Bimetal controlled snap disc thermal switch
First Claim
1. In a bimetal controlled snap disc thermal switch for controlling the heating current to an electrical heating member, the switch including:
- a support plate arranged to be in thermal communication with the member;
a bimetal snap disc which rests against the support plate to be in thermal communication therewith and which is formed to undergo a deformation dependent on its temperature;
a switch element supported in the housing and operable for controlling the heating current, the switch element having a fixed contact and a movable contact;
a contact spring carrying the movable contact and mounted for pivotal movement in the direction of the deformation of the snap disc;
a movement transfer member movable in the direction of deformation of the snap disc and interposed between the snap disc and the contact spring for acting on the contact spring with play to pivot the contact spring in a direction to separate the movable contact from the fixed contact in response to a deformation of the snap disc; and
a compression spring bearing against the transfer member for maintaining the transfer member in operative association with the snap disc, the improvement wherein said compression spring is integral with said contact spring and is in the form of a tongue cut out of said contact spring; and
said transfer member has the form of a cylindrical bolt with its axial direction oriented in the direction of deformation of said snap disc, with one end of said bolt being arranged to act on said contact spring and having a diameter which is greater than the width of the opening cut in said contact spring to form said tongue.
1 Assignment
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Accused Products
Abstract
In a bimetal controlled snap disc thermal switch for controlling the heating current to an electrical heating member, the switch including: a support plate arranged to be in thermal communication with the member; a bimetal snap disc which rests against the support plate to be in thermal communication therewith and which is formed to undergo a deformation dependent on its temperature; a switch element supported in the housing and operable for controlling the heating current, the switch element having a fixed contact and a movable contact; a contact spring carrying the movable contact and mounted for pivotal movement in the direction of the deformation of the snap disc; a movement transfer member movable in the direction of deformation of the snap disc and interposed between the snap disc and the contact spring for acting on the contact spring with play to pivot the contact spring in a direction to separate the movable contact from the fixed contact in response to a deformation of the snap disc; and a compression spring bearing against the transfer member for maintaining the transfer member in operative association with the snap disc, the compression spring is made integral with the contact spring and is in the form of a tongue cut out of the contact spring body.
21 Citations
9 Claims
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1. In a bimetal controlled snap disc thermal switch for controlling the heating current to an electrical heating member, the switch including:
- a support plate arranged to be in thermal communication with the member;
a bimetal snap disc which rests against the support plate to be in thermal communication therewith and which is formed to undergo a deformation dependent on its temperature;
a switch element supported in the housing and operable for controlling the heating current, the switch element having a fixed contact and a movable contact;
a contact spring carrying the movable contact and mounted for pivotal movement in the direction of the deformation of the snap disc;
a movement transfer member movable in the direction of deformation of the snap disc and interposed between the snap disc and the contact spring for acting on the contact spring with play to pivot the contact spring in a direction to separate the movable contact from the fixed contact in response to a deformation of the snap disc; and
a compression spring bearing against the transfer member for maintaining the transfer member in operative association with the snap disc, the improvement wherein said compression spring is integral with said contact spring and is in the form of a tongue cut out of said contact spring; and
said transfer member has the form of a cylindrical bolt with its axial direction oriented in the direction of deformation of said snap disc, with one end of said bolt being arranged to act on said contact spring and having a diameter which is greater than the width of the opening cut in said contact spring to form said tongue. - View Dependent Claims (2, 3, 4, 5, 6)
- a support plate arranged to be in thermal communication with the member;
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7. In a bimetal controlled snap disc thermal switch for controlling the heating current to an electrical heating member, the switch including:
- a support plate arranged to be in thermal communication with the member;
a bimetal snap disc which rests against the support plate to be in thermal communication therewith and which is formed to undergo a deformation dependent on its temperature;
a switch element supported in the housing and operable for controlling the heating current, the switch element having a fixed contact and a movable contact;
a contact spring carrying the movable contact and mounted for pivotal movement in the direction of the deformation of the snap disc;
a movement transfer member movable in the direction of deformation of the snap disc and interposed between the snap disc and the contact spring for acting on the contact spring with play to pivot the contact spring in a direction to separate the movable contact from the fixed contact in response to a deformation of the snap disc; and
a compression spring bearing against the transfer member for maintaining the transfer member in operative association with the snap disc, the improvement wherein said compression spring is integral with said contact spring and is in the form of a tongue cut out of said contact spring;
said tongue is bent to be spaced from the plane of said contact spring in the direction toward said transfer member;
said tongue has a portion remote from said one end thereof which is wider than a portion of said tongue adjacent said remote portion; and
said tongue is further formed to cause said wider portion thereof to be pressed against associated parts of said contact spring by said transfer member when said transfer member acts to pivot said contact spring. - View Dependent Claims (8, 9)
- a support plate arranged to be in thermal communication with the member;
Specification