US3786999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety mechanism to prevent shaft coupling when blades are exposed in a blender
Assignee: Ronson Corp
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Filing: 1972-01-11
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Granted: 1974-01-22
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Expires: 1992-01-11
Abstract
Abstract A safety mechanism to insure that a blender jar is properly mounted over the high speed comminuting blades of a blender to prevent exposure of the blades when they are revolving. The jar must be inserted on a base member properly and twisted to a locked position to enable the base, which has a portion of the driven blade shaft in it, to be connected to the drive shaft of the blender.
Inventors
- 👤 D Cabell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:31
CPC Classifications
A; A47; A47J; A47J43/00; A47J43/04; A47J43/07; A47J43/08; A47J43/085; A47J43/046; A47J43/075; A47J43/0761; A47J43/0766; A47J43/0772; A47J43/0777
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
217 words
In a blender, a protective mechanism comprising, a. a housing enclosing a motor and a drive shaft extending outwardly of said motor to be driven thereby, b. a base member which is separable from said housing, c. a driven shaft extending through said base member, a food comminuting means coupled to said driven shaft, and said driven shaft arranged to be coupled to and driven by said drive shaft, d. means on said base member for receiving and retaining thereon a removable jar which completely covers said comminuting means, e. an interference means on said base member which in normal position precludes attachment of said drive shaft to said driven shaft and permits coupling of said drive shaft and said driven shaft only when said jar is properly placed and locked on said base member so as to cover said comminuting means, f. said interference means on said base member comprises a fixed member and a movable member movable relative to said fixed member so that in the normal position said movable member is out of alignment with said fixed member and said movable member can be moved selectively from the normal position relative to said fixed member into alignment with said fixed member so that coupling of said drive and said driven shaft can be attained.
Claim 2
Dependent Claim
217 words
In a blender, a protective mechanism comprising, a. a housing enclosing a motor and a drive shaft extending outwardly of said motor to be driven thereby, b. a base member which is separable from said housing, c. a driven shaft extending through said base member, a food comminuting means coupled to said driven shaft, and said driven shaft arranged to be coupled to and driven by said drive shaft, d. means on said base member for receiving and retaining thereon a removable jar which completely covers said comminuting means, e. an interference means on said base member which in normal position precludes attachment of said drive shaft to said driven shaft and permits coupling of said drive shaft and said driven shaft only when said jar is properly placed and locked on said base member so as to cover said comminuting means, f. said interference means on said base member comprises a fixed member and a movable member movable relative to said fixed member so that in the normal position said movable member is out of alignment with said fixed member and said movable member can be moved selectively from the normal position relative to said fixed member into alignment with said fixed member so that coupling of said drive and said driven shaft can be attained.
Claim 3
Dependent Claim
39 words
In a blender as defined in claim 1 in which said housing has a releasable latching means thereon to selectively secure and release the base and jar thereon when said jar is properly placed and locked on said base.
Claim 4
Dependent Claim
26 words
In a blender as defined in claim 1 in which the housing is formed with a socket therein, and the drive shaft extends into said socket.
Claim 5
Dependent Claim
29 words
In a blender as defined in claim 3 in which the base member is shaped and sized to correspond with and to fit into said socket on the housing.
Claim 6
Dependent Claim
38 words
In a blender as defined in claim 1 in which a spring has one end secured to said fixed member and the other end secured to said movable member to bias said movable member into the normal position.
Claim 7
Dependent Claim
75 words
In a blender as defined in claim 1 in which the base member comprises walls forming a depending skirt having cutout portions therein and the fixed member includes interference members which extend beyond the walls forming the depending skirt and interrupt the contour of the skirt walls the in normal position, and the interference members align with the walls forming the depending skirt when the jar is properly placed and locked on the base member.
Claim 8
Dependent Claim
29 words
In a blender as defined in claim 1 in which the jar has at least one flange thereon which is securely held by a lip on said base member.
Claim 9
Dependent Claim
61 words
In a blender as defined in claim 7 in which the base member includes a portion having at least one notch therein, in which at least one flange on said jar extends therein, whereupon rotational movement of said jar causes the flange on the jar to exert pressure against the edge forming the notch to thereby correspondingly rotate the base member.
Claim 10
Dependent Claim
61 words
In a blender as defined in claim 7 further comprising a ring member having at least one notch therein spaced axially above the notch in the base member and at least one lip extending inwardly of said ring adjacent said notch which overlies the flange on the jar upon rotation of said jar and locks the jar on said base member.
Claim 11
Dependent Claim
17 words
In a blender as defined in claim 9 further comprising a handle secured to said ring member.
Claim 12
Dependent Claim
31 words
In a blender as defined in claim 1 in which said interference means includes a resilient member located within said base member for biasing said movable member into the normal position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |