US4585356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete mixer truck
Assignee: INGRID HUDELMAIER SYLVANERWEG 19 D-7900 ULM/DONAU (WEST GERMANY)
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Filing: 1984-03-30
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Granted: 1986-04-29
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Expires: 2004-03-30
Abstract
Abstract The invention relates to a concrete mixer truck having a mixer drum adapted to be rotated by the traction motor of the vehicle through an auxiliary transmission of the traction motor transmission. It is an object of the invention to ensure that the power supplied by the traction motor is effectively available for traction purposes under conditions of increased power demand, such as starting and accelerating, and/or that the torque of the mixer drum does not interfere with gear shift operations. To this effect the invention provides a control means adapted to disconnect the mixer drum rotating transmission from the traction motor transmission during predetermined travel conditions, i.e. under conditions defined by an increased power demand for locomotion of the vehicle. Also included in these conditions is each gear shift operation, as at this instance the torque of the mixer drum is prevented from influencing the rotary speed of the speed shift transmission.
Inventors
- 👤 Gerhard Hudelmaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:28
CPC Classifications
B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4206; B28C5/421; B60; B60P; B60P3/00; B60P3/16
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
55 words
A concrete mixer truck having: a mixer drum; a traction motor; transmission means for rotating said drum operably connected to the traction motor; and control means for automatically disconnecting the drum rotating transmission means from the traction motor during predetermined travel conditions which are defined as an increased power demand for travel of the vehicle.
Claim 2
Dependent Claim
55 words
A concrete mixer truck having: a mixer drum; a traction motor; transmission means for rotating said drum operably connected to the traction motor; and control means for automatically disconnecting the drum rotating transmission means from the traction motor during predetermined travel conditions which are defined as an increased power demand for travel of the vehicle.
Claim 3
Dependent Claim
23 words
A concrete mixer truck according to claim 1, wherein said control means is activated in response to the position of an accelerator pedal.
Claim 4
Dependent Claim
25 words
A concrete mixer truck according to claim 2, wherein said control means is activated by means of a limit switch associated with said accelerator pedal.
Claim 5
Dependent Claim
27 words
A concrete mixer truck according to claim 1, wherein said control means is activated by an actuation of a gear shift mechanism associated with said traction motor.
Claim 6
Dependent Claim
25 words
A concrete mixer truck according to claim 1, wherein said control means is activated both by a gear shift actuation and by an accelerator pedal.
Claim 7
Dependent Claim
23 words
A concrete mixer truck according to claim 1, wherein said control means is activated in response to the operating condition of the engine.
Claim 8
Dependent Claim
24 words
A concrete mixer truck according to claim 6, wherein said control means is connected to a pressure sensing element associated with an injection pump.
Claim 9
Dependent Claim
39 words
A concrete mixer truck according to claim 6, wherein said control means is connected to a comparator element for comparing the torque characteristic of said traction motor to a predetermined characteristic through a relay adapted to respond to deviations.
Claim 10
Dependent Claim
32 words
A concrete mixer truck according to claim 1, wherein said control means is activated both by actuation of a gear shift mechanism and in response to the operating condition of said engine.
Claim 11
Dependent Claim
30 words
A concrete mixer truck according to any of claims 6 to 9, wherein a delay relay is disposed in association with sensor elements sensing the operating condition of the engine.
Claim 12
Dependent Claim
83 words
A concrete mixer truck having a mixer drum rotatable by a traction motor of the vehicle through a drum rotating transmission connected to an auxiliary transmission connected to the traction motor transmission, including control means for automatically disconnecting the drum rotating transmission from the traction motor transmission during predetermined travel conditions which are defined as an increased power demand for travel of the vehicle, said control means having associated therewith a timing relay for limiting the disconnection period of said drum rotation transmission.
Claim 13
Dependent Claim
83 words
A concrete mixer truck having a mixer drum rotatable by a traction motor of the vehicle through a drum rotating transmission connected to an auxiliary transmission connected to the traction motor transmission, including control means for automatically disconnecting the drum rotating transmission from the traction motor transmission during predetermined travel conditions which are defined as an increased power demand for travel of the vehicle, said control means having associated therewith a timing relay for limiting the disconnection period of said drum rotation transmission.
Claim 14
Dependent Claim
23 words
A concrete mixer truck according to claim 11, wherein said control means is activated in response to the position of an accelerator pedal.
Claim 15
Dependent Claim
25 words
A concrete mixer truck according to claim 12, wherein said control means is activated by means of a limit switch associated with said accelerator pedal.
Claim 16
Dependent Claim
26 words
A concrete mixer truck according to claim 11, wherein said control means is activated on actuation of a gear shift mechanism associated with said traction motor.
Claim 17
Dependent Claim
24 words
A concrete mixer truck according to claim 11, wherein said control means is activated both by a gear shift and by an accelerator pedal.
Claim 18
Dependent Claim
23 words
A concrete mixer truck according to claim 11, wherein said control means is activated in response to the operating condition of the engine.
Claim 19
Dependent Claim
24 words
A concrete mixer truck according to claim 16, wherein said control means is connected to a pressure sensing element associated with an injection pump.
Claim 20
Dependent Claim
38 words
A concrete mixer truck according to claim 16, wherein said control means is connected to a comparator element for comparing the torque characteristic of said traction motor to a predetermined characteristic through a relay which responds to deviations.
Claim 21
Dependent Claim
32 words
A concrete mixer truck according to claim 11, wherein said control means is activated both by actuation of a gear shift mechanism and in response to the operating condition of said engine.
Claim 22
Dependent Claim
30 words
A concrete mixer truck according to any of claims 16 to 19, wherein a delay relay is disposed in association with sensor elements sensing the operating condition of the engine.
Claim 23
Dependent Claim
28 words
A concrete mixer truck according to claim 1 or 11, including a disconnector clutch actuatable by said control means, disposed between said auxiliary transmission and said mixer drum.
Claim 24
Dependent Claim
18 words
A concrete mixer truck according to claim 21, wherein said disconnector clutch is of the electromechanically operated type.
Claim 25
Dependent Claim
24 words
A concrete mixer truck according to claim 21, wherein said disconnector clutch is of the hydraulically operated type and connected to a solenoid valve.
Claim 26
Dependent Claim
31 words
A concrete mixer truck according to claim 1 or 11, wherein said auxiliary transmission includes a power takeoff shaft associated with a speed change gear transmission of the traction motor transmission.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |