CA2646412A1 - Safety guard mechanism for lifting device - Google Patents

Safety guard mechanism for lifting device Download PDF

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Publication number
CA2646412A1
CA2646412A1 CA 2646412 CA2646412A CA2646412A1 CA 2646412 A1 CA2646412 A1 CA 2646412A1 CA 2646412 CA2646412 CA 2646412 CA 2646412 A CA2646412 A CA 2646412A CA 2646412 A1 CA2646412 A1 CA 2646412A1
Authority
CA
Canada
Prior art keywords
safety guard
lifting device
rotator
slider arm
guard mechanism
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.)
Granted
Application number
CA 2646412
Other languages
French (fr)
Other versions
CA2646412C (en
Inventor
Kan Cui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US12/292,120 external-priority patent/US7950695B2/en
Application filed by Individual filed Critical Individual
Publication of CA2646412A1 publication Critical patent/CA2646412A1/en
Application granted granted Critical
Publication of CA2646412C publication Critical patent/CA2646412C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Landscapes

  • Forklifts And Lifting Vehicles (AREA)
  • Emergency Lowering Means (AREA)

Abstract

The safety guard mechanism for a lifting device is a mechanism that can automatically deploy a safety guard pivotally mounted to the lower surface of the frame of a portable aerial lift device when the lift is raised.
By lowering the guard member, the distance between the lower surface of the base and the ground is decreased. The helical screw-based mechanical device includes a mechanical translator coupled with a rotator, the entire assembly interconnecting the guard member and a scissors-type lift so that raising the lift drives the lowering of the guard member. In the lowered position, the guard prevents tipping of the lift should one or more wheels enter a pothole or other depression. A helical screw latch is included to provide a self-locking feature.

Claims (12)

1. A safety guard mechanism for a lifting device, comprising:
a lifting device having a lifting member including a slidable linkset member, the lifting device having a frame;
an elongated safety guard pivotally attached to the frame of the lifting device, the safety guard being pivotal between a retracted position adjacent the frame and an extended position proximate ground to prevent the lifting device from tipping over;
a rotator body fixed to the safety guard, the rotator body having an elongated channel defined therein, the channel having a helical portion extending over a portion of the length of the rotator body;
a slider arm attached to the slidable linkset member and constrained to slide linearly when the lifting member is raised, the slider arm having a free end; and a roller attached to the free end of the slider arm, the roller being rotatably disposed in the channel;
wherein linear motion of the slider arm when the lifting member is raised pivots the safety guard to the extended position, and linear motion of the slider arm pivots the safety guard to the retracted position when the lifting member is lowered.
2. The safety guard mechanism for a lifting device according to claim 1, further comprising a helical screw latch self-locking the slider arm in the extended and retracted positions.
3. The safety guard mechanism for a lifting device according to claim 1, wherein one-quarter of a helical thread lead distance displacement of the roller through the rotator channel causes a 90° rotation of the rotator body.
4. The safety guard mechanism for a lifting device according to claim 1, wherein the rotator body channel has an approximately 45° entrance angle with respect to the horizontal and vertical body axis planes, and a 135° exit angle with respect to said planes.
5. The safety guard mechanism for a lifting device, according to claim 1, further comprising a spring inside the rotator, the spring biasing the safety guard mechanism in the extended position.
6. The safety guard mechanism for a lifting device according to claim 1, wherein the rotator channel further comprises a straight linear lead-in channel section merging with the beginning of the helical portion of the channel.
7. The safety guard mechanism for a lifting device according to claim 1, wherein the rotator channel further comprises a straight linear lead-out channel section merging with the end of the helical portion of the channel.
8. The safety guard mechanism for a lifting device according to claim 1, further comprising a spring in operable communication with the slider arm, the spring biasing the safety guard locked in the extended position.
9. The safety guard mechanism for a lifting device according to claim 1, further comprising an anti-rotation bracket in operable communication with the slider arm, the anti-rotation bracket constraining rotational movement of the slider arm, thereby imparting maximum rotational torque to the rotator body.
10. The safety guard mechanism for a lifting device according to claim 1, further comprising a cylindrical casing housing the rotator and a rotator engaging translator portion of the slider arm, the rotator-engaging translator portion of the slider arm being coaxially positioned with respect to the rotator.
11. The safety guard mechanism for a lifting device, according to claim 10, further comprising:
opposing helical channels disposed in the rotator body; and translator roller bearings engaging the opposing helical channels, the rotator-engaging translator portion of the slider arm being in operable communication with the translator roller bearings, the slider arm being linked to the slidable linkset member of the lift device, the slidable linkset member driving the translator to cause the rotator body to extend and retract the safety guards.
12. The safety guard mechanism for a lifting device according to claim 11, further comprising a plurality of couplings operably connecting the translator to the slidable linkset member.
CA2646412A 2008-01-03 2008-12-11 Safety guard mechanism for lifting device Expired - Fee Related CA2646412C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US627008P 2008-01-03 2008-01-03
US61/006,270 2008-01-03
US12/292,120 2008-11-12
US12/292,120 US7950695B2 (en) 2008-01-03 2008-11-12 Safety guard mechanism for lifting device

Publications (2)

Publication Number Publication Date
CA2646412A1 true CA2646412A1 (en) 2009-07-03
CA2646412C CA2646412C (en) 2011-09-13

Family

ID=40821880

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2646412A Expired - Fee Related CA2646412C (en) 2008-01-03 2008-12-11 Safety guard mechanism for lifting device

Country Status (1)

Country Link
CA (1) CA2646412C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016170255A1 (en) 2015-04-18 2016-10-27 Haulotte Group Anti-pothole aerial work platform
CN111515909A (en) * 2020-04-29 2020-08-11 南宁学院 Quick overhaul device of electrical control equipment
CN112429681A (en) * 2020-12-06 2021-03-02 济南霸力升降机械有限公司 Electric scissor type lifting platform

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016170255A1 (en) 2015-04-18 2016-10-27 Haulotte Group Anti-pothole aerial work platform
US10676334B2 (en) 2015-04-18 2020-06-09 Haulotte Group Anti-pothole aerial work platform
CN111515909A (en) * 2020-04-29 2020-08-11 南宁学院 Quick overhaul device of electrical control equipment
CN112429681A (en) * 2020-12-06 2021-03-02 济南霸力升降机械有限公司 Electric scissor type lifting platform

Also Published As

Publication number Publication date
CA2646412C (en) 2011-09-13

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20181211

MKLA Lapsed

Effective date: 20181211