# US 5,346,357 A · Self-locking parallel-motion dolly mount

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,346,357 A
- Document ID: US5346357A
- Status: Granted
- Kind: A
- Application number: 08/018,140
- Filed: 1993-02-16
- Granted: 1994-09-13
- Earliest claimed: 1991-09-06
- Inventors: Curtis C. Hassell
- Web page: https://patentgrep.com/patent/US5346357A

## CPC

- B60P 1/4442: {the raising device, when not in use, being stored inside the load-transporting compartment}
- B60P 3/12: for salvaging damaged vehicles
- Y10S 414/126: Handlers with spring devices
- Y10S 414/13: Handlers utilizing parallel links
- B60P: VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS (vehicles with special provisions for transporting patients or disabled persons, or their personal conveyances A61G3/00)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An apparatus for stowing or extending for loading and unloading a towing dolly. The invention comprises a vertical support stand upon which rotate a pair of spaced apart pivot arms connected to a bracket into which is placed the towing dolly. The apparatus utilizes a novel self-locking flange which rotates so as to secure the dolly within the mounting bracket when it is pivoted into the storage position, and rotates so as to release the dolly from the bracket when the device is pivoted into the load/unload position. The apparatus may be secured into the storage position by means of a spring operated latch arm and latch pin. Further, the invention provides a locking lug for locking the towing dolly into the dolly mount to prevent theft of the towing dolly.

## Claims

### Claim 1

A self-locking dolly mount apparatus for storing and removably extending a towing dolly, comprising:
(a) a generally vertical support stand;
(b) a first pivot arm and a second pivot arm, each having a lower end and an upper end, and each pivotally attached at its lower end to said support stand, said first and second pivot arms pivoting between a stowed position and a load/unload position;
(c) a dolly mount bracket pivotally attached to the upper ends of said first and second pivot arms, said dolly mount bracket having an aperture; and
(d) a self-lock flange secured to the upper end of said second pivot arm wherein said self-lock flange pivots to a position in which the flange extends through the aperture so as to secure a towing dolly within said dolly mount bracket when said first and second pivot arms are in the stowed position and wherein said self-lock flange pivots to a position so as to release a towing dolly from within said dolly mount bracket when said first and second pivot arms are in the load/unload position.

### Claim 2 (depends on 1)

A self-locking dolly mount apparatus as recited in claim 1, further comprising a hydraulic spring having a first end and a second end, said first end pivotally attached to said support stand and said second end pivotally attached to said dolly mount bracket.

### Claim 3 (depends on 1)

A self-locking dolly mount apparatus as recited in claim 1, further comprising a latching means for securing the first and second pivot arms in the stowed position.

### Claim 4 (depends on 1)

A self-locking dolly mount apparatus as recited in claim 1, further comprising means for locking a towing dolly to the dolly mount apparatus to prevent theft of the towing dolly.