spirit and scope disclosed herein.
Claims (10)
1. A limit switch (100) comprising:
a switch housing (102);
a contact block assembly (106) configured to be mounted inside the switch housing (102), the contact block assembly including a contact plunger (140) and a switch circuit (144);
a head assembly (110) comprising a lever (130), the head assembly configured to be attached to the switch housing (102);
a reset plunger (122) configured to be mounted inside the switch housing (102), the reset plunger configured to interact with the head assembly (110) and the contact plunger (140); and
a reset assembly (108) including a reset button (112) and a reset shaft (116), wherein the reset assembly (108) is disposed inside the head assembly (110), and wherein the reset shaft (116) is configured to interact with the reset plunger (122),
wherein a shaft (138) inside the head assembly (110) is configured to move the reset plunger (122) downward against a bias when the lever (130) is rotated relative to the switch housing (102),
wherein the reset shaft (116) is configured to move into a slot (124) in the reset plunger (122) due to a bias on the reset shaft (116) when the reset plunger (122) is moved downward a predetermined amount,
Wherein the contact plunger (140) is configured to move downward against a bias when the reset plunger (122) moves downward, and
wherein the contact plunger (140) is configured to control the switch circuit (144) based on a position of the contact plunger (140) within the contact block assembly (106).
2. The limit switch (100) of claim 1, wherein the reset button (112) is configured to rotate about a connection point between the reset button (112) and the head assembly (110), and wherein a top portion of the reset button (112) is configured to remove the reset shaft (116) from the slot (124) of the reset plunger (122) when pushed.
3. The limit switch (100) of claim 1, wherein the reset button (112) comprises a raised tab (113) extending over an opening (120) in the head assembly (110).
4. The limit switch (100) of claim 1, wherein the reset assembly (108) comprises a sealing ring (118) configured to seal with the head assembly (110).
5. The limit switch (100) of claim 1, wherein the switch circuit (144) comprises a normally open/normally closed circuit.
6. The limit switch (100) of claim 1, further comprising a return spring (117) configured to provide a bias on the return shaft (116) toward the return plunger (122).
7. The limit switch (100) of claim 1, wherein the reset shaft (116) is configured to be removed from the slot (124) in the reset plunger (122) and allow the reset plunger (122) and the contact plunger (140) to move upward due to the bias on the reset plunger (122) and the contact plunger (140) when the reset button (112) is pushed.
8. A method for operating a limit switch, comprising:
rotating a shaft of a head assembly of a limit switch to measure physical movement of an object by physical contact between the shaft and the object, wherein a reset plunger is disposed in a housing of the limit switch and between the head assembly of the limit switch and a contact block assembly of the limit switch, wherein the reset plunger interacts with a contact plunger of the contact block assembly, wherein a reset assembly is disposed inside the head assembly, and wherein the reset assembly interacts with the reset plunger;
Moving the reset plunger downward against a bias due to rotation of the shaft;
moving the contact plunger downward against a bias due to downward movement of the reset plunger;
controlling a switching circuit based on movement of the contact plunger;
locking the reset plunger in place via interaction between the reset assembly and the reset plunger when the reset plunger is moved downward a predetermined amount;
actuating the reset plunger to move upward by moving the reset assembly away from the reset plunger;
moving the reset plunger upward based on a bias on the reset plunger;
moving the contact plunger upward based on a bias on the contact plunger; and
controlling the switching circuit based on movement of the contact plunger.
9. The method of claim 8, wherein locking the reset plunger in place comprises moving a reset shaft of the reset assembly into an opening in the reset plunger.
10. The method of claim 9, wherein moving the reset assembly away from the reset plunger comprises: pushing on the top of a reset button attached to the reset shaft, rotating the reset button about a connection point between the reset button and the head assembly, and removing the reset shaft from the opening in the reset plunger, wherein the reset shaft is attached to the bottom of the reset button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710065757.2A CN108400031B (en) | 2017-02-06 | 2017-02-06 | Reset key of limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710065757.2A CN108400031B (en) | 2017-02-06 | 2017-02-06 | Reset key of limit switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108400031A CN108400031A (en) | 2018-08-14 |
| CN108400031B true CN108400031B (en) | 2021-12-21 |
Family
ID=63093903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710065757.2A Active CN108400031B (en) | 2017-02-06 | 2017-02-06 | Reset key of limit switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108400031B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3602681A (en) * | 1970-03-02 | 1971-08-31 | Robertshaw Controls Co | Adjustable actuator arm construction |
| GB1391991A (en) * | 1971-04-21 | 1975-04-23 | Telemecanique Electrique | Actuating device for switchgear |
| JPH08111141A (en) * | 1994-10-13 | 1996-04-30 | Omron Corp | Switch |
| CN1396611A (en) * | 2001-07-10 | 2003-02-12 | 欧姆龙株式会社 | Limit switch |
| CN2749041Y (en) * | 2004-11-09 | 2005-12-28 | 天津市第六电器开关厂 | Non auto-reset limit switch with lock bar |
| JP4110757B2 (en) * | 2001-09-07 | 2008-07-02 | オムロン株式会社 | Limit switch head structure |
| CN102723219A (en) * | 2012-06-20 | 2012-10-10 | 科都电气有限公司 | Kick switch with locking mechanism |
| CN104011820A (en) * | 2012-01-13 | 2014-08-27 | 欧姆龙株式会社 | Limit switch |
| CN104425144A (en) * | 2013-08-30 | 2015-03-18 | 西门子公司 | Testing position control assembly of switching device and switching device |
| CN105742102A (en) * | 2014-12-24 | 2016-07-06 | 欧姆龙株式会社 | Limit switch |
-
2017
- 2017-02-06 CN CN201710065757.2A patent/CN108400031B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3602681A (en) * | 1970-03-02 | 1971-08-31 | Robertshaw Controls Co | Adjustable actuator arm construction |
| GB1391991A (en) * | 1971-04-21 | 1975-04-23 | Telemecanique Electrique | Actuating device for switchgear |
| JPH08111141A (en) * | 1994-10-13 | 1996-04-30 | Omron Corp | Switch |
| CN1396611A (en) * | 2001-07-10 | 2003-02-12 | 欧姆龙株式会社 | Limit switch |
| JP4110757B2 (en) * | 2001-09-07 | 2008-07-02 | オムロン株式会社 | Limit switch head structure |
| CN2749041Y (en) * | 2004-11-09 | 2005-12-28 | 天津市第六电器开关厂 | Non auto-reset limit switch with lock bar |
| CN104011820A (en) * | 2012-01-13 | 2014-08-27 | 欧姆龙株式会社 | Limit switch |
| CN102723219A (en) * | 2012-06-20 | 2012-10-10 | 科都电气有限公司 | Kick switch with locking mechanism |
| CN104425144A (en) * | 2013-08-30 | 2015-03-18 | 西门子公司 | Testing position control assembly of switching device and switching device |
| CN105742102A (en) * | 2014-12-24 | 2016-07-06 | 欧姆龙株式会社 | Limit switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108400031A (en) | 2018-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK2854296T3 (en) | CONTACT LESS BUTTON | |
| US9589741B2 (en) | Pressure-actuated safety switch with monitoring function | |
| CN108063064B (en) | Limit switch shell with reset function | |
| US6444932B1 (en) | Safety switch | |
| US7507922B2 (en) | Hinge with built in safety switch | |
| BR112015003466B1 (en) | compact push-button component | |
| US9136070B2 (en) | High security switch device | |
| US5430267A (en) | Keyboard switch | |
| CN108400031B (en) | Reset key of limit switch | |
| CA2604373A1 (en) | Control unit with a monitoring apparatus | |
| US8816802B2 (en) | Auxiliary tripping device for an electrical switching device and electrical switching device | |
| US20180130615A1 (en) | Momentary structure for mini toggle switch | |
| US9390868B2 (en) | Switch assembly for disconnect operator | |
| US20130270094A1 (en) | Operator control device and operating method | |
| US10199185B2 (en) | Electric switch | |
| JP2019090528A (en) | Safety switch | |
| US9679709B2 (en) | Devices and methods for activating circuit breaker accessories | |
| CN105841107B (en) | End cap of lighting device and lighting device comprising same | |
| US20070295587A1 (en) | Device limit switch with low pre-travel and high overtravel | |
| US7399938B2 (en) | Switch with low pre-travel and high overtravel | |
| US7351924B2 (en) | Key switch with a device for key monitoring | |
| US9691568B2 (en) | Electrical circuit breaker including a trip block | |
| JP4263315B2 (en) | Support stick support structure | |
| US10388471B2 (en) | Actuator having a mechanical signal display | |
| US10290452B2 (en) | Method and apparatus for automatic engagement of arc reduction technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |